Temperature trend–altitude relationship in China during 1963–2012     

Danhong Dong  Gang Huang  Xia Qu  Weichen Tao  Guangzhou Fan 《Theoretical and Applied Climatology》2015,122(1-2):285-294

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Analysis of hydrological drought frequency for the Xijiang River Basin in South China using observed streamflow data   总被引：1，自引：0，他引：1  

Zhiyong Wu  Qingxia Lin  Guihua Lu  Hai He  John J. Qu 《Natural Hazards》2015,77(3):1655-1677

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Development of land use transitions research in China   总被引：3，自引：0，他引：3  

Long  Hualou  Qu  Yi  Tu  Shuangshuang  Zhang  Yingnan  Jiang  Yanfeng 《地理学报(英文版)》2020,30(7):1195-1214

With the introduction of the concept of land use transition into China, related researches have been carried out extensively in the past two decades, which enrich the knowledge of land system science. This paper describes the development of research on land use transitions in China from the perspectives of conceptual connotations, theoretical model, research methods, and research progress and prospects. With the in-depth investigation of land use transitions, the concept and connotations of land use morphology are developed and encapsulated as two kinds, i.e., dominant morphology and recessive morphology. The dominant morphology refers to the land use structure of a certain region over a certain period of time, with features such as the quantity and spatial pattern of land use types. While the recessive morphology includes the land use features in the aspects of quality, property rights, management mode, input, output and function. Accordingly, the concept of land use transition is further developed, and the theoretical model of regional land use transitions is established. Thereafter, three innovative integrated approaches to study land use transitions are put forward, i.e., multidisciplinary research framework for recessive land use transition, transect and horizontal comparison. To date, there have been 62 Ph.D. and 166 M.S. dissertations on the topic of "land use transition" in China. During 2002–2019, the National Natural Science Foundation of China has funded 48 research programs on the theme of "land use transition". As such, the Chinese scholars have adapted the concept derived from western literature to the situations and experiences in China.  相似文献   

天山地区地震学中短期预报方法研究及效能评价   总被引：3，自引：2，他引：1  

曲延军  王海涛  李莹甄  薛郁辉 《内陆地震》2000,14(4):312-323

利用多种地震活动性方法，对南北天山地区较大地震前的地震学中短期前特征进行了系统分析，并从地震活动的空间分布及时序特征两方面，提出了６个研究子区的前异常判定指标，在对种种上地震学方法的效能进行Ｒ值评分的同时，还对它们之间的盯关性进行了讨论。  相似文献   

Automatic Detection and Classification of Coronal Mass Ejections   总被引：1，自引：0，他引：1  

Ming Qu  Frank Y. Shih  Ju Jing  Haimin Wang 《Solar physics》2006,237(2):419-431

We present an automatic algorithm to detect, characterize, and classify coronal mass ejections (CMEs) in Large Angle Spectrometric Coronagraph (LASCO) C2 and C3 images. The algorithm includes three steps: (1) production running difference images of LASCO C2 and C3; (2) characterization of properties of CMEs such as intensity, height, angular width of span, and speed, and (3) classification of strong, median, and weak CMEs on the basis of CME characterization. In this work, image enhancement, segmentation, and morphological methods are used to detect and characterize CME regions. In addition, Support Vector Machine (SVM) classifiers are incorporated with the CME properties to distinguish strong CMEs from other weak CMEs. The real-time CME detection and classification results are recorded in a database to be available to the public. Comparing the two available CME catalogs, SOHO/LASCO and CACTus CME catalogs, we have achieved accurate and fast detection of strong CMEs and most of weak CMEs.  相似文献   

Paleoproterozoic Extensional Structure and Its Controlling on Mineralization in the East of Liaoning Province     

Yang Zhongzhu  CHEN Shuliang  Li Xiandong  Wang Zhongjiang  Qu Hongxiang  Gang Jiang 《世界地质(英文版)》2001,4(1)

The palaeoproterozoic extensional structure in the east of Liaoning Province underwent sub - bedding ductile shear flowing deformation with metamorphism and magmatic emplacement. The reversal structure following the processes constructed the present framework of palaeoproterozoic orogenic belt. As a result of the ductile shearing along the layers, the gold in the Liaohe group was activated, migrated upward to the interface between the Dashiqiao rock formation, which was lower green schist facies and the Gaixian rock formation, so the gold deposit was formed in the space of brittle - ductile shear zone as ductile - shear - zone - typed stratabound gold deposit.  相似文献   

植物叶硒的时空变异规律研究   总被引：1，自引：0，他引：1  

朱发庆  谭见安 《地理研究》1990,9(3):41-48

本文以加杨叶为主,首次研究了植物叶硒的时空变异规律。得出脱落前夕不久的九、十月份加杨叶能较好地反映大气硒含量水平,而其它生长期的加杨叶则一般主要反映土壤硒的含量状况。此外,还研究得到了一些其它植物老叶硒与环境的关系。  相似文献   

3-D velocity images beneath the Chinese continent and adjacent regions   总被引：6，自引：0，他引：6  

Liu Fu-Tian  Wu Hua  Liu Jian-hua  Hu Ge  Li Qiang  Qu Ke-xin 《Geophysical Journal International》1990,101(2):379-394

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CHANGING FEATURES AND TREND OF LIGHT INDUSTRY DISTRIBUTION IN NORTHEAST CHINA     

李为  曲丽霞 《中国地理科学(英文版)》1991,1(4):359-369

Modern industry in northeast China started from light industry. From the end of 19th century to 1931 was the phase of initial development of light industry in northeast China. During this period, the development of light industry gave priority to grain processing industry. After occupying northeast China, Japanese vigorously developed heavy industry to meet the needs of munitions and paid more attention to raw materials and semi-finished articles industry for the purpose of the war. Light industry was impeded and developed slowly. After the founding of New China, large-scale economic construction took place in northeast and heavy industry received prior investment and equipment. Northeast region became the first heavy industry base through several five-year plans, the development of light industry made giant strides. The present features of light industry distribution are: difference of light industry distribution, similarity of light industry structure, and imbalance of light industry development. The  相似文献   

基于MOD16的呼伦贝尔蒸散量变化分析     

曲学斌  高绍鑫  窦华山 《沙漠与绿洲气象(新疆气象)》2020,14(1):101-107

利用2001—2014年MOD16数据和气象站点资料,分析呼伦贝尔市ET、PET的时空变化特征。研究表明,呼伦贝尔市的年平均ET为310.0 mm,呈林区农区牧区分布,年平均倾向率为15.3 mm/10 a。年平均PET为1 096.0 mm,呈农区、牧区两侧向林区递减分布,年平均倾向率为-20.7 mm/10 a。牧区西部ET显著增加(P0.05)、PET显著减小(P0.05),其他地区ET、PET变化不显著。ET与PET之差在5—6月最高,该时段为呼伦贝尔市缺水最为严重的月份。结合气象因子分析,全年的PET均会受到气温的影响,而只有冬季的ET会受到气温影响,植被生长季里ET和PET都会受到相对湿度和降水的影响,生长季的日照长度也会对PET产生影响,但10 m风速与ET和PET的相关性较差。  相似文献