Mapgis在地质学中的应用   总被引：7，自引：0，他引：7  

黎华  崔振昂  李方林 《物探化探计算技术》2003,25(1):50-53

简要讨论了Mapgis的主要功能，重点阐述了Mapgis的地质制图技术、空间分析技术以及二次开发能力在地质学领域中的应用，并举例论述之。Mapgis的地质制图技术将纷繁复杂的传统地质制图过程简化，而且美观精确；空间分析技术可以将矢量数据和栅格数据综合制作出各种图形和图象文件，方便分析；地质工作者也可以运用Mapgis的二次开发能力来开发面向特定领域的系统。  相似文献   

由电法勘探资料计算地下水矿化度的软件系统     

强建科  郭建强  朱庆俊  罗延钟 《物探化探计算技术》2003,25(3):226-231

地下水矿化度是划分地下咸淡水的重要参数，过去人们常用手工计算。但由于涉及的参数众多，计算过程烦琐，人工计算不仅速度慢，而且容易出错。一种利用Visual Fortrain和C^ 编制的批量计算地下水矿化度的软件系统，可有效地解决这类烦恼。该系统根据事先由电(磁)测深资料反演出的真电阻率数据，借助水文地质资料划分出不同区块的孔隙度、水质类型及温度等参数，自行判别计算公式，在数秒内可算完一条电(磁)测深剖面下的地下水矿化度。经实际试算，效果令人满意。  相似文献   

首都圈地区中等地震前小震活动异常特征分析   总被引：1，自引：0，他引：1  

兰从欣  朱红彬  郭心 《华北地震科学》2003,21(1):11-14

近年来首都圈地区以中等地震活动为主，本文用反映地震频率、能量、平均震级的基本参量如频率、缺震、断层总面积、地震活动度等研究该区中等地震前的活动性异常特征，发现这些异常对1999－2001年首都圈地区的中等地震有较好的对应关系，当同时出现三项低值异常后，有震预后准确率较高。这些方法对首都圈地区中等地震的短期预报有重要作用，2001年12月28日滦县M14．2级地震就是用该方法在震前做了较成功的预测。由于参量指标与地震间的映震效果具有一定的阶段性和区域性，需要用发展变化的眼光，时刻跟踪并不断调整改进所使用的参量指标，才能更好地捕获地震信息。  相似文献   

Focused ion beam technique and transmission electron microscope studies of microdiamonds from the Saxonian Erzgebirge, Germany     

Larissa F. Dobrzhinetskaya  Harry W. Green  Matthew Weschler  Mark Darus  Young-Chung Wang  Hans-Joachim Massonne  Bernhard St  ckhert 《Earth and Planetary Science Letters》2003,210(3-4):399-410

A focused ion beam of Ga ions is a relatively new technique that has been developed for microelectronic industries. Now researchers of the Earth sciences find it to be a promising tool for studying various geological materials. Using the FIB technique and an FEI Strata DB 235 dual beam system, we have successfully prepared several electron-transparent foils, which crossed μm-sized diamonds included in host minerals such as zircon and garnet from quartzofeldspathic rocks of the Saxonian Erzgebirge, Germany. Scanning and transmission electron microscopy applied to these foils revealed that the diamonds contain crystalline nanometric inclusions. These inclusions consist of minerals of known stoichiometries such as SiO₂ and Al₂SiO₅, whereas others are characterized by different combinations of Si, K, P, Ti, and Fe in the presence of oxygen (stoichiometries are not clear at this stage of research). One suite of inclusions is assumed to be represented by archerite, KH₂PO₄, which is known to be stable at pressures of 4–22 GPa, and one nanocrystal containing Pb, oxygen and carbon is interpreted to be Pb_xO_y or PbCO₃. Along with solid crystalline inclusions, the diamonds contain cavities filled by liquid/gas that escaped during sample preparation. These are associated with dislocations of diamond growth. Our data are consistent with the concept of diamond crystallization from a COH-rich multicomponent supercritical fluid and suggest that the composition of such a fluid is more consistent with a local crustal source rather than that of a mantle origin.  相似文献   

全站仪轴系补偿原理及检验方法探讨   总被引：1，自引：0，他引：1  

叶晓明  凌模  谢方 《测绘信息与工程》2003,28(3):40-43

全面阐述了全站仪的轴系补偿相关理论和实践，指出了我国检验规程的不足之处，提出了改进方法。  相似文献   

现代城市数字测图方法浅析     

张文胜 《四川测绘》2003,26(4):155-157

本文分析比较了目前城市大比例尺数字化测图中主要方法的优缺点，并为实现数字化地形图中不连续线、面状符号及复杂线状符号向GIS的自动化导入，针对电子平板法提出了基础线的概念。对全站仪草图法，提出在全站仪上加挂微型计算机，并用常规摄像方法代替草图。  相似文献   

Determination of Halogens (F, Cl, Br, I), Sulfur and Water in Seventeen Geological Reference Materials   总被引：5，自引：0，他引：5  

Agnès Michel  Benoît Villemant 《Geostandards and Geoanalytical Research》2003,27(2):163-171

Fluorine, chlorine, bromine, iodine and sulfur were determined in seventeen geological reference materials after extraction by pyrohydrolysis. Fluorine, Cl and S (as sulfate ions) were determined in the extraction solution by ion chromatography with detection limits of around 0.2 mg l⁻¹. Bromine and I were measured by ICP-MS with detection limits of 1 μg l⁻¹ for Br and 0.1 μg l⁻¹ for I. For rock samples, using normal extraction conditions (500 mg of sample and 100 ml of final solution) detection limits were 40 mg kg⁻¹ for F and Cl, 15 mg kg⁻¹ for S, 0.2 mg kg⁻¹ for Br and 0.02 mg kg⁻¹ for I. These detection limits may be improved by increasing the amount of sample and hence the concentration of the final solution. Water was also determined using an extraction technique based on H₂O degassing, reduction on zinc at 1000 °C and H₂ manometry. Our results for fluorine, chlorine, sulfur and water are in good agreement with literature data. Very few reference materials have recommended values for bromine and especially for iodine. Among the analysed samples, three are new reference materials: BHVO-2, BCR-2 and AGV-2.  相似文献   

新疆盐渍土分散性研究     

杨昭  席福来  缪元勋  陈华  申联奇 《岩土力学》2003,(Z1)

通过研究分析盐渍土及改变盐渍含量对分散性试验的影响,认为土块试验、针孔试验对受高钠离子影响的盐渍土分散性评价是较为有效的方法。新疆土料石膏发育,环境水中Ca2+离子丰富,分散性评价最好在工程实际情况下进行。  相似文献   

硫同位素混合总体筛分   总被引：4，自引：1，他引：4       下载免费PDF全文

崔彬  赵磊  詹朝阳  和志军 《地球学报》2003,24(6):494-496

现代矿床学研究表明，绝大多数矿床的形成具有多来源、多阶段、多成因的特点。定量研究S同位素来源可将形成一个矿床的过程看作是多个总体的混合或叠加，在数学上这种混合或叠加可以用混合总体筛分的数学模型来描述。笔者在长江中下游地区和湖南东坡矿田中成功地应用混合总体筛分的数学模型，定量研究了S同位素来源的问题，这一问题的解决对于研究成矿物质来源和成矿机理具有重要的意义。  相似文献   

气象卫星低分辨率资料传输的数字化          下载免费PDF全文

徐建平  施进明 《气象科技》2003,31(5):289-292

气象卫星低分辨率模拟资料传输WEFAX即将数字化为LRIT，阐述了LRIT(低分辨率信息传输)内容、LRIT数据传输模式和系统结构以及各卫星运行国LRIT传输比较。  相似文献