苯乙烯/甲基丙烯酸3-氯-2-羟基丙酯共聚物的合成与表征

制备了甲基丙烯酸-3-氯-2-羟基丙酯(CHPMA),采用自由基悬浮聚合的方法,使其与苯乙烯进行共聚合,首次合成了苯乙烯/-а甲基丙烯酸-3-氯-2-羟基丙酯线型无规共聚物,并用FT-IR和GPC对共聚产物进行了表征,讨论了聚合条件对产物收率的影响。结果显示该共聚物的数均分子量达到10万以上,其分子量多分散系数为1.72,有望用于极性橡胶(如氯丁橡胶等)与亲水性树脂(如聚丙烯酸、聚丙烯酰胺等)共混的增容剂以制备稳定性良好的特种功能材料——吸水膨胀橡胶。     

永远的鹳雀楼

浩如烟海的中国古典文学作品里，咏唱名山胜川、雄关塞楼的篇章不知有多少；但真正能够令人吟咏不厌、永远留在人们记忆里的还是那些名作佳构、华彩篇章。人们在那里认识了惟见天际流的长江，认识了从天上而来的黄河，认识了岳阳楼、滕王阁……一首仅20字的小诗，也让天下人知晓了黄河岸畔有一座很有名气的鹳雀楼。     

提高儿童少年跨栏教学效率的探索

针对业余训练过程中，训练时间有限、系统性差、跨栏项目难度大、成才周期长的困难，寻找使运动员尽快掌握跨栏技能的途径。采用献法、测验法、对比法等，依据“生长发育规律与身体素质的关系”，“跨栏技术特点与身体素质的关系”，采取“围绕技术练素质、发展素质促专项”的指导思想，对郑州市体校跨栏组1990～1996年在训的7名业余队员进行跟踪测验，实验表明，被试运动员通过2～3年训练，技术指数均呈上升趋势，并且专项成绩都达到了训练大纲优、良、及格的不同标准，为提高儿童少年业余跨栏教学的效率，提供了一种选择。     

The View from Above: Map Reading Skills Project

In South Africa the education system for black children is fraught with problems. These problems are the direct result of apartheid and have been compounded by poverty and illiteracy. In this article the problem of poorly qualified or unqualified teachers is discussed especially with regard to the teaching of map skills to children in their fifth school year. The project team needed to develop affordable materials which could be used in large classes by teachers after a very short period of training. Books and other materials which are available commercially were examined, but for various reasons were found to be unsuitable for local conditions. After determining the extent of the problem, the project team followed a grassroots process of developing a flip chart which teachers learnt to use with confidence and which enabled pupils to master the concepts and skills necessary for understanding a map.     

Reading Progress Monitoring for Secondary‐School Students: Reliability,Validity, and Sensitivity to Growth of Reading‐Aloud and Maze‐Selection Measures

The validity and reliability of curriculum‐based measures in reading as indicators of performance and progress for secondary‐school students were examined. Thirty‐five grade 8 students completed reading aloud and maze‐selection measures weekly for 10 weeks. Criterion measures were the state standards test in reading and the Woodcock–Johnson III Test of Achievement. Different time frames for each measure were compared. Most alternate‐form reliability coefficients were above .80. Criterion‐related validity coefficients ranged from .77 to .89. No differences related to time were found. Only maze selection reflected significant growth, with an average increase of 1.29 correct choices per week. Maze growth was related to the reading performance level and to change on the Woodcock–Johnson III from pre‐ to posttest.     

谈谈民族精神研究的一个问题--以民族实体和民族精神为例

中国近现代哲学开始了对民族精神的研究,民族精神研究是民族自我认识、自我觉醒的过程,是突出中国哲学的主体性和民族性的过程.民族精神研究的基础和关键问题是作为实体概念的民族和作为属性概念的民族性、民族精神.     

论我国企业品牌国际化体育营销战略

过对我国企业品牌国际化体育营销现状的分析,揭示了我国企业在品牌国际化体育营销中存在的问题,提出我国企业品牌国际化体育营销战略的对策和建议     

世界新闻通史体系刍议

本文归纳了已有外国新闻史研究的四种模式 ,并指陈其利弊。在此基础上 ,提出建立世界新闻通史体系的治学观点———空间上 ,能涵盖中外 ,以整个世界新闻传播全局为对象 ;时间上应古今贯通 ;研究对象上应涉及新闻事业、新闻制度和新闻观念     

体育锻炼的选择对治疗焦虑的影响

焦虑是一种常见的不良情绪体验 ,通过体育锻炼可以达到对焦虑的治疗作用。体育锻炼的各种特征 ,如活动类型、强度、持续时间等都会对焦虑的治疗效应产生重要影响。因此 ,必须具体问题具体分析 ,因人而异 ,不同的人选择不同的锻炼方法 ,才有可能使体育锻炼治疗焦虑取得最大的效果。