Results 161 to 170 of about 290,148 (203)
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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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The diurnal surface-pressure oscillation
Archiv für Meteorologie, Geophysik und Bioklimatologie Serie A, 1965A spherical harmonic analysis of the diurnal surface pressure oscillation shows that its main part can be represented by a wave travelling westward with the sun. The amplitude of this wave is about half of that of the semidiurnal oscillation [eq. (7)].
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Pressure Oscillations in Aft-Finocyl SRMs
AIAA Scitech 2019 Forum, 2019The problem of pressure oscillations, occurring during the quasi-steady state of aft-finocyl solid rocket motors, is investigated by using the Q1D model AGAR (Aerodynamically Generated Acoustic Resonance) developed and validated at DIMA - Dept. of Mechanical and Aerospace Engineering of Sapienza, University of Rome.
Laureti, Mariasole, Favini, Bernardo
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