特低渗油藏水平井布井方式研究

本文以西峰油田董志区长8油藏为例，运用数值模拟技术，研究了水平井组合方式及其井网形式。研究结果表明，水平井是提高特低渗油藏开发效果的有效途径。结合长庆特低渗储层吸水性能好的特点，认为采用直井注水，水平段走向垂直于储层最大主应力方位的水平井采油的井网组合开发效果最佳。     

Targeted Synergy between Adjacent Co Atoms on Graphene Oxide as an Efficient New Electrocatalyst for Li–CO2 Batteries

Li–CO₂ batteries are an attractive technology for converting CO₂ into energy. However, the decomposition of insulating Li₂CO₃ on the cathode during discharge is a barrier to practical application. Here, it is demonstrated that a high loading of single Co atoms (≈5.3%) anchored on graphene oxide (adjacent Co/GO) acts as an efficient and durable electrocatalyst for Li–CO₂ batteries. This targeted dispersion of atomic Co provides catalytically adjacent active sites to decompose Li₂CO₃. The adjacent Co/GO exhibits a highly significant sustained discharge capacity of 17 358 mA h g^?1 at 100 mA g^?1 for >100 cycles. Density functional theory simulations confirm that the adjacent Co electrocatalyst possesses the best performance toward the decomposition of Li₂CO₃ and maintains metallic‐like nature after the adsorption of Li₂CO₃.     

CPLD在雷达伺服轴角编码电路中的应用

介绍一种针对正、余弦旋转变压器—数字转换器(RDC)模块，用复杂可编程逻辑器件(CPLD)技术实现伺服轴角编码电路设计的方案。分析了轴角编码器系统中14XSZ系列旋转变压器—数字转换器的原理、轴角粗精组合原理及轴角纠错原理。详细介绍了CPLD的内部功能电路、CPLD轴角粗精组合和纠错实现电路，以及CPLD的工作时序图。提出了利用CPLD实现轴角粗精组合处理的方案，并通过了实际系统运行的考验，证明该方案可行。     

劣化环丁砜再生技术的工业应用

分析了环丁砜劣质化机理.采用阴离子交换树脂净化劣化环丁砜的新工艺,大大提高了溶剂再生效果.有效缓解了芳烃抽提装置溶剂系统设备腐蚀问题.离子树脂交换再生技术的工业应用表明,装置环丁砜的pH值能持续稳定在8.0以上,总氯质量分数降至5.0μg/g以下,树脂运行周期在1个月以上,达到了预期目标,具有很好的推广前景.     

重力流沉积油藏剩余油分布规律及开发对策

以大港油区板北地区为例对重力流沉积油藏沉积和砂体分布特征以及储层非均质性进行了研究,并结合油藏注采方式研究,总结了该类油藏剩余油分布规律和开发潜力,同时针对油藏剩余油的分布特点及其受控因素进一步研究提出了切实可行的油藏挖潜开发对策,实践表明,所提开发策略可明显改善油藏开发效果,提高非均质油藏最终采收率.     

考虑衰减时变压器短路电磁力的数值计算

变压器突然短路时线圈中短路电磁力的计算,已在文献[1]中进行了研究;本文在此基础上进一步考虑了时间衰减对短路电磁力的影响。结果表明,稳态短路时线圈中的电磁力仅有一个恒定分量和一个100Hz分量;一般情况下,最大短路电磁力约为稳态短路电磁力幅值的3.5—6倍,且作用在窗口内部线圈的辐向电磁力比窗口外部的略大;轴向电磁力则略小。     

Combustion and emission characteristics of a two-stroke diesel engine operating on alcohol

Though, as a renewable energy resource, alcohol fuel has many advantages in China, it is difficult for diesel engines to operate on alcohol due to its low cetane number and high latent heat of vaporization. This paper proposes an approach to its ignition problem by combining internal exhaust gas recirculation (EGR) with injection of small diesel fuel. Based on this approach, a two-stroke single-cylinder diesel engine was developed. Preliminary studies demonstrated that the engine can run on alcohol with almost zero level of smoke and low exhaust gas temperature, and that the engine operating on alcohol has lower nitrogen oxide (NO_x) emissions and 2–3% higher effective thermal efficiency than that operating on diesel fuel in moderate and high load zones.     

Investigation of novel anthracene‐bridged carbazoles as sensitizers and Co‐sensitizers for dye‐sensitized solar cells

Novel anthracene‐bridged carbazole organic dyes (designated ML4 and ML5) were synthesized using the Suzuki coupling reaction. These dyes were designed to be donor‐π‐conjugation‐acceptor sensitizers for dye‐sensitized solar cells, where the carbazole moiety acts as the donor, the anthracene moiety provides the π‐conjugation, and the cyano acrylic acid acts as the acceptor. Solar cells were fabricated with ML4 and ML5 alone with low power conversion efficiencies, but they were also used as co‐sensitizers with N719, improving the efficiency of the dye‐sensitized solar cells produced by ~3% and ~10%, respectively. Copyright © 2015 John Wiley & Sons, Ltd.