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Production of High Carbon Ferrochromium Using Melt Circulation

International Journal of Minerals,Metallurgy and Materials 1998年第4期12卷 192-202页

作者： Yulong Ding A J Merchant( Department of chemical engineering and chemical Technology, Impenal college of Science, Technology and Medicine, Prince Consort RoadLondon SW7 2BY, UK)( School of chemical engineering of the university of Birmingham, Edgbaston, Department of chemical engineering and chemical Technology Imperial College of Science Technology and Medicine Prince Consort Road London SW7 2BY United Kingdom School of chemical engineering University of Birmingham Edgbaston Birmingham B15 2TT United Kingdom

Some fundamental studies related to the production of high carbon ferrochromium were summarizedusing melt circulation technology carried out in the School of chemical engineering at the university of Birmingham. These studies focused on the kinetics of chromite reduction in Fe-C(-Cr-Si) melts. The effects of feed mode,fluxes, amount and particle size of reductant, particle size of chromite, melt composition and the reduction temperature were investigated. The reduction mechanisms were discussed. The results showed that (1 ) the reduction rates ofsintered chromite Pellets and non-compacted chromite powder in Fe-C(-Cr-Si) melts was generally very low,(2) addition of carbon in the non-compacted chromite feed greatly improved the reduction kinetics, (3) compaction of thecarbon-chromite mixtures into composite Pellets further improved the reduction kinetics and (4) addition of lime inthe composite Pellets increased the reduction rate, while the addition of silica may suppress the posihve effect oflime. It can be concluded that solid-state reduction, smelting reduction and dissolution proceed simultaneouslyduring the reduction of compacted compostite pellets or non-compacted composite mixtures in Fe-C(-Cr-Si) melts,and the early stage of reduction is very likely to be controlled by either or both solid-state and/or gas diffusionthrough the oxide phases and/or the product layers.

关键词： smelting reduction chromite reduction mechanisms ferrochromiumNomenclatures

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Sol-gel preparation and characterization of Li_(1.3)Al_(0.3)Ti_(1.7)(PO_4)_3 sintered with flux of LiBO_2

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Rare Metals 2010年第5期29卷 515-518页

作者： WU Xianming,LI Runxiu,CHEN Shang,HE Zeqiang,and MA Mingyou college of Chemistry and chemical engineering,Jishou university,Jishou 416000,China college of Chemistry and chemical engineering Jishou University Jishou China

Li1.3Al0.3Ti1.7（PO4）3 pellets sintered with different mole fractions of LiBO2 were prepared by sol-gel method. The structural identification, surface morphology, ionic conductivity, and activation energy of the pellets were studied by X-ray diffraction, scanning electron microscopy, and electrochemical impedance spectroscopy. The results show that all the Li1.3Al0.3Ti1.7（PO4）3 pellets sintered with different mole fractions of LiBO2 have similar X-ray diffraction patterns. The sintered pellet becomes denser and the boundary and comer of the particles become illegible with the increase of LiBO2. Among the Lil.3Al0.3Ti1.7（PO3）4 pellets sintered with different mole fractions of LiBO2, the one sintered with 1 mol% LiBO2 shows the highest ionic conductivity of 3.95×10^-4 ***^-1 and the lowest activation energy of 0.2469 eV.

关键词： phosphates sol-gel process sintering ionic conductivity electrochemical impedance spectroscopy

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Effect of surfactants on the structure and photoelectric properties of ITO films by sol-gel method

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Rare Metals 2010年第2期29卷 143-148页

作者： LIU Jiaxiang, WU Da, ZHANG Nan, and WANG Yue college of Materials Science and engineering, Beijing university of chemical Technology, Beijing 100029, China college of Materials Science and engineering Beijing University of Chemical Technology

The Indium tin oxide（ITO） thin film possesses excellent photoelectric properties that enable it to act as an ideal transparent *** obtain high-quality ITO films through sol-gel method, the ionic surfactant monoethanolamine and the non-ionic surfactant polyethylene glycol（PEG） were added to the ITO precursor *** influences of surfactants on the structural and photoelectric properties of ITO film samples were *** patterns indicated that surfactant monoethanolamine contributed to film predominant grain orientation along the（400） *** high transmittance（over 95%） was attributed to the preferred orientation and the grain size expansion of ITO *** showed that the surface particle size and the morphology of ITO films were strongly dependent on the kind of surfactants *** to the shortwave region, the absorption edge of the films exhibited the Burstein-Moss shift.

关键词： surfactants indium tin oxide films sol-gel structure photoelectricity

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Kinetics and Mechanism of the Polymerization of Methyl Methacrylate in a Y(acac)_3/n-BuMgCl System

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chemical Research in Chinese Universities 2000年第1期16卷 61-66页

作者： PAN Zhi-da SUN Jun-quan and YANG Shi-lin (college of chemical engineering, Zhejiang university, Hangzhou 310027, China) Zhejiang Univ Coll Chem Engn Hangzhou 310027 Peoples R China

Based on the kinetics equation proposed by T. Kagiya, the kinetic study on the polymerization of methyl methacrylate(MMA) by Y(acac)_3/n-BuMgCl was carried out with a dilatometer. It was found that the rate of propagation is the first order with respect to the concentration of both active center and monomer. Thus, the equation of propagation rate can be described as R_p=K_p[c][M]. In addition, the instantaneous chain initiation and single molecular termination were concluded for the present system. The activation energy is close to 32 kJ/mol. In the polymerization, n-BuMgCl acts not only as the cocatalyst, but also as chain transfer agent with c_I=3. 6 × 10^(-4).

关键词： Polymerization Kinetics Mechanism Methyl methacrylate Rare earth catalyst

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GENETIC DIVERSITY OF SOME BRYOPHYTES IN NORTHEAST CHINA

GENETIC DIVERSITY OF SOME BRYOPHYTES IN NORTHEAST CHINA

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中国苔鲜植物学奠基人陈邦杰先生百年诞辰国际学术研讨会

作者： Wei Sha Jing Li (Department of Biology college of Life Science and engineering qiqihar university qiqihar 161006)

＜正＞This is a study on the genetic diversity of some large bryophytes in northeast China. These aspects which were the handle of 20 species of bryophyte material, the genomic DNA extracts, the establish of the RAPD ... 详细信息

关键词： Bryophytes Genetic diversity Molecular systematics

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Nonlinear Behavior and Domain Feature at Oil/Water Interface

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Chinese chemical Letters 2003年第10期14卷 1062-1065页

作者： Jin Zhang GAO, Kan Jun SUN, Wu YANGChemistry and chemical engineering college, Northwest Normal university, Lanzhou 730070 Chemistry and chemical engineering college Northwest Normal University Lanzhou 730070

Studies on nonlinear behavior at oil/water interface membrane were performed. This system showed rhythmic oscillations and chaos of electrical potential in a given concentration domain. The nonlinear behavior response at the liquid membrane apparently resembled that of biological chemoreceptive membrane. The possibility of developing a new type of chemical sensor with the ability to simulate substance equilibrium in living organisms was suggested in the paper.

关键词： Nonlinear behavior oscillations oil/water interface domain.

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STUDY OF GENETIC DIVERSITY IN TWO SPECIES OF GRIMMIACEAE

STUDY OF GENETIC DIVERSITY IN TWO SPECIES OF GRIMMIACEAE

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中国苔鲜植物学奠基人陈邦杰先生百年诞辰国际学术研讨会

作者： Wei Sha Han Zhang (Department of Biology college of Life Science and engineering. qiqihar university qiqihar 161006)

＜正＞Sixty individuals of six populations of Grimmiaceae were analyzed by random amplified polymorphic DNA （RAPD） markers, to determine the genetic variations among and within populations. A total of 52 loci were a... 详细信息

关键词： Grimmiaceae RAPD Genetic diversity

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A novel four-component reaction involving ring-opening/recyclization of 1,3-thiazolidinedione

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Science China Chemistry 2010年第4期53卷 863-868页

作者： SUN Jing, XIA ErYan, ZHANG LiLi & YAN ChaoGuo college of Chemistry & chemical engineering, Yangzhou university, Yangzhou 225002, China 1. college of Chemistry & chemical engineering Yangzhou University Yangzhou 225002 China

The multicomponent reactions of 1,3-thiazolidinedione, malononitrile, aromatic aldehydes and α-phenylethylamine or β-phenylethylamine in acetonitrile at room temperature produce dihydrothiophene ureidoformamide derivatives in moderate yields through a domino ring-opening/recyclization reaction of 1,3-thiazolidinedione. On treatment with DDQ, dihydrothiophenes are dehydrogenated to convert efficiently to thiophenes in the mild condition.

关键词： multicomponent reaction ring-opening recyclization dihydrothiophene thiazolidinedione

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Preparation of Exo-tetrahydrodicyclopentadiene Using SiW/Hβ Catalyst

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China Petroleum Processing & Petrochemical Technology 2011年第3期13卷 41-46页

作者： Kang Zhuozhuo Wu Wenliang Zhou Zhiwei (college of Chemistry and chemical engineering,Nanjing university of Technology,Nanjing 210009) Nanjing Univ Technol Coll Chem & Chem Engn Nanjing 210009 Peoples R China

Exo-tetrahydrodicyclopentadiene （exo-TCD） is an important high-energy fuel. Silicotungstic acid （SiW） immobilized on H-type β zeolite （Hβ） at room temperature were used to prepare the Hβ zeolite catalysts with different SiW contents. Catalytic performances of the catalysts were investigated during the preparation of exo-TCD via isomerization of endo-tetrahydrodicyclopentadiene （endo-TCD）. The properties of catalysts were characterized by XRD, temperature pro- grammed desorption of ammonia （NHa-TPD）, FT-IR, and N2-adsorption techniques. SiW was highly dispersed on the surface of Hβ zeolite, and the 10% SiW/Hβ zeolite catalyst had the highest amount of weak acidity among all SiW/Hβ zeolite catalysts. The influence of different factors on isomerization reaction was investigated. At a reaction temperature of 240 ℃, a n（cyclohexane） / n（endo-TCD） ratio of 10, a m（catalyst）/m（endo-TCD） ratio of 0.3, an initial pressure of 1.0 MPa, and a reaction time of 1.5 h in the presence of 10% SiW/Hβ catalyst calcined at 400 ℃, the conversion of endo-TCD reached up to 92.0%, with the yield of exo-TCD equating to 51.0%.

关键词： exo-tetrahydrodicyclopentadiene endo-tetrahydrodicyclopentadiene Hβ zeolite silicotungstic acid (SiW)

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The Research of the Realization Method of the Synchronous Technology in CDMA

The Research of the Realization Method of the Synchronous Te...

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2012 International Conference on Electrical and Computer engineering(ICECE2012)

作者： Hengjun Zhu Hongbo Yu and Hui Li Communication and Electronic engineering college university of qiqihar qiqihar Heilongjiang Province China

This paper analysed the Synchronous technology,gave a design method in CDMA system,and proposed a design scheme based on CPLD technology synchronization *** Ⅱ environment,Use MAX7000 devices,Use hardware description language,the complex programmable logic device etc to complete system *** results show that System realizes the transceiver synchronous,no distortion *** system has certain significance to the teaching and scientific research,with low cost,simple development etc.

关键词： Synchronous technology CDMA MAX7000 devices Hardware description language The complex programmable logic device

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