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ERROR ANALYSIS AND GLOBAL SUPERCONVERGENCES FOR THE SIGNORINI PROBLEM WITH LAGRANGE MULTIPLIER METHODS

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Journal of Computational Mathematics 2002年第1期20卷 79-88页

作者： ping luo Guo-ping Liang Department of Computer Science Tsinghua UniversityBeijing 100084China Institute of Mathematics Academy of Mathematics and SystemChinese Academy of SciencesBeijing 100080China

Focuses on a study on the finite element approximation of the Signorini problem by using Lagrange multiplier methods with piecewise constant elements. Formulation of the algorithm and error estimates; Global superconv... 详细信息

关键词： Lagrange multipliers elastic contact error estimates superconvergences

DOMAIN DECOMPOSITION METHODS WITH NONMATCHING GRIDS FOR THE UNILATERAL PROBLEM

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Journal of Computational Mathematics 2002年第2期20卷 197-206页

Focuses on the construction of domain decomposition methods (DDM) with non-matching grids based on mixed finite element methods for the unilateral problem. Information on DDM with nonmatching grids; Discussion on doma... 详细信息

关键词： domain decomposition variational inequality global superconvergence nonmatching grids

Variable stars in the open cluster NGC 2141

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Research in Astronomy and Astrophysics 2015年第5期15卷 733-741页

作者： Yang-ping luo School of Physics & Electronic Information China West Normal University Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of Sciences

We report the results of a search for variable stars in the open cluster NGC 2141. Ten variable stars are detected, among which nine are new variable stars and they are classified as three short-period W UMa-type eclipsing binaries, two EA- type eclipsing binaries, one EB-type eclipsing binary, one very short-period RS CVn- type eclipsing binary, one d-type RR Lyrae variable star, and one unknown type of variable star. The membership and physical properties are discussed, based on their light curves, positions in the color magnitude diagrams, spatial locations and periods. A known EB-type eclipsing binary is also identified as a blue straggler candidate in the cluster. Furthermore, we find that all eclipsing contact binaries have prominent asymmetric eclipses and display the O＇Connell effect, which increases with a decrease in orbital periods. This suggests that the O＇Connell effect is probably related to the evolution of the orbital period in short period eclipsing binary systems.

关键词： stars binaries general -- open clusters and associations individual (NGC 2141) -- variables general

An Adaptive Voltage Scaling Buck Converter with Preset Circuit

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Chinese Journal of Electronics 2019年第2期28卷 229-236页

作者： luo ping WANG Dongjun PENG Xuanlin State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China

An Adaptive voltage scaling(AVS)buck converter with Preset circuit(P-AVS), which can adaptively scale the output voltage fast, is *** voltage scaling loop in the proposed Pulse width modulation(PWM) buck with P-AVS is divided into coarse scaling loop and fine scaling loop, which can regulate the reference voltage adaptively according to load *** coarse scaling loop can set quickly a coarse value of reference voltage according to the operation frequency of the load by a preset block, and the fine scaling loop is designed to scale voltage finely. The proposed P-AVS buck converter, with 3.3 V input and 2 MHz switching frequency,is fabricated in a 0.13μm standard CMOS process. The output voltage and the frequency of the load are designed from 0.7 V to 1.5 V and 30 MHz to 120 MHz *** with a typical AVS buck, the proposed P-AVS converter can save 17μs scaling up from 0.7 V to 1.1 V.

关键词： Adaptive voltage scaling(AVS) P-AVS Coarse scaling loop Fine scaling loop PWM regulator Fast response

Flotation evaluation and adsorption mechanism of medialan collector to wolframite

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Rare Metals 2013年第6期32卷 636-641页

作者： Xian-ping luo Li-Ying luo Li Gao Xue-Kun Tang College of Resource and Environmental Engineering Jiangxi University of Science and Technology

Medialan has preferable flotation performance to wolframite,under the conditions of the best flotation pH value 7.0 and low dosage,wolframite recovery is up to80%.Medialan shows poor flotation performance to quartz,but better to fluorite and ***,fluorite and calcite are inhibited in a certain degree by adding medialan mixed with sodium *** mechanism of medialan collector on wolfram surface was also studied by using infrared(IR)radiation spectrum,adsorption volume,and zeta *** results show that medialan can adsorb on wolfram surface in the form of chemistry adsorption,and as medialan collector dosage changes,change law of adsorption volume is similar with that of wolfram pure mineral *** potential results prove that zeta potential of wolfram surface moves negatively after adsorbing medialan collector.

关键词： Medialan Wolframite Flotation performance IR spectrum measurement Adsorbance Zeta potential

A Learning Particle Swarm Optimization Algorithm for Odor Source Localization

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International Journal of Automation and computing 2011年第3期8卷 371-380页

作者： Qiang Lu ping luo School of Automation Hangzhou Dianzi University Hangzhou 310018 PRC

This paper is concerned with the problem of odor source localization using multi-robot system. A learning particle swarm optimization algorithm, which can coordinate a multi-robot system to locate the odor source, is proposed. First, in order to develop the proposed algorithm, a source probability map for a robot is built and updated by using concentration magnitude information, wind information, and swarm information. Based on the source probability map, the new position of the robot can be generated. Second, a distributed coordination architecture, by which the proposed algorithm can run on the multi-robot system, is designed. Specifically, the proposed algorithm is used on the group level to generate a new position for the robot. A consensus algorithm is then adopted on the robot level in order to control the robot to move from the current position to the new position. Finally, the effectiveness of the proposed algorithm is illustrated for the odor source localization problem.

关键词： Multi-robot system odor source localization particle swarm optimization source probability map distributed coordination architecture.

Removing aluminum from a low-concentration lixivium of weathered crust elution-deposited rare earth ore with neutralizing hydrolysis

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Rare Metals 2017年第8期36卷 685-690页

作者： Xian-ping luo Li-ping Zou Pei-Long Ma Cai-Gui luo Jing Xu Xue-Kun Tang Faculty of Resource and Environmental Engineering JiangxiUniversity of Science and TechnologyGanzhou 341000China Jiangxi Key Laboratory of Mining and Metallurgy Environmental Pollution Control Gauzhou 341000China Key Laboratory of Southern Ionic-Type Rare Earth Resources Development and Application Ministry of EducationGanzhou 341000China Faculty of Engineering University of AlbertaEdmontonAB T6G2V4Canada

Aluminum,the main impurity in the lixivium of weathered crust elution deposited rare earth ore,not only results in an increasing consumption of precipitant in the rare earth precipitation process,but also lowers the purity of final rare earth *** in the weathered crust elution-deposited rare earth ore lixivium should be *** hydrolysis method was employed to remove aluminum from the *** was found to be the optimum pH regulator for the removal of aluminum in the low *** used to adjust the pH value of the lixivium to 5.0,aluminum in the lixivium can be effectively removed in the form of aluminum hydroxide precipitation with removal rate of 97.60%.It shows that hexamethylenetetramine has a good effect on the removing of aluminum ions from the lowconcentration ***,hexamethylenetetramine in removing aluminum from lixivium has little adverse effect on the RE precipitation process.

关键词： Weathered crust elution-deposited rare earth ore Lixivium, Aluminum removing Hexamethylenetetramine

Predicting compositional time series via autoregressive Dirichlet estimation

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Science China(Information Sciences) 2018年第9期61卷 300-305页

作者： Ganbin ZHOU ping luo Qing HE Key Lab of Intelligent Information Processing of Chinese Academy of Sciences Institute of Computing TechnologyChinese Academy of Sciences University of Chinese Academy of Sciences

In recent years,compositional time series(CTS)prediction has become a widely applied data analysis method for modeling tactile sequence data[1],hydrological time series data using a four-

关键词： CTS Predicting compositional time series via autoregressive Dirichlet estimation

Identification of miRNAs and their targets in tea (Camellia sinensis)

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2013年第10期14卷 916-923页

作者： Quan-wu ZHU Yao-ping luo Institute of Tea Science Zhejiang University

MicroRNAs(miRNAs) are endogenous small RNAs playing a crucial role in plant growth and development,as well as stress *** them,some are highly evolutionally conserved in the plant kingdom,this provide a powerful strategy for identifying miRNAs in a new ***(Camellia sinensis) is one of the most important commercial beverage crops in the world,but only a limited number of miRNAs have been *** the present study,a total of 14 new *** miRNAs were identified by expressed sequence tag(EST) analysis from 47 452 available *** *** miRNAs potentially target 51 mRNAs,which can act as transcription factors,and participate in stress response,transmembrane transport,and signal *** of gene ontology(GO),based on these targets,suggested that 37 biological processes were involved,such as oxidation-reduction process,stress response,and *** Encyclopedia of Genes and Genomes(KEGG) pathway enrichment analysis inferred that the identified miRNAs took part in 13 metabolic *** study will help further understanding of the essential roles of miRNAs in *** growth and development,and stress response.

关键词： MicroRNA(miRNA) Camellia sinensis Tea Gene ontology Pathway