Q420十字组合截面角钢轴压稳定性能试验研究

该文开展了Q 420十字组合截面角钢轴压试验研究组合角钢的稳定承载力性能.试验角钢规格分别为:L125×8、L140×12和L160×10,长细比为30～60,采用焊接十字填板.试验结果表明,组合角钢试件发生整体弯曲并伴随明显的局部屈曲变形,分肢角钢受力不均匀,分肢角钢应力比范围为1.04～1.31.然后,建立组合角钢的简化数值分析模型,模拟试件的轴压受力特性,并将模拟结果与试验结果进行对比.最后,基于研究结果提出采用修正长细比计算组合角钢稳定承载力,根据修正长细比的计算承载力与试验结果吻合较好,建议在实际工程中推广使用.     

A Multilevel Recognition Model of Water Inrush Sources: A Case Study of the Zhaogezhuang Mining Area

Mine Water and the Environment - Discriminating water inrush sources efficiently and accurately is necessary to control water in coal mines. We combined the improved genetic algorithm (IGA) and...     

65 nm双阱CMOS静态随机存储器多位翻转微束及宽束实验研究

利用微束和宽束辐照装置分别对两款65 nm双阱CMOS静态随机存储器(SRAM)进行重离子垂直辐照实验，将多位翻转（multiple-cell upset, MCU）类型、位置、事件数与器件结构布局相结合对单粒子翻转（single-event upset, SEU）的截面、MCU机理进行深入分析。结果表明，微束束斑小且均匀性好，不存在离子入射外围电路的情况；NMOS晶体管引发的MCU与总SEU事件比值高达32%，NMOS晶体管间的电荷共享不可忽略；实验未测得PMOS晶体管引发的MCU，高密度阱接触能有效抑制PMOS晶体管间的电荷共享；减小晶体管漏极与N阱/P阱界面的间距能降低SRAM器件SEU发生概率；减小存储单元内同类晶体管漏极间距、增大存储单元间同类晶体管漏极间距，可减弱电荷共享，从而减小SRAM器件MCU发生概率。     

A secure rational quantum state sharing protocol

A novel rational protocol to share two arbitrary qubits among multiple parties is investigated in this paper. First, the protocol is presented, which is learned from Li et al.’s protocol. Second, the utility, security, correctness, fairness, Nash equilibrium, and Pareto optimality of our scheme are discussed in detail, where the utility, correctness, and fairness of rational quantum state sharing protocols are creatively given because the agent who recovers the state plays a different and more important role. Another important point is that assumptions about our protocol are more practical and suitable than existing protocols.     

核反应堆试验台架比例分析方法的发展和应用

比例分析方法为建立合理的反应堆安全系统缩比试验台架提供了理论基础。本文结合比例分析方法的发展，探讨了不同比例方法的特点，并总结了部分已有台架的比例设计概念及评价，为反应堆系统试验台架比例方法的选取提供了参考。结果表明，线性比例方法中的加速度比例项使其应用受到限制；功率-体积法是一种简单有效的比例方法，但瘦高台架的特点也使此方法存在不可避免的弱点；H2TS（HierarchicalTwo-TieredScaling）方法以PIRT（PhenomenaIdentificationRankingTable）表为基础，对系统中重要整体过程和局部过程均进行了比例分析，其发展的相似准则中含有流体物性比例项，为台架比例概念的发展提供了条件。我国将以H2TS方法为指导建立非能动堆芯冷却系统试验台架ACME。     

科学改进国家煤矿安全监察机构工作机制和管理体制的探讨

运用科学发展和改革创新理念,针对国家煤矿安全监察机构面临的机遇和挑战,认为当前应当调整工作职责与重心,体现国家监察权威;联合地方政府部门,提升履职能力与行政效力;改进机构管理体制,推进煤矿安全监察事业的科学发展.     

空气间隔器在司家营矿区爆破作业中的应用

阐述了空气间隔器的应用和特性及给矿山带来的巨大经济效益.实践表明,爆破应用间隔器,可大幅降低炸药消耗和大块率.     

Effects of tetrahedral amorphous carbon film deposited on dental cobalt–chromium alloys on bacterial adhesion

The dental cobalt–chromium alloys are an important biomaterial used in making artificial dentures. Bacterial adhesion to cobalt–chromium alloys usually results in severe complications such as periodontal infection, secondary caries, and denture stomatitis, which have severe adverse impacts on human health. Therefore, an effective method is needed to reduce the bacterial adhesion to dental cobalt–chromium alloys. The aim of this study was to investigate the effects of ta-C films deposited on a dental cobalt–chromium alloy on the adhesion of Streptococcus mutans (ATCC175), Actinomyces viscosus (ATCC19246) and Candida albicans (ATCC76615). A filtered cathodic vacuum arc (FCVA) technique was used to coat the cobalt–chromium alloy with a ta-C film. Atomic force microscopy (AFM), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) were used to analyze the surface characteristics of the coating. Surface roughness was detected. Surface free energy and its components were calculated by measuring the contact angle. The results showed that the maximum sp³ fraction was achieved at 200 V substrate bias voltage. Compared with uncoated specimens, the ta-C film coated specimens had a lower surface roughness, a higher surface energy and a higher hydrophilicity. Most importantly, the adhesion of the three tested bacterial strains to the ta-C film coated cobalt–chromium alloy was significantly decreased. These results showed that ta-C film surface treatment could significantly reduce the bacterial adhesion to dental cobalt–chromium alloys, suggesting the potential of ta-C film surface treatment in artificial denture applications.     

基于PLC和MGCS的天然有机垃圾处理机控制系统

介绍了天然有机垃圾处理机的工艺流程及控制要求,提出了以S7-200及MCGS为核心的控制系统,阐述了系统的硬件配置、软件设计及上下位机之间的通讯。实际生产应用表明,系统可靠,效果良好,人机界面功能友好。