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Nomenclatura Unesco > (33) Ciencias Tecnológicas

Mostrando recursos 121 - 140 de 2,308

121. Computer simulation of the cardiovascular system - L. Sousa; J. Tavares; A. Santos; E. Azevedo; P. Castro; R. Santos

122. Matching Contours in Images using Curvature Information and Optimization based on Dynamic Programming - F. P. M. Oliveira; J. M. R. S. Tavares

123. Caracterización computacional de un detector de germanio hiperpuro de rango extendido (HPGe- XtRa) con simulación Montecarlo y optimización con un algoritmo evolutivo - González Guerra, Jonay
Máster Universitario en Sistemas Inteligentes y Aplicaciones Numéricas en Ingeniería (SIANI)

124. Análisis del comportamiento de los viajeros del transporte interurbano en la isla de Gran Canaria - Cristóbal Betancor, Teresa
Máster Universitario en Sistemas Inteligentes y Aplicaciones Numéricas en Ingeniería (SIANI)

125. Image Processing and Analysis in Biomechanics - tavares, jmrs; jorge, rmn

126. Editorial: Signal Processing in Advanced Nondestructive Materials Inspection - João Manuel RS Tavares; João Marcos A Rebello

127. Continuous dynamic monitoring of bridges: different perspectives of application - Á. Cunha; E. Caetano; C. Moutinho; F. Magalhães

128. Management of research data at Porto University: from research needs to curation workflows supported on a data repository - Maria Eugénia Matos Fernandes; Cristina Ribeiro; João Silva

129. Editorial: Computational Methods for Biomedical Image Processing and Analysis - João Manuel R. S. Tavares; Renato Natal Jorge

The construction sector in Portugal lived booms since the country joined the European Union in 1986 , until the end of the 90s . The beginning of the XXI century coincided with the start of a recession of the Portuguese construction industry, primarily due to decreases in domestic demand for housing and public works. With the current saturation of the domestic market and to the growing phenomenon of globalization, many companies in the industry have oriented their strategies for internationalization and diversification of its activities. The study was conducted through an exchange between Brazilian and Portuguese universities. The main purpose...

131. Improving Face Recognition by Video Spatial Morphing - Armando Padilha; Jorge A. Silva; R. Sebastião

132. Designing environmentally friendly chemical processes with fugitive and open emissions - C.A.V. Costa; D.M. Young; H. Cabezas; R.L. Smith; T.M. Mata

133. Revistas usadas por los investigadores de ciencias de la información de Brasil para publicar y su visibilidad en las bases de datos Web of Science y Scopus - Vieira Pinheiro, Liliane; Silva, Edna Lúcia da; Schwarz Rodrigues, Rosangela
Introducción: la producción es parte esencial de la actividad científica y su visibilidad es un indicador para evaluar la ciencia. Las revistas científicas se han transformado y el movimiento de acceso abierto ha impulsado cambios en el modelo de comunicación científica. Objetivo: el objetivo de este estudio es analizar las revistas que utilizan los investigadores de ciencias de la información de Brasil para publicar y su visibilidad en las bases de datos Web of Science y Scopus, comparando las publicaciones con acceso abierto y acceso restringido. Metodología: investigación cuantitativa, exploratoria y documental que tiene como corpus de análisis la producción...

Em sua quarta edição, as Feiras de Ensino e Popularização da Ciência e de Inovação Tecnológica apresentam à comunidade em geral trabalhos de estudantes, como projetos de pesquisa e produções técnico-científicas e artístico-culturais.

135. Structural anisotropy by static compaction
Induced anisotropy can be applied to soils in different ways, in natural or in laboratory conditions. The aim of this work was to study the effect of load compaction in a specific remoulded residual soil from granite, especially in terms of its effect on the critical state behaviour and isotropic compression. For that purpose, isotropic compression tests and triaxial compression tests were performed up to high pressures in specimens compacted in two different ways: by moist tamping or by multi-layer heavy static compaction imposed by a load frame. The results indicated that isotropic consolidation to high pressures can minimize the...

136. Stiffness and strength governing the static liquefaction of tailings - Fernando Schnaid; Jucélia Bedin; António Joaquim Pereira Viana Da Fonseca; Leandro Costa-Filho
In this study, the behavior of gold tailings is evaluated by a series of drained and undrained triaxial tests carried out in compression and extension and sheared under monotonic loading, allowing the critical state line (CSL) to be established. The observed highly nonlinear shape of the CSL under undrained loading was used to investigate the mechanics of tailings that were dictated by state transitions captured by both the state parameter and the measured values of shear-wave velocities. The definition of a zone is where state conditions may develop strain hardening (stable zone) or strain softening with high compressibility while maintaining...

137. Influence of grain size and mineralogy on the porosity/cement ratio - Sara Silva; António Joaquim Pereira Viana Da Fonseca; Nilo Consoli; Márcio Floss; Nuno Cristelo
The porosity/cement ratio is defined as the ratio between porosity and the volumetric cement content (volume of cement over the total volume) and it is often adjusted by an exponent (#958;) to the volumetric cement content (n/Civ#958;) which seems to depend on the type of soil. This ratio is very useful to analyse artificially cemented soils and it depends on easily calculated moulding properties. Although there are already some results regarding the correlation of this ratio with the mechanical behaviour of different soils, a theory explaining the variation of its exponent (#958;) has yet to be established. In thispaper the...

138. Indexation of dynamic and static geomechanical properties of a cemented aggregate for transportation engineering - António Joaquim Pereira Viana Da Fonseca; Miguel Amaral; Antonio Fabrizio Panico; Sara Silva
This paper presents an extensive experimental program aiming to the mechanical characterisation of an aggregate stabilised with cement. This geomaterial is the product of a quarry of limestone located in north region of Portugal. The aggregate is often used in current subgrading of infrastructures for transportation, namely in railway lines. Complementary, aggregatecement admixtures are used for transition zones, such as in between deformable embankments on soft grounds lining on rigid structures, such as bridgesfounded on deep foundations, such as piles or similar. The demand for smooth transition between diverse stiffness zones implies an optimization of the composition of the enriched...

139. Fatigue cyclic tests on artificially cemented soil
Artificially cemented soils are frequently used in the infrastructural layers of road or railway platforms but the durability of these structures is often questioned when subjected to cyclic loads. In order to evaluate the fatigue behavior, this paper presents long cyclic triaxial tests over several soil cement mixtures using a very well graded silty sand and Portland cement. In undrained cemented tests, pore pressure decreased as a sign of plastic degradation, resulting that the effective stresses rose during the tests. For that reason, the resilient moduli were normalized to the effective stress, revealing a clear drop on the normalized resilient...

140. Isotropic yielding of unsaturated cemented silty sand - Marcos Arroyo; Miguel Amaral; Enrique Romero; António Joaquim Pereira Viana Da Fonseca
Unsaturated cemented soils are frequent both as designed materials and as naturally occurring layers. Both desiccation and cementation act separately as hardening mechanisms, but it is not clear how exactly their effects combine. Do they enhance one another? Are they mutually reinforcing? This study presents results from an experimental campaign aimed at answering these questions. Five different mixtures of soil (a granite saprolite) and cement (with cement contents in the range 0% to 7% on a dry weight basis) are tested in isotropic compression at four different water content levels. Initial void ratio is also controlled, using two initial compaction...

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