The Role of the Central Monoamine System and the Cholinoceptive Pontine Area on the Oscillation of ICP “Pressure Waves”

1986 ◽  
pp. 151-155 ◽  
Author(s):  
M. Maeda ◽  
K. Takahashi ◽  
M. Miyazaki ◽  
S. Ishii
Keyword(s):  
Pressure Waves ◽  
Central Monoamine

Landslide Stability: Role of Rainfall-Induced, Laterally Propagating, Pore-Pressure Waves

2011 ◽  
Vol 17 (4) ◽  
pp. 315-335 ◽  
Author(s):  
G. R. PRIEST ◽  
W. H. SCHULZ ◽  
W. L. ELLIS ◽  
J. A. ALLAN ◽  
A. R. NIEM ◽  
...  
Keyword(s):  
Pore Pressure ◽  
Pressure Waves ◽  
Landslide Stability

scholarly journals Role of pressure waves in the heating of the end-gas in HCCI engine with activation by pulsed corona discharge

2021 ◽  
Vol 2100 (1) ◽  
pp. 012016
Author(s):  
A S Dobrovolskaya ◽  
E A Filimonova ◽  
V A Bityurin ◽  
A N Bocharov
Keyword(s):  
Wave Propagation ◽  
Corona Discharge ◽  
Combustion Wave ◽  
Chemical Reactions ◽  
Pressure Waves ◽  
Hcci Engine ◽  
Combustion Wave Propagation ◽  
Pulsed Corona ◽  
Numerical Research

Abstract In this paper we present numerical research of pressure waves influence on the end-gas in HCCI engine with discharge activation. It is shown that there is certain promotion of exothermic chemical reactions by pressure waves. That leads to the slight heating of the end-gas, but mainly the end-gas is heated due to the compression in the process of combustion wave propagation.

Formation of cavities and microjets in liquids and their role in initiation and growth of explosion

1967 ◽  
Vol 298 (1452) ◽  
pp. 38-50 ◽  
Keyword(s):  
High Speed ◽  
Solid Surfaces ◽  
Pressure Waves ◽  
Liquid Explosive ◽  
Rarefaction Waves ◽  
Burning Zone ◽  
Rapid Transition ◽  
High Pressure Zone ◽  
The Impact

The role of discontinuities, such as bubbles of gas and cavities, in the initiation and growth of explosion in liquids has been studied experimentally by means of high speed framing photography. It is shown that micro Munroe jets can be formed at the surface of a gas bubble which has been trapped in the liquid explosive between two impacting surfaces and is being rapidly compressed. As the compression continues these jets are projected at high speed into the gas. Similar jets can be produced between two drops of explosive which are coalescing during impact. These jets may facilitate the initiation of burning both by increasing the impact velocity of the liquid and by dispersing the liquid within a pocket of compressed and heated gas. The reaction grows first as an accelerating burning. The pressure developed in this burning zone has, in the early stages, the effect of closing up and removing any cavities which may exist in the explosive directly ahead of the flame front, so that the reaction advances into a homogeneous zone of liquid that is free from discontinuities. It is not until the comparatively slow burning breaks through the homogeneous high pressure zone, and reaches a zone of liquid containing numerous cavities and bubbles, that the burning is able to transform quickly into a much faster and more violent explosion. The discontinuities are then able to sustain the rapid propagation of explosion. This region of discontinuities can be created in initially homogeneous liquids enclosed between solid surfaces by pressure waves which travel through the confining solids and ahead of the subsonic burning. If these pressure waves increase the distance between the confining surfaces substantially or are converted into rarefaction waves by reflexion, they can produce regions of tension in the unreacted liquid and disrupt it well ahead of the reaction zone. The bubbles of gas or cavities that are formed in this way by the precursor waves create an environment which is conducive to the rapid transition from burning to explosion.

scholarly journals About Possible Role of Negative Pressure Waves in Geophysical Processes

2014 ◽  
Vol 6 (5) ◽  
Author(s):  
Fuad H. Veliev ◽  
Ibrahim S. Guliyev
Keyword(s):  
Negative Pressure ◽  
Pressure Waves ◽  
Geophysical Processes

Temporal and spatial variations in precipitation on Aldabra

1979 ◽  
Vol 286 (1011) ◽  
pp. 25-33 ◽  
Keyword(s):  
Atmospheric Pressure ◽  
Trade Wind ◽  
Research Station ◽  
Pressure Waves ◽  
Relative Temperature ◽  
Hourly Rainfall ◽  
Dry Seasons ◽  
Temporal And Spatial ◽  
Wet And Dry Seasons

Analysis of hourly rainfall data from Aldabra has indicated that the atoll influences its own weather as recorded at the Research Station on Ile Picard. The strength of this local influence varies with the season and may be related to the relative temperature difference between lagoon surface water and the atmosphere above it. The direction and strength of the prevailing wind may also be of some importance. The role of the semi-diurnal atmospheric pressure waves is not clearly evident at all times but is most prominent during the early hours of both wet and dry seasons. Its effect may also be present in the slight increase in rain frequency during the late afternoon of the trade wind seasons. The trans-atoll variations in rainfall amounts confirm the earlier reports of non-synchronous rainfalls. There is some indication of seasonal variation of rainfall at different points around the atoll relative to that received at the Research Station. The northwest and southwest parts of the atoll may receive more rain than the northeast or west central parts.

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