金川三矿区低品位铜镍矿石工艺矿物学研究

通过工艺矿物学研究,查明了金川三矿区低品位铜镍矿石的矿物组成、铜镍的赋存形式及主要有用矿物的嵌布特性。研究结果表明：矿石中的铜、镍主要以镍黄铁矿、紫硫镍铁矿、黄铜矿、墨铜矿形式存在,但其他硫化矿物及脉石矿物与它们嵌布关系密切而复杂;矿石蛇纹石蚀变严重,易于泥化。这些将给铜、镍的分选带来不利影响。     

云南个旧矿田大白岩测区多元异常信息找矿预测

大白岩测区位于个旧矿田卡房矿区东部。该区找矿预测目标为产于印支期变火山岩内及其附近围岩中的似层状铜矿体和锡铜多金属矿体。根据测区内隐伏矿体埋深大和基岩出露好的特点,制定了构造地球化学—遥感蚀变信息—大地电磁测深多元信息找矿策略。测区地表发育Cu、Sn、As、Pb、Zn、Sb元素构造地球化学异常,结合多元统计分析,厘定隐伏铜矿的构造地球化学找矿标志为Cu-As元素组合异常及因子得分Y(i,3)异常,隐伏锡铜多金属矿的构造地球化学找矿标志为Sn-As-Sb元素组合异常及因子得分Y(i,1)与Y(i,2)异常;在试验剖面测量和岩石物性参数测试基础上,按200 m×100 m网度完成高频大地电磁测深剖面12条,探测深度1000 m,根据推断的变火山岩空间位置及低阻异常中心的分布,在剖面上圈定了找矿有利部位。结合地质及遥感铁化蚀变异常信息,圈定找矿靶位3处。其中,a1靶区经钻探工程首先验证,平均品位达到0.593%,已达到工业要求。     

葛泉矿大倾角工作面三机配套改造及防倒防滑研究和应用

介绍大倾角工作面的设备配套,为适应大倾角采煤,对采煤机、液压支架和刮板输送机的改造及防倒防滑装置设计改造技术进行了探讨,达到了预期的目的,确保了安全生产,具有很好的推广价值。     

东深供水改造工程土建项目的计量与支付

为了在东深供水改造工程完工后及时完成结算工作,更好地进行工程竣工验收和交付,避免象某些工程完工后多年仍不能支付完成的情况,东深供水改造工程指挥部委托长江水利委员会、华北水利电力学院等单位的专家,对完工结算进行审核.对完工结算的依据和原则,工程项目变更的范围和内容,变更处理的原则进行了论述.对影响工程计量与支付的重要因素进行了分析.在东深供水改造工程的完工结算过程中创造出了一流的结算水平,使工程发挥最大投资效益的同时,各参建单位均在合同管理、经济技术、效益等方面有明显的提高.     

A Comparison of GluR-A-Deficient and Wild-Type Mice on a Test Battery Assessing Sensorimotor, Affective, and Cognitive Behaviors.

Previous studies have demonstrated a spatial working memory deficit in glutamate receptor (GluR)-A (GluR1) AMPA receptor subunit knockout mice. The present study evaluated male and female wild-type and GluR-A/ mice on a test battery that assessed sensorimotor, affective, and cognitive behaviors. Results revealed a behavioral phenotype more extensive than previously described. GluR-A/ mice were hyperactive, displayed a subtle lack of motor coordination, and were generally more anxious than wild-type controls. In addition, they showed a deficit in spontaneous alternation, consistent with previous reports of a role for GluR-A-dependent plasticity in hippocampus-dependent, spatial working memory. Although changes in motor coordination or anxiety cannot explain the dissociations already reported within the spatial memory domain, it is clear that they could significantly affect interpretation of results obtained in other kinds of behavioral tasks. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Redundancy and the choice of hydrologic indices for characterizing streamflow regimes

The utility of hydrologic indices for describing various aspects of streamflow regimes has resulted in their increased application in riverine research. Consequently, researchers are now confronted with the task of having to choose among a large number of competing hydrologic indices to reduce computational effort and variable redundancy prior to statistical analyses, while still adequately representing the major facets of the flow regime. The present study addresses this concern by providing a comprehensive review of 171 currently available hydrologic indices (including the commonly used Indicators of Hydrologic Alteration) using long‐term flow records from 420 sites from across the continental USA. We highlight patterns of redundancy among these hydrologic indices and provide a number of statistically and ecologically based recommendations for the selection of a reduced set of indices that can simultaneously (1) explain a dominant proportion of statistical variation in the complete set of hydrologic indices and (2) minimize multicollinearity while still adequately representing recognized, critical attributes of the flow regime. In addition, we examine the transferability of hydrologic indices across ‘stream types’ by identifying indices that consistently explain dominant patterns of variance across streams in varying climatic and geologic environments. Together, our results provide a framework from which researchers can identify hydrologic indices that adequately characterize flow regimes in a non‐redundant manner. In combination with ecological knowledge, this framework can guide researchers in the parsimonious selection of hydrologic indices for future hydroecological studies. Copyright © 2003 John Wiley & Sons, Ltd.     

1200LW-60大型泵低效原因浅析及改善措施探讨

1200LW-60大型蜗壳立式离心泵在下寨三级站的运行中出现经常性地流量衰减现象,致使水泵效率低下。作者通过长期观察分析,认为水泵流量衰减是进水水流紊乱所致,而水流紊乱与该站的进水形式有关,并提出了对该站进水形式进行改造的拙见。     

敖头闸坝渠首改造设计中的几个问题

以敖头闸坝渠首改造为例，分析有坝渠首改造的有关问题，提出有关建议。     

造粒硝铵装置改产硝酸铵钙

介绍硝酸铵钙的物化性能，采用硝酸铵与石灰石混和法生产硝酸铵钙的工艺流程，以及技术经济指标，硝酸铵钙用作肥料能增加养分种类，改善土壤品质，并具有适应性广等特点。是硝铵生产厂家一条很好的改产途径。     

资产的减值准备会计职业判断

通过对资产减值准备可以影响企业会计数据的介绍,说明合理运用会计职业判断来计提资产的减值准备是现代会计理论研究中的一个重要课题,应结合相关的法规、制度来共同规范。