Design and Implementation of Household Registration Management System under Fire Safety for Key Unit

近年来随着电力、信息、建筑等行业的不断发展，人们的生活和生产方式产生了巨大的变换，在信息化、自动化等方面有了显著提高，给我们的生活带来了极大的便利，但是问题也随之而来。消防安全逐渐成为人们的生活和工作中一项不可或缺的方面，消防安全问题作为人们生产生活中的重中之重，必须引起我们的高度重视，需要在合理利用科技发展带来的便利同时，努力做好安全保障工作。 目前，市面上有很多消防安全管理系统，其中一部分已投入到公安部门的消防安全管理工作中，但是由于受到开发成本不足、技术不成熟等问题的限制，那些相关系统仍具有功能不全，安全性、稳定性不好等诸多问题。鉴于以上种种问题，我们将通过合理的分析和设计，选择适宜的...In recent years, with the continuous development of power, information, and other industries, people's life and production created an enormous transformation, has increased significantly in information technology, automation, etc., to our lives has brought great convenience, but the problem has cropped up. Fire safety and people's lives gradually become an indispensable aspect of the work, fi...学位：工程硕士院系专业：软件学院_工程硕士(软件工程)学号：X201223056

第十八届美国理论与应用力学大会总结

1会议概况2018年6月5—9日,第18届美国理论与应用力学大会(18th U.S. National Congress of Theoretical and Applied Mechanics, USNCTAM2018)在美国芝加哥召开.本次大会由美国力学国家委员会和中国力学学会联合主办,旨在探讨和交流近四年世界范围内在理论和应用力学领域的基础研究、创新技术的最新进展,吸引了来自世界各地的近千名专家学

A theoretical analysis of the surface dependent binding, peeling and folding of graphene on single crystal copper

The binding, peeling and folding behavior of graphene on different surfaces of single crystal copper were examined theoretically. We show that the binding energy is the highest on the Cu(111), and follows the order of Cu(111) > (100) > (110) > (112). Conventional theory is capable of capturing the dynamic process of graphene peeling seen from molecular dynamics simulations. We show that the number of graphene layers on Cu surfaces could be distinguished by performing simple peeling tests. Further investigation of the folding/unfolding of graphene on Cu surfaces shows that Cu(111) favors the growth of monolayer graphene. These observations on the interaction between graphene with single crystal Cu surfaces might provide guidelines for improving graphene fabrication

中国式学科评估:问题与出路

今年四月份,教育部学位与研究生教育发展中心(以下简称"教育部学位中心")邀请全国学位授予单位参加全国第四轮一级学科整体水平评估。随之,各个高校展开了一场大规模、高级别的学科评估申报及材料提交总动员。第四轮学科评估自发布起也引发了学界的广泛关注和热烈讨论。高等教育是中国崛起的思想发动机,关涉民族复兴的未来,而学科评估是近年来中国高等教育学科建设成就的集中展示,其意义和影响可谓深远。为了更好推进学科评估科学进行,特别是促进高等教育健康发展,《探索与争鸣》编辑部邀请全国

选择性填充光子晶体光纤的高灵敏温度传感

为了研制具有更高灵敏特性的温度传感器,文章提出利用光子带隙效应,在PCF（光子晶体光纤）中选择性填充热敏液体实现高灵敏温度传感。应用全矢量平面波展开法计算光纤带隙,带隙及其宽度随温度规律性漂移。当在包层空气孔中选择不同位置和结构填充热敏液体时,发现仅填充内层空气孔时,带隙随温度漂移造成的变化率最大。当在包层第一层空气孔中填充热敏液体,晶格周期Λ=9μm,空气填充率分别选取d/Λ=0.9和d/Λ=0.5时,带隙边界波长检测和带隙宽度检测的温度灵敏度分别可达到22.07和7.01nm/℃,具有精确度高和系统结构简单的优点

光子晶体光纤的中红外超连续谱的产生与控制

设计了一种低损耗高非线性的碲化物PCF（光子晶体光纤）。采用分布傅里叶算法求解非线性薛定谔方程,数值模拟了基于PCF的中红外波段SC（超连续谱）的产生与控制。分析了PCF参量及泵浦光源参数对SC的影响,得出SC宽度和平坦度随PCF长度、色散参量以及泵浦脉冲峰值功率、初始宽度的变化规律。仿真结果表明,中心波长为2μm、脉冲峰值功率为20kW、脉冲宽度为100fs的泵浦光在PCF中传输15cm时,SC谱宽可达1 3303 450nm,且具有良好的平坦度

新型抗弯曲单模光子晶体光纤的研究

文章提出了一种对称结构的新型抗弯曲单模光子晶体光纤,采用全矢量有限元法分析了该光纤的单模特性及弯曲特性。在1 550nm波长处,光纤处于单模运转;当弯曲半径为5mm时,弯曲损耗仅为8.73×10-5 dB/圈;最小弯曲半径可达4.5mm,此时弯曲损耗为2.38×10-4 dB/圈;且无论光纤弯曲与否,其在1 550nm波长处的模场面积均约为61μm2,色散系数约为11.13ps/（nm·km）,与普通单模光纤相匹配

Tunable band structures of polycrystalline graphene by external and mismatch strains

Lacking a band gap largely limits the application of graphene in electronic devices. Previous study shows that grain boundaries (GBs) in polycrystalline graphene can dramatically alter the electrical properties of graphene. Here, we investigate the band structure of polycrystalline graphene tuned by externally imposed strains and intrinsic mismatch strains at the GB by density functional theory (DFT) calculations. We found that graphene with symmetrical GBs typically has zero band gap even with large uniaxial and biaxial strain. However, some particular asymmetrical GBs can open a band gap in graphene and their band structures can be substantially tuned by external strains. A maximum band gap about 0.19 eV was observed in matched-armchair GB (5, 5) | (3, 7) with a misorientation of θ=13 when the applied uniaxial strain increases to 9%. Although mismatch strain is inevitable in asymmetrical GBs, it has a small influence on the band gap of polycrystalline graphene