Couplings
Mostrando 1-12 de 168 artigos, teses e dissertações.
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1. (+)-BINOL and Pure Shift Experiment: A Bidirectional Approach for NMR Chiral Discrimination of Overcrowded Spectra of Primary Amines
In this work, enantiopure 1,1’-bi-2-naphthol (BINOL) derivatives and carboxylic acids were evaluated as chiral solvating agents (CSAs) in the nuclear magnetic resonance (NMR) chiral discrimination of primary amines. Among the CSAs screened, the readily available (+)-BINOL revealed a simple and rapid chiral auxiliary for 1H NMR chiral discrimination. The pr
J. Braz. Chem. Soc.. Publicado em: 2018-08
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2. A Direct Approach for Coupling Matrix Synthesis for Coupled Resonator Diplexers
Abstract Diplexers are used to separate or combine two bands of frequencies and they are designed by combining channel filters using distribution circuit or alternatively designed based on coupled resonator circuits. Design parameters of coupled resonator circuits such as coupling coefficients, self-resonant frequencies and external couplings are done using
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-12
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3. Substrate Integrated Waveguide (SIW) Bandpass Filter with Novel Microstrip-CPW-SIW Input Coupling
Abstract A Substrate integrated waveguide bandpass filter is presented with a novel CPW-to-SIW transition at both the input and output ports which also served as the input and output couplings into the filter. The CPW-to-SIW transition structures presented here exploited the step impedance between the 50 ohms input/output feedline and the transition to contr
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-04
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4. A Timoshenko Piezoelectric Beam Finite Element with Consistent Performance Irrespective of Geometric and Material Configurations
Abstract The conventional Timoshenko piezoelectric beam finite elements based on First-order Shear Deformation Theory (FSDT) do not maintain the accuracy and convergence consistently over the applicable range of material and geometric properties. In these elements, the inaccuracy arises due to the induced potential effects in the transverse direction and ine
Lat. Am. j. solids struct.. Publicado em: 2016-05
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5. Geometrically nonlinear analysis of thin-walled laminated composite beams
Abstract The use of thin-walled composite beams in Engineering has attracted great interest in recent years. Composite beams and other structural elements tend to have thin walls due to the high strength of the material. Other important aspect is that, even without reaching large strains and without overcoming the elastic limit of the material, such as beams
Lat. Am. j. solids struct.. Publicado em: 2015-11
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6. EFFECTS OF SOLVENT, BASE, AND TEMPERATURE IN THE OPTIMISATION OF A NEW CATALYTIC SYSTEM FOR SONOGASHIRA CROSS-COUPLING USING NCP PINCER PALLADACYCLE
The optimisation of a new catalyst system using NCP pincer palladacycle
1 was investigated using the experimental design technique. NCP pincer palladacycle1 was previously investigated in Suzuki-Miyaura and Heck-Mizoroki cross-couplings and found to be a highly efficient catalyst precursor. In this study, the effects of the typeQuím. Nova. Publicado em: 2015-06
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7. An efficient coupled polynomial interpolation scheme to eliminate material-locking in the Euler-Bernoulli piezoelectric beam finite element
The convergence characteristic of the conventional two-noded Euler-Bernoulli piezoelectric beam finite element depends on the configuration of the beam cross-section. The element shows slower convergence for the asymmetric material distribution in the beam cross-section due to 'material-locking' caused by extension-bending coupling. Hence, the use of convent
Lat. Am. j. solids struct.. Publicado em: 2015-01
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8. Estudo analítico de sistemas de Heisenberg bidimensionais dopados e com acoplamentos anisotrópico e biquadrático / Analytical study of bidimensional Heisenberg systems doped and with anisotropic and biquadratic couplings
No trabalho desenvolvido estudamos alguns modelos magnéticos por meio de duas abordagens diferentes. Nos dois primeiros foi usada a aproximação contínua para o antiferro-magnetismo dada pelo modelo sigma não-linear O(3) (MSNL). Tal modelo é semelhante à teoria de Yang-Mills e possui como soluções configurações de origem topológica, os chamados sk
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/12/2011
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9. SISTEMATIZAÇÃO DE CONHECIMENTO PARA O PROJETO DE PLATAFORMAS DE COLHEITA DE FEIJÃO / KNOWLEDGE SYSTEMATIZATION FOR THE DESIGN OF HARVEST HEADERS OF BEANS
Due to the need to increase in production and to the high rates of losses in the header because of machines with low efficiency in harvesting, it is presented, in this thesis the knowledge systematization needed to develop new header designs to harvest beans. This work presents the machines used for the harvest of beans, the harvesting systems, and a list of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/09/2011
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10. Zeros de Fisher e aspectos críticos do modelo de Ising dipolar / Fisher\ s zeros and critical aspects of the dipolar Ising model
We study the critical behavior of the dipolar Ising model on two-dimensional regular lattices. This model presents a phenomenologically rich scenario due to the effect of frustration caused by the competition between the pure Ising interaction and the dipolar one. To study the criticality of this model we apply finite size scaling relations for the partition
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/06/2011
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11. Análise global de um sistema de refrigeração industrial / Global analysis of a industrial refrigeration system
Este trabalho aborda a análise global de um sistema de refrigeração industrial para produção e envase de bebidas. O sistema foi simulado em uma planilha Excel levando em conta todos os acoplamentos entre os componentes que o compõe, com o intuito de verificar a influência das variações nas temperaturas e pressões na temperatura final da bebida. Foi
Publicado em: 2011
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12. 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