中小规模高校校园网络规划设计

网络技术日新月异,对于中小规模高校校园网络这一特定网络环境,面对如此繁多的技术进行规划设计,要从中小规模高校校园网络的用户需求入手,对当前热门技术及产品作出合理的取舍,保证校园网络的经济性,先进性,可靠性及可扩充性。     

新显色剂5-(8-喹啉偶氮)-2,3-二羟基吡啶分光光度法测定微量钴

用作者合成的嘶试剂5-(8-喳啉偶氮)-2,3-二羟基吡啶作显色剂,以分光光度法测定微量钴,在PH9.3的硼砂缓冲溶液中,配合物的最大吸收波长在624nm处,钴量在0～20μg/25ml范围内符合比尔定律,表观摩尔吸光系数为9.0×10~4L·10mol(-1)·cm(-1)。方法简便、快速,应用于维生素B_(12)和镍盐中钴的测定,获得满意结果。     

“指导发现法”在生物教学中的尝试

所谓“指导发现法” ,就是在教师指导下 ,按照教学大纲的要求 ,引导学生发现问题 ,解决问题 ,从而达到实施素质教育的目的 .我在教学实践中 ,注重借鉴目前较先进的教学思想和教学方法 ,结合生物教学的实际 ,将“指导发现法”运用于课堂教学 ,变传统教学中的“灌输式”为引导学生自主学习的“启发诱导式” ,取得了比较显著的教学效果 .     

xyZET: A Simulation Program for Physics Teaching

A simulation program, named xyZET, has been developed to support the teaching of physics and the preparation of interesting and challenging exercise material. xyZET offers a rich and complex user interface, which allows the development in 3D-space of numerous experiments in basic mechanics and electricity. It is also possible to visualize effects dependent upon relativistic changes of mass. In addition, the radiation of accelerated charge carriers can be demonstrated in accordance with the Linard Wiechert theory. A special learner mode has been implemented as an alternative to the normal working environment in which all the control elements are available to the user. In this learner mode, the program can be controlled by Java applets embedded in WEB pages. By clicking on active buttons, communication with the simulation program is established, using the TCP/IP protocol. This allows the learner to concentrate fully on the topic, and frees him or her from any control activity which might divert attention from the underlying science. Using xyZET and this external control feature a complete mechanics course has been developed, containing most of the traditional topics taught in 11th grade at German high schools (Gymnasium). The course material has been tested under classroom conditions and proven to be stable and effective. Further improvements can be expected if students have access to more powerful computers and more support and time is provided to allow exploratory and self-supported learning. xyZET was developed under UNIX and X-windows and runs on PC platforms under LINUX or Windows95/98.     

男子标枪运动员“第二支撑制动现象”的运动学特征分析

借助KS— 16mm高速摄影机 ,对我国第五届大学生运动会前 8名男子标枪运动员最后用力双支撑阶段的投掷动作进行了拍摄。研究结果 :把髋理解为“第二支撑制动环节” ,有助于对该环节的重视 ,更有助于了解其在最后用力过程中产生制动所发挥的作用。“第二支撑制动现象”的出现 ,对上肢的“鞭打”动作 (投掷效果 )有着直接的影响     

析4s轨道与3d轨道能

本文从轨道能、能级、屏蔽效应和钻穿效应这四个概念入手 ,运用计算轨道常见能量的两种方法进行分析和比较轨道能与 3d轨道能     

STUDY ON THE CHEMICAL CONSTITUENTS OF EUONYMUS ALATUS(THUNB.) SLEB.

Ｅｕｏｎｙｍｕｓａｌａｔｕｓ(Ｔｈｕｎｂ.)Ｓｌｅｂ.(Ｃｅｌｅｓｔｒｃｅａｅ)ｗａｓｒｅｇｉｓｔｅｒｅｄｅａｒｌｙｉｎＳｈｅｎｇｎｏｎｇＢｅｎｃａｏａｓ″ｇｕｉｊｉａｎｙｕ″,ａｎｄｉｓａＣｈｉｎｅｓｅｔｒａｄｉｔｉｏｎａｌｍｅｄｉｃｉｎｅｆｏｒｔｒｅａｔｍｅｎｔｏｆｓｔｏｍａｃｈａｃｈｅ,ｗｏｕｎｄ,ａｍｅｎｏｒｒｈｅａ,ｄｅｒｍａｔｉｔｉｓｒｈｕｓａｎｄａｓｔｈｍａ(Ｗｕ,1988).Ｓｏｍｅｓｔｅｒｏｉｄｓ,ｆｌａｖｉｎｏｉｄｓ,ｔｒｉｔｅｒｐｅｎｅｓ,ｅｎｚｙｍｅｓａｎｄｓｅｓｑｕｉｔｅｒｐｅｎｅｓｗｅｒ…     

虚拟现实技术在雕塑创作中的应用

本文论述了虚拟现实技术的基本特征,国内外的发展概况,并以一个实例来阐述虚拟现实技术的应用、存在问题和今后的发展方向。     

顶端优势与植物激素

文章综述了生长素、乙烯、细胞分裂素、脱落酸在顶端优势中作用的研究现状     

“3 X”背景下高中生物教学对策浅谈

为适应“3 X”高考模式,全面提高中学生物教学质量,中学生物教师要审时度势,做好充分的思想准备及教学储备,同时还要做好学生的思想工作,使之形成浓厚的学习气氛。