略谈阅读指导

初中生阅读水平较低是一个较普遍的现象。语文老师应指导学生扩大阅读视野,提高阅读兴趣,注重朗读默读,培养把握全篇、突出重点的能力,学会比较阅读的方法。     

锅炉给水泵富裕扬程过高的危害

通过对锅炉水泵的H－Q曲线及P－Q曲线的研究分析，结论为泵的富裕扬程过高，将使整个系统的效率降低，还会使泵产生气体，发生汽蚀和供水不足，并提出了相应的解决方法。     

网络环境下的信息资源建设新问题与管理

网络环境下,图书馆信息资源建设面临馆藏文献和网络资源收藏和发展的政策制定、重组与整合、结构模式、组织形式、利用和知识产权等新问题。要探索新的管理模式,制定新的发展政策和标准,合理配置资源、建立资源整合保障体系,做好特色数据库、虚拟馆藏导航、数据的宣传和推荐工作,实现全方位优化的有机发展体。     

张北试区降水规律与防沙尘暴对策

本文明确了以张北为代表的坝上地区年降水量分布符合正态分布,其长期变化趋势存在20年的周期,有89.97％的年份年降水量≥300mm;月降水量高度集中且变异系数小,一年中70％的降水量集中在6、7、8三个月。在明确降水规律的基础上提出5项防沙尘暴对策。     

师生交流的传播学分析

师生交流是一个贯穿教育全过程的重要概念,对它的研究不能仅仅停留在师生之间教学内容的传达上。该文以传播学的理论来分析师生交流的形式、手段、主要内容及不同定位产生不同的效果等,意在使师生交流在更宽的领域得到更深入的研究。     

论网络环境下的隐私权保护

文章通过论述网络隐私权的性质、由来、侵权行为的表现极其特征,从理论、法律和实践的视角探 讨网络隐私权保护问题。     

Proteomic analysis of human umbilical vein endothelial cells exposed to PM<Subscript>2.5</Subscript>

Exposure to fine ambient particulate matter (PM_2.5) is known to be associated with cardiovascular disease. To uncover the molecular mechanisms involved in cardiovascular toxicity of PM_2.5, we investigated alterations in the protein profile of human umbilical vein endothelial cells (HUVECs) treated with PM_2.5 using two-dimensional electrophoresis in conjunction with mass spectrometry (MS). A total of 31 protein spots were selected as differentially expressed proteins and identified by matrix-assisted laser desorption/ionization-time of flight (MALDI-TOF) MS. The results demonstrated that DNA damage and cell apoptosis are important factors contributing to PM_2.5-mediated toxicity in HUVECs. It is further proposed that PM_2.5 can inhibit superoxide dismutase (SOD) activity and increase reactive oxygen species (ROS) and malonaldehyde (MDA) production in a concentration-dependent manner. Induction of apoptosis and DNA damage through oxidative stress pathways may be one of the key toxicological events occurring in HUVECs under PM_2.5 stress. These results indicated that the toxic mechanisms of PM_2.5 on cardiovascular disease are related to endothelial dysfunction.     

现代家庭经济活动的资源约束与新经济人假定

在市场经济条件下，家庭是一个集生产、投产和消费为一体的微观经济主体，家庭的这些经济活动要耗用大量的资源，包括人力资源、物质资源和时间资源。然而资源总是有限的，存在一个配置效益问题。这样，如何合理使用资源以使家庭获得的效用达到最大，这便成为家庭经济行为合理化的一个重要命题，也是直接影响整个国民经济效果的重要因素。     

短跗星花金龟体表元素的X射线荧光光谱检测

采用Ｘ射线荧光光谱仪对体表为古铜色并有金属光泽的短跗星花金龟进行了体表（背、腹面）无损多元素定性检测。样品灰化后，对其灰又进行了多元素定性检测。结果发现，此种金龟子体表所呈现的金属光泽与虫体含有较多的Ｃｕ、Ｚｎ有关。     

ON THE REE ACROSS THE PERMIANTRIASSIC BOUNDARY IN SOUTH CHINA

This paper discusses the INAA results of REE in clays atand near some Permian/Triassic boundaries of South China.It showsthat the REE patterns of boundary clays differ from those of non-boundary clays.One difference is that the boundary clays are moreenriched in LREE,with steeper slope of REE and a smaller Eu nega-tive anomaly than the non-boundary clays.Another difference is that theboundary clays show a small Ce negative anomaly,but no Ce anomalyoccurs in the non-boundary clays.From these REE patterns and some other experimental facts,it isproposed that the P/T boundary clay may be a mixed product consistingof the acidic-intermediate ash and the upper crust substance representingsputtering component,and the calculated fraction of the former andlatter is 7/3.