汽车起重机多轴转向机构的运行学分析

介绍了多刚体系统运动学的基本理论。阐述了链元法运动学分析的基本思想,并运用多刚体系统运动学理论和链元分析法对LT1080汽车起重机的4轴转向系统进行了运动学分析。     

转子径向摩擦故障诊断技术的研究

结合二维全息谱技术进一步分析了径向摩擦故障对转子振动的影响,给出了新的诊断转子径向摩擦故障的典型诊断信息,解决了正确区分径向摩擦故障和其它转子故障的问题,使转子径向摩擦故障极易识别.实验结果和理论分析能很好的吻合,实际应用效果良好.     

最小作用量原理及其意义

本文评述了最小作用量原理的历史发展,指出了它在现代物理学、现代宇宙学中的重要地位,探讨了作用量概念的物理意义以及最小作用量原理的哲学意义.     

开边界条件下自旋1/2 HeisenbergXXZ模型的潜藏定域规范不变性

本文讨论了开边界条件下自旋1/2 Heisenberg XXZ 模型的潜藏定域规范不变性.结果表明,尽管模型Hamiltonian 量及其本征矢明显规范相关,但其能量本征值和Bethe 方程却是规范不变的.     

BO分子电子亲合势的理论计算

采用组态相互作用方法,从理论上计算了BO及BO~-分子基电子态的能量。从而,首次计算出了BO分子电子亲合势的理论值为2.97eV。     

应用灰色系统原理进行长期电力需求预测

本文从理论上分析了灰色系统预测ＧＭ（１，１）模型的适用条件。针对电力系统中电力需求增长的特点，提出了分段最优ＧＭ（１，１）模型，利用电力需求的增长与国民经济增长的相关关系，把分段最优ＧＮ（１，１）模型应用于长期电力需求预测，并用实例证明了此方法的可行性。     

我国有色金属出口额的组合预测模型

有色金属产品是我国出口商品结构中的一个重要组成部分,在竞争激烈的国际市场上,中国有色金属产品的出口前景如何,需要我们用科学的方法加以预测。本文以一个典型产品(锑品)和一个典型市场(美国市场)为例,分别用二元线性回归模型和时间序列分析,对今后八年我国有色金属产品出口额进行了预测,并在这两种预测方法的基础上,推出了一种预测误差更小的组合预测模型。本文还对组合预测模型中权重的确定和预测误差的无偏性进行了证明。     

弱酸性KCl溶液中Zn_2_在铜电极上沉积机理的探讨

本文通过线性电位扫描、循环伏安、交流阻抗等实验方法对弱酸性氯化钾溶液中Zn~2+在铜电极上的沉积行为进行了研究,得到了动力学参数Tafel斜率bc=111mV,反应级数Z=0.95.由此认为Zn~2+在铜电极上的沉积机理是由两个连续的单电子步骤所组成,且反应的第一步是速度控制步骤.反应过程中生成吸附态的一价锌离子(Zn~+ads)中间体.     

Complete Nucleotide Strain Sequence of a Newly Avirulent Newcastle Disease Virus Hubei 92（HB92） Strain

A new avirulent, heat-resistance HB92 strain of newcastle Disease Virus (NDV) was acquired from Australia V4 strain. Its complete nucleotides sequence was first determined. The entire genome of NDV HB92 consists of 15 186 nucleotides (GenBank accession no. AY225110). It was demonstrated by sequence analysis that nucleotides homology of HB92 strain with virulent strain ZJ1 were 83.9%, and the homology compared with avirulent vaccine strain La Sota and B1 were 94. 0% and 93. 5%, respectively. These results might be contributive to the study of the molecular mechanism of evolution of the NDV strain HB92 and to develop the engineered recombinant vaccine.     

Human factors analysis in software engineering

The general human factors analysis analyzes human functions, effects and influence in a system. But in a narrow sense, it analyzes human influence upon the reliability of a system, it includes traditional human reliability analysis,human error analysis, man-machine interface analysis, human character analysis, and others. A software development project in software engineering is successful or not to be completely determined by human factors. In this paper, we discuss the human factors intensions, declare the importance of human factors analysis for software engineering by listed some instances. At last, we probe preliminarily into the mentality that a practitioner in software engineering should possess.