基于关键技术合理规划地方新能源电动汽车产业发展

发展新能源电动汽车是解决能源和环境问题,实现汽车产业快速发展的有效途径,通过对电动汽车发展现状和关键技术的分析,明确了以纯电动汽车和混合动力汽车为主要发展目标,以电动机及其控制技术和动力电池及其管理技术为核心技术。结合河北省汽车产业发展现状,提出了多元化发展模式,建立基于关键技术的产业基地,实行高速电动汽车和低速电动汽车的差异化发展格局和优先有序发展低速电动汽车的产业发展规划,推进新能源汽车快速发展。     

电动汽车充电站电能质量与能耗分析研究应用

文章结合配电网负荷的特点以及不同类型充电机的充放电特性,分析了电动汽车充电站运行时对配电网运行产生的影响,并评估了不同原理、不同充电模式下的充电机能耗。利用Matlab/Simulink仿真平台建立电动汽车充电站仿真模型,考虑了三相整流、DC/DC变换器模块,并计及配电线路阻抗、配电变压器影响。为准确检测充电机不同充电方式时的谐波以及间谐波情况,提出一种新的FFT加窗插值和神经网络相结合的谐波与间谐波分析方法。文章在充电机建模完整性、谐波分析算法、充电机能耗和脉冲充电机电能计量误差等方面的研究成果,对制定合理的收费政策、充电机建设规划和选型、计量仪表合理配置,以及电动汽车充换电站安全运行具有指导意义。     

国外电动汽车技术发展趋势展望

近二十多年来，由于石油危机与环境污染相继发生，促进和加快了电动汽车技术的发展，世界各国对电动汽车技术进行开发研究的竞争，有以下的发展趋势和特点：1．各国政府积极参与，加快了发展的速度西方工业发达国家对电动汽车的研究开发，把社会效益放在第一位。首先着眼于解决环境问题和能源问题，把电动汽车的研究开发当成国家事业和政府行为，在经济上给予大力支持。美国政府拨巨资投入电动汽车开发研究、技术攻关和推广应用，美国总统克林顿亲自督促和协调通用、福特、克莱斯勒三大汽车公司发展电动汽车的计划。法国政府和国会也积极支…     

有序用电负荷管理实践

<正>实施有序用电负荷管理,能够优化负荷结构,保证社会稳定和经济发展。同时,负荷管理提高了电网负荷率,实现用电效率最大化,在深化优质服务的同时,实现社会效益和经济效益的双平衡。有序用电负荷管理是DSM的一项重要内容,在电网负荷紧张时,能够有效实现全社会有序、高效用电。国网山东电力胶州市供电公司(以下简称"胶州公司")在2008~2016年迎峰度夏、度冬期间,通过广     

电池专利的围困与突围

锂电池泛指用锂金属做正极,碳材料为负极的两次动力电池,相对而言其比能量、比功率性能优异,能大电流充放电,循环寿命较长。但锂电池有易爆的特点,故用于电动汽车的电池组除了有电池管理系统以外,其电池箱必须具防冲撞耐挤压的功能,一般用具有上述功能的钢材按耐压容器制造。由此使电池组最终的重量增加,比能量下降三分之一左右。     

打好安全运维“组合拳”

正今年夏季的高温天气使皖南地区全社会用电负荷连创新高。国网安徽省电力公司祁门县供电公司(以下简称"国网祁门供电公司")精心部署,沉着应对,通过狠抓调度负荷管理、设备隐患消缺、农网工程建设、应急抢修备战、服务客户等重点环节,全力确保祁门电网安全稳定运行,科学有序供电。全力攻坚电网运维科学有序7月上旬以来,国网祁门供电公司组织人员冒着高温天气对全县35千伏线路及县城配电设备进行了全面     

电动车动力蓄电池回收政策发布

正近日,国家发展改革委、工业和信息化部、环境保护部、商务部、质检总局联合发布《电动汽车动力蓄电池回收利用技术政策(2015年版)》(以下简称《技术政策》),引导电动汽车动力蓄电池有序回收利用,防止环境污染,促进资源循环利用。国家发展改革委有关负责人介绍,目前,我国电动汽车动力蓄电池保有量还比较少,相关回收利用体系还未有效建立起来,回收利用技术工艺还不成熟,暂不宜进行强制性管理。因此,《技术政策》只是一个引导性文件,没有作出惩     

电动汽车研究综述

电动汽车作为现代汽车产业发展的必然选择,学术界愈来愈重视对其开展研究。对近年来电动汽车的政策、研发车型、充电设施、关键技术、充电模式、充电影响及相关问题的对策等方面的研究进行了简要回顾和综述,并作了相应的总结与展望。     

实施精细化管理促进企业科学发展

精细化管理是适应现代企业管理需要,实现煤炭企业稳定健康发展的有效途径.近年来,韩城矿业公司对各个部门、每个人的岗位职责进行准确定位,对每个系统的各道工序和各个环节进行合理规范,建立起制衡有序、管理有责、高效运行的内部管理系统,同时,从全局角度出发对管理行为与结果进行控制考核.通过科学有序地推进精细化管理工作,提高了企业的整体管理水平,使企业发展能力逐步增强.     

法律层面上的"有序用电"

在有序用电活动中,供电企业具有特殊的地位和特定的职责。面对目前大范围、持续性的严重缺电形势,有必要从法律的角度对有序用电进行探讨,以明确相关的法律问题,促使供电企业正确行使权利和履行义务。用电管理权。有序用电首先涉及到用电管理权问题,对此需要明确以下两点:第一,谁有权对用电行为进行管理。电力法律、法规以及配套的规章确立了电力管理部门、发电企业、电网企业、供电企业和电力用户的不同主体性质,形成了较为完整的权利义务体系。《电力法》规定县级以上地方人民政府经济综合主管部门,是本行政区域内的电力管理部门。《电力…     

增强Linux系统安全性的措施

L inux系统的安全取决于系统管理员如何来管理它。本文探讨了一系列可以增强安全性的技巧与策略 ,包括 :系统安装原则、BIOS安全、口令安全策略、设计帐户自动注销功能、文件系统和日志安全策略、使用 SSH及 TCP-WRAPPERS,隐藏系统信息、删除所有特殊帐户、关闭控制台程序、限制系统中的 SUID/ SGID程序等。本文最后向 L inux系统管理员提出了一些安全管理方面的建议     

CIS与现代企业管理美学

概括性介绍了 ＣＩＳ（Ｃｏｒｐｏｒａｔｅ Ｉｄｅｎｔｉｔｙ Ｓｙｓｔｅｍ）的三大基本组成，并阐述了它与现代企业管理密不可分的相互联系及所处的举足轻重的地位，指出导入ＣＩＳ是现代企业谋求发展的重要手段。     

Comparing FTTH access networks based on P2P and PMP fibre topologies

There is an ongoing discussion in the market which Next Generation Access (NGA) architecture best suits future needs and which investment and cost differences exist. The discussion can be subsumed as P2P vs. GPON, which is somewhat misleading as this article reveals. The discussion is driven by the fact that the high capital cost and the long asset life time of fibre mean that the technology choices made today will dominate the opportunities for telecommunication business of all market players, incumbents, competitors, content providers and business and residential users for many years in the future.The paper analyzes the cost and other differences between Fibre-to-the-Home (FTTH) access network architectures and their related different wholesale approaches by using the well-known and understood steady state approach applied in other NGA analyses in the past. In addition to the steady state analysis a dynamic cost evaluation is included taking into account the different investment behaviour of the FTTH architectures over time. The results describe investment and cost differences between architectures, incumbents and wholesale based competitive operators. The analysis has been performed for different geotypes (clusters) of decreasing population density in a representative European settlement structure.     

Divergent patterns of engagement in Internet standardization: Japan,Korea and China

This article analyzes the engagement of Japanese, Korean and Chinese participants in the development of Internet standards at IETF on the basis of four quantitative metrics: attendance, patenting, authorship and leadership. The results are strikingly divergent. Japanese involvement in Internet standardization began early and Japan was, for many years, second only to the U.S. in terms of IETF participation. Though Japanese participation has declined since the early 2000s, Japan remains a major contributor to IETF standardization. Korean involvement in IETF has always been significant, but below the levels of Japan and major European countries. Korean participation in IETF has also declined over the past decade, and has been dominated by one firm, Samsung. Though meaningful Chinese involvement in IETF did not begin until the mid-2000s, it has rapidly expanded in recent years. Today, China is a major player in numerous areas of Internet standardization in terms of three metrics (participation, patenting and leadership), and is rapidly gaining in terms of document authorship as well. Most of China׳s recent IETF involvement can be attributed to Huawei, though other Chinese firms have recently begun to increase their participation in the organization. Thus, contrary to some views that China׳s engagement with standardization is primarily one of indigenous innovation and “catching up”, China׳s experience with IETF demonstrates deliberate and effective engagement with a major Western standards-development organization on its own terms.     

Whose Image is it Anyway?: Some Considerations of the Curricular Importance of Subject Image in Secondary School Design and Technology Education

This paper explores the idea that a sense of school subject image is a necessary feature of curriculum management and a potent force for change. The discussion centres on the view that all school subjects have an image and that if those intimately involved with the subject do not control the image then someone else does! In such circumstances the image is the product of past encounters and old euphemisms and is unlikely to hold the changed realities.The UK developments in Design and Technology education (the term Design and Technology is used to denote the school subject defined under this heading by the UK National Curriculum, 1995) have created something of an image problem which has interesting international parallels. Some of these problems are due to clearly discernible internal tensions and an ambiguous relationship with other subject areas.Through greater attention to subject image internal controversies might be acknowledged and resolved, relationships with other subject areas can be more meaningfully understood and practitioners can be helped to make sense of curriculum change.     

Indigenous peoples’ nutrition transition in a right to food perspective

In indigenous communities the nutrition transition characterized by a rapid westernization of diet and lifestyle is associated with rising prevalence of chronic disease. Field work and literature reviews from two different policy environments, Argentina (Jujuy) and Canada (Nunavut), identified factors that add to indigenous peoples’ disease risk. The analytical framework was the emerging human right to adequate food approach to policies and programmes. Indigenous peoples’ chronic disease risk tends to increase as a result of government policies that infringe on indigenous peoples’ livelihoods and territories, undermining their economic system, values and solidarity networks. Policies intended to increase food security, including food aid, may also fuel the nutrition transition. There is a need to explore further the connection between well-intended policies towards indigenous peoples and the development of chronic diseases, and to broaden the understanding of the role that different forms of discrimination play in the westernization of their lifestyles, values and food habits. Food policies that take due account of indigenous peoples’ human rights, including their right to enjoy their culture, may counteract the growth of chronic disease in these communities.     

Diffusion and usage of public e-services in Europe: An assessment of country level indicators and drivers

We analyze the state of the art of indicators on e-government, e-health, e-procurement and e-participation. We survey the main methodological properties of these indicators, and highlight their heuristic potential. Further, we address empirically the issue of the explanation of the availability scores, i.e. how the supply of the various e-services in each country is affected by political, institutional and socio-economic differences, and is followed by actual usage. The econometric analysis uncovers the importance of broadband penetration and higher education as drivers for most of the types of e-services and users (citizens and businesses). Moreover, a corruption-free and agile public sector proves to be an important pre-condition for more effective supply and usage. Despite data limitations and the complexity of the underlying diffusion phenomena, our study is the first truly longitudinal contribution aimed at disentangling the common drivers of such an important phenomenon – the e-services availability and usage across European countries. As such, this work appears useful to inform the policy debate and practice, in a phase characterized by a prospective reorientation of the public e-services provision and policy agenda.     

一种高精度的频率标准比对系统

频率标准源可以提供精确的标准频率,在测定频率标准源的各项性能指标时,要求测试系统必须具有很高的比对精度。所设计的频率标准比对系统采取多级倍频 混频方式使频率偏差逐级扩大后再测量,从而避免了直接进行高次倍频的困难,提高了测量精度,可以对高精度的频率标准的准确度、长短期频率稳定度进行快速测量,是一种高精度时畴参数测量系统。     

A strategic skill based model of supplier integration and its effect on supply management performance

Supplier integration is a tool to help organizations gain competitive advantage. Strategic supply management skills and the supply management function's perceived status are hypothesized as antecedents to supplier integration leading to supply management performance. The sample for this study includes 152 executive level supply management professionals. The empirical results suggest that strategic skills and perceived status are essential antecedents to supplier integration and subsequent performance. Further, the relationship between strategic skills and performance is mediated by supplier integration. Results of a dominance analysis also suggest which strategic skills are most likely to explain status integration, and performance. These findings have significant implications for supply management theory and practice.     

Cost allocation of WCDMA and wholesale pricing for mVoIP and data services

This study estimates cost-based prices for wholesale voice and data services provided to 3G (WCDMA) MVNOs according to their distinct types. For estimation, 3G MVNOs are classified into different types, and the overall cost of WCDMA facilities are separated into voice and data components based on their subscriber rates, actual traffic rates, as well as efficiency consideration of traffic rates. The study then calculates cost-based wholesale prices of voice and data services for each of the 3G MVNO types. The result of this study shows that a cost-plus pricing scheme can help achieve the policy goals of the regulator, namely, lowering telecommunications tariffs and facilitating the introduction of new convergent-type services, far more effectively than the current retail-minus pricing scheme. The findings of this study may assist firms in developing business models based on 3G networks and telecom regulators in designing policies related to interconnection, mVoIP, prepaid calls, wholesale services, and network neutrality.