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EFFECT OF SILICON ON PRODUCING DUCTILE IRON wITH COMPLEX STRUCTURE OF BAINITE AND MARTENSITE

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Acta Metallurgica Sinica(English Letters) 1998年第1期11卷 25-28页

作者： Y.P.Zhang J.X.zhu Y.q.wang J.Y.Su Xi'an Univ of Technology Xi'an China

This paper deals with an important role of silicon in producing ductile iron with quenched complex structure of bainite and martensite. The samples are cast in permanent mold and quenched in solution of sodium silicate. The result of thc experiments shows that the austenizing temperature should rise with increasing silicon content, otherwise much undissolved ferrite is present in the matrix after quenching. However the undissolvec ferrite can be decreased greatly or even eliminated by adding appropriate amount of ooron. On this condition, the amount of bainite gets increasing and the amount of residual austenite decreasing with the silicon cortent increasing. An approach has also been made to the mechanism of the effect of silicon on the transformation of bainite in ductile iron. The T.T.T. curves measured show that the increase of sllicon content causes the curve to shift to the left. This is quite different from the fact in steel.

关键词： ductile iron,silicon content bainite martensite

STUDY OF THE IDENTIFICATION OF ENTEROTOXIGENIC ESCHERICHIA COLI BY LT-DNA GENE HYBRIDIZATION

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中华医学杂志(英文版) 1991年第1期104卷 14-17页

作者： q Y zhu L q Li Y T Huang w M Lin Y T Li J wang Taiyuan Children's Hospital Shanxi.

Reference strains of enterotoxigenic Escherichia coil (ETEC), non-ETEC, and other enteropathogenic bacteria were used to prove the reliability of LT-DNA gene hybridization. In the test, LT-DNA gene hybridization was compared with plate immunohemolytic test (PIHT) in identifying LT-ETEC. The results obtained by both methods showed no significant differences. 791 strains of E. coil isolated from 1 875 children with acute diarrhea in Taiyuan Children’s Hospital were examined for LT-ETEC by LT-DNA gene hybridization and PIHT. 289 strains examined by LT-DNA gene hybridization were LT positive, while 205 strains examined by PIHT were LT positive. Three different assays were done: colony hybridization, PIHT and fecal direct blot hybridization on each of 74 fecal specimens from children with acute diarrhea. It was found that identification of LT-ETEC using fecal direct blot hybridization is a simple, sensitive and more practical method.

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High-resolution dipole ( e, e ) study for optical oscillator strengths of valence shell excitation of nitrogen

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Chinese Science Bulletin 1997年第17期42卷 1426-1429页

作者： Zhang, XJ Feng, RF Zhong, ZP Ji, q zhu, LF wu, SL Xu, KZ Department of Modern Physics University of Science and Technology of China Hefei China

NITROGEN is the most abundant element in the earth’s atmosphere. The study of optical oscillator strengths of nitrogen is of great significance in atmosphere physics, space physics and environment science. These results are also used in many fields, such as fusion plasma and developments of the nitrogen laser. As we know, calculation of absolute optical oscillator strengths of molecular nitrogen are still at the level of electronic rather than vibronic states resolved.

关键词： nitrogen optical oscillator strength high-resolution dipole (e e) method electron energy-loss spectrum.

PHOTOSwITCHABLE NANOFLUOROPHORES FOR INNOVATIVE BIOIMAGING

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Journal of Innovative Optical Health Sciences 2011年第4期4卷 395-408页

作者： MING-qIANG zhu GUO-FENG ZHANG CHONG LI YA-JING LI MATTHEw PALDRED ALEXANDER D.q.LI wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology wuhan 430074 China Department of Chemistry Washington State University PullmanWA 99164USA

Photosensitive fluorescent probes have become powerful tools in chemical biology and molecular biophysics,which are used to investigate cellular processes with high temporal and spatial ***,photosensitive fluorescent probes,including photoactivatable,photoconvertible,and photoswitchable fluorophores,have been extensively developed during the past *** photoswitchable fluorophores have received much attention because they highlight cellular events *** minireview summarizes recent advances of using reversibly photoswitchable fluorophores and their applications in innovative *** fluorophores include photoswitchable fluorescent proteins,photoswitchable fluorescent organic molecules(dyes),and photoswitchable fluorescent *** strategies have been developed to synthesize photoswitchable fluorophores,including engineering combination proteins,chemical synthesis,polymerization,and *** we concentrate on polymer nanoparticles with optically switchable emission properties:either fluorescence on/offor dualalternating-color fluorescence *** essential mechanisms of fluorescence photoswitching enable different types of photoswitchable fluorophores to change emission intensity or wavelength(color)and thus validating the basis of the fluorescence on/offor dual-color photoswitching *** the possible applications of any fluorophores are to label biological targets,followed by specific *** newly developed photoswitchable fluorophores enable super-resolution fluorescence imaging because of their photosensitive ***,we summarize the important area regarding future research and development on photoswitchable fluorescent nanoparticles.

关键词： Fluorescent molecular switches polymer nanoparticles two-photon two-photon imaging spiropyran

An Analytical Solution of Melting around a Moving Elliptical Heat Source

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Journal of Thermal Science 1994年第1期3卷 23-27页

作者： w.Z. Chen S.M. Cheng Z. Luo H.q. zhu(Huazhong University of Science and Technology,wuhan 430074, China) 1. Huazhong University of Science and Technology 430074 Wuhan China

This paper studies the close-contact melting around a moving, horizontal elliptical heat source thatmelts its way through a phase change material under its own weight. The heat source velocity andthe volume of the material melted are obtained by analysis. The effects of compression coefficient andtemperature distribution in the melt are investigated. The results include that for melting around amoving cylindrical heat source.

关键词： phase change close contact melting moving heat source analytical solution

TiS2-based saturable absorber for ultrafast fiber lasers

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Photonics Research 2018年第10期6卷 I0046-I0050页

作者： X. zhu S. CHEN M. ZHANG L. CHEN q. wu J. ZHAO q．JIANG Z．ZHENG H．ZHANG School of Electronic and Information Engineering Beihang University Beijing 100191 China Department of Optoelectronics Engineering Shenzhen University Shenzhen 518060 China College of Health Science and Environmental Engineering Shenzhen Technology University Shenzhen 518118 China College of Materials Science and Engineering Shenzhen University Shenzhen 518060 China

we fabricate titanium disulfide(TiS2) using a liquid exfoliation method and subsequently a TiS2-based device by optically depositing the TiS2 material onto the microfiber. This device exhibits a strong nonlinear saturable absorption property with an optical modulation depth of 8.3% at 1560 nm. with the implementation of this all-fiber TiS2-based saturable absorber, we demonstrate that both mode-locking and q-switching operation can be obtained in a turn-key all-fiber erbium-doped laser cavity. Our findings constitute the first example, to the best of our knowledge, of a TiS2-based saturable absorber for ultrashort pulse generation and highlight the great potential of such devices in two-dimensional nanomaterials-related photonics.

关键词：液体剥离方法激光器通讯技术发展现状

Numerical Simulation and Experiment Analyses for the Gas-liquid Two-phase Vortex Pump

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Journal of Thermal Science 2010年第1期19卷 47-50页

作者： Y.Li,Z.C.zhu,w.q.He,Y.P.wang and B.L.Cui The Lab of Multi-phase Fluid Transmission Technology,Zhejiang Sci-Tech University,Hangzhou 310018,China The Lab of Multi-phase Fluid Transmission Technology Zhejiang Sci-Tech University Hangzhou China

Based on the gas-liquid two-phase mixture transportation test, the k-c-A; turbulence model was applied to simulate the two-phase turbulent flow in a vortex pump. By comparing the simulation and experiment results, inner flow features were revealed. The bubbles in the channel distribute mainly at the pressure side of the blades, and the aggregation degree of the bubbles is enhanced with an increase in inlet gas volume fraction. Experimental results indicate that the influence of the gas phase on vortex pump performance is small when the gas volume fraction is less than 10%. when the gas volume fraction contiuuously increases to 15%, the characteristic curves abruptly drop due to the gas blocking phenomenon.

关键词： Vortex pump gas-liquid two-phase flow numerical simulation performance test

A CLASSICAL TRAJECTORY STUDY BASED ON MBE POTENTIAL ENERGY FUNCTIONS——REACTIVE COLLISIONS OF C+CH

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原子与分子物理学报 1990年第4期7卷 1693-1698页

作者： Z.H.zhu Y.M.Chen H.G.Yu Z.G.Xu q.q.Gou The Institute of Atomic and Molecular Physics Chengdu University of Science and Technology ChengduChina

Classical trajectories have been calculated for the reaction C+CH→C_(2)+H using many-body expansion(MBE)potential energy function of C_(2)*** present work gives the reactive cross sections at relative kinetic energy ... 详细信息

关键词： REACTIVE COLLISIONS OF C A CLASSICAL TRAJECTORY STUDY BASED ON MBE POTENTIAL ENERGY FUNCTIONS MBE CH

EFFECT OF LOw-FREqUENCY ELECTROMAGNETIC FIELD ON THE AS-CASTING MICROSTRUCTURES AND MECHANICAL PROPERTIES OF HDC 2024 ALUMINUM ALLOY

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Acta Metallurgica Sinica(English Letters) 2008年第3期21卷 205-210页

作者： q.F. zhu Z.H. Zhao J.Z. Cui Y.B. Zuo F. qu Key Laboratory of Electromagnetic Processing of Materials Ministry of Education Northeastern Univer- sity Shenyang 110004 China

The influences of the low frequency electromagnetic field on the horizontal direct chill casting process were investigated experimentally. Ingots of 2024 aluminum alloy with a cross size of 40 mm× 200 mm were produced by the conventional horizontal chill casting process and low frequency electromagnetic horizontal chill casting processre- spectively. The as-cast structures and the mechanical property of the ingots were examined. The results showed that the low frequency electromagnetic field could sub- stantially refine the microstructures and pronouncedly reduce the macrosegregation in the horizontal direct chill casting process. Moreover, the surface quality of the ingot was prominently improved by the low frequency electromagnetic field. The fracture strength and elongation percentage of the ingot was increased with the low frequency electromagnetic field.

关键词： Horizontal direct chill casting Low frequency electromagnetic field 2024 aluminum alloy Microstructures Macrosegregation