Results 251 to 260 of about 54,486 (301)
Some of the next articles are maybe not open access.
Pressure pulsations enhance penetration index in COPD
Drug Delivery and Translational Research, 2021This 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 +4 more
openaire +2 more sources
Pressure Pulsation in Solid-Phase Fermentation
Applied Biochemistry and Biotechnology, 2002Inadequate 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 +2 more
openaire +2 more sources
Rheodynamic model of cardiac pressure pulsations
Mathematical Biosciences, 1999To 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
openaire +2 more sources
Pressure Pulsations in Centrifugal Pumps
Journal of Vibration and Acoustics, 1992Pressure 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, 1997Abstract 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
Pressure pulsations on an obstacle in a jet
Fluid Dynamics, 1980At the present time, much attention is devoted to auto-oscillations that arise from the interaction between a supersonic underexpanded jet and an obstacle that it encounters at right angles [1, 2]. There are far fewer data on the pressure pulsations on an obstacle in the absence of auto-oscillations [3–6].
V. M. Kuptsov +3 more
openaire +1 more source
The effect of pressure pulsations on the Fahraeus-Lindqvist effect
Microvascular Research, 1978Abstract The effect of superposition of pressure pulses on the steady flow of blood through narrow tubes with diameters in the Fahraeus-Lindqvist range was studied experimentally to determine whether pulsations modify the diameter-dependent viscosity reduction of blood in these rigid tubes.
C K, Krishnakumar, A A, Rovick, Z, Lavan
openaire +2 more sources
Microcirculatory response to periodic pulsations in capillary pressure
Microvascular Research, 1982Abstract A mathematical analysis of time-dependent convection and diffusion in the microcirculation is presented in order to ascertain the effect on capillary-tissue fluid exchange of cardiac pulsatility and the rhythmic contractions of arterioles and precapillary sphincters.
E P, Salathé +2 more
openaire +2 more sources
The effect of pressure pulsation on diffusion combustion
27th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics, 2021The paper presents the results of a study of diffusion combustion of gasoline in the presence of external pressure pulsations with small amplitude. It is found that external pressure pulsations lead to characteristic changes in the temperature field, which are expressed by an increase in the amplitude of the temperature pulsation for certain modes of ...
Agafontsev, Mikhail V. +3 more
openaire +2 more sources
Pressure pulsations in the piping of reciprocating pumps
Chemical Engineering & Technology, 1987AbstractPressure pulsations in hydraulic systems, generated by reciprocating pumps, can cause serious problems with regard to plant safety and reliability. In particular, fatigue problems arise in high‐pressure piping systems. The available knowledge is not sufficient for an accurate computation of pressure peaks in the piping of reciprocating pumps. A
Gerhard Vetter, Friedrich Schweinfurther
openaire +1 more source