نتایج جستجو برای: heat capacity

تعداد نتایج: 470848  

Journal: :Journal of chemical information and computer sciences 2004
C. X. Xue Ruisheng Zhang Huanxiang Liu Mancang Liu Zhide Hu Bo Tao Fan

The support vector machine (SVM), as a novel type of learning machine, for the first time, was used to develop a Quantitative Structure-Property Relationship (QSPR) model of the heat capacity of a diverse set of 182 compounds based on the molecular descriptors calculated from the structure alone. Multiple linear regression (MLR) and radial basis function networks (RBFNNs) were also utilized to ...

2009
Wung-Hong Huang

We investigate the thermodynamics of ideal gas on the spacetime with noncommutative fuzzy geometry. We first find that the heat capacity of the ideal boson and fermion on the fuzzy two-sphere have different values, contrast to that on the commutative geometry, and see that the heat capacity approaches to zero in high-temperature limit. We next evaluate the heat capacity of the ideal boson and f...

Journal: :The Journal of chemical physics 2004
Dwaipayan Chakrabarti Biman Bagchi

The heat capacity of a supercooled liquid subjected to a temperature cycle through its glass transition is studied within a kinetic model. In this model, the beta process is assumed to be thermally activated and described by a two-level system. The alpha process is described as a beta relaxation mediated cooperative transition in a double well. The overshoot of the heat capacity during the heat...

1999
A. W. Harter R. A. M. Lee T.C.P. Chui D. L. Goodstein

It has been predicted that the heat capacity of superfluid He will diverge strongly at a depressed transition temperature in the presence of a constant heat flux, Q. We have built a cell to measure this effect, and have taken preliminary measurements at various heat flux values. Our data indicate an enhancement of the heat capacity that varies as a function of Q. However, the temperature depend...

2013
R. Reji Kumar K. Sridhar M. Narasimha

f liquid g gas ABSTRACT The experimental apparatus was build according to the national standards of India.. The performance of the refrigeration system depends upon the heat transfer capacity of the refrigerant. Normally R12, R22, R600, R600a and 134a are used as a refrigerant. This refrigerant heat transfer capacity is not so good and increase power consumption. Due to these limitation nanoflu...

2010
Ludovic Montastruc Pascal Floquet Volker Mayer Iordan Nikov Serge Domenech

Understanding the interaction between a fluid and a solid phase is of fundamental importance to the design of an adsorption process. Because the heat effects associated with adsorption are comparatively large, the assumption of isothermal behavior is a valid approximation only when uptake rates are relatively slow. In this article, we propose to determine when it is needed to choose the isother...

2008
N. R. RAO

In 1937 Pitzer and Smith! measured the heat capacity of silver oxide (Ag 20 ) over the range 13-300 oK and found anomalously high values in the range 20-40 Hysteresis effects were noted with respect to the excess heat capacity. The entropy associated with the anomaly was approximately 0·5 cal °C-l molerl. Kobayashimeasured the heat capacity of silver oxide at higher temperatures and observed a ...

2010
Ying Zhang Chau-Chyun Chen

Accurate modeling of thermodynamic properties for CO2 absorption in aqueous alkanolamine solutions is essential for the simulation and design of such CO2 capture processes. In this study, we use the Electrolyte Nonrandom Two-Liquid activity coefficient model to develop a rigorous and thermodynamically consistent representation for the MDEA-H2O-CO2 system. The vapor-liquid equilibrium (VLE), hea...

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