Additions to the Theory of the Rotation of Europa     

Jacques Henrard 《Celestial Mechanics and Dynamical Astronomy》2005,93(1-4):101-112

In a previous paper (The Rotation of Europa, Henrard, Celest. Mech. Dyn. Astr., 91, 131–149, 2005) we have developed a semi-analytical theory of Europa, one of the Galilean satellites of Jupiter. It is based on a synthetic theory of the orbit of Europa and is developed in the framework of Hamiltonian formalism. It was assumed that Europa is a rigid body and Jupiter a point mass. Several additional effects should be investigated in order to complete the theory. The present contribution considers the effect of the shape of Jupiter and of the gravitational pull of Io. The sensitivity of the main theory to a change in the values of the moments of inertia of Europa is also considered.  相似文献   

重磁剖面实时拟合系统(IGGM)的使用及效果   总被引：1，自引：1，他引：0  

刘同庆  高尔根 《安徽地质》2006,16(2):144-146

介绍了重磁剖面反演拟合系统的使用及效果情况。从软件的功能、特点及效果等方面向大家介绍了该软件的优点及独到之处,将有助于大家在资料解释和成果创新方面创造条件。  相似文献   

两种GPS测量规范在网平差检验的区别及POWERADJ转换程序的建立     

丁锐 《安徽地质》2001,11(4):250-256

论述了国家测绘局1992年6月颁发的“GPS测量规范”与中华人民共和国建设部1997年4月颁发的“GPS城市测量技术规程”在GPS观测网平差过程中的数据检验衡量标准上的区别；并在此基础上建立符合城市GPS测量规范的检验程序。  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(英文版)》2001,11(2):161-169

1 IntroductionThe geographical feature of China is quite complex with an obvious spatial heterogeneity. At the sense of spatial distribution of precipitation, under the impacts of the relative position of land to ocean and the monsoon climate, the amount of precipitation tends to decrease from south to north and from southeast to northwest. According to the hydrological regionalization, the North China Plain, one of the social and economic centers of China[1,2], is a region short of water re…  相似文献   

连续正交地面磁测用于评价含油性     

于庆洲许德树  龙大泉 《地质通报》2004,23(7):702-706

分析了石油勘探中高精度磁测未能获得高品质资料的原因，认为高精度资料与高品质资料并非等同，进而提出连续正交地面磁测观测技术。指出连续的磁力观测能够增大信息密度，避免因抽样引起品质降低；正交观测可以较好地控制垂直地质构造走向或称顺测线方向有意义的局部异常，消除由于测量原因导致的顺测线干扰，同时通过交点平差可提高观测精度。利用剖面与平面数据的抽样与统计证实了方法的有效性，并引用一个失败的例子说明所提出方法的必要性。认为现阶段开展连续正交地面磁测已具备了仪器与技术基础，具有可行性。  相似文献   

海底大地电磁数据采集器高精度应急时钟源的设计     

杜刚  魏文博  邓明  姜景捷 《物探与化探》2004,28(4):303-306

为了实现海底大地电磁探测的远参考道测量,各台仪器需同步采集数据,为此,设计了1个具有微秒级误差的高精度应急时钟源。该时钟源的设计采用单片机(MCU)为主控单元,应用了串行通讯、I²C等技术手段。文中概要介绍了其硬件组成和软件程序的设计。  相似文献   

伊犁盆地砂岩型铀矿遥感地质应用研究   总被引：1，自引：0，他引：1  

王怀武  梁放安  王学佑 《铀矿地质》2002,18(4):235-241,256

本文以遥感图像和实践资料为依据,以区域地质构造研究为中心,主攻大型可地浸砂岩型铀矿。运用板块构造理论,对伊犁盆地铀矿成矿地质背景,区域地质构造特征,控矿机理,控制因素和成矿规律等方面进行了综合分析研究。提出了在天山古岛弧系中,伊犁多相地块之上中新生代压扭性断拗盆地内稳定地伺与特定的古地理环境及其“构造阶地”,共同控制层间氧化带大型砂岩型铀矿的新观点,并将“水液型”砂岩型铀矿的成因归结为“双合”式轴成矿模式及其“八位一体”的找矿模式,为近期开发大西北,持续寻找和预测大型砂岩型铀矿提供了新的线索,明确了方向。  相似文献   

Generating basis sets of double differences     

A. Saalfeld 《Journal of Geodesy》1999,73(6):291-297

When a collection of double differences is used to compute global-positioning-system satellite orbits from a permanent network of receiving stations, linear dependence among the double-differenced observations reduces the number of double differences that contribute new information to the computations. A maximal linearly independent subset of a large collection of double differences contains all the information content of the full set. If r is the number of receivers and s is the number of satellites, the original collection of double differences may have size O(r ² s ²), whereas the linearly independent subset has size no greater than O(rs). Only such a smaller independent subset needs to participate in the more expensive double-precision matrix computations to correctly correlate all double differences, detect cycle slips, resolve ambiguities, and compute satellite orbits and station positions and relative velocities. Dependence among double differences is characterized using vector space methods together with geometric characterizations of Boolean matrices. These characterizations lend themselves to fast, robust algorithms for computing maximal linearly independent sets (bases) of double differences. An algorithm is given for constructing a generating independent set of double differences from the Boolean array of receiving-station/satellite connections. Characterizations of generator equivalence allow alternative generating sets to be identified and selected. An updating algorithm to handle local changes in the satellite–receiver connection matrix is also described. Received: 27 August 1996 / Accepted: 28 January 1999  相似文献   

跨孔同步视电阻率测量与应用     

袁家余 《物探与化探》1994,18(1):40-45

本文介绍了跨孔同步视电阻串测量工作方法。用解析法和有限元法计算了球体、二维板状体跨孔同步视电阻率测量曲线特征,并提出解释方法。该方法对解决跨孔间目标体的连通与延伸,确定目标体距测量孔的距离及解决目标体产状等方面具有较好的应用价值。在福建某铜金矿区的方法试验中与无线电波透视法比较取得了今人满意的效果。该方法对探测金属、非金属矿体、岩溶洞穴、断块油藏等方面将会显示出特殊作用。  相似文献   

虚拟地形投影与地球同步卫星定位解全集   总被引：1，自引：0，他引：1  

程芦颖 《武汉大学学报(信息科学版)》2005,30(7):629-631

基于地球同步卫星定位原理,分析了当利用数字化地形图提供测站高程时测站的多解和无解现象。利用观测方程给出了判断多解和无解的依据,提出了虚拟地形投影方法,获得了“亚稳定”收敛点的定位解子集π2。  相似文献