页岩气勘探开发技术综述

松辽盆地大量含油气泥页岩的开发正在进入新的阶段。虽然我国传统意义上的泥页岩裂隙气藏等并不被划入完整意义上的页岩气,但其开发技术却与页岩气的开发有着不可分割的借鉴价值。本文通过对当今世界页岩气开发技术的梳理,力求为吉林探区的泥页岩气开发提供参考。     

斯堪尼亚将向中联重科交付新一批重卡底盘

近日,中联重科向斯堪尼亚订购了375台重型卡车底盘用于混凝土泵车上装。该订单将在2012年4月交付。斯堪尼亚凭借独有的模块化生产系统,为中联重科量身定制一款坚固的卡车底盘,以最大程度的满足其对车身和操控方面的需求。该卡车底盘可以以最大扭矩每天连续工作14 h。     

二次系统等电位接地网的敷设在沙梁水电站中的应用

针对水电站发生接地故障时,大的短路电流在电站主接地网上产生巨大的相对电位差,会对二次设备产生磁性干扰,影响电气二次设备的正常运行,甚至损毁设备的情况。通过敷设二次系统等电位接地网,使二次电气设备地电位相等,阻止主接地网不均匀电位对于二次设备的危害,确保电网的可靠安全运行。结合沙梁水电站的工程敷设情况,分析该水电站二次系统等电位接地网敷设的基本原则、注意问题及实施方案,提出电气二次系统等电位接地网敷设方面的工程建议。     

利用铝型材厂工业废渣增强轻质砖性能

把铝型材厂工业废渣预处理成铝废渣熟料,分析处理前后铝废渣的综合性能。在原轻质砖配方的基础上掺入一定量的铝废渣熟料,调整配方及烧成曲线,制备出性能良好的轻质砖,对所制备轻质砖进行强度、吸水率、比重、SEM、XRD等测试分析,结果显示其抗折强度在19 MPa以上,约为行业标准值的2倍,较原轻质砖配方有显著提升,吸水率为0.296%,比重在1.33~1.40 g/cm3,通过XRD分析,其主晶相为AlPO4和SiO2,及少量的α-Al2O3晶相。SEM图上可观察到添加铝废渣后的试样的大小孔相间均匀,且多为圆孔,贯穿孔比未添加铝废渣的试样少,骨架连接完整。     

超宽带通信技术的研究现状与发展前景

超宽带通信具有系统容量大、数据传输速率高、抗多径能力强、成本低、功耗低、信号衰减较小、定位精度高、穿透力强等优点,是下一代无线通信的革命性技术之一。文章简述了UWB技术的理论依据及技术方案;探讨了UWB关键技术的研究现状;阐述了UWB技术的研究方向与发展前景,指出随着研究工作的不断深入,将逐步找到UWB技术现有问题的解决方案,其技术将更加成熟,这项新技术必将在通信领域和电子领域得到广泛的应用,发展前景十分广阔。     

Study on purification and application of novel precipitant for ceria-based polishing powder

Novel precipitant prepared through carbonation with MgCl2 wastewater generated from rare earth extraction separation process and low-price dolomite as raw materials was studied in this paper. The purification methods of novel precipitant by adding appropriate oxidizing agent were studied. It was found that optimal purification result could be achieved with sodium hypochlorite as iron removal reagent and the iron removal rate could reach up to 90% when the adding amount was 0.1 vol.%. During the preparation, the particle size and distribution of ceria-based polishing powder were affected obviously by the parameters such as concentration, reaction temperature and feeding rate. The results showed that ceria-based polishing powder with D50 =2.5-3.5 μm and the particle size distribution of 0.65-0.75 μm could be prepared when the concentration of CeCl3 was 0.6 mol/L, the reaction temperature was maintained at 50 °C and the feeding speed was controlled at 25 ml/min. Compared with commercial powder, the self-made polishing powder had roughly the same cutting amount, but the surface finish of polished glass was better than that of commercial polishing powder.     

水文站网改建工程建设效益评价

在松辽水利委员会的组织及管理下,完成了松辽流域省界断面水资源监测站网28处水文站的改建任务,项目已经通过竣工验收,各改建水文站正在正常运行。本文对项目实施后的建设成效和运行初期所产生的社会效益进行了评价,并对今后的运行管理提出了建议。