杂多阴离子柱撑锰铝水滑石的合成、表征及催化性能

杂多阴离子柱撑锰铝水滑石的合成、表征及催化性能刘继广，孙铁，蒋大振（吉林大学化学系，长春１３００２３）关键词杂多阴离子，柱撑，锰铝水滑石，异丁烷，烷基化类水滑石化合物属于阴离子型粘土‘’‘，其中心金属离子Ｍ２＋或Ｍ３＋及平衡阴离子可根据需要进行改变．...     

有机微波化学研究进展

本文综述了近几年来微波技术在有机合成方面的研究和应用进展。初步探讨了微波催化有机反应的作用机理, 并展望了有机微波化学的发展前景。     

AlPxO催化剂的制备、表征及其在邻苯二酚O-单醚化反应中的催化性能

采用沉淀法制备了AlPxO(x=0,0.33,0.5,1.0,1.5,2.0)催化剂,通过XRD,FTIR,固体核磁共振,BET,NH3-TPD和CO2-TPD等手段对催化剂进行了表征,发现n(P)/n(Al)对催化剂结构及表面酸碱性质有很大影响.考察了AlPxO催化剂上以邻苯二酚和甲醇为原料,采用气相法一步合成愈创木酚的反应性能,并研究了催化剂表面酸碱性质对反应活性和选择性的影响.结果表明,催化剂表面同时存在一定量的弱酸和弱碱中心有利于提高愈创木酚的收率.     

3, 5-二叔丁基邻苯二酚的过氧化降解偶合反应研究

3, 5-二叔丁基邻苯二酚过氧化氢氧化制备3, 5-二叔丁基邻苯醌时, 发现在氢氧化钾溶液中发生了氧化降解偶合反应, 制得了3, 5-二叔丁基-5-(2, 4-二叔丁基-6-羟基苯氧基)-2-呋喃酮 2; 并对其生成作了较合理的解释。     

一类交叉耦合非线性反应扩散方程组的爆破分析

主要研究了具有混合型的多重非线性项的抛物方程组的初边值问题.方程组中的非线性项是幂函数和指数混合型的.这些非线性项组合出了源-流交叉耦合,通过比较原理得到了方程组的上下解,并得到了解有限时刻爆破的临界指标.     

BASIC EQUATIONS, THEORY AND PRINCIPLE OF COMPUTATIONAL STOCK MARKET (Ⅲ)—BASIC THEORIES

ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｐｒｉｃｅｏｆｇｏｏｄｓｖａｒｙｉｎｇａｒｏｕｎｄｉｔｓｖａｌｕｅｉｓｃｏｎｓｉｄｅｒｅｄｔｏｂｅａｂａｓｉｃｒｕｌｅｏｆｇｏｏｄｓ,ｉ.ｅ .,ｔｈｅｌａｗｏｆｖａｌｕｅｏｆｇｏｏｄｓ.Ａｓｔｏｃｋｉｓａｋｉｎｄｏｆｇｏｏｄｓ ,ｉｔｎａｔｕａｌｌｙｏｂｅｙｓｔｈｅｌａｗｏｆｖａｌｕｅｏｆｇｏｏｄｓ.Ｓｏｔｈａｔｔｈｅｐｒｉｃｅｏｆｓｔｏｃｋｖａｒｉｅｓａｒｏｕｎｄｉｔｓｖａｌｕｅ.Ｔｏｄｅｔｅｒｍｉｎｅｔｈｅｖａｌｕｅｏｆｓｔｏｃｋｉｓｖｅｒｙｉｍｐｏｒｔａｎｔｆｏｒｔｈ…     

Generation of Sub-2 Cycle Optical Pulses with a Differentially Pumped Hollow Fiber

We report the generation of optical pulses with an energy of 0. 55 m^3 and duration of 1.6-cycle （4.4 fs） at repetition rate of 1 kHz using a differentially pumped hollow fiber and chirped mirrors. Compared to the statically gasfilled scheme, the differentially pumping hollow fiber is demonstrated to support more energy output with higher transmission efficiency, and to increase the spectral broadening due to a reduction of ionization defocusing in plasma at the fiber entrance. The differentially pumping technique is proved to be an effective way to obtain optical pulses with mono-cycle and higher energy.     

First Principles Study of Adsorption and Reaction of CO on SrTiO3 （100） Surface： the Role of Surface Oxygen Vacancies

The adsorption and reaction of CO on SrTiO3 （100） surface with and without surface oxygen vacancy are investigated by the first-principles calculation based on the density functional theory. The calculated results reveal that the oxygen vacancy site prefers to the activation of the C-O bond. The adsorption energies increase to 1.0855 and 0.3245eV for defect-CO and defect-OC orientations, respectively. Particularly the C-O bond is elongated by about 0.1285 ？ in the defect-OC orientation compared with that in the Ti-OC one without surface oxygen vacancies. There is predominantly a chemisorption mechanism between the CO molecule and the surface in the defect-CO orientation.     

B型和C型Weyl模的一个新重数公式

A monomial basis and a filtration of subalgebras for the universal enveloping algebra U(gl) of a complex simple Lie algebra gl of type Bl and Cl are given, and the decomposition of the Weyl module V (λ) as a U(gl)-module into a direct sum of Weyl modules V (μ)’s as U(gl-1)modules is described. In particular, a new multiplicity formula for the Weyl module V (λ) is obtained in this note.