低压易漏裸眼井段技术套管固井技术

龙岗构造是四川盆地北部深层天然气勘探开发的重要区域,针对该区域Φ244.5 mm技术套管固井井段长裸眼、含油气层多套、油气显示频繁强烈、钻井过程中涌漏同存问题,将井眼准备、套管选择、优选水泥浆体系与配方、地面施工工艺等提高固井质量的主要技术措施集成优化,并采用空井固井、预应力固井等特色技术,保证了龙岗构造技术套管的固井质量,应用效果良好。     

灌注桩钢筋笼磁异常定量计算

灌注桩中的钢筋笼在地磁场中受磁化作用而产生磁感应强度,使灌注桩附近的磁场强度发生变化.通过对钢筋笼主筋进行剖分,得到钢筋笼的仿真模型,而后根据磁性体磁场公式,利用MATLAB平台开发的计算机程序定量计算出模型桩钢筋笼磁异常.经分析表明钢筋笼仿真模型的计算能够较准确的反映出灌注桩钢筋笼磁异常特征.本研究对钢筋笼长度检测及主筋数量的估计具有较好的指导意义.     

AN ANALYSIS OF THE ASYMMETRICAL STRUCTURE OF TYPHOON AERE'S PRECIPITATION

The structural characteristics of 2004 typhoon Aere's precipitation are analyzed using the high-resolution data from the Tropical Rainfall Measuring Mission(TRMM) of the National Aeronautics Space Administration(NASA).It is found that the typhoon's characteristics vary at different stages of its development.To analyze the asymmetric causation of precipitation distribution,data from the National Center for Environmental Prediction(NCEP) reanalysis are used to calculate the vertical integral of the water vapo...     

基于模块化设计的数字雷达人工增雨作业指挥系统

以计算机模块化设计为基础,将火箭人工增雨流动作业决策指挥系统分为6个模块：（1）雷达产品的自动生成,（2）增雨潜力分析和车辆调度,（3）云状自动识别,（4）作业条件判断与参数输出,（5）再作业自动判别,（6）作业结束判断。最后以这些模块作为系统的框架,利用概率分布函数自动判别回波的移向移速;采用SHY95算法和BL算法,基于神经网络的模式识别方法自动识别云状。通过人工影响天气最新研究成果、雷达图像和地理信息图像叠加、雷达产品二次开发等综合技术集成,实现了自动化程度较高的,火箭增雨流动作业的科学决策指挥系统。     

地球系统动力学模式及模拟研究

将地球上大气、海洋、地理环境和生态各圈看成一个有机的整体进行研究,并统一协调全球气候、生态与环境变化的有关研究（如WCRP、IGBP、IHDP、DIVERSITAS及IPCC、Global Change等),现称为地球系统动力学。它是新兴的学科,其核心之一就是要建立地球系统动力学理论模式并作模拟研究。本文主要概述了我国地球系统动力学模式研制和发展的有关现状及近年来特别是中国科学院“三期创新”资源和海洋科技创新基地重要方向项目群“地球系统动力学模式研究”启动前后所取得的阶段性成果及主要进展,指出了我国地球系统动力学模式发展应重点研究和解决的科学问题及其主要特色,其中有不少结果是新颖的和具有我国特点的。     

祁连山东段半干旱区黄土磁组构及其环境意义

1 IntroductionM agnetic fabric is the basic character and the im portant trait for m agnetic m inerals insedim entary rocks.Ithas been w idely used in geologicaland environm entalinvestigations in thepastdecades (Ress,1965;Rolph,1989;Sagnotti,1998;Raposo,…     

GPS/BDS-2/Galileo混合双差相对定位模型应用于短基线精密定位研究

对单/双频GPS/BDS/Galileo混合双差相对定位模型算法进行研究,推导了GPS/BDS/Galileo混合双差相对定位模型。选择短基线数据进行实验,对GPS、GPS/BDS标准双差、GPS/BDS混合双差、GPS/Galileo混合双差以及GPS/BDS/Galileo混合双差解算模式在定位精度、模糊度固定速度方面进行对比分析。结果表明,相对于GPS单系统或GPS/BDS双系统标准双差解算模式,双系统或三系统混合双差解算模式能有效提高模糊度首次固定时间,定位精度也有一定程度的提升。     

The relationship between modern meteorological elements and the southern border of the Tengger Desert

The modern southern border of the Tengger Desert protrudes southward at the east and west ends and recedes northward in the central part. However, no satisfactory explanation can be given for the shape of this border according to geomorphological elements. From the west to the east of the south of the Tengger Desert, there is a gradual change in precipitation, humidity, temperature, and mean wind speed, which differs from the abrupt modeled change in the desert’s southern border distribution. The indication is that these meteorological elements are not the main factors controlling the migration of the southern border of the Tengger Desert. The extreme and maximum wind speeds at the east and west ends of the Tengger Desert are stronger than those of the central part. Consequently, the sand dunes at both ends move faster than those of the central part, causing the southern border of the Tengger Desert to protrude southward at both ends and recede northward in the central part. As a result, winds occurring in winter and spring, especially the strong northwest winds in spring, are the main controlling factor for the migration of the southern border of the Tengger Desert.     

Research on water resources conservation of mountain river based on the concept of region partition

Presently concepts and methods related to water resources conservation of mountain rivers are seriously insufficient,and its level is far from being adaptable to the development of a harmonious society.As mountain ecosystems play a key role in water resources conservation of mountain rivers,and the characteristics of mountain ecosystems and hydrologic features of mountain river follow strong temporal and spatial distribution,partition theory can be applied to the water resources conservation of mountain river.This theory observes the following partition principles:regional relativity,spatial continuity,integralcounty,meeting management needs,hierarchical principle,and comparability principle.And it lays equal emphasis on both water resources conservation and environmental protection,on both water quality conservation and water quantity protection,on the combination of water features,water cycle and water pollution.In the partition methods,index method and map superposition method will be applied in region partition.The example of region partition of water resources conservation in the upper reaches of the Yangtze River shows that the partition theory is practicable in water resources conservation of mountain rivers,and it provides a platform for future study in water resources conservation.     

夏季玉龙雪山及丽江盆地水体主要无机离子特征

为探究玉龙雪山地区地-气-水-人之间的相互作用机理,于2005年7月22-28日在云南省丽江市玉龙雪山地区采集不同水体样品,在探讨不同水体水文联系的基础上,对该区域不同水体的无机离子浓度和特征进行了分析。结果表明玉龙雪山地区不同水体无机离子浓度存在较为明显的差距,无机离子浓度较大的是低海拔地区的湖水和地下水,浓度较小的是冰舌融水和融水径流;水体主要无机离子是HCO3-,Ca2＋,Mg2＋,SO42-,Na＋,K＋,Cl-,其中Ca2＋占整个阳离子的53.27%,是最大优势阳离子,阴离子中HCO3-是优势阴离子,占阴离子总量的70.35%左右,优势离子与非优势离子之间浓度差距较大。海拔4270 m以上,受局地岩石岩性的影响无机离子浓度较高;海拔42703180 m,由于新鲜融水未充分溶解基岩的离子和水体本身的沉积作用,离子浓度较低;海拔30462400 m,水岩作用导致水体HCO3-,Mg2＋,Ca2＋,K＋,Na＋浓度较高,季风输送和近源人类活动导致NO3-、SO42-,K＋浓度也较高;相关性分析表明阳离子的来源、存在方式和反应机理的相似性比阴离子强;SO42-对区域水岩反应有较强的加速作用;Mg2＋和Ca2＋同源。