Development of Light Weight Structures to Provide Blast-Resistant Designs

In the past, blast-resistant designs for structures were often constructed with massive type structural systems, which relied more on brute strength than on finesse to achieve the required blast resistance. However, structures composed of COLD-FORMED steel components, such as sheet metal and metal studs, have shown great promise in providing blast resistance with the added benefits of low cost and ease of construction. Some examples of using such structures to provide containment for package handling facilities (PHF) are described in the paper for situations where blast containment is needed, such as a potential package bomb being discovered during the package vetting process. Results from tests and analytic data are used to illustrate aspects of design peculiar to such types of applications. Designs for specific capacities of PHF are described.     

Dynamic Responses Analysis of a Building Structure Subjected to Ground Shock from a Tunnel Explosion

Dynamic responses of a multi-storey building without or with a sliding base-isolation device for ground shock induced by an in-tunnel explosion are numerically analyzed. The effect of an adjacent tunnel in between the building and the explosion tunnel, which affects ground shock propagation , is considered in the analysis. Different modeling methods, such as the eight-node equal-parametric finite element and mass-lumped system, are used to establish the coupling model consisting of the two adjacent tunnels, the surrounding soil medium with the Lysmer viscous boundary condition, and the multi-storey building with or without the sliding base-isolation device. In numerical calculations , a continuous friction model, which is different from the traditional Coulomb friction model, is adopted to improve the computational efficiency and reduce the accumulated errors. Some example analyses are subsequently performed to study the response characteristics of the building and the sliding base-isolation device to ground shock. The effect of the adjacent tunnel in between the building and the explosion tunnel on the ground shock wave propagation is also investigated. The final conclusions based on the numerical results will provide some guidance in engineering practice.     

Effect of Foam Cladding for Blast Mitigation： Numerical Simulation

Two numerical simulations were performed to investigate the protective effect of the foam cladding. One simulation is based on a previous experimental study, which is a ballistic pendulum with and without a foam cladding subjected to close-range blast loading. The other model is a steel beam with and without a foam cladding under blast loading. The overpressure due to the blast event can be calculated by the empirical function ConWep or by an arbitrary Lagrangian-Eulerian （ALE） coupling model. The first approach is relatively simple and widely used. The second approach can model the propagation of the blast wave in the air and the interaction between the air and the solid. It is found that the pendulum with the foam cladding always swings to a larger rotation angel compared to a bare pendulum. However, the steel beam with an appropriate foam cladding has a smaller deflection compared to the bare beam without a foam cladding. It is concluded that the protective effect of the foam cladding depends on the properties of the foam and the protected structure.     

电极烘炉新工艺在小黄磷炉生产中的应用

从烘炉的作用、机理入手，通过大小磷炉的烘炉方法对比，提出了大小磷炉使用电极直接升温烘炉的工艺，在升温方法、烘炉质量、磷炉使用寿命等关键数据方面进行了对比实验，获得一组数据。     

渗后胡萝卜丝热风干燥的研究

利用GZ—1型热风干燥试验设备对低浓度糖盐混合溶液渗后胡萝卜丝进行单因子试验,得出不同风温、风速下的薄层脱水方程.     

单片机温度控制系统的设计与实现

单片机温度控制系统是通过硬件和软件实现对电烤箱的温度控制,本文主要介绍了温控系统的设计方法。     

2019年中国高等教育热点回眸

回眸2019年被社会高度关注又被舆论广泛热议的高等教育话题,有利于我们在通过社会舆论详实而客观地记录鲜活的高等教育历史事件基础上,及时发现公众视域的高等教育热点问题、反思存在的现实问题、总结快速发展的高等教育改革问题,进而寻求促进高等教育高质量发展的改革思路和前进道路。基于此,笔者对浙江师范大学教育评论研究所网站"每日教育评论"栏目搜集的每日高等教育热点话题,通过分析其影响深度与"百度"搜索量进行研究与筛选,在确定每月一个高等教育热点话题的前提下,再参照社会舆论对每月热点话题的各种议论,以教育评论者的视角进行理性梳理与简要评论。     

中国图书馆发展中的十个热点问题

当前影响中国图书馆发展的十个热点问题是 :关于图书馆的生存价值、关于图书馆的范型转变、关于WTO与图书馆、关于免费和收费、关于虚拟参考服务、关于数字图书馆和资源描述、关于图书馆联盟、关于图书馆员的专业性、关于图书馆法和关于国际图联的改革及走向。参考文献 15。     

集装箱用SPA-H耐大气腐蚀钢的开发研制

为适应集装箱用耐大气腐蚀钢的需求,近年来,本溪钢铁(集团)有限责任公司采用铁水预处理、转炉冶炼、AHF精炼、连铸、热连轧及控轧控冷等工艺成功地开发了SPA-H耐大气腐蚀钢.通过化学成分和生产工艺优化,使钢材的各项性能达到标准要求.     

春雷霉素WP防治水稻稻瘟病田间药效试验

进行了春雷霉素防治水稻稻瘟病试验,试验结果表明,2％春雷霉素WP对水稻稻穗瘟有较好的防效,防效达91．0％-94．2％,试验剂量下对水稻安全无害,可以大面积推广应用,生产上推荐用量为112．45—181．25g／hm^2。