关于水中氡气测量的几个问题     

郝土胤 《华东地质学院学报》1989,12(4):42-47

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矿物热敏参数测试仪及其在地质找矿中的应用     

赵亨达  王忠荣 《岩石矿物学杂志》1994,13(2):175-186

介绍了国内外第一台矿物热敏参数测试仪研制的原理、应用范围和对一些金属矿物、半导体矿物的测试情况以及仪器在浙江、赣南等地区金矿找矿中的初步应用。  相似文献   

Descriptive statistics for N -dimensional closed arrays: A spherical coordinate approach     

Clifford R. Stanley 《Mathematical Geology》1990,22(8):933-956

Recent publications have demonstrated that the composition of a system can be described by the angles which define the vector resulting from the projection of the composition onto the unit hypersphere. Although published trigonometric relationships allow determination of the angles in any number of dimensions, no general hyperdimensional recursive formulae exist for the calculation of these quantities and their variances and covariances. A general methodology for calculating the angles which describe the compositions of systems in any number of dimensions is presented. These angles can be used to calculate statistics (central moments and resultant vectors) describing the central tendency and dispersion among rock compositions, as well as to quantify the angular differences between compositions. Equations that relate the variances and covariances of these angular variables to the variances and covariances of the actual component proportion variables are presented, allowing projection of these measurements from one reference frame to another (cartesian to spherical and vice versa).  相似文献   

标准化测量方法在XRF分析中的作用和意义：Ⅱ.在不同制样条件中的应用     

陈永君 《岩矿测试》1991,10(3):232-235

本文利用标准化测量方法的校准作用,可将一种制样条件下形成的校正曲线在不同种制样条件的样品测定中使用,其结果进一步补充证明了标准化测量方法在XRF分析中的作用。  相似文献   

扫描电镜的定量体视测量法     

冯有纲  汪大成 《矿物学报》1985,(3)

本文提出了一种新的体视学原理及其在扫描电子显微镜中的应用。借助于它的实验技术,可从图象中获得大量信息,而且能测定图片上任何物体的真实尺寸与几何图形,这种方法具有如下的新功能:1.可测定小晶面夹角;2.可测定图片上任意两点之间的真实距离;3.可测定曲线的长度和曲面的面积。文中例举了该法应用于地学的三例.  相似文献   

夜间气象能见度的测量研究   总被引：3，自引：0，他引：3  

胡江华  周建勋 《南京气象学院学报》1995,18(4):584-587

运用能见度理论和双止偏光能见度测定仪原理，讨论了夜间气象能见度的测量原理和一种新的测量方法，并完成了初步的野外对比试验，得出了比较结论。  相似文献   

地图数字化数据坐标变换的相关性分析   总被引：4，自引：0，他引：4  

余晓红  刘大杰 《武汉大学学报(信息科学版)》2002,27(5):456-461

将用于求定地图数字化坐标转换参数的已知点的地面坐标和数字化坐标都当作观测值，用随有参数的条件平差求定转换参数，对采用4个已知点、9个已知点分别进行相似与仿射变换进行了分析，计算了格网点之间的相关系数，进一步分析了格网点间相关系数的分布规律，对转换后的坐标相关性进行了讨论。  相似文献   

EDMI最高可能达到的精度 (测距精度)的检测     

罗诚 《测绘与空间地理信息》2001,24(3):40-41,46

规范明确规定对投入使用的光电测距仪必须对其进行检测,只有这样才能保证测距成果的可靠性.本文主要通过检测测距仪各项误差,得出测距仪最高可能达到的测距精度,使操作者在使用此测距仪的过程中明白对各项误差应采取怎样的措施,充分发挥测距仪的精度潜力.  相似文献   

带缓和曲线的特大桥坐标计算及放样方法     

夏冬君  王鑫  杨继禹 《测绘与空间地理信息》2001,24(4):44-46

介绍一种带缓和曲线的特大桥桥墩在测量坐标系下的坐标计算及桥墩放样方法 ,以及Leica全站仪在桥梁施工放样中的应用  相似文献   

一个压力坐标下的海洋环流模式   总被引：5，自引：0，他引：5  

Huang Ruixin  Jin Xiangze  Zhang Xuehong 《大气科学进展》2001,18(1):1-22

A new oceanic general circulation model in pressure coordinates is formulated. Since the bottom pressure changes with time, the vertical coordinate is actually a pressure-σ coordinate. The numerical solution of the model is based on an energy-conservation scheme of finite difference. The most important new feature of the model is that it is a truly compressible ocean model and it is free of the Boussinesq approxima tions. Thus, the new model is quite different from many existing models in the following ways: 1) the exact form of mass conservation, 2) the in-situ instantaneous pressure and the UNESCO equation of state to calculate density, 3) the in-situ density in the momentum equations, 4) finite difference schemes that conserve the total energy. Initial tests showed that the model code runs smoothly, and it is quite stable. The quasi-steady circulation patterns generated by the new model compare well with existing models, but the time evolution of the new model seems different from some existing models. Thus, the non-Boussinesq models may provide more accurate information for climate study and satellite observations.  相似文献