阜新市收缩城市经济系统弹性演变趋势与障碍因素分析   总被引：3，自引：2，他引：1  

董丽晶  苏飞  温玉卿  王永超 《地理科学》2020,40(7):1142-1149

运用集对分析和弹性评估相结合的研究方法,以东北收缩城市阜新市为例,分析1997—2016年阜新市城市经济系统弹性变化趋势及障碍因素,并提出相应的对策建议。研究表明：阜新市经济系统弹性指数在1997—2016年总体呈现平稳增长态势,弹性值大体在0.30~0.45区间波动,这说明阜新市经济系统处于中等偏低弹性状态,经济发展整体态势较稳定;同时运用回归分析法研判阜新市经济系统的脆弱性、适应性、恢复性与弹性之间的关系,结果表明恢复性对阜新市经济系统弹性的影响居于主导地位;进一步对城市经济系统恢复性的“障碍度”分析表明,产业结构合理化程度、经济集约化程度及经济外向性是恢复性提升的主要因子。据此建议阜新市通过优化发展能源产业,提升科技创新能力,提高经济外向性,推进节能降耗和循环经济发展,努力促进绿色转型等措施提高经济恢复性,实现不断增强阜新市经济系统弹性能力的目标。  相似文献   

Genetic Relationship between Natural Gas Dispersal Zone and Uranium Accumulation in the Northern Ordos Basin, China          下载免费PDF全文

GAN Huajun XIAO Xianming LU Yongchao JIN Yongbin TIAN Hui LIU Dehan 《《地质学报》英文版》2007,81(3):501-509

The Ordos Basin is well-known for the coexistence of oil, natural gas, coal and uranium. However, there has been little research to discuss the genetic relationship between them. In this paper, a case study of the Zaohuohao area in Dongsheng, Inner Mongolia, China, is conducted to investigate the genetic relationship between the natural gas and the uranium accumulation. Fluid inclusion data from the uranium-bearing sandstone samples indicate that the fluid inclusions formed in a gas-water transition zone. Using the homogeneous temperatures of aqueous inclusions coeval with hydrocarbon-bearing inclusions, combined with the buried history and paleo-temperature data, the gas-water transition zone reached the area at about 110 Ma. On the basis of this, the contents of Uranium （U） and Total Organic Carbon （TOC） of the samples were analyzed, and there was no obvious relation between them. With regard to the available data from both publications and this study, it is found that the U mineralization has a spatiotemporal accordance with the gas-water dispersal zone. Thus, it is believed that the natural gas in the gas-water zone is an effective reducer to the U-bearing ground water abundant in oxygen, which is the main factor to U accumulation. This result can be used as the reference to the U mines predicting and prospecting.  相似文献   

电热蒸发—电感耦合等离子体原子发射光谱及其在痕量稀土分析中的应用   总被引：4，自引：0，他引：4  

江祖成  胡斌 《岩矿测试》2000,19(2):122-128

评述了电热蒸发电感合等离子体原子发射光谱分析（ＥＴＶ－ＩＣＰ－ＡＥＳ）联用技术的新近进展及其在痕稀土元素检测中的应用。从原理、分析性能、方法及应用诸方面对以聚四氟乙烯（ＰＴＦＥ）悬本为化学改进剂的氟化辅助电热蒸发（ＦＥＴＶ）－ＩＣＰ－ＡＥＳ新技术作了全面的介绍,引用参考文献２８篇。  相似文献   

The relationship between ENSO cycle and temperature,precipitation and runoff in the Qilian mountain area     

LANYongchao DINGYongjian KANGErsi ZHANGJishi 《地理学报(英文版)》2003,13(3):293-298

El Nino and La Nina are the events concerned internationally. The corresponding relationship between E1 Nino events, temperature, precipitation and runoff in the Qilian mountain area are analyzed according to the date fi‘om the weather and the hydrometric stations in the area, the results show that effects of E1 Nino events to temperature, precipitation and runoff are different in the different time and zones. When E1 Nino occurs, temperature rises, but precipitation and runoff decrease in the whole Qilian mountain area, especially in the east and middle parts of the area. Temperature rises, precipitation and runoff still decrease in the eastern Qilian mountain area in the next year El Nino occurring, but decrease extent is fewer. There are not obvious relationship between temperature,precipitation and runoff with El Nino events in the western Qilian mountain area.  相似文献   

南海西沙西科1井层序地层格架与礁生长单元特征   总被引：3，自引：0，他引：3       下载免费PDF全文

朱伟林  王振峰  米立军  杜学斌  解习农  陆永潮  张道军  孙志鹏  刘新宇 《地球科学》2015,40(4):677-687

碳酸盐岩礁滩体系是南海海域重要的油气储层之一.南海西沙岛屿全取心的科学钻井——西科1井, 为南海碳酸盐岩礁滩体系的详细研究提供极好的条件.通过西科1井岩心的宏观描述及微观分析, 结合高分辨岩心扫描及大量分析测试结果, 对碳酸盐岩礁滩体系展开了精细研究.根据识别出的6个暴露面、2个淹没面, 将西科1井中中新世以来划分为9个三级层序.其中晚中新世黄流组和第四系乐东组为主要成礁期, 以海泛面和暴露面为标志, 将礁体归纳为淹没型生长单元和暴露型生长单元两大类, 暴露型又进一步细分为硬基底和软基底两类, 淹没型可细分为快速淹没和缓慢淹没两类.垂向上形成了极具特色的礁体组合, 即慢步礁(或淹没礁)、同步礁(加积礁)、快步礁(暴露礁).研究成果对于南海生物礁生长过程及碳酸盐岩礁滩储层勘探具有重要参考价值.   相似文献   

The disastrous 23 July 2009 debris flow in Xiangshui Gully, Kangding County, Southwestern China     

Chuan Tang  Yonghong Yang  Yongchao Su  Jun Ding  Wenjie Huang 《山地科学学报》2011,8(2):131-139

On 23 July 2009, a catastrophic debris flows were triggered by heavy rainfall in Xiangshui gully, Kangding county, southwestern China. This debris flow originating shortly after a rainstorm with an intensity of 28 mm per hour transported a total volume of more than 480×103 m3 debris, depositing the poorly sorted sediment including boulders up to 2-3 m in diameter both onto an existing debris fans and into the river. Our primary objective for this study was to analyze the characteristics of the triggering ra...  相似文献   

On prevention and mechanism of bed separation water inrush for thick coal seams: a case study in China     

Hongjie Li  Qingtong Chen  Zongyun Shu  Ling Li  Yongchao Zhang 《Environmental Earth Sciences》2018,77(22):759

Bed separation can occur in overlying strata, especially in hard and soft interbedded roof strata. If these strata prone to form bed separation are rich aquifers, water can accumulate into bed separation and maybe cause a serious water hazard under the condition of water inflow passages existence. Therefore, studying these types of roof water inrush mechanisms, forecasting roof water inrush, and formulating preventive and control measures in advance are extremely important to a mine. In this paper, we takes the typical case of water inrush in the workface number 1121 at Hongliu coal mine as an example, and study the mechanism of water inrush in detail. Primarily, field drilling with water leakage and color TV observations showed that the maximum height of the water conducting fractured zone was 12.50 times the thickness of the coal seams, which spread to the overlying coarse-grained sandstone aquifer. Secondly, the numerical simulation indicated that bed separation storage space was prone to form under the combination of coarse-grained sandstone and mudstone geological structure. The detection using UWTEM revealed that the groundwater accumulated in this bed separation and formed a water bag (bed separation water). When the water bag reached a certain degree, water bursting happened with the main roof collapsing. Finally, prevention, effective drainage methods, and successful experiences with bed separation water have been summarized, and it will have a major significance to coal mines suffering from bed separation water inrush.  相似文献   

黄河流域经济联系及其网络结构演变研究     

王瑞莉  刘玉  王成新  李梦程  唐永超  薛明月 《世界地理研究》2022,31(3):527-537

黄河流域经济联系的强化及其网络结构的合理化构建,对于黄河流域生态保护与高质量发展国家战略的顺利实施具有重要意义。本文选取2006、2010、2014和2018年4个时间截面,应用修正引力模型测度黄河流域90个地市间的经济联系强度,分析其总体格局的发展演化,并运用社会网络分析法探究其网络结构演变态势。结果表明：①黄河流域经济联系水平显著提升,但地区差异显著,且经济联系强度高值的空间分布相对稳定,逐步形成以三级经济联系串联多个网络高值集聚中心的“东北-西南”轴向分布格局;②黄河流域网络密度总体呈上升态势,东、中、西地区内部及区际经济联系发展较不均衡;③流域内各地市度数中心性整体有所提高,其高值覆盖范围不断向西、向北推进,西部边缘地带则形成连片中心性低值区;④研究时段内,黄河流域内部具有明显的集群现象,但各层级子群内部构成变化较大。  相似文献   

1958~2015年疏勒河上游出山径流变化及其气候因素分析     

杨春利  蓝永超  王宁练  王启优  李亚林 《地理科学》2017,37(12):1894-1899

利用1958~2015年疏勒河出山口昌马堡水文站径流资料以及同期流域气象资料,揭示了疏勒河出山径流及其对流域气候变化的响应。结果表明：总体上,疏勒河出山径流量呈现增加趋势,特别是20世纪90年代后期以来,出山径流增加趋势更为明显,但近几年,疏勒河出山径流量缓慢回落,21世纪初暂时成为代际变化的拐点。研究亦显示,疏勒河出山径流对河源处高海拔山区气候变化的响应更为敏感,出山径流年际变化实际受到山区气候因素的共同影响,不同时段各因素影响强度具有一定差异;降水是出山径流变化的主控因素,但气温升高导致冰雪融化加快是近年来出山径流增长较快的重要原因。定量分析表明,20世纪90年代后期以来气温等对径流影响比重超过60%,而降水约为30%左右。  相似文献   

华南下扬子区下奥陶统仑山组:岩石学、地层学和古地理学^*          下载免费PDF全文

李家腾  刘建波  孙永超  闫振  吴荣昌  詹仁斌 《古地理学报》2016,18(3):411-423

华南地区下奥陶统仑山组为奥陶系最底部的岩石地层单位之一,其以大套白云岩为主要特征,广泛分布于下扬子区。通过对安徽池州洪家剖面仑山组的系统分析,并结合下扬子区多个相关剖面的资料,进一步确定仑山组岩性为白云岩、灰质白云岩和白云质灰岩,夹有部分亮晶颗粒灰岩和亮泥晶颗粒灰岩。整体上以亮晶生屑灰岩或泥晶生屑灰岩的出现作为仑山组顶界,在下扬子区内部、北部及东南部地区以白云质灰岩或灰质白云岩出现为其底界,而在下扬子区西南部大部分地区则以白云岩化出现为其底界。整个仑山组所含生物化石种类和数量较少,自下而上可建立5个牙形石带,分别是Monocostatus sevierensis带、Acanthodus lineatus-A. costatus带、Scolopodus? pseudoplanus带、Glyptoconus quadraplicatus带和Paltodus deltifer-Tripodus proteus带,推测其时代为早奥陶世特马豆克早期。仑山组主要形成于浅潮下带至深潮下带环境中,其地层总厚度和其中的白云岩厚度受到古地理因素的控制。通过岩石学特征分析,推断仑山组白云岩主要为准同生条件下的多种白云岩化作用叠加中等埋藏条件下的白云岩化形成。  相似文献