纳米金属蒸镀高密度录像带的制作原理与工艺

纳米金属蒸镀高密度录像带是纳米材料与纳米技术成功应用的范例之一 .阐述了纳米金属斜蒸镀的基本原理 ,给出了纳米金属蒸镀录像带 (ME tape)磁层的柱状结构 .介绍了蒸镀带生产过程中对原材料的要求及生产工艺 ,并将其性能特征与通用 VHS录像带做了对比     

教育实习微型课程设计的“意义取向”探究

教育实习微型课程为教育实习从课程方面提供了一个新的理论视野。目前我国教育实习微型课程是以“效率取向”进行课程建构的,但由于“效率取向”的课程存在着重技术理性、重目标实现以及问题解决等缺陷,因此,有必要从关注课程的文化内涵、重视学生意义的生成与价值以及积累学生的教学实践智慧等方面构建“意义取向”的教育实习微型课程。     

A Purposeful Collaboration: Using a Library Course Enhancement Grant Program to Enrich ESL Instruction

Developing a meaningful collaboration with teaching faculty to enhance courses can be a challenge for information professionals as they struggle to move away from the one-shot classroom lecture model. The Association of College & Research Libraries encourages the use of mini grants for this purpose. These incentives can jump-start partnerships in a needed area, such as English as a Second Language (ESL) instruction. The article describes The Ohio State University Libraries Course Enhancement Grant Program and its positive impact on a subject librarian and ESL instructor teaching collaboratively in a composition course, with an analysis of students’ assessment of course objectives and outcomes.     

基于单片机PWM驱动电路的智能遥控研究

无线遥控器由TX-2B进行编码控制按键,将数字脉冲信号输入到AT89C51单片机的P1.0-P1.4口,控制单片机对应输出的P3.0-P3.3口的PWM信号控制功率管驱动电路,由直流电动机带动现有玩具小车机械传动装置,实现遥控电动玩具车的动作功能。     

例说微型小说的审美特征

与长、中、短篇小说相比,微型小说有着独特的审美特征,即:摄取富于孕育性的瞬间;人物极少,情节单一;多用白描,留下空白;结尾精彩,出人意料。     

Splitting PMMA with Mini Cutting Explosives

In order to improve the present aviation ejection escape system, the application of explosion cutting technique to aviation escape system is proposed to weaken the strength of canopy before ejecting it. A series of mini cutting explosives are designed to investigate the process of splitting PMMA plate. The phenomenon of spallation in PMMA is observed. The effects of different parameters of mini cutting explosives on the cutting depth are obtained. Consequently the appropriate material of half-circular metal covers, explosive types and the ranges of charge quantities are determined. On the other hand, the cutting process of aviation PMMA plate by mini cutting explosives is simulated by means of nonlinear dynamic analysis code LS-DYNA. In finite element analysis,Arbitrary Lagrangian Euler (ALE) algorithm is used to depict the fluid property of high energy explosives. Continuous damage material model is used to simulate the complicate dynamic damage behavior of PMMA due to explosion shock waves. Only sliding contact option is defined to fulfill the fluid-structure interaction between explosives and PMMA plate by distributed parameter methods. Phenomenon of spallation observed in the experiment is presented in the simulation. The relationship between the penetration depth of PMMA plate and charge linear density obtained by numerical simulation agrees well with experimental result.     

心态式微型小说艺术变化摭谈

心态式微型小说比其他类型的微型小说显示出了更加丰富多彩的艺术变化，除了一般微型小说常见的反转、曲转、扩大和反馈外，还有一些更适合自己的艺术变化形式，如复原、缓转和复沓等。     

基于微信小程序的地震仪器管理平台研究

目前地震前兆观测仪器学科种类繁多,仪器组成复杂、备机备件信息不易及时完善等现象较为普遍。为提高仪器管理运维人员工作效率,实现地震前兆观测仪器信息化管理,采用微信小程序应用开发方式,通过分析华南片区仪器运维管理功能需求,研究微信小程序关键技术并比较应用程序性能,发现微信小程序具有占用内存小、开发框架简单、便于后期维护升级等优势,在地震前兆观测仪器管理信息化工作中具有一定的实用性。     

基于嵌入式构件的医疗物联接入网关硬件设计与实现

文章介绍了一种利用内嵌网络控制模块ArmCoretex-M4芯片作为主控器设计医疗物联接入网关的方法,着重介绍了芯片最小系统,信号采样和网络输出三个模块的设计,并给出详细的电路图,通过构建的测试系统验证了网关的正确性和实用性.     

基于“微课题研究”的植物生理学实验教学探索

让学生参与课题研究、体验科研过程是培养学生创新思维能力最有效、最直接的手段。在实验课程的教学中教师面临的最大挑战是激发学生的学习热情。文章以普通师范院校植物生理学实验课教学为例,将经典的实验设计成微课题形式,通过引导学生参与课题研究,帮助学生理解最基本的原理,提高他们的学习兴趣,培养科学的思维能力。文章设计了适合大班上课的教学程序和能指导学生有目的学习的评价体系,达到在大班教学中引导学生有效开展课题研究的目的。