Modeling of Solid-state Polycondensation of Poly (ethylene terephthalate)

A mathematical model has been developed to handle the reactions in Poly(ethylene terephthalate) (PET) undergoing polycondensation reactions in the solid state. The effect of temperature on chain mobility was considered to estimate the rate constants of chemical reactions. The polymer crystalline fraction is modeled as containing only repeat units, thus concentrating end groups and conden-sates in the amorphous fraction. This model is compared with PET reaction data with good results.     

Electroluminescent property of tetrakis(phenyl)porphyrin carbonyl ruthenium(Ⅱ)

Luminescent tetrakis(phenyl)porphyrin carbonyl ruthenium (Ⅱ) (RuTPPCO) complex was employed as a doped emitting material to fabricate red organic electroluminescent (EL) devices. The EL device structure was [ITO/copper phthalocyanine (Cu-Pc) (15.0 nm)/N,N′-di(α-naphthyl)-N,N′-diphenyl-(1,1′-biphenyl)-4, 4′-diamine (NPB)(60.0 nm)/tris(8-hydroxyquinolinato)aluminum (Alq3):RuTPPCO (50.0 nm)/LiF (1.0 nm)/Al (200.0 nm)]. The codeposited films of Alq3:RuTPPCO were utilized as the emitting layer to construct EL devices. Experimental results showed that energy transfer from Alq3 to RuTPPCO occurred in the codeposited films. The EL property of the codeposited Alq3:RuTPPCO films with different RuTPPCO concentrations was described. For the EL device with the RuTPPCO concentration of 15% by weight, deep red electroluminescence at 656 nm with the maximum EL efficiency of 0.32 cd/A was achieved.     

Free-volume evolution of glassy Zr_(65)Al_(7.5)Ni_(10)Cu_(17.5) during inhomogeneous deformation

Free-volume evolutions of the as-cast and pre-annealed Zr65Al7.5Ni10Cu17.5 metallic glasses during cold-rolling were investigated using differential scanning calorimetry. As deformation degree increases, free volume in the glasses always increases first and then saturates above a critical strain, while the structure remains completely amorphous. The glass with less initial free volume possesses a higher increase rate of free-volume content during deformation, and as a result the free-volume contents of all the glasses approach each other at higher strains. Coalescence of free volume in shear bands into nanovoids is proposed to be responsible for the saturation of free-volume content at high strains.     

Journal of Central-South Institute of Mining and Metallurgy (1987)

Generl!Contents(TheI,gu代sin the brackets are the Year,Numbera肚d Page respeetivel了) Geology and MiningT五e Research ont五e Complex Impedence Speetra Data Proeesssng···,···,··一L‘。Daizhi(2057,1,210)Anomalous Disparitv in IP Caused by Eleetrolyte Coneentration in Country Roek ..……‘....……,,........……,....……,............................····..·..·.··.....··.···……附e刀尸efl菌叮(1987,1,110)Applieation of Fuzzy Mathematies to the Classifieation of Roek S…     

Rapid establishment of pure lines of silver carp (Hypophthalmichthys molirix) and bighead carp (Aristichthys nobilis)

The diversity of gynogenetic, artificial sex reversal and natural silver carp and bighead carp is examined using randomly amplified polymorphic DNA (RAPD) method.All of the 187 bands are obtained and 19 (10.16%) of them are polymorphic in gynogenetic silver carp.Meanwhile 32 (15.61%) out of 205 bands are polymorphic in control group.In gynogenetic bighead carp a total of 232 bands are identified and 11 (4.74%) out of them are polymorphic, while 25 (10.37%) out of 241 bands are polymorphic in control group.The genetic distance of four populations is calculated and it is 0.102 and 0.023 for gynogenetic silver carp and gynogenetic bighead carp respectively.The values of natural silver carp and bighead carp are 0.161 and 0.104.From the UPGMA trees constructed based on genetic distance, the sex reversal individuals that match with the gynogenetic female individuals are picked out.A new breeding process of establishing a pure line is developed.     

Quadratic Algebras of Type AIII(Ⅲ)

IntroductionTherepresentationtheoryofMq(n)isrelatedtotherepresentationtheoryofthealgebraoffunctionsonthequantizedSL(n),roughlyspeaking,bysettingthequantumdeterminantequalto1.ThustheinvestigationbySoibelman[1]isofimportance.ThearticlesbyDeConciniandLyubashenko[2]andDeConciniandProcesi[3,4]culminateinacompleteclassificationoftheirreduciblerepresentationsofthequantumfunctionalgebras,correspondingtoasimplecomplexLiegroup,atarootofunity.Besidestheserepresentations,acompletelynewclassofrepresen…     

Optical Properties of Ru(bipy)_2(dppx)~(2 ) in Different Environments

0Introduction Withtheincreasinginterestinginthestudyoftheinter actionbetweenpolypyridylruthenium(Ⅱ)complexesandDNA,ligandsderivedfromvariousmodificationof2,2′bipyridine(bipy)and1,10phenanthroline(phen)havebeen developed.Oneofthemostinterestingobservationsisthedis coveryofthemolecular“lightswitch”complexes[1].Theyarenotphotoluminescentinwaterbutdoemitinnonaqueoussol ventsorinthepresenceofDNA.Atfirst,thecomplexesRu(bipy)2(dppz)2 andRu(phen)2(dppz)2 (dppz=dipyrido[3,2a:2′,3′c]phena zine…     

Quadratic Algebras of Type AIII(Ⅰ)

IntroductionLetg=su(m,n)CbethesimplecomplexLiealgebraoftypeAr;r 1=m n.ThisistheLiealgebracorrespondingtotheHermitiansymmetricspaceoftypeAIII.Letkdenoteamaximalcompactsubalgebraofg,i.e.,k≡s(u(m)×u(n))C.ThenitisacrucialfactinrelationtoanalysisontheHermitiansymmetricspacethatthereexistsadecompositiong=p-kp (1)oftheLiealgebraintoasumofsubalgebrasandwhere,furthermore,p±areabeliank-modules.Thisleadstoadecompositiononthelevelofenvelopingalgebras,U(g)=U(p-).U(k).U(p )(2)andagooddealoftheanal…     

First-Principles Study of ZnO (10(1)0) non- polar Surface

The structure of the ZnO(10 0) non-polar surface is studied using first-principles slab calculations based on density functional theory(DFT). We find that the uppermost zinc atoms have a significant relaxation towards the bulk 0.328 ? ,and the Zn atoms in the second layer show a significant relaxation away from the bulk 0. 237 (A) ,allowing them to appear as surface atoms. For oxygen atoms a small relaxation 0. 146(A) is found. Which leading to a rotation angle 9. 2° of the Zn-O dimer on the surface. Results in excellent agreement with experiment have been obtained for the geometric and electric structures.     

Quadratic Algebras of Type AIII(Ⅱ)

IntroductionTheprimitivespectrumofanoncommutativeaffinealgebraisthenaturalgeneralizationofthevarietyassociatedtoacommutativeaffinealgebra.WhenthenoncommutativealgebraAisadeformationofacommutativealgebraB,oneexpectstofindaclosecorrespondencebetweentheprimitiveidealsofAandthesymplecticleavesoftheassociatedPoissonstructureonthevarietyspec(B).Inthispaper,theprimitivespectrumofthesimplestquadraticalgebraMq(2)oftypeAIII,wasstudied,whichwasconstructedinRef.[1],andthattheprimitiveidealsareinfacton…     

Structure of self-assembled monolayer of NPAN on Au(111) electrode

Recently, much attention has been paid to the self-assembled monolayers (SAMs) or Langmuir-Blodgett films (LB films) of molecules bearing azobenzene group on the surface. Azobenzene derivatives are attractive ow-ing to their interesting photoresoponsive behavior[1—5]. Azobenzene and its derivatives take both trans (E) and cis (Z) structures with respect to the azo linkage and normally exist in the more stable trans form[6]. Being irradiated with appropriate light, organic molecules and po…     

Contents of Volume 10(1993),Journal of China Textile University(English Edition)

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Contents of Volume 13 (1996),Journal of China Textile University (English Edition)

Issue No.; PageStudy on Polypyrrole—viscose Conducting Fiber………………………………………… Jang人anmtw,Zhang Yumei,LIGuang(1一1)Preliminary Study on Open End Jet Spinning………………………………………………………………………… Yu Chongwen(I—9)Blllncar Prcdlctlve Control Using Hierarchical Optimization……………Yang Jian(I—14)The PracticeofRotorSplnnlnglnProduclngSllkNollYarnandtheDeveloPment In Woven Fabrics and Knitted Goods……………………………………………………… Yang…     

Contents of Volume 8 (1991),Journal of China Textile University (English Edition)

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Syntheses of oxysterol receptors‘(LXRs)ligands

The LXRs‘ and agonist,24S,25-epoxycholesterol 1,was synthesized stereoselectively(100%d.e.)in 56% overall yield from methyl hyodeoxycholanate 4 in 9 steps with des mosterol acetate 11 as the key intermediate and the modified Sharpless asymmetric dihydroxylation as the key step.The LXRα subtype selective agonist 5α,6α,24S,25-diepoxycholesterol 2 and the novel LXRs‘ ligand 5β,6β:24S,25-diepoxycholesterol 3 were also synthesized from 1.