高压注水在综放工作面的应用

介绍了综采煤层注水软化工艺的原理 ,钻孔布置方法以及生产实际中的应用情况     

黄河下游平滩流量对来水来沙变化的响应

本文探讨了平滩流量对来水来沙的滞后响应规律，发现平滩流量不仅与当年的水沙条件有关，而且与前期水沙条件有关，是一定时期内的水沙条件累积作用的结果。当采用滑动平均值来反应前期水沙条件的累积影响时，得出平滩流量与滑动平均汛期流量和滑动平均来沙系数的相关程度分别在4年和5年时达到最大值。据此建立了能够反映来水流量和来沙系数前期综合影响的平滩流量计算方法，可以用来估算黄河下游主要测站平滩流量随水沙条件的变化。     

Flood frequency and routing processes at a confluence of the middle Yellow River in China

Floods cause environmental hazards and influence on socio‐economic activities. In this study, we evaluated the historic flood frequency at a confluence in the middle Yellow River, China. A non‐parametric, multivariate, empirical, orthogonal function matrix model, which consists of time correlation coefficients of flood discharge at different gauge stations and flood events was used for the analysis of flood frequency. The model addresses the characteristics of confluent floods such as frequency and the probability in multiple tributary rivers. Flood frequency analysis is often coupled with studies of hydrological routing processes that reduce the flood capacity of the rivers. Flood routing to the confluence were simulated using kinematic wave theory. Results of this flood frequency analysis showed that flooding frequency has intensified in the past 500 years, especially during the 19th century. Flooding in streams above the confluence was more frequent than in streams below the confluence. Over the last 2000 years, concurrent flooding in multiple tributary rivers accounted for 67.5% of the total flooding in the middle Yellow River. Simulation of flood routing processes shows that the decreased flooding capacity and elevated river bed of the shrunken main channel leads to an increased flood wave propagation time (24–52.3 h) in the study area after 1995. The model indicates that human activities, such as constructions of the Sanmenxia Dam, have changed flood routing boundary conditions and have contributed to the increased flood frequency at the confluence. Copyright © 2007 John Wiley & Sons, Ltd.     

A new type of arc plasma reactor with 12-phase alternating current discharge for synthesis of carbon nanotubes

A new type of arc plasma reactor with 12-phase alternating current (AC) discharge for synthesis of carbon nanotubes (CNTs) is proposed. A couple of six discharge electrodes by which have mutually electrical connection between them to enlarge the high-temperature regions in the reactor are arranged to three-dimensional locations. A new method of CNTs fabrication by this reactor, which accomplishes to enlarge the suitable growth region in high purity and at high yield, was developed.     

葛洲坝水利枢纽泄洪、冲砂闸金属结构防腐技术研究

葛洲坝泄水闸金属结构部分长期处于水下及潮湿的环境中,表面锈蚀严重,尤其是弧形工作门及侧轨处于水下,启闭频繁,受高速挟沙水流的冲磨、气蚀、摩擦作用,以及工作门侧止水的挤压、出现局部厚度减薄、表面冲槽及蚀坑等缺陷,为了确保枢纽工程的安全运行,延长其金属结构的使用寿命,须采取有效的防腐措施.葛洲坝泄水闸金属结构部分在解决防腐问题中不断进行新技术、新材料和新工艺的探索和研究,取得了一定成效.本文就其防腐技术的研究成果加以概括总结,希望能对同类工程提供有益的借鉴和帮助.     

浍河水库泄洪洞结构优化研究

根据有限元计算原理，结合山西临汾地区浍河水库泄洪洞，对土坝下的大型软基涵洞分层填土施工过程和蓄水对结构的影响进行了模拟计算，得到了更贴近实际的涵洞结构内力和涵洞土压力分布规律，并根据实际地基条件及现有涵洞的两种常见的结构形态对涵洞结构形式进行了优化，其成果已用于设计和施工，证明了该研究方法的科学性和结论的正确性。     

丹江口工程大坝加高后的几个水力学问题

依托1∶100水工模型试验成果,重点介绍了丹江口大坝加高后的几个水力学问题如泄流能力、坝面压力特性、河床局部冲刷、下游河道流速流态、泄洪对电厂及航运的影响等.研究显示:大坝加高后泄流能力可满足设计要求,坝下河床冲刷加重,挑距加远,设计洪水22 300 m3/s时坝下冲坑最低点高程为43.0 m,各级泄量冲坑上游坡均缓于临界坡,也略缓于初期工程同级流量冲坑的上游坡;坝下600 m以内为护岸工程重点防护段,岸边流速为5.8～9.8 m/s;泄洪对丹江口电厂影响较小,对自备电站不利影响较为显著;最大通航流量6 200 m3/s时下游引航道口门区流态复杂,水流较混乱.     

台式毛细管放电X光激光装置调试实验

对自行研制的台式毛细管放电X光激光装置进行了系统调试,在充氩气毛细管负载下,输出电流38kA,电流脉冲前沿40ns,并对有关问题进行了讨论.并在这个装置上开展充氩气毛细管放电荧光光谱实验研究.     

非化学计量LaNi5型储氢合金的性能

采用富La混合稀土与Ni、Co、Mg等元素组合，获得了一种非化学计量LaNi5型储氢合金、用金相、XRD和SEM-EDX等方法分析了该合金的组织结构，研究了合金的气相储氢特性以及电化学性能，结果表明：在1.6MPa氢压和温度29℃下，该合金的储氢量达到1.58%（质量分数），该合金的放电容量为380mAh/g。经300次循环后容量保持率为55%，该合金的基体是CaCu5型结构的LaNi5相，但有第二相（LaMg)Ni3析出，这种第二相的形成是导致该合金大容量的关键。