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θ-PSO: a new strategy of particle swarm optimization

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Journal of Zhejiang University-science A(Applied Physics & Engineering) 2008年第6期9卷 786-790页

作者： Wei-min ZHONG1,2, Shao-jun LI1,2, Feng QIAN1,2 (1State Key Laboratory of Chemical Engineering, east China University of science and technology, Shanghai 200237, China) (2Automation institute, east China University of science and technology, Shanghai 200237, China) State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai China Automation institute East China University of Science and Technology Shanghai China

Particle swarm optimization (PSO) is an efficient, robust and simple optimization algorithm. Most studies are mainly concentrated on better understanding of the standard PSO control parameters, such as acceleration coefficients, etc. In this paper, a more simple strategy of PSO algorithm called θ-PSO is proposed. In θ-PSO, an increment of phase angle vector replaces the increment of velocity vector and the positions are decided by the mapping of phase angles. Benchmark testing of nonlinear func- tions is described and the results show that the performance of θ-PSO is much more effective than that of the standard PSO.

关键词： Particle swarm optimization (PSO) Phase angle Benchmark function

SUPERCONVERGENCES OF THE ADINI'S ELEMENT FORSECOND ORDER EQUATION

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Journal of Computational Mathematics 1999年第6期17卷 569-574页

作者： Ping Luo(Department of Computer science and technology, Qinghua University, Beijing 100084,China)Qun Lin(institute of Systems science, Academia Sinica, Beijing, 100080, China) 清华大学计算机系北京 100084 中科院系统科学所北京 100080

n this papers the asymptotic error expansions of Adini's element for the secondorder imhomogeneous Neumann problem are given and the superconvergence estimations are obtained. Moreover, a numerical example to support ... 详细信息

关键词： Adini's element Superconvergence estimation Asymptotic expansion.

SIZE DISTRIBUTION AND BEHAVIOUR OF VC PARTICLES IN FERRITIC NODULAR CAST IRON

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Acta Metallurgica Sinica(English Letters) 1993年第8期6卷 92-97页

作者： WANG Yu SONG Weixi HAN Qiyong University of science and technology Beijing,Beijing,China The institute of Precise and Special New Materials, University of science and technology Beijing,Beijing 100083,China Beijing Univ of science and Technology Beijing China

Size distribution and precipitation of VC particles in ferritic nodular cast iron have been examined by techniques of ultrasonic screening,small angle X-ray scattering and chemical *** VC particles are sized over a wide *** superfine ones, dispersed in the ferritic matrix,are the majority.A saturated dispersion with ultrafine VC particles may be approached as the V content increasing in the ***5 seems to play an important role in the precipitation strengthening for ferritic nodular cast iron.

关键词： nodular cast iron ferrite size distribution VC particle

Laboratory Investigation of Zinc Recovery fromEAF Dust by Bath Smelting Reduction

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International Journal of Minerals,Metallurgy and Materials 2000年第1期14卷 18-23页

作者： Weiqing Chen Tarek El Gammal Metallurgy School, University of science & technology Beijing, Beijing 100083, China institute for Ferrous Metallurgy, Aachen University of technology, Germany Metallurgy School University of Science and Technology Beijing Beijing 100083 China institute for Ferrous Metallurgy Aachen University of Technology Germany

Bath smelting reduction for recovering zinc from EAF (Electric Arc Furnace) dust has been investigated in the laboratory. A degree of zinc volatilization of more than 99% was obtained from the process. Temperature has a clear influence on the reduction rate of ZnO in slag. The reduction rate of (ZnO) by [C] is the first order with respect to the content of ZnO in the slag. The apparent activation energy of the (ZnO) reduction reaction is 312 kJ/mol at 1300-1500℃.

关键词： EAF dust ZnO smelting reduction reduction rate

林克明旧居修缮与活化利用,广州,广东,中国

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世界建筑 2024年第8期 64-69页

作者： Guangdong Architectural Design and Research institute Group Co.,Ltd. Architectural Design and Research institute of South China University of technology 广东省建筑设计研究院集团股份有限公司华南理工大学建筑设计研究院有限公司

街区断点更新林克明旧居(简称旧居)1935年由中国第一代著名建筑师林克明设计建造。旧居所在的越秀北路原为民国初年广州城墙拆除后的城基路,城外即东濠涌,前后高差达8m。林克明巧妙地利用地形组织功能与空间,并采用摩登建筑理念,使建筑... 详细信息

街区断点更新林克明旧居(简称旧居)1935年由中国第一代著名建筑师林克明设计建造。旧居所在的越秀北路原为民国初年广州城墙拆除后的城基路,城外即东濠涌,前后高差达8m。林克明巧妙地利用地形组织功能与空间,并采用摩登建筑理念,使建筑形体呈现出迷人的风采。

关键词：建筑形体建筑理念活化利用功能与空间著名建筑师林克明修缮城墙

Power Beam and Modern Manufacturing

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稀有金属材料与工程 2011年第S4期40卷 14-20页

作者： Gong Shuili science and technology on Power Beam Processes Laboratory,Beijing Aeronautical Manufacturing technology Research institute (BAMTRI),Beijing 100024,China Beijing Aeronaut Mfg Technol Res Inst BAMTRI Sci & Technol Power Beam Proc Lab Beijing 100024 Peoples R China

The power beam processing,including the processing of laser beam,electron beam,ion beam and plasma beam,is one of the advanced modern manufacturing technology,which is extensively used in many fields in the modern *** is playing an important role for modern *** weld technique,surface engineering technique and rapid manufacturing technique processed by power beam at BAMTRI are *** new research progresses are given in this paper.

关键词： power beam weld technique surface engineering technique rapid manufacturing technique

Properties of nonadiabatic quantum fluctuations of the strongly coupled electron-phonon systems

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science China(Physics,Mechanics & Astronomy) 2008年第3期51卷 258-268页

作者： PANG XiaoFeng institute of Life science and technology,University of Electronic science and technology of China,Chengdu 610054,China International Centre for Materials Physics,Chinese Academy of sciences,Shenyang 110015,China institute of Life science and technology University of Electronic Science and Technology of China Chengdu China International Centre for Materials Physics Chinese Academy of Sciences Shenyang China

A new variational-ansatz of states of electrons and phonons was proposed on the basis of the Holstein model in strongly coupled electron-phonon systems for studying the influence of nonadiabatic phonon fluctuation,arising from the motion and density fluctuation of electrons,on the properties of ground state,uncertainty relation,stability of polarons,charge density wave (CDW) and phonon staggered ordering. The new ansatz represents the correlation among the displacement and squeezing states of phonons and polaron’s state of electrons as well as the squeezing-antisqueezing effect. The correlation and squeezing-antisqueezing ef-fect result in the decrease of ground state energy,enhancement of stability of the systems,increase of binding energy of the polarons,weakening of the growing speed of polaron narrowing of the electron band,increase of the charge density wave order and suppression of the increased tendency of anomalous quantum fluctuation of the phonons in such a case,when compared with the uncorrelated case in the systems. The results obtained show that the ground state determined by the new state ansatz is most stable,thus the new ansatz describing the properties of the coupled electron phonon systems is very relevant and available,especially in strongly coupled and largely squeezed cases.

关键词： squeezing-antisqueezing effect state-ansatz polaron coupled electron-phonon systems quantum fluctuation

Deformation Processed Cu-15 wt pct Cr Composite Synthesized by Hot Hydrostatic Extrusion of Mechanical Milled Powders

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Journal of Materials science & technology 2003年第5期19卷 507-508页

作者： Jinglei LIU, Zuyan LIU and Erde WANGSchool of Materials science and Engineering, Harbin institute of technology, Harbin 150001, China School of Materials science and Engineering Harbin Institute of Technology Harbin 150001 China

A novel technique was developed for the preparation of Cu-15 wt pct Cr composite with high strength and conductivity. The composite powders with refined microstructure and curly lamellae strengthening phase was first prepared by mechanical milling in favorite milling time and then were hot hydrostatic extruded after pre-densification with sintering or hot pressing. It was shown that the extrusion densified the composite powders well and at the same time the chaos curled strengthening phase was aligned into lines and further deformed as strengthening ribbons. The deformation processed Cu-15 wt pct Cr composite prepared by this technique is of superior conductivity, strength and thermal stability.

关键词： Mechanical milling Hydrostatic extrusion Deformation processed composite Copper-base composite

Surface Composition and Corrosion Property of TiNi Alloys Coated with Tantalum Films

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Journal of Materials science & technology 2004年第4期20卷 474-476页

作者： Yan CHENG, Wei CAI and Liancheng ZHAOSchool of Materials science and Engineering, Harbin institute of technology, Harbin 150001, China Sch. of Mat. Sci. and Eng. Harbin Inst. of Technol. Harbin 150001 China

Multi-arc ion plating method was employed to coat TiNi alloys with Ta in order to improve radiopacity and corrosion resistance property. The surface composition, corrosion resistance property and Ni ions release amount of TiNi alloys coated with Ta films compared with TiNi alloys, are investigated by means of X-ray photoelectron spectrometry (XPS), electrochemical measurements and atomic absorption spectrophotometry (AAS), respectively. The results show that the coated surface composition is composed of Ta and 0 and the corrosion resistance is improved, whereas the Ni ions release amount of the coated sample is lower than that of the uncoated samples in the whole immersion period, indicating that Ta coating can improve the biocompatibility of TiNi alloys.

关键词： TiNi alloy Tantalum Coating Corrosion