scholarly journals Temperature Field Distribution and Thermal Stability of Roadbed in Permafrost Regions

2021 ◽  
Vol 39 (1) ◽  
pp. 241-250
Author(s):  
Youkun Cheng ◽  
Zhenwu Shi ◽  
Fajin Zu
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Temperature Field ◽  
Frozen Soil ◽  
Western China ◽  
Insulation Material ◽  
Structural Factors ◽  
Term Operation ◽  
Thermal Stability Of ◽  
Permafrost Regions

Many highways and railways in western China are built on permafrost roadbed. Frost heave and thaw settlement might cause diseases to frozen soil roadbed, such as deformation and cracking. For long-term operation, frozen soil roadbed should be kept stable and durable. Therefore, this paper analyzes the distribution law of temperature field of roadbed in permafrost regions, under the effect of thermal stability. Based on the thermodynamic properties of permafrost, the authors analyzed the influence of engineering geological factors, roadbed structural factors, and natural environmental factors on the thermal stability of frozen soil roadbed. Next, the antifreeze mechanism of frozen soil roadbed was described, together with the calculation methods for the relevant parameters. Afterwards, the temperature field of the roadbed with low thermal conductivity insulation material was analyzed by two methods, namely, steady-state thermal analysis and transient thermal analysis, and the solving process of roadbed temperature field was explained in details. The proposed analysis method and solving algorithm were proved valid through experiments. The research results provide a reference for the reasonable design of frozen soil roadbed.

Study of thermal stability of n-type skutterudites Sr0.07Ba0.07Yb0.07Co4Sb12 by differential thermal analysis and Knudsen effusion method

Calphad ◽  
2021 ◽  
Vol 73 ◽  
pp. 102258
Author(s):  
František Zelenka ◽  
Jakub Strádal ◽  
Pavel Brož ◽  
Jan Vřešťál ◽  
Jiří Buršík ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Knudsen Effusion ◽  
Knudsen Effusion Method ◽  
Effusion Method ◽  
Thermal Stability Of

Organic solvent-free synthesis of phosphorus-containing polymers

2007 ◽  
Vol 79 (11) ◽  
pp. 1879-1884 ◽  
Author(s):  
Smaranda Iliescu ◽  
Gheorghe Ilia ◽  
Aurelia Pascariu ◽  
Adriana Popa ◽  
Nicoleta Plesu
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Bisphenol A ◽  
Organic Solvent ◽  
Molar Mass ◽  
Interfacial Polycondensation ◽  
H Nmr ◽  
Phosphorus Containing ◽  
Solvent Free Synthesis ◽  
Thermal Stability Of

Direct, efficient, organic solvent- and catalyst-free synthesis of a series of polyphosphates was accomplished. The reaction involved a gas-liquid interfacial polycondensation between arylphosphoric dichlorides and bisphenol A. The polyphosphates were characterized by IR, 1H NMR, 31P NMR, inherent viscosity, thermal analysis, and molar mass. Yields in the range 70-90 % and inherent viscosities in the range 0.30-0.40 dl/g were obtained. The thermal stability of the polyphosphates was investigated by using thermogravimetry.

Synthesis and thermal stability of imino-1,3-dithietanes. Influence of structural factors

2009 ◽  
Vol 58 (2) ◽  
pp. 430-436 ◽  
Author(s):  
V. A. Ogurtsov ◽  
Yu. V. Karpychev ◽  
P. A. Belyakov ◽  
Yu. V. Nelyubina ◽  
K. A. Lyssenko ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Structural Factors ◽  
Thermal Stability Of

scholarly journals Thermal stability and thermal decomposition of sucralose

2018 ◽  
Vol 39 (4) ◽  
pp. 21
Author(s):  
Gilbert Bannach ◽  
Rafael R. Almeida ◽  
Luis G. Lacerda ◽  
Egon Schnitzler ◽  
Massao Ionashiro
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Differential Scanning Calorimetry ◽  
Thermal Decomposition ◽  
Differential Thermal Analysis ◽  
Infrared Spectroscopy ◽  
Scanning Calorimetry ◽  
Thermoanalytical Techniques ◽  
Thermal Stability Of

Several papers have been described on the thermal stability of the sweetener, C12H19Cl3O8 (Sucralose). Nevertheless no study using thermoanalytical techniques was found in the literature. Simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC) and infrared spectroscopy, have been used to study the thermal stability and thermal decomposition of sweetener.

PS-TiO2 Nanocomposites: Thermal Investigations

2011 ◽  
Vol 1312 ◽  
Author(s):  
Rafael Villegas ◽  
Yun Zhai ◽  
Hailan Xu ◽  
Dorina Magdalena Chipara ◽  
David Hui ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Thermogravimetric Analysis ◽  
Mass Loss ◽  
Correlation Coefficient ◽  
Analysis Data ◽  
First Derivative ◽  
Thermal Investigations ◽  
Thermal Stability Of ◽  
Gaussian Line

ABSTRACTNanocomposites of polystyrene loaded with various amounts of anatase (ranging between 0 % wt. and 20 % wt.) have been synthesized and investigated by thermal analysis. The research was focused on the simulation of Thermogravimetric Analysis data, aiming to a refined understanding of the interactions between of polystyrene and TiO2 nanoparticles. The dependence of the first derivative of residual mass on temperature has been used to determine more accurately the temperature at which the mass loss is maxim. Several functions have been used to simulate the dependence of the first derivative of mass loss on the temperature of the sample. The highest correlation coefficient was obtained for the asymmetric Gaussian combination, which connects two halves of a Gaussian line with different linewidth. An increase of the thermal stability of the polymeric matrix upon loading with TiO2 is reported.

Using thermal analysis and kinetics calculation method to assess the thermal stability of azobisdimethylvaleronitrile

2019 ◽  
Vol 138 (4) ◽  
pp. 2853-2863 ◽  
Author(s):  
Chen-Rui Cao ◽  
Shang-Hao Liu ◽  
Jen-Hao Chi ◽  
Yet-Pole I ◽  
Chi-Min Shu
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Calculation Method ◽  
Thermal Stability Of

The thermal stability of roadbed in permafrost regions along Qinghai–Tibet Highway

2003 ◽  
Vol 37 (1) ◽  
pp. 25-34 ◽  
Author(s):  
Shaoling Wang ◽  
Fujun Niu ◽  
Lin Zhao ◽  
Shuxun Li
Keyword(s):  
Thermal Stability ◽  
Thermal Stability Of ◽  
Permafrost Regions
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