QQ客服 官方微博 反馈留言

浏览/检索结果: 共58条，第1-10条 帮助 限定条件 发表日期：2015    专题：北京大学    第一署名单位    第一作者单位    通讯作者单位     已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 Bas-relief map using texture analysis with application to live enhancement of ultrasound images 期刊论文 ultrasound in medicine biology, 2015 Du Huarui; Ma Rui; Wang Xiaoying; Zhang Jue; Fang Jing 收藏  |  浏览/下载：5/0  |  提交时间：2015/11/13 Bas-relief filter,Canny edge detection,Edge enhancement,Field II simulation,Speckle reduction,Texture analysis,Ultrasound biomedical B-scan image   Spatial patterns of climatological temperature lapse rate in mainland China: A multi-time scale investigation 期刊论文 JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2015 Li, Yue; Zeng, Zhenzhong; Zhao, Lin; Piao, Shilong 收藏  |  浏览/下载：3/0  |  提交时间：2017/12/03 lapse rate  altitudinal gradient  air temperature  China  spatiotemporal characteristics  AIR-TEMPERATURE  CLIMATE-CHANGE  NORTHERN ENGLAND  TIBETAN PLATEAU  WEATHER   Space-time fixity and flexibility of daily activities and the built environment: A case study of different types of communities in Beijing suburbs 期刊论文 JOURNAL OF TRANSPORT GEOGRAPHY, 2015 Shen, Yue; Chai, Yanwei; Kwan, Mei-Po 收藏  |  浏览/下载：4/0  |  提交时间：2017/12/03 Space-time constraints  Built environment  Daily activities  Community types  Beijing  TRAVEL BEHAVIOR  URBAN CHINA  CONTEXT  FRAGMENTATION  GEOGRAPHIES  CONSTRAINTS  TRANSITION  MOBILITY  GENDER   The determinants of the commuting burden of low-income workers: evidence from Beijing 期刊论文 ENVIRONMENT AND PLANNING A, 2015 Zhao, Pengjun 收藏  |  浏览/下载：4/0  |  提交时间：2017/12/03 transport inequity  commuting time  spatial constraints  self-determined actions  Beijing  SPATIAL MISMATCH HYPOTHESIS  RESIDENTIAL SELF-SELECTION  URBAN-TRANSPORTATION  TRAVEL BEHAVIOR  CHINA  GENTRIFICATION  ACCESSIBILITY  MOBILITY  POLICY  LAND   Atmospheric mercury emissions from China's primary nonferrous metal (Zn, Pb and Cu) smelting during 1949-2010 期刊论文 大气环境, 2015 Ye, Xuejie; Hu, Dan; Wang, Huanhuan; Chen, Long; Xie, Han; Zhang, Wei; Deng, Chunyan; Wang, Xuejun 收藏  |  浏览/下载：3/0  |  提交时间：2015/11/13 Mercury emission inventory  Nonferrous metal smelting  Zinc  Lead  Copper  GLOBAL EMISSION  INVENTORY  OXIDATION  SMELTERS  PLANTS   Comparison of the driving forces of spring phenology among savanna landscapes by including combined spatial and temporal heterogeneity 期刊论文 INTERNATIONAL JOURNAL OF BIOMETEOROLOGY, 2015 Zhu, Likai; Southworth, Jane; Meng, Jijun 收藏  |  浏览/下载：5/0  |  提交时间：2017/12/03 Southern Africa  Savanna  Land surface phenology  Spatial panel data models  The start of the growing season (SOS)  NET PRIMARY PRODUCTION  GREEN-UP DATE  SOUTHERN AFRICA  VEGETATION PHENOLOGY  PRIMARY PRODUCTIVITY  NORTH-AMERICA  TIME-SERIES  NDVI DATA  CLIMATE  PRECIPITATION   Satellite-indicated long-term vegetation changes and their drivers on the Mongolian Plateau 期刊论文 LANDSCAPE ECOLOGY, 2015 Zhao, Xia; Hu, Huifeng; Shen, Haihua; Zhou, Daojing; Zhou, Liming; Myneni, Ranga B.; Fang, Jingyun 收藏  |  浏览/下载：5/0  |  提交时间：2017/12/03 Climate change  Human activity  Normalized difference vegetation index (NDVI)  Phenology  Vegetation activity  Mongolian Plateau  INNER-MONGOLIA  CLIMATE-CHANGE  SPRING PHENOLOGY  LAND DEGRADATION  TIBETAN PLATEAU  NORTH-AMERICA  TIME-SERIES  NDVI DATA  CHINA  STEPPE   The macroecology of phylogenetically structured hummingbird-plant networks 期刊论文 GLOBAL ECOLOGY AND BIOGEOGRAPHY, 2015 Gonzalez, Ana M. Martin; Dalsgaard, Bo; Nogues-Bravo, David; Graham, Catherine H.; Schleuning, Matthias; Maruyama, Pietro K.; Abrahamczyk, Stefan; Alarcon, Ruben; Araujo, Andrea C.; Araujo, Francielle P.; de Azevedo, Severino Mendes, Jr.; Baquero, Andrea C.; Cotton, Peter A.; Ingversen, Tanja Toftemark; Kohler, Glauco; Lara, Carlos; Guedes Las-Casas, Flor Maria; Machado, Adriana O.; Machado, Caio Graco; Alejandra Maglianesi, Maria; McGuire, Jimmy A.; Moura, Alan Cerqueira; Oliveira, Genilda M.; Oliveira, Paulo E.; Francisco Ornela 收藏  |  浏览/下载：14/0  |  提交时间：2017/12/03 Community ecology  current climate  historical climate  hummingbird biogeography  macroecology  modularity  phylogenetic signal  pollination  quantitative networks  specialization  ANIMAL MUTUALISTIC NETWORKS  SEED-DISPERSAL NETWORKS  ECOLOGICAL NETWORKS  POLLINATION NETWORKS  COMMUNITY ECOLOGY  CLIMATE-CHANGE  WEST-INDIES  SPECIALIZATION  DETERMINANTS  MODULARITY   城市住房投资及其影响因素的时空特征分析 期刊论文 现代城市研究, 2015 沈昊婧; 王福良; 陈春 收藏  |  浏览/下载：2/0  |  提交时间：2017/12/03 住房投资  时空特征  影响因素  滞后  区域差异  housing investment  spatial and temporal characteristics  inlfuencing factors  lag  regional differences   Spatial and Temporal Patterns of Global NDVI Trends: Correlations with Climate and Human Factors 期刊论文 Remote Sensing, 2015 Liu, Ya; Li, Yan; Li, Shuangcheng; Motesharrei, Safa 收藏  |  浏览/下载：4/0  |  提交时间：2017/12/03 NDVI  vegetation  spatio-temporal pattern  temperature and precipitation  human footprint  DIFFERENCE VEGETATION INDEX  TIME-SERIES  LAND DEGRADATION  SATELLITE DATA  PHOTOSYNTHETIC TRENDS  INTERANNUAL CHANGES  ECOREGIONS MAP  AMERICA  COVER  TEMPERATURE