包纸处理对南果梨冷藏时生化变化的影响

研究了南果梨经保鲜纸包装后冷藏时果皮和果肉的蛋白质含量及多酚乳化酶同工酶的变化．结果表明：南果梨在冷藏中，果皮的蛋白质含量始终高于果肉，果皮的蛋白质含量至下降趋势；2月份多酚乳化酶同工酶谱带共有六条，其Rf值分别为：0．032，0．063，0．094，0．212，0．263，0．425，果肉的多酚乳化酶同工酶谱带明显少于果皮，保鲜纸处理后的南果梨在贮减时果皮多酚乳化酶同工酶谱带少于对照．     

稻纵卷叶螟的经济损害水平和经济阈值

以室内接虫、剪叶模拟以及田间调查等方法研究稻纵卷叶螟的为害对水稻产量的影响.初步确定了该虫在综合防治区的经济损害水平为39条幼虫/百丛(剑叶期)和58条/百丛(分蘖期).并提出用害虫种群潜在密度确定卷叶螟经济阈值的方法.     

Colluding in the ‘Torture’ of Poetry: Shared Beliefs and Assessment

Assessment is most often held responsible for teachers' and students' mechanical approach to poetry in class. This article shows how examination pressure leads a group of poetry teachers and A Level English students at a post‐16 college in Malta to perpetuate an approach to poetry that is characterised by an emphasis on finding hidden meaning. However, it is also argued that to blame only assessment for this approach is to run the risk of ignoring the shared beliefs that teachers and students have about poetry.     

普通话水平测试之应试问题分析及其对策

普通话水平测试的四项内容是字、词、朗读和说话。应试人在应试这四部分时,首先要注意了解测试范围及形式。应试字词部分时,注意找难点音,注意形近字、多音字,注意语速要均速,声音要坚实;应试朗读和说话部分时,朗读要注意语速、节奏及停顿;说话要思维清晰流畅,还要注意话题的选择及拟定说话提纲。     

基于扩展沙堆模型的企业精益管理实施水平分析

精益管理是一种先进的管理理念,我国许多企业已经开始引入并推行精益管理,但是我国企业的精益管理水平仍然较低,这很大程度上是由于缺乏一个较为完备的精益管理系统和精益管理水平评价体系。通过文献查阅和与专家进行讨论,对精益管理系统进行自组织判定,并依此构建企业精益管理的扩展沙堆模型,然后通过三层BP神经网络构建企业精益管理实施水平的评价模型用以评价企业的精益管理水平并取得了良好的效果。这对于企业了解自身精益管理实施水平并进行改善具有一定的指导意义。     

波导缝隙阵列天线的改进设计

针对天线E面远区副瓣电平抬高现象对天线进行改进设计,寻求改善方向图E面远区副瓣电平的方法。通过建立辐射阵面的数学与物理模型对阵面幅度分布进行微调,最后利用遗传算法对阵面辐射单元进行优化,解决了方向图E面远区副瓣电平抬高的工程应用问题。     

Drinking glucose improves listening span in students who miss breakfast

Low blood sugar level resulting from fasting has been shown to reduce performance on a number of cognitive tasks. In this study, 80 non-diabetic A-level students missed breakfast. They completed a version of Daneman and Carpenter's Listening Span Test at 9.00 a.m. Half were then given a drink containing glucose, while the other half received a saccharine drink matched for taste. After 20 minutes, both groups completed another form of the Listening Span Test. A subset of the sample had their blood glucose levels determined immediately before the drink and again before the second application of the test. Blood glucose levels did not change, but listening span performance significantly improved after a glucose drink yet not after a saccharine drink. It is concluded that missing breakfast does not seriously affect blood sugar levels in healthy young students, but listening span performance which is a good predictor of listening comprehension is improved when fasting individuals imbibe a glucose-rich drink, although not when a saccharine drink is drunk. Ideally students should eat breakfast, but if this is omitted, then a glucose snack or drink before the first class may reverse any adverse effects.     

俄罗斯对外俄语一级考试与我国高校俄语专业四级考试比较研究

俄罗斯对外俄语一级考试和我国高校俄语专业四级考试都是国家级标准化考试。该文介绍了二者的基本情况,并从等级标准、考试目的、考试形式、考试内容等方面对二者进行了比较,以期取长补短,促进教学。     

基于云计算层次架构的安全框架研究

云计算安全问题是限制云计算发展的主要问题,一直是IT 界研究的热点。介绍了云计算的特点和服务模式,总结了云计算的安全问题,最后根据云计算的层次架构探讨了解决各层次安全问题的安全策略,并在此基础上提出了一种云计算安全框架。     

停流光谱在蛋白质动力学反应中应用的研究进展

介绍停流技术的原理,概述在线停流和圆二色谱、荧光光谱等仪器联用的现状,并讨论其在蛋白质与其它分子相互作用动力学过程及机理领域的应用。