地下工程静电除氡原理与试验

为了解决目前地下工程内部氡污染严重的问题,减少氡污染对地下工程内部工作人员健康的威胁,在综合比较和总结目前各国降氡技术的基础上,针对氡子体的存在形态及其特征,进行了静电除氡技术的可行性分析;研究了静电除尘的机理,对双区静电除氡技术进行了设计和研究,利用静电除尘的方式将结合态氡子体吸附去除;研制了双区静电型除氡装置,并结合工程实际做了相关的试验测试.结果表明:该装置具有高效的净化除氡功能,开机4h后的除氡率在90％以上.     

关于地域和地域设计的认识 本土之土

需要承认,关于地域设计的思考与言说是一件十分棘手的事情,地域或者地域设计实际上都非常难以讨论,他们都牵涉了太多令人困惑的社会生活内容,而且这些内容又在快速地生成与变化之中,同时,人们的确已感到了一种压力或者危险,人们看到已经存在了几千年的地域文化差异面临甚至已经就在     

盐城市体育馆

现代化的综合性体育馆要满足专业性强、布局紧凑、功能多样、节能高效、以馆养馆等多项要求。江苏省盐城市体育馆是第十届全运会的比赛馆之一,赛时使用和赛后利用的兼顾、追求专业性与综合性的统一,是该馆建筑设计的重要内容。     

Efficient synthesis of enwrapped CuO@rGO nanowire arrays to improve supercapacitor electrode performance

Journal of Applied Electrochemistry - There has been a growing interest in the performance of supercapacitors (SCs) based on Transition Metal Oxides (TMOs). It has recently been included in...     

Comparison of ablative and compressive mechanical behavior of several PICA-like ablative materials

It is significant to compare the ablative and compressive mechanical behavior of different PICA-like materials in the engineering applications. The plasma wind tunnel ablation tests with high-entropy air and CO_2 atmospheres, and compressive experiments in the ambient and 150℃, were conducted for three kinds of PICA-like materials(CF/PR-Si, CBCF/PR-SiOC and NQF/PR-Si composites). The traditional carbon/phenolic(C/PR) braided composites were also used for comparison. PICA-like materials have the better thermal insulation than traditional C/PR composite, especially for CBCF/PR-SiOC composite. The ablation behavior of CF/PR-Si and CBCF/PR-SiOC PICA-like materials in the CO_2 atmosphere can produce a large amount of SiO_2 in the form of coatings, oxide layers and skeletons on the ablated surface, which are greatly different from that in the air atmosphere.The compressive behavior of PICA-like material is greatly depended on the fiber fabrics, and exhibits the large discrete characteristics. The longer fiber in the PICA-like materials plays the role in maintaining the material integrity, while it may increase the thermal conductivity.     

水雷声引信系统海试考核方法探讨

对水雷声引信系统海上试验的考核方法进行了探讨,重点介绍了战技指标的概念和定义,并针对主要指标要求,分别详细介绍了考核评判标准。     

Effect of Drying on Particle Size and Sensitivities of Nano hexahydro-l,3,5-trinitro-l,3,5-triazine

Nano hexahydro-l,3,5-trinitro-l,3,5-triazine （RDX） was prepared using a bi-directional rotation mill and dried under different conditions （liquid, temperature and drying）. It shows that the samples cake seriously and the particles grow up obviously by ordinary drying in different liquids at 70 ℃, which occurs again after vacuum drying. With the increase of temperature, the degrees of caking and aggregation are enhanced. Well dispersed sample maintaining constant particle size is extracted by supercritical drying, especially freeze drying. Furthermore, the me- chanical sensitivities of I-RDX, O-RDX and F-RDX, of which the average sizes are 88.03 μm, 15.32 μm and 0.16 μm, respectively, are evaluated. Compared with I-RDX, the friction, impact and shock sensitivities of O-RDX are slightly lower. However, the friction, impact and shock sensitivities of F-RDX are reduced by 30%, 99.0% and 59.9%, respectively.     

飞机投弹出舱过程自动记录装置

介绍一种飞机投弹出舱过程自动记录装置。该装置没有对飞机的机械接口和电气接口进行任何改变,只需利用飞机现有挂弹架的挂弹钩接口安装设备,通过光敏开关感应光线强弱变化,判断飞机武器舱门是否打开,从而自动触发高速摄像机拍摄,完成飞机投弹出舱过程的记录任务。     

Biocompatible electrospun tactic poly(methyl methacrylate) blend fibers

Uniform and beads free fibers of pristine syndiotactic PMMA (s-PMMA), isotactic PMMA (i-PMMA), and their blends in the ratio of s:i = 3:1, 1:1 and 1:3 were successfully prepared using the electrospinning technique. The tactic PMMA blend fibers showed unique thermal stability and glass transition temperatures compared to their pristine counterparts. An interesting endotherm peak was observed for the s:i = 1:3 electrospun fibers, which might indicate a complex formation between the two tactic PMMAs. Systematic surface functionalities study by attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) revealed the interactions between these two tactic PMMAs. Biocompatibility of tactic PMMA and their blend fibers was first time comparably investigated using HeLa as the model mammalian cell line; an intriguing observance was first revealed that the blend fibers showed better biocompatibility than both pristine ones, though the behind mechanism is not well understood yet.