On the Tilts Caused by Equilibrium Fluctuations of Atmospheric Pressure: Effect of Topography

2019 ◽  
Vol 55 (6) ◽  
pp. 936-944
Author(s):  
I. Ya. Tsurkis
Keyword(s):  
Atmospheric Pressure ◽  
Pressure Effect ◽  
Equilibrium Fluctuations

scholarly journals DC Electrical Ageing of XLPE under Hydrostatic Pressure

2017 ◽  
Vol 2017 ◽  
pp. 1-5 ◽  
Author(s):  
Fadila Benlizidia Lalam ◽  
Faouzi Djemmal
Keyword(s):  
Hydrostatic Pressure ◽  
Direct Current ◽  
Atmospheric Pressure ◽  
Pressure Effect ◽  
Power Model ◽  
Lifetime Data ◽  
Confidence Bounds ◽  
Polyethylene Films ◽  
Thermally Activated ◽  
Thermally Activated Process

The experimental electrical ageing, of cross-linked polyethylene films 100 μm thick, was investigated under high hydrostatic pressure of 300 bar and at atmospheric pressure. The tests are conducted on direct current (dc) for up to 1000 h ageing and at temperature of 70°C. The use of the Weibull statistic, with the estimation of confidence bounds at 90%, has shown that the hydrostatic pressure has a real effect on the lifetime. These lifetime data are qualitatively analyzed with the inverse power model. It was found that thermally activated process is able to describe the pressure effect on the electrical ageing of XLPE.

Decomposition of methyl orange using pulsed discharge plasma at atmospheric pressure: Effect of different electrodes

2013 ◽  
Vol 53 (1) ◽  
pp. 010212 ◽  
Author(s):  
Yui Hayashi ◽  
Wahyudiono ◽  
Siti Machmudah ◽  
Noriharu Takada ◽  
Hideki Kanda ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Atmospheric Pressure ◽  
Discharge Plasma ◽  
Pressure Effect ◽  
Pulsed Discharge ◽  
Pulsed Discharge Plasma

A model to simulate leakage through joints in water distribution systems

2015 ◽  
Vol 15 (4) ◽  
pp. 852-863 ◽  
Author(s):  
Carmine Covelli ◽  
Luca Cozzolino ◽  
Luigi Cimorelli ◽  
Renata Della Morte ◽  
Domenico Pianese
Keyword(s):  
Atmospheric Pressure ◽  
Distribution Systems ◽  
Water Distribution ◽  
Pressure Effect ◽  
Water Distribution Systems ◽  
Outer Side ◽  
Preliminary Evaluation ◽  
Considerable Part ◽  
Water Losses ◽  
Background Leakage

The water loss is a phenomenon frequently observed within water distribution systems. A considerable part of water losses occurs either because of the incorrect assembly of joints or because of the fatigue and ageing of the material used to ensure a watertight seal. Moreover, such a leakage is very difficult to detect and to assess. In this work, we present a novel formulation for modelling the pressure effect on the background leakage through the joints. The proposed approach is based on the preliminary evaluation of the enlargement Δω, due to pressure, of the existing space between the outer side of the spigot end of a pipe and the inner wall of the hub end of the adjacent pipe (which is characterised by the area ωatm at atmospheric pressure). Furthermore, the whole procedure is based on the evaluation, by field data or calibration, of a parameter ξ representing the rate of enlarged area ω that, for several reasons, may be not covered by the gasket, ω being the value, at pressure p, of the area above defined.

scholarly journals The effect of pressure on reactions in solution I—Sodium ethoxide and ethyl iodide to 3000 kg/cm 2 II—Pyridine and ethyl iodide to 8500 kg/cm 2

1935 ◽  
Vol 150 (869) ◽  
pp. 223-240 ◽  
Keyword(s):  
Atmospheric Pressure ◽  
Pressure Effect ◽  
Sodium Ethoxide ◽  
Ethyl Iodide ◽  
Effect Of Temperature ◽  
Reaction Velocity ◽  
Velocity Constant ◽  
Effect Of Pressure ◽  
Different Temperatures ◽  
Arrhenius Expression

Previous work has shown that pressure has an accelerating effect on a large number of chemical reactions in the liquid phase. The rates of the reaction between pyridine and cetyl halides have been studied at different temperatures and pressures, but it was not found possible to interpret the results by means of the ordinary reaction velocity equations, and no conclusions could be drawn as to the mechanism of the pressure effect. In making a further attempt to determine this mechanism, it seemed desirable to take reactions which have already been studied at atmospheric pressure and are known to follow the simple velocity equations, and to investigate the effect of pressure on the velocity con­stants. The effect of temperature on the velocity constant of a reaction k , can be expressed by the Arrhenius expression k = A e -E/RT . A knowledge of the variation of the velocity constant with pressure at different temperatures would show whether this change is due to a change in the value of the constants A or E, or of both.

Effect of the Amount of Channel Black on Underwater Property of PU Material

2011 ◽  
Vol 403-408 ◽  
pp. 93-96
Author(s):  
Xu Wen Wang ◽  
Yong Bing Zhang ◽  
Xin Zhi Lin ◽  
Ying Fu Sun
Keyword(s):  
Atmospheric Pressure ◽  
Pressure Effect

Effect of the amount of Channel Black on underwater property of PU material is researched by adding Channel Black into PU material. The results show that the amount of Channel Black has most effect on underwater property of PU material. In one atmospheric pressure, the underwater property of PU material is worst when the amount of Channel Black is 60, while the underwater properties are not evident when the amount of channel is 30 and 45. In lower underwater pressure, effect of the amount of Channel Black on underwater property of PU material is almost difference. In higher underwater pressure, the underwater property of PU material is best when the amount of Channel Black is 45, while 30 is second, and 60 is lowest.

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