Export 9208 results:
Sort by: Author Title Type [ Year  (Desc)]
2010
Amaral, A., P. Brogueira, G. Lavareda, and C. Nunes de Carvalho. "On the Role of Tin Doping in InOx Thin Films Deposited by Radio Frequency-Plasma Enhanced Reactive Thermal Evaporation." JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY. 10 (2010): 2713-2716. Abstract

In view of the increasing need for larger-area display devices with improved image quality it becomes increasingly important to decrease resistivity while maintaining transparency in transparent conducting oxides (TCOs). Accomplishing the goal of increased conductivity and transparency will require a deeper understanding of the relationships between the structure and the electro-optical properties of these materials. In this work we study the role of tin doping in InOx thin films. Undoped indium oxide (InOx) and indium tin oxide (ITO) thin films were deposited at room temperature by radio-frequency plasma enhanced reactive thermal evaporation (rf-PERTE), a new technique recently developed in our laboratory using as evaporation source either In rods or a 90%In:10%Sn alloy, respectively. The two most important macroscopic properties-optical transparency and electrical resistivity-seem to be independent of the tin content in these deposition conditions. Results show that the films present a visible transmittance of the order of 82%, and an electrical resistivity of about 8 x 10(-4) Omega . cm. Surface morphology characterization made by atomic force microscopy (AFM) showed that homogeneity of the films deposited from a 90%In:10%Sn alloy is enhanced (a film with small and compact grains is produced) and consequently a smooth surface with reduced roughness and with similar grain size and shape is obtained. Films deposited from pure In rods evaporation source show the presence of aggregates randomly distributed above a film tissue formed of thinner grains.

Parreira, P., G. Lavareda, J. Valente, F. T. Nunes, A. Amaral, and Nunes C. de Carvalho. "Undoped InOx Films Deposited by Radio Frequency Plasma Enhanced Reactive Thermal Evaporation at Room Temperature: Importance of Substrate." JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY. 10 (2010): 2701-2704. Abstract

Conductive and transparent undoped thin films of indium oxide (InOx), 120 nm average thick, were deposited by radio frequency plasma enhanced reactive thermal evaporation (rf-PERTE) of indium in the presence of oxygen at room temperature. Several substrates were used in order to study their influence on the main properties of these films: alkali free (AF) glass, fused silica, crystalline silicon and polyethylene terephthalate (PET). Surface morphology of the InOx films as a function of the substrates was observed by SEM and showed that the undoped InOx films obtained are nano-structured. For the c-Si substrate, InOx films with increased grain size are obtained, induced by the crystalline substrate. Films deposited on fused silica and AF glass substrates show a nano-grainy surface with similar surface morphologies. The InOx films deposited on AF glass show the highest values of both: electrical conductivity of about 1100 (Omega cm)(-1) and visible transmittance of 85%. The substrate has a greater influence on the surface morphology of the films when a polymer (PET) is used. InOx films deposited on PET show a decrease in the electrical conductivity (90 (Omega cm)(-1)) and a slight decrease in the average visible transmittance (78%).

Parreira, P., G. Lavareda, J. Valente, F. T. Nunes, A. Amaral, and C. Nunes de Carvalho. "Undoped InOx Films Deposited by Radio Frequency Plasma Enhanced Reactive Thermal Evaporation at Room Temperature: Importance of Substrate." JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY. 10 (2010): 2701-2704. Abstract

Conductive and transparent undoped thin films of indium oxide (InOx), 120 nm average thick, were deposited by radio frequency plasma enhanced reactive thermal evaporation (rf-PERTE) of indium in the presence of oxygen at room temperature. Several substrates were used in order to study their influence on the main properties of these films: alkali free (AF) glass, fused silica, crystalline silicon and polyethylene terephthalate (PET). Surface morphology of the InOx films as a function of the substrates was observed by SEM and showed that the undoped InOx films obtained are nano-structured. For the c-Si substrate, InOx films with increased grain size are obtained, induced by the crystalline substrate. Films deposited on fused silica and AF glass substrates show a nano-grainy surface with similar surface morphologies. The InOx films deposited on AF glass show the highest values of both: electrical conductivity of about 1100 (Omega cm)(-1) and visible transmittance of 85%. The substrate has a greater influence on the surface morphology of the films when a polymer (PET) is used. InOx films deposited on PET show a decrease in the electrical conductivity (90 (Omega cm)(-1)) and a slight decrease in the average visible transmittance (78%).

Pereira, L., H. Águas, L. Gomes, P. Barquinha, E. Fortunato, and R. Martins. "{Nanostructured Silicon Based Thin Film Transistors Processed in the Plasma Dark Region}." Journal of Nanoscience and Nanotechnology. 10 (2010): 2938-2943. AbstractWebsite
n/a
Josefino, C. J. S., M. T. Santana, M. Vicente da Silva, A. N. Antão, and N. Guerra. "Two-dimensional basal stability of deep excavation in homogeneous clay deposit using upper bound numerical analysis." International Conference in Geotechnical Challenges in Megacities. Moscow, Russia 2010. Abstract

n/a

Santos, João Pedro, Ana Moreira, João Araújo, and Miguel Goulão. "Increasing Quality in Scenario Modelling with Model-Driven Development." 7th International Conference on the Quality of Information and Communications Technology (QUATIC'2010). Eds. Fernando Brito e Abreu, João Pascoal Faria, and Ricardo Machado. Porto, Portugal: IEEE Computer Society, 2010. 204-209. Abstractsantos_et_al_quatic2010.pdf

Models, with different levels of detail, share similar abstractions that can be reused by means of model-driven techniques such as transformations. For example, scenarios are a well-known technique in requirements engineering to represent behavioral flows in a software system. When using UML, scenarios are typically represented with activity models in the early stages of software development, while sequence models are used to describe more detailed object interactions as modeling progresses. This paper defines transformation rules to automate the migration from activity to sequence models. We present a case study illustrating the application of our transformation rules. Our preliminary assessment of the impact of the benefits of using these transformations points to: (i) a reduction of around 50% in the effort building sequence models, (ii) increased trace ability among models, and (iii) error prevention when migrating from different scenario notations.

Vicente da Silva, M., and A. N. Antão. "Parallel computing applied to 3D limit analysis problems: a strategy to achieve highly accurate solutions." NFCOMGEO V - New Frontiers in Computational Geotechnics. Brisbane, Australia 2010. Abstract

n/a

Da Silva, M. S., E. R. Vão, M. Temtem, L. Mafra, J. CALDEIRA, A. Aguiar-Ricardo, and T. Casimiro. "Clean synthesis of molecular recognition polymeric materials with chiral sensing capability using supercritical fluid technology. Application as HPLC stationary phases." Biosensors and Bioelectronics. 25.7 (2010): 1742-1747. AbstractWebsite
n/a
Restani, R. B., VG Correia, V. D. B. Bonifácio, and A. Aguiar-Ricardo. "Development of functional mesoporous microparticles for controlled drug delivery." Journal of Supercritical Fluids. 55.1 (2010): 333-339. AbstractWebsite
n/a
Barroso, T., R. Viveiros, E. Costa, M. Temtem, T. Casimiro, and A. Aguiar-Ricardo. "Development of switchable "smart" biomaterials using an environmental friendly technology." Materials Research Society Symposium Proceedings. Vol. 1220. 2010. 1-6. Abstract
n/a
Barroso, T., M. Temtem, A. Hussain, A. Aguiar-Ricardo, and A. C. A. Roque. "Preparation and characterization of a cellulose affinity membrane for human immunoglobulin G (IgG) purification." Journal of Membrane Science. 348.1-2 (2010): 224-230. AbstractWebsite
n/a
Potecasu, Tiberiu, Elena Drugescu, Octavian Potecasu, and Rui Cordeiro Silva. "ACOUSTIC QUALITY CONTROL SYSTEM FOR CERAMIC PRODUCTS." Metalurgia International. 15.11 (2010): 5-12. Abstract
n/a
Rosa, V., C. I. M. Santos, R. Welter, G. Aullón, C. Lodeiro, and T. Avilés. "Comparison of the structure and stability of new α-diimine complexes of copper(I) and silver(I): Density functional theory versus experimental." Inorganic Chemistry. 49.19 (2010): 8699-8708. AbstractWebsite
n/a
Furtado, M. J., R. J. C. Silva, M. F. Araújo, and F. M. Braz Fernandes. "Composition and microstructures of imperial brass Chinese coins." Materials Science Forum. 636-637 (2010): 531-537. AbstractWebsite
n/a
Ferreira, S. C., A. Velhinho, R. J. C. Silva, and L. A. Rocha. "Corrosion behaviour of aluminium syntactic functionally graded composites." International Journal of Materials & Product Technology. 39.1-2 (2010): 122-135. Abstract
n/a
Monge Soares, Antonio M., Pedro Valerio, Rui JC Silva, Luis Cerqueira Alves, and Maria Fatima de Araujo. "Early Iron Age gold buttons from South-Western Iberian Peninsula. Identification of a gold metallurgical workshop." Trabajos De Prehistoria. 67.2 (2010): 501-510. Abstract
n/a
Bras, Ana, Fernando MA Henriques, and M. T. Cidade. "Effect of environmental temperature and fly ash addition in hydraulic lime grout behaviour." 24.8 (2010): 1511-1517. Abstract
n/a
Cidade, M. T., C. R. Leal, and P. Patrício. "An electro-rheological study of the nematic liquid crystal 4-n-heptyl-4′-cyanobiphenyl." 37.10 (2010): 1305-1311. Abstract
n/a
Cidade, M. T., C. R. Leal, and P. Patrício. "An electro-rheological study of the nematic liquid crystal 4-n-heptyl-4′-cyanobiphenyl." 37.10 (2010): 1305-1311. Abstract
n/a
Marques, Filipe J., Carlos A. Coelho, and Miguel de Carvalho Exact and Near-Exact Distribution of Positive Linear Combinations of Independent Gumbel Random Variables. Departamento de Matemática da Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa e do Centro de Matemática e Aplicações da Universidade Nova de Lisboa, 2010. Abstract

n/a

GONCALVES, G., P. Barquinha, L. Pereira, N. Franco, E. Alves, R. Martins, and E. Fortunato. "High Mobility a-IGO Films Produced at Room Temperature and Their Application in TFTs." Electrochemical and Solid State Letters. 13 (2010): II20-II22. AbstractWebsite
n/a
Valerio, P., R. J. C. Silva, M. F. Araujo, A. M. M. Soares, Braz F. M. Fernandes, L. G. Rosa, and F. Margarido. "Microstructural Signatures of Bronze Archaeological Artifacts from the Southwestern Iberian Peninsula." Advanced Materials Forum V, Pt 1 and 2. 636-637 (2010): 597-604. Abstract
n/a
Mahesh, K. K., Braz F. M. Fernandes, R. J. C. Silva, G. Gurau, M. Kohl, and V. Chernenko. "Phase transformation and structural study on the severely plastic deformed Ni-Ti alloys." 3rd International Symposium on Shape Memory Materials For Smart Systems/e-Mrs 2010 Spring Meeting. 10 (2010): 22-27. Abstract
n/a
Miller, Ana Z., Nuno Leal, Leonila Laiz, Miguel A. Rogerio-Candelera, Rui JC Silva, Amelia Dionisio, Maria F. Macedo, Cesareo Saiz-Jimenez, BJ Smith, M. GomezHeras, HA Viles, and J. Cassar. "Primary bioreceptivity of limestones used in southern European monuments." Limestone in the Built Environment: Present Day Challenges For the Preservation of the Past. 331 (2010): 79-92. Abstract
n/a