Development and future prospects of quantitative mineral assessment in China     

《China Geology》2019,2(2):198-210

Mineral potential assessment at the Earth’s surface has been an important research for geoscientists around the world in the past five decades. The fundamental aspects of mineral assessment at different scales can be associated with the following tasks, e.g., mineral potential mapping and estimation of mineral resources. This paper summarized the history and development in terms of theories, methods technologies and software platforms for quantitative assessment of mineral resources in China, e.g. comprehensive information methodology, geological anomaly, three-component quantitative prediction method, 5P ore-finding area, integrated information assessment method, nonlinear process modeling and fractals, three dimensional mineral potential mapping, etc. At last, to discuss the future of quantitative mineral assessment in an era of big data including platform for 3D visualization, analysis and sharing, new methods and protocols for data cleaning, information enhancement, information integration, and uncertainties and multiple explanations of multi-information.© 2019 China Geology Editorial Office.  相似文献   

基于改进InceptionV3模型的常见矿物智能识别     

彭伟航  白林  商世为  唐小洁  张哲远 《地质通报》2019,38(12):2059-2066

以常见的16类矿物作为研究对象,收集每一类矿物约1000张图像,按比例划分为训练集、验证集和测试集,通过图像随机选取增加数据的多样性,建立矿物识别InceptionV3模型,训练7万次在测试集上获得81%的识别正确率。通过对损失函数的改进,引入Center Loss损失函数,训练40万次识别准确率提高到86%。对分类的混淆矩阵分析发现,孔雀石等外观特征明显的矿物识别正确率很高,而闪锌矿等与其他矿物容易混淆导致正确率较低。从特征图分析看出,模型很好地提取了孔雀石的放射状特征,矿物图像特征向量聚集程度很高,也说明了模型的可靠性。  相似文献   

基于非监督学习的水力压裂裂缝平面识别     

马孜卓  郑忆康  薛清峰  翟鸿宇  雷兴林 《中国地震》2021,37(2):322-331

在水力压裂施工中,如何有效获取压裂过程中产生的裂缝形态以及裂缝的动态扩展过程一直是困扰学术界和工业界的问题。目前,常规利用微地震事件定位结果进行分析的方法存在需要人工干预、散点信息表示能力不足等问题;采用数值模拟分析的方法往往因复杂的地下介质情况而引入计算偏差。本文基于非监督学习算法,通过提取微地震事件的空间和时间信息,实现对裂缝平面的识别以及裂缝网络拓展路径的分析;并通过引入水力压裂岩石物理实验,利用实际监测获得的声发射数据以及对应的真实破裂情况的CT扫描数据,检验方法的可行性。最终结果表明,本文所提方法对主断裂有较好的识别效果,识别结果与CT扫描的真实结果吻合性较好。  相似文献   

Recent advances in earthquake monitoring II: Emergence of next-generation intelligent systems          下载免费PDF全文

Zefeng Li 《地震科学（英文版）》2021,34(6):531-540

Seismic data processing techniques, together with seismic instrumentation, determine our earthquake monitoring capability and the quality of resulting earthquake catalogs. This paper is intended to review the improvement of earthquake monitoring capability from the perspective of data processing. Over the past two decades, seismologists have made considerable advancements in seismic data processing, partly thanks to the significant development of computational power, signal processing, and machine learning techniques. In particular, wide application of template matching and increasing use of deep learning significantly enhance our capability to extract signals of small earthquakes from noisy data. Relative location techniques provide a critical tool to elucidate fault geometries and seismicity migration patterns at unprecedented resolution. These techniques are becoming standard, leading to emerging intelligent software systems for next-generation earthquake monitoring. Prospective improvements in future research must consider the urgent needs in highly generalizable detection algorithms (for both permanent and temporary deployments) and in emergency real-time monitoring of ongoing sequences (e.g., aftershock and induced seismicity sequences). We believe that the maturing of intelligent and high-resolution processing systems could transform traditional earthquake monitoring workflows and eventually liberate seismologists from laborious catalog construction tasks.  相似文献   

Ensemble prediction model of solar proton events associated with solar flares and coronal mass ejections     

Xin Huang  Hua-Ning Wang  Le-Ping Li 《天体物理学报》2012,(3):313-321

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一种利用流形学习进行多影像匹配的方法     

李爱霞  关泽群  冯甜甜 《武汉大学学报(信息科学版)》2012,37(11)

提出了一种利用流形学习方法进行多影像匹配的算法。通过两组宽基线序列影像的匹配实验,并与LE-SIFT方法、SVD-SIFT方法和基于局部线性映射的LLE-SVD方法进行了对比分析。结果表明,本文方法在获得多幅影像的共同匹配结果和利用多幅影像之间的约束实现两幅影像匹配的结果上都优于现有方法。  相似文献   

Geographical Notes     

《The Journal of geography》2012,111(3):131-136

Abstract

This article describes the benefits of combining field-based learning within the context of a competitive setting in the geography curriculum. Findings and data are presented based on experiences gathered from teaching an upper-level university geography course that combined geographic techniques and theory into a game of capture-the-flag. Students analyzed a variety of geospatial data sources, using ArcMap Geographic Information System software, to prepare a series of maps for the game. Students reported a first-time understanding of many geographic skills that were previously ambiguous to them when the material was presented in a different format, such as lectures and labs.  相似文献   

Learning by Doing: Implementing Community Service-based Learning   总被引：1，自引：1，他引：0  

《The Journal of geography》2012,111(4):144-152

Abstract

Community-based Learning (CSBL) is based on the idea that learning is facilitated when the classroom is linked with real-world experience. This paper presents an overview of the pedagogical basis of community service-based learning (CSBL) and compares CSBL projects carried out in two very different settings. The findings indicate that in order to implement CSBL successfully, instructors need to plan ahead, develop partnerships with community organizations, and allow community groups to guide student projects. It is also important to recognize that the full benefits of CSBL are only gained when students, community members, and instructors spend time reflecting on the CSBL experience.  相似文献   

Editorial     

《The Journal of geography》2012,111(5):217-218

Abstract

Project GeoSim is a multidisciplinary effort by members of Virginia Tech's Departments of Geography and Computer Science, College of Education, and Learning Resources Center to develop computer-aided education (CAE) software for introductory geography and related classes. GeoSim laboratory exercises draw on the five fundamental themes of geography for their subject matter. The programs emphasize interactive learning combining the information capabilities of Geographic Information Systems (GIS) with the techniques of computer simulation. The result is a series of geographic explorations that will make available some of the most exciting aspects of geography to a potential audience of 425,000 introductory geography students per year.  相似文献   

Internet-Based GIS in an Inductive Learning Environment: A Case Study of Ninth-Grade Geography Students   总被引：2，自引：2，他引：0  

《The Journal of geography》2012,111(6):227-237

Abstract

This article reports the results of a qualitative case study that explored the use of Internet-based geographic information systems (IGIS) with ninth-grade geography students. The students worked in teams to examine the geography of Africa using IGIS resources with the instructional goal of developing a presentation on a significant issue facing one region or country. The purpose of this study was to explore the use of IGIS as a tool for integrating geospatial technologies into ninth-grade geography curriculum and instruction within an inductive learning environment. The findings for this study indicate that IGIS can be a successful tool for geography education in an inductive learning environment. Based on qualitative data collected through classroom observations, focus group interviews with students, student work samples, and a teacher journal, two assertions are offered: students perceived expanded freedom as a positive aspect of this IGIS project and IGIS projects such as this can lead to gains in students' cultural awareness and empathy for distant others.  相似文献