Locating healthcare facilities using a network-based covering location problem     

Huairen Ye  Hyun Kim 《GeoJournal》2016,81(6):875-890

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松潘-甘孜地块地壳性质再研究   总被引：2，自引：0，他引：2       下载免费PDF全文

王海燕  高锐  张季生  李秋生  管烨  李文辉  郭晓玉  李洪强 《地质科学》2016,(1):41-52

松潘-甘孜地块的基底构造性质对于探讨青藏高原的形成至关重要,备受国内外学者的关注。然而,由于松潘-甘孜地块被广泛分布的三叠纪复理石沉积所覆盖,关于松潘-甘孜地块基底属性的研究并不多见,它属于洋壳还是陆壳,至今仍在争论之中。本文利用跨越松潘-甘孜地块的深地震反射剖面、深地震测深剖面、区域航磁异常和花岗岩同位素地球化学等资料,通过综合分析研究其地球物理与地球化学特征,发现松潘-甘孜地块的下地壳存在元古代变质基底,该基底具有亲扬子地块的性质。  相似文献   

一次台风后部中尺度暴雨的动力机制分析与模拟试验     

左平昭  王伟伟  叶冬云  王超  赵一夫 《气象科技》2016,44(5):793-799

利用常规气象资料、区域自动站资料和1°×1°的NCEP再分析资料,对1209"苏拉"台风后部暴雨的动力机制进行分析,并用WRF模式进行地形模拟数值试验,结果表明:"苏拉"后部暴雨具有明显的中尺度特征,低层流场的汇合促进暴雨区上升运动的发展,超低空偏南风急流为暴雨区提供充足的水汽条件,急流在强降水发生前增强北推;陆地摩擦使近岸一带生成风速辐合线(岸风锋)是触发暴雨的中尺度系统,其强弱对暴雨强度有直接影响。  相似文献   

Advances in experimental investigation on hydraulic fracturing behavior of bentonite-based materials used for HLW disposal     

Yong-Gui Chen  Ling-Yan Jia  Wei-Min Ye  Bao Chen  Yu-Jun Cui 《Environmental Earth Sciences》2016,75(9):787

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Streamflow estimation by support vector machine coupled with different methods of time series decomposition in the upper reaches of Yangtze River,China     

Shuang Zhu  Jianzhong Zhou  Lei Ye  Changqing Meng 《Environmental Earth Sciences》2016,75(6):531

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Provenance of Clay Minerals in the Amami Sankaku Basin and Their Paleoclimate Implications Since Late Pleistocene     

Liu Huahua  Jiang Fuqing  Zhou Ye  Li Anchun 《地球科学进展》2016,31(3):286-297

We analyzed the clay mineral assemblages, content and mineralogical characteristics of Hole U1438A sediment recovered from Amami Sankaku Basin during International Ocean Discovery Program (IODP) expedition 351. The results show that the clay minerals are mainly composed of illite (average 57%), smectite (average 26%), chlorite (average 14%) and minor kaolinite(average 3%). The crystallinity of illite in all samples are good (<0.4 Δ° 2θ), and the chemical indexes of illite in all samples are low (<0.4). Both indicate that illite in Hole U1438A formed in cold and dry climate. By comparing clay mineral assemblages of hole U1438A and the potential sediment sources, we suggest that smectite be mainly derived from the volcanic materials around Amami Sankaku Basin. Illite, chlorite and kaolinite are mainly derived from the Asian dust. The ratios of (illite+chlorite)/smectite show a phased increase over the last 350 ka, which is consistent with the cold and drying trend of the Asian continent since late Pleistocene. The high ratios of (illite+chlorite)/smectite and (illite+chlorite)/kaolinite during glacial period indicate that much more Asian dust was input into the Amami Sankaku Basin, which are responded to the aridity of Asian continent and strengthened east Asian Monsoon during glacial period.  相似文献   

A Study of Global Change Population and Economic System Risk Forming Mechanism and Assessment     

Shi Peijun  Wang Aihui  Sun Fubao  Li Ning  Ye Tao  Xu Wei  Wang Jing&#x  ai  Yang Jianping  Zhou Hongjian 《地球科学进展》2016,31(8):775-781

Global climate change featured with warming has created serious challenge to world sustainable development and human security. It has become an important consensus of the international society to assess global change risk at the global scale and carry out tailored governance and risk-based adaptation. National Key Research and Development Program “Study on global change population and economic system risk forming mechanism and assessment” aims at quantitatively predicting future global climate change and population and economic system exposure and vulnerability change, developing global change population and economic system risk assessment model based on complex system dynamics, synthesizing risk assessment model with proprietary intellectual property rights, assess global change population and economic system risk of the near and mid future at the global scale, and compiling the atlas of global change population and economic system risk. The outcomes intend to serve the participation of global risk governance and international climate negotiation, and to provide scientific support to the implementation of international disaster risk reduction strategy.  相似文献   

ICP-MS测定土壤样品中Pb、Cd、Cr的不确定度评定     

江冶  曹磊 《江苏地质》2016,40(4):710-714

建立了ICP-MS测定土壤样品中Pb、Cd、Cr的不确定度数学模型,分别计算了标准储备液、校正曲线拟合、样品制备过程、分析信号强度及重复性试验等分量的不确定度,根据以上结果计算出标准不确定度。计算结果表明,不确定度主要来源于标准储备液制备和稀释以及重复性实验,该结论对分析过程质量控制、分析方法研究有一定的参考价值。  相似文献   

青海东昆仑尕林格铁多金属矿床辉石闪长岩U-Pb年代学及地球化学特征   总被引：1，自引：0，他引：1  

白宜娜  孙丰月  钱烨  刘洪川  张德明 《世界地质》2016,35(1):17-27

对青海尕林格矿区与成矿有关的辉石闪长岩的地球化学特征研究显示,该辉石闪长岩属于偏铝质、钙碱性系列岩石,明显富集活泼不相容元素Th、U和轻稀土元素,相对亏损高场强元素Nb、Ta、Ti和P,具弱的负Eu异常(δEu介于0.924~0.962)。岩石εHf(t)值为-3.79~-1.70,二阶段模式年龄为TDM2为1 223~1 339 Ma。尕林格闪长岩锆石LA-ICP-MS U-Pb加权平均年龄为228±2 Ma(MSWD=0.32),为晚三叠世。综合前人研究成果,认为在巴颜喀拉地块与东昆仑地块碰撞-后碰撞转换阶段俯冲的阿尼玛卿洋壳板片发生断离,引起地幔物质上涌至古老的下地壳底部,使其发生部分熔融并混入部分幔源物质,形成尕林格辉石闪长岩石。  相似文献   

Adsorption of Tl(I) on Na–montmorillonite and kaolinite from aqueous solutions     

Hong-Mei Deng  Yong-Heng Chen  Hong-Hai Wu  Tao Liu  Yao-Long Wang  Gao-Yuan Wu  Heng-Peng Ye 《Environmental Earth Sciences》2016,75(9):752

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