西藏聂拉木地区纳兴组深切谷充填序列特征及意义

西藏聂拉木地区纳兴组深切谷充填序列特征及意义李祥辉，王成善（成都理工学院，成都６１００５９）关键词充填序列，深切谷，纳兴组，亚里，聂拉木研究区纳兴组下部深切谷体系发育于西藏南部珠穆朗玛峰与希夏邦马峰之间地区，剖面位置西距希夏邦马峰约３５ｋｍ，位于聂拉...     

预富集柱—离子色谱法测定高纯水中痕量氟和氯

在国产离子色谱仪上加装填充有季铵型阴离子交换剂的预富集柱，所设计的流路和方法可将测定Ｆ－和Ｃｌ－的检出限分别降至０１７μｇ／Ｌ和０２７μｇ／Ｌ。测定精密度好，ＲＳＤ＜５％，方法满足反应堆堆芯冷却水中痕量Ｆ－和Ｃｌ－的检测要求。     

上海外高桥电厂一期工程综合试桩

上海外高桥电厂一期工程装机容量4×300MW,4台机组已于1997年8月前陆续并网发电,运行情况良好。电厂主要建(构)筑物采用钢管桩,通过岩土工程勘察和多种原位测试及工程试桩,对桩基方案进行了优化,为国家节约了大量费用。     

磷酸三丁酯减压微色谱柱分离锡的研究和应用

研究了磷酸三丁酯（ＴＢＰ）减压微色谱柱分离富集Ｓｎ的条件和性能。选定３ｍｍ×７０ｍｍ的微色谱柱，树脂粒度１２０～１４０目，测得静态吸附容量为２７ｍｇ／ｇ，吸附反应速率常数为３６８×１０－３；减压条件下，在１ｍｏｌ／ＬＨＣｌ介质中Ｓｎ被萃取在ＴＢＰ微色谱柱上，用２ｍＬ２ｍｏｌ／ＬＨ２ＳＯ４洗脱后即可用邻氯苯基荧光酮Ｔｗｅｅｎ２０分光光度法测定Ｓｎ含量。经标准样品验证，分离效果好，适于矿样中微量Ｓｎ测定     

高效液相色谱中有效理论塔板数的变量因素和柱效率的研究

研究了高效液相色谱（ＨＰＬＣ）、高效离子色谱（ＨＰＩＣ）、高效离子排斥色谱（ＨＰＥＩＣ）和低压离子色谱（ＬＰＩＣ）中有效理论塔板数的变量因素，提出了能定量表述柱分离效率的参数──柱效率Ｓ及其计算方法。给出了其它色谱参数（分离度Ｒｓ，分离系数α和容量因子Ｋ＇）与有效理论塔板数及柱效率相关的实验结果。     

A Sensitivity Study of Single Column Model

A single column model (SCM) is constructed by extracting the physical subroutines from the NCAR Community Climate Model version 1 (CCM1).Simulated data are generated by CCM1 and used to validate the SCM and to study the sensitivity of the SCM to errors in its input data.It is found that the SCM temperature predictions are moderately sensitive to errors in the input horizontal temperature flux convergence and moisture flux convergence.Two types of error are concerned in this study,random errors due to insufficient data resolution,and errors due to insufficient data area coverage.While the first type of error can be reduced by filtering and/or increasing the data resolution,it is shown that the second type of error can be reduced by enlarging the data area coverage and using a suitable method to compute the input flux convergence terms.     

REMOTE SENSING OF THE SEASONAL VARIATION IN COLUMN ABUNDANCE OF ATMOSPHERIC CH_4

Infrared solar spectra on clear days were measured automatically by an infrared solarspectrometer(ISS)with 0.4 cm~(-1) resolution developed by us.A line-by line(LBL)computationmethod was used to calculate theoretical atmospheric absorption.In the wavelength range of 3.410—3.438 μm.the absorption is mainly due to atmospheric methane and water vapor.Columnatmospheric methane was retrieved from the recorded infrared solar spectra.The seasonal variationof column atmospheric methane in Hefei has been obtained from the measuremental data of nearly18 months since the April of 1997.and found that it is similar to that of background data.Theinstruments.principles of measurement and some of results were introduced,and the results arealso discussed briefly in the paper.     

原位载荷试验在优化土质地基基础设计中的作用

城市土质地基越来越多,但对土质地基承载力的正确认识还不够,合理地利用土质地基既安全又经济。通过几个建筑工程设计变更实例,强调了原位承载力试验的必要性,论述了土质地基承载力特征值取值合理性问题,分析了目前在对土质地基勘察设计中存在的问题。     

Ground motion amplification at flange level of bushings mounted on electric substation transformers

A study was conducted to quantify the ground motion amplification that takes place at the base of bushings mounted on electric substation transformers as a result of the flexibility of the transformer tank and turrets to which they are connected. This study was undertaken to assess the adequacy of the amplification factor of 2.0 specified by the Institute of Electrical and Electronic Engineers in Standard IEEE 693‐1997 for the seismic qualification of transformer bushings. The study included field tests of typical 500‐kV transformers to obtain experimentally their natural frequencies and damping ratios, the development of simple analytical models that closely matched the experimental data, and the calculation of the transformers' dynamic response under different earthquake excitations using these analytical models. Amplification factors were then computed for each of the excitations considered, defining these amplification factors as the peak shear force at the base of the bushings over the corresponding shear force obtained when the bushings are assumed mounted directly on the ground. It is found that the amplification factors for the 500‐kV bushings are within the amplification factor of 2.0 specified by Standard IEEE 693, but not those for the 230‐kV bushings, which exceed the IEEE 693 amplification factor by almost a factor of two. Copyright © 2001 John Wiley & Sons, Ltd.     

Response of single piles and pipelines in liquefaction-induced lateral spreads using controlled blasting

Two full-scale experiments using controlled blasting were conducted in the Port of Tokachi on Hokkaido Island, Japan, to assess the behavior of piles and pipelines subjected to lateral spreading. Test specimens were extensively instrumented with strain gauges to measure the distribution of moment during lateral spreading. This allowed us to compute the loading condition, as well as to conduct damage and performance assessments on the piles and pipelines. This paper presents the test results and discussions on the response of single piles and pipelines observed from the full-scale experiments. Based on the test results, it can be concluded that using controlled blasting successfully liquefied the soil, and subsequently induced lateral spreading. The movements of the single pile, as well as the transverse pipelines, were approximately the same as the free field soil movement. Observed moment distribution of the single pile indicated that global translation of the liquefied soil layer provided insignificant force to the pile. In addition, the degree of fixity at the pile tip significantly affected the moment along the pile as well as the pile head displacement. The pile with a higher degree of fixity at the pile tip had smaller pile head displacement but larger maximum moment.