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Magnet Demagnetization Observation for Permanent Magnet Synchronous Motor

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Magnet Demagnetization Observation for Permanent Magnet Sync...

Baculovirus as a highly efficient expression vector in insect and mammalian cells

第11届国际电机与系统学术会议

作者： Xiao Xi Chen Changming Zhang Meng The department of Electrical engineering Tsinghua university Beijing 100084 China The department of Electrical engineering Tsinghua University Beijing 100084 China

ISBN: (纸本)9787506292214

＜正＞Accurate information of rotor permanent magnet field is needed in permanent magnet synchronous motor（PMSM） control,but this information is variable under demagnetization conditions,such as high temperature or peak current Nonsinusoidal flux density distribution caused by demagnetization induces to torque ripple,which degrades the PMSM drive *** estimate flux magnitude,a Kalman filter is built by using stator current and PM flux as state *** estimation method can accurately track the diversity of permanent flux and is robust to motors’ parameters. The flux linkage is represented by means of Fourier series expansion,and the observe method is used for the online detection demagnetization of *** evaluations of flux linkage are carried out on a DSP-controlled PMSM drive *** results obtained demonstrate the effect of the proposed method.

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Acta Pharmacologica Sinica 2005年第4期26卷 405-416页

作者： Yu-chen HU~1 department of Chemical engineering,National Tsing Hua university,Hsinchu,Taiwan,China department of Chemical engineering National Tsing Hua University Hsinchu Taiwan China

Baculovirus has been widely used for the production of recombinant proteins ininsect *** the finding that baculovirus can efficiently transduce mamma-lian cells,the applications of baculovirus have been greatly *** pros-pects and drawbacks of baculovirus-mediated gene expression,either in insect orin mammalian cells,are *** progresses in expanding the applicationsto studies of gene regulation,viral vector preparation,in vivo and ex vivo genetherapy studies,generation of vaccine vectors,etc are discussed and the effortsdirected towards overcoming the existing bottlenecks are particularly emphasized.

关键词： baculovirus insect cell mammalian cell gene therapy vaccine recombinant protein

PROCESSINGTECHNIQUESANDCHARACTERIZATIONOFCERAMICFIBERREINFORCEDALUMINIUMCOMPOSITES

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Transactions of Nanjing university of Aeronautics and Astronautics 1996年第1期13卷 9-14页

作者： Won Jong Choi Lu Ho Choi department of Materials engineering,Hankuk Aviation universityKoyang,Kyunggi do,korea

This paper relates to the fabrication of aluminium matrix composites with various amounts of Al 2O 3 fiber and SiC whiskers by rheocasting, powder metallurgy process and liquid metal infiltration process. To analyze wetting characteristics, the cross sections of composites are examined by scanning electron microscopy(SEM). The bending tests and microhardness tests are performed to evaluate mechanical properties of composites. The results show that the composites produced by liquid metal infiltration give better properties than those produced by rheocasting or powder metallurgy process, primarily due to the decrease of porosity and reinforcement cluster. For liquid metal infiltration composites, a good adhesion between the fiber and matrix is found. Three points bending test results show that there is an increase in flexural modulus with reinforcement contents. In addition, a series of microhardness tests are conducted to determine the effect of heat treatment on the mechanical property of Al 2O 3/Al composites.

关键词： composite materials metal matrix composites reinforced metal composite processing techniques

A STUDY ON ALUMINIDE COATINGS ON TiAl ALLOYS BY PACKCEMENTATION METHOD

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Acta Metallurgica Sinica(English Letters) 2000年第6期13卷 1148-1154页

作者： C.G. Zhou, H.B. Xu and S.K. Gong (department of Materials Science and engineering, Beijing university of Aeronautics and Astronautics,Beijing 100083, China) K. Y. Kim (department of Materials Science and engineering, Pohang university of Science and Techn

The halide-activated pack cementation method is utilized to deposit aluminide coat- ings on TiAl alloys. Emphasis is placed on the effect of alloying elements on the aluminizing behavior of TiAl alloy. The addition of a small amount of Nb or Cr in the TiAl improves significantly the aluminizing kinetics of TiAl alloys by increasing the solid-state division of Al through the formation of stable TiAl3 layer. The TiAl3 layer formed on the TiAl alloyed with Nb or Cr has better toughness than the TiAl3 formed on the non-alloyed TiAl. The reason for better toughness of the coating formed on TiAl is that partial TiAl3 with tetragonal structure was changed to high symmetry cubic L12 structure since Nb or Cr was dissolved into TiAl3. The TiAl3 layer formed on the TiAl alloyed with Nb or Cr has much better oxidation resistance than the TiAl3 layer formed on the non-alloyed TiAl. It is attributed to change in the crystal structure of TiAl3 from the brittle tetragonal DO22 to the ductile cubic L12 by addition of small amount of Nb or Cr.

关键词： TiAl alloying element pack cementation aluminizing

Evaluation of KH2PO4 as a Risk Reducer for Contaminated Firing Ranges

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Rapid Sintering of Alumina in Low Pressure RF Plasma

2012年环境污染与大众健康学术会议

作者： Jae-Woong Jung, SangsoonIm, Gwanghun Lee, Kyoungphile Nam department of Civil and Environmental engineering, Seoul National university, Seoul, Republic of korea

Groundwater contamination by explosives and heavy metals at some firing ranges are an emerging environmental issue in *** study results revealed that KH 2 PO 4 application can reduce the risk by 2,4,6- trinitrotoluene （TNT） contaminated groundwater *** risk by groundwater ingestion in the absence of KH 2 PO 4 was 7.6 x 10 -4 ,whilethe risk was reduced down to 1.66 x 10 -5 in the presence of KH 2 PO 4 . The effect of KH 2 PO 4 on risk imposed by heavy metal-contaminated groundwater ingestion was not quantified at this time.

关键词： Explosives heavy metal monopotassium phosphate risk assessment

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International Journal of Minerals,Metallurgy and Materials 1999年第2期13卷 133-135页

作者： Wenxia Pan Fanxiu Lu Toyonobu Yoshida (InstitUte of Mechanics, Chinese Academy of Sciences, Beijing 100080, China) (Material Science and engineering School, university of Science and Technology Beliing, Beliing 100083, China) (department of Metallurgy, Institute of Mechanics Chinese Academy of Sciences Beijing 100080 China Material Science and engineering School University of Science and Technology Beijing Beijing 100083 China department of Metallurgy University of Tokyo Tokyo 113 Japan

Three kinds of high-purity A12O3 powders, whose average paticle size is 0. l, 0.3 and 3.0 mp respectively, were used as thestarting power, and their compacts were fired in the radio-frequency plasma generated at a pressure of 80 Pa using N, as the working *** results show that the 0. 1 and 0.3 mp powder compacts can be sintered to nearly the theoretical density within 60 s and thissintering is almost finished in the heating period. It is concluded that the mechanism of liquid sintering, the electric charge effect of Al2O3powder, and the effect of tempetrature gradient in the compacts can affect simultaneously on the rapid densification of the compacts inthe plasma sintering.

关键词： plasma sintering alumina rapid heating

Thermal Flexure Measurement and Inverse Characterization for a Tri-layer Thin Plate

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实验力学 2011年第5期26卷 540-555页

作者： Alireza Shirazi Ahmad Varvani-Farahani department of Mechanical and Industrial engineering Ryerson University

The paper presents a new study on a tri-layer thin *** moiré implemented with an advanced phase unwrapping technique is employed to obtain actual flexural deformation of a real-life plate sample subjected to thermal *** analytical model is re-formulated to provide the plate with global closed-form solutions of the plate deflection as well as the interfacial stress and *** the measurements and the solutions available,an inverse iterative approach is developed to evaluate and maximize the correlation between the measured and the predicted thermal flexure,leading to ascertained materials' constitutive and thermal *** inverse search algorithm starts with estimated ranges of material property parameters and progressively updates them to finally approach the respective true *** established model solutions along with the optimized material properties matrix enable an accurate evaluation of the interfacial stresses/strains for the specific plate sample.

关键词：英文摘要内容介绍编辑工作期刊

Using Genetic Algorithms and Monte Carlo to Price Convertible Bond

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Using Genetic Algorithms and Monte Carlo to Price Convertibl...

Onsetof Emerging Market Crises with Probit Model

2010 2nd IEEE International Conference on Information and financial engineering(ICIFE2010)

作者： Lin Li 1st School of Business East China university of Science and Technology Shanghai China 200237 Lele Wang 2nd financial engineering department Institute of Shanghai Securities Co. Ltd Shanghai China 200001

the aim of paper is to use Genetic algorithm and Monte Carlo to price convertible bond with finite maturity. As we known, Monte Carlo is hardly applied to price the derivatives with optimal items. Combined with Genetic algorithm and Cubic sample function, Monte Carlo not only solves the convertible bond with optimal conversion items, but also prices that with long-range dependence property. By evaluating the controlling points of cubic sample function, the optimal convertible boundary is showed. Furthermore, the proposed method can be applied to price derivatives with optimal items, such as American option and optimal investment with muti-risky assets.

关键词： component Genetic Algorithm Monte Carlo convertible bond Conversion item.

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Journal of Systems Science and Systems engineering 2001年第1期13卷 20-33页

作者： JIANG De peng 1,2 , SHENG Zhao han 1,2 , Moon Whoan Rhee3 1.School of Economic and Management, Southeast university, Nanjing 210096, China 2.Institute of Management Science and engineering, Nanjing university, Nanjing 210008, China 3.Departme School of Economic and Management Southeast University Nanjing 210096 China Institute of Management Science and engineering Nanjing University Nanjing 210008 China department of Finance Towson University MD21252 USA

：This paper examines the relative strength of factors in predicting the onset of a financial crisis inthe emerging market during the 1990s. We estimate a probit model based on the quarterly data of 18countries. The results suggest that the mis-management in the economy and banking system, the shifts inthe international conditions and the depth of contagion effects are strongly associated with the presence ofcrises. Some of the results are somewhat different from the other empirical studies based on annual data. Acareful analysis of the probability distributions showed that the results were close to being correct in over90% of the cases.

关键词： emerging markets probit model contagion effects