弱膨胀性泥岩地区小型引水隧洞病害分析及加固

以贵州某水电站无压引水隧洞加固工程为例,针对弱膨胀性泥岩导致的隧洞侧墙变形开裂、顶拱岩块脱落、底板隆起等工程病害,结合工程所在区域的地质特点,通过试验和地质雷达等手段对隧洞围岩变形特征进行分析,明确了隧道围岩长期遭水浸泡,膨胀性围岩遇水膨胀是引发隧洞病害的主要诱因。采用三维数值模型,对隧洞膨胀性围岩遇水膨胀导致的隧洞侧墙应力应变分布特征进行模拟。拟定以排水、隔水为主,同时采用锚杆加固、对侧墙变形严重区段分块拆除重建的工程修复方案,并提出在实际施工过程中应注意隧洞侧墙逆止阀安装、隧洞侧墙拆除重建等施工工艺要求。本隧洞修复工程最终取得良好的实际运用效果。     

综述硫酸盐还原菌腐蚀的防护措施

介绍了防止硫酸盐还原菌腐蚀的几种措施,论述了“硫酸盐还原菌与脱氮硫杆菌的生物竞争淘汰法”防止SRB腐蚀的可行性.     

Electric Loading Simulation System for Missile Wings and Rudders

The design and the realization of missile wings and rudders loading simulation system based on digital signal processor （DSP） TMS320LF2407 and direct torque control （DTC） servo driver ACS600 are discussed. The structure and opration principle for the system are presented. Speediness and elimination of superabundant torque are two key difficulties for electric loading simulation system. The method which can eliminate the superabundant torque is researched. Test results show the airflow resistance when missile wings and rudders are spreading can be rapidly simulated with high accuracy.     

泌阳凹陷三维地震资料叠前噪声压制方法研究

针对泌阳凹陷地震资料的特点及目前实际生产中存在的问题,在叠前噪声压制方面提出了一些具体做法。通过对面波、声波的压制,线性干扰的自动识别和压制,单频干扰的压制,野值脉冲干扰的去除及随机干扰的压制,使资料信噪比有较大提高,从而在整体上提高了地震资料处理的精度。并提出不同地区资料应采用不同的方法,进行有针对性的处理,才能有效压制噪声。     

中国科技馆新馆工程消声方案论证

本文对迷宫式结构消声的设计选用的实际效果进行了实地噪声参数测量,对中国科技馆新馆的四个影院的消声方案进行了论证,并给出了建议。     

The formation and elimination of polymer bulges in CO2 laser microfabrication

CO₂ laser is a quick and cheap method for the fabrication of microfluidic chip. However, bulges will form at the rim of the laser ablation zone due to the thermal stress induced by great temperature gradient. The bulges will result in bonding problems, microchannels clogging and electrophoresis sample leak. The method to eliminate the bulges still requires further investigation. In this paper, the formation process of the bulges was recorded synchronously. The relationship between laser fabrication parameters and the height of bulge was established. The effects of the extruding direction of the plate on the forming of the bulge were evaluated. A simple method of “two times of laser cutting” is presented to eliminate the bulges. Results showed that the laser fabrication parameters, such as output power of laser beam and laser beam moving speed, have significant influence on the forming of bulge. The height of bulge also has relationship with the extruding direction of the commercial plate. The method of two times of laser cutting is an effective and simple way to eliminate the bulges.     

漆包线行业节能减排技术的发展

综述了近年来无(低)公害漆包线漆及涂线工艺技术的研究进展,并对漆包线生产设备及工艺在节能减排技术方面的应用做了简要介绍.     

海河防潮闸除险加固泄流规模分析

根据海河防潮闸现状过流能力复核成果及防洪排涝规划体系要求,从水工结构设计、施工技术的可能性和经济合理性,以及对闸下清淤工程、运行管理等方面的影响,分析除险加固的泄流规模。     

石嘴山氧化塘净化能力预测

本文的主要目的是预测石嘴山氧化塘在不同面积及水深情况下的净化能力。采用Wehner-Wilhelm设计方法,从预测的结果来看一、三方案净化效果最好,方案二可以满足现有污水量的处理要求。预测结果为氧化塘现在和将来的运行提供参考。最后,通过方案比较建议适时采取不同的方案。     

浅析龙滩水力发电厂安全创新管理

龙滩水力发电厂2007年5月21日首台700MW的水轮发电机组投产发电,2008年底龙滩一期工程共7台共4 900MW全部投产,至2011年3月21日,已连续安全稳定运行1 400d,未发生过人为误操作、人身轻伤及以上事故和设备损坏事故.文章主要以"责任制"为抓手,强化安全管理,狠抓标准化作业,加强重大危险源评估管理,...