基于C8051F040电磁控制运动装置的实现

本文设计的是以16位低功耗C8051F040单片机为控制芯片的简易电磁控制运动装置,整个系统包含键盘模块、液晶显示模块、角度采样模块、恒流源模块、单片机控制模块、单摆机械装置模块、电磁控制模块等。由角度传感器、单片机以及恒流源构成闭环反馈控制,通过PID控制使电磁控制装置的磁场变化频率和单摆固有频率基本相等,以达到单摆的自由谐振,能够在允许误差范围内摆到指定角度及周期。     

一种实用机械设备振动信号的调理模块设计

在机械故障的诊断中,振动信号是不可缺少的重要判断依据.由于振动信号极其微弱,并且由于所处环境等原因,极容易造成频率混叠而导致不能直接进行A/D转换,这就需要在A/D转换之前对信号进行放大和滤波等调理方法,使其满足A/D转换的要求,文章论述一种振动信号处理的前端信号调理模块的设计方法,并针对其中的传感器恒流源供电、信号放大和滤波等部分作详细介绍.     

一种简便经济实用的热电阻测量方法

本文在分析讨论常用的热电阻测量方法的基础上,介绍一种适用于计算机采集系统的更精确、简便、经济的测量方法。     

发电机转子一点接地故障快速定位方法分析

本文介绍了天生桥二级水力发电有限公司(以下简称天二电厂)发电机转子一点高阻稳定接地情况,结合接地故障特性分析了几种常规查找方法的优缺点,创新性的提出了使用焊机作为恒流源的直流压降故障定位方法,通过采用该方法并结合二分法准确的完成对某电厂发电机转子一点高阻稳定接地故障的快速定位,提高了故障查找效率。     

1.44W LED照明驱动方案

本文介绍一种基于PI公司的LNK304P单片开关电源的LED恒流驱动器。输出电流为120mA,是一款非常合适的小功率LED驱动器。     

石墨烯的特性、制备与应用前景

近年来,石墨烯的发现具有重要的科学意义和应用价值,石墨烯的研究和制备也成为研究热点。首先介绍了石墨烯的发现历程,阐释了石墨烯的在热学、力学和电学方面的独特性质,归纳了石墨烯的主要制备方法和优缺点,指出了石墨烯的潜在应用领域,对其发展进行了展望和预测。     

结合关键链技术和Project软件编制施工进度计划

为了实现关键链技术和项目管理软件的结合,并在我国工程管理领域得到应用和普及,简要介绍了关键链技术,针对关键链技术的局限性,提出了合理工期计算方法,分析了工期中包含的工作日和非工作日,探讨了缓冲区的设置和缓冲时间计算的方法;分析了关键链技术和网络计划技术的异同,改良了Project 2003软件,克服了关键链技术和软件结合的瓶颈;建立了施工进度计划系统、网络计划技术模型和关键链计划技术模型,有助于施工进度计划的编制和优化.通过工程案例,编制了施工进度计划,计算简单、操作方便,证明方法可行.     

党的十七大的四大亮点与四大贡献

中国共产党第十七次全国代表大会听取和审议了党的第十六届中央委员会和中央纪律检查委员会的报告,并分别通过了相应的《决议》。大会听取和审议了关于修改《中国共产党章程》的报告,也通过了相应的《决议》。大会还公布了中国共产党第十七届中央委员会委员、侯补委员和中纪委委员名单。     

借鉴国外经验 健全含硫天然气开发的技术法规和行业标准体系

阐述了国内外高含硫天然气开发相关的技术法规、标准的范围和归属．介绍了可以借鉴的国外做法和体系，重点分析了目前国内AQ和SY两个行业标准体系在高含硫天然气开发方面的做法，提出了意见，并推荐了一批加拿大EUB法规和IRP标准．供下一步采标和制修订标准时参考。     

昔鉴国外经验健全含硫天然气开发的技术法规和行业标准体系

阐述了国内外高含硫天然气开发相关的技术法规、标准的范围和归属．介绍了可以借鉴的国外做法和体系，重点分析了目前国内AQ和SY两个行业标准体系在高含硫天然气开发方面的做法，提出了意见，并推荐了一批加拿大EUB法规和IRP标准．供下一步采标和制修订标准时参考。     

我国CCS发展的现状、前景及障碍

经济增长、能源结构和环境容量决定了CCS是我国应对气候变化的重要战略选择。介绍了我国CCS政策制定、技术研发、项目示范、国际合作等方面的现状,从潜力、成本、国情等视角分析了CCS发展的前景,从能耗、技术、资金、市场、环境等维度揭示了CCS发展的障碍,并提出了若干对策建议。     

Potential für Kraftwerke mit Kohlendioxidrückhaltung aus Systemperspektive

System considerations support a discussion of selected factors influencing the economic viability of power plants with CO₂ sequestration technology (CCS, for carbon dioxide capture and storage), leading to conclusions when and how much of their potential may conceivably be realised. The CCS realisation is interconnected to investments into other technologies, to technological advances, to the price of CO₂ emission certificates, to plant dispatch, and to the prices of power. In a system of CCS potential realisation by individual actors, these variables are endogenous. This article is mainly about them. CCS is more of a long term option than a bridge technology. In contrast to other CO₂ reduction technologies, both economic operation and economic investment necessarily require high CO₂ certificate prices. An increase in power plant efficiency without CCS, switching to natural gas and power generation from renewable sources involve more mature technologies that may benefit from further application within the coming decades. Even far beyond 2020 this effect may delay and dampen the potential of CCS technology. An economic or market potential is dependent to a lesser extent on assumptions about future barriers but rather on their dynamic interactions.     

碳捕捉与封存技术国内外研究现状评述及发展趋势

目前碳捕捉与封存（CCS）技术作为一种新的温室气体减排手段受到西方发达国家热捧,然而目前CCS还远未达到商业化推广阶段,其大规模实施还存在一定的不确定性。中国作为煤炭生产和消费大国,CO2减排形势相当严峻,对CCS进行深入研究就显得十分重要和迫切。由于我国在该领域的研究刚刚起步,为促进我国CCS的研究工作,对国内外的研究现状进行了综述,从研究领域、研究角度和研究方法总结了发展趋势,并指出了目前研究中还需要进一步加强的领域。     

主要经济体低碳技术国际合作及其启示

面对日益严峻的全球气候变化形势和日趋紧迫的温室气体减排要求，全球主要经济体加强了在低碳与气候友好技术领域的国际合作，推出了主要经济体能源与气候论坛技术行动计划。技术行动计划集中关注了先进汽车、生物质能利用、碳捕集利用与封存、建筑部门提高能效、工业部门提高能效、高效低排放燃煤、海洋能利用、智能电网、太阳能利用和风能利用等10项低碳与气候友好技术。我国在技术行动计划中应以终端用能技术、核能技术为重点，在碳捕集利用与封存领域做好技术储备，在不同阶段采取财政补贴和排放交易的政策促进低碳与气候友好技术的发展。     

The mediator effects of conceiving imagination on academic performance of design students

Three studies were combined to examine the effects of creativity and imagination on the academic performance of design students. Study 1 conducted an exploratory factor analysis to determine the most appropriate structure of the Creativity Capability Scale (CCS) in a sample of 313 college students. The scale was a new self-report measure, and it was developed to be both empirically valid and easy to administer. A two-factor solution identified originality and useful flexibility as dimensions of human creativity. Study 2 conducted a confirmatory factor analysis to confirm the established structure of the CCS in a sample of 284 college students in design schools. In addition, we also confirmed the structure of the Imaginative Capability Scale using the same sample. A three-factor solution supported an earlier study in which human imagination was categorized into three types, namely initiating, conceiving, and transforming imaginations. The analyses of composite reliability and construct validity gave both scales good support. Study 3 further tested the effects of creativity and imagination on academic performance in a sample of 271 design students. The hypothesis of Study 3—that conceiving imagination acted as a mediator between creativity/imagination and academic performance—was partially supported. The structural model also showed that useful flexibility, initiating imagination and transforming imagination demonstrated positive, indirect effects on academic performance. Critical reflections on the results are provided. Discussions for future studies are also proposed.     

Beitrag von technologischen und strukturellen Veränderungen im Energiesystem der EU-27 zur Erreichung ambitionierter Klimaschutzziele

To stabilise the concentration of GHG (Greenhouse gases) in the atmosphere to a level of 450ppm (parts per million), a strong climate policy in the EU-27 will be required. The target is achievable through a 71% reduction of GHG emissions from 1990 emission levels by the year 2050. With the regionalised Pan-European TIMES energy system model, the role of technologies with regard to efficiency improvement, fuel switching and energy saving measures will be analysed under such an emission reduction target. The Pan-European TIMES model illustrates in detail the whole energy system of the different member states of the EU-27 plus Iceland, Norway and Switzerland. The limited resource and import potentials of different energy carriers, the competition of the use of energy carriers among different sectors and the country specific differences in energy demand will be taken into account. The results show that the energy consumption of the EU is influenced rather by political targets and positions related to climate protection, security of supply and the use of nuclear energy than by the available technological options. Under a climate protection scenario with restricted use of nuclear energy, the most commonly used options are to increase the use of renewable energy in all sectors, produce electricity in combination with carbon capture and storage (CCS) and to increase the use of electricity over other fuel sources in the demand sectors. Furthermore, technological improvements will be required throughout the entire energy system if political targets are to be successfully realised.     

Bedeutung von CO2-Transport- und Speicheroptionen im europäischen Energiesystem

Aiming the stabilisation of the CO₂ concentration in the atmosphere at 450 ppm, a strong climate policy in the EU-27 will be required. Carbon Capture and Storage (CCS) and the building up of a CO₂ pipeline system will be one option to avoid climate change. The analysis of the potential CO₂ storage options in Europe shows a huge potential in the North Sea and their neighbouring countries and only less potentials in the southern European countries. A scenario analysis using the European energy system model TIMES PanEU shows that the installation of CO₂ transport pipelines for cross boarder exchange of CO₂ from power plants located next to the boarder could be one possible infrastructure solution. This solution is a cost efficient option which will be used mainly by the North Sea neighbouring countries (Germany, UK, the Netherlands, Denmark) and Poland. A central pipeline grid in the North Sea for the usage of huge storage options like the Utsira formation will be important in the future for countries with limited CO₂ storage capacities (like Belgium or the Netherlands). If cheap storage options like onshore Aquifers are not available, the design of central CO₂ pipeline grids has a strong impact on the power plant structure, the electricity and CO₂ certificate price. Based on a limited availability of onshore CO₂ storages the electricity price will increase by up to 16 € 2007/MWh and the CO₂-certificate price will rise by additional 35 € 2007/t CO₂ in 2050.     

产业融合理论以及对我国发展信息产业的启示

随着技术革新的不断发展，产业融合正日益成为产业经济发展中的重要现象。产业融合产生的前提是技术融合、业务融合、市场融合以及产业管制环境的变化。按照技术发展的方向，产业融合有产业渗透、产业交叉和产业重组三种形式。由于信息技术的渗透性、带动性、倍增性、网络性和系统性等特征，信息产业的产业融合呈现加速发展的趋势。信息产业的融合有助于提高信息产业的生产效率，改善信息产业的管制方式，加速传统产业的升级改造以及促进信息技术的扩散和渗透。因此，深入研究产业融合理论以及产业融合对于我国信息产业发展的影响，对推动我国的信息化进程，促进产业结构的优化升级具有重要的理论和现实意义。     

An analysis of the profitability of businesses of diversified companies

This paper presents empirical evidence on the relationship between diversification and profitability. The data set used in the analysis includes data on 55 U.S. corporations who participated in phase II of the project on Profit Impact of Market Strategy (PIMS).Following upon the pioneering work of Carl Kaysen, complex indices of diversification are developed. Cross sectional regression analyses indicate a statistically significant positive association between measures of corporate diversification and measures of business profitability (return on investment or profit margin on sales). These relationships are insensitive to variations in the treatment of outliers, and do not appear to be accounting artifacts.     

在招投标工作实践中关于议标的思考

在我国《招投标法》中仅限定了公开招标和邀请招标两种招标方式，但议标作为一种特殊的招标方式在招投标实践中有其存在的现实价值，并且满足了我国迅速发展的日益多元化的投资市场招投标的需要。主要分析思考了议标存在的意义和及其与招标方式的区别。