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Total pressure
About: Total pressure is a research topic. Over the lifetime, 5199 publications have been published within this topic receiving 66658 citations.
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TL;DR: In this paper, the authors used the focussed beam from a single line [P 2 (5)] of a pulsed HF laser to stimulate the decomposition of formic acid.
27 citations
TL;DR: In this article, experimental data were obtained for diffusion of gases at constant total pressure in bidispersed porous alumina solids and monodispersed polysilicon Vycor, covering a 1300 1 range of pressures which included the Knudsen and most of the transition region.
26 citations
TL;DR: In this paper, the authors measured the pressure distribution around a sphere placed in aligned magnetic and velocity fields and found that an increase in drag is mainly due to a decrease in the pressure on the base of the body.
Abstract: Measurements of the pressure distribution around a sphere placed in aligned magnetic and velocity fields show that an increase in drag is mainly due to a decrease in the pressure on the base of the body. When magnetic forces are large compared to inertia forces, this decrease is due to a loss in total pressure along streamlines just outside the surface boundary layer and an acceleration of the flow to a velocity much larger than the reference velocity. Separation of a viscous boundary layer takes place behind the equator and still, to a large extent, controls the magnitude of the base pressure and the drag experienced by the sphere. A model consistent with these findings is presented.
26 citations
TL;DR: In this paper, the authors deduced a general formula for pressure of degenerate and relativistic electrons,Pe, which is suitable for superhigh magnetic fields, discuss the quantization of Landau levels of electrons, and consider the quantum electrodynam-ic (QED) effects on the equations of states (EOSs) for different matter systems.
Abstract: Based on our previous work, we deduce a general formula for pressure of degenerate and relativistic electrons,Pe, which is suitable for superhigh magnetic fields, discuss the quantization of Landau levels of electrons, and consider the quantum electrodynam-ic(QED) effects on the equations of states (EOSs) for different matter systems. The main conclusions are as follows:Pe is related to the magnetic field B, matter density ?, and electron fraction Ye ; the stronger the magnetic field, the higher the electron pressure becomes; the high electron pressure could be caused by high Fermi energy of electrons in a superhigh magnetic field; compared with a common radio pulsar, a magnetar could be a more compact oblate spheroid-like deformed neutron star due to the anisotropic total pressure; and an increase in the maximum mass of a magnetar is expected because of the positive contribution of the magnetic field energy to the EOS of the star.
26 citations
TL;DR: In this article, a chemical vapor-deposition technique was developed for epitaxial growth of α-Al2O3 single crystals utilizing the reaction:==================¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¿¿¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¿¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯µµ¯µ
Abstract: A chemical vapor-deposition technique was developed for epitaxial growth of α-Al2O3 single crystals utilizing the reaction:
Oriented crystals weighing up to 5 g were grown between 1550° and 1800°C. The growth rate for constant gas compositions and flow rates increased with an increase in temperature. Etch pit studies showed an average dislocation density of 5 × 103 dislocations/cm2. Spectrochemical and neutron activation analyses indicated total impurity levels below 35 ppm. Crystalline perfection and morphology were controlled by substrate temperature, total pressure, and reactant gas partial pressures.
26 citations