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Theor.tical Studies on Cr.tical p.op.r.ies of Binar. System with Sup.r.r.tical Car.on Dioxide

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Chemical r.sear.h in Chinese univ.r.ities 2003年第1期19卷 80-84页

作者： ZHANG Jing chang, LIU Kang and CAO Wei liang Faculty of science, Beijing univ.r.ity of Chemical Technology, Beijing 100029, p. r. china Faculty of science Beijing University of Chemical Technology 北京 100029

A new exp.ession of mixing r.le is suggested accor.ing to the Mayson′s mixing r.le in this p.p.r. which adop.s the r.dlich Kwong cubic equation of state and the modified Chueh p.ausnitz method to calculate the exp.r.ment cr.tical p.ints of six binar. mixtur.s CO 2+toluene, CO 2+cyclohexane, CO 2+ n butanal, CO 2+ i butanal , CO 2+methanol, CO 2+ethanol. The coefficients of inter.ction p.r.meter.in the exp.ession of mixing r.le wer. op.imized fr.m exp.r.mental data. The calculated r.sults of cr.tical temp.r.tur. and cr.tical p.essur. meet the exp.r.ment data well. The maximum r.lative er.or. of temp.r.tur. and p.essur. between the calculation r.sults and exp.r.ment data ar. 1 493. and 5 223.% r.sp.ctively, indicating that the p.op.sed exp.ession of mixing r.le is r.asonable. This may p.ovide a fundamental method for.studying and p.edicting the p.op.r.ies of sup.r.r.tical fluids.

关键词： Sup.r.r.tical fluid Cr.tical p.op.r.ies Binar. system Car.on dioxide

On the Duality Map.ing Sets in Or.icz Sequence Sp.ces

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Acta Mathematica Sinica,English Ser.es 2001年第4期17卷 595-602页

作者： Bao Xiang WANG Dep.r.ment of Mathematics, Hebei univ.r.ity, Baoding 071002, p. r. china Dep.r.ment of Mathematics Hebei University Baoding 071002 P. R. China

The cr.ter.a for.the weak comp.ctness of duality map.ing sets J(x)={f∈X~*:〈f,x〉= ‖f‖~2=‖x‖~2}in Or.icz sequence sp.ces endowed either.with the Luxembur. nor. or.with the Or.icz nor. ar. obtaned.

关键词： Or.icz sequence sp.ces Duality map.ing Weak comp.ctness

Synthesis of Syndiotactic p.lystyr.ne/Atactic p.lyp.op.ne Block Cop.lymer.in the p.esnece of Half-sandwich Titanocene Catalysts

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Chemical r.sear.h in Chinese univ.r.ities 2000年第1期16卷 83-89页

作者： ZHU Fang-ming WU Qing, FANG YU-tang HUANG Qun-fang and LIN Shang-an (Institute of p.lymer.science, Zhongshan univ.r.ity, Guangzhou, 510275, p. r. china) Zhongshan univ Inst Polymer Sci Guangzhou 510275 Peoples R China

Some highly active η~5-p.ntamethylcyclop.ntadienyltr.benzyloxy titanium comp.exes [Cp.Ti(OBz)_3. activated by modified methylaluminoxane (mMAO) wer. p.ep.r.d and used as the catalyst for.styr.ne syndiosp.cific p.lymer.zation and p.op.ne atactic p.lymer.zation. Styr.ne could be cop.lymer.zed with p.op.ne when the p.op.ne was p.ep.lymer.zed for.a p.r.od, to which styr.ne and tr.-isobutylaluminum (TIBA) wer. then added. The titled block cop.lymer.together.with the r.lated homop.lymer. was obtained. The cop.lymer.zation p.r.ucts can be divided into the homop.lymer. and the cop.lymer.by successive solvent extr.ction with boiling butanone, hep.ane and tetr.hydr.fur.n (THF), and each fr.ction was char.cter.zed by ~13. NMr. DSC and WAXD. It was found that ap. and ap. wer. soluble in boiling butanone and hep.ane r.sp.ctively. The block cop.lymer.(sp.-b-ap.) comp.sed of syndiottactic p.lystyr.ne segment was soluble in boiling THF and the r.sidue was chiefly sp..

关键词： Metallocene catalyst Syndiotactic p.lystyr.ne Atactic p.lyp.op.ne Styr.ne and p.eop.ne cop.oymer.zation

Exp.icit Classification for.Tor.ion Subgr.up. of r.tional p.ints of Ellip.ic Cur.es

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Acta Mathematica Sinica,English Ser.es 2002年第3期18卷 539-548页

作者： De r.ng QIU Center.for.Advanced Study, Tsinghua univ.r.ity, Beijing 100084. p. r. china Xian Ke ZHANG Dep.r.ment of Mathematical sciences, Tsinghua univ.r.ity, Beijing 100084, p. r. china Center.for.Advanced Study Tsinghua University Beijing P. R. China Dep.r.ment of Mathematical sciences Tsinghua University Beijing P. R. China

We study the classification of ellip.ic cur.es E over.the r.tionals Q accor.ing to the tor.ion subgr.up. E_(tor.)(Q). Mor. p.ecisely, we classify those ellip.ic cur.es with E_(tor.)(Q) being cyclic with even or.er.. We also give exp.icit for.ulas for.gener.tor. of E_(tor.)(Q). These r.sults, together.with the r.cent r.sults of K. Ono for.the non-cyclic E_(tor.)(Q), comp.etely solve the p.oblem of the exp.icit classification and p.r.meter.zation when E has a r.tional p.int of or.er.2.

关键词： Ellip.ic cur.e r.tional p.int Tor.ion gr.up Mor.ell gr.up p.r.meter.zation

Two Imp.oved Digital Signatur. Schemes

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Jour.al of Systems Engineer.ng and Electr.nics 2001年第1期12卷 78-81页

作者： Lin Bogang Dep.. of Comp.ter.and Technology, Fuzhou univ.r.ity, 3.0002, p. r. china Qiu Hongduan coll.ge of Qiaoxin Light Industr., Fuzhou univ.r.ity, 3.0002, p. r. china Dep.. of Comp.ter.and Technology Fuzhou University 350002 P. R. China coll.ge of Qiaoxin Light Industr. Fuzhou University 350002 P. R. China

In this p.p.r. two imp.oved digital signatur. schemes ar. p.esented based on the design of dir.cted signatur. scheme. The p.culiar.ty of the system is that only if the scheme is sp.cific r.cip.ent, the signatur. is authenticated. Since the scheme adds the scr.en of some infor.ation p.r.meter., the difficulty of decip.er.d keys and the secur.ty of digital signatur. system ar. incr.ased.

关键词： Digital signatur. Message authentication Networ. secur.ty.

The　p.oton　theor.　hyp.thesis　about　p.oton　tunneling　micr.scop.＇s　subwavelength　r.solution

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光电子·激光 1996年第4期7卷 236-239+259页

作者： Yanbin Zhu Junfu Ma(Laser.Li fe science Institute, South china Nor.al univ.r.ity, Guangzhou 51063.,p.r.china) 华南师范大学激光生命科学所广东广州

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关键词： tunneling hyp.thesis micr.scop. about r.solution subwavelength theor. The p.oton

Multi-Modality Medical Image Fusion Based on Wavelet Analysis and Quality Evaluation

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Jour.al of Systems Engineer.ng and Electr.nics 2001年第1期12卷 42-48页

作者： Yu Lifeng & Zu Donglin Institute of Heavy Ion p.ysics, p.king univ.r.ity, 100871, p. r. china Wang Weidong Gener.l Hosp.tal of p.A, Beijing 100853. p. r. china Bao Shanglian Institute of Heavy Ion p.ysics, p.king univ.r.ity, 100871, p. r. china Institute of Heavy Ion p.ysics Peking University 100871 P. R. China Gener.l Hosp.tal of p.A Beijing 10085. P. R. China

Multi-modality medical image fusion has mor. and mor. imp.r.ant ap.lications in medical image analysis and under.tanding. In this p.p.r. we develop.and ap.ly a multi-r.solution method based on wavelet p.r.mid to fuse medical images fr.m differ.nt modalities such as p.T-Mr. and CT-Mr.. In p.r.icular. we evaluate the differ.nt fusion r.sults when ap.lying differ.nt selection r.les and obtain op.imum combination of fusion p.r.meter..

关键词： Comp.ter.simulation Comp.ter.zed tomogr.p.y Image analysis Image quality Image under.tanding Magnetic r.sonance imaging Op.ical r.solving p.wer

FOr.CAST ON FUTUr. LEVEL OF ECONOMY DEVELOp.ENT OF china

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Chinese Geogr.p.ical science 2002年第4期12卷 294-298页

作者： WANG Dian -hai,LI Zhen -fu(School of Communication,jilin univ.er.ity,Changchun 13.025,p.r.Chin a) School of Communication Jilin University Changchun 130025 P. R.China

china is a countr. in the p.r.od of economy takeoff. We cannot use the commonmethod to for.cast its futur. economy level. This p.p.r.establishes an economic level for.castmodel of the countr.es whose economy is in the take off because of the stimulation of model *** enlightenment of the model is fr.m p.ysics. If ther. ar. two substances, A and B, and a mediumbetween them, accor.ing to p.ysics, when substance A is hotter.than B, B's temp.r.tur. willinevitably r.se and close to that of A. Thus, this system tends to be a state of balance. Thr.efactor. affect heat conduction between substance A and B. They ar. the differ.nce of temp.r.tur.between two substances, the conductivity of medium and the char.cter.stics of themselves. The modelis testified thr.ugh two examp.es. And then we for.cast the economic develop.ent level of china inlong ter.. This p.p.r.r.ises a model to solve the p.oblem of r.sear.h ap.r.aches. However. sincether. ar. some limitations on data sour.e, p.oblems will ap.ear. For.examp.e, in cer.ain year., our.or.cast r.sults do not suit the r.al situation. But in the long ter., the tendency is *** this model can be amended in accor.ance with differ.nt situations.

关键词： for.cast economy takeoff model countr.

p.r.llel r.senbr.ck Methods for.Differ.ntialAlgebr.ic Equations

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Jour.al of Systems Engineer.ng and Electr.nics 2001年第2期12卷 73-81页

作者： Fei Jinggao Beijing Institute of Comp.ter.Ap.lication and Simulation Technology 100854, p. r. china Beijing Institute of Comp.ter.Ap.lication and Simulation Technology 100854 P. R. China

A class of p.r.llel r.senbr.ck methods for.differ.ntial algebr.ic equations ar. p.esented in this p.p.r. The local tr.ncation er.or. ar. defined and the or.er.conditions ar. established by using the DA-tr.es and DA-ser.es. The p.p.r.also deals with the conver.ence of the p.r.llel r.senbr.ck methods for.h -> 0 and states the bounds for.the global er.or. of the methods. Some p.r.icular.methods ar. obtained by solving the or.er.equations and a numer.cal examp.e is given, fr.m which the theor.tical or.er. ar. actually obser.ed.

关键词： D Differ.ntial- algebr.ic system p.r.algor.thm r.senbr.ck algor.thm r.senbr.ck method Conver.ence.