Symmetric Models
Mostrando 1-12 de 67 artigos, teses e dissertações.
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1. SPECTROSCOPIC CHARACTERIZATION OF PEDOT:PSS CONDUCTING POLYMER BY RESONANCE RAMAN AND SERRS SPECTROSCOPIES
Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) synthesis was monitored by resonance Raman (RR) and surface-enhanced resonance Raman scattering (SERRS) spectroscopies and both the oxidation of the polymer and the effects of chain length were assessed by vibrational analysis. It was supported by theoretical models of oligomers, with charge
Quím. Nova. Publicado em: 05/12/2019
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2. Flexure Based Energy Dissipating Device in Self-Centering Braces
Abstract Self-centering braces, in the current stage of development can accommodate large deformation and force levels. However, there is still a need for improvement of the energy dissipation mechanisms commonly incorporated in these braces. Yield based energy dissipation systems can overcome some of the problems faced with friction-based devices, such as s
Lat. Am. j. solids struct.. Publicado em: 28/10/2019
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3. AVALIAÇÃO DO PERFIL DE LIBERAÇÃO DO FÁRMACO IBUPROFENO EM MEMBRANAS SIMÉTRICAS E ASSIMÉTRICAS DE ACETATO DE CELULOSE: EFEITO DA MORFOLOGIA
Cellulose derivatives still receive special attention in today biomedical applications due to their biocompatibility, ability to form resistant membranes and compatibility with various bioactive agents. In this work, cellulose acetate (CA) was used to prepare membranes with different morphologies aiming to evaluate the release profile of the drug ibuprofen (
Quím. Nova. Publicado em: 21/10/2019
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4. Investigation of Wedge Water-Entry Under Symmetric Impact Loads by Experimental Tests
Abstract One of the main challenges for engineers in designing high-speed crafts is the evaluation of hydrodynamic loads during the impact of hull to wave’s surface. This paper presents an experimental investigation on the pressure distribution on three wedge-sections with 15°, 20° and 30° deadrise during water-entry. Assessment of pressure distribution
Lat. Am. j. solids struct.. Publicado em: 2017-06
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5. Experimental and numerical investigation of lattice-walled cylindrical shell under low axial impact velocities
Abstract This research was an experimental and numerical investigation of the cylindrical expanded Sheets under impact loading. Two types of absorbers with different cell angles were examined (i.e. α = 0 and α = 90). The experiments were performed using the drop hammer setup, and the numerical simulations were conducted by ABAQUS. In this study, the type o
Lat. Am. j. solids struct.. Publicado em: 2015-10
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6. El campo de las ciencias y la educación superior entre el monopolio del inglés y el plurilingüismo: elementos para una política del lenguaje en América Latina
The field of science and higher education presents a strategic space that clearly reflects some of the problems which spring from the globalisation of English as today's only hyper-central language: from a model of limited plurilingualism based on German, English, and French in the beginning of the XXth century, the field has moved to an almost absolute pred
Trab. linguist. apl.. Publicado em: 2013-12
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7. Simulação de um alimentador Venturi em trecho ascendente no transporte pneumático de sólidos
The radial and axial distributions of coarse solids when fed directly in a riser are unknown, despite this type of feeding is very important for drying and preheating of solids during conveying. In this context, this thesis focused on studying the diluted conveying of coarse solids in a riser that was fed by a Venturi feeder in vertical orientation. Experime
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/08/2012
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8. Transformações em modelos de séries temporais / Transformations in time series models
Cordeiro and Andrade (2009) incorporate the idea of transforming the response variable to the GARMA model, generalized autoregressive moving average, introduced by Benjamin et al. (2003), thus developing the TGARMA model, transformed generalized autoregressive moving average. The goal of this thesis is to develop the TGARMA model introduced by Cordeiro and A
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/05/2012
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9. Uso dos métodos clássico e bayesiano para os modelos não-lineares heterocedásticos simétricos / Use of the classical and bayesian methods for nonlinear heterocedastic symmetric models
Os modelos normais de regressão têm sido utilizados durante muitos anos para a análise de dados. Mesmo nos casos em que a normalidade não podia ser suposta, tentava-se algum tipo de transformação com o intuito de alcançar a normalidade procurada. No entanto, na prática, essas suposições sobre normalidade e linearidade nem sempre são satisfeitas. C
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/06/2011
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10. Método Criptográco Baseado em Autômatos Celulares Bidimensionais para Cifragem de Imagens
This work proposes a new symmetric-key cryptographical model based on von Neumann two-dimensional, heterogeneous and non-additive cellular automata. The encryption process is performed by calculating consecutive pre-images and decryption process by the forward evolution of cellular automata. The proposed model was based on earlier work which used one-dimensi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/12/2010
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11. SIMULATING POTATO TUBER YIELD IN CLIMATE CHANGE SCENARIOS / SIMULAÇÃO DA PRODUTIVIDADE DE TUBÉRCULOS DE BATATA EM CENÁRIOS DE MUDANÇA CLIMÁTICA
Potato (Solanum tuberosum L.), Solanaceae, is ranked fourth in food amount production, exceeded only by wheat, rice and corn. Brazil has potential in climate and soil for growing potatoes, but with a growing concern of society with possible changes in global and regional climate because of anthropogenic increase in greenhouse gases, this crop may be affected
Publicado em: 2010
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12. CorreÃÃo de Bartlett nos modelos nÃo-lineares simÃtricos heteroscedÃsticos
In this work, we treated of refinement of tests of hypotheses in symmetric nonlinear regression heteroskedastic models with link function any for the location and for the scale parameter. We developed, in matrix form, a Bartlettâs corrections factor to the likelihood ratio statistic in this class of models. We present, in matrix form, closed-form expression
Publicado em: 2009