Effect of TiB2 and Boron Additions on the Stability of Wurtzite-Type Boron Nitride at High Temperatures and Pressures

Shock-synthesized wurtzite-type BN(w-BN) and mixtures of w-BN–TiB₂ and w-BN–ß were treated at high temperatures and pressures. The effect of TiB₂ and boron additions on the transformation of w-BN to zinc blende-type BN(z-BN) was studied at 1000° to 2200°C and 55 to 68 kbars. The formation region of z-BN was shifted toward higher temperatures by TiB₂ additions and toward lower temperatures by boron additions.     

新型热敏性高分子的合成与溶液特性

采用分子设计方法 ,合成了 2种新型单体 ,用核磁共振 (NMR)表征了其分子结构 .研究了各种溶剂和引发剂浓度对聚合反应的影响 .用凝胶色谱 (GPC)分析了聚合物的相对分子质量分布 .通过对聚合物水溶液特性的表征 ,确认了得到的高分子产物对温度的变化具有很高的敏感性 ,是一种新型的热敏性材料 .     

A dynamical existence problem of macroeconomic policy model

The paper presents a procedure for the construction of a minimal dimension stato-spaeo representation for macroeconomic policy model. By using the results obtained here, the present paper clarifies the relationships among the minimal realization of the model, the basic concepts of controllability and observability, and dynamic policy existence. Thus, the paper shows a dynamic generalization of Tinbergen's theory of policy formation.     

Structure of Inclusion Complexes of Cyclodextrins with Triglyceride at Vegetable Oil/Water Interface

The interfacial tension of vegetable oil (soybean oil or coconut oil)/ water interface decreased with the increase of cyclodextrin (CD) concentration. The interfacial excess and interfacial area were calculated from the Gibbs’ adsorption equation. The average number of CD molecules including a fatty acid residue of soybean oil at the interface was estimated at 2.4 for each of α-CD and β-CD. The average number of CD molecules complexed with a fatty acid residue of coconut oil was 1.8 for α-CD and 1.7 for β-CD. These results suggested that the CD molecules formed the inclusion complex with the triglyceride according to the chain length of fatty acid residue at the interface.     

Cholesterol Lowering Activity of Ropy Fermented Milk

The effect of ropy fermented milk on serum cholesterol in rats was studied. Basic diets containing slime-forming Lactococcus lactis subsp. cremoris SBT 0495, its non slime-forming variant SBT 1275, and acidified reconstituted skim milk, with 0.5% cholesterol added, were fed to F-344 rats for 7 days. Serum cholesterol level of rats fed the ropy fermented milk were the lowest among the three treatments. The serum high-density lipoprotein (HDL) cholesterol/total cholesterol ratio of rats fed ropy fermented milk was the highest. Slime materials produced by L. lactis subsp. cremoris SBT 0495 had a beneficial effect on rat cholesterol metabolism.     

High Efficiency Drive Method of an Open‐Winding Induction Machine Driven by Dual Inverter Using Capacitor Across dc Bus

This paper proposes a highly efficient drive method for an open‐winding induction machine with a single constant voltage source and a single capacitor. By focusing on the phase voltage of the open‐winding machine, which is determined by the phase difference and the dc voltage of each power converter, it is possible to control the peak value of the phase voltage by controlling the voltage of the capacitor. Thus, a reduction in the iron loss due to harmonic voltage in the open‐winding machine is expected. In the proposed method, the voltage of the capacitor is controlled by the difference between the two reference voltages of the power converter, which depends on the machine power factor and the phase difference of the power converter connected to both ends of the winding. Based on experimental results, the converter loss and the machine loss can be reduced by controlling the voltage of the capacitor in accordance with the machine speed using the proposed method.     

Analyses of crime control by a total criminal justice system model of feedback type with aging effect considered

The recent increase in offences has provoked a call for longer prison terms under the assumption that longer prison terms reduce offences. A critical barrier to examining this assumption is the unavailability of consistent data on offences and the recidivism due to the separation of various agencies in the criminal justice. This paper examines the assumption by proposing a total system model over separated agencies to estimate the figures needed. This model also enables one to forecast the caseload of the system and to identify critical factors for crime control.     

Solution behaviour of new cationic surfactants derived from Guerbet alcohols and their use in hair conditioners

The solution behaviour of new cationic surfactants, synthesized by using long-chain Guerbet alcohols, in water was investigated by a polarizing microscopic technique, differential scanning calorimetry, and electric conductivity measurements. These surfactants show the gel–liquid crystalline phase transition to be lower than 0°C and form lamellar liquid crystals even in cold water and at low concentrations of surfactants. The sorption of cationic surfactants from aqueous solutions onto hair was determined as a function of temperature. The effect of adsorbed cationic surfactants on the critical surface tension and kinetic frictional coefficients of hair surface have been investigated. These surface characteristics of hair treated with quaternary ammonium compounds derived from Guerbet alcohols were found to be significantly improved. These results can be explained by the high ability of sorption onto hair. Hair rinses and conditioners having excellent ease of combing or brushing for wet and dry hair can be formulated by the application of these cationic surfactants.