一种自动冲水控制装置的开发和应用

介绍光电被动感应控制开关模块工作原理，研究开发了一种基于被动感应控制原理的自动冲水控制装置，总结比较了主动感应控制与被动感应控制的优缺点及其应用特点。     

Downstream Ecological Impacts of Controlled Sediment Flushing in an Alpine Valley River: A Case Study

Sediment flushing may be effective to tackle the loss of reservoir storage as a result of siltation. When operationally possible, the impact of this practice on the downstream aquatic environment can be mitigated by limiting the sediment concentration of the discharged waters (controlled sediment flushing). However, this topic is poorly documented, and concerns arise when limits are discussed. We present the results of a 3‐year field investigation concerning the controlled sediment flushing of a small reservoir on the Adda River, the main tributary of Lake Como—Italy. Two limits for suspended solid concentration (SSC) were adopted: 1.5 g L^?1, as average value throughout the whole working day, and 3.0 g L^?1, as alert threshold to adjust the ongoing activity. These constraints were essentially fulfilled in the course of the documented operations. The first year sediment flushing was more significant than the following year: 25 000 tons of fines below 2 mm in diameter were flushed in six non‐consecutive days in summer 2010, while, one year earlier, 75 000 tons were flushed in 16 non‐consecutive days. In the third year of investigation (2011), no sediment evacuation took place. The benthic macroinvertebrate and the fish communities were surveyed a short distance below the reservoir, that is, in the potentially more affected river reach. Clear pieces of evidence of environmental quality degradation were not detected; the adopted strategies can therefore be considered to be appropriate when planning sediment flushing management in comparable contexts. Copyright © 2014 John Wiley & Sons, Ltd.     

Achieving accurate and context‐sensitive timing for code optimization

Key computational kernels must run near their peak efficiency for most high‐performance computing (HPC) applications. Getting this level of efficiency has always required extensive tuning of the kernel on a particular platform of interest. The success or failure of an optimization is usually measured by invoking a timer. Understanding how to build reliable and context‐sensitive timers is one of the most neglected areas in HPC, and this results in a host of HPC software that looks good when reported in the papers, but delivers only a fraction of the reported performance when used by actual HPC applications. In this paper, we motivate the importance of timer design and then discuss the techniques and methodologies we have developed in order to accurately time HPC kernel routines for our well‐known empirical tuning framework, ATLAS. Copyright © 2008 John Wiley & Sons, Ltd.     

影响涂料印花增稠剂增稠及抗渗化性能的因素

讨论了反乳液聚合法合成涂料印花增稠剂时,影响聚合产物的抗渗化性能及增稠效果的主要因素。研究发现,提高聚合温度可以提高聚合产物的抗渗化性,但配制高粘度印花浆时对增稠效果不利,而在配制低粘度印花浆时则反之。降低交联单体用量有利于提高聚合产物的抗渗化性,并可提高聚合产物在配制较低粘度印花浆时的增稠效果。     

Three‐dimensional numerical modelling of the flushing process of the Kali Gandaki hydropower reservoir

Sediments filling reservoirs is a common problem in the world today, with an estimated 1% of the capacity of hydropower reservoirs being lost annually through sedimentation. One of the most used techniques for reducing this problem is reservoir flushing. During a flood, the water level is drawn down, causing increased velocities, therefore facilitating erosion and sediment transport. During the flushing, water from the reservoir will be lost, resulting in significant economic implications for the reservoir owner. The success of reservoir flushing depends on several parameters, including water discharge, sediment properties and reservoir geometry. This study describes the use of Computational Fluid Dynamics (CFD) as a modern method to predict the reservoir flushing process. A three‐dimensional numerical model (SSIIM 2), with an adaptive, non‐orthogonal and unstructured grid has been used. Through the application of special modified algorithms (e.g., wetting/drying, free water surface), numerical modelling of sediment movement can be an alternative for planning and optimizing the flushing process for complex reservoir geometries. The numerical model was tested against data from a physical model study of the Kali Gandaki hydropower reservoir in Nepal. The total quantity of flushed out sediments, and the bed deformation in six cross‐sections, were compared, highlighting a good correspondence between the results. These include the cross‐sectional shape of a 90‐degree bend, for which secondary currents influenced the results. The study indicates that numerical models might become a useful tool for reservoir flushing predictions.     

发电机内进油的事故原因分析及预防对策

描述了发电机密封油系统的组成、功能和特点,总结了近几年密封油系统调试的经验,分析并指出密封油进入发电机内的各种可能原因,提出事故发生后的及时处理措施,以及预防此类事故再次发生的对策,这对于今后各种类型机组的密封油系统的油冲洗、调试、运行和维护,都具有重要的指导和借鉴作用。     

东庄水库蓄清排浑运用对维持有效库容的作用

在设计水沙系列及拟定的运用方式下,通过实体模型试验研究了水库蓄清排浑运用条件下的水沙运动规律、排沙特性及库区纵横剖面形态和库区淤积量的变化过程。试验结果表明,系列年运用试验结束后,库区总淤积量为5.21亿m3,770m高程以下有效库容为10.24亿m3,占总库容的81.27%,说明蓄清排浑是东庄水库维持有效库容的有效运用方式之一。     

热洗清蜡工艺技术对比研究及应用

油井的清蜡问题一直是采油工艺的难题。采用热洗的方法进行清蜡是国内各油田广泛使用的工艺技术。通过对套管反洗、套管短路反洗、套管温控反洗、空心抽油杆正洗等热洗工艺技术进行对比分析,提出各种工艺技术的优缺点和适应范围。对现场使用效果较好的空心抽油杆正洗工艺技术和配套井下工具进行优化设计,并在现场进行试验,取得了较好的效果。应用效果显示,空心抽油杆正洗工艺技术可以解决低压、低渗、高含蜡等特殊油田的清蜡问题。     

综放工作面垮落带高度测定方法研究

为解决高瓦斯矿井综放工作面垮落带高度难以精确测定,造成工作面两端头难维护、预抽钻孔终孔位置难以确定等问题,依据工作面采动后顶板岩层破断垮落、弯曲下沉对采空区煤层底板施加压力的情况,结合采空区上覆各岩层的厚度和密度,提出了垮落带发育高度的测定方法。以大平矿N1S2综放工作面为例,现场测试结果表明：利用该测定方法测得的垮落带高度为88.65 m,钻孔冲洗液法测得的垮落带高度为88.20 m,二者绝对误差仅为0.45 m。     

强磁选矿机PLC程序设计

介绍了强磁选矿机的结构与原理以及强磁选矿机控制的具体要求,并根据要求编写了PLC的流程图和控制程序.