有机小分子催化合成高聚物的研究进展

综述了有机小分子催化剂在高分子合成上应用的研究进展,着重分析催化剂结构与催化效能、单体的选择性以及聚合物的性质之间的关系。     

碳酸二苯酯与1,4-丁二醇酯交换反应馏分的气相色谱分析

采用毛细管气相色谱法对碳酸二苯酯(DPC)与1,4-丁二醇(BD)酯交换反应生成的馏分进行了分析。Equity~(TM)-1非极性柱为分析柱,FID为检测器。结果表明,本法具有良好的线性关系;DPC、BD和苯酚的检出限分别为4.08×10~(-4)、4.30×10~(-3)、2.31×10~(-4)g/L;回收率范围在95.0%—103.3%之间;相对标准偏差均小于5.0%。     

湖南省城镇居民消费的实证分析

本文利用递归的核回归模型 ,分析湖南省城镇居民消费性支出 ,以提高拟合度 ,减少预测误差     

高等数学课程建设探索与实践

本探索了高等数学课程应适应当今教育要求，达到培养学生数学素质和能力的建设思路，总结了高等数学课程建设在师资队伍建设，教学方法、手段改革，高等数学双语教学及开展第二课堂等方面所取得的成果。     

Frequencies-Selected Enhancement of the Extended High-Order Harmonic Generation Plateau from a United Two-Atom System Irradiated by a Combined Pulse

We present a high-order harmonic generation (HHG) spectrum from a united two-atom system exposed to a combined laser pulse, by numerically solving a one-dimensional time-dependent Schr6dinger equation. The combined laser pulse is composed of a low-frequency femtosecond pulse and a high-frequency attosecond one with respective appropriate amplitudes. For a suitable inter-nuclear separation, the harmonic emission efficiencies near the second cutoff of the extended plateau can be effectively enhanced by more than four orders of magnitude compared with the case of the low-frequency pulse alone. Such a combined pulse irradiating on the united twoatom system ionizes each atom, in a large rate (but not to a too large ionization yield), mainly at a particular time-interval. When the ionized electron from an atom reaches at the vicinity of the other atom and recombines with it, significant HHG enhancement is achieved for particular harmonics. This result, to our knowledge, is one of the best up to now in the endeavor for dramatically extending the width and simultaneously enhancing the height of the plateau.     

关于双下标序列和渐近正态收敛速度的描述

设ε_j-∞≤j≤∞为一串 i.i.d.r.v.序列,{a_(nj)}为双下标常数列,S_n=(?)α_(nj)ε_j,A_n~2=(?) α_(nj)~2。本文研究了 (S_n)/(A_n) 渐近正态收敛速度的各种描述,其中包括非一致 Berry-Essen 界,L_p(1≤p≤∞)下界等。     

8098单片机在物理实验仪器中的应用介绍

介绍采用８０９８单片机设计智能化物理实验仪器的方法，对被测物理量进行数据采集和处理，结果由显示器数字显示和打印机打印输出．     

液体扩散时的折射率分布和扩散系数的测定

本实验提供一种测量透明度或半透明度液体的折射率和扩散系数的方法。此方法可用于食品工业、日用化学工业、石油工业及制药工业部门。