Results 211 to 220 of about 245,653 (257)
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Pressure oscillations in bubble columns
The Chemical Engineering Journal, 1983Abstract Spontaneous pressure oscillations have been studied theoretically and experimentally. The authors have formulated a hypothesis concerning the oscillation mechanism and worked out a mathematical model that enables calculation of oscillation frequency for a system comprised of a bubble column, sieve plate and gas chamber representing the ...
J. Guszek, R. Marcinkowski
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Segmented SRM Pressure Oscillation Demonstrator
47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2011Large rocket motors, especially those with segmented grains, often exhibit pressure and thrust oscillations caused by coupling between large scale vortices (vortex shedding) and the acoustic modes of the chamber. The pressure oscillation of most concern in large motors is the longitudinal modes roughly corresponding to the first acoustic modes of the ...
Giorgio Mastrangelo +12 more
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P80 SRM Pressure Oscillations Reconstruction
2018 Joint Propulsion Conference, 2018Large solid rocket motors (SRMs) may exhibit pressure oscillations (PO) during their quasi-steady-state due to the coupling between chamber acoustic, usually the longitudinal modes, and other typical physical phenomena related to the combustion products flow, leading to a resonant condition.
Laureti Mariasole +3 more
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Social stress induced pressure breathing and consequent blood pressure oscillation
Life Sciences, 1986A large amplitude blood pressure oscillation occurs during social defeat in a territorial fight between male rats, and during the application of a psychosocial stimulus associated with this defeat. Synchronous recording of blood pressure, intrathoracic pressure and diaphragm activity shows that the blood pressure oscillation coincides with a typical ...
Fokkema, Dirk S. +3 more
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Cuff Pressure Oscillations in the Measurement of Relative Blood Pressure
Psychophysiology, 1977ABSTRACTThe continuous relative blood pressure measure obtained with a partially‐inflated arm blood‐pressure cuff operates under the same principle as the oscillometric method of blood pressure determination. In psychophysiological studies the rise in blood pressure seen, for example, in response to an emotion‐evoking question, produces a rise in cuff ...
L A, Geddes, D C, Newberg
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Spontaneous blood pressure oscillations and cerebral autoregulation
Clinical Autonomic Research, 1998The relationship between spontaneous oscillations in cerebral blood flow velocity (CBFV) and arterial blood pressure (ABP) was analysed in normal subjects in order to evaluate whether these relationships provide information about cerebral autoregulation.
R R, Diehl +3 more
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Pressure Oscillations in P230 SRM: Numerical Simulation
42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2006[Abstract] In the present work a numerical study of pressure oscillation frequencies and amplitudes in Ariane 5 MPS P230 boosters will be presented. The study has been conducted by means a commercial CFD package. Validation of the adopted approach has been made on the basis of a cold flow test case.
M. TELARA +3 more
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Beat‐to‐beat oscillations in pulse pressure
Clinical Physiology and Functional Imaging, 2004SummaryWe compared 5‐min standard deviations (SD) and frequency domain measures of beat‐to‐beat pulse pressure (PP) variability with those of RR‐interval, systolic (SBP) and diastolic (DBP) blood pressure variabilities, and with cross‐spectral baroreflex sensitivity (BRS) in a population‐based sample of 150 healthy individuals, aged 35–64 years.
Raine, Virtanen +3 more
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Intracranial pressure oscillations (B-waves) caused by oscillations in cerebrovascular volume
Acta Neurochirurgica, 1983In experiments during stepwise increases in intracranial pressure, B-waves could be provoked synchronously with pial vascular diameter oscillations. The vascular oscillations are known to be a sign of myogenic cerebrovascular regulation. An increase in their amplitude indicates vessel wall relaxation and impending failure of myogenic autoregulation ...
L M, Auer, I, Sayama
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Pressure oscillations and fallout downdraughts
Quarterly Journal of the Royal Meteorological Society, 1962AbstractThe generation of widespread pressure oscillations in southern Australia on 26–27 January 1960 is examined in some detail, by means of available barograms, and spectral analysis of a Melbourne Dines microbarogram. Photographs of mamma cloud taken at Adelaide give some insight into the processes at work producing both cloud form and oscillations.
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