微波合成碳负载纳米铂催化剂及其对甲醇氧化的电催化性能

利用微波辐射快速加热含有XC—72碳的H2PtCl6的乙二醇混合液合成了碳负载的纳米铂,铂负载的质量分数在10％～20％,实验结果表明纳米铂粒子具有均匀的尺寸和形状,其平均粒径在3．6nm,并均匀地分散在纳米碳的表面,循环伏安和恒电位极化表明微波合成的Pt/C比以KBH4作为还原剂制备Pt/C和商业得到E-TEK Pt／C催化剂对甲醇的电化学氧化具有更高的催化活性。     

ON THE MAGNETIC MOMENT OF W± BOSONS IN WEINBERG-SALAM MODEL

We discuss the magnetic moment of W^± bosons in W-S model. First we assume that there is no spontaneous symmetry broking. starting from the formalism of path integrals and using the gauge invariance requirement, we obtain the Ward-Takahashi identities for the 3-line VIB proper vertex functions and prove that its tensor structure is the same form as that of bare vertex couplings, which indicated the W^± bosons have neither anomalous magnetic moment nor electric quadrupole moment. For the realistic case of spontaneous symmetry breaking, we introduce in the Lagrangian an explicit symmetry breaking term. After discussing the problem of analytic continuation for mass of W^± bosons, we prove that prove that the above mentioned conclusion is still valid here.     

THE MICROSCOPIC CALCULATION OF THE STATISTICAL THEORY OF NUCLEAR FISSION

Based on the statistical fission theory, we have calculated the mass and kinetic energy distributions as well as other physical quantities of ²³⁵U fission induced by thermal neutron using microscopical method. That is, the quantum state densities of the fragments at scission point are calculated by means of BCS hamiltonian. The contribution of the collective deformation of fragments to the quantum state density has been taken into consideration. The potential energy of fragment is calculated by means of Strutinski procedure, and the shelling effect, pairing correlation as well as collective deformation have been taken into consideration in calculating the excitation energy at scission point. The scission point distance is treated as an adjustable parameter.Comparing with other statistical fission theories, our results give better agreement with existing experiments.     

常山碱的比色测定法

根据常山碱和异常山碱分子中的喹唑酮能碱水解而形成邻氨基苯甲酸的特点,制订常山植株中碱类含量的比色方法。邻氨基苯甲酸可与经重氮化的N-1-萘基-乙二胺偶合后,于530毫微米处读光密度。此法的灵敏度以光密度值/微克异常山碱/毫升比色液表示为0.111。用此法检查通常用的氯仿萃取法,得知其所回收的常山碱类尚不及实际含量之半。     

THE δ^－－PROBLEM FOR HOLOMORPHIC （0,2）－FORMS ON PSEUDOCONVEX DOMAINS IN SEPARABLE HILBERT SPACES AND D.F.N. SPACES

This paper shows that the δ^--problem for holomorphic (0, 2)-forms on Hilbert spaces is solv-able on pseudoconvex open subsets. By using this result, the authors investigate the existence ofthe solution of the δ^--equation for holomorphic(0, 2)-forms on pseudoconvex domains in D.F.N.spaces.