Study on Deep Well Dewatering Optimization Design in Deep Foundation Pit and Engineering Application

Based on analyses of the theories of groundwater unsteady flow in deep well dewatering in the deep foundation pit,Theis equations are chosen to calculate and analyze the relationship between wa-ter level drawdown of confined aquifer and dewatering duration.In order to reduce engineering cost and diminish detrimental effect on ambient surrounding,optimization design target function based on the control of confined water drawdown and four restriction requisitions based on the control of safe water level,resistance to throwing up from the bottom of foundation pit,avoiding excessively great subsidence and unequal surface subsidence are proposed.Adeep well dewatering project in the deep foundation pit is optimally designed.The calculated results including confined water level drawdown and surface subsid-ence are in close agreement with the measured results,and the optimization design can effectively control both surface subsidence outside foundation pit and unequal subsidence as a result of dewatering.     

试论新形势下地震科技资料的服务工作

科技资料服务工作是一个满足读者需求的过程，通过读者对科技资料的利用将知识转化为生产力。该文分析了天津市地震局地震科技资料历年的借阅情况，提出了在新的形势下如何搞好地震科技资料的服务工作。     

Four Chinese Sulfide Mineral Reference Materials: Preparation and Certification

Four sulfide mineral reference materials, pyrite GSM-1, chalcopyrite GSM-2, galena GSM-3 and sphalerite GSM-4, have been prepared by the Institute of Rock and Mineral Analysis for collaborrative studies on their chemical composition. This paper describes the sample collection, preparation, homogeneity testing and interlaboratory certification of these samples. Some features with regard to the purification, pulverisation, stability and storage of sample are also discussed. The samples have been approved as certified reference materials by the State Bureau of Technical Supervision of China in April 1995.     

The African Climate as Predicted by the IAP Grid-Point Nine-Layer Atmospheric General Circulation Model (IAP-9L-AGCM)

ＴｈｅＡｆｒｉｃａｎＣｌｉｍａｔｅａｓＰｒｅｄｉｃｔｅｄｂｙｔｈｅＩＡＰＧｒｉｄ－ＰｏｉｎｔＮｉｎｅ－ＬａｙｅｒＡｔｍｏｓｐｈｅｒｉｃＧｅｎｅｒａｌＣｉｒｃｕｌａｔｉｏｎＭｏｄｅｌ（ＩＡＰ－９Ｌ－ＡＧＣＭ）ＣｈｉｎｅｋｅＴｈｅｏＣｈｉｄｉｅｚｉｅ①，...     

The Interannual Variability and Predictability in a Global Climate Model

ＴｈｅＩｎｔｅｒａｎｎｕａｌＶａｒｉａｂｉｌｉｔｙａｎｄＰｒｅｄｉｃｔａｂｉｌｉｔｙｉｎａＧｌｏｂａｌＣｌｉｍａｔｅＭｏｄｅｌ①ＷａｎｇＨｕｉｊｕｎ（王会军），ＸｕｅＦｅｎｇ（薛峰）ａｎｄＢｉＸｕｎｑｉａｎｇ（毕训强）ＬＡＳＧ，Ｉｎｓｔｉｔｕｔｅｏｆ...     

The effect of heating anomaly on the Asian circulation—A GCM experiment

A numerical experiment was done by using the IAP 9-Level AGCM to study the effects of radiation anomaly over East Asia on the Asian general circulation. The results show that the changes of Asian summer general circula-tion are remarkable in the Indian and China southwest monsoon, precipitation in India and the Yellow River and Huaihe River valley in China and area around the north Japan, the easterly anomaly of low-level zonal wind in the tropical Pacific and so on.     

冻土区甲烷排放研究进展

冻土区土牡表面和活动层土的ＣＨ_４排放和吸收表现出强烈的时空变化性。根据多年冻土中ＣＨ_４含量的模拟结果表明，全球尺度上，平均每米厚度多年冻土含有ＣＨ_４６５Ｔｇ。在未来的２００年间，多年冻土融化所导致的大气ＣＨ_４附加年源强变化于２～２５Ｔｇ。     

气候变化国家评估报告（Ⅰ）：中国气候变化的历史和未来趋势

 中国的气候变化与全球变化有相当的一致性，但也存在明显差别。在全球变暖背景下，近100 a来中国年平均地表气温明显增加，升温幅度比同期全球平均值略高。近100 a和近50 a的降水量变化趋势不明显，但1956年以来出现了微弱增加的趋势。近50 a来中国主要极端天气气候事件的频率和强度也出现了明显的变化。研究表明，中国的CO2年排放量呈不断增加趋势，温室气体正辐射强迫的总和是造成气候变暖的主要原因。对21世纪气候变化趋势做出的预测表明：未来20～100 a，中国地表气温增加明显，降水量也呈增加趋势。     

北京市冬季采暖气候条件分析

根据国家有关规范中关于采暖气候条件的规定，通过对北京城、近郊5个气象台站近40年的气象资料的分析发现：①近年来采暖终日较传统终日有明显提前的趋势；②采暖期长度有缩短的趋势；③由于近年气候变暖，采暖强度明显减弱；④室外计算温度比现在采用的-9℃高1℃。     

冬季太平洋海温变化对中国5月降水的影响

本文采用EOF-CCA方法研究了12-2月份北太平洋海温场与中国5月降水指数之间的相关关系。研究结果表明：12月海温与中国5月降水有较好的相关关系。赤道东太平洋和日本以东洋面的海温与中国东部地区的降水正相关，与中国华南、云南和西部地区的降水负相关。相反，东北太平洋、菲律宾以东洋面和墨西哥以西洋面的海温与中国东部地区的降水负相关，与中国华南、云南和西部地区的降水正相关。上述5个海区的太平洋前期海温对中国5月降水有影响的海温关键区。前期海温异常将影响到5月中高纬度的西风带波动和低纬西太平洋副热带高压的强度、位置、从而导致中国5月降水空间分布的异常。