Export 865 results:
Sort by: Author Title Type [ Year  (Desc)]
2010
Neagu, E. R., C. J. Dias, M. C. Lanca, R. Igreja, P. Inacio, J. N. Marat-Mendes, and Ieee. "The Study of the Molecular Movements in the Range of Glass Transition by the Final Thermally Stimulated Discharge Current Technique." Proceedings of the 2010 Ieee International Conference on Solid Dielectrics. IEEE International Conference on Solid Dielectrics-ICSD. 2010. Abstract

The electrical methods used to study the molecular movements are based on the movement of the dipoles under DC or AC electric field. We have proposed recently a combined measuring protocol to analyze charge injection/extraction, transport, trapping and de-trapping in polar or non-polar dielectric materials. The method is used here to analyze the molecular movements in polyimide in the temperature range from 293 to 572 K. A strong relaxation was observed around 402 K and a very weak relaxation around 345 K. This is the beta relaxation which is quite complex. As concern the behavior at high temperatures, above the beta relaxation, a high peak was observed that shifts continuously to higher temperatures as the charging temperature and/or the charging field increase. The maximum current of the peak increases and the temperature corresponding to the maximum current increases as the charging temperature and/or the charging field increase, given a direct observation of the so called cross-over effect related to current decay for sample charged at high fields and/or high temperatures.

Neagu, E. R., C. J. Dias, M. C. Lanca, R. Igreja, P. Inacio, J. N. Marat-Mendes, and Ieee. "The Study of the Molecular Movements in the Range of Glass Transition by the Final Thermally Stimulated Discharge Current Technique." Proceedings of the 2010 Ieee International Conference on Solid Dielectrics. IEEE International Conference on Solid Dielectrics-ICSD. 2010. Abstract
n/a
Carvalho, H., and V. Cruz-Machado. "A Supply Chain Mapping Framework for Resilience Modeling." 17th International Annual {EurOMA} Conference. Porto, Portugal 2010. Abstract
n/a
Carvalho, H., S. G. Azevedo, and V. Cruz-Machado. "Supply chain performance management: lean and green paradigms." International Journal of Business Performance and Supply Chain Modelling. 2 (2010): 304-333. AbstractWebsite

Supply chain management ({SCM)} is crucial for increasing organisational effectiveness, enhancing competitiveness, customer service and profitability. Actually, the lean and green philosophies have been adopted in the {SCM} context, but nearly always separately and with little understanding of their influence on supply chain performance. Accordingly, this paper intends to propose a conceptual model that explores the relationships between lean and green practices and supply chain performance. A set of lean and green {SCM} practices and a performance measurement system are suggested. The proposed performance measures intend to evaluate the practices influence on operational, economic and environmental supply chain's performance.

Ortigueira, M. D., and FJ Coito. "System initial conditions vs derivative initial conditions." Computers & Mathematics with Applications. 59 (2010): 1782-1789. Abstract
n/a
2009
Pereira, Luis, Pedro Barquinha, Goncalo Goncalves, Anna Vila, Antonis Olziersky, Joan Morante, Elvira Fortunato, and Rodrigo Martins. "Sputtered multicomponent amorphous dielectrics for transparent electronics." Physica Status Solidi a-Applications and Materials Science. 206 (2009): 2149-2154. AbstractWebsite
n/a
Moniz, António B. "Synthesis about a collaborative project on “Technology Assessment of Autonomous Systems”." Enterprise and Work Innovation Studies. 5 (2009): 83-91. AbstractWebsite

The project started in 2009 with the support of DAAD in Germany and CRUP in Portugal under the “Collaborative German-Portuguese University Actions” programme. One central goal is the further development of a theory of technology assessment applied to robotics and autonomous systems in general that reflects in its methodology the changing conditions of knowledge production in modern societies and the emergence of new robotic technologies and of associated disruptive changes. Relevant topics here are handling broadened future horizons and new clusters of science and technology (medicine, engineering, interfaces, industrial automation, micro-devices, security and safety), as well as new governance structures in policy decision making concerning research and development (R&D).

Mateus, O. "The sauropod dinosaur Turiasaurus riodevensis in the Late Jurassic of Portugal." Journal of Vertebrate Paleontology. 29 (2009): 144A. Abstractmateus_2009_sauropod_dinosaur_turiasaurus_portugal_svp09abstractspdf.pdfWebsite

A partial sauropod was found in 1996 in Vale Pombas, north of Lourinhã, Central West of Portugal, in the Lourinhã Formation, top of Amoreira Porto Novo member dated as c. 150 M.a. (Early Tithonian, Late Jurassic) and is currently housed at Museum of Lourinhã, in Portugal. The specimen (ML368) comprises a complete tooth with root, anterior chevron and almost complete right forelimb including partial scapula, complete coracoid, humerus, ulna, radius, metacarpals I, III and V, phalanx, and ungual phalanx I. It can be ascribed to Turiasaurus riodevensis, which was previously described from the Villar del Arzobispo
Formation at Riodeva (Teruel, Spain). Characters shared with T. riodevensis holotype include: curvature and asymmetry of tooth crown, expansion of crown, outline of humerus, medial deflection of the proximal end of humerus, shape and prominence of deltopectoral crest, vertical ridge in the distal half of the ulna (considered as diagnostic of Turiasauria), configuration of metacarpals, and bone proportions. It differs from T. riodevensis holotype by the smaller size and the more rectangular ungual phalanx in lateral view. The sediments from which the Riodeva specimen was recovered were previsouly thought to be Tithonian to Berriasian in age. The presence of this species in Portugal, in beds confidently dated as Early
Tithonian, may allow a more precise date for the Riodeva type locality of early Tithonian in age. The humerus of the Portuguese T. riodevensis is 152 cm long. Although shorter than the Spanish specimen (790 mm), it represents a large individual. All adult sauropods recovered in Portugal thus far are very large individuals: Dinheirosaurus (estimated body length is 20-25 m), Lusotitan (humerus length estimated to be 205 cm), Lourinhasaurus (femur length: 174 cm), and Turiasaurus here reported. The lack of of small or medium adult body-size sauropods in the Late Jurassic of Portugal, suggests browsing niches thought to be occupied by smaller forms, could be have been available for other dinosaurs, like the long necked stegosaur Miragaia longicollum.

R, Jardim-Goncalves, and Grilo A. "SOA4BIM: Putting the building and construction industry in the Single European Information Space." Automation in Construction. 19 (2009): 388-397. AbstractWebsite
n/a
António, Grilo, Pais A., and Gonçalves A. "Strategic Management of Public Administration: Applying Complex and Evolutionary Theories." N/A. 2009. 55-64. Abstract
n/a
Neagu, E. R., C. J. Dias, MC Lança, and J. N. Marat-Mendes. "The study of molecular movements in dielectrics using isothermal and non- isotehermal current measurements." 183 (2009): –-. Abstract
n/a
C, Henriques, Vidinha R, Botequim D, Borges JP, and Silva JAMC. "A Systematic Study of Solution and Processing Parameters on Nanofiber Morphology Using a New Electrospinning Apparatus." JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY. 9 (2009): 3535-3545. Abstract
n/a
Martins, Rodrigo, P. Barquinha, L. Pereira, N. Correia, G. GONCALVES, I. Ferreira, and E. Fortunato. "Selective floating gate non-volatile paper memory transistor." Physica Status Solidi-Rapid Research Letters. 3 (2009): 308-310. AbstractWebsite
n/a
Temtem, M., L. M. C. Silva, P. Z. Andrade, F. dos Santos, C. L. da Silva, J. M. S. Cabral, M. M. Abecasis, and A. Aguiar-Ricardo. "Supercritical CO2 generating chitosan devices with controlled morphology. Potential application for drug delivery and mesenchymal stem cell culture." Journal of Supercritical Fluids. 48.3 (2009): 269-277. AbstractWebsite
n/a
Martins, Rodrigo, Luis Pereira, Pedro Barquinha, Goncalo Goncalves, Isabel Ferreira, Carlos Dias, N. Correia, M. Dionisio, M. Silva, Nuno Correia, and Elvira Fortunato. "Self-sustained n-Type Memory Transistor Devices Based on Natural Cellulose Paper Fibers." Journal of Information Display. 10 (2009): 149-157. AbstractWebsite
n/a
Agostinho, M., V. Rosa, T. Avilés, R. Welter, and P. Braunstein. "Synthesis and characterization of Co and Ni complexes stabilized by keto- and acetamide-derived P,O-type phosphine ligands." Journal of the Chemical Society. Dalton Transactions.5 (2009): 814-822. AbstractWebsite
n/a
Mateus, Octávio. "The sauropod Turiasaurus riodevensis in the Late Jurassic of Portugal." Journal of Vertebrate Paleontology. 29 (2009): 144A. Abstract

THE SAUROPOD DINOSAUR TURIASAURUS RIODEVENSIS IN THE LATE JURASSIC OF PORTUGAL MATEUS, Octávio, New University of Lisbon (CICEGe-FCT) & Museum of Lourinhã, Lisboa, Portugal A partial sauropod was found in 1996 in Vale Pombas, north of Lourinhã, Central West of Portugal, in the Lourinhã Formation, top of Amoreira Porto Novo member dated as c. 150 M.a. (Early Tithonian, Late Jurassic) and is currently housed at Museum of Lourinhã, in Portugal. The specimen (ML368) comprises a complete tooth with root, anterior chevron and almost complete right forelimb including partial scapula, complete coracoid, humerus, ulna, radius, metacarpals I, III and V, phalanx, and ungual phalanx I. It can be ascribed to Turiasaurus riodevensis, which was previously described from the Villar del Arzobispo Formation at Riodeva (Teruel, Spain). Characters shared with T. riodevensis holotype include: curvature and asymmetry of tooth crown, expansion of crown, outline of humerus, medial deflection of the proximal end of humerus, shape and prominence of deltopectoral crest, vertical ridge in the distal half of the ulna (considered as diagnostic of Turiasauria), configuration of metacarpals, and bone proportions. It differs from T. riodevensis holotype by the smaller size and the more rectangular ungual phalanx in lateral view. The sediments from which the Riodeva specimen was recovered were previsouly thought to be Tithonian to Berriasian in age. The presence of this species in Portugal, in beds confidently dated as Early Tithonian, may allow a more precise date for the Riodeva type locality of early Tithonian in age. The humerus of the Portuguese T. riodevensis is 152 cm long. Although shorter than the Spanish specimen (790 mm), it represents a large individual. All adult sauropods recovered in Portugal thus far are very large individuals: Dinheirosaurus (estimated body length is 20- 25 m), Lusotitan (humerus length estimated to be 205 cm), Lourinhasaurus (femur length: 174 cm), and Turiasaurus here reported. The lack of of small or medium adult body-size sauropods in the Late Jurassic of Portugal, suggests browsing niches thought to be occupied by smaller forms, could be have been available for other dinosaurs, like the long necked stegosaur Miragaia longicollum.

Yoshida, Nobuko, Vasco T. Vasconcelos, Hervé Paulino, and Kohei Honda. "Session-Based Compilation Framework for Multicore Programming." Frank S. de Boer and Marcello M. Bonsangue and Eric Madelain ed. Vol. 5751. Lecture Notes in Computer Science, 5751. Springer Berlin Heidelberg, 2009. 226-246. Abstract
n/a
C. Silva, J. Castro, J. Araújo, A. Moreira, and F. Alencar. "Support for aspectual modeling to Multiagent system architecture." Aspect-Oriented Requirements Engineering and Architecture Design, ICSE workshop. IEEE, 2009. 38-43. Abstract

n/a

Paulino, Hervé, and Carlos Tavares. "SeDeUse: A Model for Service-oriented Computing in Dynamic Environments." Mobile Wireless Middleware, Operating Systems and Applications. Second International Conference, Mobilware 2009, Berlin, Germany, April 28-29, 2009. Ed. Carlo; Magedanz Thomas Bonnin, Jean-Marie; Giannelli. Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engi. Springer-Verlag, 2009. 157-170. Abstract
n/a
Caeiro, Frederico, and M.Ivette Gomes. "Semi-parametric second-order reduced-bias high quantile estimation." Test. 18 (2009): 392-413. Abstract

{Summary: In many areas of application, like, for instance, climatology, hydrology, insurance, finance, and statistical quality control, a typical requirement is to estimate a high quantile of probability $1 - p$, a value high enough so that the chance of an exceedance of that value is equal to $p$, small. The semi-parametric estimation of high quantiles depends not only on the estimation of the tail index or extreme value index $\gamma $, the primary parameter of extreme events, but also on the adequate estimation of a scale first order parameter. Recently, apart from new classes of reduced-bias estimators for $\gamma >0$, new classes of the scale first order parameter have been introduced in the literature. Their use in quantile estimation enables us to introduce new classes of asymptotically unbiased high quantiles' estimators, with the same asymptotic variance as the (biased) ``classical'' estimator. The asymptotic distributional properties of the proposed classes of estimators are derived and the estimators are compared with alternative ones, not only asymptotically, but also for finite samples through Monte Carlo techniques. An application to the log-exchange rates of the Euro against the Sterling Pound is also provided.}

Barbosa, Fernanda Similarity-based retrieval in high dimensional data with Recursive Lists of Clusters: a study case with Natural Language Dictionaries. Proceedings of the International Conference on Information management and engineering (ICIME ). Kuala Lumpur, Malaysia, 2009.
Ramos, Luís, Manuel L. Esquível, João T. Mexia, and João L. Silva. "Some Asymptotic Expansions and Distribution Approximations outside a CLT Context." Proceedings of 6th St. Petersburg Workshop on Simulation. 1. 2009. 444-448. Abstract
Some asymptotic expansions non necessarily related to the central limit theorem are discussed. After observing that the smoothing inequality of Esseen implies the proximity, in the Kolmogorov distance sense, of the distributions of the random variables of two random sequences satisfying a sort of general asymptotic relation, two instances of this observation are presented. A first example, partially motivated by the the statistical theory of high precision measurements, is given by a uniform asymptotic approximation to $(g(X+ μ_n))_{n ın \mathbbm{N}}$, where $g$ is some smooth function, $X$ is a random variable having a moment and a bounded density and $(μ_{n})_{n ın \mathbbm{N}}$ is a sequence going to infinity; the multivariate case as well as the proofs and a complete set of references will be published elsewhere. We next present a second class of examples given by a randomization of the interesting parameter in some classical asymptotic formulas, namely, a generic Laplace's type integral, by the sequence $(μ_n X)_{n ın \mathbbm{N}}$, $X$ being a Gamma distributed random variable. Finally, a simulation study of this last example is presented in order to stress the quality of asymptotic approximations proposed.
Salema, Maria Isabel Gomes, Ana Paula Barbosa Póvoa, and Augusto Q. Novais. "A strategic and tactical model for closed-loop supply chains." OR Spectrum. 31 (2009): 573-599. AbstractWebsite

In this paper, a strategic location-allocation model is developed for the simultaneous design of forward and reverse supply chains. Strategic decisions such as network design are accounted for together with tactical decisions, namely, production, storage and distribution planning. The integration between strategic and tactical decisions is achieved by considering two interconnected time scales: a macro and a micro time. At macro level, the supply chain is designed in order to account for the existing demands and returns, whose satisfaction is planned simultaneously at the micro level where tactical decisions are taken. A Mixed Integer Linear Programming formulation is obtained which is solved to optimality using standard Branch & Bound techniques. Finally, the model accuracy and applicability is illustrated through the resolution of a case study.