Results 251 to 260 of about 54,048 (301)

Pressure pulsations enhance penetration index in COPD

Drug Delivery and Translational Research, 2021
This study was done in order to evaluate the effect of a novel pressure pulsation device (Pulsehaler™, Respinova Ltd., Israel) on the deposition pattern of inhaled aerosol in the lungs of COPD patients. Fifteen COPD patients were recruited to undergo spirometry and SPECT-CT lung scan following nebulization of radioactively labeled albuterol in saline ...
Noam, Gavriely, Olga, Volkov, Gershon, Fink, Isaac, Shpirer, Haim, Golan   +4 more
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Rheodynamic model of cardiac pressure pulsations

Mathematical Biosciences, 1999
To analyse parametrically (in terms of the qualitative theory of dynamical systems) the mechanical influence of inertia, resistance (positive and negative), elasticity and other global properties of the heart-muscle on the left ventricular pressure, an active rheodynamic model based on the Newtons's principles is proposed. The equation of motion of the
V G, Petrov, S G, Nikolov
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Pressure Pulsation in Solid-Phase Fermentation

Applied Biochemistry and Biotechnology, 2002
Inadequate dissipation of heat generated by biologic activities has prevented the use of solid-phase fermentation in large-scale applications. This study deals with the cooling effects of pressure pulsation on solid, porous beds. Pressure pulsation also enhances evaporation of medium moisture, which is also described.
Xiaomin, Yang, Tom, Huang, George T, Tsao   +2 more
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Arterial Pressure Pulsation During Nonpulsatile Biventricular Bypass Experiments: Possible Idioperipheral Pulsation

Artificial Organs, 1986
Abstract: During nonpulsatile biventricular bypass (NPBVB) experiments, regular fluctuations of arterial pressure were observed in all five long‐term animals whose ventricles were fibrillated. Analysis of the characteristics of this fluctuation was performed retrospectively.
T, Tsutsui, Y, Nosé
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Pressure pulsations above turbomolecular pumps

Journal of Vacuum Science and Technology, 1982
The effect of increasing the temperature of the cooling water for a Leybold Turbovac 350 is studied. (AIP)
S. Danziger, B. R. F. Kendall, J. Dormer
openaire   +1 more source

Pressure Pulsations in Centrifugal Pumps

Journal of Vibration and Acoustics, 1992
Pressure pulsations in centrifugal pumps are created by the wake flow from the impeller blade trailing edge and by large-scale turbulence and vortices generated by flow separation and flow recirculation at part load. The physical mechanisms causing pressure pulsations and the design parameters having an influence on the level of the pressure pulsations
J. F. Guelich, U. Bolleter
openaire   +1 more source

Pressure Pulsation of Scroll Compressor

Advanced Energy Systems, 1997
Abstract Pressure pulsation in the scroll compressor was analyzed with three dimensional FLIC (flow in cell) method which was a kind of finite volume method. In advance of analyses, the grid generation method for numerical analysis was established in the scroll compression chamber.
Takahide Itoh, Makoto Fujitani
openaire   +1 more source

Relationship between arterial pulsations and intraocular pressure

Experimental Eye Research, 1983
A model of the eye is proposed in order to find a relationship between small changes in volume and the intraocular pressure in terms of the physical parameters of the globe. The results show that pulsations in pressure due to small variations in volume are directly proportional to the average intraocular pressure and inversely proportional to the ...
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Transducers for measuring strong pressure pulsations

Measurement Techniques, 1997
Results are presented from an experimental study of pressure pulsations inside the precumbustion chamber of a model of a combustion engine. The pulsations are studied with the use of thin-film capacitive transducers.
A. A. Kazaryan, P. V. Miodushevskii, A. S. Mirskov   +2 more
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Attenuation of low frequency pressure pulsations

2022
In this thesis, the concept of hydraulic pulsating filter is explored and developed. The filter or resonator is designed to attenuate the pulsation that occurs when the hydraulic pump is discharged. Pumps pulsate over a range of frequencies, depending on pump design, speed, displacement, and other factors.
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