黄河决徙与黄河冲积扇发育关系初探

在论证黄河冲积扇仍处于建造时期当中,得出决徙是建扇过程发生的自然现象.下游河道历史上两期安流跟两期暖湿气侯背景的出现不无联系.治河方向应以滞缓建扇过程和保护河口海岸为原则,这样才符合自然规律.     

Ru2 and Ru encode mouse orthologs of the genes mutated in human Hermansky-Pudlak syndrome types 5 and 6

Hermansky-Pudlak syndrome (HPS) is a genetically heterogeneous disease involving abnormalities of melanosomes, platelet dense granules and lysosomes. Here we have used positional candidate and transgenic rescue approaches to identify the genes mutated in ruby-eye 2 and ruby-eye mice (ru2 and ru, respectively), two 'mimic' mouse models of HPS. We also show that these genes are orthologs of the genes mutated in individuals with HPS types 5 and 6, respectively, and that their protein products directly interact. Both genes are previously unknown and are found only in higher eukaryotes, and together represent a new class of genes that have evolved in higher organisms to govern the synthesis of highly specialized lysosome-related organelles.     

贫困山区教育工作存在的问题及对策

文章在分析贫困山区教育工作存在问题的基础上，提出了相应对策建议。     

交际法在英语语法教学中的应用

How to teach English grammar effectively is an important subject of the comprehensive course for English majors. The Communicative approach must be applied to the English grammar teaching. This paper illustrates the features of communicative grammar teaching and necessity of applying communicative approach to English Grammar Teaching and how to apply communicative approach to English Grammar Teaching. In classroom teaching, a variety of communicative situations should be created without dull teaching; a colorful of classroom activities should be designed; real situation communicative practices should be intensified to make English grammar teaching active and efficient.     

论《史记》滑稽人物的讽谏艺术

司马迁在《史记.滑稽列传》中,刻画了一群社会地位低下,但能言善辩、诙谐幽默的滑稽人物群像。这些滑稽人物常采用以隐喻显、欲擒故纵、优孟衣冠的方式,用微言婉语来进谏,表现出了非凡的讽谏才能。比喻、反语等修辞方法的运用大大增强了滑稽人物讽谏的说服力。     

弯曲晶界对GH220合金疲劳性能的影响

二类不同热处理的GH220合金进行了疲劳试验。结果表明,等温处理的合金的疲劳性能高于标准处理的。详细讨论了这一差别的原因。     

聚丙烯腈热氧稳定化纤维鞘芯结构的控制

本文采用考特尔—3K原丝,在烘箱中模拟连续预氧化过程,研究了氧化温度和时间对纤维鞘芯结构的影响。实验结果表明,仅当四段实施的氧化温度分别都低于每段进口丝的初始放热温度(DSC结果,5℃/min)时,才可获得无芯的稳定化纤维。     

大电流多输出开关型稳压电源的实现

为解决大电流多输出稳压电源在输出功率时其辅助输出路的稳压和限流较难的问题，利用磁饱和特性，提出一种后相校正技术，并据此原理设计出了一种新型开关电源装置．仿真与实验结果表明，该稳压电源的效率达85％，电压稳定度达98．5％．将该稳压电源应用于实际工程中，发现其具有实用价值与推广意义。     

用户管理系统在数字电视业务中的应用及其发展趋势

在概述数字电视用户管理系统(SM S)的基础上,分析SM S的发展过程及其在数字电视业务中的应用功能,并展望SM S的未来发展趋势。     

基于人工免疫系统的计算机网络安全策略

分析了人工免疫系统的发展现状,介绍了计算机免疫系统的实现机理,提出了一种人工免疫系统的体系结构,展望了人工免疫系统在计算机安全中的应用前景。