多功能电子防丢器的设计与实现

随着现代生活节奏的加快,人们遗失东西的现象经常发生,防遗失产品也就应运而生．文中设计并实现了一款多功能电子防丢器,它由母机和子机两部分组成,子机置于防丢物品上,母机由主人随身携带,具有防丢和寻找功能．子机留有的外接插孔可与其他传感器设备相连,构成相应的防盗报警系统．电路主要采用集成芯片制作,所以具有电路简单,工作性能稳定,功耗及成本低等优点．     

气体泄漏多维浓度场模拟装置研制及教学应用

科研案例教学法是推进科教融合、提升教学效果的重要举措.为了提升“燃烧学”“消防工程”等课程中关于气体的扩散行为及气体泄漏过程中的多维浓度场特征等抽象知识点的教学效果,研制了气体泄漏多维浓度场模拟装置,并以甲烷泄漏实验为例,将其应用于课程教学中.结果 表明,使用该装置后明显提升了学生对前述知识点的掌握程度,而且锻炼了学生...     

Disaggregated Effects of Device on Score Comparability

The use of tablets for large‐scale testing programs has transitioned from concept to reality for many state testing programs. This study extended previous research on score comparability between tablets and computers with high school students to compare score distributions across devices for reading, math, and science and to evaluate device effects for gender and ethnicity subgroups. Results indicated no significant differences between tablets and computers for math and science. For reading, a small device effect favoring tablets was found for the middle to lower part of the score distribution. This effect seemed to be driven by increases in performance for male students when testing on tablets. No interactions of device with ethnicity were observed. Consistent with previous research, this study provides additional evidence for a relatively high degree of comparability between tablets and computers.     

健身器材市场现状研究

采用问卷,实地调查等方法,对健身器材市场现状进行研究分析.得出目前体育健身器材种类少,价格高,占地面积大,质量监督机制不完善等.     

船舶机电设备智能故障诊断系统

基于船舶机电设备的复杂性和多样性,将专家系统和浏览器/服务器(B/S)三层体系结构模型相结合,建立一个通用的智能船舶机电设备故障诊断系统;介绍了故障树转化为专家系统规则的方法、事实的编码,以及系统的关键组件推理机的实现算法。     

企业移动社交网络访问安全风险分析

分析企业移动设备访问社交网络存在的安全问题。认为主要原因是社交网站或应用程序存在漏洞、移动设备防御能力低、企业员工安全意识淡薄;企业移动设备访问社交网络的安全风险主要来自恶意软件、网络诈骗、网络攻击和僵尸网络等。提出制定安全政策或员工服务协议、加强用户教育和培训、安装和更新安全软件、使用安全网关技术、加强设备配置和服务管理、制订移动设备数据丢失防护解决方案等对策。     

超磁致伸缩作动器的磁路设计

论述了超磁致伸缩作动器的基本原理,根据三种偏置磁场优缺点,选用增加单独线圈产生偏置磁场。在磁路分析的基础上,采用有限元仿真的方法,分析了不同参数和结构对各个组成部分的磁场影响。     

一种车用智能报警装置的研究

目前学界对车用儿童滞留智能报警装置的研究大多停留在设计层面上,市场投入利用还不多.通过详细介绍一种车用智能报警装置的研究过程、装置设计原理、技术特点和需攻克的难题等,来促进此类智能报警装置实现产品的市场化,从而防止儿童因车内温度和有害气体的积聚而发生的安全事故.且该装置是一种具有主动实施安全防范措施的电子智能化产品.     

Student-centred learning and disciplinary enculturation: an exploration through physics

This study argues that student-centred methods in the teaching of physics can be beneficial for students’ enculturation into the discipline and into a physicist’s profession. Interviews conducted with academics and students from six master degrees in physics in three different European countries suggest that student-driven classroom activities, collaborative learning and problem-solving, or integration in research groups/projects enable students to engage in practices similar to those which are part of professional scientists’ routine. Through interactive, participative methods reminiscent of cognitive apprenticeship, students develop a range of abilities necessary in a physicist’s career: capacity of explanation, argumentation and defence of claims; analytical reasoning; capacity to critically review literature; ability to discern research paths worth pursuing; writing skills; and interpersonal skills. These give them a first taste of what it is like to be a physicist and ease their transition into a professional physics career.