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科研机构
北京大学 [29]
内容类型
期刊论文 [26]
其他 [3]
发表日期
2017 [8]
2016 [5]
2015 [3]
2014 [2]
2013 [1]
2012 [1]
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专题:北京大学
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Critical climate periods for grassland productivity on China's Loess Plateau
期刊论文
AGRICULTURAL AND FOREST METEOROLOGY, 2017
Guo, Liang
;
Cheng, Jimin
;
Luedeling, Eike
;
Koerner, Sally E.
;
He, Jin-Sheng
;
Xu, Jianchu
;
Gang, Chengcheng
;
Li, Wei
;
Luo, Ruimin
;
Peng, Changhui
收藏
  |  
浏览/下载:8/0
  |  
提交时间:2017/12/03
Aboveground net primary productivity (ANPP)
Partial least squares regression (PLS)
Precipitation
Temperate grassland
Temperature
Timing of climate variability
NET PRIMARY PRODUCTIVITY
PRECIPITATION VARIABILITY
ABOVEGROUND PRODUCTIVITY
SEASONAL PRECIPITATION
INTERANNUAL VARIATION
RAINFALL VARIABILITY
TEMPERATE GRASSLAND
TEMPORAL VARIATION
MESIC GRASSLAND
NORTH-AMERICAN
重庆市丘陵山区农村建设用地集约利用评价研究
期刊论文
水土保持研究, 2017
张志刚
;
张安明
;
郭欢欢
;
郑财贵
;
宁玉科
;
王彦美
收藏
  |  
浏览/下载:2/0
  |  
提交时间:2017/12/03
丘陵山区
农村建设用地
全排列多边形图形指示法
重庆市
hilly region
rural construction land
entire-array-polygon indictor method
Chongqing City
Understanding the accumulated cycle capacity fade caused by the secondary particle fracture of LiNi1-x-yCoxMnyO2 cathode for lithium ion batteries
期刊论文
JOURNAL OF SOLID STATE ELECTROCHEMISTRY, 2017
Li, Guangyin
;
Zhang, Zhanjun
;
Huang, Zhenlei
;
Yang, Chengkai
;
Zuo, Zicheng
;
Zhou, Henghui
收藏
  |  
浏览/下载:14/0
  |  
提交时间:2017/12/03
Secondary particle
Fracture
Capacity fade
Cathode
ACCELERATED CALENDAR
ELECTRON-MICROSCOPY
SNO2 NANOWIRE
TEMPERATURE
STRESS
PERFORMANCE
TRANSITION
LINI0.8CO0.15AL0.05O2
LINI1/3CO1/3MN1/3O2
DEGRADATION
Particulate pollution in urban Chongqing of southwest China: Historical trends of variation, chemical characteristics and source apportionment
期刊论文
SCIENCE OF THE TOTAL ENVIRONMENT, 2017
Chen, Yuan
;
Xie, Shao-dong
;
Luo, Bin
;
Zhai, Chong-zhi
收藏
  |  
浏览/下载:5/0
  |  
提交时间:2017/12/03
PM
Chemical composition
Source apportionment
Chongqing
POSITIVE MATRIX FACTORIZATION
AIR-POLLUTION
CARBONACEOUS AEROSOL
ELEMENTAL CARBON
SEASONAL TRENDS
TRACE-ELEMENTS
PM2.5 MASS
CITIES
EMISSIONS
EXPOSURE
Characterization of non-methane hydrocarbons and their sources in an industrialized coastal city, Yangtze River Delta, China
期刊论文
SCIENCE OF THE TOTAL ENVIRONMENT, 2017
Mo, Ziwei
;
Shao, Min
;
Lu, Sihua
;
Niu, He
;
Zhou, Mengyi
;
Sun, Jin
收藏
  |  
浏览/下载:5/0
  |  
提交时间:2017/12/03
NMHCs
PMF
Petrochemical industry
Source apportionment
Yangtze River Delta
VOLATILE ORGANIC-COMPOUNDS
POSITIVE MATRIX FACTORIZATION
CHEMICAL MASS-BALANCE
SOURCE APPORTIONMENT
COMPOUNDS VOCS
OZONE FORMATION
UNITED-STATES
AREA
POLLUTION
URBAN
Characteristics and source apportionment of PM2.5 during persistent extreme haze events in Chengdu, southwest China
期刊论文
ENVIRONMENTAL POLLUTION, 2017
Li, Lulu
;
Tan, Qinwen
;
Zhang, Yuanhang
;
Feng, Miao
;
Qu, Yu
;
An, Junling
;
Liu, Xingang
收藏
  |  
浏览/下载:5/0
  |  
提交时间:2017/12/03
Secondary inorganic aerosol
Hygroscopic growth
Source apportionment
Chengdu
POSITIVE MATRIX FACTORIZATION
AEROSOL OPTICAL-PROPERTIES
MEGA-CITY GUANGZHOU
PEARL RIVER DELTA
CHEMICAL-COMPOSITION
AIR-POLLUTION
PARTICULATE POLLUTANTS
ATMOSPHERIC AEROSOL
SICHUAN BASIN
URBAN
Source apportionment of Pb-containing particles in Beijing during January 2013
期刊论文
ENVIRONMENTAL POLLUTION, 2017
Cai, Jing
;
Wang, Jiandon
;
Zhang, Yanjun
;
Tian, Hezhong
;
Zhu, Chuanyong
;
Gross, Deborah S.
;
Hu, Min
;
Hao, Jiming
;
He, Kebin
;
Wang, Shuxiao
;
Zheng, Mei
收藏
  |  
浏览/下载:5/0
  |  
提交时间:2017/12/03
Lead (Pb)
Source apportionment
SPAMS
CMAQ
Beijing
SPATIAL VARIATION CHARACTERISTICS
PARTICULATE MATTER POLLUTION
ATMOSPHERIC BOUNDARY-LAYER
AEROSOL MASS-SPECTROMETRY
NONLOCAL CLOSURE-MODEL
LEAD-ISOTOPE RATIOS
SEVERE WINTER HAZE
CONTROL POLICIES
QUANTITATIVE ASSESSMENT
NORTHERN-HEMISPHERE
基于行业专有词典的TF-IDF特征选择算法改进
期刊论文
计算机应用与软件, 2017
张齐勋
;
刘宏志
;
刘诗祥
;
贾堂
;
曹健
收藏
  |  
浏览/下载:4/0
  |  
提交时间:2017/12/03
行业专有词典
特征空间
特征选择算法
TF-IDF
Industry proprietary dictionary
TF-IDF
Feature space
Feature selection algorithm
Selection of Carbon Sources for Enhancing 3D Conductivity in the Secondary Structure of LiFePO4/C Cathode
期刊论文
ELECTROCHIMICA ACTA, 2016
Yang, Xinhe
;
Tu, Jiguo
;
Lei, Min
;
Zuo, Zicheng
;
Wu, Borong
;
Zhou, Henghui
收藏
  |  
浏览/下载:5/0
  |  
提交时间:2017/12/03
LiFePO4/C
Carbon sources
Conductivity
Li-ion diffusion coefficients
Low-temperature performance
LITHIUM-ION BATTERIES
CORE-SHELL STRUCTURE
ELECTROCHEMICAL PERFORMANCE
COMPOSITE
CAPACITY
NANOTUBES
ELECTRODE
Investigation of oxygen diffusion behavior in terbium using O-18(2) isotopic tracking by high resolution SIMS
期刊论文
MATERIALS LETTERS, 2016
Li, Guoling
;
Li, Li
;
Hao, Jialong
;
Zheng, Jie
;
Tian, Wenhuai
;
Li, Xingguo
收藏
  |  
浏览/下载:1/0
  |  
提交时间:2017/12/03
Terbium
Oxidation
Diffusion
Isotopic tracers
NanoSIMS
HIGH-TEMPERATURE OXIDATION
PURE
NANOSIMS
SILICON
STEELS
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