GPS时间比对机对天文预测图像的时间定标

本文介绍了GPS时间比对机利用GPS时标为基准 ,对天文图像进行时间定标的设计原理、可能出现的各种差错和纠正方法、模拟实验和主要误差分析。时间定标精度为 1 .0 85微秒 ,其均方根为 0 .5 4微秒     

生物成因煤层气的生成及其资源意义

生物成因煤层气一般可分为原生和次生生物成因，它们在生成机理上有许多相似之处，但也有所不同，导致后期保存和同位素组成上的差异。研究指出，原生生物成因气不能被大量保留在煤层中，气田中的生物成因气多为次生生物成因气；次生生物成因煤层气分布比较普遍，含量较为丰富，且生物成因煤层气埋藏深度浅，勘探成本低，因此次生生物成因煤层气具有不容忽视的巨大资源潜力。     

Determination of the elastic wave velocities in porous rocks with the change of overburden pressure and its universal significance

Typical rock samples with different lithologic characteristics were collected from exploring wells drilled in sandstone-conglomerate sedimental reservoirs with positive rhythm. In different pore fluid states (fully saturated with gas, water and oil), the velocities of compressional and shear waves (Vp, Vs) were measured under different overburden pressure in laboratory. The effects of pore fluid and different fluid types on the velocities were analyzed. The velocities (Vp, Vs) of the samples fully saturated with water were calculated by use of Gassmann's formula that is suitable for low frequency. The calculated values were compared with the experimental values obtained at high frequency. The result shows that Gassmann's theory can be used to calculate elastic wave velocities in porous rocks saturated with fluid. By this result, the change of elastic velocities with the change of fluid can be predicted. The error is allowable in petroleum engineering. This conclusion is useful for sonic logging interpretation and seismic datum processing.     

核废料管理体系的成本评估

本文回顾了１９８３－１９８９年期间美国能源部ＴＳＬＣＣ分析报告的演变过程，分析了ＴＳＬＣＣ分析报告中总成本的变化趋势，并简要地介绍了一种ＯＣＲＷＭ开发的成本分析方法。     

泗阳县黄河故道滩区综合开发模式研究和实践

1989年以来,泗阳县运用系统工程的方法,对黄河故道滩区洪涝沙碱旱的综合治理和滩区三荒资源的综合开发利用进行了研究和实践,创立了黄河故道滩区综合开发模式,缩短了开发周期,提高了开发效益,为黄淮流域季节性沙土河道滩区的治理开发树立了一个典范。     

水文地质及灾害地质监测新仪器介绍

本文介绍了地下水监测和滑坡监测的两种新型仪器。ＷＬＴ－１０２０地下水动态监测仪器的突出特点是高分辨率、长期稳定、微功耗、全自动工作。ＨＹＪ－３００８滑坡诱发因素监测仪通过监测滑体内的水分变化来预测预报暴雨滑坡。