Magnetic and thermodynamic properties of EuS/SrS multilayers at low temperatures

1989 ◽  
Vol 77 (1) ◽  
pp. 25-32 ◽  
Author(s):  
J. Wosnitza ◽  
H. v. L�hneysen ◽  
U. Walz ◽  
W. Zinn
Keyword(s):  
Thermodynamic Properties ◽  
Low Temperatures

Reaction model and thermodynamic properties between sulfur-containing active groups and oxygen during coal self-heating

2021 ◽  
Vol 99 (1) ◽  
pp. 31-42
Author(s):  
Xuyao Qi ◽  
Liangzhou Chen ◽  
Jie Tang ◽  
Haihui Xin ◽  
Zhongqiu Liang
Keyword(s):  
Thermodynamic Properties ◽  
Low Temperatures ◽  
Structural Parameters ◽  
Reaction Model ◽  
Main Reaction ◽  
Chain Reactions ◽  
Self Heating ◽  
Oxidation Stage ◽  
Chemistry Calculation ◽  
Sulfur Containing

To further study the mechanism of coal self-heating, the reaction sequences and thermodynamic properties between sulfur-containing groups and oxygen during coal self-heating were analyzed. The benzyl mercaptan and diphenyl sulfide were selected as typical sulfur-containing structures existing in coal. Their structural parameters, frontier orbital characteristics, and thermodynamic parameters were analyzed through quantum chemistry calculation and their detailed reaction sequences with oxygen were proposed. The results indicate that the thiol structure in coal can easily react with oxygen at low temperatures and release large amounts of heat (146.70 kJ/mol) during coal self-heating, providing active free radicals and energy for subsequent chain reactions of coal spontaneous combustion. The oxidation reaction between the thioether structure and oxygen cannot occur at room temperature. With the accumulation of heat, thioether gradually becomes active and reacts with oxygen to form sulfoxide and release an enormous amount of heat (248.09 kJ/mol), which can be further oxidized to sulfone with an increase in temperature. The reaction models of thiol and thioether groups during coal self-heating were proposed, which involves eight main reaction sequences (R1∼R8). It indicates that the reactions of thiol and thioether groups play crucial roles during the evolution of coal self-heating, with a slow oxidation stage at low temperatures and an accelerated oxidation stage at high temperatures.

Thermodynamic properties of erbium mono-and disilicide at low temperatures

2007 ◽  
Vol 46 (1-2) ◽  
pp. 72-76 ◽  
Author(s):  
N. P. Gorbachuk ◽  
S. N. Kirienko ◽  
V. R. Sidorko ◽  
I. M. Obushenko
Keyword(s):  
Thermodynamic Properties ◽  
Low Temperatures

scholarly journals Two-phase equilibrium in binary and ternary systems - IV. The thermodynamic properties of propane

1940 ◽  
Vol 176 (965) ◽  
pp. 280-294 ◽  
Keyword(s):  
Phase Equilibrium ◽  
Thermodynamic Properties ◽  
Low Temperatures ◽  
Ternary Systems ◽  
Two Phase ◽  
Thermal Data ◽  
Binary And Ternary Systems

Existing physical and thermal data relative to propane have been summarized and correlated, and some new experimental determinations of pressure-volume-temperature relationships for the liquid at low temperatures have been carried out to make good deficiencies in the literature. On the basis of the information thus obtained the entropy and enthalpy of propane have been calculated for conditions of temperature between — 80 and 200° C, and at pressures of from 0.1 to 200 atm. The results are tabulated and also presented graphically on a temperature base.

scholarly journals Molecular Dynamics Calculation of the Thermodynamic Properties of Methane

1975 ◽  
Vol 28 (3) ◽  
pp. 315 ◽  
Author(s):  
HJM Hanley ◽  
RO Watts
Keyword(s):  
Molecular Dynamics ◽  
Thermodynamic Properties ◽  
Specific Heat ◽  
Low Temperatures ◽  
Spherically Symmetric ◽  
Method Of Molecular Dynamics ◽  
Experimental Values ◽  
Dynamics Calculation ◽  
Liquid States ◽  
Three Body

Thermodynamic properties of methane in the dense gas and liquid states have been calculated by the method of molecular dynamics. The methane pair interactions were modelled using a spherically symmetric m-6-8 potential, and the most significant three-body and quantum effects were included. Agreement between calculated and experimental values for the energy and pressure is generally good except at low temperatures and high densities. The specific heat at constant volume is also briefly discussed.

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