PDC钻头在东海西湖凹陷的实践与认识

文章针对在东海西湖凹陷六口井 31 1 .2mm及 2 1 5 .9mm井眼所使用的PDC钻头统计分析 ,并结合笔者自己使用PDC钻头的实践 ,提出使用PDC钻头时注意环节 ,建议针对西湖凹陷地层的特点选择适合该地区的PDC钻头类型     

炼铜转炉出铜沟用浇注料的研制与应用

研究了碳化硅、硅微粉及烧结剂加入量对高铝 -SiC质超低水泥浇注料性能的影响 ,并确定了浇注料的合理配方。经在出铜沟使用 ,取得了较好的使用效果。     

某空调工程采用冰蓄冷系统的技术经济分析

在对冰蓄冷空调情况介绍之后,提出对空调工程采用冰蓄冷系统进行技术经济分析的方法和步骤,并以某工程为例进行分析.     

Verification of thermal restraint of a railways trough structure by long-term monitoring

At the central railway station of Berlin a trough structure was erected to extend the tracks from the underground station to ground level. The trough is subjected to high ground water pressure. Safety against up-lift called for the coupling of the trough with the underwater concrete slab and the back-anchorage of the structure by piles. Such coupling leads to high restraint due to hydration of the concrete and the ambient weather. Analysis required assumptions regarding the interaction between the trough and the impeding sub-structure, as well as the stipulation of load-independent design actions based on meteorological studies. The owner decided to install a long-term monitoring system in order to verify the thermal and mechanical response of the structure. However, the main goal of monitoring is the improvement of specifications for design and tender of future structures with comparable complexity. The program and the monitoring techniques will be described, and specific results will be reported. Preliminary conclusions are drawn.     

槽式太阳能热发电跟踪控制系统设计

针对太阳能利用效率不高和跟踪控制系统成本较高这两个制约太阳能应用的主要问题,研制了一套单轴槽式太阳能热发电跟踪系统。该系统的跟踪装置具有结构简单、制造成本低的优点。系统采用视日轨迹控制方法作为跟踪控制方法,采用PLC作为控制元件,驱动步进电机进行跟踪。试验结果表明,该系统的跟踪精度为±0.5°。     

电解槽罩板装卸装置的设计研究

电解槽罩板装卸装置是安装在铝电解多功能起重机上的辅助生产装置.文中阐述了该装置设计研究的重要性,介绍了国内外的研究现状及目前槽罩板的结构形状.文中以一种结构的槽罩板为基础,并综合考虑其他槽罩板的形状进行了设计研究,介绍了该装置的设计方案,详细地说明了该装置的布置形式及结构组成,并对各组成部分的功能及特点进行了分析论述....     

槽式太阳能集热发电系统发展状况

本文简要介绍了槽式太阳能集热发电系统的组成、关键技术、国外应用现状及国内研发状况。基于包括槽式太阳能系统在内的太阳能光热发电技术今后必然会在中国得到大力发展这样一个预期,本文作者根据自身的实际工程经验对未来中国的商业化规模的槽式太阳能热发电系统的工程设计提出了自己的建议。     

东海陆架盆地西湖凹陷油气发现历程回顾

东海陆架盆地的油气发现开始于1980年,并主要集中于西湖凹陷。从1980年至1995年是东海油气勘探成果辉煌的15年,期间共发现了平湖、春晓、天外天、宝云亭、武云亭、孔雀亭、断桥、残雪等8个油气田及一大批含油气构造。     

A new trough solar concentrator and its performance analysis

The operation principle and design method of a new trough solar concentrator is presented in this paper. Some important design parameters about the concentrator are analyzed and optimized. Their magnitude ranges are given. Some characteristic parameters about the concentrator are compared with that of the conventional parabolic trough solar concentrator. The factors having influence on the performance of the unit are discussed. It is indicated through the analysis that the new trough solar concentrator can actualize reflection focusing for the sun light using multiple curved surface compound method. It also has the advantages of improving the work performance and environment of high-temperature solar absorber and enhancing the configuration intensity of the reflection surface.     

Trace metals in cut trough shell (Spisula subtruncata) from Belgian coastal waters

In the period 1985-1996 concentrations of mercury, cadmium, lead, copper, zinc and chromium in cut trough shell (Spisula subtruncata) sampled on 11 stations on the Belgian Continental Shelf were determined. On the whole, contents of trace metals showed a tendency to decrease. No significant differences in concentrations were found between the stations, except on one site for lead and chromium. Average concentrations (all stations) were (in mg/kg wet weight): 0.02 for mercury, 0.08 for cadmium, 0.38 for lead, 2.5 for copper, 12.7 for zinc and 0.47 for chromium. These values were well below legally authorized limits.