摘要：Rechargeable lithium-oxygen(Li-O_(2))batteries have attracted wide attention due to their high energy ***,the sluggish cathode kinetics results in high overvoltage and poor cycling ***(Ru)-based electrocatalysts have been demonstrated to be promising cathode catalysts to promote oxygen evolution reaction(OER).It facilitates decomposition of lithium peroxide(Li_(2)O_(2))by adjusting Li_(2)O_(2) morphologies,which is due to the strong interaction between Ru-based catalyst and superoxide anion(O_(2)
)*** this review,the design strategies of Ru-based electrocatalysts are introduced to enhance their OER catalytic kinetics in Li-O_(2) *** configurations of Ru-based catalysts,including metal particles(Ru metal and alloys),single-atom catalysts,and Ru-loaded compounds with various substrates(carbon materials,metal oxides/sulfides),have been summarized to regulate the electronic structure and the matrix architecture of the Ru-based *** structure-property relationship of Ru-based catalysts is discussed for a better understanding of the Li_(2)O_(2) decomposition mechanism at the cathode ***,the challenges of Ru-based electrocatalysts are proposed for the future development of Li-O_(2) batteries.

摘要：The Accelerator Driven Sub-critical(ADS)system is a strategic plan to solve the nuclear waste problem for nuclear power plants in ***-energy particle accelerators and colliders contain long strings of superconducting devices,superconducting radio frequency cavities,and magnets,which may require cooling by 2 K superfluid helium(HeliumⅡ).2 K superfluid helium cryogenic system has become a research hot spot in the field of superconducting *** this study,the ADS Injector-I 2 K cryogenic system is examined in *** cryogenic system scheme design,key equipment,and technology design,such as the 2 K Joule–Thomson(J–T)heat exchanger and cryomodules CM1+CM2 design,are examined,in addition to the commissioning and operation of the cryogenic *** ADS Injector-I 2 K cryogenic system is the first 100 W superfluid helium system designed and built independently in *** ADS proton beam reached 10 Me V at 10 m A in July 2016 and 10 Me V at 2 m A in continuous mode in January 2017 and has been operated reliably for over 15,000 h,proving that the design of ADS Injector-I 2 K cryogenic system,the key equipment,and technology research are reasonable,reliable,and meet the *** research into key technologies provides valuable engineering experience that can be helpful for future projects such as CI-ADS(China Initiative Accelerator-Driven System),SHINE(Shanghai High Repetition Rate XFEL and Extreme Light Facility),PAPS(Platform of Advanced Photon Source Technology),and CEPC(Circular Electron-Positron Collider),thereby developing national expertise in the field of superfluid helium cryogenic systems.

摘要：针对直流变换器(DC/DC)中变压器绕组之间的高压绝缘问题,提出采用高压电缆作为同轴变压器绕组的绝缘方法和该种同轴变压器的优化设计方法.考虑直流风电场的实际情况,对应用于模块化隔离型DC/DC变换器的中频同轴变压器进行设计,对变压器的结构和参数优化进行研究,得出变压器优化设计的最优解.在仿真实验中,利用Ansys软件进行变压器的温度场仿真.以额定容量250kV·A的中频同轴变压器为例,进行优化设计.结果表明:变压器体积为0.022 3m3,重量为47.11kg,变压器满载时的最高温度为98.5℃,励磁电感和泄漏电感值均满足设计要求,验证了同轴变压器设计方法的有效性和可行性.

摘要：以单个子模块为出发点,分析死区对模块化多电平换流器(MMC)相单元总电压以及交流输出电压的影响.分析表明:在死区时间内,MMC相单元中实际处于投入状态的子模块总数与该相单元内部某一采样时刻发生投、切状态改变的子模块数相关,从而导致相单元总电压会出现短暂的过压(或欠压),不利于桥臂电抗器的运行,同时使MMC交流输出电压中出现不期望的电平数,增大了输出电压的总谐波畸变率.利用优化的均压算法减小了死区对MMC的影响,提高了输出电压的质量,研究最近电平逼近以及优化的均压算法在实现过程中面临的问题.设计一种适合于大规模MMC的控制系统硬件平台,研发了41电平三相MMC实验室样机.实验结果表明:所设计的控制系统是可行的;优化后的均压策略有效地降低了死区对MMC相单元总电压、交流输出电压以及桥臂电抗器的影响.

摘要：液氦时间投影室(ALETHEIA)是一个原创的低质量(100 MeV/c^(2)—10 GeV/c^(2))暗物质探测装置.入射粒子在液氦时间投影室中与液氦发生相互作用会产生80 nm长的闪烁光.目前尚无商用光电读出器件可以直接高效读取该闪烁光.为此,需要波长迁移剂(wavelength shifter)先将其转换为可见光,然后再用商用光电读出器件探测之.在参考国际相关类似涂敷试验装置的基础上,利用改进的气相沉积法成功地在直径和高度均为10 cm的圆柱形聚四氟乙烯(PTFE)容器内壁涂敷1.50—3.02μm.厚的TPB(tetraphenyl butadiene, 1,1,4,4-四苯基-1,3-丁二烯)涂层.此工艺方法对其他需要在圆柱形探测器内壁涂敷TPB或者其他类似材料的试验具有参考价值.本文对TPB涂层的涂敷原理、盛放TPB粉末的源的设计、涂敷工艺、涂层厚度监测等方面进行阐述.

摘要：在对风景旅游建筑进行概念界定的基础上,引入风景旅游建筑与场地耦合的概念。首先利用耦合理论,建立风景旅游建筑与场地的耦合矩阵,运用层次分析法(AHP)建构目标层—指标层评价体系结构,采用专家评分法建立判断矩阵并计算相对权重,然后对各评价因子赋值,确定综合评价分值以及耦合度的计算方法。结合云南永子棋院的设计案例,对其进行耦合度评价的实际应用。研究结果表明:运用层次分析法建立风景旅游建筑与场地的耦合度评价体系能够有效降低风景旅游建筑对风景环境的破坏与影响,是对风景旅游建筑设计进行客观、科学评价的重要手段,但是如何摆脱该评价体系自身对于评价专家素养的过分依赖将成为未来研究的重要方向。

摘要：以橘林油脂酵母(Lipomyces kononenkoae CICC1714)为实验材料,通过设计单因素实验,确定了摇瓶发酵培养的最佳产油条件为:氮源为硫酸铵,碳源为葡萄糖,培养温度28℃,接种量10%,初始pH值为7.0,最适碳氮比为99。优化后批次发酵的生物量为7.01g/L,油脂含量15.91%,油脂产量1.12g/L。经半连续发酵后最终的生物量为24.13g/L,油脂产量为3.06g/L。

摘要：永磁无刷力矩电机零位校准直接影响电机的性能和控制精度,实现零位精确设计不仅能够提高产品设计效率,而且能有效降低电机转矩波动带来的振动、噪声等问题。本文研究永磁无刷力矩电机零位设计方法,提出了基于有限元精确设计永磁无刷力矩电机零位的方法,通过在ANSOFT Maxwell中建立电机的2D有限元模型,实现分装式无刷力矩电机的零位仿真和计算,确定样机零位位置。最后通过研制样机进行试验,验证该方法的有效性。方法的提出可实现无刷力矩电机的零位精确设计,可有效提升产品设计水平,具有一定的工程设计意义。

摘要：针对某教练机的设计要求,采用切割法生成襟翼外形。通过评估后缘襟翼外形对两段翼气动特性影响,确定合适的襟翼外形方案。并利用计算手段研究缝道量和重叠量对襟翼升力系数和表面压力系数的影响规律,结果表明,其襟翼方案满足设计要求。

摘要：Quattor软件启动节点机的PXE网卡远程安装节点机,根据节点机的环境和要安装的软件包、服务等来实现自动安装节点机,并通过用PAN语言编写以后缀名tpl结尾的模板文件来描述上述信息。针对一些Quattor系统管理员不熟悉模板编写的问题,该文设计Quattor模板自动生成系统,该系统能在远程使用支持HTTPS(SSL上的HTTP)协议的Web浏览器,通过Web界面使Quattor自动生成模板,可保证在安全性的前提下,提供简单深入的远程模板自动生成。