高职学生行业英语自主学习能力动态研究

通过问卷调查和访谈,对高职学生的行业英语自主学习能力展开了动态考察,并基于教师和环境两个因素探讨了其变化的归因情况。两次问卷数据对比显示,学生的行业英语自主学习能力存在提升的趋势,教师因素和环境因素对学生的自主学习有促进作用。访谈结果表明,教师教学理念和教学方法的更新以及自习环境和实践环境的建设有助于学生行业英语自主学习能力的提升,具体体现在行业英语学习兴趣的提高、自主学习意识的提升以及自我效能感的强化等方面。由此可见,教师合理有效的介入和理想的学习环境是促进学习者自主学习的必要条件。     

信息共享环境探析

信息共享环境是便于信息共享的一种方式,它的发展需要6个必需的领域:政策、程序、纲领、系统、构架与标准.本文对信息共享环境的概念、构建与发展进行了探讨与分析.     

Increasing Glucose Concentrations Interfere with Estimation of Electrolytes by Indirect Ion Selective Electrode Method

The estimation of electrolytes like sodium (Na⁺), potassium (K⁺) and chloride (Cl⁻) using direct and indirect ion-selective electrodes (ISE) is a routine laboratory practice. Interferents like proteins, triglycerides, drugs etc. are known to affect the results. The present study was designed to look into the effect of increasing glucose concentrations on estimation of Na⁺, K⁺ and Cl⁻ by direct and indirect ISE. Pooled sera was mixed with glucose stock solution (20 g/dL) prepared in normal saline to obtain glucose concentrations ranging from ~100 to ~5000 mg/dL. Na⁺, K⁺ and Cl⁻ levels were estimated by direct and indirect ISE analyzers and results were statistically analysed using ANOVA and Pearson’s correlation. Similar experiment was also performed in 24 h urine sample from healthy subjects. Significant difference was observed between Na⁺ and Cl⁻ measurements by direct and indirect ISE, with indirect ISE values being consistently higher than direct ISE. Besides this, significant difference was observed amongst Na⁺ and Cl⁻ values from baseline values obtained by indirect ISE at glucose concentrations ≥2486 mg/dL. However, no such difference was observed with direct ISE. Na⁺ and Cl⁻ estimation by indirect ISE showed significant negative correlation with glucose concentration, more so, above ~2000 mg/dL. K⁺, however, showed no significant difference with varying glucose. Similar results were observed in 24 h urine samples with a significant difference observed amongst Na⁺ and Cl⁻ values at ≥2104 mg/dL glucose. Thus we conclude that high glucose concentrations interfere significantly in estimation of Na⁺ and Cl⁻ by indirect ISE in serum as well as urine.

Electronic supplementary material

The online version of this article (doi:10.1007/s12291-015-0522-0) contains supplementary material, which is available to authorized users.     

基于ISE的AlGaN/GaN HEMT的C-V 转移特性模拟

主要叙述了在ISE软件平台上对AlGaN／GaN HEMT的转移特性以及C—V特性的模拟．首先实现了通过引入δ掺杂层的方法对器件的极化效应的模拟．其次,在此基础上改变了的AlGaN／GaN HEMT中spacer层的厚度,分别模拟了器件的转移特性和C-V特性．从结果得知,随着spacer层厚度的增加器件的跨导和电容均有所降低,所以应该在不同的应用领域选择不同的spacer层厚度．     

即时搜索引擎及其发展趋势探析

即时通信、文本碎片化、信息频繁更新、社区化、漂移化等是Web2.0时代信息的显著特点,这对传统搜索引擎的工作方式带来了前所未有的挑战。信息的动态聚合和即时搜索应是网络搜索引擎未来发展的重要方向。文章探讨了即时搜索的基本特点、工作原理、体系结构等,并展望了即时搜索对未来搜索引擎的影响。