Results 221 to 230 of about 47,415 (268)
Some of the next articles are maybe not open access.
Oscillating balloon angioplasty: Does pressure oscillation reach the balloon?
Catheterization and Cardiovascular Diagnosis, 1996Oscillating pressure inflations may minimize trauma to the coronary artery during coronary angioplasty. We measured in vitro diameters of polyolepin copolymer compliant angioplasty balloons (as a surrogate for pressure) during pressure oscillation at the inflator to determine if pressure oscillations at the inflator were conducted to the balloon ...
J C, Blankenship +2 more
openaire +2 more sources
Base Pressure of Oscillating Circular Cylinders
Journal of the Engineering Mechanics Division, 1976Experiments have been made to investigate the base pressure coefficients of circular cylinders oscillating transversely in a stream for a wide range of cylinder amplitudes and frequencies. This is thought to give a good indication of the variation in drag coefficient.
openaire +2 more sources
Nonlinear Pressure Oscillations in a Combustion Field
ARS Journal, 1960M practical importance has been attached to the problem of high frequency combustion instability, in particular, the unstable pressure oscillations which may affect the performance of a rocket motor. A thorough mathematical treatment of the linearized aspects of this problem has been given by Crocco and Cheng (1-3). Basing their theory on the sensitive
openaire +2 more sources
Pressure Oscillations in Asthma Treatment
2022For more than 15 decades, airway smooth muscles (ASMs) contraction has been recognized as the primary driving mechanism for asthma attacks. Breathing has a strong relaxing and protection effect on ASM by inhibiting airway constriction. It is crucial to understand the behavior of ASM, which helps to understand the reversible airway obstruction ...
Ahmed Al-Jumaily, Lulu Wang
openaire +1 more source
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
openaire +1 more source
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
openaire +2 more sources
Modeling and Simulation of Pressure Oscillations in a Gas Pressure Regulator
Fluid Power Systems and Technology, 2000Abstract Pressure stability on gas networks is a major concern for designers and operators of Gaz de France transmission and distribution networks. Pressure level is controlled by pressure regulators. To improve the process control and optimise the design of pressure regulating stations (PRS), experimental and numerical studies have been
Bruno Delenne, Laurent Mode
openaire +1 more source
Pressure sensitive paint for oscillating pressure fields measurements
ICIASF 99. 18th International Congress on Instrumentation in Aerospace Simulation Facilities. Record (Cat. No.99CH37025), 2003The paper describes the main problems encountered during investigations of the oscillating pressure fields by the Fast Binary Pressure Sensitive Paint (FBPSP). This formulation has response time in the millisecond range and provides compensation of the model displacements and excitation light instability.
S.D. Fonov +6 more
openaire +1 more source
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)].
openaire +1 more source
Measurement of CSF dynamics with oscillating pressure infusion
Acta Neurologica Scandinavica, 2012Infusion tests are used to diagnose and select patients with idiopathic normal pressure hydrocephalus (INPH) for shunt surgery. The test characterizes cerebrospinal fluid dynamics and estimates parameters of the cerebrospinal fluid system, the pressure-volume index (PVI) and the outflow conductance (Cout). The Oscillating Pressure Infusion (OPI) method
K, Andersson +5 more
openaire +2 more sources