宏应用遇到的问题及解决办法

本文指出了在Microsoft Word2002/2003中用宏录制器录制宏遇到的几个问题,并给出相应的解决办法。其中对宏无法实现将中文设置为指定的目标中文字体,用录制前将光标定位在指定字体的文本中及录制后修改代码的方法解决。     

均三甲苯氧化合成间二甲基苯甲酸的宏观动力学

研究了由均三甲苯液相富氧催化氧化制备间二甲基苯甲酸的动力学规律 ,考察了反应时间、温度、通气量和氧浓度等因素对均三甲苯和间二甲基苯甲酸浓度的影响 ,根据双膜理论建立了该反应的宏观动力学模型 ,并由实验数据拟合出模型参数 ,经检验模型计算值能较好地与实验数据相吻合     

The significance of defect chemistry for the rate of gas–solid reactions: three examples

Three examples are revisited in which the reaction rate could be reliably correlated with point defect chemistry highlighting the role of point defects as acid–base active centers. In the case of dehydrohalogenation of tertiary butyl chloride, AgCl becomes increasingly active as heterogeneous catalyst, if AgCl is homogeneously or heterogeneously doped. By such a procedure the silver vacancy concentration is adequately increased. The oxygen incorporation into SrTiO₃ offers an example in which the surface mechanism in terms of adsorbed species, oxygen vacancies and electronic centers has been elucidated. Appropriate surface coatings give rise to significant catalytic effects. Increasing iron (acceptor) doping not only changes the point defect chemistry but also the nature of the rate determining step. Lastly, the electrocatalytic function of Sr-doped LaMnO₃ is considered as regards oxygen reduction reaction and O²⁻ incorporation into Y-doped ZrO₂ in the context of solid oxide fuel cells. Again the defect chemistry is of prime importance for the reaction rate.     

影响徐州房地产价格因素的调查与分析

房价是消费者、房地产开发商和政府共同关注的焦点.影响房价的因素众多,其中宏观影响因素对房价走势起到主导作用.以徐州市房地产市场为背景,调查和分析各影响因素对徐州市房价的影响.结果表明,徐州市房价的变动除了有成本因素之外,需求拉动及政府宏观调控政策是最直接的原因.     

高维度满速率的宏分集空时编码方案

为了适应宏分集传输中高天线数的要求,提出一种高维度满速率的空时编码方案. 这种高维度编码可以达到满速率传输,且其最大似然译码复杂度可控,只需对(发射天线数/2)个实数符号联合最大似然译码. 对该编码的等效信道相关矩阵进行分析后得出结论：等效信道右奇异矩阵为常数矩阵. 提出一种具有单符号线性译码复杂度的无反馈要求的预处理传输机制,使译码复杂度大大降低. 仿真结果表明,相比于最小译码复杂度编码以及其他宏分集传输方案,如循环延迟分集,高维度满速率编码方案的性能有一定提升.     

五自由度宏/微双重驱动并联机构及其运动学分析

提出了一种扫描电子显微镜用4-PSPS/PRPUR五自由度宏/微双重驱动并联机构,该机构可以实现三维移动和两维转动。采用螺旋理论分析了该机构的自由度,采用基于螺旋系线性相关性的并联机构输入选取判别方法,选取了驱动副并进行了合理性判别。在此基础上对该双重驱动并联机构进行了位置反解分析,结合其应用给出了数值算例,并进一步对该机构进行了速度、加速度分析,且给出了速度、加速度的数值算例。     

基于S曲线模型的航空装备嵌入式软件量化安全评估

软件测试是航空装备嵌入式软件生命周期中的重要环节,如何评估软件测试的效果是一个难题。以软件测试为基础,讨论了航空装备嵌入式软件的生命周期过程中安全缺陷出现的规律,认为它的安全缺陷同样满足S曲线。引入了AML建模理论,基于软件测试数据,建立了某航空嵌入式软件的S曲线模型,预测了软件的总安全缺陷数。对AML理论进行了拓展,讨论了转折点的选取原则。最后,通过卡方检验和预测检验的方法,验证了预测模型与测试数据的匹配性。检验结果表明,AML模型能够很好地模拟实际测试情况,一定程度上消除了数据随机性的影响,其模型具有一定可信度,能够用于航空装备嵌入式软件的安全性分析。     

Proton irradiation damage mechanism of the InAlAs／InGaAs／InAlAs quantum well

InP-based high electron mobility transistors (HEMT) have shown a great potential for national defense and satellite radar in space radiation environment applications. This paper studies the proton radiation damage mechanism of its critical structure InAlAs／InGaAs／InAlAs quantum well. The proton projection range and vacancy defect information are obtained at different incident proton energies of 50keV, 75keV and 200keV by SRIM software. With the increase of proton energy, the proton injection depth is increasing and eventually protons pass through the material layers. Besides, the proton radiation induced vacancy defects numbers around hetero-junction increase first and decrease subsequently, and As vacancies are the main proton radiation induced defects. In addition, non-ionizing energy loss (NIEL) of In_0.52Al_0.48As and In_0.53Ga_0.47As material is computed under different incident proton energies by the analytical model. The change trend of NIEL is identical to the induced vacancy numbers, namely, NIEL first increases and then decreases as the incident proton energy increases. Finally the degrading effect of the radiation-induced As defect is detected in the two-dimensional electron gas in the quantum well, which confirms that the major proton radiation damage mechanism of the quantum well is the induced vacancy defects by NIEL.     

基于多因素改进型PSOSVM算法的中长期负荷预测

中长期负荷预测作为电力规划与调度中的重要一环,其影响因素有着多样性和不确定性等特点.选取支持向量机作为中长期负荷预测的核心算法,筛选多种区域宏观经济因素,利用粒子群(PSO)寻优与循环寻优的改进型算法对支持向量机(SVM)的参数进行优化及负荷预测.仿真结果显示,改进型PSOSVM算法有着较高的预测精度.     

硅藻土对上海潮土和黄泥土耕作性能改良的试验研究

采用硅藻土对上海两种农业土进行改良试验研究,分析了不同硅藻土体积比对上海潮土和黄泥土稠度指标、水稳定性大团聚体含量和击实性能的影响。试验表明:塑、液限值与硅藻土含量相关系数为0.981*、0.971*,并且硅藻土对塑、液限的影响与土的粘性聚合体含量成反比;硅藻土可以明显增加两种土中粒径大于0.25 mm的大团聚体的含量;硅藻土可以显著提高两种土的最优含水率并降低最大干密度,且相关性系数分别为0.993*、-0.999**。由此说明,硅藻土可以提高上海农业土的疏松度和保水性能。