对近20年“中国英语”争论的反思——兼谈中国英语教学改革

客观派认为“中国英语”是客观存在,对立派认为“中国英语”的存在缺乏政治、社会和理论基础。由于对“中国英语”的定性缺乏同一性,使双方往往是在不同的前提下进行争论,对“中国英语”的采集也不是在同一个准则下进行。应从“语言使用”和“语言使用者”两个侧面对“中国英语”进行定性;应把国际通用英语与地域英语区别开来;应该明确在国际交往中英语言文化不是国际通用文化。     

家兔胚胎细胞核移植与连续移植

将发育不同时期的兔胚和移核胚的卵裂球细胞核与去核的成熟卵母细胞共同组成移核胚,通过中间受体培养和移植实验检验胚胎的发育能力。结果表明,（１）兔囊胚之前各个时期的胚胎细胞核均可使移核胚发育到囊胚;（２）胚胎极化前后的卵裂球参与组成的移核胚发育到囊胚的比例无显著差异。但极化后 ６４细胞胚的卵裂球与去核卵母细胞的融合率低于极化前的 ８细胞胚胎卵裂球;（３）兔 １６细胞胚与去核的卵母细胞组成的移核胚可以发育到期,产仔率为 ３．１６％ ;（４）兔移核胚卵裂球用于连续核移植,其后 ２ 代均可发育成囊胚,其中第 １ 代移核胚与第 ２ 代移核胚发育率相似,但显著高于第 ３ 代移核胚;（５）兔移核胚和各代连续移核胚卵裂球与去核卵的融合率无显著差异。     

基因表达系列分析技术及其在植物抗病性研究中的应用

基因表达系列分析(SAGE)技术不仅能够全面地分析特定组织或细胞内表达的基因，还可以比较不同组织在不同时间、空间条件下基因表达的差异，从而发现新基因。SAGE技术在植物抗病性研究中的应用近几年发展很快。综述介绍了SAGE技术的原理、特点、实验方案、技术发展与演变。     

IEC 61850通讯规约在农村变电站自动化系统中的应用

农网变电站自动化是整个电网自动化中非常关键的一环。IEC61850是变电站自动化系统通讯的国际标准，它代表了变电站自动化未来的发展方向。通过详细分析IEC61850标准的网络分层、面向对象的数据对象统一建模、数据自描述和抽象通信服务映射等主要技术特点，给出了农网变电站自动化中IEC61850标准实现的思路和方法。讨论了建模的方法及对IED的具体数字建模。     

Serial Communication System Between PC and PLC Based on Visual C++

It is usually need to supervise and control gathering data and working status of PLC in industry control.There are some ways such as VB,DELPHI,PB to carry out the requirement.Visual C++ is an exploiture tool for Windows application program and has quite strong function in the aspect of image processing and database managing etc.It has faster speed to realize bottom communication control.Using Visual C++ and MFC,the authors implement the serial communication system between PC and PLC.The paper introduces the communication protocol and software design method and realizes data's sending and incepted rapidly,real-time auto-control accurately and quickly.This system is simple,economical,and reliable and has an application value,which has been applied successfully in real system.     

Circuit Design of Piezoelectric Biosensor Based on CPLD

A kind of sampling circuits of piezoelectric biosensor is designed based on the CPLD devices. It is realized that 10 MHz high frequency signal measure and sampling, data display and data serial communication etc. The system has been proved to have high reliability, good real-time performance. The system architecture are discussed in detail including hardware and software, and the implementation. The simulation result of CPLD kernel and the frequency curve by sample soft are shown.     

Low Voltage Power Line Communication Based on MSK

For that the characteristics of low voltage power line channel are complicated and variable, how to use low voltage power line to realize reliable and high speed communication has always been the hottest question in power line communication field. This article introduces how to apply MSK to the low voltage power line communication. It analyses the application elements of MSK and structures the model of low voltage power line communication based on MSK. simulation result indicates that MSK modulation technology can satisfy the characteristics that the bandwidth of power line communication channel is narrow and the attenuation to the amplitude of signal is time variable and frequency selected. Also, it makes better use of the spectrum.     

A NEW COMPUTER DATA ACQUISITION AND COMMUNICATION SYSTEM FOR ENVIRONMENT PROTECTION FIELD

A new computer data acquisition and communication system is proposed in this paper. The system has the following charatcrjstics: the master station has the double functions of monitoring and controllng the slave stations. The system has low bit erro rrate of data communication, high catch rate of data acquisition and the strong operational reliability. The two years practical operation has proved that the system proposed is effective for the environment-protection field.     

Paging Strategy Study of Mobile Communication Networks

In order to decrease the consumption of the limited bandwidth resource and the electronic power of mobile battery, fixed paging area strategy is adopted in most mobile communication networks currently. Although its application is very simple, it cannot reach the best performance. In allusion to this problem, we introduce four kinds of improved mobile paging strategies, and analyze their concrete implementation methods briefly. Their performances are compared with fixed paging area strategy. Moreover, the benefits,the drawbacks and the range of application of each scheme are pointed out for future study.     

Influences of the Populus deltoids seedlings treated with exogenous methyl jasmonate on the growth and development of Lymantria dispar larvae

Introduction The interplant signal transduction has been hypothesized for many years (Baldwin and Schultz 1983; Rhoades 1983). It has been found that the resistance to insects is induced not only in damaged plants but also in the neighboring undamaged ind…