世界钼市场

本文评述了1992年的世界钼市场。     

面向电源噪声的动态电流测试

电源噪声在深亚微米设计中正变得越来越突出，而因电源噪声引起的电路故障测试也变得越来越重要。本文针对这一情况提出了动态电流测试来实现由电源噪声引起的故障测试。与IddQ测试不同，动态电流测试依据电路中的器件切换时电源电流的动态变化情况来判断电路中是否存在故障。通过仿真分析，动态电流测试是可行的。     

一种低待机功耗开关电源充电器的设计

简要介绍了安森美半导体(ONSEMI)公司开发的一款可变关断时间开关电源控制器NCP1215的主要特点和内部结构，给出了选用NCP1215控制器设计的一种极低待机功耗的开关电源充电器的实际电路。     

万家寨引黄供水区的农业灌溉问题分析

万家寨引黄工程主要为大同市、平朔区、太原市提供工业用水。对农业，计划将原被工业挤占的当地水资源量归还农业灌溉。本文通过分析三个供水区农田灌溉及当地水资源现状，以及对各供水区进行水量平衡分析和经济效益分析，论证了归还后所增加的农业灌溉水量的经济效益是显著的，该项农业供水计划是可行的。     

Economic viability assessment of sustainable hydrogen production,storage, and utilisation technologies integrated into on- and off-grid micro-grids: A performance comparison of different meta-heuristics

In recent years, there has been considerable interest in the development of zero-emissions, sustainable energy systems utilising the potential of hydrogen energy technologies. However, the improper long-term economic assessment of costs and consequences of such hydrogen-based renewable energy systems has hindered the transition to the so-called hydrogen economy in many cases. One of the main reasons for this is the inefficiency of the optimization techniques employed to estimate the whole-life costs of such systems. Owing to the highly nonlinear and non-convex nature of the life-cycle cost optimization problems of sustainable energy systems using hydrogen as an energy carrier, meta-heuristic optimization techniques must be utilised to solve them. To this end, using a specifically developed artificial intelligence-based micro-grid capacity planning method, this paper examines the performances of twenty meta-heuristics in solving the optimal design problems of three conceptualised hydrogen-based micro-grids, as test-case systems. Accordingly, the obtained numeric simulation results using MATLAB indicate that some of the newly introduced meta-heuristics can play a key role in facilitating the successful, cost-effective development and implementation of hydrogen supply chain models. Notably, the moth-flame optimization algorithm is found capable of reducing the life-cycle costs of micro-grids by up to 6.5% as compared to the dragonfly algorithm.     

国际石油价格风险对上海石油供应安全的影响

上海是能源资源贫乏的城市,所需石油几乎全部依靠外部调入。因此,国际石油市场对上海石油供应安全的影响至关重要。通过对国际市场石油价格变化的历史资料分析,建立了油价波动分析模型,定量分析了不同价格波动幅度对上海石油供应安全的影响。     

低碳经济浪潮下企业的供应链碳管理方法研究

在世界各国纷纷出台相关政策措施大力发展低碳经济的大环境下,气候变化及低碳发展已成为企业发展面临的最重要的问题,其中的核心是供应链管理,供应链碳管理与产品竞争力的关联越来越受到企业的重视.该文在简要介绍供应链碳管理特点的基础上对其关键步驟进行了解释说明,为企业开展供应链碳管理提供借鉴作用.     

Multi-state techno-economic model for optimal dispatch of grid connected hydrogen electrolysis systems operating under dynamic conditions

The production of hydrogen through water electrolysis is a promising pathway to decarbonize the energy sector. This paper presents a techno-economic model of electrolysis plants based on multiple states of operation: production, hot standby and idle. The model enables the calculation of the optimal hourly dispatch of electrolyzers to produce hydrogen for different end uses. This model has been tested with real data from an existing installation and compared with a simpler electrolyzer model that is based on two states. The results indicate that an operational strategy that considers the multi-state model leads to a decrease in final hydrogen production costs. These reduced costs will benefit businesses, especially while electrolysis plants grow in size to accommodate further increases in demand.     

柴油机噪声的控制

本文通过对柴油机主要噪声:排气噪声、燃烧噪声和的机械噪声的分析,结合实际工作中采取的有关降噪方法,提出控制和降低柴油机噪声的方法、措施,阐述控制和降低柴油机噪声的可行性。     

YC6108ZQ车用柴油机燃油系统适应性研究

在YC6108ZQ车用柴油机产品试制和配套试肜中，对发动机燃油系统中存在的问题进行了分析研究，通过改进燃油泵的供油性能和改进调速器特性，配合选用相适用的增压器，使发动机的使用性能有较大改善，得到较满意的研究结果。