(e,2e)反应中剩余电子的屏蔽效应

在考虑了He原子(e,2e)过程中剩余电子对核的有效屏蔽之后,用修正后的BBK理论计算了入射能为40eV时,共面不对称几何条件下电子入射离化He原子的三重微分截面(TDCS)。结果表明:得到的理论曲线更接近实验数据     

有效碳链长度与链烷烃的物理化学性质

】　利用极化效应指数，构造了链烷烃的有效碳链长度。研究表明，链烷烃的许多物理化学性质与有效碳链长度成线性关系。     

正交实验法优化咖啡因提取实验工艺研究

从茶叶中提取咖啡因作为大学基础有机化学实验之一,是从植物中提取天然成分的一个非常经典的教学案例。通过对学生做实验过程的观察、实验结果的思考和文献的查阅,分析了影响提取咖啡因效果的几个因素,运用正交实验的原理对这几个因素进行探索,从而优选出了从茶叶中提取咖啡因的最佳工艺路线。     

高校历史学有效教学的评价体系研究

高校历史学有效教学既是一种技术或策略,同时也是一种观念,它所表达的是一种"发展"和"进步"的意义,体现了一种对理想状态的追求。有效教学包括"有效教"和"有效学"两个方面,当然二者也不可绝对分割。它要求高校历史教师不断地反思自己的日常教学行为。     

古希腊千古迷案“半费之讼”的法律探讨

古希腊著名的思想家和哲学家普罗泰哥拉向学生欧提勒士传授辩论技巧,教他替人打官司并约定,剩下的另一半学费则在他毕业后第一次替人打官司赢了之后再交.欧提勒士毕业后,总不去代理别人打官司,普罗泰戈拉只好到法院起诉学生欧提勒士.师生两人均运用诡辩技巧各执一词,据说成千古“迷案”.其实,无论是根据当时的古希腊自然法,还是根据古罗马的诚实信用原则或附生效条件契约,均可裁决学生支付另外一半学费.逻辑推理在法律思维中有局限性,更不可被诡辩误导.在实践中要善于破解诡辩.     

有限截面度对现浇混凝土空心楼盖内力的影响

介绍了现浇空心楼盖的技术优势,分析了有效截面度对现浇混凝土空心楼盖内力的影响,并得出了相应的结论。     

教学准备——B-SLIM教学模式中的重要一环

备课及教学准备是B-SLIM教学模式教学环节中的重要一环。它是教师在把握教材、了解学生认知水平和能力及整合各种教学资源的基础上，确定教学思路，对课堂进行预设的一个重要手段，直接关系到教学效果的好坏及教学质量的高低。教师必须精心做好每一节课前的备课及教学准备，以期实现有效的课堂教学。     

人体穿着服装时所受热应力的评价指标及标准

从人服装环境的角度,介绍了人体着装状态下所受的热应力评价标准和评价指标,分析了各指标的特点,并为今后进一步建立完善的热应力评价标准提出了建议.     

The definition of effective emissivity of land surface at the scale of remote sensing pixels

Remote sensing (RS) of land surface temperature (LST) is a very challenging problem at the present development stage of RS science. Tremendous efforts have been devoted to atmosphere correction and temperature emissivity separation (TES) of new LST product algorithms. However, the mechanism of directionality of thermal emission from land surface remains unknown, and even worse, there are confusions on the definition of the effective emissivity of land surface at the scale of RS pixels. The mechanism of directionality of thermal emission for isothermal pixels and non-isothermal pixels is different. For non-isothermal pixels (case in most canopy/soil structures), the directionality of their thermal emission is determined by both bidirectional reflectance distribution function (BRDF) derived emissivity and distribution patterns of temperature differences. A new definition is suggested to take into account material mixture, multiple scattering, and temperature variation within thermal infrared (TIR) RS pixels.     

Design and implementation of 1 GHz high speed data acquisition system

With the development of current electronic technology, numerous high-speed data acquisition systems provide a variety of potential benefits. This article describes a high-speed data acquisition system which consists of ECL logic and TTL logic devices, samples and stores data with a 1 GHz clock. This system is accomplished easily and works stably. A performance test of this system has been undertaken and the results show that the effective number of bits (ENOB) is more than 6.5 bits.