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浏览/检索结果: 共13条，第1-10条 帮助 限定条件 专题：北京大学    第一署名单位    第一作者单位    通讯作者单位    发表日期：2015     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 Resorption efficiency of leaf nutrients in woody plants on Mt. Dongling of Beijing, North China 期刊论文 JOURNAL OF PLANT ECOLOGY, 2015 Zhang, Jianhua; Tang, Zhiyao; Luo, Yongkai; Chi, Xiulian; Chen, Yahan; Fang, Jingyun; Shen, Haihua 收藏  |  浏览/下载：4/0  |  提交时间：2017/12/03 nitrogen concentration  phosphorus concentration  senesced leaves  nitrogen resorption efficiency  phosphorus resorption efficiency  soil nutrient  climate  NITROGEN RESORPTION  PHOSPHORUS CONCENTRATIONS  FUNCTIONAL-SIGNIFICANCE  ELEVATIONAL GRADIENT  TERRESTRIAL PLANTS  SENESCING LEAVES  PATTERNS  FOREST  SOIL  PROFICIENCY   How slow is Shannon's reconstruction for bandlimited signals? 其他 2015-01-01 Han, Guodong; Li, Yingqi; Jiang, Ming 收藏  |  浏览/下载：4/0  |  提交时间：2015/11/11 Shannon&apos  Arbitrarily slow convergence  Almost arbitrarily slow convergence  CONVERGENCE  SEQUENCES  SERIES  s sampling theorem   Molecularly Imprinted Polymers as Tools for Bioassays and Biotransformation 期刊论文 advances in biochemical engineeringbiotechnology, 2015 Liu Yibin; Huang Shan; Li Zhuo; Zhao Meiping 收藏  |  浏览/下载：3/0  |  提交时间：2015/11/13 Sinusoidal phase-modulating self-mixing interferometer with nanometer resolution and improved measurement velocity range 期刊论文 APPLIED OPTICS, 2015 Xia, Wei; Liu, Qiang; Hao, Hui; Guo, Dongmei; Wang, Ming; Chen, Xuzong 收藏  |  浏览/下载：3/0  |  提交时间：2017/12/03 LASER FEEDBACK INTERFEROMETRY  DISPLACEMENT MEASUREMENT  ELECTROOPTIC MODULATOR  REFRACTIVE-INDEX  ACCURACY   Improving the Accuracy of Time-Difference Measurement by Reducing the Impact of Baseline Shift 期刊论文 IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, 2015 Zhang, Yang; Li, Zhaohui 收藏  |  浏览/下载：4/0  |  提交时间：2017/12/03 Baseline shift  double-edge method  time-difference measurement  triple-edge method  ultrasonic flow measurement  TO-DIGITAL CONVERTER  RESOLUTION   The Observation of Residual Oil Evolution During Waterflooding Using NMR D-T (2) Maps 期刊论文 APPLIED MAGNETIC RESONANCE, 2015 Qi, Yukai; Liu, Naigui; Wang, Weimin 收藏  |  浏览/下载：2/0  |  提交时间：2017/12/03 POROUS-MEDIA  RELAXATION  DIFFUSION  FLUID   A Cavityless Laser Using Cesium Cell with 459 nm Laser Pumping 其他 2015-01-01 Xue, Xiaobo; Pan, Duo; Chen, Jingbiao 收藏  |  浏览/下载：4/0  |  提交时间：2017/12/03 amplified spontaneous emission  cavityless lasers  frequency standards  CS   Effect of equivalence ratio on the velocity of rotating detonation 期刊论文 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 2015 Wang, Yuhui; Wang, Jianping 收藏  |  浏览/下载：3/0  |  提交时间：2017/12/03 Rotating detonation  Experiment  Numerical simulation  Pressure  Equivalence ratio  HYDROGEN  MIXTURES  FLOW   Adaptive Slope Walking With a Robotic Transtibial Prosthesis Based on Volitional EMG Control 期刊论文 IEEE-ASME TRANSACTIONS ON MECHATRONICS, 2015 Chen, Baojun; Wang, Qining; Wang, Long 收藏  |  浏览/下载：3/0  |  提交时间：2017/12/03 Damping control  robotic transtibial prosthesis  slope walking  terrain adaptability  volitional electromyographic (EMG) control  ANKLE PROSTHESIS  MYOELECTRIC CONTROL  MULTISENSOR FUSION  DESIGN  LOCOMOTION  AMPUTEES  KNEE  SURFACE   Combining Human Volitional Control with Intrinsic Controller on Robotic Prosthesis: A Case Study on Adaptive Slope Walking 会议论文 Chen, Baojun; Wang, Qining 收藏  |  浏览/下载：4/0  |  提交时间：2017/12/03 ANKLE-FOOT PROSTHESIS  KNEE