层次分析与模糊数学综合评价法在矿山环境评价中的应用   总被引：2，自引：1，他引：1  

陈哲锋  吴静  郭玉斌  林腾 《华东地质》2018,(4):305-310

采用遥感技术提取矿山环境评价因子,运用层次分析法与模糊数学法对三江成矿带南段矿山环境进行综合评价。层次分析法确定的矿山环境评价因子按权重排序,依次为植被覆盖率、土地利用、地形地貌、矿山地质灾害、水土流失和矿山开发占地;模糊数学法评价的区域矿山环境隶属第一等级"好"。通过GIS平台,按权重值对评价因子进行叠加、成图,实现了三江成矿带南段的矿山环境评价。层次分析与模糊数学综合评价法,不仅综合考虑矿山环境影响因子,且充分发挥了2种数学方法的优点,将动态与静态、定量与非定量等指标有机结合,发挥其因素和过程的模糊性,减少了专家人为评分的主观性,使评价结果更符合实际。  相似文献   

A modified mix-differenced approach for estimating multi-GNSS real-time satellite clock offsets     

Yongchang Chen  Yunbin Yuan  Baocheng Zhang  Teng Liu  Wenwu Ding  Qingsong Ai 《GPS Solutions》2018,22(3):72

A modified mixed-differenced approach for estimating multi-GNSS real-time clock offsets is presented. This approach, as compared to the earlier presented mixed-differenced approach which uses epoch-differenced and undifferenced observations, further adds a satellite-differenced process. The proposed approach, based on real-time orbit products and a mix of epoch-differenced and satellite-differenced observations to estimate only satellite clock offsets and tropospheric zenith wet delays, has fewer estimated parameters than other approaches, and thus its implementing procedure is efficient and can be performed and extended easily. To obtain high accuracy, the approach involves three steps. First, the high-accuracy tropospheric zenith wet delay of each station is estimated using mixed-differenced carrier phase observations. Second, satellite clock offset changes between adjacent epochs are estimated using also mixed-differenced carrier phase observations. Third, the satellite clock offsets at the initial epoch are estimated using satellite-differenced pseudorange observations. Finally, the initial epoch clock results and clock offset changes are concatenated to obtain the clock results of the current epoch. To validate the real-time satellite clock results, multi-GNSS post-processing clock products from IGS ACs were selected for comparison. From the comparison, the standard deviations of the GPS, GLONASS, BeiDou and Galileo systems clock results are approximately 0.1–0.4 ns, except for the BeiDou GEO satellites. The root mean squares are about 0.4–2.3 ns, which are similar to those of other international real-time products. When the clock estimates were assessed based on a pseudo-kinematic PPP procedure, the positioning accuracies in the East, North and Up components reach 5.6, 5.5 and 7.6 cm, respectively, which meet the centimeter level and are comparable to the application of other products.  相似文献   

A three-dimensional large-deformation random finite-element study of landslide runout considering spatially varying soil     

Chen  Xuejian  Li  Dianqing  Tang  Xiaosong  Liu  Yong 《Landslides》2021,18(9):3149-3162

Landslides - Landslide is a uniquely dynamic large-deformation process that can present serious threat to human lives and infrastructures. The natural soil properties often exhibit inherent spatial...  相似文献   

浅论造山型金矿中碳质黑色页岩的来源及其在金成矿过程中的作用     

邓腾  丁正鹏  许德如 《地球科学进展》2021,36(10):1077-1091

碳质黑色页岩形成于各个不同地质历史时期的海洋缺氧水体中,通常可视作潜在的成矿物质来源,目前对于碳质黑色页岩的研究主要集中在传统能源矿产领域,其与金矿床相关成矿机制的关联尚缺乏系统性的深入研究.在总结近10年造山型金矿中碳质黑色页岩研究成果的基础上,归纳前人对碳质黑色页岩的来源、形成环境和过程、地球化学特征以及其与造山型金矿化的成矿物质来源、元素迁移—活化—沉淀机制关系的认识:①碳质黑色页岩主要形成于海洋静闭极度缺氧环境;②碳质黑色页岩比普通黑色页岩更富集金、银、钼、钒、镍和铬等稀有金属;③碳质黑色页岩能够通过地层的区域变质运动释放金元素进入深部变质成矿流体;④碳质黑色页岩通常相对其他岩层在构造活动中更易形成容矿构造并作为强力还原剂导致金的沉淀;⑤碳质黑色页岩能够作为显著的找矿标志指导找矿.然而,这些认识不仅与造山型金矿床的传统成因模式存在一定的差异,而且也将引起传统找矿勘查评价准则的改变.目前,我国对于造山型金矿床中碳质物的研究仍较为薄弱,亟待开展该领域的研究,为找矿勘察工作提供科学依据.  相似文献   

Effect of slow-solvent-vapour treatment on performance of polymer photovoltaic devices     

冯志慧  侯延冰  师全民  刘小君  滕枫 《海洋学报(英文版)》2010,29(9)

In this work, enhanced poly(3-hexylthiophene):[6,6]-phenyl-C61-butyric acid methyl ester (P3HT:PCBM) bulk-heterojunction photovoltaic devices are achieved via slow-solvent-vapour treatment. The correlations between the morphology of the active layer and the photovoltaic performance of polymer-based solar cell are investigated. The active layers are characterized by atomic force microscopy and optical absorption. The results show that slow-solvent-vapour treatment can induce P3HT self-organization into an ordered structure, leading to the enhanced absorption and efficient charge transport.  相似文献   

Structural, curvature and electronic properties of Rh adsorption on armchair single-walled carbon nanotube     

杨培芳  吴锋民  滕波涛  刘莎  蒋健中 《海洋学报(英文版)》2010,29(9)

This paper systematically studies the rolling effects of the (n, n) single-wall carbon nanotubes (SWCNT) with different curvatures on Rh adsorption behaviours by using density functional theory. The outside charge densities of SWCNTs are found to be higher than those inside, and the differences decrease with the increase of the tube radius. This electronic property led to the discovery that the outside adsorption energies are higher than the inside ones, and that the differences are reduced with the increase of the tube radius. Partial density of states and charge density difference indicate that these strong interactions induce electron transfer between Rh atoms and SWCNTs.  相似文献   

三分量地震资料中各向异性检测     

张中杰  滕吉文  何樵登  魏计春  王爱武 《吉林大学学报(地球科学版)》1994,(1)

各向异性研究是当令地震学研究领域中重要课题之一；三分量地震资料中各向异性的检测是各向异性理论研究成果解决地球科学实际问题的重要桥梁。本文简要描述了各向异性介质中横波分裂现象，分别介绍了现有的四种主要检测技术，即偏振图法、协方差拒阵法、质，点振动分辨率法及传输矩阵法，并对这四种技术作了一定的评述。  相似文献   

油田井间CT技术应用试验     

刘庆芳  闫锐 《CT理论与应用研究》1994,3(4):28-33

本文记述了在扶余油田采用井间电磁波和声波ＣＴ方法进行的试验。阐述了试验的意义、理论基础、计算方法、实施方案及成果几方面。试验结果表明电磁波的工作频率应降低到至少几百ＫＨｚ以下才能适于油田应用。１００ｍ井间距的声波成像获得了成功，两个油层均有清晰显示。最后，对技术的发展提出了建议。  相似文献   

线性连续变化非弹性介质中地震波射线轨迹与走时研究     

赵国敏  白云  张中杰  滕吉文  孟补在  黄玉国 《华北地震科学》1994,(2)

地球内部非弹性介质广泛存在,垂向线性连续变化非弹性介质模型具有重要理论与实际意义,本文利用复速度概念推导得到了复速度随深度线性连续变化的非弹性介质中地震波射线轨迹与等时线方程.理论结果表明:在线性连续变化非弹性介质中,射线轨迹呈圆形,等时面的形状为椭圆.最后对射线轨迹与等时线方程的适用性条件进行了讨论.  相似文献   

西秦岭北缘断裂带新活动特征   总被引：27，自引：2，他引：27       下载免费PDF全文

滕瑞增  金瑶泉  李西候  苏向州 《地震工程学报》1994,16(2):85-90

在本文中，作者在近几年进行的大比例尺活断层地质填图工作的基础上，介绍了西秦岭北缘断裂带晚第四纪以来活动的基本待征，研究了该断裂带的空间展布情况、几何学和运动学特征、断层活动速率、古地震与地震重复周期等。结果表明，该断裂带自第四纪以来由压性逐渐演变为左旋扭动，其水平滑动速率为２．１－２．８ｍｍ／年，垂直滑动速率为０．４－０．７ｍｍ／年，地震复发周期约为５０００年。  相似文献