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ON THE CONVERGENCE OF KING-WERNER ITERATIONMETHOD IN BANACH SPACEON THE CONVERGENCE OF KING-WERNER ITERATIONMETHOD IN BANACH SPACE

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Journal of Computational Mathematics 2000年第5期18卷 457-466页

作者： Zheng-da Huang (department of Mathematics, XiXi Campus, zhejiang university,{2., china) department of Mathematics XiXi Campus Zhejiang University Hangzhou 310028 China

In this paper. a Kantorovitch- Ostrowski type convergence theorem and an error estimate of using the information of higher derivatives at the center between initial points for King-Werner iteration method in Banach ... 详细信息

关键词： Information at the center between initial points King-Werner iteration method Convergence Error estimate.

SYNTHESIS AND CHARACTERIZATION OF FOUR-ARMED BLOCK POLY(STYRENE-b-p-NITROPHENYL METHACRYLATE)PREPARED BY THE ATRP METHOD

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Chinese Journal of polymer science 2002年第4期20卷 353-360页

作者： Cai-yuan Pan Lei Tao Ye Liu department of polymer {2. and Engineering university of {2. and Technology of china, Hefei 2.002. china department of polymer {2. and Engineering University of Science and Technology of China Hefei 230026

A novel tetrafunctional initiator, C [CH_2. (CH_2._3 OOCCH(Br)CH_3]_4 (1), was synthesized through the reaction oftetraol with α-bromopropionyl chloride, and then was used as initiator of atom transfer radical polymerization (ATRP) in thepreparation of 4-armed polystyrene (PSt) with narrow polydispersity. The structure, molecular weight and molecular weightdistribution (MWD) of each arm were studied by ~1H-NMR and GPC data of hydrolyzed products of the 4-armed PSt. TheATRP of St using 1/CuBr/bpy as initiator system is of 'living' character based on the following evidence: narrow MWD,constant concentration of chain radical during the polymerization, control of molecular weight by the molar ratio of monomerconsumed to 1. The 4-armed poly(St-b-p-nitrophenyl methacrylate) [poly(St-b-NPMA)] was prepared by the ATRP ofNPMA using 4-armed PSt with terminal bromine as the initiator, and characterized by FT-IR, ~1H-NMR spectra and GPCcurves. The micelles with PSt as core, and PNPMA as shell were formed by dropping DMSO into a solution of 4-armedpoly(St-b-NPMA) in DMF, as proved by laser light scatter (LLS) method.

关键词： Tetrafunctional initiator Atom transfer radical polymerization 4-Armed polystyrene 4-Armed poly(styrene-b-pnitrophenyl methacrylate) Unimolecular micelles

LOCAL WELL-POSEDNESS AND ILL-POSEDNESS ON THE EQUATION OF TYPE □u= u^k(u)~α

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Chinese Annals of Mathematics,Series B 2005年第3期26卷 361-378页

作者： FANGDAOYUAN WANGCHENGBO departmentofMathematics ZhejiangUniversityHangzhou310027China

This paper undertakes a systematic treatment of the low regularity local well-posedness and ill-posedness theory in H3 and Hs for semilinear wave equations with polynomial nonlinearity in u and (?)u. This ill-posed re... 详细信息

关键词： Semilinear wave equation Low regularity Local well-posedness Ill-posedness

Raman studies on the crystallization of sol-gel processed PbTiO_3 thin films

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Chinese science Bulletin 1997年第12期42卷 1052-1055页

作者： ZHU Tao, HAN Gaorong, HAN Zhengfu and DING Zishang1 . department of Materials science and Engineering,{2., hangzhou 31002., china 2.State Key Synchrotron Radiation Laboratory, university of science and Technology of china, Hefei 2.002., china department of Materials science and Engineering Zhejiang University Hangzhou 310027 China

PbTiO3 thin films are of interest to a number of device applications as IR detectors, ultrasonictransducers, etc. Early work on the fabrication of PbTiO3 thin film was mainly based on rfsputtering. Recently, sol-gel p... 详细信息

关键词： Raman spectra PbTiO3 thin films sol-gel process.

GLOBAL EXISTENCE AND ASYMPTOTICS BEHAVIOR OF SOLUTIONS FOR A RESONANT KLEIN-GORDON SYSTEM IN TWO SPACE DIMENSIONS

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Chinese Annals of Mathematics,Series B 2005年第1期26卷 89-104页

作者： XUERUYING FANGDAOYUAN departmentofMathematics ZhejiangUniversityHangzhou310027China departmentofMathematics ZhejiangUniversityHangzhou310027China

The authors study a resonant Klein-Gordon system with convenient nonlinearities in two space dimensions, prove that such a system has global solutions for small, smooth,compactly supported Cauchy data, and find that t... 详细信息

关键词： Klein-Gordon equation Asymptotic behavior Global existence

Constructing a quasi-Legendre basis based on the C-Bézier basis

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Progress in Natural science:Materials International 2005年第6期15卷 559-563页

作者： HUANG Yu* and WANG Guozhao(department of Mathematics, zhejiang university,{2., china) department of Mathematics Zhejiang University Hangzhou 310027 China

In the space Γ_n=span｛sint,cost,1,t,t2.…,t n-2.｝, a C-Bézier basis is constructed by an integral approach. However, the C-Bézier basis is not orthogonal. For some applications, we construct an orthogonal basis based on the C-Bézier basis, which has remarkable properties similar to that of the Legendre basis. Then we derive the transformation matrices that convert the C-Bézier basis and the orthogonal basis into each other. As an example of application, we apply this orthogonal basis to the degree reduction approximation of the C-Bézier curves.

关键词： C-Bézier basis orthogonal basis basis transformations degree reduction.

Preparation and Conductivity of Triheteropoly Tungstozincoaluminic Acid

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Rare Metals 2001年第4期20卷 221-223页

作者： Qingyin Wu department of Chemistry, zhejiang university,{2., china zhejiang Univ Dept Chem Hangzhou 310027 Peoples R China

The ternary undecatungstozincoaluminic heteropoly acid H-7[Al(H2.)ZnW11O39](.)12.(2.O was prepared by the ion exchanging-cooling method. The optimal proportion of solutions of the component elements and the pH of the synthesis reaction were given. The product was characterized by chemical analysis, potentiometric titration, IR, UV, XRD and TG-DTA. AC impedance measurement results show that its proton conductivity is 1.37x10(-4) S/cm at 18 degreesC.

关键词： heteropoly acid tungstozincoaluminic acid protonic conductivity

Preparation and Recipe Optimization of Water-based Architectural Heat Insulation Coatings

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Journal of Wuhan university of Technology(Materials science) 2008年第6期23卷 932-937页

作者：陈立军 School of Chemical Engineering and Materials science Zhejiang University of Technology State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology Zhejiang University of Technology

Water-based architectural heat insulation coatings were studied to overcome the drawbacks of conventional inorganic silicate heat insulation coatings. The heat insulation coatings were prepared with the method of mechanical agitation when the mixed organic polymer emulsions were used as binder of the coatings and the mixed heat insulating aggregates were applied as powder, and some assistants were also added. Water temperature difference in the plastic container, which was coated with heat insulation coatings, represented the heat-insulating property of the coatings. The influences of components of mixed polymer emulsion, mass ratio of polymer emulsion to powder, particle size of heat insulating aggregates, added amount of air entraining admixture and the match of thickeners on the properties of the coatings were studied. The experimental results show that the heat insulation coatings with good finishing, heat-insulation property and artificial weathering can be prepared when the binder is composed of 66.92. styrene-acrylic emulsion, 16.59% elastic emulsion and 16.49% silicone-acrylic emulsion, the mass ratio of polymer emulsion to powder is 0.45, the particle size of heat insulating aggregates is in the rang of 2.0 and 2.0 mesh size, the added amount of sericite is 15%, and the added amount of air entraining admixture is in the range of 1.0% and 1.5% and the thickeners are the mixtures of ASE-60 and RM-5000.

关键词： heat insulation coating polymer emulsion heat insulating aggregate preparation recipe optimization

Synthesis and Conductivity of Undecatungstocobaltoruthenic Polyoxometallic Acid

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Chemical Research in Chinese Universities 2012年第1期28卷 1-3页

作者： XU Sheng-xian1,2. WU Qing-yin2.and YAN Wen-fu3 1. School of Chemistry and Chemical Engineering, Jiangxi science & Technology Normal university, Nanchang 330013, P. R.{2. 2. department of Chemistry, zhejiang university, hangzhou 31002., P. R.{2. 3. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin university, Changchun 130012. P. R.{2. zhejiang Univ Dept Chem Hangzhou 310027 Zhejiang Peoples R China Jiangxi Sci & Technol Normal Univ Sch Chem & Chem Engn Nanchang 330013 Peoples R China Jilin Univ State Key Lab Inorgan Synth & Preparat Chem Changchun 130012 Peoples R China

Undecatungstocobaltoruthenic polyoxometallic acid H7[Ru（H2.）CoW11O39] 2.H2. was synthesized by the stepwise acidification and the stepwise addition of solutions of the component elements as well as the ion ex changing-cooling method. The optimal proportion of the component compound and the pH of the synthesis reaction were given. The product was characterized by means of inductively coupled plasma（ICP）, IR, UV and thermal analy sis. The IR and UV results indicate that H7[Ru（H2.）CoW11O39] 2.H2. possesses the Keggin structure. The results of AC impedance measurement show that its proton conductivity is 2.30×10-3 S/cm at room temperature（2.5 K） and a relative humidity of 75%.

关键词： Polyoxometallic acid Keggin structure Conductivity Ruthenium