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乡镇增长与收缩对经济韧性的异质性影响与作用路径:基于人口结构视角
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作者 张娅莉 雍璐宁 +2 位作者 董蕴萱 ramamoorthy ayyamperumal 王梅梅 《西北师范大学学报(自然科学版)》 CAS 2024年第3期84-93,共10页
基于甘肃环县不同乡镇的人口特征空间分布和人口结构差异,将乡镇分为收缩型乡镇和增长型乡镇,采用模糊推理方法测算环县各乡镇经济韧性水平,运用地理加权回归方法分析乡镇经济韧性的影响因素,最后对比不同乡镇类型人口结构变化对乡镇经... 基于甘肃环县不同乡镇的人口特征空间分布和人口结构差异,将乡镇分为收缩型乡镇和增长型乡镇,采用模糊推理方法测算环县各乡镇经济韧性水平,运用地理加权回归方法分析乡镇经济韧性的影响因素,最后对比不同乡镇类型人口结构变化对乡镇经济韧性水平的影响.研究发现:收缩型乡镇和增长型乡镇的人口结构存在明显差异;环县乡镇之间经济韧性水平发展严重不均衡,乡镇经济韧性水平受人口密度、总人数、高中及以上人口比例、批发与零售业人员比例、科技人员比例、劳动年龄人口比例多个因素影响;批发与零售业人员比例和科技人员比例对于增长型乡镇经济韧性的影响较大,人口数量和质量对于收缩型乡镇经济韧性有重要作用.研究旨在将人口增减与乡镇重构相结合,为黄土高原乡镇多方位发展和城乡融合提供参考借鉴. 展开更多
关键词 人口收缩 人口结构 收缩型乡镇 增长型乡镇 经济韧性
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Micropalaeontological and Geochemical Evidence of the Late Jurassic Radiolarians Cherts of Naga Ophiolite Hill, Nagaland, Northeast-India
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作者 ramamoorthy ayyamperumal Ramasamy Sooriamuthu +5 位作者 Gnanachandrasamy Gopalakrishnan Ganga Biswa Rajkumar Perumal Prerna Gahlaut Nusrat Nazir Justine Kandathil Antony 《Open Journal of Geology》 2021年第8期356-372,共17页
We analyzed the radiolarian assemblages (pelagic sediments) and geochemical studies of 15 samples collected from Meluri district Nagaland, Naga Hills Ophiolite belt (NHO) and it consists of the Flysch Naga-Arakan-Yoma... We analyzed the radiolarian assemblages (pelagic sediments) and geochemical studies of 15 samples collected from Meluri district Nagaland, Naga Hills Ophiolite belt (NHO) and it consists of the Flysch Naga-Arakan-Yoma trough beyond the Indo-Myanmar border. It reflects one of the many components of the Himalayan Orogenic systems of Tethyan oceanic crust discovered in Nagaland at Meluri district of India and they have very well-preserved studies and can be identified to Upper Jurassic (Kimmeridgian-mid-Tithonian). As well as a continuous sequence of Kimmeridgian-mid-Tithonian, five radiolarian assemblages have been identified in this study. This is so far the first recovery of pelagic sediment assemblages (Radiolarians) from the Naga Hills Ophiolite complex. Samples of Naga Hills Ophiolite belts fell in the Sublitharenite, Litharenite, and Fe-shale Fe-sand area, and the A-CN-K diagram indicates that these sediments in the source region were exposed deep to moderate weathering conditions. In the discriminant plot, the Naga Hill-Ophiolite-Chert samples occupy the field of origin of the sediment quartzose, and the log (K<sub>2</sub>O/Na<sub>2</sub>O) versus SiO<sub>2 </sub>samples fall into the active continental marginal field, and only one sample falls into an island arch, suggesting that the tectonic framework of the Naga Hills-Chert samples was deposited in the active continental margin and the diagrams K<sub>2</sub>O/Al<sub>2</sub>O<sub>3</sub> and MgO/Al<sub>2</sub>O<sub>3</sub> illustrated the tectonic setting of the marine environment from Naga Hill Ophiolite Chert. Such findings have been consistent with the current geology of Naga Hills in the province of Nagaland. 展开更多
关键词 Geochemistry Late Jurassic RADIOLARIANS Naga Hill Ophiloite Northeast Nagaland India
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Assessment of Recent Tectonic Activity along the Yamuna Basin, Garhwal Region, NW-Himalaya, India: Based on Morphotectonic Analysis
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作者 Prerna Gahlaut Ramesh Chandra Patel +2 位作者 ramamoorthy ayyamperumal Madhusudan Sati Dinesh Chandra Nainwal 《Open Journal of Geology》 2021年第12期734-755,共22页
Decoupling between climate and tectonics, transform the elevation of earth surface regionally by denudation and displacement of land. To extract the tectonic footprints on morphology of landform, geormophometry is wid... Decoupling between climate and tectonics, transform the elevation of earth surface regionally by denudation and displacement of land. To extract the tectonic footprints on morphology of landform, geormophometry is widely accepted tool due to visible responses in Drainage architecture to an intense tectonic environment. The present morphology of Yamuna basin in the Garhwal Himalaya, India is a result of continuing crustal deformation;erosion and deposition in the area. The drainage system and geomorphic expression of topography have been significantly influenced by active tectonics in this basin. In present study, for numerical modelling to detect the influence of tectonic signals on landform, we used morphotectonic parameters, to gradient index (SL), valley floor height to width ratio (Vf), asymmetry factor (Af), basin shape index (BS) and hypsometric integral (HI), extracted from SRTM DEM with resolution of 30 m. All these morphotectonic parameters are integrated to produce an index of relative active tectonics (IRAT). The Yamuna basin is classified into three groups based on IRAT, very high (<2.0);moderate (2.0 - 2.25) and low (>2.25) based on the degree of tectonic activity. Result shows approx. 56% of Yamuna basin experience high tectonic activity. This along strike deformation pattern pronouncedly emulates subsurface geometry based tectonic model. 展开更多
关键词 Active Tectonics Landform Evolution Morphotectonic Parameters LANDSLIDE IRAT
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