Non Linear Properties
Mostrando 37-48 de 223 artigos, teses e dissertações.
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37. Efeito de agentes de compatibilização em blendas de PS/EPDM
This dissertation describes a study about the toughening of polystyrene with EPDM to obtain higher photooxidative properties and a good balance of impact and tensile properties in comparison to commercial HIPS. Linear triblock copolymers SEBS or SBS were used as compatibilizers to obtain better properties. PS/SBS and PS/SEBS blends were also prepared to inve
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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38. Optimization of laminated composite plates and shells using genetic algorithms, neural networks and finite elements
Structural optimization using computational tools has become a major research field in recent years. Methods commonly used in structural analysis and optimization may demand considerable computational cost, depending on the problem complexity. Therefore, many techniques have been evaluated in order to diminish such impact. Among these various techniques, Art
Latin American Journal of Solids and Structures. Publicado em: 2011
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39. Transições de fase hádron-quark em estrelas de nêutrons
Recent advances on the field of high energy physics have enabled the study of matter under extreme conditions and, in this context, new states of matter are being discovered and speculated upon. Among these hypothetical states of matter is the one of deconfined quarks in high densities and/or temperatures. An environment with extreme densities and low temper
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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40. Teste e comparação de modelos matemáticos para o traçado de curvas granulométricas.
RESUMO: O conhecimento sobre a distribuição granulométrica de partículas sólidas é essencial para as áreas de material de construção, mecânica dos solos, física dos solos, hidrossedimentologia, entre outras. Em geral, as técnicas utilizadas para a avaliação da distribuição granulométrica de amostras resultam em valores pontuais, dependendo d
Planaltina. Publicado em: 2011
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41. 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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42. Simulações Monte Carlo de integrais de trajetória : propriedades elásticas do 4He sólido / Path integrals Monte Carlo simulations : elastic properties of 4He
The path-integral Monte Carlo (PIMC) method is a sophisticated approach for the simulation of many-body quantum systems. In particular, it has been extensively used for the study of manybody bosonic systems such as 4He. The main objective of the present dissertation is to apply the PIMC method to determine the elastic constants of solid 4He in its hcp phase.
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/11/2010
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43. Efeito fotoiniciador sobre propriedades físicas, mecânicas e térmicas de compósitos experimentais fotoativados por luz de lâmpada halógena e LEDs / Effect of the photo-initiator on physical, mechanics and thermal properties of experimental composites photo-activated for halogen lamp and LEDs
The aim of this study was to analyze the spectrum of different lightcuring units (LCUs) and photo-initiators and yours influence in the physical and thermal properties and bond strength (BS) of experimental resin composites with different photo-initiators. A blend with BisGMA, UDMA, BisEMA, TEGDMA and 65 wt% of silanated filler particles was prepared with CQ
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/08/2010
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44. Modelos não lineares sob a classe de distribuições misturas da escala skew-normal / Nonlinear models based on scale mixtures skew-normal distributions
Neste trabalho estudamos alguns aspectos de estimação e diagnóstico de influência global e local de modelos não lineares sob a classe de distribuição misturas da escala skew-normal, baseado na metodologia proposta por Cook (1986) e Poon &Poon (1999). Os modelos não lineares heteroscedásticos também são discutidos. Esta nova classe de modelos const
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/07/2010
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45. Propriedades Ãpticas dos vidros Er3+:PbPO4 / Optical Properties of the Er3+:PbPO4 Glasses
In this work we employ several techniques to investigate the optical properties of moderately high Er3+-doped lead phosphate (EDLP) glasses. The third-order optical susceptibility, χ3, and dispersion of the linear refractive index, n0(λ), of Er3+:PbPO4 were measured in the wavelength range between 400 and 1940 nm by using the spectrally resolved fe
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/07/2010
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46. Determinação experimental e modelagem de temperatura de ebulição e pH de sistemas binarios contendo compostos presentes em sucos de frutas / Experimental determination and modeling of boiling pont pH of binary systems containing fruit juice compunds
The vapor-liquid equilibrium of binary aqueous solutions of D-glucose and D-fructose, present in fruit juices, was evaluated by experimental boiling point measurements in a rotary evaporator with total reflux of the vapor phase from 20 kPa to atmospheric pressure (93.6 kPa) and concentration from 10 to 60 % by mass. The experimental data were correlated with
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/04/2010
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47. Development and characterization of highly oriented PAN nanofiber
A simple and non-conventional electrospinning technique was employed for producing highly oriented Polyacrylonitrile (PAN) nanofibers. The PAN nanofibers were electrospun from 14 wt% solution of PAN in dimethylformamid (DMF) at 11 kv on a rotating drum with various linear speeds from 22.5 m/min to 67.7 m/min. The influence of take up velocity was investigate
Brazilian Journal of Chemical Engineering. Publicado em: 2010-12
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48. Spectral properties of the preconditioned AHSS iteration method for generalized saddle point problems
In this paper, we study the distribution on the eigenvalues of the preconditioned matrices that arise in solving two-by-two block non-Hermitian positive semidefinite linear systems by use of the accelerated Hermitian and skew-Hermitian splitting iteration methods. According to theoretical analysis, we prove that all eigenvalues of the preconditioned matrices
Computational & Applied Mathematics. Publicado em: 2010-06