Vibrational Excitation
Mostrando 1-12 de 32 artigos, teses e dissertações.
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1. Modal Parameter Extraction of a Huge Four Stage Centrifugal Compressor Using Operational Modal Analysis Method
Abstract In recent years, modal analysis has become one of the essential methods for modification and optimization of dynamic characteristics of engineering structures. This is the first published study to identify modal parameters of a complex four-stage centrifugal compressor using Operational Modal Analysis (OMA). Vibrational response was measured contin
Lat. Am. j. solids struct.. Publicado em: 03/05/2018
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2. Pattern Identification on the Nonlinear Radial Motion of an Oscillating Spherical Bubble Using Neural Networks
Abstract The main goal of this article is to study the oscillatory motion of a spherical gas bubble immersed in a Newtonian liquid subjected to a harmonic pressure excitation. We use the classical Rayleigh-Plesset equation to study the radial motion of the bubble undergoing a forcing acoustic pressure field. The second order nonlinear ordinary differential e
Lat. Am. j. solids struct.. Publicado em: 2016-12
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3. Estudo teórico da estrutura eletrônica e da dinâmica induzida por lasers da molécula de HCl
Potential energy and dipole moment curves for the HCl molecule were computed. Calculations were performed at different levels of theory (DFT, MRCI). Spectroscopic properties are reported and compared with experimental data, for validating the theoretical approaches. Interaction of infrared radiation with HCl is simulated using the wave packet formalism. The
Quím. Nova. Publicado em: 2013
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4. 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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5. Experimental study of low-pressure nitrogen dielectric barrier discharge
The electrical and spectral characteristics of a dielectric barrier discharge (DBD) are experimentally investigated in a sealed off coaxial cylinder filled with nitrogen at a pressure of 10 mbar. The discharge is a transient diffused glow at low frequency alternating voltage (60 Hz) and changes to a filamentary mode at high frequency alternating voltage (35
Brazilian Journal of Physics. Publicado em: 2010-12
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6. Ordem-desordem: uma avaliação estrutural do Ba(ZrxTi1-x)O3 / Order-disorder: an evaluation structural of Ba(ZrxTi1x)O3
This work have as aim, the synthesis of ceramic powders of Ba(ZrxTi1x)O3 (x = 0, 0.25, 0.50, 0.75 and 1) by the polymeric precursor method and investigate the degree of structural order-disorder of these systems by different characterization techniques, such as: thermogravimetric analysis (TA), differential thermal analysis (DTA), X-ray diffraction (XRD), Ra
Publicado em: 2009
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7. SÃntese e caracterizaÃÃo de complexos bipiridÃnicos de rutÃnio com ligantes polinitrilados / Synthesis and characterization of complexes bipiridÃnicos of ruthenium with metalto-ligand
In this work, the [Ru(bpy)(dcbpy)(TCNQ)Cl] and [Ru(bpy)(dcbpy)(TCNE)Cl] complexes, called Ru-TCNQ and Ru-TCNE, respectively, where bpy = 2,2â- bipyridine and dcbpy = 4,4â-dicarboxy-2,2â-bipyridine, were synthesized and characterized by spectroscopy and electrochemical techniques. The absorption spectra of the Ru-TCNQ and Ru-TCNE complexes showed bands ass
Publicado em: 2007
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8. Reaction Mechanisms on the 16,18O + 63,65Cu Systems / Mecanismos de Reação nos Sistemas 16,18O + 63,65Cu
The quasi-elastic excitation functions for the systems 16,18O + 63,65Cu have been measured, at the angle 161º and at energies between 30 and 48MeV, in the laboratory reference system. The quasi-elastic term refers to the sum of the elastic scattering, the inelastic scattering and the transfer reactions. Care has been taken in order to obtain high precision
Publicado em: 2007
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9. "Síntese e Estudos Espectroscópicos dos Compostos Envolvendo Metais Divalentes (Mn, Co, Ni, Cu, Zn) Contendo o Ligante Nitrogenado 1,3-bis (4-piridil) propano e o Íon Esquarato"
This work deals with the synthesis, specteroscopic characterization and crystal structure determination of coordination polymers formed by the interaction between squarate ion, 1,3-bis(4-pyridil)propane (BPP) and several transition metal ions (Mn2+, Co2+, Ni2+, Cu2+ e Zn2+). Eleven compounds have been obtained, and ten are new ones; from these new compounds,
Publicado em: 2007
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10. Comparative study of vibracional excitation of hydrogen molecules by electron and positron impact / Estudo comparativo das seções de choque de excitações vibracionais de moleculas de hidrogenio por impacto de positrons e eletrons
Here we report a comparative calculation of both integral and differential vibrational excitation cross sections of low energy positron and electron scattering against Hydrogen molecules (H2). For these calculations we have used the Schwinger Multichannel (SMC) Method [1] for positron collision [2] and electron collision [3]. Using a set of SMC scattering am
Publicado em: 2006
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11. Vibrational excitations mediated by a electronic Feshbach resonance 2Eg+ in electron scattering by hydrogen molecules / Excitações vibracionais medidas pela ressonancia de Feshbach eletronica 2Eg+ no espalhamento de eletrons por moleculas de hidrogenio
The relationship between Feshbach resonances and electronic excitation is well known in electron scattering by Hydrogen molecules, but still little exploited in the positron scattering case, making interesting, a comparative study. However, before thinking about comparisons, we have to address the question if, in fact, a Feshbach resonance manifests itself i
Publicado em: 2006
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12. Numerical prediction of nonequilibrium hypersonic flow around Brazilian satellite SARA
Hypersonic flows past Brazilian satellite SARA at zero angle of attack in chemical and thermal nonequilibrium are investigated using an axisymmetric Navier-Stokes solver. The numerical solutions were carried out for freestream conditions equivalent to a typically re-entry trajectory with a range of Mach numbers from 10 to 25. The gas was chemically composed
Brazilian Journal of Physics. Publicado em: 2005-03