基于Citespace的无人机遥感研究知识图谱分析     

梁宇哲  郑荣宝  徐嘉源  郑至键 《热带地理》2019,39(2):309-317

为清晰了解国内外无人机遥感应用研究现状及发展态势,以Web of Science核心期刊为数据源,运用文献计量方法与Citespace可视化分析工具对无人机遥感研究的相关文献进行统计分析。结果表明：无人机遥感相关研究文献呈快速增长趋势,与遥感科学、工程学和影像科学摄影技术三门学科联系最为密切;美国、中国、西班牙等国家发文量较多,具备较强研究力量;中国科学院发文量最多,而西班牙最高科研理事会h指数最高,均有较大影响力;澳大利亚学者Lucieer A和西班牙学者Zarco-Tejada PJ的h指数较高,为该领域的代表性学者;无人机遥感技术包含多个研究方向,其中研究热点包括无人机遥感在农业科学和生态学等领域的应用研究、遥感影像分类方法的研究、摄影技术和计算机视觉技术的研究等三方面。  相似文献   

安徽省温泉旅游区的品牌建设与营销策略研究     

苏会  杨钊  杨效忠 《云南地理环境研究》2019,(2):37-42,74

安徽省温泉旅游区以它独有的特色和文化的魅力赢得社会广泛的关注,也吸引更多的人对温泉旅游区的品牌建设与营销策略的研究。阐述了安徽省温泉旅游资源赋存状况,并分析安徽省温泉旅游区的品牌建设与营销策略现状。得出如下主要结论:(1)安徽省温泉多数位于隆起的大别山区、长江沿岸的巢湖—和县一带以及皖南地区;(2)产品开发利用层次不一,大多处于中程度利用;(3)温泉相关的旅游区品牌建设与营销策略相对滞后。最后在此基础上,提出现阶段安徽省温泉旅游区的品牌建设与营销策略的对策。  相似文献   

福州市地表温度热点及时空变化分析     

陈冰倩  张友水  程璟媛  赵雪 《地球信息科学学报》2019,21(5):710-719

中国作为世界第一大发展中国家,近年来城镇化发展迅速,大量自然地表转化为人工地表,从而引起了一系列环境问题,其中以城市热岛问题最为显著。因此如何缓解因城市化进程的加快引起的城市热岛效应已成为热门研究方向。为精确分析城市空间格局对热集聚的影响,本研究利用2000年5月4日的Landsat ETM+和2016年7月27日获取的Landsat OLI两期遥感影像,获取福州市的土地覆盖信息并进行精度验证。在地表温度（Land Surface Temperature, LST）反演基础上通过热点分析（Getis-Ord Gi*）,并结合不透水面（Impervious Surface Area, ISA）信息来研究城市化进程中福州市16 年来 LST的变化特性,空间集聚特性及其产生的尺度效应。热点分析结果显示：① 通过分析福州市内各地和热点中心的距离与LST的关系可较好地反映空间热聚集。2000 年在距热点中心0.97、1.03、0.95 km范围内热聚集明显;2016 年则增长到分别在距热点中心半径1.89、2.01、2.10、2.05、2.13 km范围内热集聚显著且热点区数量也从3 个增加至5 个。热集聚区（热点区和较热区）总面积在此期间从15.7%增至47.3%;② 由于热点图中的热点区和冷点区的形成不单取决于LST的高低,因此热点分析与空间自相关分析方法相比,能更直观地分析土地覆盖变化对LST的影响,了解城市内部热强度变化的细节。本研究采用的热点分析方法可用于城市环境保护与规划,将来还可作为城市土地规划与热环境影响的分析依据。同时可利用热点分析图模拟城市微气候,估算城市绿地降温程度等。此外,未来还可基于此进一步探讨更多时相以及不同城市的对比分析,特别是对不同城市类型如带状城市,多中心城市及中心城市等的研究。  相似文献   

A culture-dependent survey of thermophilic bacteria from hot springs in Xiamen area in China     

YANG Bo  OUYANG Jianping  AO Jingqun  CHEN Xinhua 《海洋学报(英文版)》2009,28(1):62-71

Microbes are believed to play important roles in ecosystem function in many environments. The hot springs of Xiamen Island are close to the Xiamen Sea, and may have some characteristics different from those of inland hot springs. Microbes living in the hot springs of Xiamen may have new characteristics. However, little is known about microbial communities of hot springs close to the Xiamen Sea. A culturedependent survey of microbial population in the Xiamen hot springs was performed by using an approach combining total cellular protein profile identification and 16S rRNA gene sequencing. A total of 328 isolates of bacteria were obtained from liquid and sediment samples from the Xiamen hot springs, including neutrophilic thermophilic bacteria and moderately thermophilic acidophiles. Neutrophilic thermophilic bacteria, which grow at a temperature range of 55—90℃ including Rhodothermus marinus (Strain 1), Thermus thermophilus (Strain 2), Thermus thiopara (Strain 3), Geobacillus stearothermophilus (Strain 4), Geobacillus thermoleovorans (Strain 5), and Pseudomonas pseudoalcaligenes (Strain 6), were recovered by 2216E plates. Moderately thermophilic acidophiles, which can grow at temperatures above 50℃ and a pH range of 1.8—3.5 such as Alicyclobacillus acidoterrestris (Strain 8), Sulfobacillus acidophilus (Strain 9), and Sulfobacillus thermosulfidooxidans (Strain 10), were isolated on selective solid medium containing sulfur and Fe2+. Among these strains, Rhodothermus marinus, Thermus thermophilus and Geobacillus stearothermophilus are not only thermophiles, but also halophiles. One bacterium strain (Strain 6) shared 99% nucleotide sequence homology with Pseudomonas pseudoalcaligenes on the 16S rRNA gene sequence, but was quite different from Pseudomonas pseudoalcaligenes in biological characteristics, suggesting that it may represent a novel thermophilic species. Results indicated that various species of neutrophilic thermophiles and moderately thermophilic acidophiles were widely distributed in the Xiamen hot springs and that Rhodothermus marinus and Thermus thermophilus dominated the cultivable microbial community.  相似文献   

前期印度洋海温异常对中国春季降水的影响   总被引：2，自引：0，他引：2  

陈丹  朱克云  布和朝鲁 《成都信息工程学院学报》2012,27(5):479-484

为了进一步认识印度洋海温的异常变化与中国降水的关系,采用SVD分析、相关分析及合成差值分析讨论了前期冬季关键区海温的异常变化对中国春季降水影响的差异,探讨了产生这种影响的原因。结果表明:前期冬季关键区海温的异常增高(降低),会造成后期春季中国华北往南到华中、华东、华南东部及西北的新疆地区的降水明显增多(减少),西南的四川、贵州及华南的广西等地降水会有所减少(增多)。与关键区冷年相比,在关键区的暖年,环流形势反映出东欧槽显著减弱,北方气压显著降低,蒙古高压明显减弱,冷空气南下更为明显,而华南东部、华中、华东及华北一直被较为显著的南风气流控制,海洋的暖湿气流向中国内陆输送更为显著,使得东部及中部大部分地区水汽较为充沛,形成大面积的降水。  相似文献   

Electrochemical corrosion behavior of hot dip coating in artificial seawater     

孙虎元  侯保荣  马士德  魏绪钧 《中国海洋湖沼学报》1999,17(2):181-186

INTR0DUCnONAlloycoatingscandetivelyproteCtsteelagainstcormsioninseri0uscormsionenvir-orunent,suchasthedrinesplashandtidalzones-TwoInainhodiptincaldrinumalloycOaingswidelyusedcommroiallyareGalfancoaing(contalningZn-5wt%kl-us)devel-oPedbytheIntemaionaltalZincReenhheZaionandhocoating(c0n-talningZn-55Wt%Al-1.6Wt%Si)develoPedbytheBethlehemSteelCorpOration-Anewrinc-basedalloycOaingdevel0PedbyNortheaStemUniversityisdiscussedinthesPaperbyelecthehendcalmethod.FromSun(l996),welmOWthecorms…  相似文献   

Impact of water environmental characteristics in Dry-Hot valley of Jinsha river on soil desertification   总被引：1，自引：1，他引：0  

刘刚才  刘淑珍 《中国地理科学(英文版)》1999,9(2):189-192

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南极涛动异常及其对冬春季北半球大气环流影响的数值模拟试验   总被引：14，自引：0，他引：14       下载免费PDF全文

范可  王会军 《地球物理学报》2007,50(2):397-403

利用IAP9L-AGCM模式考察了模式中与南极涛动异常相关的海温敏感区,发现南半球高纬海温异常能够强迫出南极涛动异常,而赤道东太平洋海温异常与太平洋南美型密切相关.研究了南极涛动异常对冬春季北半球大气环流及亚洲北部气温的影响,结果表明,南极涛动加强,能够引起北半球高纬环流异常和欧亚西风加强,以及亚洲北部地表气温和850 hPa气温显著增温.数值模拟支持了已有的诊断结果,也证实了冬春季节南极涛动异常下两半球高纬间的经向遥相关存在.  相似文献   

Parallelization of the distinct lattice spring model     

Gao‐Feng Zhao  Jiannong Fang  Liang Sun  Jian Zhao 《国际地质力学数值与分析法杂志》2013,37(1):51-74

The distinct lattice spring model (DLSM) is a newly developed numerical tool for modeling rock dynamics problems, i.e. dynamic failure and wave propagation. In this paper, parallelization of DLSM is presented. With the development of parallel computing technologies in both hardware and software, parallelization of a code is becoming easier than before. There are many available choices now. In this paper, Open Multi‐Processing (OpenMP) with multicore personal computer (PC) and message passing interface (MPI) with cluster are selected as the environments to parallelize DLSM. Performances of these parallel DLSM codes are tested on different computers. It is found that the parallel DLSM code with OpenMP can reach a maximum speed‐up of 4.68× on a quad‐core PC. The parallel DLSM code with MPI can achieve a speed‐up of 40.886× when 256 CPUs are used on a cluster. At the end of this paper, a high‐resolution model with four million particles, which is too big to handle by the serial code, is simulated by using the parallel DLSM code on a cluster. It is concluded that the parallelization of DLSM is successful. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   

论宁夏金场子渗流热卤水-表生改造型金矿床的矿源     

徐国风 《地球科学》1988,(2)

稳定同位素、岩石微量元素(金)和地质特征研究的结果,表明金场子金矿床的成矿物质来源系上地壳源,并且金、银、铅、铜等金属和硫、硒、砷、氯、氟、碳等来源于石炭纪和泥盆纪沉积岩。成矿流体是大气水和沉积地层水的混合溶液。金矿化与地热流体渗流热卤水成矿作用和表生风化成矿作用有关。  相似文献