Quantitative Analysis of Scale of Aeromagnetic Data Raises Questions About Geologic-Map Scale

A recently published study has shown that small-scale geologic map data can reproduce mineral assessments made with considerably larger scale data. This result contradicts conventional wisdom about the importance of scale in mineral exploration, at least for regional studies. In order to formally investigate aspects of scale, a weights-of-evidence analysis using known gold occurrences and deposits in the Central Lapland Greenstone Belt of Finland as training sites provided a test of the predictive power of the aeromagnetic data. These orogenic-mesothermal-type gold occurrences and deposits have strong lithologic and structural controls associated with long (up to several kilometers), narrow (up to hundreds of meters) hydrothermal alteration zones with associated magnetic lows. The aeromagnetic data were processed using conventional geophysical methods of successive upward continuation simulating terrane clearance or ‘flight height’ from the original 30 m to an artificial 2000 m. The analyses show, as expected, that the predictive power of aeromagnetic data, as measured by the weights-of-evidence contrast, decreases with increasing flight height. Interestingly, the Moran autocorrelation of aeromagnetic data representing differing flight height, that is spatial scales, decreases with decreasing resolution of source data. The Moran autocorrelation coefficient scems to be another measure of the quality of the aeromagnetic data for predicting exploration targets.     

基于栅格图片的建设用地图形辅助审查系统

本文介绍了在土地利用现状等基础数据库未建成的情况下,如何利用GIS技术实现栅格图件配准、拼接,界址点坐标无缝展示以及栅格图片的局部矢量化和面积量算等,为建设用地审查提供辅助依据,以提高用地审批的科学性和工作效率。     

Coupled hydro-mechanical fault reactivation analysis incorporating evidence theory for uncertainty quantification

The injection of water (or CO₂) at high pressure is a common practice to enhance oil production. A crucial component of this activity is the estimation of the maximum pressure at which the fluids can be injected without inducing the reactivation of pre-existing faults that may exist in the formation. The damage zones typically formed around the geological faults are highly heterogeneous. The materials involved in the damage zones are characterized by the huge variation of their properties and high uncertainties associated with them. To estimate the maximum allowable injection pressure this paper presents a novel approach based on: a coupled hydro-mechanical formulation (for the numerical analyses); a criterion based on the total plastic work (for the fault reactivation); and the evidence theory (for uncertainty quantification). A case study based on information gathered from an actual field is presented to illustrate the capabilities of the proposed framework.     

地震预报的证据理论方法

概率论和数理统计方法一直是地震预报中处理不确定性的主要方法，但在很多情况下并不是特别有效。本引进了一种新的不确定性处理方法一证据理论方法，介绍了如何用该理论表达地震预报问题。讨论了应用其D-S合成规则进行预报的一般过程，并根据地震综合预报的特点，提出了加权的D-S规则。研究结果表明，证据理论应用于地震预报有其独特的优点。     

参数线性规划及应用讨论

本文介绍了测绘运筹学参数线性规划的实用意义,并就如何应用参数线性规划为测绘生产管理提供量化决策依据进行了讨论。     

CHARACTERIZATION OF FOODS BY INEXACT RULES:THE SEXIA EXPERT SYSTEM

SEXIA is an expert system that uses a new methodological approach to identify foods,particularly oliveoils according to varieties,olive zones and denominations of origin.The methodological approachprovides identification tools,associating a confidence degree or a belief interval to the final hypotheses.The certainty factor and the Dempster-Shaffer theory,with some modifications,have been implementedin SEXIA.The computer can work with 50 chemical parameters whose data have previously beenacquired by the food analyst via a dialogue in the Spanish language.The system has been verified with144 olive oil samples.In this paper some results obtained for distinguishing the Arbequina variety fromother varieties using SEXIA and the BMDP stepwise discriminant analysis program are presented.Finally,promising directions for future research are suggested.     

福建第四纪不可能有冰川活动

根据已有研究的文献资料,对福建第四纪冰期时没有冰川活动进行论证．首先从早、中、晚更新世的化石研究资料,阐明福建地层古生物资料不支持“冰川说”;然后根据福建从北到南各地大量现存的第三纪以至古生代的喜暖孑遗植物,说明第四纪福建南北都没有冰川活动;再从福建的纬度和海拔2方面,证明福建第四纪不具备形成冰川的温度条件;最后指出所谓的冰臼,实为河水冲刷侵蚀而成的壶穴．     

关于广东有无冰川发育条件的讨论

因为“冰臼”一词尚未得到地学界认可，建议继续用“冰川壶穴”来替代“冰臼”。由于生成冰臼（冰川壶穴）与壶穴的水动力条件和地貌形态相似，所以单从形态难以区分广东河床上的壶穴或冰臼，只有确定广东是否发育过第四纪冰川之后，才可能确定广东是否有冰臼。本文从气候、地貌和生物角度证实广东未出现过第四纪冰川环境，并认为所谓：①水应力集中一点生成冰臼；②花岗岩坚硬不能生成壶穴；③二、三百万年前生成冰臼等冰臼论观点是     

气候模式与古气候研究

简要叙述了气候模式的定义及发展情况,介绍了几种常用于古气候模拟的气候模式类型,说明了气候模式在古气候研究中的应用和取得的主要成果,揭示出气候模式在古气候研究领域里的广阔前景。