Distributed wireless power transfer in sensor networks with multiple Mobile Chargers

We investigate the problem of efficient wireless power transfer in wireless sensor networks. In our approach, special mobile entities (called the Mobile Chargers) traverse the network and wirelessly replenish the energy of sensor nodes. In contrast to most current approaches, we envision methods that are distributed and use limited network information. We propose four new protocols for efficient charging, addressing key issues which we identify, most notably (i) what are good coordination procedures for the Mobile Chargers and (ii) what are good trajectories for the Mobile Chargers. Two of our protocols (DC, DCLK) perform distributed, limited network knowledge coordination and charging, while two others (CC, CCGK) perform centralized, global network knowledge coordination and charging. As detailed simulations demonstrate, one of our distributed protocols outperforms a known state of the art method, while its performance gets quite close to the performance of the powerful centralized global knowledge method.     

Hydrology,topography and demography matter: Why care needs to be exercised when assessing water prices and regulation and the extent to which they conform with best practice

Water tariffs frequently seek to achieve multiple objectives, some of which may conflict. However, the nature and rationale for those conflicts is not always understood or appreciated. This paper consider how localised natural and human phenomena can shape the extent to which so-called ‘best practice’ economic regulation and pricing can be expected to take hold in Victoria and South Australia. Overall, we find that there is room for improvement in the institutional arrangements that circumscribe water pricing in some cases, but direct comparisons are not always helpful, especially when the underlying hydrology, topography and demography of states differs markedly.     

基于充放电原理实现的微电容测量电路

具有抗分布电容以及简单实用等特性的充放电电路是目前微电容测量中广泛采用的一种测量电路。本文对基于充放电原理的微电容测量电路进行了深入研究，并介绍一种基于充放电原理的实用电路。     

Measurement of specimen charging in scanning electron microscopy with a kelvin probe

A vibrating Kelvin probe in form of a platinum wire loop is used to measure the surface potential U_s on electron-irradiated free-floating metal and insulator specimens as a function of electron energy E. This allows an accurate measurement of the critical electron energy E₂ for no charging. At energies below E₂, the positive charging increases with decreasing energy to U_s=2–5 eV at E=0.5 keV and switching off the collector bias of the Everhart-Thornley detector. A two-to threefold increase of U_s is observed when the bias is switched on. For E > E₂, the strong increase of a negative surface potential can be measured. Insulating films free-supported on a conductive substrate show a steep decrease to small positive and negative U_s when the film thickness becomes lower than the electron range at a critical energy E₃ > E₂. At insulating specimen the temporal decrease of charging can be measured when the electron beam is switched off.     

炮孔内空气间隙作用的机理探讨

本文探讨了装药结构中空气间隙作用的机理,提出了气体分子的迁移效应与碰撞效应,比较完满地解释了不同空气间隙对爆破效果的影响.     

农村电话用户市场调查与分析

受中国电信委托、原邮电部经济技术发展研究中心在全国进行一次农村电信市场调查，以了解当前农村通信市场发展潜力，本文公布了此次调查的结果，从经济能力、资费和潜在市场等方面提出了发展农话的建议 。     

八钢高炉无料钟炉顶的装料制度

以八钢高炉炼铁实践为依据，系统研究和分析了八钢2号和3号高炉炉顶设备装料制度对高炉冶炼的影响。认为高炉操作制度是当前高炉炼铁的主要技术之一，也是影响高炉焦比主要技术经济指标的重要因素。在原燃料和装备水平一定的条件下，合理的操作制度对高炉的技术经济指标起到决定性的作用。     

塔里木盆地塔河油田原油中双金刚烷分布特征与油气运移

研究了塔里木盆地塔河油田原油中双金刚烷的分布特征，探讨了该油田油气的充注期次和运移方向，结果表明，原油中双金刚烷指标值反映了原油的成熟度，并且指示研究区4区和6区原油充注时间较早、9区原油充注时间较晚，其它油区原油充注时间介于上述二者之间；原油中双金刚烷指标值分布特征显示出塔河油田下奥陶统油气存在2个充注方向，一是由南向北，并且油气成熟度相对较低，可能主要代表了早期的油气运移，另一个是由东向西，原油成熟度相对较高，可能主要代表了晚期的油气运移。根据原油成熟度和运移方向特征，认为塔河油田的早期油气起源于满加尔坳陷，晚期油气起源于满加尔坳陷和草湖坳陷，主力烃源岩层为寒武-奥陶系。     

炉壁集束碳氧枪在电炉中的应用

介绍了鄂钢电炉厂70t consteel 电炉使用炉壁集束碳氧枪后对经济指标的改善,以及在生产实践中的冶金效果.     

扩大3~＃高炉上料能力的软、硬件改进

济钢第一炼铁厂３~＃高炉，（３５０ｍ~３）大修后采用了工业计算机、液压传动等先进的控制系统，但由于设备工艺布局不合理，使先进的技术不能充分发挥效率。通过对软、硬件的部分改进，挖掘了控制系统的能力，达到了少投资多受益的目的。