基于优化算法的输电线路路径研究

基于优化算法的输电线路路径选择,考虑影响输电线路路径选择的环境因素,建立禁忌算法流程,通过环境因素分析以及科学依据确定各环境因素在输电线路路径选择中的权重,建立全寿命周期成本单元格,应用仿真软件Matlab编写禁忌搜索算法,生成最优路径。通过算法分析证明应用禁忌搜索算法进行路径选择有效可行。     

一起换流变压器绝缘油氢气异常分析

通过对一台换流变压器“氢气异常”的原因进行查找分析,发现是由于在线油色谱监测装置的载气进入变压器内部所致,针对这一问题提出了在线油色谱监测装置的工艺改进建议。     

动态风荷载对输电导线位移的影响分析

风荷载对输电线路影响颇为广泛,输电线路架设为了减少风害影响,通常只考虑静态风荷载,不能准确反映风荷载对线路的影响。以某供电局500 kV线路风动实验数据为基础,研究不同风速,不同角度下风载对输电导线位移的影响,得出了动态风荷载下输电导线的位移变化情况。本研究成果可为输电线路防风设计、事故分析和防风校核等提供参考,对于深入风荷载在输电线路方面的研究具有重要意义。     

基于加权磨煤机组合工况的喷氨格栅调整方法研究

从已投运的燃煤机组SCR脱硝系统的实际运行情况看,SCR脱硝系统在运行过程中存在共性问题,如脱硝反应器出口与烟囱排放口的在线监测值相差较大、脱硝出口氨逃逸超标、两侧喷氨量实际值偏离计算值等。脱硝系统内浓度场不均是造成上述问题的主要原因之一,采取针对性喷氨方式是改进脱硝系统运行的有效手段。针对机组运行实际,开展一种基于加权磨煤机组合工况的喷氨格栅调整方法研究。研究结果显示,该方法可在不增加测试仪表、不对喷氨手动阀进行改造的前提下,实现各种变动工况的NOX有效控制。     

Cobalt-Encapsulated in Nitrogen-Doped Carbon Nanotubes Prepared by Hydrothermal Method as Catalyst for Hydrogen Evolution

Abstract

Cobalt-encapsulated in nitrogen-doped carbon nanotubes (Co-NCNT) were prepared by hydrothermal method. CoCl₂·6H₂O and graphitic carbon nitride (g-C₃N₄) were used as raw material. Samples containing such defective structures were synthesized by hydrothermal methods, while there is an excellent synergistic effect between cobalt nanoparticles and carbon nanotubes on hydrogen evolution reaction (HER). In order to improving the HER performance, different samples were fabricated by changing the molar ratio of raw materials and pyrolysis temperature. The results show that Co-NCNT has the best HER performances at the ratio of CoCl₂·6H₂O and g-C₃N₄ (1:7) when the pyrolysis temperature reached 700?°C. The overpotential has reached 285?mV when the current density is 10?mA·cm^?2, the Tafel slope of the sample is 103?mV·dec^?1.     

Studies about Microstructures and Mechanical Properties of Ti(C,N) Ceramic Material Using Different Solvents

Abstract

Ti(C,N) ceramic materail plays an important role in the field of material processing due to their good mechanical properties and thermal stability. In this experiment, Ti(C,N) powders were successfully prepared by solvothermal and high-temperature calcining method, using TiOSO₄ and C₃H₆N₆ as raw material, and n-propanol and ethylene glycol as solvents. The microstructure of Ti(C,N) powders were characterized by X-ray diffraction and field emission scanning electron microscope, and their hardness were tested by vickers microhardness tester. The microstructure and mechanical properties of Ti(C,N) powders using two different solvents were investigated comparatively. Ti(C,N) powders prepared using n-propanol with a size of about 20–30?μm can reach the maximum hardness of 660 HV after sintering. Ti(C,N) powders prepared using ethylene glycol with size range of 3?μm to 5?μm come up to the maximum hardness of 889 HV. The different mechanism of solvents in preparation of Ti(C,N) ceramic material was discussed.     

一种考虑多种保障因素的作战任务间歇期战备完好率评估模型

科学合理的战备完好性评估对于准确掌握部队实战能力,优化保障体系结构,提高装备作战能力与保障效能具有重要意义。针对现有评估模型注重维修保障因素而忽略供应保障因素、无法处理结构和状态较复杂的装备体系与保障体系问题,提出一种新的综合考虑多种保障因素的作战任务间歇期战备完好率评估模型。分析装备体系与保障体系之间的交互关系和保障过程,从装备保障需求角度出发构建装备体系中单个装备作战单元的战备完好率评估模型,在此基础上进一步构建共享同一保障体系多个装备作战单元的战备完好率评估模型。该模型考虑了装备作战单元装备保障需求相同与不同两种情况,并针对模型求解时装备体系状态难以确定的问题,给出一种基于向量通用函数的装备体系状态确定方法。通过实例分析验证了所提模型定量评估战备完好率的有效性和优越性。     

复合装药威力性能试验分析

为研究复合装药威力性能,设计由高爆速理想炸药和含铝炸药组成的内外复合装药结构.在分析复合装药作用原理的基础上,采用压力传感器法研究不同装药结构的冲击波超压性能,利用靶网测速法研究不同装药结构对破片初速的影响.试验结果表明:相对于单一含铝炸药,外层高爆速炸药、内层由含铝炸药组成的复合装药结构可显著提高冲击波超压值和破片初速.     

风洞流场控制系统规范化研究与应用

为不断提高风洞试验能力、减少风洞建设成本,对风洞流场控制系统的规范化进行研究.分析目前中国空气动力研究与发展中心高速所测控系统规范化建设情况,阐述进行风洞流场控制系统规范化的必要性,重点对软件的规范化进行分析,主要开展软件结构分层、主要被控参数控制方法和复杂流程实现等方面的探索和设计,并对下一步工作提出展望.研究结果表明:规范化的风洞流场控制系统具有功能完善、结构清晰、适应性强等优点,可为今后相关系统的研发提供借鉴.     

Modeling the flow behavior of a simulated municipal solid waste

Flow slides in the municipal solid waste (MSW) landfill are common geological disasters that have the potential to cause loss of life, destruction of property, and damage to the natural environment in the surrounding region. In this work, a mixture of peat, kaolin clay and quartz sand was used as a model test material to simulate MSW. A series of physical model tests on MSW simulant flows was carried out to capture the run-out behavior of the waste and analyze its mobility. The testing assembly consisted of a transparent model box, a steel frame and a high-speed camera. Flow failure was induced by lifting up a baffle to cause the MSW simulant to collapse and flow. Images of the flowing mass were taken by the high-speed camera. The series of images clearly displays the propagation of MSW simulant flows. The final profile of the MSW simulant and the shape of the deposition area were observed and measured. The run-out distances, final deposit shapes, flow depth, velocities and angle of reach showed significant variation between test configurations, indicating the strong influence of moisture content on overall mobility. The test results obtained can aid in the prediction of distal reach, flow depth and maximum velocity of solid waste following a landfill slope failure, which are necessary for hazard assessment and mitigation planning, and also to provide physical data for theoretical and numerical model verification.