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STUDY OF AXIAL VELOCITY IN GAS CYCLONES BY 2D-pIV,3D-pIV,AND SIMULATION

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particuology 2006年第Z1期 204-210页

作者： Zhengliang Liu, Jinyu Jiao and Ying Zheng* department of Chemical engineering, University of New Brunswick, 15 Dineen Drive, p.O. Box 4400, Fredericton, NB, Canada E3B 5A3, Canada

The axial velocity distribution in a gas cyclone has been examined with two-dimensional particle image velocimetry (2D-pIV) and three-dimensional particle image velocimetry (3D-pIV) experiments in this study. Due to the limitation of 2D-pIV configuration, the contamination generated by the strong tangential velocity in the cyclone can be registered in the axial velocity detected by 2D-pIV. Efficient methods are proposed in this work to remove this contami- nation. The contamination-removed 2D-pIV data agree well with 3D-pIV results. The distributions of the axial velocity are also computed by the reynolds stress model (rSM) and verified using the pIV experimental results. reasonable agreements are obtained.

关键词： particle image velocimetry (pIV) numerical simulation axial velocity cyclone separators

Model of Current Threshold for perception in Testing Electrical Safety performance

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Transactions of Tianjin University 2010年第1期16卷 11-16页

作者：王晓飞张朝晖李东刘国忠赵旭 School of Information engineering University of Science and Technology Beijing School of Electro-Optical engineering Beijing Information Science and Technology University department of Neurology The 306th Hospital of PLA

A generalized mathematical model of human body current threshold for perception was established and the current flowing through human body could be arbitrary cyclical *** relationship between human body current threshold for perception and current frequency, true root mean square(rMS) value and influence factor was described.A test system was established based on electroencephalogram(EEG) to study the relationship between human body current threshold for perception and current waveform, frequency ...

关键词： electrical safety performance leakage current current threshold for perception current waveform electroencephalogram(EEG)

Variable Structure Control Method for Discrete-Time System

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Variable Structure Control Method for Discrete-Time System

CHEMOENZYMATIC SYNTHESIS OF BIODEGrADABLE pOLY(1’-O-VINYLADIpOYL-SUCrOSE)

第二十七届中国控制会议

作者： Li Zhongjuan,Zhang Xinzheng department of Automation,Guangdong University of Technology,Guangzhou 510090,p.r.china

The design of variable structure control（VSC） of uncertain discrete time systems using discrete exponential reaching law is *** reason for the discrete reaching law to cause system chattering is given and an improved discrete reaching law is developed.A grey estimating model is built for the uncertain part and thus values of parameters are obtained. Simulation results are presented to illustrate that the method presented in the paper is feasible and asymptotic stability of the system is ensured.

关键词： Discrete variable structure control reaching law Uncertain systems

来源： cnki会议评论

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cnki会议

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Chinese Journal of polymer Science 2002年第6期20卷 579-584页

作者： De-shui Lu Qi Wu Xian-fu Lin department of Chemistry Zhejiang University Hangzhou 310027, china department of Chemistry Zhejiang University Hangzhou 310027

A novel polymer containing the sucrose group was synthesized by radical polymerization from an enzymatically prepared monomer, 1'-O-vinyladipoyl-sucrose (VAS). Transesterification reaction of sucrose with divinyl adipate in anhydrous pyridine catalyzed by an alkaline protease from Bacillus subtilis at 60degreesC for 7 days gave VAS (yield 55%) without any blocking/deblocking steps. The vinyl sucrose ester could be polymerized with potassium persulfate and H2O2 as initiator to give poly(1'-O-vinyladipoyl-sucrose) with M-n = 33,000 and M-w = 53,200, M-w/M-n = 1.61. The polymer was biodegradable. After 6 days in aqueous buffer (pH 7), this alkaline protease could degrade poly(1'-O-vinyladipoyl-sucrose) to M. of ca. 1080, M-w/M-n = 3.30 (37degreesC), and M-n of ca. 5200, M-w/M-n = 2.44 (4degreesC). The polymer containing the sucrose branch would be a functional material in various application fields.

关键词： divinyladipate sucrose alkaline protease polymerization biodegradation

Experiments and reaction characteristics of liquid phase simultaneous removal of SO_2 and NO

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Science china(Technological Sciences) 2009年第6期52卷 1768-1775页

作者： ZHAO Yi,LIU Feng,GUO TianXiang & ZHAO Yin School of Environmental Science and engineering,North china Electric power University,Baoding 071003,china School of Environmental Science and engineering North China Electric Power University Baoding China

Experiments of simultaneous removal of SO2 and NO from simulated flue gas,using NaClO2 solution as the absorbent,were carried out in a self-designed bubble reactor,and high simultaneous removal effi-ciencies of SO2 and NO were obtained under the optimal experimental *** mechanism of simultaneous removal based on NaClO2 acid solutions was proposed by analyzing the removal *** and limitation of the desulfurization and denitrification using NaClO2 acid solutions were calculated by thermodynamic *** results of reaction kinetics for simultaneous desulfurization and denitrification indicated that the oxidation-absorption processes of SO2 and NO were divided into two zones,namely the fast and slow reaction *** the slow reaction zones both were zero order reactions,and in the fast reaction zones,the reaction order,rate constant and activa-tion energy of SO2 reaction with absorbent were 1.4,1.22(mol.L-1)-0.4.s-1 and ***-1,respec-tively,and 2,3.15×103(mol.L-1)-1.s-1,and 42.50 ***-1 for NO reaction,respectively.

关键词： sodium chlorite simultaneous removal of SO2 and NO kinetics experiments

Cilia and ciliopathies:From Chlamydomonas and beyond

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Science china(Life Sciences) 2008年第6期51卷 479-486页

作者： pAN JunMin department of Biological Sciences and Biotechnology, Tsinghua University, Beijing 100084, china department of Biological Sciences and Biotechnology Tsinghua University Beijing China

The biological function of motile cilia/flagella has long been recognized. The non-motile primary cilium, once regarded as a vestigial organelle, however, has been found recently to play unexpected roles in mammalian physiology and development. Defects in cilia have profound impact on human health. Diseases related to cilia, collectively called ciliopathies include male infertility, primary cilia dyskinesia, renal cyst formation, blindness, polydactyly, obesity, hypertension, and even mental retardation. Our current understanding of cilia and ciliopathies has been fueled by basic research employing various model organisms including Chlamydomonas, a unicellular green alga. This review article provides a general introduction to the cell biology of cilia and an overview of various cilia-related diseases.

关键词： Chlamydomonas cilia flagellla human disease ciliopathy

Selective removal of 2,4-dichlorophenoxyacetic acid from water by molecularly-imprinted amino-functionalized silica gel sorbent

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Journal of Environmental Sciences 2010年第2期22卷 237-241页

作者： Deman Han ,Wenping Jia,Huading Liang department of Chemistry,Taizhou University,Linhai 317000,china. department of Chemistry Taizhou University Linhai 317000 China

A molecularly-imprinted amino-functionalized sorbent for selective removal of 2,4-dichlorophenoxyacetic acid （2,4-D） was prepared by a surface imprinting technique in combination with a sol-gel process. The 2,4-D-imprinted amino-functionalized silica sorbent was characterized by FT-Ir, nitrogen adsorption and static adsorption experiments. The selectivity of the sorbent was investigated by a batch competitive binding experiment using an aqueous 2,4-D and 2,4-dichlorophenol （2,4-DCp） mixture or using an aqueous 2,4-D and 2,4- dichlorophenylacetic acid （DpAC） mixture. The largest selectivity coefficient for 2,4-D in the presence of 2,4-DCp was found to be over 18, the largest relative selectivity coefficient between 2,4-D and 2,4-DCp over 9. The static uptake capacity and selectivity coefficient of the 2,4-D-imprinted functionalized sorbent are higher than those of the non-imprinted sorbent. The imprinted functionalized silica gel sorbent offered a fast kinetics for the extraction/stripping of 2,4-D, 73% of binding capacity （200 mg/L 2,4-D onto 20 mg of imprinted sorbent） was obtained within 5 min and the adsorbed 2,4-D can be easily stripped by the mixture solution of ethanol and 6 mol/L HC1 （V：V =1：1）. In a test of five extraction/stripping cycles, the adsorption capacity of the sorbent was all above 93% of that of the fresh sorbent. Experimental result showed the potential of molecularly-imprinted amino-functionalized sorbent for selective removal of 2,4-D.

关键词： 2,4-dichlorophenoxyacetic acid molecular imprinting functionalized silica gel

Numerical simulation analysis of covering rock strata as mining steep-inclined coal seam under fault movement

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中国有色金属学会会刊：英文版 2011年第S3期21卷 556-561页

作者： MA Feng-hai, SUN Li, LI Dun College of Civil and Architectural engineering, Dalian University, Dalian 116622, china College of Civil and Architectural engineering Dalian University Dalian 116622 China

The fault is one important factor for the stability of overburden strata caused by steeply inclined coal seam. The stress and displacement change of overburden strata caused by steeply-inclined coal seam mining activity under faulting was simulated by FLAC2D finite differential program on the basis of Zhaogezhuang mining example belonging to Kailuan Mining Group. From the results, the stress and displacement clouding image after mining became complex because of the fault, that is, a kind of weak structural plane. The stress concentration region concentrated around the goaf, and also around the fault plane. As the mining depth increases, the stress and displacement within the fault zone change significantly. This movement and deformation characteristic of overburden strata can provide theoretical basis for the similar mining condition.

关键词： fault steep-inclined coal seam numerical simulation overburden distortion

TrEATMENT OF BUrNS USE COMpOUND BAIJI pASTE

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TREATMENT OF BURNS USE COMPOUND BAIJI PASTE