QQ客服 官方微博 反馈留言

浏览/检索结果: 共34条，第1-10条 帮助 限定条件 发表日期：2014    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 Derivation of tree stem structural parameters from static terrestrial laser scanning data 其他 2014-01-01 Wei, Tian; Lin, Yi; Liu, Yajing; Niu, Zheng 收藏  |  浏览/下载：3/0  |  提交时间：2015/11/16 terrestrial laser scanning  diameter at breast height (DBH)  the degree of stem shrinkage  the elevation angle and azimuth angle of stem inclination   Two inverse processes: Spectral reconstruction and pixel unmixing 其他 2014-01-01 Yan, Lei; Liu, Sui-Hua; Liu, Hui-Li; Jing, Xin; Cheng, Chengqi; Wang, Hong 收藏  |  浏览/下载：3/0  |  提交时间：2015/11/13 Identifiability of subgroup causal effects in randomized experiments with nonignorable missing covariates 其他 2014-01-01 Ding, Peng; Geng, Zhi 收藏  |  浏览/下载：4/0  |  提交时间：2015/11/11 bound  causal inference  expert opinion  missing data  sensitivity analysis  PRINCIPAL STRATIFICATION  BINARY OUTCOMES  DEATH  INFERENCE  NONCOMPLIANCE  TRIALS  MODELS   Selective hydrogenolysis of xylitol to ethylene glycol and propylene glycol over copper catalysts 期刊论文 applied catalysis b environmental, 2014 Huang, Zhiwei; Chen, Jing; Jia, Yuqing; Liu, Hailong; Xia, Chungu; Liu, Haichao 收藏  |  浏览/下载：3/0  |  提交时间：2015/11/10 Biomass-derived polyols  Ethylene glycol  Propylene glycol  Copper catalysts  Selective hydrogenolysis  PRECIPITATION-GEL METHOD  DEPOSITION-PRECIPITATION  POLYOL CONVERSIONS  REACTION-MECHANISM  CU/SIO2 CATALYSTS  GLYCEROL  SORBITOL  CHEMICALS  BIOMASS  1,2-PROPANEDIOL   Solid-phase extraction with the metal-organic framework MIL-101(Cr) combined with direct analysis in real time mass spectrometry for the fast analysis of triazine herbicides 期刊论文 journal of separation science, 2014 Li, Xianjiang; Xing, Jiawei; Chang, Cuilan; Wang, Xin; Bai, Yu; Yan, Xiuping; Liu, Huwei 收藏  |  浏览/下载：2/0  |  提交时间：2015/11/10 Direct analysis in real time mass spectrometry  Fast analysis  Metal-organic frameworks  solid-phase extraction  Triazine herbicides  PERFORMANCE LIQUID-CHROMATOGRAPHY  POLYCYCLIC AROMATIC-HYDROCARBONS  HIGH-RESOLUTION  WATER SAMPLES  MICROEXTRACTION  GAS  SEPARATION  ADSORPTION  PRODUCTS  MILK   Deposition velocity of PM2.5 in the winter and spring above deciduous and coniferous forests in Beijing, China 期刊论文 plos one, 2014 Sun Fengbin; Yin Zhe; Lun Xiaoxiu; Zhao Yang; Li Renna; Shi Fangtian; Yu Xinxiao 收藏  |  浏览/下载：5/0  |  提交时间：2015/11/11 Research on inventory sharing and pricing strategy of multichannel retailer with channel preference in internet environment 期刊论文 international journal of hybrid information technology, 2014 Li, Hanzong 收藏  |  浏览/下载：3/0  |  提交时间：2015/11/13 An integrated risk assessment and intercity comparison model of PAHs in ambient air of six metropolitans in China 其他 2014-01-01 Yu, Ya-Juan; Guo, Huai-Cheng; Wang, Zhen; Jiang, Yu-Mei; Liu, Yong; Huang, Kai 收藏  |  浏览/下载：3/0  |  提交时间：2015/11/13 环境参数对硝基清漆苯系物散发的影响 期刊论文 环境化学, 2014 王立鑫; 李锐; 赵子鹰; 刘兆荣; 白郁华 收藏  |  浏览/下载：4/0  |  提交时间：2015/11/11 硝基清漆  苯系物  散发  室内  nitrocellulose  benzene series  emission  indoor   Examination of disinfection by-product (DBP) formation in source waters: A study using log-transformed differential spectra 期刊论文 水研究, 2014 Yan, Mingquan; Korshin, Gregory V.; Chang, Hyun-Shik 收藏  |  浏览/下载：5/0  |  提交时间：2015/11/11 Absorbance  DBPs  Dissolved organic matter (DOM)  Halogenation  Log-transformation  DISSOLVED ORGANIC-MATTER  AQUATIC HUMIC SUBSTANCES  DRINKING-WATER  TRIHALOMETHANE FORMATION  ABSORBENCY SPECTROSCOPY  NOM CHLORINATION  THM FORMATION  BINDING  MODELS  GENOTOXICITY