CuO—ZnO／PF催化剂合成碳酸二甲酯的研究

介孔碳作为一类新型的非硅基介孔材料,在催化剂栽4#-应用方面具有广阔的前景．采用溶胶一凝胶法制备了CuO—zno／PF系列负载型催化刑,并应用于甲醇和二氧化碳直接合成碳酸二甲酯（DMc）．研究结果表明：以铜锌氧化物物质的量之比为2：1,650℃煅烧的催化剂在温度为320．5℃左右,压力为3．oMPa时催化性能最好,甲醇的转化率达87．78％,碳酸二甲酯的选择性达80．46％．     

基于社会资本理论的技术创新网络有效治理研究

在生产要素自由流动的网络经济环境下,传统的治理理论已难以适用于具有开放结构的技术创新网络。社会资本理论为此项研究提供了新的方向,但是现有相关研究主要集中于对技术创新网络结构(强弱连接)的分析,并没有深入到对技术创新网络关系治理的研究。在此基础上,分析了不同结构下的技术创新网络关系治理方式,研究表明:有核技术创新网络主要以强连接为主,应当利用核心企业对网络进行权威型治理;无核技术创新网络主要以弱连接为主,应当利用网络成员间的信任对网络进行联合型治理。     

英语中隐性否定的类型划分

正确理解及掌握英语中的隐性否定,是大学英语专业学生需要掌握的内容.从常见的英语隐性否定句入手,探讨了英语中隐性否定的类型划分,对英语学习者提高阅读能力和翻译水平具有一定的实用价值.     

Study on the extending multi-attribute decision model of grey target

Based on the distance of interval numbers and the two-stage decision methods, this paper expands the decision model of grey target into some situation under which the decision information and target weights are the interval numbers at the same time. It also gives the optimization method of weights in the grey target. We get the optimum coordinated vector utilizing the combination assigning method, based on the local optimization of various schemes. So it can shift the weights of interval number into real number form and sequence it according to the weighted off-target distance. Finally the effectiveness and practicality of the model is proved by a real project.     

有关最低工资标准确定若干问题的系统思考

最低工资制度是社会保障制度的重要组成部分。论文在对国内外有关最低工资制度的研究现状进行综述的基础之上,归纳出最低工资制度与标准的发展脉络及趋势,进而指出研究最低工资标准的基本思路与主要内容,最后提出了确定最低工资标准的建议。     

Feedforward Control of a 3-D Physiological Articulatory Model for Vowel Production

A three-dimensional (3-D) physiological articulatory model was developed to account for the biomechanical properties of the speech organs in speech production. Control of the model to investigate the mechanism of speech production requires an efficient control module to estimate muscle activation patterns, which is used to manipulate the 3-D physiological articulatory model, according to the desired articulatory posture. For this purpose, a feedforward control strategy was developed by mapping the articulatory target to the corresponding muscle activation pattern via the intrinsic representation of vowel articulation. In this process, the articulatory postures are first mapped to the corresponding intrinsic representations; then, the articulatory postures are clustered in the intrinsic representations space and a nonlinear function is approximated for each cluster to map the intrinsic representation of vowel articulation to the muscle activation pattern by using general regression neural networks (GRNN). The results show that the feedforward control module is able to manipulate the 3-D physiological articulatory model for vowel production with high accuracy both acoustically and articulatorily.     

广西保护区淡水鱼类的联系及分布

记录了广西木伦等6个保护区的鱼类72种,并应用弦距离系数比较了6保护区内水系的联系程度。6保护区的鱼类区系以老第三纪原始类群后裔种类为主,此外,还有东亚特有江河平原鱼类,南亚暖水性类群鱼类。云跺高原东部种类也有分布,除木伦保护区鱼类属东洋区南亚亚区的云贵高原鱼类外,其余的保护区属南东亚亚区华南小区。     

High-temperature ultrafast polariton parametric amplification in semiconductor microcavities.

Cavity polaritons, the elementary optical excitations of semiconductor microcavities, may be understood as a superposition of excitons and cavity photons. Owing to their composite nature, these bosonic particles have a distinct optical response, at the same time very fast and highly nonlinear. Very efficient light amplification due to polariton-polariton parametric scattering has recently been reported in semiconductor microcavities at liquid-helium temperatures. Here we demonstrate polariton parametric amplification up to 120 K in GaAlAs-based microcavities and up to 220 K in CdTe-based microcavities. We show that the cut-off temperature for the amplification is ultimately determined by the binding energy of the exciton. A 5-micrometer-thick planar microcavity can amplify a weak light pulse more than 5,000 times. The effective gain coefficient of an equivalent homogeneous medium would be 107 cm-1. The subpicosecond duration and high efficiency of the amplification could be exploited for high-repetition all-optical microscopic switches and amplifiers. 105 polaritons occupy the same quantum state during the amplification, realizing a dynamical condensate of strongly interacting bosons which can be studied at high temperature.     

含叠氮硝胺的低特征信号推进剂的热分解研究

应用高压ＤＳＣ（差示扫描量热法）、ＴＧ（热重法）和ＤＴＧ（差示热重法）了ＤＡＴＨ（１,７－二叠氮－２,４,６－三硝基氮杂庚烷）、ＲＤＸ（黑索金）单组分以脑ＲＤＸ－ＣＭＤＢ（复合改性双基推进剂）和ＣＤＡＴＨ－ＲＤＸ－ＣＭＤＢ推进剂样品的热分解,温度达２００℃时,首先暗ＤＡＴＨ中３个－ＮＯ２从主链上断裂分解,接着是一Ｎ３和其他残余分子在较短的时间剧烈地分解并释放出大量的热,在多组分体系中,ＤＡＴＨ与（     

基于Volterra基函数网络的自适应逆控制方法

提出了一种基于Ｖｏｌｔｅｒｒａ基函数（ＶＰＢＦ）网络的非线性系统自适应逆控制方法。对象和逆控制器各用一个ＶＰＢＦ网络表示,应用正交最小二乘算法进行离线网络结构确定和权值初始化,构造了一种动态归一化非线性最小均方（ＤＮＮＬＭＳ）权值更新算法,以进行网络权值的在线学习。仿真结果表明,该方法具有算法简单、学习速度快、鲁棒性能好等优点。