论电视教材镜头的组接

文章阐述了电视教材制作过程中,镜头组接的重要意义和表现形式,着重论述了镜头组接过程中必须遵从的原则.     

老师也是“花儿”

任教初一（8）班思品的J老师请假一周，教务处决定由我接任。授课内容是新课标实验教材第四课《欢快的青春节拍》。J老师交代，第一、二框已授完，我只需按第三框“祝福青春”中的几个设计开展活动就可以了。翻开课本，里面果真“躺着”两项活动：“说一说我们所拥有的幸福”和“为伙伴写一句青春的寄语”。若按现成的活动开展，一节课倒也过得去，但总有一种被教材牵鼻子的感觉。为了创出新意，我决意将本课内容整合后自行设计几项活动，让学生们好好享受一番参与活动的乐趣。当然还有一点私念：趁代课之际尝试一把课改，即使失败也无伤面子。     

数学教学中培养学生创新能力的实践

本文通过分析数学在创新能力培养中的作用和数学教学中存在的问题 ,探索高校数学教学中创新能力培养的模式     

移动通信系统安全机制发展的研究

从移动通信系统演进的角度介绍了安全机制的发展历程,分析研究了2G的安全性措施,阐述了3G认证签权方案及其优缺点,并对移动通信安全机制提出了一些见解。     

Mid—Infrared Optical Parametric Oscillator Based on All—Solid—State—Pumped Periodically Poled LiNbO

We report the tunable mid-infrared generation with a periodically poled LinbO3(PPLN).Using an all-solid-state pumped Nd:YVO4 laser as the pump source and a PPLN nonlinear crystal with grating periods of 28.2-30.8μm,we have achieved wavelength conversion in the 2.90-4.05μm spectral range by period tuning.The use of confocal cavity design has brought a compact,all-solid-state configuration with an average output powers of idler up to -200mW.The maximum power of 277mW was obtained at the wavelength of 3.35um.     

工程造价咨询行业发展的制约因素及其对策分析

人才缺乏、企业体制结构制度安排上的限制、向寻租资本支付高额成本、研发不足导致的服务技术含量低下和高度同质化以及行业内普遍存在的诚信缺失等多方面因素阻碍了工程造价咨询行业的快速发展。这些因素不是孤立的，互相之间存在关联。应从企业体制结构制度安排这一更深层次的制约因素和行业公共资源配置两个方面寻找和制定相应的对策。     

Aligned ZnO Nanofibre Array Prepared by Vapour Transport in Air

An aligned zinc oxide nanofibre array has been fabricated by heating the mixture of ZnO, Ga2Oa, and graphite powders in atmosphere. The ZnO nanofibre showed a uniform size of about 150nm in diameter and 50μm in length. The nanofibres grew predominantly along one direction. Both x-ray diffraction (XRD) and Raman shift spectra show that the product is composed of ZnO with the typical hexagonal structure. The good crystallinity of these ZnO nanofibres has been verified by photoluminescence spectra with strong UV emission at 287nm and weak green band emission observed at room temperature. The component of the product was analysed by XRD,Raman shift spectrum, x-ray energy dispersion (EDX) and x-ray photoelectronic energy spectroscopy (XPS). The growth process and the characteristics can be interpreted by vapour-liquid-solid mechanism.