走向交际能力测试的英语高考--分析近年英语高考的命题原则

本文试着以英语语言测试交际能力理论中命题原则的角度评析近年英语高考的试卷命制情况,从而得出英语高考已逐步走向交际能力测试模式,使英语高考比传统测试方法更能科学地测试考生语言能力,更能建设性地发挥对英语教学的积极反拨作用。     

大学生网络使用与网络成瘾的关系研究

大学生网络成瘾现象日益引起学校和社会的关注,对294名大学生的网络使用和网络成瘾的调查表明:大学生最常使用的网络服务是信息查询、电子邮箱、多媒体娱乐等,主要的上网动机是获取信息、娱乐和学习;有2%的大学生有严重的网络成瘾症状,31.3%的大学生有轻微成瘾症状;网络使用与网络成瘾有显著相关,上网时间过长及较多使用网上聊天I、CQ、网络游戏和多媒体娱乐的人更容易出现网络成瘾症状。     

Production of a monoclonal antibody against oxytetracycline and its application for oxytetracycline residue detection in shrimp简

A novel monoclonal antibody (MAb) against oxytetracycline (OTC) was generated and characterized. The MAb was used in the development of an enzyme-linked immunosorbant assay (ELISA)-based detection system. An OTC-bovine serum albumin (BSA) conjugate was prepared and used in the immunization of mice. A conventional somatic cell fusion technique was used to generate MAb-secreting hybridomas denoted 2–4F, 7–3G, and 11–11A. An indirect competitive ELISA (icELISA) was applied to measure the sensitivity and specificity of each MAb in terms of its 50% inhibitory concentration (IC50) and percentage of cross-reactivity, respectively. MAb 2–4F exhibited the highest sensitivity, with an IC₅₀ of 7.01 ng/ml. This MAb showed strong cross-reactivity to rolitetracycline, but no cross-reactivity to other unrelated antibiotics. When MAb 2–4F was used to detect OTC from shrimp samples, the recoveries were in the range of 82%–118% for an intra-assay and 96%–113% for an inter-assay. The coefficients of variation of the assays were 3.9%–13.9% and 5.5%–14.9%, respectively.     

Support for Students with Hidden Disabilities in Universities: A Case Study

More students with disabilities are accessing the tertiary sector with many disabilities not easily observed (or hidden), because there are no physical indicators. These “hidden” disabilities affect a variety of cognitive processes and may be developmental or acquired. To ensure students with hidden disabilities can enrol, engage in and benefit from tertiary education, universities generally provide a range of supports. Typically these supports and any reasonable adjustments are negotiated with students taking into account a number of factors including, where available, any supporting documentation that they might be able to provide. This case study reports efforts within one large Australian university to support higher education students with hidden disabilities on campus. Perceptions on the use of and barriers to support available were collected from seven undergraduate students who self-identified as having hidden disabilities and from eight support staff. Results indicated that students found their informal networks to be their most effective supports, closely followed by clear, caring and flexible lecturers and tutors. There were mixed positive and negative perceptions reported on the universal and disability-specific supports available. Implications and future research directions are discussed.     

基于自适应预测算法的APF无差拍控制方法

有源电力滤波器（active power filter, APF）补偿电流跟踪控制要求具有较高的稳态精度和较快的动态响应速度。文章将自适应预测滤波算法应用于无差拍控制,实现APF补偿电流精确控制。根据APF时域数学模型,推导滤波系统的无差拍控制离散方程;通过自适应(finite impulse response filter, FIR)预测滤波算法实现基波电流预测,消除控制系统的计算延迟,给无差拍控制提供所需的指令电流预测值。对预测算法进行MATLAB仿真,验证预测算法的稳态精度和动态跟踪快速性;实验室样机验证控制实验结果证明所提出的控制策略有效的,具有一定的实用性。     

基于PCA-LLE组合的优化RBF神经网络降水预测模型

提出了主成分分析(PCA)和局部线性嵌入降维方法(LLE)组合的优化RBF神经网络降水预测模型,首先利用主成分分析(PCA)和局部线性嵌入降维方法(LLE)组合对众多气象物理因子降维提取有效因子,再将这些综合有效因子组成的特征空间矩阵作为优化的RBF神经网络的输入矩阵,从而建立网络模型.以此对广西5月三个不同区域平均日降水量进行预报实验,结果表明,该模型具有较好的收敛效果和泛化能力,在预报性能上明显优于同期的T213降水预报、PCA预报、LLE预报,预报稳定性好,预报准确率较高,具有一定的普遍适用性.     

RFID智慧校园安防管理系统研究与应用

针对校园管理存在的信息处理手段落后的问题,提出了一种基于RFID远距离自动识别技术的校园安全管理系统设计方案,给出了无线传感器和中间件技术在系统软件中的应用。实验结果表明,该管理系统能够对校园安全实行全方位的监控和管理,非工作人员接近重要或危险区域自动报警,学生在校内信息及时与家长互动,实现了校园安全管理的实时自动化,提高了校园安全管理效率。     

库记录的录入编辑技巧

用ＲＥＡＤ及ＲＥＡＤＫＥＹ（）函数模拟ＢＲＯＷＳＥ全屏幕编辑格式,利用代码实现数据库录入数据的简化操作,从而提高录入速度。     

溴化[2—(5—己基—1,3—二氧环己烷——2—基)乙基]三乙基铵的合成<英>

以1—溴己烷,丙二酸二乙酯和丙烯醛为原料,经五步反应首次合成了溴化[2—(5—己基—1,3—二氧环己烧—2—基)乙基]三乙基铵(h).     

关于N(2,2,0)代数的弱幂零元的若干结果(英文)

引入了N(2,2,0)代数的弱幂元的概念,讨论了其弱幂元的若干性质.