scholarly journals Forecasting of an output of eco toxicants at thermal decomposition of chemical fuel

2019 ◽  
Vol 140 ◽  
pp. 08002
Author(s):  
Olga Barysheva ◽  
Renat Sadykov ◽  
Yuri Khabibullin ◽  
Elizaveta Zheltukhina
Keyword(s):  
Thermal Decomposition ◽  
Combustion Products ◽  
High Energy ◽  
Chemical Balance ◽  
Method Of Determination ◽  
Dioxins And Furans ◽  
Determination Of Parameters ◽  
Different Levels ◽  
High Energy Chemical

Combustion of high-energy chemical fuels containing chlorine in the element structure can lead to formation in the particles of smoke of super eco toxicants—the polychlorinated dioxins and furans. The numerical experiment conducted was based on solution of the equations of chemical kinetics. The computational and theoretical researches directed to the solution of a problem of determination of parameters of combustion products of chemical fuels taking into account formation of harbingers of the polychlorinated dioxins were executed. The main data on the accepted method of determination of disequilibrium structures of products of burning the chlorine-containing chemical fuels were represented. Based on the analysis of references about mechanisms and speeds of chemical reactions of transformations of chlorine-containing connections, the kinetic model of formation of predecessors of dioxins is constructed. The carried-out calculations showed (assuming chemical balance) that process of formation of dioxins is significantly disequilibrious. The results of kinetic researches on emission of harbingers of dioxins showed the nature of the influence of different components of combustion products of chemical fuels on time for the different levels of temperatures.

A New Method of Determination of Parameters of Traps in Semiconductors

1998 ◽  
Vol 210 (2) ◽  
pp. 805-808
Author(s):  
V.M. Aroutiounian ◽  
V.V. Bouniatian ◽  
S.Sh. Gevorgian ◽  
P. Soukiassian
Keyword(s):  
New Method ◽  
Method Of Determination ◽  
Determination Of Parameters

scholarly journals Calculation of pressure loss and critical velocity for slurry flows with additive agents in vertical polyethylene pipelines

2019 ◽  
Vol 109 ◽  
pp. 00083 ◽  
Author(s):  
Yevhen Semenenko ◽  
Stepan Kril ◽  
Olha Medvedieva ◽  
Nina Nykyforova ◽  
Larysa Tatarko
Keyword(s):  
Critical Velocity ◽  
Pressure Loss ◽  
Hydraulic Gradient ◽  
Fall Velocity ◽  
Solid Materials ◽  
Method Of Determination ◽  
Slurry Flows ◽  
Determination Of Parameters ◽  
Parameters Calculation

The method of determination of parameters of hydrotransport of solid polydisperse materials in vertical pipelines is offered. The reasons of discrepancy between estimated and observed data when using A. Smoldyrev’s method for calculation of hydraulic gradient and critical velocity in vertical steel pipelines are analysed. Particularly non-applicability of Velicanov principle to hydrotransport of solid materials in vertical pipelines is proved and contribution of particles fall velocity to the value of complementary hydraulic gradient in vertical pipelines is estimated. Suggested formulas for calculation of hydraulic gradient and critical velocity in vertical pipelines are multipurpose because they may be used for calculation of hydrotransport parameters in steel and polymeric vertical pipelines with using of friction reducing agents and without it. The method for parameters calculation of solid materials hydrotransport in vertical polymeric pipelines is first offered. Elaborated formulas ensure also increasing of accuracy of calculations.

scholarly journals Determination of Parameters of the Moulding Sand Reclamation Process, on the Thermal Analysis Bases

2014 ◽  
Vol 59 (3) ◽  
pp. 1023-1027 ◽  
Author(s):  
M. Łucarz ◽  
B. Grabowska ◽  
G. Grabowski
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
The Other ◽  
Environment Protection ◽  
Degradation Mechanisms ◽  
Thermal Decomposition Process ◽  
Thermal Tests ◽  
Determination Of Parameters ◽  
Reclamation Process

Abstract For the practical and functional reasons the investigation of the thermal decomposition process is of an essential meaning in relation to the thermal stabilisation of materials and obtaining for them the desired thermal properties. On the other side, thermal tests are carried out in order to identify degradation mechanisms, which is important in the environment protection context, including materials reuse. The cycle of investigations in which thermal TG-DTA methods were applied as supplementary ones for the works on the optimisation of the thermal reclamation process is presented in the hereby paper. The thermal reclamation process as a utilisation method of spent moulding and core sands is more costly than other reclamation methods, but in the majority of cases it simultaneously provides the best cleaning of mineral matrices from organic binders. Thus, the application of the thermal analysis methods (TG-DTA), by determining the temperature range within which a degradation followed by a destruction of bounded organic binders in moulding sands, can contribute to the optimisation of the thermal reclamation process and to the limiting its realisation costs.

Kinematic Approximations in TED and RHEED Analysis of Reconstructed Surfaces

1990 ◽  
Vol 48 (2) ◽  
pp. 396-397
Author(s):  
L. -M. Peng ◽  
M. J. Whelan
Keyword(s):  
Electron Diffraction ◽  
Kinematic Analysis ◽  
Incident Beam ◽  
High Energy ◽  
Energy Electron ◽  
Great Success ◽  
High Energy Electron ◽  
Kinematic Approximation ◽  
Reconstructed Surfaces

In recent years there has been a trend in the structure determination of reconstructed surfaces to use high energy electron diffraction techniques, and to employ a kinematic approximation in analyzing the intensities of surface superlattice reflections. Experimentally this is motivated by the great success of the determination of the dimer adatom stacking fault (DAS) structure of the Si(111) 7 × 7 reconstructed surface.While in the case of transmission electron diffraction (TED) the validity of the kinematic approximation has been examined by using multislice calculations for Si and certain incident beam directions, far less has been done in the reflection high energy electron diffraction (RHEED) case. In this paper we aim to provide a thorough Bloch wave analysis of the various diffraction processes involved, and to set criteria on the validity for the kinematic analysis of the intensities of the surface superlattice reflections.The validity of the kinematic analysis, being common to both the TED and RHEED case, relies primarily on two underlying observations, namely (l)the surface superlattice scattering in the selvedge is kinematically dominating, and (2)the superlattice diffracted beams are uncoupled from the fundamental diffracted beams within the bulk.

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