Resonance Integral
Mostrando 1-12 de 41 artigos, teses e dissertações.
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1. RING CURRENT IN ANTHRACENE AND PHENANTHRENE: CORRECTION TO HÜCKEL PARAMETERS
Excessive degeneracy in the ground state of the π-electron energy levels of anthracene was removed using the Hückel method by correcting the Coulomb integral of the four central carbon atoms. A further correction to the resonance integral was proposed based on the ring-current model, which describes the π-ring current flow along the molecule’s perimeter
Química Nova. Publicado em: 2022
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2. Dynamic analysis and vibration control of a multi-body system using MSC Adams
AbstractIn this paper, modelling and simulation of a multi-body system for its vibration control using sensors and actuators is presented. The model developed on MSC ADAMS consists of six legs connecting moving and base plates using spherical joints with axial rotation of legs constrained. It contains linear actuator collocated with force sensor. Mathematica
Lat. Am. j. solids struct.. Publicado em: 2015-08
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3. Transverse Motions of Rectangular Plates Resting on Elastic Foundation and Under Concentrated Masses Moving at Varying Velocities
AbstractThis study concerns the dynamic characteristics of a prestressed isotropic, rectangular plate continuously supported by an elastic foundation and carrying accelerating mass M. Closed form solutions of the governing fourth order partial differential equations with variable and singular coefficients are presented. For the two-dimensional plate problem,
Lat. Am. j. solids struct.. Publicado em: 2015-07
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4. Deflection profile analysis of beams on two-parameter elastic subgrade
A procedure involving spectral Galerkin and integral transformation methods has been developed and applied to treat the problem of the dynamic deflections of beam structure resting on bi-parametric elastic subgrade and subjected to travelling loads. The case of the response to moving constant loads of this slender member is first investigated and a closed fo
Lat. Am. j. solids struct.. Publicado em: 2013-03
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5. Dynamic response to moving masses of rectangular plates with general boundary conditions and resting on variable winkler foundation
The dynamic response to moving masses of rectangular plates with general classical boundary conditions and resting on variable Winkler elastic foundation is investigated in this work. The governing fourth order partial differential equation is solved using a technique based on separation of variables, the modified method of Struble and the integral transform
Lat. Am. j. solids struct.. Publicado em: 2013-03
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6. Análise conformacional de alguns aminoácidos e ésteres metílicos de aminoácidos / Conformational analysis of some amino acids and amino acids methyl esters
São reportadas na presente dissertação as análises conformacionais dos aminoácidos da glicina, L-alanina, sarcosina e N,N-dimetilglicina e dos ésteres metílicos da L-valina, L-fenilalanina e L-tirosina, utilizando cálculos teóricos e espectroscopias de RMN de H e infravermelho. Todos os cálculos foram executados em nível B3LYP/aug-cc-pVDZ e compar
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/07/2011
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7. Interações entre glicina e elétrons de baixa energia: formação de íons metaestáveis e afinidade eletrônica / Interactions between glycine and low energy electrons: formation of metastable ions and electron affinity
In this work we have performed calculations of elastic differential and integral cross-sections for electron-glycine scattering , and performed calculations of electron affinities of gly-(H2O)n clusters. The scattering calculations were done using the Schwinger multichanel method with pseudopotentials (SMCPP) in the static-exchange (SE) and in the static-exc
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/12/2010
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8. Flexural motions under accelerating loads of structurally prestressed beams with general boundary conditions
The transverse vibration of a prismatic Rayleigh beam resting on elastic foundation and continuously acted upon by concentrated masses moving with arbitrarily prescribed velocity is studied. A procedure involving generalized finite integral transform, the use of the expression of the Dirac delta function in series form, a modification of the Struble's asympt
Latin American Journal of Solids and Structures. Publicado em: 2010-09
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9. Applications of the Schwinger multichannel method to electron and positron scattering by molecules / Aplicaçôes do metodo multicanal de Schwinger ao espalhamento de eletrons e positrons por moleculas
O Método Multicanal de Schwinger (SMC) foi utilizado para estudar o espalhamento de elétrons e pósitrons de baixa energia por moléculas de pirrol (C4H4NH) e propanol (C3H7OH), para o primeiro caso, e acetileno (C2H2) e monóxido de carbono (CO), para o último caso. Seções de choque elásticas integrais e diferenciais foram calculadas para todos os sis
Publicado em: 2010
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10. O ecocardiograma como preditor de variáveis hemodinâmicas nas cardiopatias congênitas com hipertensão pulmonar e nos candidatos a transplante cardíaco / Echocardiographyc estimates of hemodynamic parameters in pulmonary hypertension associated with congenital cardiac shunts or cardiomyopathy
Pulmonary hypertension is defined as a mean pulmonary arterial pressure of >25 mmHg registered at rest, during cardiac catheterization. A number of conditions have been demonstrated to cause pulmonary hypertension, including congenital (septal defects) and acquired heart diseases, chronic lung disease, connective-tissue disease, thromboembolic disorders, sch
Publicado em: 2009
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11. Espectroscopia por ressonância magnética de prótons em epilepsia mioclônica juvenil sugere o comprometimento de uma rede neuronal específica
OBJECTIVES: The neuroanatomical basis and the neurochemical abnormalities that underlay juvenile myoclonic epilepsy (JME) are not fully defined. While the thalamus plays a central role in synchronization of widespread regions of the cerebral cortex during a seizure, emerging evidence suggests that all cortical neurons may not be homogeneously involved. The p
Journal of Epilepsy and Clinical Neurophysiology. Publicado em: 2008-09
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12. Medida da secção de choque térmica e da integral de ressonância da reação 41K(n,)42K / Thermal cross-section and resonance integral of the 41K(n,g)42K(n,g)43K reaction measurement
Pellets of potassium nitrate were irradiated in the IPEN/CNEN-SP (Instituto de Pesquisas Energeticas e Nucleares, Comissao de Energia Nuclear, Sao Paulo, SP) IEAR1m reactor core operating at 2 MW power in order to determine the 41K(n,g)42K reaction thermal cross-section and resonance integral. The neutron flux was monitored by Au-Al alloy foils, and the West
Publicado em: 2008