钢厂热锯机噪声控制方案

某钢厂热锯机的工作噪声问题严重影响附近居民的日常生活，急需解决。根据其发声机理，通过采取对圆盘锯边缘开槽，安装吸隔声罩，对锯片增加阻尼材料，夹紧工件等措施取得了较好的降噪效果。     

现代电化学技术与环境保护

介绍了电化学技术在清洁工艺的开发、清洁产品的制备、废水与废气的处理、被污染土壤的修复和环境污染物监测方面的应用情况。电化学技术具有能量利用率高、经济实用以及污染物产生量少或污染物去除率高等特点，在环境保护领域具有广阔的应用前景。     

Effect of soil solids concentration in batch tests on the partition coefficients of organic pollutants in landfill liner-soil materials

 The effect of the soil solids concentration in batch tests on the measured values of the partition coefficient (K _p) of organic pollutants in landfill liner-soil material was investigated. Since this study was based on the results of batch and column tests conducted independently, there were limitations to the conclusions derived. The organic compounds tested were benzene, methylene chloride, toluene, trichloroethylene, and p-xylene. The results of this study showed that as soil solids concentrations increased, the measured K _p values of these organic compounds strongly decreased. The observed values of K _p stabilized when the soil solids concentration was above a certain value. Typical K _p values obtained from batch tests conducted under high soil solids concentrations were close to those obtained from column tests. It was concluded that the K _p values of organic compounds measured under low soil solids concentrations, i.e., less than 100 g/l, may not correctly simulate the field situation. Consequently, the values of K _p obtained with low soil solids concentrations can result in an overestimation of the retardation factor of the landfill liner material. Received: March 14, 2002 / Accepted: August 25, 2002     

准噶尔盆地油田开发区土地沙漠化防治研究--以石西、莫北油田为例

通过对准噶尔盆地石西油田、石南油田、莫北油田等开发利用区土地沙漠化现状和特点的分析，对油田开发活动引起的水土流失进行了预测，并对产生的新的土地沙漠化现象和水土流失对油田区道路、管线、油区的影响进行了分析，提出了针对钻井井场、道路、输油气管线等的分区防治措施。     

ANALYZING CORRELATIONS BETWEEN STREAM AND WATERSHED ATTRIBUTES1

ABSTRACT: Bivariate correlation analysis has been widely used to explore relationships between stream and watershed attributes that have all been measured on the same set of watersheds or sampling locations. Researchers routinely test H₀: ρ= 0 for each correlation in a large table and then go on to discuss only those that are declared “significant.” Such test results are inaccurate because no allowance is made for multiple testing, and also because the tests are not mutually independent. This paper reviews the Bonferroni approach to controlling the overall error rate in multiple testing and shows how the approach becomes impractical for large correlation tables. The Hotelling/Williams test is introduced for comparing two dependent correlations that share a variable, and numerical constraints for two such correlations are illustrated. References are also given for testing other hypothesized patterns among dependent correlations, and links to dependent correlation software are provided. The methods are illustrated for watershed and stream variables sampled in 23 small agricultural watersheds of the Willamette Valley, Oregon.     

1976年香港秀茂坪人工填土边坡滑坡灾害评析

简要介绍了1976年香港秀茂坪人工填土工程在强降雨后所发生的滑坡灾害,香港土木工程署当时根据滑坡 后的调查和试验研究,探讨了滑坡的起因,并提出了整治措施,为香港地区其它人工填土边坡的设计和施工提供了 有益的启示,也为类似滑坡的治理提供了参考依据。     

爆炸荷载作用下岩石的变形与破坏研究（I）

无论是矿山工程、隧道工程中钻孔爆破效率的提高、工程爆破领域爆破振动参数的预测，还是最近一系列高技术常规局部战争中粘地炸弹对地下坚固目标的破坏，在不考虑岩石中强爆炸引起的光子和电磁辐射等极端效应情况下，都亟待要求对岩石中爆炸引起的应力、变形及其它运动参数和破坏效应作出比较准确的评估。目前对此问题的研究尚只能达到大致的机理及景象的定性认识和描述，定量上的确定存在数量级的误差，尤其是爆炸和冲击的近区。误差更大。其原因在于岩石中爆炸产生的变形和破坏特征，不仅与作用时发生相应的物理及力学运动密切相关，而且强烈地受岩石自身构造缺陷水平及其变化的制约。本文概迷了爆炸作用下岩石的动力变形与破坏研究之现状。研究中考虑了岩石的构造特点及其对基本力学性状的影响，并简述了其研究的新趋向。     

土与结构相互作用体系振动台模型试验数值模拟研究(英文)

运用土与结构动力相互作用 (SSI)有限元三维分析软件 SASSI2 0 0 0对一个土与结构动力相互作用体系振动台模型试验进行了模拟计算。对振动台模型试验作了简单的介绍 ,并详细叙述了试验的建模方法。对于试验中的刚性地基和柔性地基条件 ,El- centro波、Taft波和 5 0年超越概率为 10 %的南京人工波等三种地震波输入 ,三个加速度峰值水平 0 .1g、0 .2 g、0 .3g及两个水平向地震波输入的各种组合工况均进行了计算。在数值计算中 ,假设地基土为覆盖于基岩上的半无限粘弹性水平成层土 ,采用等效线性模型考虑土的动力非线性的影响 ;上部结构用三维杆系有限元单元模拟 ,楼板用四结点壳单元模拟 ,每个结点有三个平动自由度和三个转动自由度 ,模型试验中所施加的人工质量均匀分布于壳单元上 ;基础视为平板基础 ,用八结点块体单元模拟 ,每个结点有三个平动自由度。将试验结果与计算结果进行对比较 ,结果表明 :计算所建立的模型较好地模拟了相互作用体系在地震荷载下的反应性状 ,计算结果与试验结果吻合较好 ,SSI效应对结构地震反应有很大影响     

黄土地基湿陷时桩的负摩阻力最大值出现深度研究

负摩阻力及中性点的定义表明,负摩阻力沿桩身(从桩顶两侧到中性点位置)的变化并不均匀,其间应存在一个最大值,最近的黄土地基浸水湿陷试验证明了这一点。本文利用该试验的资料,从理论上对桩的负摩阻力最大值出现深度进行分析研究,结果表明负摩阻力随深度的变化受到某一深度(如负摩阻力最大值处)以上土体有效重量和该深度桩周土体的有效沉降量这两个主要因素的制约,并由此推导出不同沉降性能土体湿陷时桩的负摩阻力最大值出现的深度。通过与实测资料的对比可见,本文提出的确定桩的负摩阻力最大值出现深度的理论是可信的,由此得到的计算黄土地基湿陷时桩身总的负摩阻力的方法更具合理性。     

渭河流域洪水灾害特征分析

分析了新中国成立以来渭河流域45次洪水灾害过程的年际变化、渭河不同河段及干支流洪水灾害特征；同时通过对致洪暴雨的时空分布、类型及灾害的分析，总结了导致渭河流域洪水灾害的降水特征。