A lot of predictive methods for predicting the high-pressure vapor-liquid equilibria have been proposed using cubic equations of state and excess free energy mixing rule. This paper deals with the proposal of MHV1-SA model that is obtained by combination of SRK cubic equation of state and MHV1 mixing rule with ASOG group contribution model. The high-pressure vapor-liquid equilibria for five systems have been predicted using ASOG group pair parameters for low pressure. The ASOG group pair parameters for 30 group pairs relating to group CO2 and CH4 have been then determined newly using high-pressure vapor-liquid equilibrium data. The high-pressure vapor-liquid equilibria for the systems containing carbon dioxide and methane have been predicted, and the comparison of this work has made with the predicted results using PSRK, LCVM, and PRASOG.
Trans-1,4-Polybutadiene (TPBD) transforms a crystal structure at the temperature of heat storage. In this study, the molecular structure of TPBD was measured using the Raman spectroscopy. The measurement of the amount of heat storage of TPBD was performed using a differential scanning calorimetry. It is found that there is a correlation between the amount of heat storage and the change of C-H bond by auto-oxidation. A thermal cycle test was carried out to obtain the change of heat storage and release amount of TPBD. The heat storage and release amount was calculated from the obtained temperature history. The heat storage amount became between 60 J/g and 90 J/g. The heat release amount became between -70 J/g and -100 J/g. It is verified that the amount of heat storage of TPBD does not deteriorate during 1700 cycles.
We conducted measurements of the thermal resistance of individual multi-walled carbon nanotubes (MWNT) defected by focused ion beam (FIB) irradiation to investigate the effect of amorphization of ballistic thermal transport. Obtained results for three samples with many kinds of irradiated points show that the first irradiation gives the largest thermal resistance and the resistance added by each FIB irradiation decreases as the number of defects increases. This result suggests that the thermal transport in nanoscale material is not diffusive but the simple model does not hold, that the thermal conductivity is proportional to power-law of length.