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Laser-induced breakdown spectroscopy in Asia

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Frontiers of physics 2016年第6期11卷 231-255页

作者： zhen-zhenWang Yoshihiro Deguchi zhen-zhen Zhang Zhe Wang Xiao-Yan zeng Jun-Jie Yan State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Graduate School of Advanced Technology and Science Tokushima University Tokushima 770-8501 Japan State Key Lab of Power Systems Department of Thermal Engineering Tsinghua-BP Clean Energy Center Tsinghua University Beijing 100084 China Wuhan National Laboratory for Optoelectronics (WNLO) Huazhong University of Science and Technology Wuhan ~3007~ China

Laser-induced breakdown spectroscopy (LIBS) is an analytical detection technique based on atomic emission spectroscopy to measure the elemental composition. LIBS has been extensively studied and developed due to the non-contact, fast response, high sensitivity, real-time and multi-elemental detection features. The development and applications of LIBS technique in Asia are summarized and discussed in this review paper. The researchers in Asia work on different aspects of the LIBS study in fundamentals, data processing and modeling, applications and instrumentations. According to the current research status, the challenges, opportunities and further development of LIBS technique in Asia are also evaluated to promote LIBS research and its applications.

关键词： laser-induced breakdown spectroscopy (LIBS) quantitative analysis signal enhancement applications challenges

A highly efficient pathway to recover gold from acid aqueous solution by using an amidoxime-functionalized UHMWPE fiber

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Rare Metals 2019年第11期38卷 1105-1112页

作者： Yu-Lin Liang Chan Jin Jiang-Tao Hu zhen Liu Yan Li Jian-Rong zeng guo-Zhong Wu Xiang-Jun Wei Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

A new amidoxime-functionalized ultrahigh molecular weight polyethylene fibrous adsorbent(UHMWPEg-PAO) was used for the recovery of Au(III) from acid aqueous *** maximum experimental absorption capacity of UHMWPE-g-PAO fiber was found to be approximately 220.0 mg·g^-*** adsorption on UHMWPE-g-PAO was characterized by synchrotron radiation-based microcomputed tomography(SR-μ-CT),transmission electron microscopy(TEM),X-ray absorption near-edge structure spectroscopy(XANES) and synchrotron radiation-based Fourier transform infrared microspectroscopy(SR-FTIR).The SR-μ-CT and TEM results showed the distribution features of gold particles on the *** mechanism of Au(III) recovery from aqueous solutions by UHMWPE-g-PAO was based on the adsorbed Au(III) ions,which were reduced to metallic zero-valent gold(Au(0)) by amino groups(-NH2) in the amidoxime(AO)groups during the adsorption process,as confirmed by highresolution TEM(HRTEM) and XANES analyses.X-ray diffraction(XRD) results indicated that the incineration ashes contained metallic zero-valent *** conclusion,this amidoxime-functionalized fibrous adsorbent is a promising material for recovering gold from aqueous solution.

关键词： UHMWPE-g-PAO Adsorption mechanism Gold Reduction

CoP nanoparticles enwrapped in N-doped carbon nanotubes for high performance lithium-ion battery anodes

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Frontiers of Materials Science 2018年第3期12卷 214-224页

作者： Mengna CHEN Peiyuan zeng Yueying ZHAO zhen FANG College of Chemistry and Materials Science Anhui Normal University Wuhu 241000 China Key Laboratory of Functional Molecular Solids (Ministry of Education) Anhui Normal University Wuhu 241000 China

CoP is a candidate lithium storage material for its high theoretical capacity. However, large volume variations during the cycling processes haunted its application. In this work, a four-step strategy was developed to synthesize N-doped carbon nanotubes wrapping CoP nanoparticles （CoP@N-CNTs）. Integration of nanosized particles and hollow-doped CNTs render the as-prepared CoP@N-CNTs excellent cycling stability with a reversible charge capacity of 648 mA.h.g-1 at 0.2 C after 100 cycles. The present strategy has potential application in the synthesis of phosphide enwrapped in carbon nanotube composites which have potential application in lithium-ion storage and energy conversion.

关键词： composites nanostructures chemical synthesis electron microscopy energy storage

A Property of g-probabilities

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Acta Mathematicae Applicatae Sinica 2010年第4期26卷 567-574页

作者： Dong-mei guo zeng-jing Chen School of Economics Central University of Finance and EconomicsBeijing 100081China School of Mathematics Shandong UniversityShandong 250100China Department of Financial Engineering Ajou UniversityKorea

Most work on capacities has focused on the 2-alternating and sub *** this paper we consider the capacities-g-probabilities derived from peng＇s *** g satisfies some conditions,we show that the g-probabilities fail to ... 详细信息

关键词： BSDEs g-expectations g-probabilities 2-alternating capacities sub 2-alternating capacities

Proportional Fairness-Based Energy-Efficient Power Allocation in Downlink MIMO-NOMA Systems with Statistical CSI

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China Communications 2019年第12期16卷 47-55页

作者： Yonghai Lin zhen Yang Haiyan guo Key Laboratory of Ministry of Education in Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications

In this paper, proportional fairness(PF)-based energy-efficient power allocation is studied for multiple-input multiple-output(MIMO) non-orthogonal multiple access(NOMA) systems. In our schemes, statistical channel state information(CSI) is utilized for perfect CSI is impossible to achieve in practice. PF is used to balance the transmission efficiency and user fairness. Energy efficiency(EE) is formulated under basic data rate requirements and maximum transmitting power constraints. Due to the non-convex nature of EE, a two-step algorithm is proposed to obtain sub-optimal solution with a low complexity. Firstly, power allocation is determined by golden section search for fixed power. Secondly total transmitting power is determined by fractional programming method in the feasible regions. Compared to the performance of MIMO-NOMA without PF constraint, fairness is obtained at expense of decreasing of EE.

关键词： MIMO-NOMA energy efficiency proportional fairness fractional programming method golden section search

A New Adaptive Tracking Control Approach for Uncertain Flexible Joint Robot System

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International Journal of Automation and computing 2015年第5期12卷 559-566页

作者： zhen-guo Liu Jin-Ming Huang School of Automation Southeast University School of Engineering Qufu Normal University

The adaptive tracking problem for uncertain flexible joint robot system is studied in this paper. By utilizing the adaptive backstepping method, an adaptive controller is constructed at the beginning. By utilizing the modified adaptive dynamic surface control technique, a new adaptive controller is presented afterwards to avoid the overparametrization problem and the explosion of complexity problem existing in the adaptive backstepping method. All the signals of the closed-loop system are rendered globally/semi-globally uniformly ultimately bounded, and the tracking error can be made arbitrarily small by tuning the designed parameters. A simulation example is given to show the validity of the control algorithm.

关键词： Flexible joint robots adaptive control backsteppin

内蒙古农牧交错区典型黑土坡耕地土壤侵蚀空间分布特征

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水土保持研究 2025年第1期32卷 13-20页

作者：邹惠杰刘刚舒成博孙波刘亚张琼郭珍中国科学院教育部水土保持与生态环境研究中心黄土高原土壤侵蚀与旱地农业国家重点实验室中国科学院水利部水土保持研究所中国科学院大学西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室四川华标测检测技术有限公司

[目的]定量了解内蒙古典型黑土区土壤侵蚀速率，探究该区域土壤侵蚀空间分布特征，阐明土壤侵蚀坡面和区域空间分布规律，以期为区域水土流失治理提供参考。[方法]采集内蒙古农牧交错区（海拉尔区、额尔古纳市和牙克石市）典型黑土坡耕... 详细信息

[目的]定量了解内蒙古典型黑土区土壤侵蚀速率，探究该区域土壤侵蚀空间分布特征，阐明土壤侵蚀坡面和区域空间分布规律，以期为区域水土流失治理提供参考。[方法]采集内蒙古农牧交错区（海拉尔区、额尔古纳市和牙克石市）典型黑土坡耕地的土壤样品，利用137Cs示踪技术计算各采样点土壤侵蚀速率，结合小波分析的方法研究土壤侵蚀在坡面的分布特征。[结果]（1） 3个坡面所有采样点137Cs含量均小于背景值（1 984.24 Bq/m2）,表现为所有坡面土壤流失。（2） 3个地区的采样坡面平均侵蚀速率表现为：海拉尔[6 533.37 t/（km2·a）]>额尔古纳[4 174.35 t/（km2·a）]>牙克石[2 765.87 t/（km2·a）]。相同坡面的3个纵向断面的平均侵蚀速率相近，同一断面侵蚀速率的变异程度较高。（3）土壤侵蚀速率沿坡长呈强弱交替的周期性变化，但周期长度并不固定。大部分纵向断面存在周期长度为80～160 m和160～200 m的大小两个周期。部分纵向断面只存在一个周期长度为100～120 m的周期。[结论]该地区土壤侵蚀在坡面尺度表现为全坡面侵蚀且在纵向呈现周期性特征，在区域尺度呈现从东到西逐渐增加趋势。

关键词：土壤侵蚀典型黑土农牧交错带小波分析

Do rural highways narrow Chinese farmers'income gap among provinces?

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Journal of Integrative Agriculture 2021年第4期20卷 905-914页

作者： WENG Yan-zhen zeng Ya-ting LIN Wen-sheng China Academy of Transportation Sciences Beijing 100029P.R.China School of Economics and Management Beijing University of Chemical TechnologyBeijing 100029P.R.China School of Advanced Agricultural Sciences Peking UniversityBeijing 100871P.R.China

To achieve complete poverty alleviation,the improvement of infrastructure and living conditions is *** the flow of factors through infrastructure investment,thereby reducing the income gap among residents,has become an important focus of poverty *** of the high amount of investment in transportation infrastructure,greater attention has been paid to the income distribution effect it brings,but few studies have analysed the effect of rural highways on the income gap of *** on the panel data pertaining to 30 provinces in China from 1993 to 2013,this paper uses a fixed-effect model to test the impact of rural highways supply on the income gap of *** empirical results show that:(1)The effect of Chinese rural highways on the farmers'income gap among provinces is"U-shaped".(2)Chinese national and provincial trunk highways are helpful in narrowing the farmers'income gap among provinces.(3)The level of education,household productive fixed assets investment,level of urbanization,and level of regional economic development have multiple effects on the farmers'income gap among ***,based on the empirical analysis,the paper analyzes the mechanism of rural highways affecting the income gap of farmers from a theoretical perspective and focuses on the causes of the"U-shaped"relationship between rural highways supply and farmers'income gap.

关键词： rural highways farmers'income gap "U-shaped"curve Theil index poverty

The Ergodicity of Stochastic Partial Differential Equations with Levy Jump

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Acta Mathematica Sinica,English Series 2011年第12期27卷 2415-2436页

作者： guo Li ZHOU zhen Ting HOU College of Mathematics and Statistics Chongqing University Chongqing 401331 P. R. China School of Mathematics Central South University Changsha 410075 P. R. China

In this article, the authors prove the uniqueness in law of a class of stochastic equations in infinite dimension, then we apply it to establish the existence and uniqueness of invariant measure of the generalized sto... 详细信息

关键词： Stochastic partial differential equation Levy processes