基于无源性的定子磁场定向感应电机控制器

根据无源性控制的基本思想,并借鉴定子磁场定向控制理论,以定子磁场定向同步坐标系下的定子电流和定子磁通作为系统的状态变量,构建了一种新的电压源型混合控制器,并给出了系统的稳定条件.在理论分析的基础上,证明了在互联与阻尼分配的基于无源性的感应电机控制器设计方法中,将模型表达为欧拉方程的形式是不必要的,且动态解耦条件的数学描述约束过于严格.仿真和实验结果验证了该混合控制器的稳定性、有效性以及良好的静动态性能,同时提出的结论也由此得到了证明.     

基于单个CCⅡ+实现的单输入二输出二阶滤波器

提出一种仅仅用一个电流传器（CCⅡ＋）实现的单输入二输出二阶电流模式滤波器电路。该电路由一个电流传器（CCⅡ＋）、两个电容、三个电阻构成，它能实现二阶低通、带通滤波函数。本文分析了该电路的电流传输函数，并用PSPICE对该电路进行了仿真。仿真结果表明，该电路设计正确，电路结构简单，所用元器件少。     

SD大鼠肝癌癌前病变血清微量元素含量变化分析

目的:用DENA为诱变剂,建立不同时期SD大鼠肝癌动物模型,系统的观察肝癌癌前病变发生发展过程中血清Cu,Zn,Fe,Ca,Mg含量的变化.方法:DENA连续灌胃至11周,分别在14 d、28 d、56 d、77 d采血,原子吸收分光光度法测定血清中Cu,Zn,Fe,Ca,Mg 5种元素含量,用SPSS软件进行统计处理.结果显示:在诱癌第14 d,实验组血清Fe含量显著高于对照组(P<0.05),第28 d差异极显著(P<0.01);而血清Zn含量在第28 d实验组显著低于对照组(P<0.05),其它元素实验组与对照组结果无差异.第56 d和第77 d实验组血清Fe、Zn含量都极显著低于对照组(P<0.01).而56 d之后实验组血清Cu、Ca含量都显著高于对照组(P<0.05).整个诱癌过程中实验组和对照组血清Mg含量结果无差异.结论:从14 d到77 d,与对照组比较,实验组血清Cu,Ca含量逐渐升高,而Zn含量逐渐降低,Fe含量先升高后降低,Mg含量在整个过程中没有明显变化.     

Feature combination for classifying single-trial ECoG during motor imagery of different sessions

The input signals of brain-computer interfaces (BCIs) may be either scalp electroencephalogram (EEG) or electrocorticogram (ECoG) recorded from subdural electrodes. To make BCIs practical, the classifiers for discriminating different brain states must have the ability of session-to-session transfer. This paper proposes an algorithm for classifying single-trial ECoG during motor imagery of different sessions. Three features, derived from two physiological phenomena, movement-related potentials (MRP) and event-related desynchronization (ERD), and extracted by common spatial subspace decomposition (CSSD) and waveform mean, are combined to perform classification tasks. The specific signal processing methods utilized are described in detail. The algorithm was successfully applied to Data Set I of BCI Competition III, and achieved a classification accuracy of 91% on test set.     

Design study for the cascaded HGHG experiment based on the SDUV-FEL

Cascading stages of high-gain harmonic generation(HGHG) free electron laser(FEL) is a promising way to produce fully coherent X-ray radiation.As a test facility for modern FEL R&D,the Shanghai deep ultraviolet FEL(SDUV-FEL) is now under upgrading for the cascading two stages of HGHG experiment.Since the energy of the electron beam is as low as about 185 MeV after upgrade,the total harmonic number of this two stages HGHG is only 2×2,and the wavelength of the final radiation is 196.5 nm which is the 4th harmonic of the 786 nm seed laser.With help of three-dimensional simulation codes,design studies on the FEL physics for the cascaded HGHG experiment are present based on the parameters of the upgraded SDUV-FEL facility.It is found from the simulation results that the part of the electron beam which has been used in the first stage can still generate powerful radiation in the radiator of the second stage,and this radiation will be difficult to be separated from the radiation generated by the fresh part of the electron beam.To overcome this problem,a novel method based on the energy spectrum of the electron beam is proposed in this paper to demonstrate the "fresh bunch" technique.     

一个现代综合银行业务处理系统的设计与实现

介绍了一个现代的综合银行业务处理系统的设计思想和实现技术．该系统采用目前国内外银行系统业务处理先进思想，以ＩＢＭＡＳ／４００计算机为主机，以ＷＩＮＤＯＷＳＮＴ网络为前台工作站，利用目前国内较为流行的计算机软件技术开发完成．整个系统在综合帐务处理、综合客户信息管理和综合柜员制模式下，完成对公、对私、国际业务、金融卡、同业往来、内部核算等银行业务的集中处理；提供柜台业务、电话银行、网点客户终端、企业／家庭银行、ＡＴＭ存取款、ＰＯＳ等服务手段；实现了辖内资金实时清算、异地私人储蓄通存通兑、异地对公资金实时到帐的电子联行     

示波极谱-铁氰化钾滴定法测定药物制剂中VC的质量分数

以K3[Fe(CN)6]与Vc在盐酸介质中的氧化还原反应的基础，用K3[Fe(CN)6]标准溶液滴定VC，以K3[Fe(CN)6]在示波极谱图上切口的出现，用以指示滴定终点。本法简单易行，灵敏准确、终点直观、选择性强，应用于VC片剂中VC的测定以及感冒敏、强力VC银翘片中VC的测定，均获满意结果。     

大众传媒对大学生环保观念的影响调查报告

文章以南京高校为例,论述了调查的背景、目的及方法,指出调查结果对其进行分析,最后总结出经验,并对存在的问题提出一些建议。     

浅析医疗寻租问题

从传统的寻租理论入手，分析医疗寻租成因，从价格双轨制、市场失灵和委托代理三方面，提出我国医疗改革中存在几种问题及其危害性．并提出了对于这些问题的对策和建议。