THE SYMMETRY OF STRATONS IN

In this paper,the color symmetry of stratons for a theoretical model proposed some times ago is investigated.This symmetry contains two kinds of transformations, the first is color gauge transformations which leave the color mumber of stratons conserved,the second is color permutations which indicate the equivaluence of dif- ferent color stratons.The structure of this symmetry group（S3α）is investigated.The irreducible representations（IR's）of S3α and the reduction of their direct product are given.The relation between IR's of S3α and those of color U（3）group is discussed. In a simplest physical model only two neutral vector gluons are needed and the super-strong ihteraetions among stratons exhibit saturation properties similar to but somewhat different from the case of the Han-Nambu model.Not only the color singlet, but also other color neutral states belonging to IR's 2 or 1 of S3α all belong to the lowest energy level of the super-strong interactions.If there were eight degenerate vector gluons belonging to IR's 2 and 6,the Han-Nambu model would be reproduced.     

5,5-dimethyl-1,3-dioxan-4-ol as orthogonally protected equivalent of 2,2-dimethyl-3-hydroxypropanal

Condensation of isobutyraldehyde with aqueous formaldehyde in the presence of Ba(OH)2 gave a new gem-dimethyl-substituted building block.     

Synthesis of the northern fragment of an epothilone D analogue from (−)-carvone

A simple and effective synthesis of the chiral thiazole-containing fragment of an epothilone D analogue from (?)-carvone is described.     

Ultrasonic study of the phase diagram of methanol

The phase diagram of methanol is studied by an ultrasonic technique over the temperature range 90–290 K at pressures up to 1.2 GPa. The pressure and temperature dependence of the velocity of longitudinal ultrasonic waves and the density of crystalline and liquid phases has been determined. Weak anomalies in the velocity of ultrasound in the liquid phase of methanol and the corresponding anomalous additional compression of the liquid at 230–250 K and 0.2–0.6 GPa have been found, and they are likely attributable to structural changes in the liquid phase.     

酰氨基硫脲及其相关杂环衍生物的研究——Ⅱ.1-[5-(α-萘)-2 H-四唑-2-乙酰]-4-苯基氨基硫脲及其相关杂环衍生物的合成

本文合成了1-[5-(α-萘)-2 H-四唑-2-乙酰]-4-苯基氨基硫脲5,以及由5衍生的环化产物3-[5-(α-萘)-2 H-四唑-2-甲撑]-4-苯基-1,2,4-三唑啉-5-硫酮6,2-苯胺基-5-[5-(α-萘)-2 H-四唑-2-甲撑]-1,3,4-噻二唑7及2-苯胺基-5-[5-(α-萘)-2 H-四唑-2-甲撑]-1,3,4-(口恶)二唑8。它们的结构均通过元素分析,红外光谱,核磁共振及质谱鉴定。其药理实验正在进行中。初步实验表明,5及6对小麦生长有较强的促进作用。     

Elastic properties of crystalline and liquid gallium at high pressures

The elastic properties of gallium, such as the bulk modulus B, the shear modulus G, and the Poisson’s ratio σ, are investigated and the relative change in the volume is determined in the stability regions of the Ga I, Ga II, and liquid phases at pressures of up to 1.7 GPa. The observed lines of the Ga I-Ga II phase transition and the melting curves of the Ga I and Ga II phases are in good agreement with the known phase diagram of gallium; in this case, the coordinates of the Ga I-Ga II-melt triple point are determined to be 1.24 ± 0.40 GPa and 277 ± 2 K. It is shown that the Ga I-Ga II phase transition is accompanied by a considerable decrease in the moduli B (by 30%) and G (by 55%) and an increase in the density by 5.7%. The Poisson’s ratio exhibits a jump from typically covalent values of approximately 0.22–0.25 to values of approximately 0.32–0.33, which are characteristic of metals. The observed behavior of the elastic characteristics is described in the framework of the model of the phase transition from a “quasi-molecular” (partially covalent) metal state to a “normal” metal state. An increase in the Poisson’s ratio in the Ga I phase from 0.22 to 0.25 with an increase in the pressure can be interpreted as a decrease in the degree of covalence, i.e., the degree of spatial anisotropy of the electron density along the bonds, whereas the large value of the pressure derivative of the bulk modulus (equal to approximately 8) observed up to the transition to the Ga II phase or the melt is associated not only with the quasicovalent nature of the Ga I phase but also with the structural features. In view of the presence of seven neighbors for each gallium atom in the Ga I phase, the gallium lattice can be treated as a structure intermediate between typical open-packed and close-packed structures. Premelting effects, such as a flattening of the isothermal dependence of the shear modulus G(p) with increasing pressure and an increase in the slope of the isobaric dependences G(T) with increasing temperature, are revealed in the vicinity of the melting curve. The bulk modulus of liquid gallium near the melting curve proves to be rather close to the corresponding values for the normal metal Ga II.     

流体静高压原位磁测量的误差研究（二）──退磁场的影响

 为了探讨流体静高压原位磁测量中退磁场的影响有多大？分别选用6种不同片数（n＝1、3、5、7、10、13）的非晶Fe_46.3Co_0.03Ni_46.5Si_3.75V_0.92B_2.5合金薄带样品，先后放进13层密绕直螺线管初级线圈内，采用工业频率400 Hz去测量和比较其磁化曲线、磁导率曲线和起始磁化曲线。研究表明：（1）样品片数越多，退磁场的影响越大，导致μ_m和μ_i出现惊人的测量误差，以1片（μ_m＝4 430，μ_i＝3 396）为最准。（2）随着样品片数的增多，测量饱和磁感应强度B_s＝0.837～0.762T，表明受退磁场影响较小。（3）若要减小退磁场误差，可将样品做得更薄，如0.2 μm薄膜。（4）若要彻底消除退磁场误差，必须采用闭合磁路，如用非晶合金薄带卷成的圆环。