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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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Journal ArticleDOI
TL;DR: In this article, the effects of calcination temperature (1048-1173 K), particle size (0.4-2.0 mm), CO2 concentration (0-80 %), and total pressure ( 0.1-1.5 MPa) on the calcination reaction of two limestones and a dolomite with different porous structures were studied by thermogravimetric analysis.

253 citations

Book
31 Dec 1992
TL;DR: In this article, Molecule-Molecule and Molecule Interactions are discussed in terms of collision processes in gases and interaction of charged particles with the surface of the surface.
Abstract: Contents: Molecule-Molecule and Molecule-Interactions. Collision Processes in Gases. Interaction of Charged Particles with Surfaces. Interaction of Radiation with Surfaces. Mechanical Properties of Materials at Very Low Pressures. General Considerations of Pressure Measurement. Total Pressure Gauges. Partial Pressure Gauges. Processing Techniques for Ultrahigh Vacuum. Pumps for Ultrahigh Vacuum. Examples of Ultrahigh Vacuum Systems.

246 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigate the propagation of low-entropy magnetic flux tubes ("bubbles") in the magnetotail and find that the early evolution, after a sudden reduction of pressure and entropy on a localized flux tube, is governed by re-establishing the balance of the total pressure in the dawn-dusk and north-south directions through compression on a time scale less than about 20s for the typical magnetotails.
Abstract: . Using three-dimensional magnetohydrodynamic simulations, we investigate the propagation of low-entropy magnetic flux tubes ("bubbles") in the magnetotail. Our simulations address fundamental properties of the propagation and dynamics of such flux tubes rather than the actual formation process. We find that the early evolution, after a sudden reduction of pressure and entropy on a localized flux tube, is governed by re-establishing the balance of the total pressure in the dawn-dusk and north-south directions through compression on a time scale less than about 20s for the typical magnetotail. The compression returns the equatorial pressure to its original unperturbed value, due to the fact that the magnetic field contributes only little to the total pressure, while farther away from the equatorial plane the magnetic field compression dominates. As a consequence the pressure is no longer constant along a flux tube. The subsequent evolution is characterized by earthward propagation at speeds of the order of 200-400km/s, depending on the initial amount of depletion and the cross-tail extent of a bubble. Simple acceleration without depletion does not lead to significant earthward propagation. It hence seems that both the entropy reduction and the plasma acceleration play an important role in the generation of fast plasma flows and their propagation into the near tail. Earthward moving bubbles are found to be associated with field-aligned current systems, directed earthward on the dawnward edge and tailward on the duskward edge. This is consistent with current systems attributed to observed bursty bulk flows and their auroral effects. Key words. Magnetospheric physics (magnetospheric configuration and dynamics; magnetotail; plasma sheet)nguage:

246 citations

Journal ArticleDOI
TL;DR: In this article, water repellent films were prepared using tetramethylsilane (TMS) and fluoro-alkyl silane (FAS) by microwave plasma enhanced CVD (PECVD).

240 citations

Journal ArticleDOI
TL;DR: In this paper, the active-to-passive transition in the oxidation of SiC and Si3N4 was determined in a flowing air environment as a function of temperature and total pressure, and the experimentally observed transition temperatures ranged from a low of 1347 C to a high of 1543 C for partial pressures of oxygen of 2.5 and 123.2 Pa, respectively.
Abstract: The active-to-passive transition in the oxidation of SiC and Si3N4 was determined in a flowing air environment as a function of temperature and total pressure. The experimentally observed transition temperatures ranged from a low of 1347 C to a high of 1543 C for partial pressures of oxygen of 2.5 and 123.2 Pa, respectively. The SiC and Si3N4 samples had approximately the same transition point for a given pressure. In general, the higher the flow rate, the higher the transition temperature for a given pressure. The transitions for SiC measured in this study agree with previous data for the transition of SiC measured in pure oxygen at reduced pressures and in oxygen inert gas mixtures.

238 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202316
202225
2021127
2020147
2019153
2018128