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从战略目标、主业定位、理顺事企关系的思路和途径、组织架构、管理制度等方面简述了“江南模式”的主要内容,分析了“江南模式”的特点,即具有实践性又有理论性,既有特殊性又有普适性,既有现实性又有动态性,指出“江南模式”的推行对于广东煤炭地质局的改革和发展,对于地勘单位加强战略研究和主业定位,理顺事企关系,提升管理水平有一定的参考价值。 相似文献
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Lü Delin 《中国地质大学学报(英文版)》2001,12(4)
Since Dow (l972) proposed the concept of oil system atthe AAPG annual meeting in l972, after unremitting effol.tsand progressive perfection, it has become the petroleum systemaccepted by numerous geologists at present. The concept of pe-troleum system was introduced to our country in early l990s(I)ou, l999). In fact, as early as the 1960s, based on the hy-drocarbon exploration and development practice at Songliao ba-sin and Bohai Bay basin, some viewpoints similar to petroleumsystem have be… 相似文献
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Concentrations of contaminants in surface water samples collected in west-central Indiana impacted by acidic mine drainage 总被引：1，自引：0，他引：1
The results of analyses of surface waters collected from a variety of locations in west-central Indiana indicate extensive contamination by acidic mine drainage. These samples had pH values as low as 2.1 and total iron concentrations as high as 1200 mg1–1. The speciation of iron, expressed as the ratio [Fe(II)]/[Fe(III)] ranged from 0.08 to 8.27. Measured lead concentrations were as high as 811 mgl–1. In addition, the concentrations of nitrate and sulfate ions were as high as 359 and 624 mgl–1, respectively. 相似文献
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《水经注》中有关北京地理的科学思想 总被引：1，自引：0，他引：1
《水经注》是我国古代著名的地理学著作之一,作者郦道元是北魏时期范阳(涿州—北京)人,因此书中对北京附近的水系和地理情况进行了描述。书中称拒马河为巨马水、大石河为圣水、永定河为漯水、清水河为清夷水、温榆河为湿馀水、潮白河为鲍邱水、泃河为泃水,称永定河出山段为清泉河、流经北京城内的什刹海和中南海为高粱河。对家乡附近的地理进行了描述,称房山为大房岭、石景山为梁山,记录了昌平县、密云戍、平谷县等行政区域,记录了羊头埠(羊头岗)、马兰(马栏)、芹城(秦城)、独乐水(独乐河)、良乡、居庸关、盘山等地名。记录了中国最早的首都——涿鹿,记录了中国现代首都蓟城(北京)内曾有蓟丘,说明永定河沟通了古今首都。记录了北京最早的水利工程戾陵堰和车箱渠。 相似文献
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用化学物相分析法测定瓮福磷尾矿中钙、镁、磷元素形态含量。结果表明,磷尾矿中钙主要以白云石的形式赋存,并有少量以方解石、磷酸盐形式存在;镁主要以白云石的形式赋存,并有少量以磷酸盐、硅酸盐形式存在;磷主要以磷灰石的形式赋存,并有少量以铁氧化物、独居石、磷钇矿形式存在。各元素形态加标回收率为97.6%~107.2%,相对标准偏差(RSD,n=12)为0.77%~4.85%。各元素形态分析结果表现出较好的稳定性,表明采用化学物相分析法测定瓮福磷尾矿中钙、镁、磷元素形态含量结果准确可靠。 相似文献
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Natural Hazards - Cyclone tracks over the Great Lakes of North America shift, both East–West as well as North–South. The reasons for the shifts are various small-scale as well as... 相似文献
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吉林省四平市山门银矿成矿地质条件分析 总被引：1，自引：0，他引：1
本文对吉林省四平市山门银矿的成矿地质条件从地层、构造、岩浆活动、冷水蚀变等四个方面进行了分析。结果认为，上述四个方面为该矿的成矿物质来源、成矿物质的富集沉淀、导矿和储矿等提供了必备的物理条件和化学条件。 相似文献
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本文简述地震前兆观测场的要求 ,福建数字地震前兆台网在依据观测场的要求是如何合理分布各观测点。并着重阐述了数字地震前兆台网仪器观测技术系统的组成 ,前兆台网仪器安装过程及仪器安装过程需注意的事项。对福建数字地震前兆台网的安装做了小结。对此次仪器安装过程所遇到的问题如何合理摆放仪器、规范综合布线、传感器密封、避雷地线等做了几点建议。笔者结合多年的维修实际操作经验 ,对地震前兆仪器的设计如何提高仪器标准化、集成化、为维修的方便提出几点思考建议。 相似文献
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激光剥蚀-电感耦合等离子体质谱准确测定锆石中钛的含量 总被引：2，自引：2，他引：0
外标物质及内标元素的选择是激光剥蚀-电感耦合等离子体质谱(LA-ICP-MS)准确测定元素含量的关键因素之一。文章选用玻璃标准参考物质NIST 610、GSE-1G、BHVO-2G、BCR-2G、ATHO-G、KL2-G和T1-G作为外标,Si或Zr作为内标,对锆石M257中的Ti进行LA-ICP-MS微区原位测定。结果显示,选择Si或Zr作内标,采用BCR-2G、ATHO-G、KL2-G和T1-G作外标时,Ti含量测定值与参考值之间差异均较大,因此它们不适合作外标物质。采用BHVO-2G作外标和Si作内标,NIST 610作外标和Zr作内标,Ti含量测定值与参考值之间的差异均小于4%,因此BHVO-2G和NIST 610可有条件地作为外标物质。选择Si还是Zr作内标,GSE-1G作外标时,Ti含量的测定值与参考值之间的差异均小于3%,说明GSE-1G是较为合适的外标物质。选用GSE-1G作为外标,Si作内标,对5个标准锆石中的Ti含量进行了测定,结果显示,Ti元素在锆石91500中分布不均匀,而在锆石GJ-1、M257、PENGLAI和MUDTANK中分布均匀。在Ti元素分布均匀的GJ-1、M257、PENGLAI和MUDTANK等4个锆石中,由于Ti的含量均小于5μg/g,不适合作为锆石中Ti元素测定用的外标物质,但可作为测定时的质量监控样品。 相似文献
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M. Iovea G. Oaie C. Ricman G. Mateiasi M. Neagu S. Szobotka O.G. Duliu 《Engineering Geology》2009,103(3-4):119-126
An X-ray multi-purpose dual-energy computer tomograph has been used to investigate a variety of objects of geological interest such as unconsolidated sediments (sand, silt, clay, mud) and/or metamorphic rock samples. By using an appropriate set of standard materials as well as a proper version of filtered back projection reconstruction algorithms, we have obtained for each studied sample two images, depicting with an error of 2 to 3% densities as well as the effective atomic number. In the case of unconsolidated sediment samples, the computer tomograph has been also used to obtain good quality radiographs, prior to obtaining the tomographic images of the cross-sectional area of interest. Both radiographs and computer axial tomography images had a spatial resolution of 0.4 to 0.5 mm. Digital radiographs as well as tomographic images of unconsolidated sediment samples show with clarity internal features such as grain sizes, laminae thickness and orientation, bioturbations, revoked materials or fragments of wood. Computer tomography analysis of rock samples reveals rheological features in the relationship with metamorphism and deformation, image contrast regarding density and atomic effective number of constituents, as well as significant correlations between physical parameters and internal structures or textures. 相似文献
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《Geoforum》2017
Research on international student’s post migration plans treats migration as a binary stay-return category and focuses on push-pull factors as the cause of this migration. In this paper we expand the definition of migration and consider the role of life experiences and aspirations, particularly the concept of home. We ask, what are the different conceptualizations of home and how are these tied to differential migratory plans? We analyze data from 232 interviews with international students from more than 50 countries who attended a flagship public university in Canada from 2006–2013.We find that students have four ways of thinking about home: as host, as ancestral, as cosmopolitan, and as nebulous. These understandings of home correspond to particular post-migration plans. While students who view home as a host plan to stay, and those who view home as ancestral plan to return, those with cosmopolitan and nebulous conceptions of home have more open migration plans. 相似文献
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An attempt at flotation of fine grains of zinc carbonate using potassium ethylxanthate as the collector and sulphydryl and copper ions as the activators has been undertaken. Results of the flotation tests have been interpreted in terms of the adsorption of activating agents as well as the grain size effect. 相似文献
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滇池流域石漠化特征分析 总被引：2，自引：2，他引：0
位于云南省会昆明盆地内的滇池流域是滇中岩溶和石漠化较为发育的地区,石漠化总面积225.56 km2,占流域总面积的7.71%,占岩溶总面积32.69%。石漠化主要分布在望海山、大板桥—呈贡、黑林铺、海口、梁王山、上蒜片区,其中又以北东部的大板桥片区石漠化最为严重。石漠化已造成流域内水土流失加剧、可耕地面积减少、土壤涵养水源能力降低及生态环境恶化等危害。通过地面调查和ETM遥感解译,查清了流域内石漠化的发育分布与碳酸盐岩的岩性及其组合、岩溶作用、地形地貌、气象等自然因素、人为因素和工业污染关系密切。针对石漠化的形成原因,提出了生态修复、农田基本建设、水资源开发利用、农村能源建设、小集镇建设、土地合理利用等治理措施。 相似文献
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Polished and thin section examinations of samples from Indiana Coal Bed V (Springfield) have shown three sulfides to be present; namely pyrite, marcasite and sphalerite. Pyrite and marcasite are dominant forms whereas sphalerite is very minor. These sulfides appear to have formed in four distinct stages as judged on the basis of mineralogy and mineral texture. Pyrite occurs as framboids throughout the coal seam, as fibrous crystals in two horizons of the coal and in massive form as cleat fillings and cell fillings in fusinite and semi-fusinite. Marcasite occurs in spherical polycrystalline and twinned grains, as polycrystalline overgrowths on framboids, as cementing material for clusters of framboids, as blocky polycrystalline grains and with pyrite as cell fillings in fusinite and semi-fusinite. Sphalerite occurs exclusively as cell fillings in semi-fusinite. The paragenetic sequence indicates fluctuations in the overall coal bed chemistry. Individual sections display evidence of chemical variation on the micro scale. 相似文献
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贵州牛角塘镉锌矿床中发现原生硫镉矿 总被引：4，自引：0，他引：4
在贵州牛角塘镉锌矿床中既有次生硫镉矿的存在，也发现了原生硫镉矿。硫镉矿的产状如下：①呈包裹体形式产于硫化物中；②以不规则晶粒赋存于硫化物粒间：③形成硫镉矿．方铅矿细脉或硫镉矿微脉穿插硫化物；④分布在黄铁矿中方铅矿或闪锌矿周围；⑤被菱锌矿胶结并交代，形成硫镉矿残骸状角砾；⑥组成菱锌矿．硫镉矿疏松集合体或菱锌矿．硫镉矿细脉；⑦呈皮壳状或薄膜状分布在氧化矿石表面或裂隙面上。前五种形式产出的硫镉矿为原生硫镉矿，主要分布在原生矿石或弱氧化的矿石中。后两种产状的硫镉矿为次生硫镉矿，分布于氧化矿石晶洞中或矿石表面和裂隙面上。并从Cd、Zn地球化学特性、热力学和结晶化学性质探讨了原生硫镉矿形成机制。 相似文献
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C. M. O. Nwaiwu I. B. K. Alkali U. A. Ahmed 《Geotechnical and Geological Engineering》2006,24(2):283-298
A laboratory investigation was conducted to determine properties of five samples of ‘oolitic ironstone’ lateritic gravel aggregates
which are relevant to their use as road construction materials. Measured values of physico-chemical, physico-mechanical as
well as index properties and compaction characteristics are similar to those of other lateritic, gravels occurring in West
Africa which are used in road pavement applications. These lateritic clayey gravels have good workability as engineering construction
materials and are rated fair to good as road aggregates in terms of probable in-situ behaviour based on water absorption values. Relationships between maximum dry unit weight and optimum moisture content as
well as those between California bearing ratio and some derived soil parameters such as grading modulus, plasticity product
or plasticity modulus can be described using a third-order polynomial function. The maximum dry unit weight has a bimodal
frequency distribution and can be predicted from logarithm to base 10 of compaction energy with fairly good accuracy. 相似文献