精确到二级近似下的量子隧穿概率

利用WKB法将量子隧穿计算到二级近似,给出了二级近似下粒子隧穿势垒的概率.     

固定床活性炭吸附元素态汞的试验研究

燃煤烟气中汞排放引起的污染越来越受到人们的关注，主要的原因则是其中的元素态汞（Hg^0）由于其低熔点、高平衡蒸汽压以及低水溶性而难以在传统的烟气净化装置中去除．本试验采用固定床活性炭（AC）吸附元素态汞，结果表明，活性炭对汞的吸附取决于活性炭的量、活性炭颗粒大小、汞初始浓度、反应温度以及氯化物浸泡等因素的影响．     

变色酸2R-β-环糊精体系共振光散射光谱法测定农药氰戊菊酯

在pH2．87的B-R缓冲溶液中，氰戊菊酯与变色酸2R反应，在423nm波长处产生稍有增强而稳定的共振散射信号，而β-环糊精的加入进一步明显敏化该共振光散射信号，且散射强度与氰戊菊酯的质量浓度在0．02～0．50mg·L^-1范围内呈线性关系，其检出限（S／N=3）为0．016mg·L^-1。该方法用于地面水、果品及蔬菜等样品中氰戊菊酯的测定，测得回收率在86．0％～113．0％之间，测得结果的相对标准偏差（n=5）在1．6％～6．0％之间。     

On Piterbarg theorem for maxima of stationary Gaussian sequences

Limit distributions of maxima of dependent Gaussian sequence are different according to the convergence rate of their correlations. For three different conditions on convergence rate of the correlations, in this paper, we establish the Piterbarg theorem for maxima of stationary Gaussian sequences.     

Efficient racemization of 1-phenylethylamine and its derivatives

We report on simple and efficient procedure for the racemization of 1-phenylethylamine and its derivatives. In the presence of trichloroisocyanuric acid, N-chloroimine derivative is formed as the intermediates, with subsequent hydrogenation catalyzed by Pd-C leading to the racemic product.     

MULTIPLE POSITIVE SOLUTIONS TO p-LAPLACIAN DYNAMIC EQUATION ON TIME SCALES

In this paper, we study the boundary value problem for some p-Laplacian dynamic equations. By using Guo-Krasnosel'Skii Fixed Point Theorem and Avery-Henderson Fixed Point Theorem, conditions for the existence of positive solutions are obtained.