采油集输管线结垢及腐蚀机理研究

伴随着三次采油技术的广泛应用,集输管线上出现的结垢和腐蚀现象越来越突出,并且结垢严重的地方腐蚀也非常严重。这一现象严重影响了稻田开采效益及三元复合驱技术的进一步推广。本文分析了三元复合驱结垢、腐蚀的影响因素,研究了结垢、腐蚀机理并总结了防护方法进,为三元复合驱技术的进一步发展,提高注采化学剂的有效利用率,完善油田防垢、防腐工艺具有深远意义。     

Optimization of Root Section for Ultra-long Steam Turbine Rotor Blade

This study presents the comparison of aerodynamic performances of two successive designs of the root profiles for the ultra-long rotor blade equipped with a straight fir-tree dovetail. Since aerodynamic and strength requirements laid upon the root section design are contradictory, it is necessary to aerodynamically optimize the design within the limits given by the foremost strength requirements. The most limiting criterion of the static strength is the size of the blade cross-section, which is determined by the number of blades in a rotor and also by the shape and size of a blade dovetail. The aerodynamic design requires mainly the zero incidence angle at the inlet of a profile and in the ideal case ensures that the load does not exceed a limit load condition. Moreover, the typical root profile cascades are transonic with supersonic exit Mach number, therefore, the shape of a suction side and a trailing edge has to respect transonic expansion of a working gas. In this paper, the two variants of root section profile cascades are compared and the aerodynamic qualities of both variants are verified using CFD simulation and two mutually independent experimental methods of measurements (optical and pneumatic).     

韩国的“君子村”

上世纪70年代，为了加强农村建设，韩国开展了著名的“新村运动”，其中一项重要内容就是法制和道德建设。70年代末80年代初，为使农村法制和道德建设规范化、持久化，不断提高农民的守法意识，韩国在广大农村发起了评选“无犯罪村”活动，法务部还专门颁布了相关规定，制定了评选标准和实施办法。     

广州南沙滨海花园小区设计探讨

通过对南沙滨海花园设计的总结，阐述对住宅小区设计的一些认识，希望能起到供类似案例借鉴的作用。     

Fault Ride-Through Capability Enhancement of VSC HVDC connected Offshore Wind Power Plants

To achieve active control of the AC voltage magnitude of wind power plant(WPP) collector network and improve the fault ride-through (FRT) capability,an FRT scheme based on feed forward DC voltage contr...     

千兆IDS：大型网络的“安全哨兵”

故事背景“i博士,你注意到最近一段时间,金山、瑞星两家防病毒厂商之间的互相指责和攻击了吗?”一天早上,欧主管火急火燎地给i博士打电话。“一场小儿科般的闹剧!让一些被牵着鼻子走的媒体去炒作吧!”i博士不屑一顾地回答。看i博士并无谈此话题的兴趣,欧主管赶忙言归正转:“i博     

西得克萨斯和新墨西哥州东南部Delaware盆地Barnett页岩（密西西比系）的油气潜力

Delaware盆地的Barnett页岩（密西西比系）具有成为多产天然气生产带的潜力。该页岩有机质丰富并且盆地的很大一部分都是热成熟的。Barnett的深度范围从沿着西部边缘的7000ft（2133m）到沿着盆地轴的超过18000ft（5486m）。Barnett页岩开始生烃大约是250Ma，达到最高温度大约是260Ma。目前的热成熟度代表了最大埋藏和最高温度。根据测得的镜质体反射率值和干酪根转化率，Reeves县北部的井是处在气窗内。根据电阻率变化，该页岩可分为上部碎屑质单元和下部石灰质单元。根据不同的测井标记，下部单元可细分为5个子单元。初步分析表明，测井中标有高电阻率和高中子孔隙度读数的下Barnett层段具有高含气量。通过绘制大于50欧姆米的净电阻率图，可以描绘下Barnett未来勘探的重点区域。在Delaware盆地，Barnett页岩含有大量天然气资源。要实现这些资源的潜力取决于目前在这一页岩气区带进行的优化钻井和完井技术方面所做的努力。     

移动图书馆在高职学院的应用

20世纪互联网的兴起和发展使人们的工作和学习方式发生了巨大变化,人们的社会交流活动完全突破空间的限制,而现在的移动通信技术的日新月异的发展,移动互联网的兴起再次是人类的活动超越了时间、地点的制约。随着互联网的无线化延伸,移动网络成了网络发展的主题,图书馆的服务方式也应该赋予移动网络的内涵,创建新型的服务方式。移动图书馆作为一种新型的图书馆服务方式日益受到关注,其发展表现出明显的项目应用与理论研究并重的特点。     

Receptor-based QSAR studies of non-peptide human oxytocin receptor antagonists

In the present study, QSAR calculations were performed on the receptor-based alignment of 58 non-peptide human oxytocin receptor antagonists. With the aid of different scoring functions (AutoDock 3.05 built-in and X-Score 1.2) the evolved receptor-ligand complexes were characterized. By means of various datasets it was confirmed that the scoring functions were not capable to predict the biological activity correctly in compounds containing a rigid derivative in the variable region. To improve the pKi prediction 3D-QSAR calculation was performed. The regions related to the biological activity were determined by using cross-validated r2(q2)-guided region selection (q2-GRS) method. The predictive power of the CoMFA model [r(pred)2=0.89, q2(LMO, five groups)=0.695+/-0.034] allowed prediction of the biological activities of newly synthesized compounds and confirmed the receptor-based alignment.     

基于ZigBee协议的图像无线传输系统设计

本文提出了基于无线传感器网络的图像无线传榆系统.该系统以OV528作为JPEG图像数据压缩芯片,采用支持ZigBee协议的JN5121作为数据传输主控芯片,构成MESH结构的无线传感器网络,该无线传感器网络可以将JPEG图像数据发送到多个监控点.所提出的基于ZigBee协议的图像无线传输系统能耗极低、数据传输安全而且数据传输完全免费,具有较高实用价值,可以广泛地用于灾害监控、汽车防盗、安全监控等领域.