培训前沿扫描系列（二）：国家计算机软件专业考试概述

初级：程序员、网络管理员中级：软件设计师、网络工程师、数据库工程师高级：系统分析师     

绝妙的纳米画

你听说过"米上刻字"吗?熟练的工匠能在一粒大米表面刻上好几个甚至近百个字。现在,科学家借助最新科技,把这门手艺发展到了极致——在比头发丝的直径还小得多的纳米空间里画画。     

工学结合模式下光电技术人才培养探索

工学结合是新形势下职业教育人才培养模式改革的重要方向,是职业院校培养高技能人才的有效方式之一。特别在光电技术专业人才培养中,更要加强与企业的有机结合,以就业为导向,以光电专业职业能力培养为核心,以学生综合素质提高为目标,通过工学结合培养高技能人才。     

雷曼光电:高速成长的中高端LED制造商

我国LED制造业的龙头企业——深圳雷曼光电科技股份有限公司(下称:雷曼光电;代码:300162)日前登陆创业板,公司主要生产销售中高端LED封装及应用产品。目前,雷曼光电已拥有从LED器件封装到LED应用产品生产的产业链,确立了在行业中的强大技术竞争优势。     

多物体系统机械能守恒的误区扫描

多个物体组成的系统满足机械能守恒定律时,在解题过程中除了要注意机械能守恒条件的判断、零势能面的选取、不能漏掉各物体的各项机械能等常见误区外,还应注意系统机械能守恒中的以下几种典型误区．     

Dependence of electrical and optical properties of IGZO films on oxygen flow

Amorphous InGaZnO (a-IGZO) films were deposited on the corning eagle XG (EXG) glass substrates using magnetron sputtering method. The structure, surface morphology, electrical and optical properties of these films were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), semiconductor parameter analyzer and spectrophotometry, respectively. The influence of oxygen flow on the electrical properties of IGZO thin films was studied, showing that increasing oxygen flow changes the resistivity with six orders of magnitude. The contact resistance of ITO/IGZO is 7.35×10⁻² Ω·cm², which suggests that a good ohmic contact exists between In₂O₃: Sn (ITO) and IGZO film.     

Searching high gray scale FPD scanning matrix based on PSO

With the increase of gray scale and flat panel display (FPD) size, subspace bitwise scanning strategy can be replaced traditional scanning method to cut down frame frequency. However, the direct searching strategy (DSS) becomes unfeasible to obtain corresponding high gray scale scanning matrix. Thus, particle swarm optimization (PSO) is introduced to accelerate searching for high gray scale weights scanning matrix (WSM) with its parallelism and global optimization feature. Finally a WSM of 256 gray scales is found out successfully with Matlab, which both gray linearity and scanning efficiency are satisfied.     

常见物质检验试剂扫描（上）

物质检验是中学化学实验的重要内容,它指的是：根据物质的性质,使被检验物质与加入的试剂作用,转变为某种已知物质或产生某种特殊现象,从而确定该物质的存在。选择检验试剂时一般要符合以下条件：①反应要有良好的选择性,反应速率要快,操作要尽可能简单;②反应要有明显的外部特征,如变色、放热、沉淀的生成与溶解、气体的产生等;③要排除干扰物质的影响。