O conhecimento do professor de matemática e a integração das tecnologias na sua prática - Botelho, M. C.; Rocha, H. (Atas do Encontro de Investigação em Educação Matemática, 2022)

O conhecimento profissional do professor de matemática na integração de diferentes tecnologias - Botelho, M. C.; Rocha, H. (Atas do XXXII Seminário de Investigação em Educação Matemática, 2022)

O conhecimento profissional do professor e a interdisciplinaridade em contexto de integração com a tecnologia - Coelho, T; Rocha, H. (XXXII Seminário de Investigação em Educação Matemática, 2022)

O desenvolvimento curricular e a formação de professores - Rocha, H.; Costa, M.C.; Jacinto, H. (Atas do Encontro de Investigação em Educação Matemática, 2022)

Peak Detection and HRV Feature Evaluation on ECG and PPG Signals - Esgalhado, Filipa; Arnaldo Batista; Vassilenko, Valentina; Russo, Sara; Ortigueira, Manuel (2022)

Pre-service teachers’ knowledge and the use of different technologies to teach Mathematics - Rocha, H. (Perspectives and Trends in Education and Technology, 2022)
Teachers are central to the choice of tasks proposed to the students. And the teachers’ knowledge is one of the important elements guiding these choices. Despite the different models that conceptualize the teachers’ knowledge to integrate technology in their practices, research has focused essentially on the integration of a single technology. Little is known about how the work with different technologies can contribute to promote the development of the professional knowledge of pre-service teachers (PTs) or how the use of different technologies mobilizes different domains of the PTs’ knowledge. The main goal of this study is to deepen the understanding about the relation between the PTs’ Knowledge for Teaching Mathematics with Technology (KTMT) and their choice of tasks. The study adopts a qualitative and in-terpretative methodology based on one case study. The main conclusions suggest a strong impact of the PTs’ Learning and Teaching Technology Knowledge (a knowledge related to the impact of technology on the teaching and learning process) and a not so strong impact of their Mathematical and Technological Knowledge (a knowledge related to the impact of technology on the mathematical knowledge). The conclusions also point to the potential of the work with different technologies to deepen the PTs reflections and analysis of tasks.

A Preliminary Exploration of the Placental Position Influence on Uterine Electromyography Using Fractional Modelling - Mufit Şan; Arnaldo Batista; Russo, Sara; Esgalhado, Filipa; Catarina Palma Reis; Serrano, Fátima; Ortigueira, Manuel (2022)

Rethinking digital technology versus paper and pencil in 3D Geometry - Viseu, F.; Rocha, H.; Monteiro, J. (Journal of Learning for Development, 2022)
Recognising the relevance of learning Geometry, and in particular 3D Geometry, this study aims to discuss the contributions that digital technology and paper and pencil approaches can bring to students’ learning. We seek, therefore, to identify the differences between the two approaches, and specifically: What factors are relevant in one and the other approach? What does one approach facilitate over the other? A quantitative and a qualitative and interpretive methodology was adopted, and based on a didactic intervention, the students' resolutions of the proposed tasks were analysed. The results obtained show that the experience and prior knowledge of the students with each of the solids involved seems to be decisive in the approach with paper and pencil. However, technology emerges as an enhancing resource when prior knowledge is more fragile. The study also shows differences between the representations supported by the two resources, suggesting the mobilisation of different knowledge by the students in relation to each of the resources.

STE(A)M approach: Distinguishing and discussing meanings - P. Teixeira; C. Martins; Rocha, H. (EduLearn, 2022)
The STE(A)M approach has been recognized by several authors for its potential in assisting teaching and learning, and several curriculum standards already value its application in the classroom. This approach is based on the articulation between different areas, the clarification, and the deepening of the concepts being studied. Although there are different approaches, according to the fields involved, STEM and STEAM are two among the most often mentioned in the literature. STEM is based on learning that integrates the following areas of knowledge: Science, Technology, Engineering, and Mathematics. The conceptualization of the STE(A)M approach is not consensual and uniform. There are different models focusing on problem-solving based learning, project-based-learning, design-based learning, and engineering models. Still, different authors present different conceptualizations of this approach. In this paper, we relied on the existing literature to discuss the different understandings of the STE(A)M approach. We will also pay attention to mathematics and how different authors see the disciplines’ role within a STE(A)M approach and discuss the evolution of the mentioned authors’ positions throughout time. Thus, methodologically, we undertook the following steps: (i) literature search based on the selected keywords; (ii) selection of the texts, considering the authors and time gap, in order to analyze the evolution of the research and (iii) collection and organization of the relevant topics for the study. This study aims to present the meanings, conceptualizations, and possible influences present in different models and for understand the evolution of the STEM and STEAM approaches over time. The main findings suggest a focus on the interdisciplinary or transdisciplinary approach as opposed to the primeval years of investigations in STEM and STEAM when many authors advocated a multidisciplinary approach. This change in thinking is due to the need to train students in an integral and holistic manner, developing citizens with transversal knowledge and skills prepared for the current societal challenges.

Taxonomy, chronology, and dispersal patterns of Western European Quaternary hippopotamuses: New insight from Portuguese fossil material - Roberta Martino; Maria Ibanez Ríos; Octavio Mateus; Luca Pandolfi (Quaternary International, 2022)
The taxonomy, chronology and dispersal patterns of hippopotamuses in Western Europe are still a matter of debate, despite the long history of researchers on these topics. In this framework, the Portuguese material has never been investigated or recently revised, and it can contribute to increasing our comprehension about Quaternary hippopotamuses. The material considered in this work, collected from sites dated between 1 Ma and 0.13 Ma, is compared with fossil Pleistocene hippopotamuses from the Iberian Peninsula, Italy, Germany and Greece, in order to contribute into the discussion on evolutionary and dispersal patterns of these large semi-aquatic mammals in Europe during the Pleistocene. Portugal deposits recorded the presence of H. antiquus, starting from 1 Ma up to 0.4 Ma, and H. cf. amphibius during the late Middle Pleistocene. In particular, the occurrence of H. antiquus in Condeixa, dated around 0.4 Ma, can be considered as the LAD of this species in Europe. The paleobiogeography and dispersal patterns of European hippopotamuses are further discussed.
n/a
Keywords: Biochronology; Hippopotamidae; morphology; Morphometry; paleobiogeography

Behavior of flat slabs with partial use of high-performance fiber reinforced concrete under monotonic vertical loading - Isufi, Brisid; Relvas, João Pedro; Marchão, Carla; Ramos, António Pinho (Engineering Structures, 2022)
n/a
Cited by: 4; All Open Access, Green Open Access, Hybrid Gold Open Access

Enrichment analysis on regulatory subspaces: a novel direction for the superior description of cellular responses to SARS-CoV-2 - Rodrigues, Pedro; Costa, Rafael S; Henriques, Rui (Computers in Biology and Medicine, 2022)
n/a
n/a

EXPERIMENTAL INVESTIGATION ON THE BEHAVIOUR OF HYBRID HPFRC FLAT SLABS - Isufi, Brisid; Marchão, Carla; Marreiros, Rui; Ramos, António Pinho (fib Symposium, 2022)
n/a
Cited by: 0

Finite Difference Schemes with Non-uniform Time Meshes for Distributed-Order Diffusion Equations - M. L. Morgado; M. Rebelo; Ferrás, L. L. (Proceedings of the International Conference on Fractional Differentiation and its Applications (ICFDA’21), 2022)
n/a
n/a

Flat Plate Building and Frame Full Scale Tests for European Design Provisions - Coronelli, Dario; Muttoni, Aurelio; Pascu, Radu; Ramos, Antonio (American Concrete Institute, ACI Special Publication, 2022)
n/a
Cited by: 0

A general deep hybrid model for bioreactor systems: Combining first principles with deep neural networks - Pinto, José; Mestre, Mykaella; Ramos, J; Costa, Rafael S; Striedner, Gerald; Oliveira, Rui (Computers & Chemical Engineering, 2022)
n/a
n/a

HYBRID USE OF HPFRC IN SLAB – COLUMN CONNECTIONS UNDER CYCLIC LATERAL LOADING - Ramos, António Pinho; Isufi, Brisid; Marreiros, Rui; Marchão, Carla (fib Symposium, 2022)
n/a
Cited by: 0

Identities and bases in the hypoplactic monoid - Cain, Alan J.; Malheiro, António; Duarte Ribeiro (Communications in Algebra, 2022)
n/a
n/a

An insight on the firing condition of Chinese blue-and-white porcelain through XANES - Coutinho, Mathilda Larsson; Veiga, João Pedro; Ruivo, Andreia; Pena, Teresa; Colera, Eduardo Salas; Lima, Augusta; Figueiredo, Elin; Cotte, Marine; Lima, Margarida; others (Journal of Analytical Atomic Spectrometry, 2022)
n/a
n/a

Modeling and optimization of bioreactor processes - Pinto, José; Antunes, João; Ramos, João; Costa, Rafael S; Oliveira, Rui (Current Developments in Biotechnology and Bioengineering, 2022)
n/a
n/a

New insights into the hippopotamid (Mammalia, Hippopotamidae) from the Casino Basin (Tuscany, Italy) - Martino, R.; Ríos, M.; O. Mateus; Rook, L.; Pandolf, L. (XIX Annual conference of the European Association of Vertebrate Palaeontologists (19th EAVP)At: Benevento, Italy, 2022)
n/a
n/a

Nonlinear analysis of flat slab-column connections to optimize the use of HPFRC under monotonic vertical loading - Díaz, Rafael Sanabria; Isufi, Brisid; Trautwein, Leandro Mouta; Ramos, António Pinho (Structural Concrete, 2022)
n/a
Cited by: 0

Photonic-Structured Perovskite Solar Cells: Detailed Optoelectronic Analysis - Haque, Sirazul; Alexandre, Miguel; Baretzky, Clemens; Rossi, Daniele; De Rossi, Francesca; Vicente, António T; Brunetti, Francesca; Águas, Hugo; Ferreira, Rute A. S.; Fortunato, Elvira; Auf der Maur, Matthias; Würfel, Uli; et al. (ACS Photonics, 2022)
n/a
n/a

Post-earthquake Performance of a Slab-Column Connection with Punching Shear Reinforcement - Isufi, Brisid; Ramos, António Pinho; Válter Lúcio (Journal of Earthquake Engineering, 2022)
n/a
Cited by: 8; All Open Access, Green Open Access

Rational use of HPFRC in slab – column connections under reversed horizontal cyclic loading - António Ramos; Isufi, Brisid; Marreiros, Rui; Bolešová, Mária; Gajdošová, Katarina (Engineering Structures, 2022)
n/a
Cited by: 1; All Open Access, Green Open Access, Hybrid Gold Open Access

Slab–column connection punching and ductility improvement methods for seismic response of buildings with flat slabs - Isufi, Brisid; Almeida, André; Marreiros, Rui; Ramos, António Pinho; Válter Lúcio (Structural Concrete, 2022)
n/a
Cited by: 0

A spectral approach to non-linear weakly singular fractional integro-differential equations - Faghih, Amin; Magda Rebelo (Fractional Calculus and Applied Analysis, 2022)
n/a
n/a

STRENGTHENING OF FLAT SLABS WITH FIBRE REINFORCED POLYMERS USING THE EXTERNALLY BONDED REINFORCEMENT ON GROOVES METHOD: A REVIEW - Ala Torabian; Isufi, Brisid; Davood Mostofinejad; Ramos, António Pinho (REHABEND, 2022)
n/a
Cited by: 0

Synergy between silk fibroin and ionic liquids for active gas-sensing materials - Inês P. Moreira; Esteves, Carina; Palma, Susana I.C.J.; Ramou, Efthymia; Ana L.M. Carvalho; Roque, Ana C. A. (Materials Today Bio, 2022)
Silk fibroin is a biobased material with excellent biocompatibility and mechanical properties, but its use in bioelectronics is hampered by the difficult dissolution and low intrinsic conductivity. Some ionic liquids are known to dissolve fibroin but removed after fibroin processing. However, ionic liquids and fibroin can cooperatively give rise to functional materials, and there are untapped opportunities in this combination. The dissolution of fibroin, followed by gelation, in designer ionic liquids from the imidazolium chloride family with varied alkyl chain lengths (2–10 carbons) is shown here. The alkyl chain length of the anion has a large impact on fibroin secondary structure which adopts unconventional arrangements, yielding robust gels with distinct hierarchical organization. Furthermore, and due to their remarkable air-stability and ionic conductivity, fibroin ionogels are exploited as active electrical gas sensors in an electronic nose revealing the unravelled possibilities of fibroin in soft and flexible electronics.
n/a
Keywords: Bioelectronics; gas sensing; Ionic conductivity; ionic liquids; Physical ionogels; Silk fibroin

Tin and Bronze Production at the Outeiro de Baltar Hillfort (NW Iberia) - Figueiredo, Elin; Rodrigues, Alexandra; Fonte, João; Meunier, Emmanuelle; Dias, Filipa; Lima, Alexandre; Gonçalves, José Alberto; Gonçalves-Seco, Luís; Gonçalves, Filipe; Pereira, Manuel F. C.; Silva, Rui JC; Veiga, João P (Minerals, 2022)
Findings of Iron Age metallurgical activities related to tin metal and mining are very rare. In the present work, we present a detailed study of the Outeiro de Baltar hillfort, dated to the Late Iron Age/Early Roman period, located in a place where 20th century tin mining work took place. Elemental and microstructural analysis by portable, micro and wavelength dispersive X-ray fluorescence spectrometry (pXRF, micro-XRF and WDXRF) and scanning electron microscopy with energy dispersion spectrometer (SEM-EDS) showed that metallurgical debris found at the archaeological site is related to tin smelting and binary and ternary bronze productions. Analysis of the artefacts of diverse typologies found at the site showed that a variety of metals and alloys were in circulation and use. Samples of tin ores (cassiterite) from the region were analyzed for comparison with an archaeological tin slag from the site. The analytical results point to the production of tin metal using local cassiterite and the production of bronze by directly adding cassiterite into a smelting process. Furthermore, data of remote sensing (airborne Light Detection and Ranging (LiDAR) and historical aerial imagery) and Geographical Information System (GIS) mapping were combined with archival mining documentation and maps to retrieve a landscape context for the site. The study showed that the place of the Outeiro de Baltar hillfort (NW Iberia) was mined periodically over time.
n/a

{Isotopic cross sections of fragmentation residues produced by light projectiles on carbon near $400A$ MeV} - Boillos, J M; Cortina-Gil, D; Benlliure, J; Rodr{\'ıguez-Sánchez, J L; Alvarez-Pol, H; Atar, L; Aumann, T; Avdeichikov, V V; Beceiro-Novo, S; Bemmerer, D.; Bertulani, C A; Boretzky, K; et al. (American Physical Society, 2022)
Phys. Rev. C 105, 014611 (2022). doi:10.1103/PhysRevC.105.014611
n/a

{Tackling Humidity with Designer Ionic Liquid-Based Gas Sensing Soft Materials} - Esteves, Carina; Palma, Susana I.C.J.; Costa, Henrique M.A.; Alves, Cláudia; Santos, Gonçalo M.C.; Ramou, Efthymia; Carvalho, Ana Luísa; Alves, Vitor; Roque, Ana C. A. (Advanced Materials, 2022)
Relative humidity is simultaneously a sensing target and a contaminant in gas and volatile organic compound (VOC) sensing systems, where strategies to control humidity interference are required. An unmet challenge is the creation of gas-sensitive materials where the response to humidity is controlled by the material itself. Here, humidity effects are controlled through the design of gelatin formulations in ionic liquids without and with liquid crystals as electrical and optical sensors, respectively. In this design, the anions [DCA]− and [Cl]− of room temperature ionic liquids from the 1-butyl-3-methylimidazolium family tailor the response to humidity and, subsequently, sensing of VOCs in dry and humid conditions. Due to the combined effect of the materials formulations and sensing mechanisms, changing the anion from [DCA]− to the much more hygroscopic [Cl]−, leads to stronger electrical responses and much weaker optical responses to humidity. Thus, either humidity sensors or humidity-tolerant VOC sensors that do not require sample preconditioning or signal processing to correct humidity impact are obtained. With the wide spread of 3D- and 4D-printing and intelligent devices, the monitoring and tuning of humidity in sustainable biobased materials offers excellent opportunities in e-nose sensing arrays and wearable devices compatible with operation at room conditions.
n/a

{Porous ZnO Nanostructures Synthesized by Microwave Hydrothermal Method for Energy Harvesting Applications} - Henriques Ferreira, Sofia; Rovisco, Ana; dos Santos, Andreia; Águas, Hugo; Igreja, Rui; Barquinha, Pedro; Fortunato, Elvira; Martins, Rodrigo (Nanopores, 2021)
Abstract Long-haul travel does not constitute an obstacle for tourists to travel and is fast gaining the attention of tourists in new and unique experiences. This study was conducted to identify the long-haul travel motivation by international tourists to Penang. A total of 400 respondents participated in this survey, conducted around the tourist attractions in Penang, using cluster random sampling. However, only 370 questionnaires were only used for this research. Data were analysed using SPSS software 22 version. The findings, ‘knowledge and novelty seeking' were the main push factors that drove long-haul travel by international tourists to Penang. Meanwhile, the main pull factor that attracts long- haul travel by international tourists to Penang was its ‘culture and history'. Additionally, there were partly direct and significant relationships between socio-demographic, trip characteristics and travel motivation (push factors and pull factors). Overall, this study identified the long-haul travel motivations by international tourists to Penang based on socio-demographic, trip characteristics and travel motivation and has indirectly helped in understanding the long-haul travel market particularly for Penang and Southeast Asia. This research also suggested for an effective marketing and promotion strategy in pro- viding useful information that is the key to attract international tourists to travel long distances. Keywords:
n/a
Keywords: tourism

{High UV and Sunlight Photocatalytic Performance of Porous ZnO Nanostructures Synthesized by a Facile and Fast Microwave Hydrothermal Method} - Ferreira, Sofia Henriques; Morais, Maria; Nunes, Daniela; Oliveira, Maria João; Rovisco, Ana; Pimentel, Ana; Águas, Hugo; Fortunato, Elvira; Martins, Rodrigo (Materials, 2021)
The degradation of organic pollutants in wastewaters assisted by oxide semiconductor nanostructures has been the focus of many research groups over the last decades, along with the synthesis of these nanomaterials by simple, eco-friendly, fast, and cost-effective processes. In this work, porous zinc oxide (ZnO) nanostructures were successfully synthesized via a microwave hydrothermal process. A layered zinc hydroxide carbonate (LZHC) precursor was obtained after 15 min of synthesis and submitted to different calcination temperatures to convert it into porous ZnO nanostructures. The influence of the calcination temperature (300, 500, and 700 °C) on the morphological, structural, and optical properties of the ZnO nanostructureswas investigated. All ZnO samples were tested as photocatalysts in the degradation of rhodamine B (RhB) under UV irradiation and natural sunlight. All samples showed enhanced photocatalytic activity under both light sources, with RhB being practically degraded within 60 min in both situations. The porous ZnO obtained at 700 °C showed the greatest photocatalytic activity due to its high crystallinity, with a degradation rate of 0.091 and 0.084 min−1 for UV light and sunlight, respectively. These results are a very important step towards the use of oxide semiconductors in the degradation of water pollutants mediated by natural sunlight.
n/a
Keywords: hydrothermal synthesis; mi-crowave; porous nanostructures; sunlight photocatalysis; zinc hydroxide carbonate; ZnO

{Microwave-Assisted Hydrothermal Synthesis of Zn2SnO4 Nanostructures for Photocatalytic Dye Degradation} - Rovisco, Ana; Branquinho, Rita; Martins, Rodrigo; Fortunato, Elvira; Barquinha, Pedro (Materials Proceedings, 2021)
Zinc-tin oxide (ZTO) nanostructures appear as one of the most promising material systems for a new generation of nanodevices. In this work, a microwave-assisted hydrothermal synthesis to produce different shapes of Zn2SnO4 nanostructures (nanoparticles, octahedrons and nanoplates) is presented. Reproducible and homogeneous results were obtained with the advantage of reducing up to 20 h the synthesis time when compared to using a conventional oven. Furthermore, the photocatalytic activity of the Zn2SnO4 nanostructures in the degradation of rhodamine B under UV light was studied. Zn2SnO4 nanoparticles demonstrated better performance with >90% of degradation being achieved in 2.5 h.
n/a
Keywords: mal synthesis; microwave-assisted hydrother-; nanoparticles; nanoplates; octahedrons; Photocatalysis; rhodamine b; zn 2 sno 4; zto

How is labour organised in Portuguese digital platforms?. - Nuno Boavida; António Brandão Moniz; Naumann, R.; Roque, Isabel (Final International Conference of the Project Crowdwork: Platform work – Finding new strategies to organize in Europe, 2021)

Case studies on digital labour platforms in Portugal: 2nd National Report of Project Crowdwork - Nuno Boavida; António B. Moniz; Reinhard Naumann; Roque, Isabel; Raquel Azevedo (CICS.NOVA, 2021)
The so called “crowd work” is an employment form that uses a digital platform to enable organisations or individuals to access other organisations or individuals to solve specific problems or to provide specific services in exchange for payment (Valenduc and Vendramin, 2016). There are many alternative terms for crowd work used in European member states, such as crowd sourcing, crowd employment, sharing economy, platform economy, gig economy, on-demand economy, collaborative economy, Peer-to-peer economy, among others (Eurofound 2018). Recently, the term “digital platform work” has developed recently to be dominant in the literature to refer to sectors where this technology has arrived. Accordingly, this report will proceed using the latter term. These forms of online intermediation have expanded from creative and high-skilled professional activities that became virtualised as a result of digitalisation to a variety of other services and activities, traditionally delivered by self-employed, that involve the maintenance or repair of material commodities or the delivery of services in person, such as cleaning, gardening, household maintenance and transport (Huws, 2017). As a result of this, workers profiles vary from highly skilled IT and creative professionals to very unskilled workers. It has been also noted that many digital platform workers are young people looking for extra income such as students, unemployed or carers (Valenduc and Vendramin, 2016). The main Portuguese reference about work in digital platforms is fused with the Uber app. Its controversial arrival in 2014 triggered fierce responses from several groups. The main legislative reference on digital platform work is the ‘Uber law’. The symbolism of the app expressed as ‘Uberization’ became synonymous of the ‘new’ precariat, seen as a hassle of technology and an attack to organized labour in the country. There are also regulations for Airbnb at state, regional and municipal level intended to limit the number of lodgings in certain areas where touristic activities are very intense. In general, the other platforms are not covered by specific regulations.

{Optimization of ZnO Nanorods Concentration in a Micro-Structured Polymeric Composite for Nanogenerators} - dos Santos, Andreia; Sabino, Filipe; Rovisco, Ana; Barquinha, Pedro; Águas, Hugo; Fortunato, Elvira; Martins, Rodrigo; Igreja, Rui (Chemosensors, 2021)
The growing use of wearable devices has been stimulating research efforts in the development of energy harvesters as more portable and practical energy sources alternatives. The field of piezoelectric nanogenerators (PENGs) and triboelectric nanogenerators (TENGs), especially employing zinc oxide (ZnO) nanowires (NWs), has greatly flourished in recent years. Despite its modest piezoelectric coefficient, ZnO is very attractive due to its sustainable raw materials and the facility to obtain distinct morphologies, which increases its multifunctionality. The integration of ZnO nanostructures into polymeric matrices to overcome their fragility has already been proven to be fruitful, nevertheless, their concentration in the composite should be optimized to maximize the harvesters' output, an aspect that has not been properly addressed. This work studies a composite with variable concentrations of ZnO nanorods (NRs), grown by microwave radiation assisted hydrothermal synthesis, and polydimethylsiloxane (PDMS). With a 25 wt % ZnO NRs concentration in a composite that was further micro-structured through laser engraving for output enhancement, a nanogenerator (NG) was fabricated with an output of 6 V at a pushing force of 2.3 N. The energy generated by the NG could be stored and later employed to power small electronic devices, ultimately illustrating its potential as an energy harvesting device.
n/a
Keywords: energy harvesting; micro-structuring; microwave assisted hydrothermal; nanogenerators; PDMS; synthesis; ZnO nanorods

{Shape Effect of Zinc-Tin Oxide Nanostructures on Photodegradation of Methylene Blue and Rhodamine B under UV and Visible Light} - Rovisco, Ana; Branquinho, Rita; Deuermeier, Jonas; Freire, Tomás; Fortunato, Elvira; Martins, Rodrigo; Barquinha, Pedro (ACS Applied Nano Materials, 2021)
n/a
n/a

Cultura Material, Cultura Científica: Património Industrial para o Futuro - Alison Wain; Diogo Castro; Rollo, Maria Fernanda; Frederico Nogueira; Gonçalo Santos; Filipe, Maria da Graça; Tissot, Isabel; Sampaio, Jorge Miguel; Santos, José Paulo; Manuel Lemos; Marta Manso; Matthias Tissot; et al. (Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2021)
Material, Culture, Scientific Culture: Industrial Heritage for the Future
IH4Future (PTDC/FIS-aQM/30292/2017

Characterising the Agriculture 4.0 Landscape—Emerging Trends, Challenges and Opportunities - Sara Oleiro Araújo; Ricardo Silva Peres; Barata, José; Fernando Lidon; RAMALHO, JOSÉ COCHICHO (Agronomy, 2021)
n/a
n/a

{Towards Sustainable Crossbar Artificial Synapses with Zinc-Tin Oxide} - Silva, Carlos; Jorge Martins; Deuermeier, Jonas; Pereira, Maria Elias; Rovisco, Ana; Barquinha, Pedro; João Goes; Martins, Rodrigo; Fortunato, Elvira; Kiazadeh, Asal (Electronic Materials, 2021)
In this article, characterization of fully patterned zinc-tin oxide (ZTO)-based memristive devices with feature sizes as small as 25 µm2 is presented. The devices are patterned via lift-off with a platinum bottom contact and a gold-titanium top contact. An on/off ratio of more than two orders of magnitude is obtained without the need for electroforming processes. Set operation is a current controlled process, whereas the reset is voltage dependent. The temperature dependency of the electrical characteristics reveals a bulk-dominated conduction mechanism for high resistance states. However, the charge transport at low resistance state is consistent with Schottky emission. Synaptic properties such as potentiation and depression cycles, with progressive increases and decreases in the conductance value under 50 successive pulses, are shown. This validates the potential use of ZTO memristive devices for a sustainable and energy-efficient brain-inspired deep neural network computation.
n/a
Keywords: amorphous oxide; memristor; physical mechanism; resistive switching device; zto

Digital work platforms – The diversity of collective representation in Portugal - Nuno Boavida; António Brandão Moniz; Reinhard Naumann; Raquel Azevedo; Roque, Isabel; Yuliya Kuznetsova; Peliz, Marina (Working on Platforms – Fighting for Labour and Social Rights, 2021)

A distributed order viscoelastic model for small deformations - Ferrás, L.; M. L. Morgado; M. Rebelo (SYMCOMP 2021, 2021)

Design and engineering of magneto-responsive devices for cancer theranostics: Nano to macro perspective - Soares, Paula I. P.; Romao, Joana; Matos, Ricardo; Silva, Jorge Carvalho; Borges, Joao Paulo (Pergamon, 2021)
n/a
n/a

In situ electrochemical characterization of a microbial fuel cell biocathode running on wastewater - Ramanaiah, S.V.; Cordas, C. M.; Matias, S.; Fonseca, L. P. (Catalysts, 2021)
n/a
Export Date: 22 September 2021

Case studies on digital labour platforms in Portugal: Final National Report of Project CrowdWork - Nuno Boavida; António Brandão Moniz; Reinhard Naumann; Roque, Isabel; Raquel Azevedo (CICS.NOVA, 2021)
This report is the 3rd and final report elaborated for the project CrowdWork by the Portuguese team. The text provides the context in which digital platforms operate, as well as the main governmental initiatives in some of the sectors. Five case studies provide a description of each sector and an analysis of the existing / emerging collective organisations, their promotors, rationale and extension. In the last chapter, the text presents our main conclusions and recommendations for policy making.
This work was financed by the European Commission through DG Employment Employment, Social Affairs & Inclusion (Ref. VS/2019/0086) and was partially funded by Portuguese national funds through FCT - Foundation for Science and Technology, I.P., within the scope of the project «UIDB/04647/2020» of CICS.NOVA – Interdisciplinary Centre of Social Sciences. The authors wish to express their gratitude to the colleagues Dr. Yuliya Kuznetsova and Mrs. Marina Peliz that helpfully participated in the fieldwork and enriched our weekly research meetings that contributed to this report.

Alvarez waves in pregnancy: a comprehensive review - Sara, Russo; Arnaldo Batista; Esgalhado, Filipa; dos Reis, Catarina R. Palma; Serrano, Fátima; Vassilenko, Valentina; Ortigueira, Manuel (Biophysical Reviews, 2021)

The Application of Deep Learning Algorithms for PPG Signal Processing and Classification - Esgalhado, Filipa; Fernandes; Beatriz; Vassilenko, Valentina; Batista; Arnaldo; Russo, Sara (Computers 2021. Special Issue Computing, Electrical and Industrial Systems, 2021)

As características do jogo e o conhecimento profissional do professor: que pontos de contacto? - Coelho, T; Rocha, H. (XVI Congresso Internacional Galego-Portugués de Psicopedagogia, 2021)
For most teachers, the use of games is not a common practice. This limited professional experience forces the teacher to reflect on the use of games, on how to integrate them into class work, and on how to enhance the development of learning based on them. Our objective is to analyse a set of game scenarios and study aspects that characterise each of them, relating these characteristics to aspects of the professional knowledge to teach with technology. The study adopts an interpretative and qualitative methodology that seeks to understand the relationship between teachers' choices and their professional knowledge. The main findings suggest that the different characteristics of the game scenarios imply the creation of different working environments in the classroom; enhance the emergence of different student difficulties, requiring different ways to support their work; allowing/promoting different conceptual approaches; and the work with different representations. These differences between the game scenarios point to different emphases on the teaching and learning knowledge and the chemistry knowledge, suggesting different mobilizations of the teacher's professional knowledge.

Conceptualizações do conhecimento do professor para a integração da tecnologia no ensino da matemática - Botelho, M. C.; Rocha, H. (XVI Congresso Internacional Galego-Portugués de Psicopedagogia, 2021)
The potential of technology for teaching and learning mathematics has been widely recognized. However, research has shown that the integration of technology into teaching practice has proved to be difficult, with teachers' knowledge and professional development being identified as a determinant factor. Although there tends to be a focus on the teacher's knowledge of technology, the literature suggests that attention needs to be given to how to integrate technology into teaching practice, thereby involving other types of knowledge. This awareness has led several authors, inspired by Shulman's work, to develop models or conceptualizations of the knowledge required for effective integration of technology. This study is based on a literature review of the research conducted on the models TPACK - Technological Pedagogical and Content Knowledge, KTMT - Knowledge for Teaching Mathematics with Technology, and PTK/MPTK - Mathematical Pedagogical Technology Knowledge and aims to carry out an analysis of the similarities and differences between the models considered. The main conclusions reached suggest the existence of a common basis for the models considered, but also point to several differences between them, with some highlighting the role of technology and its impact on the teaching and learning process, while others aim to integrate into the model elements based on research on technology or theories related to technology integration, such as instrumental genesis.

The contractiongram: A method for the visualization of uterine contraction evolution using the electrohysterogram - Arnaldo G. Batista; Ricardo Cebola; Esgalhado, Filipa; Russo, Sara; dos Reis, Catarina R. Palma; Serrano, Fátima; Vassilenko, Valentina; Ortigueira, Manuel (Biomedical Signal Processing and Control, 2021)

Eccentric punching strength of continuous flat slabs—Analysis of different experimental setups - Lorenzo Secci; Lapi, Massimo; Emanuele Teoni; Ramos, Antonio Pinho; Orlando, Maurizio (Structural Concrete, 2021)
Abstract This paper analyses the performance of the experimental setups to assess the punching strength of slab-column connections in continuous flat slabs under vertical and horizontal loading. In the last years, several experimental campaigns have been performed to investigate the punching strength of slab-column connections, but most of the experimental tests concerned isolated slab-column connections. Among the few setups aimed at reproducing the eccentric punching failure in continuous flat slabs, the setup developed at the NOVA School of Science and Technology in Lisbon is considered in this paper. The performance of the Lisbon setup is assessed through nonlinear finite element analyses, calibrated on experimental data, by comparison with numerical results of a theoretical continuous setup. Then, the performance of the isolated setups, used in many researches and at the base of some international codes, is also evaluated through the same finite element model. Numerical analyses highlight that the setup developed in Lisbon could provide reliable ultimate rotations of continuous flat slab connections, but it underestimates the punching strength. Despite isolated setups lead to similar results when compared with the Lisbon setup, the latter seems to provide a better representation of a continuous slab-column connection. The numerical analyses presented in this paper have been performed assuming monotonic lateral loading.
n/a
Keywords: continuous flat slabs; experimental setups; punching of flat slabs

Evidence of sedimentary remodel of Jurassic theropod egg clutches (Lourinhã, Portugal) - Ezquerro, Lope; Balauz, Blanca; Coimbra, Rute; Nuñez-Lahuerta, Carmen; Mateus,Octávio; Román, Teresa; Moreno-Azanza, Miguel (18th Conference of the EAVP-Abstract book, 2021)
n/a
n/a

From classroom teaching to distance learning: the experience of Portuguese mathematics teachers - Rocha, H.; Palhares, P.; M. Botelho (INTED - 15th annual International Technology, Education and Development Conference, 2021)

History of the discovery of the ankylosaur Dracopelta zbyszewskii (Upper Jurassic), with new data about the type specimen and its locality - Russo, J.; O. Mateus (Comunicações Geológicas, 2021)

Mathematical knowledge for teaching with technology: episodes of one teacher’s practice - Conhecimento matemático para ensinar com tecnologia: episódios da prática de uma professora - Rocha, H. (Educação Matemática Debate, 2021)
Research has highlighted the potential of technology to transform the teaching of Mathematics, but also the relevance of teachers and their professional knowledge. In this article, a qualitative methodology is adopted and two episodes of the practice of one teacher are analyzed in the scope of the study of functions in the 10th grade, based on the model of Knowledge for Teaching Mathematics with Technology (KTMT). The goal is to characterize the teacher's knowledge from her practice, simultaneously understanding how this contributes to promoting the development of the teacher's knowledge. The conclusions reached show the importance of including in the KTMT conception aspects highlighted by the research on technology integration. These aspects are determinant to characterize the teacher's knowledge. They also show the relevance of the practice for the development of the teacher's knowledge and the dynamic character of the vision of knowledge offered by KTMT.

A possible phytosaurian (Archosauria, Pseudosuchia) coprolite from the Late Triassic Fleming Fjord Group of Jameson Land, central East Greenland - Milàn, J.; O. Mateus; Mau, M.; Rudra, A.; Sanei, H.; L. B. Clemmensen (Bulletin of the Geological Society of Denmark, 2021)
A large, well-preserved vertebrate coprolite was found in a lacustrine sediment in the Malmros Klint Formation of the Late Triassic Fleming Fjord Group in the Jameson Land Basin, central East Greenland. The size and internal and external morphology of the coprolite is consistent with that of crocodilian coprolites and one end of the coprolite exhibits evidence of post-egestion trampling. As the associated vertebrate fauna of the Fleming Fjord Group contains abundant remains of pseudosuchian phytosaurs, the coprolite is interpreted as being from a large phytosaur.

Professional development for the integration of technology in the teaching of Mathematics: in search of pragmatic theories - Desenvolvimento profissional para a integração da tecnologia no ensino da Matemática: em busca de teorias pragmáticas - Rocha, H.; Faggiano, E.; Sacristan, A.; Santacruz-Rodríguez, M. (XXXI Seminário de Investigação em Educação Matemática, 2021)
This paper presents part of a study that aimed to make more explicit the pragmatic theories that inform the design of professional development programs with an emphasis on the integration of digital technologies in the practices of mathematics teachers. The analysis carried out was based on a set of projects considered representative and implemented in four countries – Colombia, Italy, Mexico and Portugal. Based on this analysis, we identify relevant elements (e.g., similarities and differences, barriers and opportunities) and develop recommendations to be taken into account in the design of future professional development programs. In this process, we identified a set of aspects and sub-aspects, as well as several interconnections between them, which emerged in relation to five main themes and allowed us to reveal our pragmatic theories. Thus, this work provides a framework to support the design of future projects for the professional development of mathematics teachers regarding the use of digital technology.

Re-evaluation of the Holotype of Draconyx loureiroi (Dinosauria, Ornithopoda) with report of new holotype material - Filippo Maria Rotatori; Moreno-Azanza, Miguel; Mateus,Octávio (PALEODAYS 2021 – XXI Convegno della Società Paleontologica Italiana, 2021)
n/a
n/a

A study on mixed electro-osmotic/pressure-driven microchannel flows of a generalised Phan-Thien–Tanner fluid - Ribau, A. M.; Ferrás, L. L.; M. L. Morgado; M. Rebelo; M. A. Alves; F. T. Pinho; Afonso, A. M. (Journal of Engineering Mathematics, 2021)

A systematic overview of medium and large-sized iguanodontians (Dinosauria, Ornithopoda) from the Upper Jurassic Lourinhã Formation, Portugal - Filippo Maria Rotatori; Bruno Camilo Silva; Moreno-Azanza, Miguel; Mateus,Octávio (XIX Encontro de Jovens Investigadores em Paleontologia, 2021)
n/a
n/a

Teachers’ knowledge for teaching Mathematics with technology: an analysis of different frameworks - Rocha, H.; M. Botelho (INTED - 15th annual International Technology, Education and Development Conference, 2021)
Teacher education is central to promote the development of the professional knowledge of teachers, and to help them achieve an appropriate integration of digital technologies, an issue that has proved to be a difficult one. Several authors refer difficulties in the integration of the technology, emphasizing the central role played by the teachers’ knowledge in classroom use. In this paper we discuss three models (TPACK – Technological Pedagogical and Content Knowledge, KTMT – Knowledge for Teaching Mathematics with Technology, PTK / MPTK - Mathematical Pedagogical Technology Knowledge), intending to identify the main contributions of each model to a deeper understanding of how to promote the teachers’ integration of technology in the teaching of Mathematics. The study is based on a literature review and on an analysis of the similarities and differences among the models and its use. On this analysis we identify common influences among the models as well as influences from other research areas. The main conclusions achieved point to a common base to all the models considered, but also to several differences among them, being that some of the models emphasize the role of technology and its impact on Mathematics learning, but others go further, intending to integrate in the model elements based on the research on technology or even other theories such as the one on instrumental genesis.

A tecnologia na formação inicial de professores de Matemática – um olhar sobre duas realidades - Rocha, H.; Palha, S. (Formação de professores e tecnologias digitais, 2021)
Perante as conhecidas dificuldades em alcançar uma adequada integração da tecnologia no processo de ensino e aprendizagem da Matemática, este estudo pretende, apoiando-se na formação ao nível da tecnologia ministrada em duas instituições europeias, identificar aspetos com potencial para promover a formação inicial, no âmbito da tecnologia, de professores de Matemática. Adota-se uma metodologia de índole qualitativa e interpretativa, sendo os dados recolhidos de natureza documental ou relativos a trabalhos de análise e reflexão crítica realizados por dois futuros professores (um de cada instituição). As principais conclusões alcançadas apontam para grandes diferenças entre os contextos de formação, com uma das instituições a valorizar de forma mais significativa a formação na área. Ainda assim, os futuros professores de ambas as instituições mostram alguma tendência para escolher tarefas onde a exploração que é feita da tecnologia fica aquém do seu potencial, onde o recurso ao papel e lápis está sempre presente, e onde a reflexão em torno das características das tarefas e da sua implementação parece ser algo superficial. Apesar da complexidade do processo de integração da tecnologia nas práticas, os aspetos referidos parecem-nos ser dignos de atenção em qualquer programa de formação inicial de professores de Matemática.

Towards pragmatic theories to underpin the design of teacher professional development concerning technology use in school mathematics - Faggiano, E.; Rocha, H.; Sacristan, A.; Santacruz-Rodríguez, M. (Mathematics Education in the Digital Age: Learning, Practice and Theory, 2021)
This chapter aims to make more explicit the grounded or ‘pragmatic theories’ that inform the design of mathematics teachers’ professional development (PD) to exploit technological affordances. It uses aspects of some representative projects that took place in four countries (Colombia, Italy, Mexico, and Portugal) to illustrate lessons learned (e.g., similarities and differences, barriers and opportunities) and provide important insights to inform future PD implementations. To do this, we have identified a set of aspects (and sub-aspects) that emerged in relation to five major themes and reveal our ‘pragmatic theories’ alongside a consideration of the interconnections between these aspects. Our contribution offers a methodological frame to support future PD designs for teachers of mathematics concerning digital technology uses.

Eccentric punching strength of rc slab-column connections: A parametric numerical analysis based on the lisbon setup - Emanuele Teoni; Lorenzo Secci; Lapi, Massimo; Ramos, Antonio Pinho; Orlando, Maurizio (fib Symposium, 2021)
n/a
Cited by: 0

Effect of Bathocuproine Concentration on the Photovoltaic Performance of NiOx-Based Perovskite Solar Cells - Alishah, H.M.; Choi, F.P.G.; Menda, U.D.; Kahveci, C.; Rodop, M.C.; Mendes, MJ; Gunes, S. (Journal of the Mexican Chemical Society, 2021)
n/a
cited By 3

Flat slab structural response for seismic european design. Full scale testing results - Coronelli, Dario; Martinelli, Luca; Muttoni, Aurelio; Pascu, Radu; Ramos, Antonio (fib Symposium, 2021)
n/a
Cited by: 0

Flat slab structural response for seismic european design. Full scale testing results - Coronelli, Dario; Martinelli, Luca; Muttoni, Aurelio; Pascu, Radu; Ramos, Antonio (fib Symposium, 2021)
n/a
Cited by: 0

High-performance wide bandgap perovskite solar cells fabricated in ambient high-humidity conditions - Menda, U.D.; Ribeiro, G.; Nunes, D.; Calmeiro, T; Águas, H.; Fortunato, E.; Martins, R.; Mendes, MJ (Materials Advances, 2021)
n/a
cited By 0

Historical Outline of Iron Mining and Production in the Area of Present-Day Poland - Wrona, Paweł; Różański, Zenon; Pach, Grzegorz; Niewiadomski, Adam P; Veiga, João Pedro (Minerals, 2021)
n/a
n/a

Influence of flexural reinforcement on the seismic performance of flat slab – Column connections - Isufi, Brisid; Rossi, Mariana; Ramos, António Pinho (Engineering Structures, 2021)
n/a
Cited by: 6

Low velocity impact response of 3D printed structures formed by cellular metamaterials and stiffening plates: PLA vs. PETg - F.A. Santos; Rebelo, H.; M. Coutinho; L.S. Sutherland; C. Cismasiu; I. Farina; F. Fraternali (Composite Structures, 2021)
n/a
cited By 9

Magnetic particles used in a new approach for designed protein crystallization - Raquel dos Santos; Romão, Maria João; Ana Cecília A. Roque; Carvalho, Ana Luísa (CrystEngComm, 2021)
After more than one hundred and thirty thousand protein structures determined by X-ray crystallography{,} the challenge of protein crystallization for 3D structure determination remains. In the quest for additives for efficient protein crystallization{,} inorganic materials emerge as an alternative. Magnetic particles (MPs) are versatile inorganic materials{,} easy to use{,} modify and manipulate in a wide range of biological assays. The potential of using functionalised MPs as crystallization chaperones for protein crystallization was shown in this work. MPs with distinct coatings were rationally designed to promote protein crystallization by affinity-triggered heterogeneous nucleation. Hen egg white lysozyme (HEWL) and trypsin{,} were crystallized in the presence of MPs either bare or coated with a polysaccharide (chitin) or a protein (casein){,} respectively. The addition of MPs was characterized in terms of bound protein to the MPs{,} crystal morphology{,} time-lapse of crystal emergence{,} crystallization yield fold change and crystal diffraction quality for structure determination. The MPs additives have shown to bind to the respective target protein{,} and to promote nucleation and crystal growth without compromising crystal morphology. On the other hand{,} MPs addition led to faster detectable crystal emergence and up to 13 times higher crystallization yield{,} addressing some the challenges in protein crystallization{,} the main bottleneck of macromolecular crystallography. Structure determination of the protein crystallized in the presence of MPs revealed that the structural characteristics of the protein remained unchanged{,} as shown by the superposition with PDB annotated proteins. Moreover{,} and unlike most reported cases{,} it was possible to exclude the inhibitor benzamidine during trypsin crystallisation{,} which is a remarkable result opening new prospects in enzyme engineering and drug design. Our results show that MPs coated with affinity ligands to target proteins can be used as controlled and tailor-made crystallization inducers.
n/a

Protein Crystallization in a Microfluidic Contactor with Nafion®117 Membranes - Polino, M.; Rho, H. S.; Pina, M. P.; Mallada, R.; Carvalho, AL; Romão, MJ; Coelhoso, Isabel; Gardeniers, J. G. E.; Crespo, J. G.; Portugal, Carla A. M. (Membranes, 2021)
Protein crystallization still remains mostly an empirical science, as the production of crystals with the required quality for X-ray analysis is dependent on the intensive screening of the best protein crystallization and crystal’s derivatization conditions. Herein, this demanding step was addressed by the development of a high-throughput and low-budget microfluidic platform consisting of an ion exchange membrane (117 Nafion® membrane) sandwiched between a channel layer (stripping phase compartment) and a wells layer (feed phase compartment) forming 75 independent micro-contactors. This microfluidic device allows for a simultaneous and independent screening of multiple protein crystallization and crystal derivatization conditions, using Hen Egg White Lysozyme (HEWL) as the model protein and Hg2+ as the derivatizing agent. This microdevice offers well-regulated crystallization and subsequent crystal derivatization processes based on the controlled transport of water and ions provided by the 117 Nafion® membrane. Diffusion coefficients of water and the derivatizing agent (Hg2+) were evaluated, showing the positive influence of the protein drop volume on the number of crystals and crystal size. This microfluidic system allowed for crystals with good structural stability and high X-ray diffraction quality and, thus, it is regarded as an efficient tool that may contribute to the enhancement of the proteins’ crystals structural resolution.
n/a

A review of tests on slab-column connections with advanced concrete materials - Isufi, Brisid; Ramos, António Pinho (Structures, 2021)
Advances in concrete technology during the last decades have resulted in the development of materials with enhanced mechanical properties, such as High Strength Concrete (HSC), Fibre Reinforced Concrete (FRC) and Ultra-High Performance Fibre Reinforced Concrete (UHPFRC). The application of these materials in flat slabs, which are a popular structural solution in Reinforced Concrete (RC) buildings worldwide, has the potential of significantly reducing raw material consumption by enabling the design of slenderer and therefore lighter structures. However, flat slabs are susceptible to punching shear failure, which is a complex phenomenon that remains challenging, even though significant efforts have been made to experimentally study it. For advanced concrete materials (HSC, FRC and UHPFRC), the challenge is further accentuated by the continuous and rapid development of these materials. With the purpose of identifying and highlighting gaps in the published literature, a review of tests with HSC, FRC and UHPFRC slab-column connections in non-seismic and seismic loading applications is presented in this paper. It is shown that future research directions in this field include, among others, testing thicker slabs, HSC slabs with higher concrete compressive strength, HSC combined with FRC and several more cases related to seismic loading conditions.
n/a
Keywords: Cyclic loading; Fibres; Flat plate; Flat slab; FRC; HSC; Monotonic loading; Punching; UHPFRC

Robustness assessment of a deterministically designed sacrificial cladding for structural protection - H. B. Rebelo; C. Cismasiu (Engineering Structures, 2021)
Being able to efficiently mitigate the effects of blast loads on structures, sacrificial cladding solutions are increasingly used to protect structural elements from the effects of accidental explosions and/or terrorist attacks. The present study analyses the loss of effectiveness of a deterministically designed sacrificial cladding when variability in the material properties and uncertainties in the mechanical model are considered. The results of an experimental campaign are used to validate the numerical models that allow the deterministic design of a sacrificial cladding which successfully improves the blast resistant capabilities of a given structural element. Nonetheless, it is shown that, taking into account the probabilistic variability of key parameters is of vital importance when designing sacrificial cladding solutions, since, when not properly designed for the structural element it intends to protect, adding a sacrificial cladding might negatively impact its blast resistant capabilities. Additionally, it is concluded that the deterministic approach might be against safety. In the reported case study, when comparing the admissible charge weight yielding from the deterministic and probabilistic approaches, one verifies that the former allows a higher charge weight.
n/a
Keywords: Blast load; Probabilistic variability; Robustness assessment; Sacrificial cladding

Seismic behavior of slab-column connections with varying flexural reinforcement ratio - Rossi, Mariana; Isufi, Brisid; Ramos, António Pinho (fib Symposium, 2021)
n/a
Cited by: 0

Seismic behaviour of slab-column connections with various punching shear enhancement methods - Isufi, Brisid; Marreiros, Rui; Ramos, António Pinho; Válter Lúcio (fib Symposium, 2021)
n/a
Cited by: 0

Shear and flexural strengthening of deficient flat slabs with post-installed bolts and CFRP composites bonded through EBR and EBROG - Ala Torabian; Isufi, Brisid; Davood Mostofinejad; Ramos, António Pinho (Structural Concrete, 2021)
Abstract Fiber reinforced polymer (FRP) composites can be efficient for flexural strengthening of flat slabs if debonding of the FRP is postponed. However, with the increase of the flexural capacity, the flat slab becomes more susceptible to punching shear failure. In this context, four flexural or simultaneous flexural and punching shear retrofitting systems are investigated in this study to strengthen a flexure-deficient flat slab. Externally Bonded Reinforcement on Grooves (EBROG) and externally bonded reinforcement (EBR) methods are used for flexural strengthening in two cases: slabs without punching shear reinforcement and with post-installed shear bolts as shear reinforcement. According to the results, flexural strengthening of the slab using the EBR and EBROG techniques increased its load capacity by 12% and 21%, respectively. Simultaneous flexural and shear strengthening of the slab using the EBROG technique was the most effective, leading to a 57% enhancement of the load capacity. For specimens whose failure was governed by punching, comparing the results with code predictions showed that Eurocode and ACI (and the respective guide documents fib bulletin 90 and ACI 440.2R) overestimated the capacity of these specimens. In cases where failure was governed by flexure, a simple application of the yield line theory predicted reasonably well the load capacity of the specimens.
n/a
Keywords: Debonding; EBR; EBROG; Flat slab; FRP composite; post-installed shear bolts; punching shear failure

Stable and convergent finite difference schemes on nonuniformtime meshes for distributed-order diffusion equations - Morgado, M Lu{\'ısa; Magda Rebelo; Ferrás, Lu{\'ıs L (Mathematics, 2021)
n/a
n/a

Testing of a full-scale flat slab building for gravity and lateral loads - Coronelli, Dario; Lamperti Tornaghi, Marco; Martinelli, Luca; Molina, Francisco-Javier; Muttoni, Aurelio; Pascu, Ion Radu; Pegon, Pierre; Peroni, Marco; Ramos, António Pinho; Tsionis, Georgios; Netti, Teresa (Engineering Structures, 2021)
n/a
Cited by: 10; All Open Access, Hybrid Gold Open Access

Towards Sustainable Crossbar Artificial Synapses with Zinc-Tin Oxide - Silva, Carlos; Jorge Martins; Deuermeier, Jonas; Pereira, Maria Elias; Rovisco, Ana; Barquinha, Pedro; João Goes; Martins, Rodrigo; Fortunato, Elvira; Kiazadeh, Asal (Electronic Materials, 2021)
n/a
n/a

{NeuLAND: The high-resolution neutron time-of-flight spectrometer for R3B at FAIR} - Boretzky, K; Gasparic, I; Heil, M; Mayer, J; Heinz, A; Caesar, C; Kresan, D; Simon, H; Törnqvist, H T; Körper, D; Alkhazov, G; Atar, L; et al. (Nuclear Inst. and Methods in Physics Research, A, 2021)
Nuclear Inst. and Methods in Physics Research, A, 1014 (2021) 165701. doi:10.1016/j.nima.2021.165701
n/a

{The SOUL family of heme-binding proteins: Structure and function 15 years later} - Goodfellow, Brian J.; Freire, Filipe; Carvalho, Ana Luísa; Aveiro, Susana S.; Charbonnier, Peggy; Moulis, Jean-Marc; Delgado, Leonildo; Ferreira, Gloria C; Rodrigues, João E; Poussin-Courmontagne, Pierre; Birck, Catherine; McEwen, Alastair; et al. (Coordination Chemistry Reviews, 2021)
The SOUL, or heme-binding protein HBP/SOUL, family represents a group of evolutionary conserved putative heme-binding proteins that contains a number of members in animal, plant andbacterial species. The structures of the murine form of HEBP1, or p22HBP, and the human form of HEBP2, or SOUL, have been determined in 2006 and 2011 respectively. In this work we discuss the structures of HEBP1 and HEBP2 in light of new X-ray data for heme bound murine HEBP1. The interaction between tetrapyrroles and HEBP1, initially proven to be hydrophobic in nature, was thought to also involve electrostatic interactions between heme propionate groups and positively charged amino acid side chains. However, the new X-ray structure, and results from murine HEBP1 variants and human HEBP1, confirm the hydrophobic nature of the heme-HEBP1 interaction, resulting in Kd values in the low nanomolar range, and rules out any electrostatic stabilization. Results from NMR relaxation time measurements for human HEBP1 describe a rigid globular protein with no change in motional regime upon heme binding. X-ray structures deposited in the PDB for human HEBP2 are very similar to each other and to the new heme-bound murine HEBP1 X-ray structure (backbone rmsd ca. 1 Å). Results from a HSQC spectrum centred on the histidine side chain N$δ$-proton region for HEBP2 confirm that HEBP2 does not bind heme via H42 as no chemical shift differences were observed upon heme addition for backbone NH and N$δ$ protons. A survey of the functions attributed to HEBP1 and HEBP2 over the last 20 years span a wide range of cellular pathways. Interestingly, many of them are specific to higher eukaryotes, particularly mammals and a potential link between heme release under oxidative stress and human HEBP1 is also examined using recent data. However, at the present moment, trying to relate function to the involvement of heme or tetrapyrrole binding, specifically, makes little sense with our current biological knowledge and can only be applied to HEBP1, as HEBP2 does not interact with heme. We suggest that it may not be justified to call this very small family of proteins, heme-binding proteins. The family may be more correctly called “the SOUL family of proteins related to cellular fate” as, even though only HEBP1 binds heme tightly, both proteins may be involved in cell survival and/or proliferation.
n/a
Keywords: Function; HEBP1; HEBP2; NMR spectroscopy; SOUL protein; Structure; X-ray crystallography

{Probing the Z=6 spin-orbit shell gap with (p,2p) quasi-free scattering reactions} - Syndikus, I; Petri, M; Macchiavelli, A O; Paschalis, S; Bertulani, C A; Aumann, T; Alvarez-Pol, H; Atar, L; Beceiro-Novo, S; Benlliure, J; Boillos, J M; Boretzky, K; et al. (Physics Letters B, 2020)
Physics Letters B, 809 (2020) 135748. 10.1016/j.physletb.2020.135748
n/a

Observation of strong two-electron–one-photon transitions in few-electron ions - M. Togawa; S. KÃ¼hn; C. Shah; P Amaro; R. SteinbrÃ¼gge; J. Stierhof; N. Hell; M. Rosner; K. Fujii; M. Bissinger; R. Ballhausen; M. Hoesch; et al. (Physical Review A, 2020)
n/a
n/a

Structure of K$\upalpha$1,2- and K$\upbeta$1,3-emission x-ray spectra for Se, Y, and Zr - Ito, Y; Tochio, T; Yamashita, M; Fukushima, S; Vlaicu, A M; J. P. Marques; Sampaio, J M; M Guerra; J P Santos; Syrocki, Ł; Słabkowska, K; E. WÈ©der; et al. (Physical Review A, 2020)
n/a
n/a

Tantalum/Silicon multicomponent oxides for TFTs and synaptic devices - Jorge Martins; Kiazadeh, Asal; Rovisco, Ana; Pinto, Joana V.; Deuermeier, Jonas; Fortunato, Elvira; Martins, Rodrigo; Barquinha, Pedro (2020)
n/a
n/a

Molecular basis for the preferential recognition of beta 1,3-1,4-glucans by the family 11 carbohydrate-binding module from Clostridium thermocellum. - Ribeiro, Diana O.; Viegas, Aldino; Pires, Virgínia M R; Medeiros-Silva, João; Bule, Pedro; Chai, Wengang; Marcelo, Filipa; Fontes, Carlos M. G. A.; Cabrita, Eurico J.; Palma, Angelina S.; Carvalho, Ana Luísa (The FEBS journal, 2020)
Understanding the specific molecular interactions between proteins and $β$1,3-1,4-mixed-linked d-glucans is fundamental to harvest the full biological and biotechnological potential of these carbohydrates and of proteins that specifically recognize them. The family 11 carbohydrate-binding module from Clostridium thermocellum (CtCBM11) is known for its binding preference for $β$1,3-1,4-mixed-linked over $β$1,4-linked glucans. Despite the growing industrial interest of this protein for the biotransformation of lignocellulosic biomass, the molecular determinants of its ligand specificity are not well defined. In this report, a combined approach of methodologies was used to unravel, at a molecular level, the ligand recognition of CtCBM11. The analysis of the interaction by carbohydrate microarrays and NMR and the crystal structures of CtCBM11 bound to $β$1,3-1,4-linked glucose oligosaccharides showed that both the chain length and the position of the $β$1,3-linkage are important for recognition, and identified the tetrasaccharide Glc$β$1,4Glc$β$1,4Glc$β$1,3Glc sequence as a minimum epitope required for binding. The structural data, along with site-directed mutagenesis and ITC studies, demonstrated the specificity of CtCBM11 for the twisted conformation of $β$1,3-1,4-mixed-linked glucans. This is mediated by a conformation-selection mechanism of the ligand in the binding cleft through CH-$π$ stacking and a hydrogen bonding network, which is dependent not only on ligand chain length, but also on the presence of a $β$1,3-linkage at the reducing end and at specific positions along the $β$1,4-linked glucan chain. The understanding of the detailed mechanism by which CtCBM11 can distinguish between linear and mixed-linked $β$-glucans strengthens its exploitation for the design of new biomolecules with improved capabilities and applications in health and agriculture. DATABASE: Structural data are available in the Protein Data Bank under the accession codes 6R3M and 6R31.
n/a

Ta2O5/SiO2 Multicomponent Dielectrics for Amorphous Oxide TFTs - Jorge Martins; Kiazadeh, Asal; Pinto, \{Joana V.\}; Rovisco, Ana; Tiago Gonçalves; Deuermeier, Jonas; Alves, Eduardo; Martins, Rodrigo; Fortunato, Elvira; Barquinha, Pedro (Electronic Materials, 2020)
Co-sputtering of SiO2 and high-κ Ta2O5 was used to make multicomponent gate dielectric stacks for In-Ga-Zn-O thin-film transistors (IGZO TFTs) under an overall low thermal budget (T = 150 °C). Characterization of the multicomponent layers and of the TFTs working characteristics (employing them) was performed in terms of static performance, reliability, and stability to understand the role of the incorporation of the high-κ material in the gate dielectric stack. It is shown that inherent disadvantages of the high-κ material, such as poorer interface properties and poor gate insulation, can be counterbalanced by inclusion of SiO2 both mixed with Ta2O5 and as thin interfacial layers. A stack comprising a (Ta2O5)x(SiO2)100 − x film with x = 69 and a thin SiO2 film at the interface with IGZO resulted in the best performing TFTs, with field-effect mobility (µFE) ≈ 16 cm2·V−1·s−1, subthreshold slope (SS) ≈ 0.15 V/dec and on/off ratio exceeding 107. Anomalous Vth shifts were observed during positive gate bias stress (PGBS), followed by very slow recoveries (time constant exceeding 8 × 105 s), and analysis of the stress and recovery processes for the different gate dielectric stacks showed that the relevant mechanism is not dominated by the interfaces but seems to be related to the migration of charged species in the dielectric. The incorporation of additional SiO2 layers into the gate dielectric stack is shown to effectively counterbalance this anomalous shift. This multilayered gate dielectric stack approach is in line with both the large area and the flexible electronics needs, yielding reliable devices with performance suitable for successful integration on new electronic applications.
n/a
Keywords: anomalous Vth shift; high-κ dielectrics; multicomponent dielectrics; Ta2O5/SiO2; TFTs

{Ta2O5/SiO2 Multicomponent Dielectrics for Amorphous Oxide TFTs} - Jorge Martins; Kiazadeh, Asal; Pinto, Joana V.; Rovisco, Ana; Tiago Gonçalves; Deuermeier, Jonas; Alves, Eduardo; Martins, Rodrigo; Fortunato, Elvira; Barquinha, Pedro (Electronic Materials, 2020)
Co-sputtering of SiO2 and high-$ąppa$ Ta2O5 was used to make multicomponent gate dielectric stacks for In-Ga-Zn-O thin-film transistors (IGZO TFTs) under an overall low thermal budget (T = 150 °C). Characterization of the multicomponent layers and of the TFTs working characteristics (employing them) was performed in terms of static performance, reliability, and stability to understand the role of the incorporation of the high-$ąppa$ material in the gate dielectric stack. It is shown that inherent disadvantages of the high-$ąppa$ material, such as poorer interface properties and poor gate insulation, can be counterbalanced by inclusion of SiO2 both mixed with Ta2O5 and as thin interfacial layers. A stack comprising a (Ta2O5)x(SiO2)100 − x film with x = 69 and a thin SiO2 film at the interface with IGZO resulted in the best performing TFTs, with field-effect mobility (µFE) ≈ 16 cm2·V−1·s−1, subthreshold slope (SS) ≈ 0.15 V/dec and on/off ratio exceeding 107. Anomalous Vth shifts were observed during positive gate bias stress (PGBS), followed by very slow recoveries (time constant exceeding 8 × 105 s), and analysis of the stress and recovery processes for the different gate dielectric stacks showed that the relevant mechanism is not dominated by the interfaces but seems to be related to the migration of charged species in the dielectric. The incorporation of additional SiO2 layers into the gate dielectric stack is shown to effectively counterbalance this anomalous shift. This multilayered gate dielectric stack approach is in line with both the large area and the flexible electronics needs, yielding reliable devices with performance suitable for successful integration on new electronic applications.
n/a
Keywords: $ąppa$ dielectrics; anomalous Vth shift; high; multicomponent dielectrics; Ta2O5/SiO2; TFTs

{Piezoelectricity Enhancement of Nanogenerators Based on PDMS and ZnSnO 3 Nanowires through Microstructuration} - Rovisco, Ana; dos Santos, Andreia; Cramer, Tobias; Jorge Martins; Branquinho, Rita; Águas, Hugo; Fraboni, Beatrice; Fortunato, Elvira; Martins, Rodrigo; Igreja, Rui; Barquinha, Pedro (ACS Applied Materials & Interfaces, 2020)
The current trend for smart, self-sustainable, and multifunctional technology demands for the development of energy harvesters based on widely available and environmentally friendly materials. In this context, ZnSnO3 nanostructures show promising potential because of their high polarization, which can be explored in piezoelectric devices. Nevertheless, a pure phase of ZnSnO3 is hard to achieve because of its metastability, and obtaining it in the form of nanowires is even more challenging. Although some groups have already reported the mixing of ZnSnO3 nanostructures with polydimethylsiloxane (PDMS) to produce a nanogenerator, the resultant polymeric film is usually flat and does not take advantage of an enhanced piezoelectric contribution achieved through its microstructuration. Herein, a microstructured composite of nanowires synthesized by a seed-layer free hydrothermal route mixed with PDMS (ZnSnO3@PDMS) is proposed to produce nanogenerators. PFM measurements show a clear enhancement of d33 for single ZnSnO3 versus ZnO nanowires (23 ± 4 pm/V vs 9 ± 2 pm/V). The microstructuration introduced herein results in an enhancement of the piezoelectric effect of the ZnSnO3 nanowires, enabling nanogenerators with an output voltage, current, and instantaneous power density of 120 V, 13 $μ$A, and 230 $μ$W·cm-2, respectively. Even using an active area smaller than 1 cm2, the performance of this nanogenerator enables lighting up multiple LEDs and other small electronic devices, thus proving great potential for wearables and portable electronics.
n/a
Keywords: micro-structuration; nanogenerator; nanowires; PDMS; piezoelectricity; ZnSnO3

Design and engineering of magneto-responsive devices for cancer theranostics: nano to macro perspective - Soares, Paula I. P.; Romão, Joana; Matos, Ricardo; Silva, Jorge Carvalho; João Paulo Borges (Pergamon, 2020)
n/a
n/a

Magnetic Precipitation: A New Platform for Protein Purification - Raquel dos Santos; Iria, Inês; Manuel, Ana M; Leandro, Ana P; Madeira, Catarina A C; Goncalves, Joao; Carvalho, Ana Luísa; Roque, Ana Cecília (Biotechnology JournalBiotechnology Journal, 2020)
One of the trends in downstream processing comprises the use of ?anything-but-chromatography? methods to overcome the current downfalls of standard packed-bed chromatography. Precipitation and magnetic separation are two techniques already proven to accomplish protein purification from complex media, yet never used in synergy. With the aim to capture antibodies directly from crude extracts, a new approach combining precipitation and magnetic separation was developed and named as affinity magnetic precipitation. A precipitation screening, based on the Hofmeister series, and a commercial precipitation kit were tested with affinity magnetic particles to assess the best condition for antibody capture from human serum plasma and clarified cell supernatant. The best conditions were obtained when using PEG3350 as precipitant at 4°C for 1h, reaching 80% purity and 50% recovery of polyclonal antibodies from plasma, and 99% purity with 97% recovery yield of anti-TNFα mAb from cell supernatants. These results show that the synergetic use of precipitation and magnetic separation can represent an alternative for the efficient capture of antibodies. This article is protected by copyright. All rights reserved
doi: 10.1002/biot.202000151
Keywords: affinity magnetic precipitation; antibody purification; downstream; magnetic nanoparticles; method development

SLMP53-1 interacts with wild-type and mutant p53 DNA-binding domain and reactivates multiple hotspot mutations - Gomes, Ana Sara; Ramos, Helena; Gomes, Sara; Loureiro, Joana B.; Soares, Joana; Barcherini, Valentina; Monti, Paola; Fronza, Gilberto; Oliveira, Carla; Domingues, Lucília; Bastos, Margarida; Dourado, Daniel F.A.R.; et al. (2020)
BackgroundHalf of human cancers harbour TP53 mutations that render p53 inactive as a tumor suppressor. As such, reactivation of mutant (mut)p53 through restoration of wild-type (wt)-like function represents one of the most promising therapeutic strategies in cancer treatment. Recently, we have reported the (S)-tryptophanol-derived oxazoloisoindolinone SLMP53-1 as a new reactivator of wt and mutp53 R280K with in vitro and in vivo p53-dependent antitumor activity. The present work aimed a mechanistic elucidation of mutp53 reactivation by SLMP53-1. Methods and results By cellular thermal shift assay (CETSA), it is shown that SLMP53-1 induces wt and mutp53 R280K thermal stabilization, which is indicative of intermolecular interactions with these proteins. Accordingly, in silico studies of wt and mutp53 R280K DNA-binding domain with SLMP53-1 unveiled that the compound binds at the interface of the p53 homodimer with the DNA minor groove. Additionally, using yeast and p53-null tumor cells ectopically expressing distinct highly prevalent mutp53, the ability of SLMP53-1 to reactivate multiple mutp53 is evidenced. Conclusions SLMP53-1 is a p53-activating agent with the ability to directly target wt and a set of hotspot mutp53. General Significance This work reinforces the encouraging application of SLMP53-1 in the personalized treatment of cancer patients harboring distinct p53 status.
n/a
Keywords: Cancer; Chemotherapy; Mutant; p53; Reactivator

Analytical and numerical studies for slip ﬂows of a generalised Phan-Thien-Tanner ﬂuid - Ribau, A. M.; Ferrás, L.; M. L. Morgado; M. Rebelo; A. Afonso (ZAMM Journal of applied mathematics and mechanics: Zeitschrift für angewandte Mathematik und Mechanik, 2020)

Automatic Contraction Detection Using Uterine Electromyography - Esgalhado, Filipa; Arnaldo Batista; Mouriño, Helena; Russo, Sara; dos Reis, Catarina R. Palma; Serrano, Fátima; Vassilenko, Valentina; Ortigueira, Manuel (Applied Sciences, 2020)

Collocation Solution of Fractional Differential Equations in Piecewise Nonpolynomial Spaces - M. L. Morgado; M. Rebelo (Differential and Difference Equations with Applications, 2020)

Development of Novel Galactosylated PLGA Nanoparticles for Hepatocyte Targeting Using Molecular Modelling - C.D. Raposo; Costa, R.; K. T. Petrova; Brito, C.; Scotti, M.T.; Cardoso, M.M. (Polymers, 2020)

E de repente tudo mudou… - Editorial - Morais, C.; Terroso, J.; Rocha, H. (Educação e Matemática, 2020)

Graphical representation of functions using technology: a window to teacher knowledge - Rocha, H. (Teaching Mathematics and its Applications, 2020)

High-Order Methods for Systems of Fractional Ordinary Differential Equations and Their Application to Time-Fractional Diffusion Equations - Ferrás, L.; Ford, N.; M. L. Morgado; M. Rebelo (Mathematics in Computer Science, 2020)

Interdisciplinary technological approaches from a mathematics education point of view - Viseu, F.; Rocha, H. (Science and mathematics education for 21st century citizens: challenges and ways forward, 2020)
Mathematics has a strong presence in the school curriculum, often justified by its usefulness in social life, in the world of work and by its connections with other sciences. This interdisciplinary connection, in particular when it requires constructing and refining mathematical models and discussing their applications to solve problems of other sciences, can assist students to understand why mathematics is so important in school. In the development of interdisciplinary activities, the characteristics of the tasks emerge as an important aspect. The emphasis is on the use of technological materials and the way they can support the development of concepts, provide different representations and support deeper understandings, and offer a multifaceted support to collect data and simulate experiences. Based on these assumptions, the aim of this chapter is to present, analyse and discuss tasks that promote interdisciplinary technological approaches from a mathematical point of view. In this chapter we assume interdisciplinarity as a complex construct, and in order to clarify its meaning we will discuss several types of conceptions, from multidisciplinary, to interdisciplinary, and to transdisciplinary. We will then address related concepts, such as modelling and STEM, highlighting similarities and differences between them, to reach an understanding of interdisciplinarity. In the process of the interdiciplinary approach, digital technologies arise as a central element. Based on a set of tasks on mathematics and on different sciences, we discuss what can change on an interdisciplinary approach to the teaching and learning of mathematical content and on the articulation between subjects.

Large-scale unconstrained optimization using separable cubic modeling and matrix-free subspace minimization - C. P. Brás; J. M. Martinez; M. Raydan (Computational Optimization and Applications, 2020)
We present a new algorithm for solving large-scale unconstrained optimization problems that uses cubic models, matrix-free subspace minimization, and secant-type parameters for defining the cubic terms. We also propose and analyze a specialized trust-region strategy to minimize the cubic model on a properly chosen low-dimensional subspace, which is built at each iteration using the Lanczos process. For the convergence analysis we present, as a general framework, a model trust-region subspace algorithm with variable metric and we establish asymptotic as well as complexity convergence results. Preliminary numerical results, on some test functions and also on the well-known disk packing problem, are presented to illustrate the performance of the proposed scheme when solving large-scale problems.

New information on ornithopod dinosaurs from the Late Jurassic of Portugal - Filippo Maria Rotatori; Moreno-Azanza, Miguel; Mateus,Octávio (Acta Palaeontologica Polonica, 2020)
n/a
n/a

Preliminary Insights into Electro-Sensitive Ecolubricants: A Comparative Analysis Based on Nanocelluloses and Nanosilicates in Castor Oil - Moisés García-Morales; Samuel D. Fernández-Silva,; Claudia Roman; Marius A. Olariu; Cidade, Maria T; Miguel A. Delgado (Processes, 2020)

Reinvenção do ensino a distância: a inovação ao ritmo de cada professor - Rocha, H.; Oitavem, I.; Viseu, F.; Palha, S. (Educação e Matemática, 2020)
A suspensão das aulas presenciais na sequência da pandemia que estamos a atravessar trouxe para primeiro plano o ensino a distância. Neste artigo partilhamos algumas ideias e conceptualizações relativas a este tipo de ensino, abordamos aquilo que alguns autores que se têm dedicado à temática apontam como importantes desafios e oportunidades que se lhe encontram associados e, por fim, partilhamos algumas possíveis opções e recursos que pensamos poderem ser úteis para todos os professores que estão a viver a sua primeira experiência de ensino a distância.

Shear and flexural strengthening of deficient flat slabs with post-installed bolts and CFRP composites bonded through EBR and EBROG - Ala Torabian; Isufi, Brisid; Davood Mostofinejad; Ramos, António Pinho (Structural Concrete, 2020)
Abstract Fiber reinforced polymer (FRP) composites can be efficient for flexural strengthening of flat slabs if debonding of the FRP is postponed. However, with the increase of the flexural capacity, the flat slab becomes more susceptible to punching shear failure. In this context, four flexural or simultaneous flexural and punching shear retrofitting systems are investigated in this study to strengthen a flexure-deficient flat slab. Externally Bonded Reinforcement on Grooves (EBROG) and externally bonded reinforcement (EBR) methods are used for flexural strengthening in two cases: slabs without punching shear reinforcement and with post-installed shear bolts as shear reinforcement. According to the results, flexural strengthening of the slab using the EBR and EBROG techniques increased its load capacity by 12% and 21%, respectively. Simultaneous flexural and shear strengthening of the slab using the EBROG technique was the most effective, leading to a 57% enhancement of the load capacity. For specimens whose failure was governed by punching, comparing the results with code predictions showed that Eurocode and ACI (and the respective guide documents fib bulletin 90 and ACI 440.2R) overestimated the capacity of these specimens. In cases where failure was governed by flexure, a simple application of the yield line theory predicted reasonably well the load capacity of the specimens.
n/a
Keywords: Debonding; EBR; EBROG; Flat slab; FRP composite; post-installed shear bolts; punching shear failure

A state of the art of flat-slab frame tests for gravity and lateral loading - Coronelli, Dario; Muttoni, Aurelio; Pascu, Ion R.; Ramos, Antonio P.; Netti, Teresa (Structural Concrete, 2020)
Abstract This paper presents a critical review of the state of the art of experimental research concerning the seismic response of reinforced concrete flat slab frames. After a summary of tests on connections, the paper examines tests carried out on frames with gravity and cyclic lateral loading, and shake table tests; scaled specimens and one real scale study are included. A discussion of the results reached so far is provided focusing on the global response, the different load types and effects; the ultimate rotations at failure in relation to the gravity shear and a classification of different failure modes for different types of connections. Based on this analysis, the research needs are highlighted. An experimental program launched to address these open questions is described. Further open topics are highlighted.
n/a
Keywords: cyclic and dynamic lateral loading; full-scale multi-story RC flat slab building; Punching; testing

Teachers as task designers in the digital age: Teaching using technology - Rocha, H.; Faggiano, E.; Mennuni, F. (Proceedings of the 10th ERME Topic Conference - MEDA 2020, 2020)
The aim of the paper is to present and analyse the case of one teacher attempting to introduce his students to fractals using digital technology. His task design process has been made explicit through the writing of a storyboard. It has been analysed in order to focus on the stages of the process, identifying prominent elements in it by using the knowledge quartet framework. Results can be useful to inform teacher educators about his needs with respect to the development of his ability in task design. The importance of this aspect, particularly worth of note in the digital age in which teachers have many opportunities to access teaching resources online, has been amplified by the constraints to which educational systems have been subjected during the Covid-19 pandemic emergency.

Using tasks to develop pre-service teachers’ knowledge for teaching mathematics with digital technology - Rocha, H. (ZDM Mathematics Education, 2020)
Teacher education is central to the development of the professional knowledge of pre-service teachers. The main goal of this paper is to refect on the development that the analysis (done by a group of pre-service secondary teachers) of a set of tasks, based on elements related to domains of KTMT—Knowledge for Teaching Mathematics with Technology—can bring to the knowledge of pre-service teachers of mathematics. Specifcally, the goal was to investigate the following questions: (1) What are the factors that guide the pre-service teachers’ task discussion? (2) Which KTMT domains are emphasized by pre-service teachers during task discussion? The elements taken into account are the characteristics of the tasks (focus on cognitive level, structuring level and technology role), the use of representations (focus on balance and articulation of representations), and the equilibrium between experimentation (focus on digital technology afordances) and justifcation (focus on argumentation and proof). The methodology of this case study involves a qualitative approach. The main conclusions suggest that infuences in the pre-service teachers’ discussion of tasks fell into the following categories: the potentialities of technology, the type of tasks, and the prospective teachers’ experience with a set of tasks, and analysis of some real students’ reports. With regard to KTMT, although it was possible to identify some global development, Teaching and Learning and Technology Knowledge was the domain in which stronger development took place.

Uterine contractions clustering based on electrohysterography - Esgalhado, Filipa; Arnaldo Batista; Mouriño, Helena; Russo, Sara; Palma dos Reis, Catarina; Serrano, Fátima; Vassilenko, Valentina; Ortigueira, Manuel (Computers in Biology and Medicine, 2020)

Behavior of RC flat slabs with shear bolts under reversed horizontal cyclic loading - Almeida, André F.O.; Ramos, António P; Válter Lúcio; Marreiros, Rui (Structural Concrete, 2020)
Abstract An experimental work on reinforced concrete flat slab specimens to test the efficiency of postinstalled bolts, as punching shear reinforcement in resisting vertical and cyclic horizontal loads, was conducted and is presented in this paper. The test protocol consisted in increasing horizontal drifts combined with constant vertical load until failure. Two different detailing solutions for the shear reinforcement were considered, one using a radial distribution around the column and another using a cross distribution, being the results compared with a previously tested reference specimen. The dimensions of the specimens were 4.25 x 1.85 x 0.15 m3. The test setup used for these tests was developed by the research team and simulates the boundary conditions with already recognized good results. Postinstalled steel bolts were proven to be an efficient solution for strengthening of existing structures, improving the structural behavior, and the punching resistance.
n/a
Keywords: bolts; Cyclic horizontal action; Flat slab; shear reinforcement; strengthening for punching

Behaviour of reinforced-concrete flat slabs with stirrups under reversed horizontal cyclic loading - Almeida, André F.O.; Alcobia, Bruno; Ornelas, Miguel; Marreiros, Rui; Ramos, António Pinho (Magazine of Concrete Research, 2020)
This paper describes the experimental campaign to study the behaviour of reinforced-concrete flat slab structures with steel stirrups as punching shear reinforcement, under combined vertical and horizontal cyclic loading. The vertical load was first applied and kept constant during the test, while, regarding the cyclic horizontal loading, imposed cyclic drifts were increased until failure. Four slab specimens with shear reinforcement were tested and the results compared to a control slab specimen without shear reinforcement. The studied variables were different shear reinforcement ratios and the number of stirrup layers. The slabs were 4·15 × 1·85 m2 and 0·15 m thick, connected to two steel half-columns. The test setup used was developed by the research team and aimed to simulate the boundary conditions of a flat slab, representing the slab between middle spans in one direction and between zero bending moment points in the other direction. Results show that the use of steel stirrups as shear reinforcement is very effective, increasing shear, drift and energy dissipation capacities. The obtained results were also compared to the provisions given by European and American codes.
n/a

Flexural strengthening of flat slabs with FRP composites using EBR and EBROG methods - Ala Torabian; Isufi, Brisid; Davood Mostofinejad; Ramos, António Pinho (Engineering Structures, 2020)
One of the major disadvantages of conventional fibre-reinforced polymer (FRP) strengthening techniques is the premature debonding of the FRP, leading to an underutilization of the materials. The externally bonded reinforcement on grooves (EBROG) method, which has been proven successful in postponing debonding in several structural applications, is examined in this study for the first time for realistic conditions in flat slabs. To this end, two different layouts of the strengthening solution are tested under concentric monotonic loading: one representing roof-level slab-column connections in which carbon FRP (CFRP) sheets are laid on top of the joint region (cross layout); and another one representing intermediate floors, in which the aforementioned layout is not possible due to the presence of the column (grid layout). For each layout, two FRP bonding techniques are used: conventional externally bonded reinforcement (EBR) and EBROG. Another specimen, without FRP strengthening, is used as a reference. It is shown that the EBROG technique is effective in postponing debonding for both layouts. Compared to the specimens in which EBR was used, the load capacity was increased in case of EBROG by 36% when FRP sheets were bonded on top of the joint (cross layout) and by 15% when sheets were attached outside the joint region (grid layout). Debonding strains are shown to be significantly higher in the case of EBROG compared to EBR. The experimentally observed debonding strains were compared with code provisions and predictions of models from the literature. A simple calculation method giving reasonably good results for the load capacity of the FRP-strengthened specimens is presented.
n/a
Keywords: CFRP; Concentric loading; Debonding; EBR; EBROG; Flat slab

A hybrid method for the calibration of finite element models of punching-shear in R/C flat slabs - Lapi, Massimo; Lorenzo Secci; Emanuele Teoni; Ramos, Antonio Pinho; Orlando, Maurizio (Computers & Structures, 2020)
The paper is focused on the calibration of non-linear 3D finite element (FE) analyses to simulate punching failure of R/C flat slabs. The calibration procedure is developed with reference to the code ABAQUS, which is one of the most used computer codes in nonlinear modelling of R/C structures. Generally, the calibration of a nonlinear FE model is grounded on one test only, so its reliability could be limited. Here a hybrid method for the calibration of FE models of R/C flat slabs failing in punching is proposed and discussed. The method consists in calibrating input data by comparison of finite element model (FEM) results with both experimental data and predictions provided by analytical models. The procedure allows for a consistent calibration to be performed, valid for a wide range of longitudinal reinforcement ratios, from 0.5% to 2.00%, and concrete grades, from C20/25 to C50/60. A case study is investigated using the proposed method. Results show that calibrated values of the fracture energy lie between those provided by Model Code 1990 and Model Code 2010. From the new calibration procedure, a relationship between fracture energy and concrete compressive strength is also derived and blind analyses are performed to check its reliability against experimental results.
n/a

Influence of the top reinforcement detailing in the behaviour of flat slabs - Ricardo Faria; Marreiros, Rui; Ramos, António Pinho; Catarina Jesus (Structures, 2020)
This paper studies the influence of different longitudinal top reinforcement detailing on the behaviour and punching capacity of flat slabs. Experimental and numerical studies were carried out. The experimental campaign consisted in testing three reinforced concrete slabs 2.20 m wide with a thickness equal to 0.15 m. The numerical study was conducted using the non-linear finite element software ATENA 3D. Using numerical models, which were calibrated using the experimental tests, a parametric study was carried out to include other design solutions beyond the tested ones. The parameters that were changed in this parametric study were the steel reinforcement ratio, the concrete strength and the detailing of the top steel reinforcement, namely using a solution with uniform distribution and other with a higher concentration of reinforcement near the column. Finally, the results were compared with predictions obtained using some of the existing codes (Eurocode 2 and Model Code 2010). From this study it can be concluded that concentrating the top flexural reinforcement, keeping the same total amount of top longitudinal reinforcement, results in a stiffer response, an increment in the punching resistance, and a decrease in the maximum vertical displacement.
n/a
Keywords: Flat slabs; Numerical analysis; Punching; Reinforced concrete

Low velocity impact response of 3D printed structures formed by cellular metamaterials and stiffening plates: PLA vs. PETg - F.A. Santos; Rebelo, H.; M. Coutinho; L.S. Sutherland; C. Cismasiu; I. Farina; F. Fraternali (Composite Structures, 2020)
This work studies the low-velocity impact response of 3D-printed layered structures made of thermoplastic materials (PLA and PETg), which form sacrificial claddings for impact protection. The analyzed structures are composed of crushable cellular cores placed in between terminal stiffening plates. The cores tessellate either honeycomb hexagonal unit cells, or hexagonal cells with re-entrant corners, with the latter exhibiting auxetic response. The given results highlight that the examined PETg protectors exhibit higher energy dissipation ratios and lower restitution coefficients, as compared to PLA structures that have the same geometry. It is concluded that PETg qualifies as an useful material for the fabrication of effective impact protection gear through ordinary, low-cost 3D printers.
n/a
Keywords: Auxetic response; Cellular metamaterials; Low Velocity Impact; PETg; PLA

Mineral Content of Food Supplements of Plant Origin, by Energy Dispersive X-ray Fluorescence: A Risk Assessment - Reboredo, Fernando Henrique; A. Barbosa; Silva, Maria Manuela; Carvalho, Maria Luisa; Santos, José Paulo; Pessoa, Maria Fernanda; Fernando Lidon; Ramalho, José C.; Guerra, Mauro (Exposure and Health, 2020)
The aim of this study is to evaluate the elemental composition of six food supplements of plant origin, commonly sold in the Portuguese market, by energy dispersive X-ray fluorescence. The presence of arsenic in all the Maca, Ashwagandha, Camu-Camu and Hemp protein samples (except the generic form) is a reason of concern due to the long-term effects of As mainly in its inorganic form. Thus, great caution must be taken on some food supplements, particularly the cases of Moringa from Egypt and Yellow/Xpresso Maca, whose inorganic As concentrations are in line with the upper bound concentration for the 95th dietary exposure according to the European Food Safety Authority which is 0.64 μg/kg bw/day. In what regards Hemp protein, if the supplier’s daily intake recommendation (30 g) is followed, values as high as 1.75 μg/kg bw/day of inorganic As will be consumed, which are dangerously above the upper bound. In this case this specific supplement lot should be removed from the market. Also the consumption of Hemp protein leads to a daily intake of Mn above the Daily Reference Intake (DRI) and Adequate Intakes (AIs) for adults. The contamination of Goji berries by Pb is a reason for concern—organic berries contained 11.3 μg/g while berries derived from conventional agriculture 11.6 μg/g, leading to daily intake doses of 315.3 μg and 324.8 μg, respectively, if the recommended daily intake of 28 g is followed. Our findings point out to an inadequacy of the recommended intakes by the supplier vis a vis the concentrations observed, greatly increasing the risk for public health.
info:eu-repo/grantAgreement/FCT/5876/147413/PT# Fundacao para a Ciencia e Tecnologia (FCT) through the research center Grants (LIBPhys-UNL) UID/GEO/04035/2019 (GeoBioTech); UID/AGR/04129/2019 (LEAF).
Keywords: Food supplements; Mineral composition; Risk assessment; X-ray fluorescence

Molecular basis for the preferential recognition of β1,3-1,4-glucans by the family 11 carbohydrate-binding module from Clostridium thermocellum - Ribeiro, Diana O.; Viegas, Aldino; Pires, Virgínia M R; Medeiros-Silva, João; Bule, Pedro; Chai, Wengang; Marcelo, Filipa; Fontes, Carlos M. G. A.; Cabrita, Eurico J.; Palma, Angelina S.; Carvalho, Ana Luísa (The FEBS Journal, 2020)
Understanding the specific molecular interactions between proteins and β1,3-1,4-mixed-linked d-glucans is fundamental to harvest the full biological and biotechnological potential of these carbohydrates and of proteins that specifically recognize them. The family 11 carbohydrate-binding module from Clostridium thermocellum (CtCBM11) is known for its binding preference for β1,3-1,4-mixed-linked over β1,4-linked glucans. Despite the growing industrial interest of this protein for the biotransformation of lignocellulosic biomass, the molecular determinants of its ligand specificity are not well defined. In this report, a combined approach of methodologies was used to unravel, at a molecular level, the ligand recognition of CtCBM11. The analysis of the interaction by carbohydrate microarrays and NMR and the crystal structures of CtCBM11 bound to β1,3-1,4-linked glucose oligosaccharides showed that both the chain length and the position of the β1,3-linkage are important for recognition, and identified the tetrasaccharide Glcβ1,4Glcβ1,4Glcβ1,3Glc sequence as a minimum epitope required for binding. The structural data, along with site-directed mutagenesis and ITC studies, demonstrated the specificity of CtCBM11 for the twisted conformation of β1,3-1,4-mixed-linked glucans. This is mediated by a conformation–selection mechanism of the ligand in the binding cleft through CH-π stacking and a hydrogen bonding network, which is dependent not only on ligand chain length, but also on the presence of a β1,3-linkage at the reducing end and at specific positions along the β1,4-linked glucan chain. The understanding of the detailed mechanism by which CtCBM11 can distinguish between linear and mixed-linked β-glucans strengthens its exploitation for the design of new biomolecules with improved capabilities and applications in health and agriculture. Database Structural data are available in the Protein Data Bank under the accession codes 6R3M and 6R31.
n/a
Keywords: 3-1; 4-mixed-linked glucans; carbohydrate specificity; carbohydrate-binding module; cellulosome; Clostridium thermocellum; β1

Post-earthquake Performance of a Slab-Column Connection with Punching Shear Reinforcement - Isufi, Brisid; Ramos, António Pinho; Válter Lúcio (Journal of Earthquake Engineering, 2020)
n/a
n/a

Primary Metabolism Is Distinctly Modulated by Plant Resistance Inducers in Coffea arabica Leaves Infected by Hemileia vastatrix - Possa, Kátia Ferreira; Silva, Joyce Alves Goulart; Resende, Mário Lúcio Vilela; Tenente, Rita; Pinheiro, Carla; Chaves, Inês; Planchon, Sebastien; Monteiro, Ana Cristina Andrade; Renaut, Jenny; Carvalho, Milene Alves Figueiredo; Ricardo, Cândido Pinto; Guerra-Guimarães, Leonor (Frontiers in Plant Science, 2020)
n/a
n/a

Punching of reinforced concrete flat slabs – Rational use of high strength concrete - Inácio, Micael M.G.; Lapi, Massimo; Ramos, Antonio Pinho (Engineering Structures, 2020)
This paper deals with punching of reinforced high strength concrete (HSC) flat slabs. Despite the use of HSC increased significantly in the last years, the experimental research on punching behavior of HSC slabs is still limited. Furthermore, most of this past research adopted concrete compressive strength lower than 90 MPa. In a previous work by this research group three specimens with concrete compressive strength around 120 MPa and one with normal strength concrete (NSC) were tested. The present work represents the continuation of the previous activity and it is focused on the rational use of HSC. Four specimens with HSC and one of NSC were tested under monotonic vertical loading. The HSC was placed only in the slab-column connection region and it was limited to a thin layer in the compressive zone, in order to have a more economical and sustainable solution. This rational use of the HSC showed excellent results in terms of punching strength. Limiting the HSC to a thin layer in the compressive zone resulted in an almost equal punching strength to that obtained with the slab entirely casted in HSC.
n/a

Sunlight-driven CO2-to-fuel conversion: Exploring thermal and electrical coupling between photovoltaic and electrochemical systems for optimum solar-methane production - Lourenço, A.C.; Reis-Machado, A. S.; Fortunato, E.; Martins, R.; Mendes, MJ (Materials Today Energy, 2020)
n/a
cited By 1

{Rail-to-Rail Timing Signals Generation Using InGaZnO TFTs for Flexible X-Ray Detector} - Bahubalindruni, Pydi Ganga; Barquinha, Pedro; Bhawna Tiwari; Pereira, Maria; Santa, Ana; Jorge Martins; Rovisco, Ana; Tavares, Vitor; Martins, Rodrigo; Fortunato, Elvira (IEEE Journal of the Electron Devices Society, 2020)
This paper reports on-chip rail-to-rail timing signals generation thin-film circuits for the first time. These circuits, based on a-IGZO thin-film transistors (TFTs) with a simple staggered bottom gate structure, allow row and column selection of a sensor matrix embedded in a flexible radiation sensing system. They include on-chip clock generator (ring oscillator), column selector (shift register) and row-selector (a frequency divider and a shift register). They are realised with rail-to-rail logic gates with level-shifting ability that can perform inversion and NAND logic operations. These logic gates are capable of providing full output swing between supply rails, $V_{DD}$ and $V_{SS}$ , by introducing a single additional switch for each input in bootstrapping logic gates. These circuits were characterised under normal ambient atmosphere and show an improved performance compared to the conventional logic gates with diode connected load and pseudo CMOS counterparts. By using these high-performance logic gates, a complete rail-to-rail frequency divider is presented from measurements using D-Flip Flop. In order to realize a complete compact system, an on-chip ring oscillator (output clock frequency around 1 kHz) and a shift register are also presented from simulations, where these circuits show a power consumption of 1.5 mW and 0.82 mW at a supply voltage of 8 V, respectively. While the circuit concepts described here were designed for an X-ray sensing system, they can be readily expanded to other domains where flexible on-chip timing signal generation is required, such as, smart packaging, biomedical wearable devices and RFIDs.
n/a
Keywords: flexible radiation sensing system; IGZO TFT; Rail-to-rail logic gates; timing signals

A computational comparison of compact MILP formulations for the zero forcing number - Agostinho Agra; Jorge Orestes Cerdeira; Cristina Requejo (Discrete Applied Mathematics, 2019)
n/a
n/a

{Growth Mechanism of Seed-Layer Free ZnSnO3 Nanowires: Effect of Physical Parameters} - Rovisco, Ana; Branquinho, Rita; Jorge Martins; Fortunato, Elvira; Martins, Rodrigo; Barquinha, Pedro (Nanomaterials, 2019)
ZnSnO3 semiconductor nanostructures have several applications as photocatalysis, gas sensors, and energy harvesting. However, due to its multicomponent nature, the synthesis is far more complex than its binary counter parts. The complexity increases even more when aiming for low-cost and low-temperature processes as in hydrothermal methods. Knowing in detail the influence of all the parameters involved in these processes is imperative, in order to properly control the synthesis to achieve the desired final product. Thus, this paper presents a study of the influence of the physical parameters involved in the hydrothermal synthesis of ZnSnO3 nanowires, namely volume, reaction time, and process temperature. Based on this study a growth mechanism for the complex Zn:Sn:O system is proposed. Two zinc precursors, zinc chloride and zinc acetate, were studied, showing that although the growth mechanism is inherent to the material itself, the chemical reactions for different conditions need to be considered.
n/a
Keywords: growth mechanism; hydrothermal synthesis; nanowires; znsno 3; zto

Distinctive phytohormonal and metabolic profiles of Arabidopsis thaliana and Eutrema salsugineum under similar soil drying - Pinheiro, Carla; Elizabeth Dickinson; Andrew Marriott; Ribeiro, Isa C.; Marta Pintó-Marijuan; Carla António; Zarrouk, Olfa; Chaves, Maria Manuela; Ian C. Dodd; Sergi Munné-Bosch; Jane Thomas-Oates; Julie Wilson (Planta, 2019)
n/a
n/a

Low power electronics based on Parylene-C hybrid devices: top gate vs bottom gate TFTs - Pinto, Joana V.; C.F. Fernandes; Inês Martins; Rovisco, Ana; Jorge Martins; Kiazadeh, Asal; Barquinha, Pedro; Martins, Rodrigo; Fortunato, Elvira (2019)
n/a
n/a

{Prediction of sunlight-driven CO2 conversion: Producing methane from photovoltaics, and full system design for single-house application} - Vieira, F.; Sarmento, B.; Reis-Machado, A. S.; Facão, J.; Carvalho, M. J.; Mendes, MJ; Fortunato, E.; Martins, R. (Materials Today Energy, 2019)
CO2 capture and utilization (CCU) technologies are being immensely researched as means to close the anthropogenic carbon cycle. One approach known as artificial photosynthesis uses solar energy from photovoltaics (PV), carbon dioxide and water to generate hydrocarbon fuels, being methane (CH4) a preferential target due to the already in place infrastructures for its storage, distribution and consumption. Here, a model is developed to simulate a direct (1-step) solar methane production approach, which is studied in two scenarios: first, we compare it against a more conventional 2-step methane production route, and second, we apply it to address the energetic needs of concept buildings with usual space and domestic hot water heating requirements. The analysed 2-step process consists in the PV-powered synthesis of an intermediate fuel – syngas – followed by its conversion to CH4 via a Fischer–Tropsch (methanation) process. It was found that the 1-step route could be adequate to a domestic, small scale use, potentially providing energy for a single-family house, whilst the 2-step can be used in both small and large scale applications, from domestic to industrial uses. In terms of overall solar-to-CH4 energy efficiency, the 2-step method reaches 13.26{%} against the 9.18{%} reached by the 1-step method. Next, the application of the direct solar methane technology is analysed for domestic buildings, in different European locations, equipped with a combination of solar thermal collectors (STCs) and PV panels, in which the heating needs that cannot be fulfilled by the STCs are satisfied by the combustion of methane synthesized by the PV-powered electrolyzers. Various combinations of situations for a whole year were studied and it was found that this auxiliary system can produce, per m2 of PV area, in the worst case scenario 23.6 g/day (0.328 kWh/day) of methane in Stockholm, and in the best case scenario 47.4 g/day (0.658 kWh/day) in Lisbon.
n/a
Keywords: Artificial photosynthesis; Building-integrated solar methane; CO2 electrolysis; Fisher–Tropsch synthesis; Photovoltaic-powered electrochemical conversion

{Colloidal-structured metallic micro-grids: High performance transparent electrodes in the red and infrared range} - Torrisi, Giacomo; Luis, João S.; Sanchez-Sobrado, Olalla; Raciti, Rosario; Mendes, Manuel J; Águas, Hugo; Fortunato, Elvira; Martins, Rodrigo; Terrasi, Antonio (Solar Energy Materials and Solar Cells, 2019)
One of the most promising approaches to produce industrial-compatible Transparent Conducting Materials (TCMs) with excellent characteristics is the fabrication of TCO/metal/TCO multilayers. In this article, we report on the electro-optical properties of a novel high-performing TCO/metal/TCO structure in which the intra-layer is a micro-structured metallic grid instead of a continuous thin film. The grid is obtained by evaporation of Ag through a mask of polystyrene colloidal micro-spheres deposited by the Langmuir-Blodgett method and partially dry-etched in plasma. IZO/Ag grid/IZO structures with different thicknesses and mesh dimensions have been fabricated, exhibiting excellent electrical characteristics (sheet resistance below 10 $Ømega$/□) and particularly high optical transmittance in the near-infrared spectral region as compared to planar (unstructured) TCM multilayers. Numerical simulations were also used to highlight the role of the Ag mesh parameters on the electrical properties.
n/a
Keywords: Ag micro-grid; IR trasmittance; Multilayer thin film; Transparent conductive electrodes

{Nontoxic glasses: Preparation, structural, electrical and biological properties} - Gavinho, Sílvia R; Prezas, Pedro R; Ramos, Diogo J; Sá‐Nogueira, Isabel; Borges, Joao P; M. Carmo Lança; Silva, Jorge C; Henriques, Célia MR; Pires, Eduardo; Kumar, Jakka Suresh; Graça, M. P. F. (International Journal of Applied Ceramic Technology, 2019)
n/a
n/a
Keywords: antibacterial properties; Bioactive glass; biomaterial; cytotoxicity; electrical properties

3D printed PLA sacrificial honeycomb cladding blast mitigation - H. B. Rebelo; D. Lecompte; Cismaşiu, C.; A. Jonet; B. Belkassem; A. Maazoun (18th International Symposium for the Interaction of Munitions with Structures (ISIEMS), 2019)

Development of polymeric anepectic meshes: auxetic metamaterials with negative thermal expansion - Raminhos, JS; J.P. Borges; Velhinho, A. (IOP Publishing, 2019)
n/a
n/a

Injectable Hydrogels Based on Pluronic/Water Systems Filled with Alginate Microparticles for Biomedical Applications - Ramos, DJ; Carrelo, H; J.P. Borges; Calero Romero, Nuria; Santos García, Jenifer; Cidade, María Teresa (Materials, 2019)
n/a
n/a

Nontoxic glasses: Preparation, structural, electrical and biological properties - Gavinho, Sílvia R; Prezas, Pedro R; Ramos, Diogo J; Sá‐Nogueira, Isabel; Borges, Joao P; M. Carmo Lança; Silva, Jorge C; Henriques, Célia MR; Pires, Eduardo; Kumar, Jakka Suresh (2019)
n/a
n/a

As diferentes representações de funções e a compreensão de alunos do ensino secundário num contexto de integração da tecnologia - Rocha, H. (XV Congresso Internacional Galego-Portugués de Psicopedagogia, 2019)
The different representations of functions are assumed as central on the development of the concept of function. Being widely recognized the complexity of this concept, the different representations allow the student to understand in a representation what could not be understood in another representation. And the integration of technology into the teaching and learning process provides an easy and quick way to access different representations. This study intends to analyse the understanding of upper secondary students about the information transmitted by each of the representations of functions usually available on technology. Specifically, it intends to understand which transitions between representations are more easily understood by the students and which ones are more difficult to perform. It also intended to identify some aspects that may contribute to this. This study adopts a quantitative methodology in which the answers given by a class to a test focused on the transition from one representation to another are analysed; and a qualitative methodology based on interviews to three of the students in the class, as a way of seeking comprehension about their answers. The results achieved suggest a greater ease of understanding associated to the graphical representation and a greater difficulty associated to the tabular representation. The reasons for this seem to be related to the specific characteristics of each representation, but fundamentally with aspects related to the experiences lived by the students on the mathematics classes, being the integration of technology an influence not to neglect.

Barcodes: The Mathematics of everyday life - Rocha, H.; Oitavem, I. (The Scottish Mathematical Council Journal, 2019)

Behavior of RC flat slabs with shear bolts under reversed horizontal cyclic loading - Almeida, André F.O.; Ramos, António P; Válter Lúcio; Marreiros, Rui (Structural Concrete, 2019)
Abstract An experimental work on reinforced concrete flat slab specimens to test the efficiency of postinstalled bolts, as punching shear reinforcement in resisting vertical and cyclic horizontal loads, was conducted and is presented in this paper. The test protocol consisted in increasing horizontal drifts combined with constant vertical load until failure. Two different detailing solutions for the shear reinforcement were considered, one using a radial distribution around the column and another using a cross distribution, being the results compared with a previously tested reference specimen. The dimensions of the specimens were 4.25 x 1.85 x 0.15 m3. The test setup used for these tests was developed by the research team and simulates the boundary conditions with already recognized good results. Postinstalled steel bolts were proven to be an efficient solution for strengthening of existing structures, improving the structural behavior, and the punching resistance.
n/a
Keywords: bolts; Cyclic horizontal action; Flat slab; shear reinforcement; strengthening for punching

Behavior of RC flat slabs with shear bolts under reversed horizontal cyclic loading - Almeida, André F.O.; Ramos, António P; Válter Lúcio; Marreiros, Rui (Structural Concrete, 2019)
Abstract An experimental work on reinforced concrete flat slab specimens to test the efficiency of postinstalled bolts, as punching shear reinforcement in resisting vertical and cyclic horizontal loads, was conducted and is presented in this paper. The test protocol consisted in increasing horizontal drifts combined with constant vertical load until failure. Two different detailing solutions for the shear reinforcement were considered, one using a radial distribution around the column and another using a cross distribution, being the results compared with a previously tested reference specimen. The dimensions of the specimens were 4.25 x 1.85 x 0.15 m3. The test setup used for these tests was developed by the research team and simulates the boundary conditions with already recognized good results. Postinstalled steel bolts were proven to be an efficient solution for strengthening of existing structures, improving the structural behavior, and the punching resistance.
n/a
Keywords: bolts; Cyclic horizontal action; Flat slab; shear reinforcement; strengthening for punching

Black-Scholes Equation with Distributed Order in Time - M. L. Morgado; M. Rebelo (Progress in Industrial Mathematics at ECMI 2018, 2019)

Crystallography of Lourinhanosaurus eggshells (Dinosauria, Theropoda, Allosauroidea) - M. Moreno Azanza; R. Coimbra; Puértolas-Pascual, E.; Russo, J.; B. Bauluz; O. Mateus (Journal of Vertebrate Paleontology, Program and Abstracts, 2019)

Desenvolver o conhecimento de futuros professores sobre as características das tarefas e o papel que a tecnologia pode assumir nestas - Rocha, H. (SIEM, 2019)
The main goal of this work is to characterize how the knowledge of pre-service teachers about the characteristics of the tasks and the role of technology evolves. Based on a case study carried out around a pair of pre-service teachers, the main conclusions point to the contribution of the reflection around a set of six tasks on Functions selected by the pre-service teachers. Central to this reflection was an analyze of the role technology can play in tasks, the comments made by the colleagues to their tasks and some experiences on modeling and open-ended tasks. These elements provided the development of a greater awareness regarding aspects such as the level of structuring of the task and its degree of challenge. And this was determinant for an appropriation of the different characteristics of the tasks and to the development of the pre-service teachers’ knowledge.

Discrete formulation for the dynamics of rods deforming in space - Ana Casimiro; César Rodrigo (Journal of Mathematical Physics, 2019)

Experimental and numerical investigation on 3D printed PLA sacrificial honeycomb cladding - H. B. Rebelo; D. Lecompte; C. Cismasiu; A. Jonet; B. Belkassem; A. Maazoun (International Journal of Impact Engineering, 2019)

Exploratory study on geodesic domes under blast loads - Hugo Bento Rebelo; Amarante dos Santos, Filipe; Corneliu Cismasiu; Duarte Santos (International Journal of Protective Structures, 2019)

Flat slab strenghtening techniques against punching-shear - Lapi, M.; Ramos, A. P.; Orlando, M. (Engineering Structures, 2019)
n/a
cited By 0

The Fossil Record of Biodiversity in Angola Through Time: A Paleontological Perspective - Mateus,Octávio; Pedro M. Callapez; Michael J. Polcyn; Anne S. Schulp; António Olímpio Gonçalves; Jacobs,Louis L. (Biodiversity of Angola: Science & Conservation: A Modern Synthesis, 2019)
This chapter provides an overview of the alpha paleobiodiversity of Angola based on the available fossil record that is limited to the sedimentary rocks, ranging in age from Precambrian to the present. The geological period with the highest paleobiodiversity in the Angolan fossil record is the Cretaceous, with more than 80{%} of the total known fossil taxa, especially marine molluscs, including ammonites as a majority among them. The vertebrates represent about 15{%} of the known fauna and about one tenth of them are species firstly described based on specimens from Angola.
n/a

A generalised Phan-Thien -Tanner model - Ferrás, L. L.; M. L. Morgado; M. Rebelo; Mckinley, G. H.; A. Afonso (Journal of Non-Newtonian Fluid Mechanics, 2019)

The Human Side of Robots and the Robot Side of Us - António B. Moniz; Irina Liubertė; Bernadeta Goštautaitė; Živilė Stankevičiūtė; Trish Reay; Eglė Staniškienė; Ilona Bučiūnienė (International Conference on Organisational Learning, Knowledge and Capabilities, 2019)

A Hybrid Numerical Scheme for Fractional-Order Systems - Ferrás, L.; Ford, N.; M. L. Morgado; M. Rebelo (Innovation, Engineering and Entrepreneurship, 2019)

Identification of proofs via syzygies - Malheiro, António; José Francisco Reis (Philosophical Transactions of the Royal Society A, 2019)
In 1900, Hilbert gave a lecture at the International Congress of Mathematicians in Paris, for which he prepared 23 problems that mathematicians should solve during the twentieth century. It was found that there was a note on a 24th Problem focusing on the problem of simplicity of proofs. One of the lines of research that was generated from this problem was the identification of proofs. In this article, we present a possible method for exploring the identification of proofs based on the membership problem original from the theory of polynomial rings. To show this, we start by giving a complete worked-out example of a membership problem, that is, the problem of checking if a given polynomial belongs to an ideal generated by finitely many polynomials. This problem can be solved by considering Gröbner bases and the corresponding reductions. Each reduction is a simplification of the polynomial and it corresponds to a rewriting step. In proving that a polynomial is a member of an ideal, a rewriting process is used, and many different such processes can be considered. To better illustrate this, we consider a graph where each rewriting step corresponds to an edge, and thus a path corresponds to a rewriting process. In this paper, we consider the identification of paths, within the context of the membership problem, to propose a criterion of identification of proofs. This article is part of the theme issue ‘The notion of ‘simple proof’ - Hilbert’s 24th problem’.

The impact of technology on the teachers’ use of different representations - Rocha, H. (CERME, 2019)
The potential of using different representations is widely recognized, but not much is known about how teachers use them nor about the impact of the technology on such use. The goal of this study is to characterize the teachers’ representational fluency when teaching functions at high school level, discussing, at the same time, the impact in the use of representations resulting from the use of technology. Adopting a qualitative approach, I analyze one teacher’s practice. The results suggest that algebraic and graphical representations are seen as more important, that tabular representation is assumed as irrelevant and that the access to technology impacts the learning, the representations used and how they are used.

Injectable Hydrogels Based on Pluronic/Water Systems Filled with Alginate Microparticles for Biomedical Applications - Cidade, M.T.; Ramos, DJ; Santos, J.; Carrelo, H; Calero, N.; J.P. Borges (Materials, 2019)

Interdisciplinary tasks: pre-service teachers’ choice and approach - Rocha, H. (Science and mathematics education in the 21st century, 2019)
This study focusses on the criteria used by pre-service teachers of Mathematics to choose interdisciplinary tasks. The pre-service teachers’ knowledge is assumed as the basis of the actions taken and used as the origin of the choices and approaches observed. The study adopts a qualitative and interpretative methodology and the data were collected using class observation and interviews. The analysis is guided by the Application and Pedagogical Content Knowledge, a model inspired on TPACK (from Mishra and Koehler) and MKT (from Ball and colleagues). The conclusions point to an appreciation of the mathematical part of the tasks and to a devaluation of the remaining components. This suggests difficulty in articulating and integrating different domains of knowledge and points to a fragmented view of the potential of using mathematical applications.

Mathematical proof: from mathematics to school mathematics - Rocha, H. (Philosophical Transactions of the Royal Society A, 2019)
Proof plays a central role in developing, establishing, and communicating mathematical knowledge. Nevertheless it is not such a central element in school mathematics. This article discusses some issues involving mathematical proof in school, intending to characterize the understanding of mathematical proof in school, its function and the meaning and relevance attributed to the notion of simple proof. The main conclusions suggest that the idea of addressing mathematical proof at all levels of school is a recent idea that is not yet fully implemented in schools. It requires an adaptation of the understanding of proof to the age of the students, reducing the level of formality, and allowing the students to experience the different functions of proof and not only the function of verification. Among the different functions of proof, the function of explanation deserves special attention due to the illumination and empowerment that it can bring to the students and their learning. The way this function of proof relates to the notion of simple proof (and the related aesthetic issues) seems relevant enough to make it, in the future, a focus of attention for the teachers who address mathematical proof in the classroom.

Metal content in edible crops and agricultural soils due to intensive use of fertilizers and pesticides in Terras da Costa (Portugal) - Reboredo F., Simões M., Jorge C., Mancuso M., Martinez J., Guerra M., Ramalho J.C., Pessoa M.F., Lidon F. (Environmental Science and Pollution Research, 2019)

Modelling and (Re-)Planning Periodic Home Social Care Services with Loyalty and Non-Loyalty Features - Gomes, Maria Isabel; Ramos, Tania (European Journal of Operational Research, 2019)

A new Ankylosaur Dinosaur Skeleton from the Upper Jurassic of Portugal - Russo, J.; O. Mateus (Journal of Vertebrate Paleontology, Program and Abstracts, 2019)

New ornithopod dinosaur remains from the Late Jurassic Lourinhã Formation - Rotatori, F.; Moreno-Azanza, M.; O. Mateus (17th Conference of the EAVP, 2019)

The notion of function by basic education preservice teachers - Viseu, F.; P. Mendes; Rocha, H. (ATEE Winter Conference ‘Science and mathematics education in the 21st century, 2019)
The current curricular guidelines for mathematics education in Portugal emphasize the relevance of working with different representations of functions to promote understanding. Given this relevance, we seek understanding about the notion of function held by 37 basic education pre-service teachers in their first year of a master’s course. Data were collected through a task focusing on identifying functions in situations based on different representations. The content analysis technique was then adopted in the search for an understanding of the justifications given by the participants. The results achieved suggest it is easier for the pre-service teachers to identify examples that are not functions than examples that are functions. There is also a tendency for greater accuracy in the identification of examples expressed by tables than by algebraic expressions. The justifications presented show a notion of function as a relation between values of two non-empty sets, but without guaranteeing that this relation is single-valued.

O uso de exemplos na demonstração: um estudo com alunos do 11.º ano - Caneco, R.; Rocha, H. (SIEM, 2019)
This article focuses the choice and use of examples by two students of the 11th grade to prove or refute a set of statements. The use of representations of sequences and functions is also considered. The study adopts a qualitative approach and data were collected by interviews and documental gathering. The conclusions suggest most of the examples used were well-known sequences or functions. However, the students sought different purposes for the use of examples, such as understanding the conjecture, demonstrate the falsity or truthfulness of the statement and conveying a general argument. The students made a satisfactory articulation between the various types of representations but relied mostly in the cartesian graph.

A perspectiva de futuros professores sobre a demonstração matemática - Rocha, H. (XV Congresso Internacional Galego-Portugués de Psicopedagogia, 2019)
The mathematical proof is assumed as a central element in the development of Mathematics. However, proof is conceived in different ways and assumed as having different functions in Mathematics. And when we move from mathematics to its teaching, the multiplicity of perspectives becomes even more significant. This diversity can have an impact on the students and on the relationship they establish with Mathematics. In these circumstances, this study seeks knowledge over the perspectives of future teachers regarding the mathematical demonstration. Specifically, it intends to achieve a deeper knowledge over the future teachers’ perspectives about what is a mathematical proof and about its functions. The study adopts a qualitative approach and uses interviews to collect data. The conclusions reached point to a traditional perspective of mathematical proof, closely tied to mathematical formalism and the validation function, where the teaching context introduces some changes, adjusting the formalism to the level of the students and highlighting the understanding function of proof, but maintaining the dominant character of the algebraic language.

Pre-service teachers’ knowledge: impact on the integration of mathematical applications on the teaching of mathematics - Rocha, H. (Science and mathematics education in the 21st century, 2019)
Mathematics is present everywhere. However, uncovering the relevance of Mathematics requires, from the teachers, a special kind of knowledge. This study tries to characterize the knowledge used by pre-service teachers when developing a mathematical task intending to promote the students’ exploration of barcodes. The study adopts a qualitative and interpretative methodology and the data were collected using class observation and interviews. The analysis is guided by the Application and Pedagogical Content Knowledge, a model inspired on TPACK (from Mishra and Koehler) and MKT (from Ball and colleagues). The conclusions point to some difficulties to see the potential of the situation to promote mathematical learning. The knowledge on the mathematical content seems to be dominant on the options assumed and operated in a rigid way that prevent the pre-service teachers from exploring the richness of the situation on the tasks they developed.

Recent Advances in Complex Fluids Modeling - Ferrás, L. L.; M. L. Morgado; M. Rebelo; Leiva, R. T.; Castelo, A.; Mckinley, G. H.; Afonso, A. M. (Fluid Flow Problems, 2019)

Resposta da ligação pilar-laje fungiforme sujeitas a ações horizontais cíclicas reforçadas com estribos - Almeida, André; António Ramos; Marreiros, Rui; Válter Lúcio; Ricardo Faria (2019)

Semi-Analytical Solutions for the Poiseuille-Couette Flow of a Generalised Phan-Thien-Tanner Fluid - Ribau, A. M.; Ferrás, L.; M. L. Morgado; M. Rebelo; A. Afonso (Fluids, 2019)

Sustainable Solid Waste Collection and Management: An Integrated Approach - Pires, Ana; Martinho, Graca; Rodrigues, Susana; Gomes, Maria Isabel (Springer, 2019)
This volume focuses on the collection of waste and waste streams as an integral aspect of sustainable waste management. The authors take economic models and behavioral studies into account to go beyond just descriptions of waste collections technologies and collection route design. Models and tools for sustainable waste collection are described in detail, and the authors provide a comprehensive, integrated methodology to design waste collection systems that reduce environmental impacts, are economically viable, and achieve buy-in and participation from target populations. Part I of the book provides fundamentals and context on waste hierarchy, including waste prevention, reduction and reuse, waste collection itself, and steps such as preparation for recycling, recycling, treatment, and landfilling. Background in environmental, social, and economic concerns surrounding waste collection is also provided here. Part II addresses tools for design, operation, and maintenance of waste collection systems. Part III focuses on how the tools presented in Part II can be used to support sustainability assessments and decisions that consider the entire life cycle of waste and the role of waste collection programs in waste prevention, reduction, reuse, recycling, treatment, and disposal. Part IV addresses the challenges of developing sustainable waste management systems and addresses the role of waste collection in sustainable waste management in the future.

Tourism Gentrification - Lopes, A. C.; Rodrigues, E. B.; Vera-Cruz, R. (IOP Conference Series: Materials Science and Engineering, 2019)

Assessment of SFRC flat slab punching behaviour – part I: monotonic vertical loading - Gouveia, Nuno D.; Faria, Duarte M V; Ramos, António Pinho (Magazine of Concrete Research, 2019)
This paper presents a study of the behaviour and load capacity of steel-fibre-reinforced concrete (SFRC) flat slabs under monotonically increased concentrated vertical loads. The SFRC was used only in the local region of the slab–column connection, as the rest of the slab was cast using normal concrete without fibres. The six experimental test specimens had a thickness of 150 mm with different longitudinal reinforcement ratios, using a non-uniform distribution over the slab width. The concretes used were made with different Dramix 4D 65/60 BG steel fibre contents (0, 0·5, 0·75 and 1·0% volume content). The slab tests were complemented by flexural tests on notched beams. This made it possible to determine the tension behaviour of the different concretes used, through a linear post-cracking behaviour and inverse analysis. The inverse analysis made it possible to define the stress–crack opening relationship that characterises the tension behaviour of SFRC and to relate it to the observed behaviour and load capacity of the tested slabs. The tests results show that the tensile behaviour of the SFRC plays an important role in the behavioural and load capacity of the slabs and that it can be considered relevant to physically based models.
n/a

Assessment of SFRC flat slab punching behaviour – part II: reversed horizontal cyclic loading - Gouveia, Nuno D.; Faria, Duarte M V; Ramos, António Pinho (Magazine of Concrete Research, 2019)
This paper presents an experimental study of four flat slab specimens subjected to combined vertical and horizontal cyclic loading. Steel fibre-reinforced concrete (SFRC) was used only in the local region of the slab–column connection, while the rest of the slabs were cast using normal concrete. The specimens measured 4·15 m × 1·85 m × 0·15 m and were connected to two steel half columns by 0·25 m × 0·25 m rigid steel plates, prestressed against the slab using steel bolts, to ensure monolithic behaviour. The specimens were tested using an innovative test setup system that accounted for important factors, such as the ability of bending moment redistribution, line of inflection mobility and assured equal vertical displacements at the opposite slab borders, and symmetrical shear forces. Results show that the presence of SFRC in the slab–column connection region is effective in increasing the deformation capacity of slab–column connections, allowing the increase of horizontal drift ratios.
n/a

Behavior of thin lightly reinforced flat slabs under concentric loading - Ala Torabian; Isufi, Brisid; Davood Mostofinejad; Ramos, António Pinho (Engineering Structures, 2019)
The current research aims to study the behavior of thin reinforced concrete (RC) slabs under concentrated loads as well as to investigate the application of Critical Shear Crack Theory (CSCT) to such slabs. For this purpose, four square 100-mm-thick slabs were cast and subjected to concentrated punching monotonic loading. The experimental parameters were the flexural reinforcement ratio, 0.38% and 1.00%, and the presence or absence of shear headed stud reinforcement. It is shown that the failure criteria of CSCT describe reasonably well the observed failure modes and the ultimate loads of the specimens. However, attention is brought to some peculiarities in the analytical derivation of the load-rotation curve for thin lightly reinforced flat slabs, in which large deformations are experienced. Results showed that in such slabs, the behavior can be highly influenced by the post-yield stress-strain curve of the flexural steel reinforcement. As a result, the constitutive law of steel reinforcement should be explicitly taken into account in such cases. The versatility of CSCT to adapt to these conditions is demonstrated.
n/a
Keywords: Critical Shear Crack theory; Flexural reinforcement ratio; Post-yield; Punching; Shear headed stud; Thin flat slab

Challenging the Calorimeter CALIFA for FAIR Using High Energetic Photons - Teubig, P; Remmels, P.; Klenze, P.; Alvarez-Pol, H; E. Alves; Boillos, J M; Cabanelas, P; R. C. da Silva; Cortina-Gil, D; Cruz, J.; Ferreira, D; Fonseca, M; et al. (Basic Concepts in Nuclear Physics: Theory, Experiments and Applications, 2019)
n/a
n/a

Comparison of Spiral and Square Coil Configurations in Wireless Power Transfer System for Contactless Battery Charging - Al-Saadi, M.; S Valtchev; Romba, L.; Gon?alves, J.; Cr?ciunescu, A. (2019 Electric Vehicles International Conference, EV 2019, 2019)
n/a
n/a

Crystallography of Lourinhanosaurus eggshells (Dinosauria, Theropoda, Allosauroidea) - M. Moreno Azanza; R. Coimbra; Puértolas-Pascual, E.; Russo, J.; B. Bauluz; O. Mateus (Journal of Vertebrate Paleontology, Program and Abstracts, 2019)
n/a
n/a

Efficiency Improvement in Wireless Power System - Luis Romba; Stan Valtchev (Emerging Capabilities and Applications of Wireless Power Transfer, 2019)
This chapter focuses on mid-range wireless power transfer (WPT) systems applied to electric vehicle (EV) battery chargers. The WPT is recently considered as an efficient electric energy transfer process between two or more points in space, without wiring. The technology associated with each specific process of WPT differs from case to case depending on the distance between those points and the power to be transferred between them. The widely adopted distance categories are named short-range, mid-range, and long-range. The short-range is normally defined as up to a few millimeters range. The mid-range is between a few millimeters and a few meters. The long-range distance is defined as a longer than that of the previous category, stretching up to a few kilometers.
n/a

Electrochemical metallization ReRAMs (ECM) - Experiments and modelling: general discussion - Elia Ambrosi; Philip Bartlett; Alexandra I. Berg; Stefano Brivio; Geoffrey Burr; Sweety Deswal; Deuermeier, Jonas; Masa-aki Haga; Kiazadeh, Asal; Gabriela Kissling; Michael Kozicki; Cina Foroutan-Nejad; et al. (Faraday Discussions, 2019)
n/a
n/a

Electromagnetic Influence of WPT on Human's Health: Modelling, Simulation, and Measurement - Baikova, Elena N.; Luis Romba; Stan Valtchev (Emerging Capabilities and Applications of Wireless Power Transfer, 2019)
The focus of this chapter is the electromagnetic interference (EMI) and the electromagnetic compatibility (EMC) that the wireless power transfer (WPT) systems reveal as problems. The wireless power transfer (WPT) was introduced by Nikola Tesla more than one hundred years ago, and only recently it attracted the attention of specialists, due to the improved technical means. The WPT technology now has many applications, especially for charging of various electronic devices (i.e., mobile phones, laptops, implants, and home appliances), informatics, and electronics equipment. The high-power equipment and installations (e.g., intelligent machining systems, robots, forklift trucks, and electric cars) are also getting wireless. Moreover, much attention has been focused on the electric transportation system for improving the safe and convenient charging of electric vehicle (EV) batteries.
n/a

Exploratory study on geodesic domes under blast loads - H. B. Rebelo; Amarante dos Santos, F; Cismaşiu, C.; Santos, D. (International Journal of Protective Structures, 2019)
n/a
cited By 0

Finite element analysis of punching shear of R/C slabs: A hybrid approach for model calibration - Secci, L.; Teoni, E.; Lapi, M.; Orlando, M.; Ramos, a (Proceedings of the fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures, 2019)
n/a
cited By 0

The Fossil Record of Biodiversity in Angola Through Time: A Paleontological Perspective - Mateus,Octávio; Pedro M. Callapez; Michael J. Polcyn; Anne S. Schulp; António Olímpio Gonçalves; Jacobs,Louis L. (Biodiversity of Angola: Science {&} Conservation: A Modern Synthesis, 2019)
This chapter provides an overview of the alpha paleobiodiversity of Angola based on the available fossil record that is limited to the sedimentary rocks, ranging in age from Precambrian to the present. The geological period with the highest paleobiodiversity in the Angolan fossil record is the Cretaceous, with more than 80{%} of the total known fossil taxa, especially marine molluscs, including ammonites as a majority among them. The vertebrates represent about 15{%} of the known fauna and about one tenth of them are species firstly described based on specimens from Angola.
n/a

Fracture characterization of a cast aluminum alloy aiming machining simulation - TEF Silva; S Gain; D Pinto; A.M.P. de Jesus; J. Xavier; Reis, A.; P. A. R. Rosa (Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications, 2019)
Despite extensive research regarding metal cutting simulation, the current industrial practice very often relies on empirical data when it comes to tool design. In order accurately simulate the cutting process it is not only important to have robust numerical models that closely portray the phenomenon, but also to properly characterize the material taking into account the cutting conditions. The goal of this investigation focuses on the mechanical characterization of the cast aluminum alloy AlSi9Cu3 by conducting both compression and fracture tests. Due to its very good castability, machinability, and attractive mechanical properties, this alloy is widely used in casting industry for the manufacture of automotive components, among others. Besides the experimental characterization, a numerical methodology is proposed for the modeling of the cast alloy, making use of the Johnson–Cook constitutive material model, in Abaqus/CAE. The material model is calibrated based on compression tests at multiple conditions (quasi-static, incremental dynamic and high temperatures). The identified model is then validated by simulation of the ductile fracture tests of notched specimens. The obtained numerical results were consistent with the experimentally obtained, contributing to the validity of the presented characterization technique.
n/a

A new Ankylosaur Dinosaur Skeleton from the Upper Jurassic of Portugal - Russo, J.; O. Mateus (Journal of Vertebrate Paleontology, Program and Abstracts, 2019)
n/a
n/a

On factors affecting CFRP-steel bonded joints - Silva, M. A. G.; Biscaia, H.; Ribeiro, P (Construction and Building Materials, 2019)
Failure of structural steel members strengthened with Carbon Fibre Reinforced Polymers (CFRP) may occur at the joints CFRP-steel and this study examines variables that alter or explain the corresponding reduction of load capacity for a specific CFRP laminate, adhesive and steel. Factors and parameters likely to be influential like surface treatment prior to bonding, the bonded length, the glass transition temperature (Tg) of the adhesive, the exposure to aggressive environment, the temperature at service and different types of loading were examined. The experimental program selected double strap CFRP-steel bonded joints under shear for the analysis. The steel surfaces to be bonded were subjected to sand blasting (6.3 bar) or abrasive grinding (6.9 bar) corresponding to thorough blast cleaning Sa2; surfaces rusted after exposure to salt fog at 35 °C were also considered. Differences detected in responses of specimens treated by sand or steel spheres blasting were relatively minor. Tests made at increasing ambient temperatures confirmed that service temperature near and above adhesive Tg caused rapid deterioration of ultimate capacity and change of failure modes. Salt fog cycles (SF) originated the most significant losses of joint capacity. Application of cyclic static loading above the critical loading threshold obtained for unaged joints did not reduce the capacity of joints previously aged by freeze-thaw. The same cyclic loading after salt fog cycles, reduced bond capacity and increase the ultimate slip, suggesting larger effective length. Despite the losses of capacity, microscopic changes of structural nature could not be identified. © 2019 Elsevier Ltd
cited By 13

Phellem Cell-Wall Components Are Discriminants of Cork Quality in Quercus suber - Pinheiro, Carla; Wienkoop, Stefanie; {de Almeida}, João Feio; Brunetti, Cecilia; Zarrouk, Olfa; Planchon, Sebastien; Gori, Antonella; Tattini, Massimiliano; Ricardo, Candido Pinto; Renaut, Jenny; Teixeira, Rita Teresa (Frontiers in Plant Science, 2019)
Cork is a renewable, non-wood high valued forest product, with relevant ecological and economic impact in the Mediterranean-type ecosystems. Currently, cork is ranked according to its commercial quality. The most valuable planks are chosen for cork stoppers production. Cork planks with adequate thickness and porosity are classified as stoppable quality cork (SQC). The chemical composition of cork is known, but the regulation of metabolic pathways responsible of cork production and composition, hence of cork quality, is largely unknown. Here, we tested the hypothesis that post-genomic events may be responsible for the development of SQC and N-SQC (non-stoppable quality cork). Here, we show that combined proteomics and targeted metabolomics (namely soluble and cell wall bound phenolics) analyzed on recently formed phellem allows discriminate cork planks of different quality. Phellem cells of SQC and N-SQC displayed different reducing capacity, with consequential impact on both enzymatic pathways (e.g., glycolysis) and other cellular functions, including cell wall assembly and suberization. Glycolysis and respiration related proteins were abundant in both cork quality groups, whereas the level of several proteins associated to mitochondrial metabolism was higher in N-SQC. The soluble and cell wall-bound phenolics in recently formed phellem clearly discriminated SQC from N-SCQ. In our study, SQC was characterized by a high incorporation of aromatic components of the phenylpropanoid pathway in the cell wall, together with a lower content of hydrolysable tannins. Here, we propose that the level of hydrolysable tannins may represent a valuable diagnostic tool for screening recently formed phellem, and used as a proxy for the quality grade of cork plank produced by each tree.
Fundacao para a Ciencia e a Tecnologia, Ministerio da Educacao e Ciencia, Portugal (PTDC/AGRAAM/100465/2008). COST action FA1306. JR and SP acknowledge the {"}Fonds National de la Recherche{"} of the Grand Duchy of Luxembourg, project SMARTWALL ref. C15/SR/10240550/SMARTWALL.
Keywords: cell-wall immobilized phenolics; hydrolysable tannins; proteomics; soluble phenolics; targeted metabolomics

Post-earthquake strength and deformation capacity of a flat slab specimen with shear studs - Isufi, B.; Lúcio, V.; Ramos, A. P. (Proceedings of the fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures, 2019)
n/a
cited By 0

Reversed horizontal cyclic loading tests of flat slab specimens with studs as shear reinforcement - Isufi, Brisid; Ramos, António Pinho; Válter Lúcio (Structural Concrete, 2019)
The results of a series of experiments on four reinforced concrete flat slab specimens with shear studs and a control specimen without any shear reinforcement are presented. The specimens were tested under constant gravity loads and reversed horizontal cyclic displacements. The main test variables were the applied gravity load and the number of perimeters of studs. One of the specimens was tested in two phases to study the postearthquake behavior. Results showed a considerable improvement of the deformation capacity of specimens with studs compared to the reference specimen. In agreement with previous research, increasing the applied gravity shear ratio resulted in a lower experimental drift capacity. It is shown that a better explanation of the observed ultimate drifts can be made by considering also the flexural capacity and the extent of shear reinforcement. The specimen tested in two phases exhibited considerable residual capacity, even after severe horizontal loading.
n/a
Keywords: Cyclic loading; Flat slab; gravity load; Punching; shear studs

Static and seismic behaviour of R/C slabs with openings adjacent to columns - Lapi, M.; Orlando, M.; Spinelli, P.; Ramos, a (Proceedings of the fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures, 2019)
n/a
cited By 0

Synaptic and neuromorphic functions: General discussion - Berg, A.I.; Brivio, S.; Brown, S.; Burr, G.; Deswal, S.; Deuermeier, J; Gale, E.; Hwang, H.; Ielmini, D.; Indiveri, G.; Kenyon, A.J.; Kiazadeh, A.; et al. (Faraday Discussions, 2019)
n/a
n/a

A temperature-dependent bond-slip model for CFRP-to-steel joints - Biscaia, H. C.; Ribeiro, P (Composite Structures, 2019)
It is supposed that the adhesively bonded structures would perform well during their lifetime, but the action of high temperatures may affect the initial integrity of the joints, as recognized by some researchers. Still, there are few studies proposing a model to locally predict the interfacial bond behaviour of Carbon Fibre Reinforced Polymers (CFRP) bonded to a steel substrate when subjected to temperature changes. The influence of temperature on CFRP-to-steel bonded joints is, therefore, not very well understood yet and more studies are needed to better understand how these joints behave under such circumstances. The present work aims to contribute to the mitigation of the existing lack of knowledge on the performance of CFRP-to-steel bonded joints under high temperatures. Therefore, an experimental program was considered and specimens were tested at different temperatures: 20 °C, 35 °C, 50 °C, 65 °C, 80 °C, and 95 °C. To help the interpretation of the results, an analytical model is proposed to predict the load capacity of the CFRP-to-steel joints. The local bond-slip behaviour of the tested specimens is also analyzed and, based on a literature review, a temperature-dependent bond-slip model with a bi-linear shape is proposed and implemented into a commercial software based on the Finite Element Method (FEM). © 2019 Elsevier Ltd
cited By 23

Varieties of regular semigroups with uniquely defined inversion - Araújo, João; Kinyon, Michael; Robert, Yves (Port. Math., 2019)
n/a
n/a

{Growth Mechanism of Seed-Layer Free ZnSnO3 Nanowires: Effect of Physical Parameters} - Rovisco, Ana; Branquinho, Rita; Jorge Martins; Fortunato, Elvira; Martins, Rodrigo; Barquinha, Pedro (Nanomaterials, 2019)
ZnSnO3 semiconductor nanostructures have several applications as photocatalysis, gas sensors, and energy harvesting. However, due to its multicomponent nature, the synthesis is far more complex than its binary counter parts. The complexity increases even more when aiming for low-cost and low-temperature processes as in hydrothermal methods. Knowing in detail the influence of all the parameters involved in these processes is imperative, in order to properly control the synthesis to achieve the desired final product. Thus, this paper presents a study of the influence of the physical parameters involved in the hydrothermal synthesis of ZnSnO3 nanowires, namely volume, reaction time, and process temperature. Based on this study a growth mechanism for the complex Zn:Sn:O system is proposed. Two zinc precursors, zinc chloride and zinc acetate, were studied, showing that although the growth mechanism is inherent to the material itself, the chemical reactions for different conditions need to be considered.
n/a
Keywords: growth mechanism; hydrothermal synthesis; nanowires; znsno 3; zto

A Khan Academy em Portugal, o ensino e aprendizagem da Matemática e a Formação de Professores - um contributo da EDUCOM - Freitas, João Correia; Reis, Fernando Egídio; Lopes, Vítor Godinho; Costa, David (Educação e Matemática, 2019)
n/a
n/a

{Quasi-free neutron and proton knockout reactions from light nuclei in a wide neutron-to-proton asymmetry range} - Holl, M; Panin, V; Alvarez-Pol, H; Atar, L; Aumann, T; Beceiro-Novo, S; Benlliure, J; Bertulani, C A; Boillos, J M; Boretzky, K; Caamano, M; Caesar, C; et al. (Physics Letters B, 2019)
Physics Letters B, 795 (2019) 682–688. 10.1016/j.physletb.2019.06.069
n/a

{CHAPTER 2 Structural Elucidation of Macromolecules} - Carvalho, Ana Luísa; Santos-Silva, Teresa; Romão, Maria João; Eurico, J; Marcelo, Filipa (Essential Techniques for Medical and Life Scientists: A Guide to Contemporary Methods and Current Applications with the Protocols, 2018)
n/a
n/a
Keywords: cryo-em; drug design; ligand interactions; macromolecular structure; NMR; protein-; saxs; X-ray crystallography

Salinity effect on germination, seedling growth and cotyledon membrane complexes of a Portuguese salt marsh wild beet ecotype - Pinheiro, C.; Ribeiro, IC; Reisinger, V.; Planchon, S; Veloso, M. M.; Renaut, J; Eichacker, L.; Ricardo, C. P. (Theoretical and Experimental Plant Physiology, 2018)
n/a
n/a

Localization and distribution of Zn and Fe in grains of biofortified bread wheat lines through micro- and triaxial-X-ray fluorescence spectrometry - Cardoso, P; Mateus, T C; Velu, G; R. P. Singh; J P Santos; M. L. Carvalho; Lourenço, V M; Lidon, F; Reboredo, F; M Guerra (Spectrochim. Acta Part B, 2018)
n/a
n/a

Quasifree ($p$, $2p$) Reactions on Oxygen Isotopes: Observation of Isospin Independence of the Reduced Single-Particle Strength - Atar, L; Paschalis, S; Barbieri, C.; Bertulani, C A; D\'ıaz Fernández, P.; Holl, M; Najafi, M A; Panin, V; Alvarez-Pol, H; Aumann, T; Avdeichikov, V.; Beceiro-Novo, S; et al. (Phys. Rev. Lett., 2018)
n/a
n/a

Single human B cell-derived monoclonal anti-Candida antibodies enhance phagocytosis and protect against disseminated candidiasis. - Rudkin, Fiona M; Raziunaite, Ingrida; Workman, Hillary; Essono, Sosthene; Belmonte, Rodrigo; MacCallum, Donna M; Johnson, Elizabeth M; Silva, Lisete M; Palma, Angelina S.; Feizi, Ten; Jensen, Allan; Erwig, Lars P; et al. (Nature communications, 2018)
The high global burden of over one million annual lethal fungal infections reflects a lack of protective vaccines, late diagnosis and inadequate chemotherapy. Here, we have generated a unique set of fully human anti-Candida monoclonal antibodies (mAbs) with diagnostic and therapeutic potential by expressing recombinant antibodies from genes cloned from the B cells of patients suffering from candidiasis. Single class switched memory B cells isolated from donors serum-positive for anti-Candida IgG were differentiated in vitro and screened against recombinant Candida albicans Hyr1 cell wall protein and whole fungal cell wall preparations. Antibody genes from Candida-reactive B cell cultures were cloned and expressed in Expi293F human embryonic kidney cells to generate a panel of human recombinant anti-Candida mAbs that demonstrate morphology-specific, high avidity binding to the cell wall. The species-specific and pan-Candida mAbs generated through this technology display favourable properties for diagnostics, strong opsono-phagocytic activity of macrophages in vitro, and protection in a murine model of disseminated candidiasis.
n/a
Keywords: administration {&} dosage; Animals; Antibodies; B-Lymphocytes; Candida; Candida albicans; Candidiasis; drug effects; Female; Fungal; genetics; Humans; immunology; Inbred BALB C; Mice; microbiology; Monoclonal; Phagocytosis; physiology; prevention {&} control