Autowave propagation in an active medium with a constant concentration of an intermediate reagent at the reactor wall

1985 ◽  
Vol 20 (5) ◽  
pp. 572-576
Author(s):  
O. M. Roizman ◽  
A. N. Zaikin
Keyword(s):  
Active Medium ◽  
Reactor Wall ◽  
Constant Concentration ◽  
Autowave Propagation

MAGNETOFLUIDIC MATERIAL AS AN ACTIVE MEDIUM FOR ACOUSTICAL SENSORS

1990 ◽  
Vol 51 (C2) ◽  
pp. C2-903-C2-906
Author(s):  
M. A. SARBU ◽  
M. I. PISO
Keyword(s):  
Active Medium

A Prototype of Electric Discharge Gas-Flow Oxygen–Iodine Laser: 2. Simulation of the Parameters of the Active Medium Formed in a Gas-Flow Slab RF Discharge in O2 : He : CF3I Mixtures

2020 ◽  
Vol 46 (11) ◽  
pp. 1114-1123
Author(s):  
N. P. Vagin ◽  
A. A. Ionin ◽  
A. Yu. Kozlov ◽  
I. V. Kochetov ◽  
A. P. Napartovich ◽  
...  
Keyword(s):  
Active Medium ◽  
Electric Discharge ◽  
Gas Flow ◽  
Rf Discharge ◽  
Iodine Laser ◽  
Discharge Gas

The effect of electrondonors on the polymerization kinetics of isoprene

1980 ◽  
Vol 45 (12) ◽  
pp. 3338-3346
Author(s):  
Miroslav Kašpar ◽  
Jiří Trekoval
Keyword(s):  
Induction Period ◽  
Ethyl Ether ◽  
Reaction Order ◽  
Propagation Rate ◽  
Reaction Scheme ◽  
Polymerization Kinetics ◽  
Polymerization Rate ◽  
Constant Concentration ◽  
Initial Concentration ◽  
Kinetics Of

The effect of small additions of 1-octene, butyl ethyl ether and triethylamine on the polymerization kinetics of isoprene (2-methyl-1,3-butadiene) in benzene initiated with butyllithium was investigated by employing the GLC analysis. The addition of 1-octane was reflected only in a shorter induction period of the reaction; the effect on the propagation rate was insignificant. With the increasing amount of butyl ethyl ether, the polymerization rate increases linearly, while the reaction order with respect to the concentration of triethylamine is variable and increases from 0.33 to 0.66 with the increasing concentration of the initiator. For a constant concentration of triethylamine, the reaction order with respect to the initial concentration of the initiator was found to vary considerably, reaching even negative values. A reaction scheme was suggested, taking into account the competition between two different solvates of alkyllithium.

Influence of a radial inhomogeneity of the active medium on the output radiation power from a cw CO2 laser with fast axial flow

1996 ◽  
Author(s):  
Michail G. Galushkin ◽  
Vladimir S. Golubev ◽  
V. V. Dembovetsky ◽  
Yuri N. Zavalov ◽  
Valentina Y. Zavalova
Keyword(s):  
Active Medium ◽  
Co2 Laser ◽  
Radiation Power ◽  
Axial Flow ◽  
Output Radiation ◽  
Radial Inhomogeneity ◽  
Cw Co2 Laser ◽  
Output Radiation Power

Neutron pumping of active medium formed by gadolinium isotopes Gd155 and Gd156 pair

2021 ◽  
Vol 171 ◽  
pp. 109649
Author(s):  
Igor V. Shamanin ◽  
Mishik A. Kazaryan ◽  
Sergey V. Bedenko ◽  
Vladimir V. Knyshev ◽  
Vitaly I. Shamanin
Keyword(s):  
Active Medium

scholarly journals Influence of Macroscopic Wall Structures on the Fluid Flow and Heat Transfer in Fixed Bed Reactors with Small Tube to Particle Diameter Ratio

Processes ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 689
Author(s):  
Thomas Eppinger ◽  
Nico Jurtz ◽  
Matthias Kraume
Keyword(s):  
Heat Transfer ◽  
Fixed Bed ◽  
Particle Diameter ◽  
Diameter Ratio ◽  
Spherical Particles ◽  
Reactor Wall ◽  
Entry Length ◽  
Fixed Bed Reactors ◽  
Wall Structures ◽  
Small Tube

Fixed bed reactors are widely used in the chemical, nuclear and process industry. Due to the solid particle arrangement and its resulting non-homogeneous radial void fraction distribution, the heat transfer of this reactor type is inhibited, especially for fixed bed reactors with a small tube to particle diameter ratio. This work shows that, based on three-dimensional particle-resolved discrete element method (DEM) computational fluid dynamics (CFD) simulations, it is possible to reduce the maldistribution of mono-dispersed spherical particles near the reactor wall by the use of macroscopic wall structures. As a result, the lateral convection is significantly increased leading to a better radial heat transfer. This is investigated for different macroscopic wall structures, different air flow rates (Reynolds number Re = 16 ...16,000) and a variation of tube to particle diameter ratios (2.8, 4.8, 6.8, 8.8). An increase of the radial velocity of up to 40%, a reduction of the thermal entry length of 66% and an overall heat transfer increase of up to 120% are found.

PENETRATION OF RADIOACTIVE ISOPROPYL METHYLPHOSPHONOFLUORIDATE (SARIN) VAPOR THROUGH SKIN

1960 ◽  
Vol 38 (9) ◽  
pp. 935-944 ◽  
Author(s):  
M. K. McPhail ◽  
P. A. Adie
Keyword(s):  
Exposure Time ◽  
Vapor Concentration ◽  
Constant Concentration ◽  
Time Required

Studies have been made of the penetration of sarin (isopropyl methylphosphonofluoridate) tagged with P32 through the skin of rabbits. Sarin vapor at a constant concentration was passed through a plastic cup attached to the clipped bellies of rabbits. Using different sizes of cups it has been found that the L(ct)50 (concentration × exposure time required to kill 50% of the animals exposed) decreased as the exposure area was increased. From these experiments it was possible to determine how absorption through skin varies with area exposed, vapor concentration, and exposure time and to find the approximate 'ct' necessary to kill a rabbit for any area of skin exposed.

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