阻尼减震结构反应谱法计算若干问题

讨论了反应谱法计算减震结构所存在的主要问题,指出单纯使用加速度反应谱是不够的,提出联合采用加速度谱、速度谱和位移谱才能较好地分析阻尼减震结构。文中示例计算表明,采用线性阻尼器的减震结构,在阻尼器分布较均匀且阻尼比不大时,可以近似采用加速度谱、速度谱和位移谱来计算。     

ESTIMATING RECHARGE FOR BRITISH AQUIFERS

This paper reviews methods of estimating recharge for a wide variety of aquifers in Britain. A soil moisture balance technique is used with direct representation of relevant soil and crop properties. Recharge contributions due to rainfall, runoff from impervious areas and leaking water mains and sewers are considered. In many field situations low permeability strata, which overlie the main aquifer, modify the timing and magnitude of the actual recharge. Runoff from less permeable strata can become runoff-recharge at the aquifer outcrop. Reference is made to several case studies.     

上海地区第Ⅰ层承压水可持续回灌试验

由于水质问题,上海地区的第I层承压水很难实现持续稳定回灌。介绍了将抽出的承压水经曝气、沉淀后持续回灌的试验,明显看出除铁离子和沉淀物的效果非常好,实现了30d的稳定回灌。     

煤矸石对混凝土碱硅酸反应损伤的抑制作用

在具有潜在碱硅酸反应(ASR)的混凝土中掺入煤矸石,测定了在单一碱(NaOH)作用以及在NaOH NaCl耦合作用下混凝土膨胀率和相对动态弹性模量的变化,对比研究了掺与未掺煤矸石混凝土发生ASR损伤的过程与规律.结果表明,煤矸石对单一碱(NaOH)以及NaOH NaCl复合引起的混凝土ASR损伤均有较好的抑制作用.另外,就上述抑制作用的机理进行了分析.     

DT-RO处理垃圾渗滤液工程介绍

重庆长生桥垃圾卫生填埋渗滤液处理工程,是我国第一座采用碟管式反渗透(DT-RO)技术处理的工程。在半年多的运行中,该系统效能高且稳定。CODCr、TOC和电导率去除率均在99%以上,NH3-N去除率达98%,Ca2+、Ba2+、Mg2+截留率均在99.9%以上,出水中未检出SS。浓缩液回灌于垃圾填埋场,形成回灌型生物反应器。     

延津县下新近系热储层回灌水运移规律数值模拟研究

河南省东部新生界沉积盆地新近系—古近系形成巨厚的砂岩、泥岩孔隙、裂隙型热储层,是目前河南省地热开采的主要目的层。采用Tough2数值模拟软件,研究了不同回灌率下温度场变化、抽水井出水温度降幅与抽回灌井间距关系,氯离子运移距离与回灌率关系以及热储背景压力水头降幅与不同回灌率工况关系。研究可为地热对井采灌提供示范,为地热资源开发、保护和有效管理提供依据,从而促进地热资源的可持续开发。     

延津县下新近系热储层对井采灌试验研究

为了给地热对井采灌提供示范,为地热资源开发、保护和有效管理提供依据,促进地热资源的可持续开发,研究了延津县下新近系热储层对井采灌试验。研究得出,研究区地温梯度为3.0～3.5℃/hm,延津县城一带由于新乡—商丘断裂的导热作用,地温梯度高于3.5℃/hm,热储水化学类型为Cl-Na型。热储层中存在裂隙或破碎带(高渗通道),热储层的连通构造曲折复杂,但热储层中裂隙不发育;通过分析地热流体的单井回灌试验和生产性对井采灌试验监测数据,总结地热回灌工艺流程及回灌量衰减规律,分析其原因并提出对策。研究可为河南省地热实现对井回灌—开采提供示范和指导。     

压缩空气动力汽车加气站的设计

提出了为零排放清洁汽车——压缩机空气动力汽车提供快速加气服务的加气站的设计方案,讨论了加气站主要设计参数,并在此基础上对小型加气站进行试验研究,成功地实现了为实验型气动汽车进行快速加气。     

Estimation of power outage size based on the dominating differential equation

This paper describes a method to estimate how much power will drop after severe generation outage. When a large generation outage occurs, system frequency plummets to an unacceptable frequency level. Frequency drop affects both customers and generation systems. Thus adequate and quick load-shedding must be done to prevent problems. To institute any load-shedding policy effectively, the size of the generation outage must be precisely estimated in a very short time. So far, several methods have been proposed to estimate the power outage amount by measuring the decaying frequency variations that are obtained at each local bus. These methods are easily applied, but cannot be expected to provide good results in real power system operations because of the noises that are a part of decaying frequency variations. To cope with this problem, a new estimation method based on one that uses the dominating differential equation is proposed in this paper. The most precise estimation at this point is obtained by using additional factors, such as the sine wave included in the decaying frequency fluctuations and considered as a part of the equation. Simulation studies on a model power system consisting of five generating stations and four load points show that the newer method is encouraging. © 1997 Scripta Technica, Inc. Electr Eng Jpn, 118 (3): 39–49, 1997     

利用澳大利亚含水层补给管理国家指南 对黄水河地下水库的评估研究

本文介绍了澳大利亚含水层补给管理(含水层补给管理简称MAR )国家指南,使用其评估方法和程序对我国典型MAR项目黄水河地下水库进行初级评估。依次进行的可行性评价、难度评价、最大风险评价和残余风险评价结果表明该项目风险较低,可以正常运行,与实际运行状况相吻合。本研究对类似MAR项目的评估和建设运行能够起到良好的借鉴作用。