首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   12篇
  完全免费   1篇
  工业经济   13篇
  2016年   1篇
  2013年   2篇
  2011年   4篇
  2010年   3篇
  2009年   1篇
  2008年   2篇
排序方式: 共有13条查询结果,搜索用时 131 毫秒
1.
发电设备利用小时数变化的影响因素及变化趋势分析   总被引:5,自引:4,他引:1  
从1978-2008年我国发电设备利用小时数的统计数据,分析影响发电设备利用小时数的主要因素,认为发电设备利用小时数与GDP、发电装机增速等因素相关。对于我国发电小时数变动趋势、影响因素以及国际比较等方面的特点与规律进行了解析,并对规避投资风险、提高电力行业效率提出了建议。  相似文献
2.
风力发电机组性能考核方法探讨   总被引:2,自引:1,他引:1  
张瑞君 《电力技术经济》2011,23(11):70-72,77
功率曲线和可利用率2项指标可在总体上表征风电机组的经济和技术性能。通过对风电机组功率曲线和可利用率计算方法的分析,提出了一套实用性较强的风电机纽性能考核办法,以期为风电机组运行效果评价提供理论依据。  相似文献
3.
Positive outcomes for buyers and sellers occur when the partners readily make their resources available and integrate those resources in a beneficial relationship. This research investigates how salespeople facilitate the use of these buyer resources. Taking the seller's perspective, this study examines the effect that the salesperson's interaction activities, and the availability of buyer resources, have on relationship outcomes.  相似文献
4.
In adopting build-to-order order fulfillment systems, automotive companies strive to better synchronize their production output with market demand. This essentially gives rise to a new paradigm in production planning. Since all business is linked to customer orders, the operational performance is substantially determined by order-driven planning. Therefore, a clear understanding of the associated planning tasks, order promising and master production scheduling, as well as their dynamic interaction is essential. Based on the analysis of the decision situation of order-driven planning in build-to-order settings, we provide a framework comprising separate interlinked quantitative models for order promising and master production scheduling. The focus of the contribution is on the modeling and evaluation of both models in a dynamic setting. The approach is evaluated by means of a simulative analysis using empirical data from the automotive industry. Conclusions regarding the potentials of such systems with respect to customer service, the leveling of resource utilization, and holding are presented.  相似文献
5.
石油化工是能耗最大的工业之一。中国石化上海石油化工股份有限公司以中国石化集团公司下达的十一五节能指标为目标,依靠技术进步,挖掘节能潜力,优化原料和燃料结构,降低资源消耗,提升装置经济技术指标和能源利用率。2010年实现了万元产值综合能源消费1.311 t标煤,比2005年同期的1.706 t标煤下降23.15%,完成了十一五节能20%的目标。按照上海石化十二五发展规划,能源消费总量将达到13 M t标煤左右,必须进一步提高能源资源利用率,控制污染物排放总量,加快形成有利于节约资源和保护环境的生产模式,为发展低碳经济做出新贡献。  相似文献
6.
环境绩效评价的引入和推广使建筑业越来越关注其自身活动对环境的影响。迄今,学术界对环境绩效评价的研究成果显著,不仅基于自然环境、社会环境、经济环境的三角关系形成可持续性评价的研究领域,还基于项目全生命周期管理创立了全生命周期评价的理论体系。基于文献综述和问卷调查,设计出一套适用于建设项目的环境绩效指标,并分析各指标的数据可获得性、重要性及应受关注度,为国内建设项目更加科学地进行环境绩效评价提供了理论支持。  相似文献
7.
The only comprehensive published indicator of residential broadband availability in the US is number of providers in each ZIP code, as reported by the Federal Communications Commission (FCC). This measure has been widely used in academic and policy research to assess availability and to identify under-served areas, but it is acknowledged to be flawed and is often misinterpreted.  相似文献
8.
随着UPS电源系统的广泛应用,它的可靠性和可用性研究受到普遍关注。小客户大量使用的小型UPS电源结构简单、价格低廉,但过载设计上保护措施不够完善,使其使用寿命受到严重的限制。针对此问题,提出一种利用功率管安全工作区特性对功率MOSFET管进行过载保护的方法,且设计了保护电路,并对电路元件参数进行了理论计算。结果表明该电路结构简单,有较强的可移植性,可适用于大多数的逆变电路开关管的保护。  相似文献
9.
分析了1978年以来我国发电设备利用小时数的变化特点及影响因素,探讨了2009年发电设备利用小时数下降和电力供需偏紧共存的主要原因。发电设备利用小时的变化同电力需求增长、电源装机总量增长及其结构调整、网间交易电量增长、电网负荷特性等因素密切相关。随着市场竞争的不断激化、清洁能源的大力发展,拉动发电设备利用小时数上升和下降的因素并存,未来发电设备利用小时数仍将呈波动变化态势。对避免发电设备利用小时数大幅波动提出了相关建议  相似文献
10.
Inadequate intake of fruits and vegetables (F&V) is one of the leading causes of chronic diseases in the world. This study examined the patterns and determinants of F&V availability for human consumption in Latin American and Caribbean countries between 1991 and 2002. The results showed that there were considerable disparities between and within countries and only one-third of the sampled countries (if only 20% wastage is assumed) could achieve the World Health Organization’s recommendation of 146 kg of F&V intake/capita/year. The elasticities estimated from a fixed effect regression also showed that income, urbanization, price, and poverty were some of the important factors that affect the long-term availability of F&V.  相似文献
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号