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科研机构
北京大学 [413]
内容类型
期刊论文 [360]
其他 [52]
会议论文 [1]
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2017 [51]
2016 [51]
2015 [45]
2014 [35]
2013 [16]
2012 [25]
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专题:北京大学
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Elderly Migration in China: Types, Patterns, and Determinants
期刊论文
JOURNAL OF APPLIED GERONTOLOGY, 2017
Dou, Xiaolu
;
Liu, Yujun
收藏
  |  
浏览/下载:11/0
  |  
提交时间:2017/12/03
China
elderly migrants
long-distance migrate
short-distance migrate
migration pattern
RURAL-URBAN MIGRATION
INTERNAL MIGRATION
RESIDENTIAL-MOBILITY
HEALTH
IMPACTS
PLACE
Assessing Agricultural Drought Vulnerability by a VSD Model: A Case Study in Yunnan Province, China
期刊论文
SUSTAINABILITY, 2017
Wu, Jiansheng
;
Lin, Xin
;
Wang, Meijuan
;
Peng, Jian
;
Tu, Yuanjie
收藏
  |  
浏览/下载:9/0
  |  
提交时间:2017/12/03
agricultural drought vulnerability
VSDmode
factor contributionmethod
Yunnan Province
CLIMATE-CHANGE
RISK
FRAMEWORK
DISASTERS
HAZARD
MAIZE
WHEAT
Delayed response of spring phenology to global warming in subtropics and tropics
期刊论文
AGRICULTURAL AND FOREST METEOROLOGY, 2017
Chen, Xiaoqiu
;
Wang, Lingxiao
;
Inouye, David
收藏
  |  
浏览/下载:111/0
  |  
提交时间:2017/12/03
Global warming
Leafing and flowering
Process-based phenology model
Chilling and forcing requirement
Spatiotemporal prediction
CLIMATE-CHANGE
TEMPERATE TREES
NORTHERN CHINA
LEAF PHENOLOGY
UNIFIED MODEL
BUDBURST
PREDICTION
GERMANY
BOREAL
PLANTS
An Improved Estimation of Regional Fractional Woody/Herbaceous Cover Using Combined Satellite Data and High-Quality Training Samples
期刊论文
REMOTE SENSING, 2017
Liu, Xu
;
Liu, Hongyan
;
Qiu, Shuang
;
Wu, Xiuchen
;
Tian, Yuhong
;
Hao, Qian
收藏
  |  
浏览/下载:8/0
  |  
提交时间:2017/12/03
vegetation fractional cover
semi-arid area
MODIS
satellite data integration
spatial sampling design
image classification
Random Forest regression
model performance evaluation
LAND-COVER
INNER-MONGOLIA
MODIS DATA
VEGETATION
SURFACE
STEPPE
FOREST
COEXISTENCE
TOPOGRAPHY
TRANSITION
城乡结合部农业地域功能实现程度及变化趋势——以北京为例
期刊论文
地理研究, 2017
刘玉
;
冯健
收藏
  |  
浏览/下载:4/0
  |  
提交时间:2017/12/03
城乡结合部
地域功能
农业多功能
实现程度
变化趋势
rural-urban fringe
regional function
multi-functionality of agriculture
execution
change
基于社交网络签到数据的城市空间相互作用和节点吸引力研究
期刊论文
北京大学学报 自然科学版, 2017
贺泽亚
;
吴必虎
;
刘瑜
收藏
  |  
浏览/下载:13/0
  |  
提交时间:2017/12/03
地理位置签到
空间相互作用
引力模型
节点吸引力
优化粒子群法(PSO)
location-based
check-in
spatial interaction
gravity model
nodal attraction
PSO
Urban air pollution and health risks of parent and nitrated polycyclic aromatic hydrocarbons in two megacities, southwest China
期刊论文
ATMOSPHERIC ENVIRONMENT, 2017
Zhuo, Shaojie
;
Du, Wei
;
Shen, Guofeng
;
Wang, Rui
;
Pan, Xuelian
;
Li, Tongchao
;
Han, Yang
;
Li, Yungui
;
Pan, Bo
;
Peng, Xing
;
Cheng, Hefa
;
Wang, Xilong
;
Shi, Guoliang
;
Xing, Baoshan
;
Tao, Shu
收藏
  |  
浏览/下载:119/0
  |  
提交时间:2017/12/03
Urban air pollution
PAHs
Nitrated PAHs
Southwest China
Non-priority PAHs
Risk assessment
OXY-PAH EMISSIONS
CANCER-RISK
TIBETAN PLATEAU
NORTHERN CHINA
SOURCE APPORTIONMENT
SPATIAL-DISTRIBUTION
ORGANIC POLLUTANTS
SEASONAL-VARIATION
WOOD COMBUSTION
AMBIENT AIR
Variability and quasi-decadal changes in the methane budget over the period 2000-2012
期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2017
Saunois, Marielle
;
Bousquet, Philippe
;
Poulter, Ben
;
Peregon, Anna
;
Ciais, Philippe
;
Canadell, Josep G.
;
Dlugokencky, Edward J.
;
Etiope, Giuseppe
;
Bastviken, David
;
Houweling, Sander
;
Janssens-Maenhout, Greet
;
Tubiello, Francesco N.
;
Castaldi, Simona
;
Jackson, Robert B.
;
Alexe, Mihai
;
Arora, Vivek K.
;
Beerling, David J.
;
Bergamaschi, Peter
;
Blake, Donald R.
;
Brailsford, Gordon
;
Bruhwiler, Lori
;
Crevoisier, Cyril
;
Crill, Patrick
;
Covey, Kristofer
;
Frankenberg, Christian
;
Gedney, Nicola
;
Hoeglund-Isaksson, Lena
;
Ishizawa, Misa
;
Ito, Aki
收藏
  |  
浏览/下载:109/0
  |  
提交时间:2017/12/03
GLOBAL ATMOSPHERIC ETHANE
NATURAL-GAS PRODUCTION
PROCESS-BASED MODEL
CH4 EMISSIONS
FOSSIL-FUEL
GROWTH-RATE
INTERANNUAL VARIABILITY
TERRESTRIAL ECOSYSTEMS
BIOGEOCHEMISTRY MODEL
SURFACE MEASUREMENTS
以出行路径耗时为测度的城镇体系空间结构研究
期刊论文
经济地理, 2017
杨震
;
吕斌
;
王晶
收藏
  |  
浏览/下载:110/0
  |  
提交时间:2017/12/03
城镇体系
空间结构
出行路径耗时
紧凑度
urban system
space structure
travel time on paths
compactness ratio
The Uncertainty of Nighttime Light Data in Estimating Carbon Dioxide Emissions in China: A Comparison between DMSP-OLS and NPP-VIIRS
期刊论文
REMOTE SENSING, 2017
Zhang, Xiwen
;
Wu, Jiansheng
;
Peng, Jian
;
Cao, Qiwen
收藏
  |  
浏览/下载:5/0
  |  
提交时间:2017/12/03
nighttime light
DMSP-OLS
NPP-VIIRS
PKU-CO2
CO2 emissions
uncertainty
ELECTRIC-POWER CONSUMPTION
SATELLITE IMAGERY
COMPOSITE DATA
URBAN FORM
POPULATION
IMPACT
SCALES
SPACE
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