锯片制造车间设施规划浅析

分析了锯片制造业中因设施规划不合理,导致物料搬运成本上升的问题,依据设施规划的原则对锯片车间的重新布局方式作了系统的阐述,并提出了三种规划方案。     

汽轮机的运行和故障分析

企业的经营生产离不开电力的供应,而现阶段我国的电力供应依靠发电厂供电,通过汽轮机等一系列机械设备来产生电能。就目前的情形来看,为了保证我国更好地发展,还需要加强对电力设备的保障,而汽轮机则是其中的重要环节。     

Technological change in energy systems: Learning curves, logistic curves and input-output coefficients

Learning curves have recently been widely adopted in climate-economy models to incorporate endogenous change of energy technologies, replacing the conventional assumption of an autonomous energy efficiency improvement. However, there has been little consideration of the credibility of the learning curve. The current trend that many important energy and climate change policy analyses rely on the learning curve means that it is of great importance to critically examine the basis for learning curves. Here, we analyse the use of learning curves in energy technology, usually implemented as a simple power function. We find that the learning curve cannot separate the effects of price and technological change, cannot reflect continuous and qualitative change of both conventional and emerging energy technologies, cannot help to determine the time paths of technological investment, and misses the central role of R&D activity in driving technological change. We argue that a logistic curve of improving performance modified to include R&D activity as a driving variable can better describe the cost reductions in energy technologies. Furthermore, we demonstrate that the top-down Leontief technology can incorporate the bottom-up technologies that improve along either the learning curve or the logistic curve, through changing input-output coefficients. An application to UK wind power illustrates that the logistic curve fits the observed data better and implies greater potential for cost reduction than the learning curve does.     

50D/144F涤纶POY扁平丝生产工艺

在熔体直纺环吹风冷却工艺路线上,使用“—”型喷丝板,设置缓和的冷却条件,适当的无风区高度,纺丝温度及纺丝速度,开发生产50D/144F扁平丝。     

论小型冷热电联产

介绍了小型冷热电联产系统的特点和主要设备的现状.阐述了如何在西气东输的前提下,大力发展以小型、清洁冷热电联产为代表的第二代能源系统,促进国民经济的发展.     

关于中国风电发展的思考

对我国风电发展目标、风电设备国产化及制造产业的发展时机、风电市场培育以及其他事关我国风电发展的相关问题进行了分析和思考,供关注我国风电发展的社会各界参考.     

我国风电设备制造业的现状和发展前景

对国内外风力发电的现状进行了总结,然后对国内外风电设备制造业的现状作了详细的分析,指出我国风电设备制造业要想尽快实现大中型风电设备国产化,降低风电电价,就必须准确把握当今风电设备的发展趋势,准确选型,积极购买或引进专利技术,逐步实现固产化,最终形成产品系列自主开发的能力。最后指出了当今风电机组设备的主流和发展趋势,并作了一些比较。     

民营资本的进入对我国风电产业发展的影响——基于断点回归的分析

为克服单差法存在变量内生性，倍差法对于控制组的严格要求往往无法得到满足，故文中采用断点回归的分析方法，在无对照组的情形下，对我国风电产业2012~2015年的资产总计、主营业务收入以及发明专利数月度数据进行实证研究，探究民营资本的进入对我国风电产业的影响。实证结果表明，从短期看，民营资本的进入对我国风电产业规模与技术效率具有统计上的显著正面作用，具有一定的经济意义；另外，这一机制的推行对产业创新产生了显著的负面作用。     

汽轮机密封技术的应用与发展

在汽轮机上有个很重要的部件就是汽封,汽封主要起到密封的作用,其密封能力的好坏影响到蒸汽是否泄露,而蒸汽为汽轮机提供动力,因此其密封性能的高低会影响到汽轮机获得动能的大小。本篇文章就是对汽轮机的密封技术进行探讨。     

Public acceptance of and heterogeneity in behavioral beach trip responses to offshore wind farm development in Catalonia (Spain)

A combined travel cost – contingent behaviour survey of residents and tourists in Catalonia is conducted on-site to examine the effects on beach recreational demand of developing an offshore wind farm (OWF) project. The survey considers four potential OWF scenarios with different degrees of visual impact. We allow for heterogeneity in trip preferences among individuals and control for on-site sampling through the use of a random parameters negative binomial (RPNB) model and a Multivariate Poisson log-normal (MPLN) model, respectively. The welfare measures derived from the RPNB model relate to the current beach users only, whereas those from the MPLN model refer to the general population of residents and tourists in Catalonia. The results show the importance of the specific place of location of the OWF project and how the installation of wind turbines would significantly decrease the demand for trips, depending on their degree of visual impacts, leading to a substantial welfare loss. However, the results also show that the project mainly would cause a displacement of trips to other beaches within Catalonia rather than outside Catalonia and that the welfare per trip measures generated by the RPNB and MPLN models substantially differ. Policy implications of these findings are discussed.