基于OpenGL的切片合成法及其在三维地质模型可视化中的应用   总被引：6，自引：0，他引：6  

朱小弟  曹代勇  李青元 《测绘科学》2001,26(1):30-32

介绍了基于 Open GL的剪取变换和累加缓存操作而提出的“切片合成法”,其基本原理就是对三维地质模型等间距裁剪一系列“薄片”,然后在帧缓存的累加缓存中进行迭加合成 ,最后生成地质界面的等深线图或剖面系列 ,它避免了裁剪平面与 TIN求交、等值线追踪等繁琐的操作。此方法在三维地质模型可视化、医学断层扫描三维成像等领域都有应用价值。  相似文献   

静水位-水氡单井综合观测实验研究   总被引：1，自引：0，他引：1  

蔡作馨  邓宁  杨鼎鸡  程庆斌 《福建地震》2001,(Z1)

在宁德井首例成功实现了严格意义上的地震地下水单并综合观测,水位和水化观 测同时达到满足常规要求的理想效果。本文介绍采用“循环法”实现静水位一水氡单井 综合观测的实施过程和实验观测结果,根据实验过程中的体会,对该方法的实用性和优 点作了讨论。  相似文献   

Characterization of synthetic hedenbergite (CaFeSi<Subscript>2</Subscript>O<Subscript>6</Subscript>)–petedunnite (CaZnSi<Subscript>2</Subscript>O<Subscript>6</Subscript>) solid solution series by X-ray powder diffraction and <Superscript>57</Superscript>Fe Mössbauer spectroscopy     

A. L.?Huber  M.?Heuer  K. T.?FehrEmail author  K.?Bente  E.?Schmidbauer  G. D.?Bromiley 《Physics and Chemistry of Minerals》2004,31(2):67-79

Clinopyroxenes along the solid solution series hedenbergite (CaFeSi₂O₆)–petedunnite (CaZnSi₂O₆) were synthesized under hydrothermal conditions and different oxygen fugacities at temperatures of 700 to 1200 °C and pressures of 0.2 to 2.5 GPa. Properties were determined by means of X-ray diffraction, electron microprobe analysis and ⁵⁷Fe Mössbauer spectroscopy at 298 K. Unit-cell parameters display a linear dependency with changing composition. Parameters a₀ and b₀ exhibit a linear decrease with increasing Zn content while the monoclinic angle increases linearly. Parameter c₀ is not affected by composition and remains constant at a value of 5.248 Å. The molar volume can be described according to the equation V_mol (ccm mol^–1)=33.963(16)–0.544(31)*Zn pfu. The isomer shifts of ferrous iron on the octahedral M1 site in hedenbergite are not affected by composition along the hedenbergite–petedunnite solid solution series and remain constant at an average value of 1.18 mm s^–1. Quadrupole splittings of Fe²⁺ on the M1 are, however, strongly affected by composition, and they decrease linearly with increasing petedunnite component in hedenbergite, ranging from 2.25 mm s^–1 for pure hedenbergite end member to 1.99 mm s^–1 for a solid solution containing 84 mole% petedunnite. The half-widths of intermediate solid solutions vary between 0.26 and 0.33 mm s^–1, indicating, in accordance with the microprobe analyses and X-ray diffraction, that samples are homogeneous and well-crystallized. The data from this study demonstrate that the crystallinity of hedenbergitic clinopyroxenes can be improved by using oxide mixtures as starting materials. Crystal sizes for intermediate compositions range up to 70 m, suitable for standard single-crystal X-ray analysis.This paper is dedicated to Prof. Dr. Georg Amthauer, Salzburg, on occasion of his 60th birthday  相似文献   

湖南长江洞锡矿的发现及资源前景分析     

陈荣华  龚述清  蒋仁松 《新疆地质》2005,23(3):260-263

长江洞锡多金属矿区是国土资源大调查过程中的新发现，它具有与新田岭、白腊水等特大型或超大型矿床类似的成矿特征，有寻找大型以上规模的锡铋矿床的前景．通过对该区原有资料的二次开发和地质矿产调查，对该区的成矿控矿规律有了初步的认识，对地质找矿工作亦有较为深刻的体会．认为在地质找矿工作中，应加强综合研究，注意各类找矿信息，拓宽思想，扩大找矿领域，进行综合评价．这样可避免出现反复工作，重复投入的现象，充分发挥工程的有效性，降低勘查成本和勘查周期．  相似文献   

Synthesis前兆群体异常信息提取与地震短期预测研究     

曹刻  石绍先 《地震研究》2003,26(1):20-25

建立了Synthesis法前兆群体异常信息提取的数学模型。选取滇东地区1995－2000年9月间常用的20项前兆资料，研究中强地震前后Synthesis法前兆群体异常的变化特征。研究结果表明，在研究时段内，Synthesis法前兆群体异常占时率为0.158，为小概率事件。地震对应率为5／6＝0．83，虚报率为1／6＝0．17，地震均是在异常结束后3个月之内发生，是对应概率很高的短期预报指标。成组异常出现均有成组地震对应，群体前兆“组异常”特征显著。处于计算前兆观测点中心的澄江地震前，异常幅度突出，预示了Synthesis值计算有利于提取近源短期异常。实际检验了Synthesis法在地震短期预报中的预报意义，获得了满意的效果。  相似文献   

Fabrication of dense forsterite–enstatite polycrystals for experimental studies     

R. D. McDonnell  C. J. Spiers  C. J. Peach 《Physics and Chemistry of Minerals》2002,29(1):19-31

 A practical and reliable method for the preparation of fine-grained forsterite and forsterite–enstatite polycrystals, in the system MgO–SiO₂, is described. The method employs state-of-the-art techniques from materials science, namely sol-gel synthesis, powder processing and sintering. The resulting dense polycrystalline materials are homogeneously fine-grained (1–2 μm) and uniformly foam-textured. Moreover, they are highly reproducible in composition and microstructure. The enstatite content can be controlled to within ∼1%, in the range 0–50%, and densities up to 98% of theoretical density can be achieved. The method thus yields polycrystalline forsterite–enstatite material suitable for a range of geochemical, petrological and geophysical studies. Received: 19 October 1999 / Accepted: 18 June 2001  相似文献   

A low frequency radio telescope at mauritius for a southern sky survey     

K. Golap  N. Udaya Shankar  S. Sachdev  R. Dodson  Ch. V. Sastry 《Journal of Astrophysics and Astronomy》1998,19(1-2):35-53

A new, meter-wave radio telescope has been built in the north-east of Mauritius, an island in the Indian Ocean, at a latitude of -20.14‡. The Mauritius Radio Telescope (MRT) is a Fourier Synthesis T-shaped array, consisting of a 2048 m long East-West arm and an 880 m long South arm. In the East-West arm 1024 fixed helices are arranged in 32 groups and in the South arm 16 trolleys, with four helices on each, which move on a rail are used. A 512-channel digital complex correlation receiver is used to measure the visibility function. At least 60 days of observing are required for obtaining the visibilities up to 880 m spacing. The Fourier transform of the calibrated visibilities produces a map of the area of the sky under observation with a synthesized beam width 4′ × 4.6′ sec(δ + 20.14‡) at 151.5 MHz. The primary objective of the telescope is to produce a sky survey in the declination range –70‡ to –10‡ with a point source sensitivity of about 200 mJy (3a level). This will be the southern sky equivalent of the Cambridge 6C survey. In this paper we describe the telescope, discuss the array design and the calibration techniques used, and present a map made using the telescope.  相似文献   

合成甲硫醇的一种改进方法     

钱佐国  孙明昆  周曾昊  刘升一 《中国海洋大学学报(自然科学版)》1995,(3)

提出一种以硫酸二甲酯和硫脲为基本原料的合成甲硫酸的改进方法。该方法的特点是：１．使Ｓ—甲基异硫脲硫酸盐的碱解直接在反应液中进行，而无需分离此中间体，从而使合成工艺大为简化，并能避免中间体在乙醇母液中的损失；２．甲硫酸的总产率可提高到７０％以上，且能从反应液中回收副产物双氰胺。此法不仅适用于甲硫醇的实验室制备，而且能用于工业化生产。  相似文献   

17—115℃沥青铀矿的合成及其形成速度的实验研究   总被引：1，自引：0，他引：1  

沈才卿  赵凤民 《铀矿地质》1985,(3)

本文介绍了17—115℃沥青铀矿合成的方法及对产品的鉴定结果。实验是在只有六价铀与硫代乙酰胺存在的非常简单的体系中进行的。合成的最低温度为17℃。沥青铀矿的结晶速度在不同的温度和pH条件下是不同的。温度越高,结晶速度越快。在酸性溶液中沥青铀矿结晶速度快,中性中较慢,碱性中最慢。但随着温度的提高,酸、中、碱性溶液结晶速度的差值迅速缩小。82℃时,无论酸、中、碱性溶液中的沥青铀矿均能在半小时内结晶出来。  相似文献   

Natural iron oxalates and their analogous synthetic counterparts: A review     

《Chemie der Erde / Geochemistry》2016,76(3):449-460

Four iron-containing natural oxalates, usually classified as organic minerals, are known (humboldtine, minguzzite, stepanovite and zhemchuzhnikovite). Their occurrences and general properties are presented and briefly discussed. The subsequent part of the review is devoted to the discussion of synthetic oxalato-complexes, analogous to these natural species, including usual synthetic procedures and a thorough analysis of their crystallographic and structural peculiarities. The thermal, spectroscopic and magnetic properties of these complexes are also analyzed in detail and comparisons with other closely related complexes are also included in the discussions.  相似文献