三相对称系统中SVC-MERS注入谐波电流分析

磁能恢复开关MERS(magnetic energy recovery switch)是一种新型的无功补偿装置,它相较于其他无功补偿装置,具有结构简单、易于控制和损耗低等诸多优点,但在进行无功功率补偿的过程中会产生谐波电流。首先,在对MERS的结构和控制方法阐述的基础上建立了三相对称系统中SVC-MERS的数学模型,讨论分析了控制参数对三相对称系统中线电流谐波特性的影响;进而提出了控制参数的优化设计方法。仿真和实验结果表明,通过控制参数的优化设计可以有效地减小三相对称系统中线电流的谐波含量,所提控制参数的优化设计方法是可行的。     

重庆大学城实验资源共享机制研究

阐述大学城各高校实验资源共享的基本内涵和实现实验资源共享的必要性,分析目前的共事状况与存在的主要问题,并尝试提出相应的对策建议.     

多联式热泵驱动热管复合供热装置的实验研究

本文提出多联式热泵驱动热管的新型供热循环方式。该方式的特征是采用空气源热泵直接驱动串联式热管散热器供热。为验证该供热方式可行性,本文基于额定功率为2.5 kW的压缩机和9台热管散热器搭建了实验台,在不同工况下进行测试。测试结果表明：新型供热装置启动速度较快,当室外温度为-10 ℃时,系统运行36 min时,热管散热器表面温度即可达到45 ℃。热管散热器温度均匀性好,除1#、9#散热器存在过冷、过热现象外,其余散热器之间温差约为1 ℃。同时系统传热温差小,并能在除霜工况下正常运行。     

Bidirectional Targeted Therapy Enables Efficient,Stable, and Eco-Friendly Perovskite Solar Cells

Perovskite solar cells (PSCs) have witnessed rapid development toward commercialization based on their superior efficiency except for some remained misgivings about their poor stability primarily originating from interfacial problems. Robust back interface for neutralization of crystal defects, depression of dopant lithium ions (Li⁺) diffusion, and even inhibition of toxic lead (Pb) leakage is highly desirable; however, it remains a great challenge. Herein, a cost-effective interfacial therapy approach is developed to simultaneously alleviate the obstacles aforementioned. A small molecule, 1,4-dithiane with unique chair structure, is adapted to interact with under-coordinated Pb²⁺ on perovskite surface and Li⁺ from hole transport layer, neutralizing interfacial defects and suppressing Li⁺ diffusion. Besides, the presence of 1,4-dithiane can efficiently modulate interfacial energetics, enhance hydrophobicity of PSCs, and anchor Pb atoms via S Pb bond. Consequently, the target devices perform better than control devices when exposed to light-soaking, moisture, and thermal stress owing to the synergistic suppression of trap-state density, ions migration, and moisture permeation. The optimized target device delivers a champion efficiency of 23.27% with mitigated Pb leakage. This study demonstrates a promising functionalized modification strategy for constructing efficient, stable, and eco-friendly PSCs.     

美“海上一体化防空火控”体系发展及对抗思路分析

美国海军在“网络中心战”思想指导下,提出建设“海上一体化防空火控”体系（Naval Integrated Fire Control-Counter Air,NIFC-CA）,目前已完成海上杀伤链的部署。NIFC-CA较现有综合防空系统性能有极大提升,对传统的空中电子进攻体系带来新挑战。在简要介绍NIFC-CA项目背景、体系组成与功能、典型作战场景和发展方向基础上,从四个方面提出了针对NIFC-CA的体系对抗思路。     

软件密集型系统的故障诊断技术研究

在软件密集型系统发生故障时缺乏系统、规范的诊断方法,严重影响软件密集型系统的质量。以大量研究为基础,提出基于软件黑匣子的集成软件故障诊断模型,利用UML的扩展机制,采用"4+1"视图模型方法构建模型的体系结构框架,在Visual C++6.0环境中开发了它的原型系统。最后给出两个验证的应用实例,证明该技术路线是行之有效的。     

AZM-LEACH:一种分区自治的多跳路由协议机制

能量高效的多跳路由算法对延长无线传感器网络生命周期具有重要意义。在深入研究LEACH协议的基础上,提出一种均衡节点能耗的分区自治多跳路由改进协议AZM-LEACH。其核心思想是避免离汇聚节点较远的节点与汇聚节点直接通信,从而延长网络生存时间。通过仿真的方法对AZM-LEACH算法进行性能分析与评价。结果表明,AZM-LEACH算法在延长网络生命周期和减少能量消耗方面比LEACH算法有了明显的改善。     

A General “In Situ Etch-Adsorption-Phosphatization” Strategy for the Fabrication of Metal Phosphides/Hollow Carbon Composite for High Performance Liquid/Flexible Zn–Air Batteries

Benefiting from the admirable energy density (1086 Wh kg⁻¹), overwhelming security, and low environmental impact, rechargeable zinc–air batteries (ZABs) are deemed to be attractive candidates for lithium-ion batteries. The exploration of novel oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) bifunctional catalysts is the key to promoting the development of zinc–air batteries. Transitional metal phosphides (TMPs) especially Fe-based TMPs are deemed to be a rational type of catalyst, however, their catalytic performance still needs to be further improved. Considering Fe (heme) and Cu (copper terminal oxidases) are nature's options for ORR catalysis in many forms of life from bacteria to humans. Herein, a general “in situ etch-adsorption-phosphatization” strategy is designed for the fabrication of hollow FeP/Fe₂P/Cu₃P-N, P codoped carbon (Fe P/Cu₃P-NPC) catalyst as the cathode of liquid and flexible ZABs. The liquid ZABs manifest a high peak power density of 158.5 mW cm⁻² and outstanding long-term cycling performance (≈1100 cycles at 2 mA cm⁻²). Similarly, the flexible ZABs deliver superior cycling stability of 81 h at 2 mA cm⁻² without bending and 26 h with different bending angles.