Fluctuation Of Pressure
Mostrando 13-24 de 35 artigos, teses e dissertações.
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13. Teoria entrópica da nucleação e função entropia aplicadas à condensação do vapor dágua / Entropic nucleation theory and entropy function applied to water vapor condensation
The phenomenon of nucleation is an intrinsically irreversible process. The nucleation is explored by the Entropic Nucleation Theory (ENT), in which, the irreversible process is replaced by an equivalent one, although now, the process is reversible in which there is a change in the enthalpy, and also an structural rearrangement coded in the change of de entro
Publicado em: 2007
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14. Identificação e monitoramento do regime fluidodinamico do leito de jorro no recobrimento de particulas / Identify and monitoring of flow regimes spouted bed coating of particles
The coating of particles in spouted has shown sufficiently promising, in view of its potential of applications in several products such as tablets, cosmetics, seeds, fertilizers. However, the works reported in literature had been predominantly based on visual observations, through columns constructed with transparent material, operated the pressure and ambie
Publicado em: 2007
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15. Identificação e monitoramento de regimes de escoamento em leito de jorro
Spouted bed has been studied intensively because of its potential of application in several processes. Identification and characterization of flow regimes in spouted bed based on visual observation have been reported in literature. However, the characterization of flow regimes based on visual observation is not either usual or possible in industrial equipmen
Publicado em: 2006
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16. Time series analysis of pressure fluctuation in gas-solid fluidized beds
The purpose of the present work was to study the differentiation of states of typical fluidization (single bubble, multiple bubble and slugging) in a gas-solid fluidized bed, using spectral analysis of pressure fluctuation time series. The effects of the method of measuring (differential and absolute) pressure fluctuations and the axial position of the probe
Brazilian Journal of Chemical Engineering. Publicado em: 2004-09
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17. Identificação e monitoramento de regime fluidodinamico em leitos fluidizados gas-solido
Power spectra obtained through Fast Fourier Transform (FTT) from time series of pressure fluctuation, showed to be an effective technique for on line monitoring of typical fluidization regimes of gas-solid bubbling columns. It was experimentally verified that the methodology permitted the identification and distinction of different contact regimes. This meth
Publicado em: 2004
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18. Critical Analyse of Dynamical of Quantum Pendular Cavity / Análise Crítica da Dinâmica de uma Cavidade Pendular Quântica
We perform a quantum mechanical analysis of a pendular cavity, using the positive-P representation, showing that the quantum state of the moving mirror, a microscopic object, has noticeable eects on the dynamics. This system was previously been proposed as a candidate for the quantum-limited measurement of small displacements os the mirror due to radiation p
Publicado em: 2004
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19. Serial blood pressure measurements
The objective of the present investigation was to study the effects of a 60-s interval of venous congestion between two noninvasive measurements of arterial blood pressure (ABP) on the fluctuation of ABP, assessed by the standard deviation of the differences between two readings. ABP was measured in 345 successive patients, at rest, four times each. For 269
Brazilian Journal of Medical and Biological Research. Publicado em: 2002-05
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20. Fast neutral lithium beam for density and its fluctuation measurements at the boundary regions of ETE tokamak
A Fast Neutral Lithium Beam Probe (FNLBP) is being developed, in order, to perform measurement of the boundary plasma density in discharges of the Spherical Tokamak ETE, recently built at LAP/INPE. This plasma diagnostic method is adequate for use in fusion devices because it does not perturb the plasma and it provides data with high space and time resolutio
Brazilian Journal of Physics. Publicado em: 2002-03
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21. Onset of Nucleate Boiling and Onset of Fully Developed Subcooled Boiling Using Pressure Transducers Signals Spectral Analysis
The experimental technique used for detection of subcooled boiling through analysis of the fluctuation contained in pressure transducer signals is presented. This work was partly conducted at the Institut für Kerntechnik und zertörungsfreie Prüfverfahren von Hannover (IKPH, Germany) in a thermal-hydraulic circuit with one electrically heated rod with annu
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2001
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22. AXIAL AND BENDING LOADING OF STRUCTURES CAUSED BY THERMAL DIFFERENCES / SOLICITAÇÃO DE HASTES A FLEXÃO E ESFORÇO AXIAL PROVOCADOS POR DIFERENÇAS TÉRMICAS
Different types of structures submitted to thermal loadings under different conditions of support are studied in this work, with the purpose of analysing the thermal Ratchet Mechanism. This phenomena is na important criteria of safety of nuclear power systems. A first model was used to simulate the bahavior of a structure free of bending, submitted to temper
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/04/1981
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23. Pressure-Dependent Structure Changes in Barnase on Ligand Binding Reveal Intermediate Rate Fluctuations
In this work we measured 1H NMR chemical shifts for the ribonuclease barnase at pressures from 3 MPa to 200 MPa, both free and bound to d(CGAC). Shift changes with pressure were used as restraints to determine the change in structure with pressure. Free barnase is compressed by ∼0.7%. The largest changes are on the ligand-binding face close to Lys-27, whi
The Biophysical Society.
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24. Genetic variability maintained in a finite population under mutation and autocorrelated random fluctuation of selection intensity
By using the diffusion equation method, the level of genetic variability maintained under mutation pressure in a finite population is investigated, assuming autocorrelated random fluctuation of selection intensity. An appropriate mathematical model was formulated to treat the change of gene frequencies, incorporating mutation pressure and fluctuating selecti