Three dimensional couette flow and heat transfer through a porous medium with variable permeability

This paper reports research on the effects of variations in injection velocity and permeability on the heat transfer and flow through a highly porous medium between two horizontal parallel plates situated at constant distance with constant suction by the upper plate. Due to this type of variation in injection velocity and in permeability the flow becomes three dimensional. The governing equations are solved by adopting complex variable notations to obtain the expressions for the velocity and temperature field. The skin-friction along the main flow direction and rate of heat transfer are discussed with the help of graphs.     

大学生学习动力缺乏的原因及对策探讨

以学习动机为核心的学习动力在大学生的学习中起着决定性的作用。然而 ,缺乏学习动力的情况在相当一部分大学生身上不同程度地存在着 ,这严重影响了大学生的学习。大学生学习动力缺乏的表现形式多种多样且成因各异 ,如何采取相应措施值得深思。     

美国教师专业化的原因分析

20世纪80年代美国提出了教师专业化口号,其原因是多方面的,如经济的衰落引发的教育和人才反思、科学教学的兴起等,但主要还是起因于教师职前教育不到位、聘用要求不严以及职后培训质量不高所造成的教师专业水平低等。     

青少年犯罪的原因及预防探析

近年来，青少年犯罪现象随着社会的发展、变迁而日益严重。青少年违法犯罪率的逐年增加，无异是显示了学生犯罪的增加。青少年犯罪行为是一种表象，在表象背后的真象是包括多因素交互作用的复杂历程。本文将从心理发展的观点来探析，青少年违法犯罪其人格特质之所以有的异于常态，首先在家庭教育，然后在学校教育环境中逐渐发展形成的。     

Consolidation behavior of cement- and lime/cement-mixed column foundations

The consolidation behavior of mixed in place cement- and lime/cement-mixed column was studied. Consolidation of the composite foundation was modeled as a three-dimensional axi-symmetric problem. The authors used the finite difference method to obtain the pore pressure variation with time at any location below the surface. A computer program developed by the authors was used to draw some interesting conclusions about the consolidation behaviors of cement- and lime/cement-mixed pile foundation. Finally, a combined model including the permeability coefficients of cement-mixed piles and soil, was studied and its feasibility was evaluated. Project supported by National Natural Science Foundation of China (No. 59908012) and Education Ministry of China     

CeO2载体对Au/CeO2催化剂CO氧化活性的影响

采用六水硝酸铈和氢氧化钠为反应物,用水熟合成法制备了纳米Ce02.并以不同合成条件下得到的CeO2为栽体,担载了相同含量的贵金属Au,制备了具有高活性的Au/CeO2催化荆.实验结果发现,以CeO1-2h为载体的催化剂在高温区易展现出较好的活性,而以CeO2-10h为载体的催化剂在低温区易展现出较好的活性.说明载体结构对催化荆的CO催化氧化活性有决定性的作用.     

论高校思想政治教育网络平台的建设

随着信息技术的高速发展特别是互联网的日益普及,网络已经成为大学生求知、社交、娱乐的重要途径。高校的思想政治教育要根据这些新的变化,加强在方法、手段等方面的改革与创新,不断拓展思想政治教育的新领域,打造高校思想政治教育的网络平台,整合校内网络资源,使之形成合力,充分发挥高校思想政治教育网络平台的功能和作用,抢占思想政治教育的新阵地。     

教师批评语分析研究

针对现实中频繁出现的师生矛盾,以课堂上教师与学生的会话分析模式和合作原则、礼貌原则为理论基础,借鉴刘焕辉先生在其著作《言语交际学》中提出的言语交际的基本规律,结合教师批评语在使用过程中独有的特点,总结出教师批评语的基本原则和使用策略。     

《淮南子》“无为”思想的内涵及其拓展

"无为"思想是道家哲学的基本思想,《淮南子》在以"道"为本体的基础上对老庄的"无为"思想进行了扬弃,同时融入改造了的儒、法两家的思想,使"无为"达到其哲学含义的最高水平,展示了汉初调和、致用的学术取向与思想特质。在政治层面上,《淮南子》通过"因"、"权"的运用对君主的"无为"加以拓展,强调"无为而治"的效果。     

Analysis on Chinese/English Code-Switching in Computer-Mediated Communication Based on Meme Theory

Nowadays,computer-mediated communication(CMC) becomes one of the most convenient ways for people to connect with each other in which Chinese/English code-switching has been frequently used and widely spread.The article will memeticly interpret this language phenomenon based on the authentic examples collected from various kinds of CMC,and point out that the Chinese/English code-switching in CMC is a kind of strong memeplex which includes many different strong memes,resulting in the popularity of Chinese/English code-switching in CMC.