轧制道次间插入冷却对特厚钢板组织与性能的影响

使用实验轧机旁冷却装置配合轧机进行轧制实验，研究轧制道次间不同冷却工艺对特厚钢板组织和性能的影响规律.研究结果表明:采用道次间冷却工艺可以在全厚度方向获得组织细化及强韧性提高效果，采用强冷道次间冷却实验钢1/4处晶粒尺寸可细化至10μm，强度为376MPa，-40℃冲击功为169J;心部晶粒尺寸可细化至15μm，强度为360MPa，-40℃冲击功为123J.本工艺可形成470μm厚表层细晶层，晶粒尺寸可细化至5μm;粗轧道次间插入冷却工艺轧制钢板强度和冲击韧性优于中间坯冷却工艺;随冷却强度增加，钢板内部组织明显细化且强度大幅提高.     

模糊物元精细评价方法在油水井酸化选井选层中的应用

油水井酸化是油气藏常用的增产增注措施之一．酸化措施足否有效取决于多方面的因素，而选井选层是其中一个重要环节．本文采用模糊物元分析疗法，用油水井代表事物，评价因素代表特征，建立了复合模糊物元矩阵，对油田整个区块需要酸化作业的井位和对应层位进行了综合决策，排列出需要进行酸化的井位和层位的先后顺序，为进一步施工奠定了理论基础．该方法排除了人为因素的影响，达到了科学决策的目的．文中选用某油田六口井的实际资料进行了计算，其结果与实际情况一致．     

双层钙钛矿Sr2FeMoO6，Ba2FeMoO6的电磁性质研究

分析了双层钙钛矿结构的锰氧化合物Sr2FeMoO6,Ba2FeMoO6物相结构和电磁学性质,对巨磁阻效应进行了探讨,揭示了Sr2FeMoO6样品为半导体导电性,Ba2FeMoO6样品为金属导电性.     

解读“节约型政府”

建设节约型政府是当前我国政府改革的必然要求。节约型政府模式的选择有其必然性。节约型政府应是廉价政府、廉洁政府、透明政府和效益政府。应通过加强节约型政府的制度建设、在行为方面加强政府自身建设、在各级政府中牢固树立节约理念和成本意识等措施全力，打造节约型政府。     

四川红层分布区地下水水化学若干问题探讨——以自贡市为例

利用钻孔试验分析了自贡红层分布区地下水水化学的水平及垂直分布特征,探讨了该区地下水的水化学特征及形成原因,进而探讨红层水资源开采等引起的咸淡水混合、水质变化等相关环境问题.     

电磁相分离法制备自生表层复合材料

采用电磁相分离法制备出以初生富铁相（AlSiFeMn复杂金属间化合物）为增强相，表层硬度为HB62．25，基体硬度为HB59．00的Al-11.70%Si-1.20?-1.50%Mn合金自生表层复合材料，增强相的显微硬度为HV 842。87，大小为20－80μm，该表层复合材料同基体材料相比，耐磨性提高了57．41％，所用方法工艺过程简单，成本低，为解决材料在服役环境中不同部位，不同性能的问题提供了新途径。     

Simulation and Experimental Analysis of Super High-Speed Grinding of Ductile Material

This study aims to reduce the work-affected layer of the machined surface by carrying out the grinding at the speed over static pr o pagation speed of plastic wave of ductile materials and also aims to clarify suc h super high-speed machining mechanism.This paper reports on the result obtain ed through the molecular dynamics simulations and experiments on the super-spee d grinding below and beyond static propagation speed of aluminum.From the simul ation results,it is verified that the plastic deformation ...     

The genetic diversity of cen-tral and peripheral popula-tions of ratlike hamster(Cricetulus triton)

The impact of habitat fragmentation and isolation on the genetic diversity of populations has attracted much attention in studies of meta-population and conservation biology. In this work, using the randomly amplified polymorphic DNA (RAPD) technique, we studied the genetic diversity of central, peripheral and peninsular populations of ratlike hamster, which were collected in five locations of the North China Plain and its surrounding areas, in 1999. The study revealed that, ⅰ) the genetic diversity of central population of Raoyang County＞the sub-central populations of Gu'an County and Taikang County＞the peripheral population of Shunyi District＞the peninsular population of Mentougou District; ⅱ) the genetic diversities of the five populations were positively correlated to the nearest distances to the peripheral line of population distribution; ⅲ) there were significant differences of gene frequencies of some RAPD fragments among the five populations. More RAPD fragments disappeared in peripheral populations than in central or sub-central populations. The frequencies of two RAPD fragments were correlated to the latitude. This study clearly indicated that the variation of the genetic diversities of the five populations was caused by edge effect and frag- mentation through the enhanced inbreeding and genetic drift, and thus supported the view that habitat fragmentation and related edge effect reduce the population genetic diversity.     

移民村落的权力博弈与移民的适应——以广东三峡移民村落白村为例

通过对一个安置在广东的三峡移民村落白村首任村长上任、下台的调查与分析,探究了移民村落的乡村权力“博弈”过程,以及这种乡村权力与移民适应的关系,指出帮助移民获得适当的社会资本是帮助移民更好地适应的策略之一。     

流动电势用于角加速度传感器的研究

分析和讨论了一种新型角加速度传感器的工作原理与设计方法。该传感器是根据流动电热效应，直接将角加速度信号转换为电信号输出的。和其它形式的角加速度传感器相比，它具有结构简单、成本低、可靠性好、稳定性高等特点。