波斯湾油气风云与中国中西部油气开发   总被引：4，自引：3，他引：4  

刘和甫  李小军  刘立群 《现代地质》2003,17(2):187-193

波斯湾盆地与中国中西部盆地同属特提斯构造域 ,有着类似的演化特征 :早期离散期形成裂谷盆地 ;中期漂移期形成克拉通盆地 ;晚期聚合期形成前陆盆地 ,构成大型叠合盆地。克拉通盆地内同期隆起有利于油气的早期运移富集 ;前陆盆地内褶皱—冲断带发育 ,裂隙常构成良好的储层形成晚期油气藏 ;构造枢纽带常构成油气富集带 ;碳酸盐—蒸发岩层序中孔隙—溶洞—裂缝构成完整的储集—渗滤体系 ,在总体上形成复合油气系统。中国中西部油气勘探新区应重视碳酸盐台地与碎屑重力流盆地之间的枢纽带。  相似文献   

潜孔锤多工艺钻进在水文水井及工程中的应用   总被引：1，自引：0，他引：1  

蒋荣庆  殷琨 《水文地质工程地质》1998,25(6):51-54

文章分析了潜孔锤钻进技术的优缺点,提出了根据不同地质条件及工程要求,研究与其它的先进钻进工艺方法相结合,克服该方法自身存在的某些缺点,形成了潜孔锤多工艺钻进方法,不仅拓宽了潜孔锤的使用领域,实践证明它发挥了其它钻进方法无法比拟的作用。  相似文献   

PSTN可视电话中V.80协议的研究与实现   总被引：1，自引：0，他引：1  

喻占武  李锐  胡瑞敏 《武汉大学学报(信息科学版)》2002,27(1):17-22

介绍了PSTN可视电话和V．80协议的基本原理，针对甚低带宽的PSTN线路特点，实现了一种有效的同步传输控制模型，改进了H．324可视电话的性能，实现了与其他符合H．324国际标准的可视电话的良好互通性。  相似文献   

HG-1C型航空光谱辐射计   总被引：1，自引：0，他引：1  

黄鲁  汪元钧  汪宗辉  张运杰  刘书珍  洪津 《安徽地质》1997,(1)

本文介绍了ＨＧ－１Ｃ型可见波段航空光谱辐射计工作原理、总体结构和技术指标，阐述了仪器的光学系统结构和数据采集系统的硬件电路原理，说明了仪器的软件流程和光谱数据处理功能  相似文献   

Asynchronism-synchronism of regional precipitation in South-to-North Water Transfer planned areas     

ZHENG Hong-xing  LIU Chang-ming 《地理学报》2001,11(2):161-169

This paper proposes a method on analyzing the asynchronism-synchronism of precipitation of different hydrological regions regarding the S-to-N water transfer areas of eastern China. The general process of the analysis includes three steps. Firstly, we created the rainfall series of the region concerned by calculating the regional average rainfall of the stations in the area with the help of the classical Thiessen Polygon method. Secondly, the standards of assessment indices for wetness or dryness are set according to Gamma distribution function with a certain probability P 37.5% or 62.5% given respectively. Finally, the frequency of nine combinations are counted as the quantitative feature of asynchronism and synchronism in three time scales, that is the yearly, seasonal and monthly scales. The asynchronism-synchronism of two region pairs has been estimated. The results show that the frequency of precipitation asynchronism in 1957-1998 is larger than the synchronism frequency for both the North China-middle and lower Yangtze River pair and for the North China-upper Hanjiang River pair. As for the synchronism phenomena, the frequency of Nd-Sd is rather low. As the combinations that are suitable for water transfers are Nd-Sw, Nn-Sw, Nd-Sn and Nn-Sn, the total frequency of these combinations for North China-middle and lower Yangtze River is 40% on an annual basis, but only 28% in spring when water shortages are most likely to occur. The total frequency of these combinations for North China-upper Hanjiang River is about 24% on an annual basis, but 35% in spring and winter. It should be noted that if future precipitation patterns are similar to that of the period 1957-1998, it is very important to change the natural character of asynchronism-synchronism by enhancing the capability of hydro-projects regulation and improving management of the water transfer project.  相似文献   

太阳射电频谱仪数据采集与处理(自相关频谱仪原理与应用)     

金振宇 《天文研究与技术》2000,(1)

本文论述了 0 .7～ 1 .4GHz太阳射电频谱仪数据采集与处理系统是如何实现的。正在研制的此仪器采用了多通道频谱仪与自相关频谱仪结合使用的方案。首先 ,本文详细讨论了自相关频谱仪的原理 ,并介绍了北京大学研制的自相关频谱仪的结构。在此基础上着重讨论了多通道频谱仪与自相关频谱仪的同步控制的解决方案 ,以及大容量数据采集实时存盘的解决方案。最后 ,介绍了我们为数据预处理采用的一些方案。  相似文献   

空气跟管钻进在南苏丹供水井流沙层中的应用实践          下载免费PDF全文

周作明 《探矿工程》2017,44(4):36-38

在南苏丹供水井钻探施工过程中,遇特别松散的流沙层,常规的泥浆护壁钻进难以成孔。简要介绍了在南苏丹供水井施工现场制作简易同步回转拨杠实现空气跟管钻进的基本原理与工作程序,有效地解决了流沙层的钻进成孔问题。并针对这一技术应用过程中存在的问题,提出了改进建议。  相似文献   

Investigations du caractère multifractal des débits maximaux annuels de crue / Investigation of multifractality of maximum annual flood discharges     

《水文科学杂志》2013,58(4)

Abstract

Abstract The multifractal analysis of maximum annual flood discharges at 55 stations of the Tunisian gauging network allows one to associate the various statistical moments of surface discharges of the basins through a scale-invariant law. On this basis, a random cascades model is identified. The scale-invariant law obtained for extreme values represents a theoretical foundation for empirical models proposed since the 1960s which link extreme values, and their associated hazards, with surfaces of drainage areas.  相似文献   

Real-Time Synchronous Integration of Radar and Raingauge Measurements Based on the Quasi Same-Rain-Volume Sampling          下载免费PDF全文

WAN Yuf  WU Cuihong  JIN Hongxiang 《Acta Meteorologica Sinica》2010,24(3):340-353

A technique for real-time synchronous integration of radar and raingauge measurements based on the concept of the quasi same-rain-volume sampling(QSVS)is presented.Because of the temporal and spatial discrepancies and resolution differences,the integration of radar measurements with raingauge observations has long been a difficult task.Observations indicate that there exists a correlation that conforms to the power law between hourly accumulated raingauge measurement(QG)and detected radar echo(ZOH)over the raingauge.On the basis of this,a concept of the QSVS and five direct correspondent formulas of radar and raingauge samples are built up,aiming to eliminate the temporal and spatial discrepancies.A convenient and practical sampling method-the time integral vertical synchronous sampling(TIVS)is proposed and the ZOH-QG relationship is studied.It is significant that under the fixed exponent,the coefficient AB or AM varies flexibly in accordance with the temporal and spatial variability of natural precipitation,having the function of synchronously integrating the Z-R conversion and the gauge adjustment into a single equation,and thus the precipitation estimation errors caused by detecting resolution differences between radar and raingauge can be obviously mitigated.The real-time synchronous integration technique using the ZOH-QG relationship to estimate the ground hourly rainfall accumulation is called the radar-gauge synchronous integration method(RASIM).The experiments of two cases show that the accuracy of estimated surface hourly rainfall accumulation within 230 km is about 90%,and the average relative error for the point estimation over the whole process is about 20%.Through the detailed analysis of the applicability of TIVS in three environmental fields with various wind drifts,the physical essence of TIVS is explored: it is an approximate QSVS.By analyzing the data pairs of radar and raingauge,an effective quality-control procedure is established,which can greatly improve the stability and rationarity of the ZOH-QG relationship.The forecasting product of hourly rainfall accumulation derived from the RASIM has been put into operation.It is demonstrated that the RASIM plays an important role in the quantitative monitoring and forecasting of short-term torrential rainfall.  相似文献   

海道测量长期平均海面传递的异步效应计算与分析     

黄辰虎  黄谟涛  刘雁春  马福诚  侯世喜  徐广袖  孟婵媛 《海洋科学进展》2008,26(1):51-56

利用异步效应的数学表达式,分析了异步效应与长期平均海面传递误差的关系.利用中国海区典型验潮站实测数据进行了异步效应及长期平均海面传递的数值计算,证实异步效应是影响长期平均海面传递精度的主要因素.  相似文献