Activity Interaction Coefficients of Si in Cu-Ti-Si Melts at 1550℃

Activitibs of Si in binary Cu-Si and ternary Cu-Ti-Si melts were measured at 1 550℃ by using a method of chemical equilIbrium between gas and liquid. The activity interaction coefficients of Si in the melts have been determined from the experimental data (lny = -5.69. s = 6.69. P2: = -26.22. E; =-43.96) and activity interaction coefficients of Ti in binary Cu-Ti melt at 1550℃ has been estimated from Sommer's data based on the regular solution model (lny =-1 .10. : = 2.95.p:=-2.10).     

COUPLING PROCESS FOR Ti AND Si BETWEEN TITANIA SLAGS AND Cu MELTS AT 1500 ℃

ＣＯＵＰＬＩＮＧＰＲＯＣＥＳＳＦＯＲＴｉＡＮＤＳｉＢＥＴＷＥＥＮＴＩＴＡＮＩＡＳＬＡＧＳＡＮＤＣｕＭＥＬＴＳＡＴ１５００℃￥Ｘｕｅ，Ｘｉａｎｇｘｉｎ；Ｃｈｅ，Ｙｉｎｃｈａｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＦｅｒｒｏｕｓＭｅｔａｌｌｕｒｇｙ，Ｎｏｒｔｈｅａ...     

从国内外建设经验探讨广州配电自动化建设模式

以配电自动化的组成和发展为起点,对国内外配电自动化的发展特点、应用情况和实现效果进行评述;通过分析广州电网不同供电区的特点和建设配电自动化的效益,提出广州配电自动化建设的模式和原则,即中心城区和市区配电自动化主要以电缆网自动化、开关房智能化改造和环网柜建设为主,市郊区可在环网率稍高的部分架空线实行架空自动化工程,农村地区实施配电自动化则无效益;应采取电网分区、功能分层、时间分步的建设原则。     

计及主变过载和联络容量约束的配电系统供电能力计算方法

针对基于主变互联和N-1准则的配电系统供电能力计算方法未能计及联络容量与主变短时过载的问题,提出解决方案并构建完善的配电系统供电能力计算方法。一方面通过建立联络约束矩阵来适应变电站间联络线容量较大的差异性;另一方面,定义虚拟联络矩阵来描述因主变短时过载而产生的负荷二次转带过程,在此基础上,建立负荷综合转移矩阵。最后将上述2项改进引入到基于主变互联和N-1准则的配电系统供电能力计算方法之中,形成考虑实际配电系统运行状况的配电系统供电能力计算方法。通过某实际配电网的供电能力分析,验证所提出方法的有效性。     

高层筒体结构弹塑性地震反应计算

对高层简体结构进行弹塑性地震反应分析，基本未知量很多，基本参数的确定也较困难。本文采用广义有限条法对筒体结构作弹塑性地震反应分析，以构件为基本单元，计算参数和恢复力曲线容易确定。本文综合应用和发展了有限元法和有限条法的优点，计算精度和有限元法相当。     

安钢中板机组热送热装攻关实践

针对安钢中板机组热送热装比例偏低的问题,通过改变管理方式,将热送温度标准量化为时间标准,借助信息化手段,细化管理热送每个时间节点,开展二切切割达产攻关,使中板机组综合热送率由2009年11月的11%,提高到2010年3～9月的80%以上.     

耐盐耐温耐油水基微泡钻井液的制备

研究并测试了不同起泡剂、稳定剂及黏土对耐盐耐温耐油微泡钻井液的影响.实验发现耐温耐盐的微泡钻井液与起泡剂和稳定剂的结构有关,而起泡体系的耐油性与各种物质在泡沫界面的吸附状态有关.选用具有枝型结构的发泡剂和具有耐盐、耐温结构的起泡剂和稳定剂制备微泡体系,可使其具有好的耐盐、耐高温老化的性质,选择适当的无机有机物质进行复配,可在泡沫界面形成亲油但是不溶油的弱极性界面吸附层,使体系有很好的耐油性.由DM5512、甜菜碱、烷基糖苷、1631混合制备成了离子型复合起泡剂QR-1,由HPMC、SMP-Ⅱ和SP-8混合制备成了稳定剂WD-1.实验评价了由QR-1、WD-1和黏土在矿化度为10×104 mg/L的基液中配制的微泡钻井液的耐盐、耐高温老化和耐油性能,证实了以上结论并探讨了其机理.     

MOCVD-derived GdYBCO tapes with smooth surface and low Rs based on a new self-heating technology

The metal organic chemical vapor deposition (MOCVD) method was used to prepare GdYBCO films on LaMnO₃/ homo epitaxial-MgO/ ion-beam-assisted-deposition-MgO/ solution-deposition-planarization-Y₂O₃ buffered Hastelloy tapes. By adopting a simple self-heating technique, the substrates were heated by the joule effect after applying a heating current (I_h) through Hastelloy metal tapes. The effects of substrate temperature and (Gd, Y)/Ba ratio (r_c) in the precursor on the biaxial texture, surface morphology and superconducting performance of GdYBCO films were systematically investigated by varying the values of I_h and r_c. Needle-like outgrowths formed on the substrate surface were characterized using a scanning electron microscope, energy dispersive spectrometer and X-ray diffraction system. The results show that a high I_h or r_c leads to the formation of needle-like outgrowths. Therefore, I_h and r_c are crucial process parameters that control the growth of needle-like outgrowths on the surface of GdYBCO films. Three hundred nanometer thick GdYBCO films were prepared at different I_h and r_c by the MOCVD process. At an I_h of 27.0?A and an r_c of 0.6, the surface of the GdYBCO film was very smooth and dense, which can provide a good template for multiple depositions of GdYBCO films. The critical current density of the deposited 300?nm-thick GdYBCO film was 4.4 MA/cm² (77?K, 0?T), which is attributed to good biaxial texture and appropriate film composition. Furthermore, the microwave surface resistance (77?K, 10?GHz) of the GdYBCO film was merely 0.581?mΩ.     

防高能辐射的树脂/纳米铅复合材料的制备及研究

制备了不同铅含量、不同树脂类型的树脂／纳米铅和树脂／纳米硫酸铅防高能辐射复合材料。测得了各样品对高能X射线和B射线的屏蔽率、样品中纳米铅和纳米硫酸铅颗粒的大小和形状。研究了样品的密度,内部纳米铅或硫酸铅颗粒的大小、形状各因素与高能X射线和B射线衰减性能之间的关系。结果表明,对于同样铅质量分数和同种树脂来说,树脂／纳米铅或纳米硫酸铅比相应树脂／常规铅或常规硫酸铅的屏蔽性能要好;样品防高能X射线和B射线的能力不仅取决于树脂的类型和所含铅或硫酸铅的质量分数、样品的密度,而且也与树脂中纳米铅及纳米硫酸铅颗粒的大小、分布的均匀程度有关。根据试验结果,初选了一种密度小、铅含量少、对高能X射线和β射线屏蔽性能好的聚苯乙烯磺酸钠／纳米铅复合材料。