主成分分析模型在河北省农村第一产业电力消费预测研究中的应用

电力需求与经济发展密切相关,第一产业经济发展决定其电力需求。根据历年经济发展及电力需求状况找出第一产业国内生产总值和城市化率是决定第一产业电力需求的主要因素,采用主成分分析方法对河北省农村第一产业电力需求进行预测。     

Coal gasification for electric power generation

The electric utility industry is being severely affected by rapidly escalating gas and oil prices, restrictive environmental and licensing regulations, and an extremely tight money market. Integrated coal gasification combined cycle (IGCC) power plants have the potential to be economically competitive with present commercial coal-fired power plants while satisfying stringent emission control requirements. The current status of gasification technology is discussed and the critical importance of the 100-megawatt Cool Water IGCC demonstration program is emphasized.     

阜平县土地资源利用状况分析

采用土地经济学研究方法,从土地利用结构、土地利用程度和土地利用效益3个方面,对阜平县2003年土地资源利用状况进行了对比分析.结果表明:近20a来,阜平县林业生产有较大发展,土地利用结构日趋合理,与其土地自然性状和林业县定位基本相符,但居民点及工矿用地增长较快,新开垦耕地多数利用方式不尽合理;土地利用程度有较大提高,荒山开发利用及林业建设成效明显,森林覆盖率26.26%,但森林资源区域分布不均匀,保持水土与调节生态和气候的作用依然有限;土地利用的总体效益有一定提高,但单位效益指标较低,需进一步改善生产条件、增加科技投入,提高土地资源利用效益.     

拖拉机汽车发电机定子铁芯卷叠加工工艺试验研究初报

拖拉机汽车发电机定子铁心卷叠加工是近年来在国外出现的新工艺,它的材料利用率可提高1～3倍之多。从1980年开始,经过一段时间的摸索,我们已基本掌握了该工艺的技术关键。试验加工出的铁芯样品,各项电气性能均达到产品的要求;在采取一些措施之后,加工精度方面的不足也是能够克服的。可以认为,在国内,采用新工艺生产已经有现实的可能。     

南京市电力行业二氧化硫排放清单的建立及减排建议

该文在问卷调查和资料查阅的基础上,针对二氧化硫对南京市电力行业进行活动水平调研,采用"自下而上"的方法建立了南京市2014年电力行业二氧化硫排放清单。结果表明,2014年南京市电力行业二氧化硫排放总量为27 735.20t,该结果与2014年环境统计资料结果较吻合,证明该清单编制方法具有较强的可操作性和可信性。根据本研究所建立的二氧化硫排放清单,从改变能源结构、优化发电设备、优化脱硫设备、加强煤炭脱硫工作等方面提出了二氧化硫减排建议。     

高校教务信息网络传播初探

教学与教务管理工作是高校教育工作的一项重要内容,其中,教务信息对教务管理工作有相当的重要性。目前,网络传播已成为教务信息传播的主要方式之一。通过分析教务信息网络传播的现状,指出其传播特点。从传播媒介、传播者和传播环境3个方面提出了教务信息网络传播面临的一系列问题和对策,并且探讨了教务信息网络传播对于教学教务管理工作的重要意义。     

重庆市开县建设用地节约集约利用评价

通过对重庆开县近几年建设用地的详实数据进行分析,得出当前全县建设用地基本现状及各类建设用地几年来的变化情况;并根据开县经济社会发展要求,辅以建设用地二、三产业增加值等为参考指标体系,分析其建设用地节约集约利用水平提高的长期变化趋势;此外还分析了开县建设用地集约节约利用中存在的问题和原因,最后,提出促进开县建设用地节约和集约利用的对策建议.     

地方电力企业用电管理信息系统设计

近些年来电力行业发展迅速,地方电力企业纷纷建立了自己的用电管理信息系统,用来解决电力行业的发展需要。而如何通过新的信息技术使电力企业能够为用户提供更加优质高效的服务,提高企业经济效益,是当前电力企业用电管理信息系统建设的首要问题。本文介绍了采用面向对象的C.#和SQL Server 2000设计的用电管理信息系统,用以解决地方电力企业用电管理信息化的需要。     

Solar energy and electric utilities: should they be interfaced?

Analyses of the economics of solar collection in the firm- and shifting-peak cases (that is, with off-peak electricity indefinitely available or with a flat load curve) indicate that, for many important applications, solar energy systems that interface with electric utilities can be justified only in terms of the value of the off-peak utility fuels that they displace. In regions where off-peak electricity costs are low, the most economically efficient solar energy systems will be those that use electricity as the auxiliary energy source. This implies extremely low break-even costs for a number of important solar energy applications. In regions where the cost of off-peak electricity is higher than that of competing energy forms, the most economical solar energy systems will utilize auxiliary fuels other than electricity. The general conclusion is that conventional electric utility systems and most solar energy systems represent a poor technological match. The basic problem is that both technologies are very capital intensive. The electric utility, because of the high fixed costs of generation, transmission, and distribution capacity, represents a poor backup for solar energy systems. On the other hand, the solar collection system, because it represents pure, high-cost capital and because of its outage problems, cannot be considered as a part-load source of auxiliary energy for the electric utility system.     

废电器拆解业对农村社会经济环境影响的公众评价

通过对浙江省主要废电器拆解地--台州市路桥峰江地区的常住与暂住人口面对面的问卷调查,研究了废电器拆解业对农村社会经济环境的影响.结果表明,废电器拆解业一方面可对当地经济产生正面影响,如通过提供廉价原材料而带动当地塑料、轴承、机电、电线电缆、管道阀门等行业的发展;另一方面也会对当地的环境和村民健康产生一定的负面影响.综合分析表明,拆解业是一个不可持续发展的行业,但当地经济对拆解业仍有很大的依赖性.     

Solar photovoltaic power systems: will they reduce utility peaking requirements?

From an analysis of the long-run electric generating requirements of several representative utilities, it is concluded that the energy supplied by solar photovoltaic power devices will displace primarily base-load, and to a lesser extent intermediate, generating plants, even at relatively modest penetrations corresponding to several percent of the utility peak load. Attaching photovoltaic devices to the utility grid will not yield significant fuel oil savings over the long run, in which utilities approach the economic optimum generating mix, and will increase peak plant requirements. Utility capacity and fuel savings of photovoltaic devices are reported both for the case without storage and for the case in which the utility has access to load-leveling storage.     

Ethics panel faces the ax

The President's Commission for the Study of Ethical Problems in Medicine and Biomedical and Behavioral Research, scheduled to go out of business on 31 December 1982, requested a three-month extension of its life to complete several reports. This brief news item reports that the requested extension was added as an amendment to a budget bill by the Senate but then stripped from the bill by a House-Senate conference committee.     

Solar photovoltaic power systems: an electric utility R & d perspective

Solar photovoltaic technology is receiving increasing attention as a prospective source of bulk, electric utility power within the next 10 to 20 years. Successful development will require solar energy conversion efficiencies of about 15 percent for photovoltaic flat-plate modules, or about 25 percent for photovoltaic cells using highly concentrated sunlight. Three different cell technologies have a better than even chance of achieving these target efficiencies with costs and operating lifetimes that would allow significant use by electric utilities. The challenge for the next decade is to push photovoltaic technology to its physical limits while expanding markets and user confidence with currently available systems.     

陕西蔬果电动作业农机发展思考

陕西省果蔬种植面积较大,果蔬作物多样,但大多数是家庭或小农场种植模式,但南北地形地貌差异较大,传统大型机械作业不便且费用较高,通过适度规模的宜机化改造后,中小型马力的动农机可完全适用小区域化果蔬园,在山丘区果园及设施种植环境下中小型电动农机就有很大的发展前景,并且中小型电动农机具在提质增效、智能化提升及节能减排方面也有较为广阔的发展空间。     

中国畜牧业政策对养猪农户生产效用的影响

畜牧业政策对于中国生猪生产具有直接导向作用 ,虽然 ,在农业产业结构调整中 ,中国生猪生产量有明显下降 ,但是养猪业仍然在中国畜牧业生产中占有重要地位。鉴于中国生猪饲养量的 2 / 3仍然由农户生产 ,畜牧业政策对于正确引导和鼓励户饲养和朝向规模化方向发展具有重要作用。笔者通过对四川和山东两省养猪农户生产资料和技术服务获得的分析 ,研究了畜牧业政策对养猪农户生产和行为的影响 ,从一个方面反应了中国畜牧业政策对农户饲养生猪的效用     

ATT7022及其在交流模拟量采集中的应用

本文介绍了三相电能专用计量芯片ATT7022的原理、特点及其在交流模拟量采集中的应用。并给出了相应的硬件电路图。有很好的实用价值。     

细叶韭调味品的产业化初探

通过对细叶韭生产现状及开发利用价值的分析,对细叶韭调味品的产业化进行了探讨。结果表明：细叶韭作为新型调味品受到市场的青睐,但基本处于野生采收阶段。细叶韭作为新型调味品资源,对餐饮业和食品加工业具有不可替代的作用,对于特色产业的形成,具有重要意义。细叶韭属于劳动密集型产业,发展细叶韭产业,可安排大量农村剩余劳动力,为贫困山区的发展,注入新的活力,将资源优势转化为经济优势,促进区域经济的发展。应加大对细叶韭研究的投入,增加研究课题,加强基础研究,为细叶韭产业化奠定坚实的理论基础。     

Inferences of competence from faces predict election outcomes

We show that inferences of competence based solely on facial appearance predicted the outcomes of U.S. congressional elections better than chance (e.g., 68.8% of the Senate races in 2004) and also were linearly related to the margin of victory. These inferences were specific to competence and occurred within a 1-second exposure to the faces of the candidates. The findings suggest that rapid, unreflective trait inferences can contribute to voting choices, which are widely assumed to be based primarily on rational and deliberative considerations.     

基于层次分析法的安顺试验区主导产业选择

在比较国内外学者对主导产业的选择方法的基础上,选用层次分析法,以选择带动安顺试验区经济全面发展的主导产业为目标层,市场需求、效益准则和因地制宜为准则层,构建主导产业选择模型,对安顺试验区主导产业进行了选择。结果表明,安顺试验区主导产业选择的优先顺序应该是：旅游业〉制药工业〉交通运输业〉能源工业〉食品工业〉特色农业〉包装与印刷业〉汽车工业〉采矿工业〉机电工业。     

第七类进口废物拆解业的环境经济分析

第七类进口废物拆解业作为我国允许的废物回收利用行业,目前是浙江省台州市路桥区主要的支柱产业。采用费用-效益分析方法分析了第七类进口废物拆解业对当地乡镇的环境经济影响。结果表明,第七类进口废物拆解业对当地经济的发展起了不可忽略的作用,与当地其他行业相比,在一定时期内还应该予以适当发展。