An Extended Regular Solution Model with Local Volume Fraction|
The regular solution model (the Hildebrand-Scatchard equation) coupled with the Flory-Huggins equation has been extended by using the local volume fraction proposed by Wilson so that it can be applied to polar mixtures. From the extended regular solution model, activity coefficient equations can be derived. Pair energy parameters required to evaluate local volume fractions can be estimated by solubility parameters and molar volumes predicted from the molecular structures of constituent pure components by using additive methods. The applicability of the present regular solution model is examined by correlating vapor-liquid equilibria of several ethanol + hydrocarbon binary systems, and it is found that the proposed model can be adopted for polar mixtures.
Correlation of Vapor-Liquid Equilibria for Mixtures Containing Polar
Molecules by Regular Solution Model with Local Volume Fraction|
The regular solution model (the Hildebrand-Scatchard equation) coupled with the Flory-Huggins equation has been extended by using the local volume fraction of Wilson to be applicable to correlate vapor-liquid equilibria (VLE) of polar mixtures. The extended regular solution model with the local volume fraction (RSM-L) has been applied to ethanol + hydrocarbon binary mixtures in a previous study and it is found that the model can be correlate VLE of the mixtures. In this study, as a continuation, RSM-L is adopted to correlate VLE of other polar binary mixtures containing ethers, ketones and water and its applicability is examined and discussed.
This study deals with a questionnaire survey on consciousness of disaster prevention of students of Yamaguchi University who have experience of heavy rain on July, 2009. Yamaguchi University has two campuses. One is Yoshida campus located in Yamaguchi city and the other is Tokiwa Campus located in Ube city. The results of the questionnaire are compared between the students who are in Yoshida campus and in Tokiwa campus. The following results are obtained from our survey; 1) Although they recognize importance of disaster preventions, they hardly make a disaster prevention action. 2) The students who are in Yoshida campus have interest and anxiety on flood disasters in comparison with ones who are in Tokiwa campus. It could be said that the experience of the heavy rain affected the consciousness of disaster preventions of the students who in Yoshida campus.