陶渊明研究中的选择性心理探析

选择性心理是人们面对纷繁复杂信息时普遍的心理现象。在文学研究中,这种现象大量存在,使人看到学术他律的因素有时是很惊人的。本文运用传播学的相关理论,分析论述选择性心理对陶渊明研究的影响,以期窥斑见豹。     

单片机80C51寻址方式的教学方法探讨

为了更好地教授汇编语言程序设计,需要掌握好各种不同的寻址方式。在教学中应突出重点,对于学生易混淆与忽视的地方应加强该部分内容的教学。     

Genetic and environmental influences on reactive and spontaneous locomotor activities in rats

Paired groups of rats (derived from divergent, selective breeding or living in divergent environmental conditions) were compared with regard to locomotor activities. Intrapair differences were found to vary non-systematically, depending upon whether the rats were initially exposed to a test-environment with or without a slight environmental modification (reactive activities), or were allowed to habituate extensively to the environment (spontaneous activity). Since the behavioral patterns were found to represent distinct entities, this pointed to the necessity of differentiating clearly between spontaneous and reactive activities and indicated, once again, that both genetic and environmental influences are important in these behaviors and must be taken into account. Accepting and controlling for these variables makes it possible to use the factor of individual differences in laboratory animal behavior to advantage.     

Genetic and environmental influences on behavioral and neurochemical aspects of emotionality in rats

Summary Three pairings of rats (two derived from divergent, selective breeding and one from divergent environmental conditions) were compared with regard to behavioral and hormonal parameters. Striking differences were observed: results obtained in our own laboratory as well as those found in a review of the literature pointed to higher emotionality (e.g., increased defecation and corticosterone secretion, etc.) in Roman low-avoidance, Wistar-Kyoto and group-housed rats, as compared to their respective counterparts, Roman high-avoidance, spontaneously hypertensive, and individually housed Wistar rats. Concomitant receptor binding studies reviewed here (³H-diazepam- and³H-imipramine-binding sites) have revelaed, however, less consistent intrapair differences.     

含钒SBA-15介孔分子筛的制备及丙烷选择氧化反应

采用“pH-调节法”共合成得到不同钒含量的V-SBA-15催化剂,通过X射线粉末衍射、N2吸附、透射电镜、拉曼光谱、51V魔角旋转核磁共振谱、NHs-程序升温脱附、Hz-程序升温还原等手段对催化剂进行表征,并研究了其丙烷选择氧化反应的催化活性．结果表明,V-SBA-15催化剂保持SBA-15介孔分子筛的两维六方孔道结构,低含量时钒以高分散的孤立态四面体形式存在于分子筛的骨架中,高含量时出现聚集态的氧钒八面体物种．低钒含量的催化剂具有低酸量的弱酸性位和较低温度下的还原性,在丙烷选择氧化脱氢反应中表现出较高的催化活性．     

柴油机尾气选择性催化还原脱硝用蜂窝型催化剂的制备及其发动机台架测试性能

从催化剂粉末配方筛选、涂覆浆液配方及工艺优化等方面,讨论了蜂窝型整体催化剂制备过程的关键影响因素及其性能指标．对所制得的催化剂原粉、整体催化剂切块样品和整体催化剂分别进行了物理化学性能表征、催化性能微反测试以及发动机台架测试．台架测试结果表明,新型蜂窝型整体催化剂的选择性脱除氮氧化物的性能优异,即使使用高硫含量的市售国Ⅲ燃油,经过处理的尾气排放也远远超过国Ⅳ标准,达到国V标准,表明了该催化剂已具备实际推广应用的价值．     

3-溴-1,6-萘啶-5(6H)-酮的合成

报道了以1,1,3,3-四甲氧基丙烷和2-氰基乙酰胺为起始原料,经胺化、溴化、Sonogashira选择偶联、氰基水解等反应合成5-溴-2-(2,2-二甲氧基乙烯基)-烟碱酰胺(8),8经环化反应得到化合物3-溴-1,6-萘啶-5(6 H)-酮(9),共历经8步反应,总产率约为10%.化合物(9)的结构经过1 HNMR、13 C NMR、MS和EA等表征.     

改性活性炭纤维负载锰铈复合氧化物低温选择性催化还原脱硝

采用Ce-MnOx/ACFN对烟气进行低温选择性催化还原脱硝实验,分别考察了活性炭纤维(ACF)改性、Ce-MnOx负载量和Ce/Mn摩尔比以及操作条件对脱硝效率的影响.在70～110℃条件下,Ce-MnOx/ACFN作为选择性催化还原脱硝的催化剂具有良好的活性,其脱硝效率随烟气温度升高而升高.催化剂载体活性炭纤维经硝酸改性后脱硝效率有明显提高.随着Ce-MnOx负载量增加和Ce/Mn摩尔比增加,脱硝效率先升高后降低.随着入口烟气NH3/NO摩尔比增加,脱硝效率先升高后趋于稳定.当入口烟气中水蒸气体积分数大于8%时,脱硝效率随其增加而降低.     

基于1-丁基-3-甲基咪唑十二烷基硫酸盐为活性物质的PVC膜电极的性能及其应用

以离子液体1-丁基-3-甲基咪唑六氟磷酸盐（BmimPF6）为活性物质制得离子选择性电极,该电极对离子液体BmimCl有较好的电位响应,线性响应浓度范围为1×10^-5mol/L～1×10^-2mol/L.用十二烷基硫酸钠（SDS）与BmimPF6进行阴离子交换制得的1-丁基-3-甲基咪唑十二烷基硫酸盐（BmimDS）作为活性物质,能降低电极的检测下限,线性响应浓度范围拓展为1×10^-6～1×10^-2mol/L.该电极显示出良好的稳定性和重现性.此外,该电极可作为电位滴定法的指示电极用于对四丁基氯化铵（TBACl）、十二烷基硫酸钠（SDS）的滴定分析.     

一种新的多电平逆变器特定谐波消除脉宽调制方法

基于多电平逆变器特定谐波消除脉宽调制(SHEPWM)方法的波形对称方案,提出了一种新的多电平逆变器半周期对称波形SHEPWM方法,可以求取许多现有方法不能求得的数值解,具有通用性强、形式简单、波形灵活、易于编程、解的空间大等优点.以五电平逆变器为例,取半个周期内20个开关切换点,对调制比为0.8时的非线性方程组进行求解,求取了12组数值解,抽取其中2组进行仿真和实验研究,证明了所提SHEPWM方法的有效性和实用性.