运用螺旋理论推断秋水仙碱的构型

秋水仙碱是医治癌症的重要药物 ,其结构中不仅存在手性碳原子的构型问题 ,也存在类似于联苯衍生物的构型和构象问题 .确定了手性碳原子的构型 ,还必须确定两个芳环间的构型和构象 .运用笔者提出的螺旋理论 ,通过其旋光方向和旋光度可以方便地确定秋水仙碱两个芳环间的构型和构象 .     

有机不对称合成反应的热力学研究

本文首次建立了不对称合成反应中热力学函数之间的相互关系，阐明了不对称合成手性产率随构型熵和温度变化的规律，在不对称合成中具有重要的理论和实际意义．     

整株林木垂向抗拉试验研究

在土壤地形条件相同的情况下,对整株树木进行垂直拉拔试验,结果表明,树木的根系分布形态直接影响根系的垂直抗拉效果.杜鹃水平根系发达,拉拔过程中根系整体被拉出,而冬瓜杨由于垂直根系较发达,拉拔过程持续时间较长,冷杉具有垂直和侧向主根,荷载-位移(P-S)曲线表现出多峰的特征.     

古今字与通假字之辨析

通过分析比较古今字与通假字产生的原因、途径和形体特点,文章得出结论:古今字的古字与今字一般含有共同构件;通假字的本字与借字一般不含共同构件.     

基于网络的聋人高等教育模式探讨

文章论述了网络教学对聋人教育的影响 ,从信息化对传统聋人教育模式的影响、聋人网络教学的优势与特征、聋人网络教学的现有模式、聋人网络教学的主要形式概述 ,现行网络教学模式的分析与比较等方面进行了论述 ,提出了基于网络的聋人高等教育的模式是结构强化的发展认识模式 ,介绍了此种模式的应用。     

Truth and Form

In this article I discuss some problems concerning the truth value of narratives; more specifically as this problematic is played out in empirical, narrative research. My point of departure is Jane O’Dea’s critique of Denis Phillips’ views of the topic. While Phillips thinks that truth (in the correspondence sense) definitely should be a concern for narrative researchers, O’Dea claims that Phillips mistakes what kind of research narrative is, and that the notion of truth he advocates therefore is inappropriate. I argue that neither of them takes into account the particular beginning-middle-ending form of narratives, which if anything makes the truth issue more complicated, but certainly not less important.     

英语认同型关系小句中价值/标示结构分析

价值/标示语法结构是英语认同型关系小句的描述方式之一。在M.A.K.Halli-day系统功能语法的框架下,对价值/标示这一结构加以分析,可以明确其具体的含义及确定方式。同时,通过用价值/标示结构对一英文语篇进行语篇分析,可以展示出语篇分析的一个新的维度,从而进一步证明系统功能语法在语篇分析中的可操作性。     

晶体管H参数微变等效电路研究

分析晶体三极管三种组态电路H混合参数，用不同方法导出共集、共基放大电路H参数和更精确的共集电极及共基电极晶体三极管H参数与其共发射极组态H参数的关系，说明不同组态电路有相同的电路形式。     

CCPA: Component-based communication protocol architecture for embedded systems

For increased and various communication requirements of modem applications on embedded systems, general purpose protocol stacks and protocol models are not efficient because they are fixed to execute in the static mode. We present the Component-Based Communication Protocol Architecture (CCPA) to make communication dynamic and configurable. It can develop, test and store the customized components for flexible reuse. The protocols are implemented by component assembly and support by configurable environments. This leads to smaller memory, more flexibility, more reconfiguration ability, better concurrency, and multiple data channel support.     

Studying on the increasing temperature in IT-SOFC： Effect of heat sources

The dimensions and the materials type limit the performance of fuel cell. The increase of the temperature in electrodes and electrolyte of the cell,is due to the over potential of activation (transfer of load),the over potential Ohmic (resistance of polarization),the over potential of reaction (heat released by the chemical reaction) and the over potential of diffusion. In this paper,we studied the thermo-electrical performance of an intermediate temperature solid oxide fuel cell (IT-SOFC) with electrode supported. The aim of this work is to study this increasing temperature of a single cell of an IT-SOFC under the influence of the following parameters: heat sources,functioning temperature and voltages of the cell,geometric configuration and materials type. The equation of energy in one dimension is numerically resolved by using the method of finite volumes. A computing program (FORTRAN) is developed locally for this purpose in order to obtain fields of temperature in every element of the cell.