Performance Improvement of MICROMEGAS Detector Based on Neon-isobutane and Neon-DME Gaseous Mixtures at Atmospheric Pressure

2021 ◽  
pp. 89-102
Author(s):  
H. Mounir ◽  
S. Bri ◽  
M. Haddad ◽  
M. Mouhib ◽  
A. Amine
Keyword(s):  
Performance Improvement ◽  
Atmospheric Pressure ◽  
Gaseous Mixtures

The prediction of the viscosity of nonpolar binary gaseous mixtures at atmospheric pressure

AIChE Journal ◽  
1964 ◽  
Vol 10 (4) ◽  
pp. 483-486 ◽  
Author(s):  
Mailand R. Strunk ◽  
Wayne G. Custead ◽  
Gerald L. Stevenson
Keyword(s):  
Atmospheric Pressure ◽  
Gaseous Mixtures

scholarly journals On detonation of gaseous mixtures of acetylene and of pentance

1927 ◽  
Vol 114 (767) ◽  
pp. 137-151 ◽  
Keyword(s):  
Detonation Wave ◽  
Atmospheric Pressure ◽  
Gas Mixture ◽  
Gaseous Mixtures ◽  
Uniform Rate ◽  
Combustible Gas ◽  
Combustible Gas Mixture

If a combustible gas at atmospheric pressure is ignited near one end of a tube and the rate of supply of heat by combustion is greater than the loss by radiation and conduction, the progress of the flame will be rapidly accelerated. Of a sudden, detonation may occur. A detonation wave travels forward at a nearly uniform rate, combustion proceeding simultaneously and a “ retonation ” wave travels back through the burnt gases from the “ position of detonation " The discovery of the detonation wave by Berthelot and the researches of Mallard and Le Chatelier and of Dixon thereon are matters of history. The purpose of the work described in this communication was to find the position at which a burning mixture of gases would develop a detonation wave under certain fixed conditions. The influence on such position of a change of strength of the combustible gas mixture and then of the nature of the diluent gas was studied. The effect of the addition of small quantities of certain “ antiknock ” compounds has also been investigated.

The prediction of the viscosity of multicomponent, nonpolar gaseous mixtures at atmospheric pressure

AIChE Journal ◽  
1965 ◽  
Vol 11 (3) ◽  
pp. 389-390 ◽  
Author(s):  
Mailand R. Strunk ◽  
Gary D. Fehsenfeld
Keyword(s):  
Atmospheric Pressure ◽  
Gaseous Mixtures

scholarly journals Research on the performance improvement of a two-shaft gas turbine with a variable area nozzle power turbine

2020 ◽  
Vol 24 (6 Part A) ◽  
pp. 3721-3733
Author(s):  
Shiyao Li ◽  
Zhenlin Li ◽  
Hongbin Zhao
Keyword(s):  
Gas Turbine ◽  
Performance Improvement ◽  
Thermal Efficiency ◽  
Atmospheric Pressure ◽  
Atmospheric Temperature ◽  
Atmospheric Conditions ◽  
Fuel Flow ◽  
Power Turbine ◽  
Key Factor ◽  
Isentropic Efficiency

Both an increase in atmospheric temperature and a decrease in atmospheric pressure can lead to the degradation of the maximum allowable power output (MAPO) or the thermal efficiency of a gas turbine. In order to reduce these adverse effects, this paper provides a simulated study on the improvement of the MAPO and the variations of the thermal efficiency due to the fuel flow and variable area nozzle control under different atmospheric conditions. Simulation results indicate that the MAPO increases with the power turbine nozzle area, while the thermal efficiency shows a parabola trend. With the same increment of the power turbine nozzle area, the improvement of the MAPO goes up as the atmospheric temperature rises and the decrease of thermal efficiency is alleviated. Analyses show that the slow degradation of the compressor isentropic efficiency is a key factor that enables the MAPO to increase significantly and the thermal efficiency to remain almost constant.

scholarly journals NON-THERMAL PLASMA AT ATMOSPHERIC PRESSURE AND ITS OPPORTUNITIES FOR APPLICATIONS

2019 ◽  
Vol 62 (8) ◽  
pp. 26-60
Author(s):  
Yuri S. Yuri S. Akishev
Keyword(s):  
Low Temperature ◽  
Atmospheric Pressure ◽  
Cold Plasma ◽  
Specific Energy Consumption ◽  
Gaseous Mixtures ◽  
Equilibrium Plasma ◽  
Dense Gases ◽  
Weakly Ionized ◽  
Kinetics Of ◽  
Non Equilibrium

The subject of this review is the low-temperature (or "cold") weakly-ionized but strongly non-equilibrium plasma created at atmospheric pressure in gaseous mixtures or directly in atmospheric air. Cold plasma is rather new, but very perspective object. The strong non-equilibrium of the weakly-ionized plasma leads to that energetic electrons despite their small quantity very effectively excite and dissociate the neutral particles which are contained in surrounding gas, for example, of a molecule of oxygen and water. The pointed above property of cold plasma is valuable from the practical point of view because it allows creating in plasma-forming gas rather intensive ultra-violet radiation and high concentration of physically and biochemically reactive species (metastable atoms and molecules, radicals, ozone, and others) with rather small specific energy consumption. Now the usage of cold plasma at atmospheric pressure gives the opportunity to solve many practical problems which were earlier seeming unsolvable. It is possible even to claim that the approaches based on the use of cold plasma in dense gases define modern progress in many fields of science, biomedicine and, in particular, in the field of chemical technology. The review of modern experimental methods of creation of the cold plasma at atmospheric pressure is given. Physical and chemical features of cold plasma in dense gases have been considered. Special attention is paid to the kinetics of the charged particles in non-equilibrium plasma and the vibrationally excited molecules as well. Additionally, the kinetics of the electronic excited and metastable states is taken into account because they also influence a biochemical activity of low-temperature plasma. A lot of places is given to concrete examples of the modern practical use of such plasma in ecology for the destruction of the low-concentrated harmful organic and inorganic impurities in the exhausted airflows at atmospheric pressure.

A High-Voltage Terminal for a Field-Emission Gun

1972 ◽  
Vol 30 ◽  
pp. 428-429
Author(s):  
N. F. Ziegler
Keyword(s):  
Field Emission ◽  
High Voltage ◽  
Atmospheric Pressure ◽  
Power Supplies ◽  
High Coherence

A high-voltage terminal has been constructed for housing the various power supplies and metering circuits required by the field-emission gun (described elsewhere in these Proceedings) for the high-coherence microscope. The terminal is cylindrical in shape having a diameter of 14 inches and a length of 24 inches. It is completely enclosed by an aluminum housing filled with Freon-12 gas at essentially atmospheric pressure. The potential of the terminal relative to ground is, of course, equal to the accelerating potential of the microscope, which in the present case, is 150 kilovolts maximum.

Electron microscope characterization of MOCVD-grown gap layers on Si

1986 ◽  
Vol 44 ◽  
pp. 724-725
Author(s):  
K.M. Jones ◽  
M.M. Al-Jassim ◽  
J.M. Olson
Keyword(s):  
Atmospheric Pressure ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Organic Chemical ◽  
Lattice Match ◽  
Si Substrates ◽  
Metal Organic ◽  
Good Lattice ◽  
Antiphase Domains

The epitaxial growth of III-V semiconductors on Si for integrated optoelectronic applications is currently of great interest. GaP, with a lattice constant close to that of Si, is an attractive buffer between Si and, for example, GaAsP. In spite of the good lattice match, the growth of device quality GaP on Si is not without difficulty. The formation of antiphase domains, the difficulty in cleaning the Si substrates prior to growth, and the poor layer morphology are some of the problems encountered. In this work, the structural perfection of GaP layers was investigated as a function of several process variables including growth rate and temperature, and Si substrate orientation. The GaP layers were grown in an atmospheric pressure metal organic chemical vapour deposition (MOCVD) system using trimethylgallium and phosphine in H2. The Si substrates orientations used were (100), 2° off (100) towards (110), (111) and (211).

Microstructure and reactivity of small metal particles: The role of Ce additives

1992 ◽  
Vol 50 (1) ◽  
pp. 318-319
Author(s):  
L.D. Schmidt ◽  
K. R. Krause ◽  
J. M. Schwartz ◽  
X. Chu
Keyword(s):  
Atmospheric Pressure ◽  
Noble Metals ◽  
Mixed Oxides ◽  
Catalytic Properties ◽  
Chemical Shifts ◽  
Catalytic Converter ◽  
Structural Evolution ◽  
Single Particles ◽  
Small Metal Particles

The evolution of microstructures of 10- to 100-Å diameter particles of Rh and Pt on SiO2 and Al2O3 following treatment in reducing, oxidizing, and reacting conditions have been characterized by TEM. We are able to transfer particles repeatedly between microscope and a reactor furnace so that the structural evolution of single particles can be examined following treatments in gases at atmospheric pressure. We are especially interested in the role of Ce additives on noble metals such as Pt and Rh. These systems are crucial in the automotive catalytic converter, and rare earths can significantly modify catalytic properties in many reactions. In particular, we are concerned with the oxidation state of Ce and its role in formation of mixed oxides with metals or with the support. For this we employ EELS in TEM, a technique uniquely suited to detect chemical shifts with ∼30Å resolution.

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