土壤固化剂在水利工程中的应用试验

为了准确掌握固化剂在水利工程中的应用范围，特别是能否在北方季节性冻土地区应用于渠道衬砌，针对应用固化剂固结土进行研究试验．根据固化剂特点，选择宁夏唐徕渠、汉延渠的渠床土及征沙渠风积沙、镇北堡粗沙，进行强度试验．实践证明：在固化剂含量一定(20．42％)的情况下，影响固结强度的主要因素是含水率．最优固结含水率为16．5％．得出结论：土壤固化剂作为一种新型建筑材料，应用于强度要求较低的工程建设中，技术是可行的，其固化沙石的效果较黏土、沙性土的效果显．     

藏红T与DNA相互作用的电化学及紫外-可见光谱研究

利用循环伏安法研究了藏红T(ST)在玻碳电极上的电化学反应,结合紫外-可见光谱(UV／Vis)对藏红T与DNA的作用机理进行了研究,并通过测定藏红T对溴化乙锭-天然DNA体系的影响,以及天然DNA和变性DNA与藏红T作用的不同,得出藏红T与DNA发生类似溴化乙锭的嵌插作用的结论,形成了2ST-DNA结合物,结合常数为3.46×104L2·mol-2。     

高压输电线路铁塔选型漫谈

本文结合近几年来,我国高压输电线路铁塔选型方面的基本情况,和作者本人从事高压输电线路铁塔结构设计中的一些经验和看法,简述了大负荷、新结构的塔型使用现状和铁塔选型应注意的一些问题。     

Preparation of Perovskite-Type Oxides La1-x Srx Fe1-y Coy O3 Using EDTA Sol-Gel Method

Two series of perovskite-type oxides with composition La1-xSrxFeO3 (x≤0.8)and La1-xSrxFe1-yCoyO3( x = 0.2；y = 0.2, 0.4 ) powder productions were synthesized by EDTA complexing sol-gel method. The products were characterized by XRD, TEM, SEM, BET method (N2 adsorption)and laser granularity analysis for different synthesis conditions to obtain the optimum conditions for the preparation process. Single-phased, uniform perovskite-type oxides with small particle size were obtained by EDTA sol-gel process with high stability and repeatability,and the process temperature is much lower than that of solid state reaction method.     

Physical and Electrochemical Properties of Doped LiFePO4 as Cathode Material for Lithium-Ion Batteries

LiFePO4 cathode material was synthesized by a solid-state reaction using doping several elements (Nb5 ,Zr4 ). The starting materials were mixed with a high-efficient sander and treated thermally under flowing N2. The samples were characterized by X-ray diffraction (XRD), field-emission gun electron microscopy (FEG), and their electrochemical performance was investigated in the term of cycling behavior. Room temperature discharge capacity about 140.6 mA·h·g-1 was obtained at C/5 rate.     

Defects tracking matrix for mass customization production based on house of quality

The vision of mass customization has driven a movement toward low volume, high variety mass customization production (MCP) at low price. However, defect identification and defect tracking in such systems are extremely difficult because of the frequent reconfiguration needed by the number of different part types and the interruption of the information flow about quality with each reconfiguration of the system. It is important to quickly rebuild quality information flow with MCP system’s reconfiguration synchronously. This paper introduces a defect tracking method based on Quality Function Deployment for every MCP system module. A defects tracking matrix (DTM) based on the House of Quality directly connects manufacturing technologies with quality defects inside a MCP module. Each MCP reconfiguration requires the DTMs’ rearrangement and DTM-chain is proposed. A dynamic reconstructing algorithm synchronizes the DTM-chain with each MCP reconfiguration. A case study demonstrates the usefulness of the DTM and DTM-chain.

证明推广的卡诺定理的另一种方法

本文提出了对于推广的卡诺定理的另一种较严密的证明方法,此种证明方法更易于为学生接受,其物理含义更为明确。     

神经元网络——它的背景、进展和问题

近年来神经元网络研究的进展,在国际学术界引起了强烈的轰动,成了各界学人的热门话题.本文分析了神经元网络研究的来龙去脉,简要介绍了若干代表性的进展,指出了这一研究的意义、问题和进一步研究的方向,希望引起各界同仁的关注.     

高压三电平变频器的滤波升压系统中能量过渡过程研究

从不同时间尺度上对高压三电平变频器的滤波升压系统进行数学建模，在秒级的时间尺度上主要研究该负载在不同负载稳态运行时的滤波情况，在毫秒级的时间尺度上主要研究故障时从变频切到工频时的电机过渡过程，从微秒级的尺度上研究了负载切换时缓冲吸收电路的能量过渡过程。同时由于变频器向该系统注入了大量的高频分量，为此建立了变压器高频分布模型，以评估变压器分布电容对全系统的影响。实验结果表明了模型和分析方法的有效性。     

浅议汉语量词的英译

阐述了汉语量词的英译选择艺术。