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ON THE SOLVABILITY OF GENERAL LINEAR METHODS FOR DISSIPATIVE DYNAMICAL SYSTEMS

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Journal of Computational Mathematics 2000年第6期18卷 633-638页

作者： Ai-guo xiao (Department of Mathematics, Xiangtan University, Xiangtan 411105, china.) (institute of Computational Mathematics and Scientific/Engineering Computing, chinese academy of sciences, beijing 100080, china) 湘潭大学湖南湘潭 4111105

The main purpose of the present paper is to examine the existence and local uniqueness of solutions of the implicit equations arising in the application of a weakly algebraically stable general linear methods to dissipative dynamical systems, and to extend the existing relevant results of Runge-Kutta methods by Humphries and Stuart(1994). [ABSTRACT FROM AUTHOR]

关键词： general linear methods dissipative dynamical systems weak algebraic stability solvability

Conformational Studies of Arabinoglucuronomannology (AGM)

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生物物理学报 1996年第4期12卷 547-553页

作者： Imshik Lee Bai Chunli Wang Chen (institute of chemistry, chinese academy of sciences, beijing, 100080) 中科院化学所北京

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关键词： Arabinoglucuronomannology(AGM) X - ray diffraction Conformation Relative humidity (RH)

SUBSPACE SEARCH METHOD FOR A CLASS OF LEAST SQUARES PROBLEM

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Journal of Computational Mathematics 2000年第2期18卷 133-140页

作者： Zi-Luan Wei (institute of Computational Mathematics and Scientific / Engineerin Computing, chinese academy of sciences, P.O. Box 2719, beijing 100080, china) 中科院计算数学与科学工程计算所北京 100080

Presents information on a study which described a subspace search method for solving a class of least squares problem. Derivation of the algorithm; Convergence results; Modification of algorithm and applications.

关键词： subspace search method A class of least squqres problem convergence analysis.

Synthesis of Monoclinic Form of Gd_(2-x)Na_xCuO_4 by Direct Precipitation from Molten Salt

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chinese Chemical Letters 2000年第2期11卷 185-188页

作者： Lin ZHANG Liang Zhong ZHAO Jin Biao ZHANG Cui Ying XU shi Hong LIU (institute of chemistry, chinese academy of sciences, beijing, 100080) chinese Acad Sci Inst Chem Beijing 100080 Peoples R China

A new phase of Gd_(2-x)Na_xCuO_4 was synthesized by direct precipitation from the mixture of Gd_2O_3 and CuO in the molten KOH/NaOH/KNO_3 solution at temperature as low as 280℃. The resulting precipitate was characterized by using SEM, XRD, EDX, XPS and magnetic method. The XRD data indicate that the precipitated Gd_(2-x)Na_xCuO_4 is monoclinic with lattice parameters a=8.6816, b=3.7233. c=6.0796. a=γ=90', 0=108.75° and V=186. 13.

关键词： Chemical synthesis gadolinium cuprate monoclinic phase.

Mechanism and Defense on Malicious Code

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Wuhan University Journal of Natural sciences 2005年第1期10卷 83-88页

作者： WEN Wei-ping 1,2,3, QING Si-han 1,2,31. institute of Software, the chinese academy of sciences, beijing 100080, china 2.Engineering Research Center for Information Security Technology, the chinese academy of sciences, beijing 100080, china 3.Graduate School of the chinese academy of sciences, beijing 100080, china institute of Software the Chinese Academy of Sciences Beijing 100080 China

With the explosive growth of network applications, the threat of the malicious code against network security becomes increasingly serious. In this paper we explore the mechanism of the malicious code by giving an attack model of the malicious code, and discuss the critical techniques of implementation and prevention against the malicious code. The remaining problems and emerging trends in this area are also addressed in the paper.

关键词： malicious code attacking model mechanism defense system security network security

SYNTHESIS AND CHARACTERIZATION OF BIS-[2-[[(2-ALKOXYPHENYL)IMINO]METHYL]-PHENOLATO-O,N,O]NICKEL(II)COMPLEXES AND THEIR NORBORNENE POLYMERIZATION

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chinese Journal of Polymer Science 2005年第6期23卷 619-626页

作者： Dong-heng Zhang Su-yun Jie Hai-jian Yang Fei Chang and Wen-hua Sun Key Laboratory of Engineering Plastics,institute of chemistry,chinese academy of sciences,beijing 100080,china chinese Acad Sci Inst Chem Key Lab Engn Plast Beijing 100080 Peoples R China

A series of salicylaldimines, synthesized in high yield via microwave-assisted condensation of salicylaldehyde and 2-alkoxyaniline were allowed to react with nickel chloride to form six-coordinated nickel complexes. These nickel complexes were carefully characterized, and the solid structure of la was elucidated by X-Ray diffraction. Activated with MAO, the nickel complexes showed good activity for homopolymerization of norbornene. Reaction parameters, such as the ratio of nickel precursor to MAO, monomer concentration, reaction time and the reaction temperature, as well as the nature of the ligands were found to have significant effects on the catalytic activity and some properties of the resulting polynorbornene.

关键词： Salicylaldirnine Nickel complex Norbornene Vinyl polymerization

Polymerization of Bisphenol A Epoxy Resin with Polyethylene glycol

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chinese Chemical Letters 1997年第8期8卷 725-728页

作者： Zhen Zhong YANG De Lu ZHAo Mao XU(Polymer Physics Laboratory, institute of chemistry, The chinese academy of sciences, beijing 100080) chinese ACAD SCI INST CHEMPOLYMER PHYS LABBEIJING 100080PEOPLES R CHINA

The catalyst boron trifluoride etherate was used to catalyze the reaction of epoxy resin with polyethylene glycol (PEG), and the effect of the concentration of the catalyst on the reaction is studied. It is shown that there exist two competitive reactions : I, self polymerization of epoxy resin via chain growth and II, copolymerization of epoxy resin with PEG via step growth. At high concentration of the catalyst reaction I dominates and reaction II is negligible. On the contrary, at low concentration of the catalyst, reaction II dominates and block copolymers are formed In the intermediate case, the two reactions are comparable with the result that a gel structure is obtained.

关键词： PEG Polymerization of Bisphenol A Epoxy Resin with Polyethylene glycol

Recent progress in fingerprint recognition

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Progress in Natural Science:Materials International 2006年第3期16卷 231-240页

作者： TIAN Jie, CHEN Xinjian, ZHANG Yangyang, YANG Xin, HE Yuliang, LI Liang, XIE Weihua and ZHENG Zhipeng (Center for Biometrics and Security Research, Key Laboratory of Complex Systems and Intelligence Science, institute of Automation, chinese academy of sciences, beijing 100080, china Graduate School of the chinese academy of sciences, beijing 100080, china) [a]Center for Biometrics and Security Research Key Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences Beijing China [b]Graduate School of the chinese academy of sciences Beijing China

Fingerprint recognition has been increasingly used to realize personal identification in civilian' s daily life, such as ID card, fingerprints hard disk and so on. Great improvement has been achieved in the on-line fingerprint sensing technology and automatic fingerprint recognition algorithms. Various fingerprint recognition techniques, including fingerprint acquisition, classification, enhancement and matching, are highly improved. This paper overviews recent advances in fingerprint recognition and summarizes the algorithm proposed for every step with special focuses on the enhancement of low-quality fingerprints and the matching of the distorted fingerprint images. Both issues are believed to be significant and challenging tasks. In addition, we also discuss the common evaluation for the fingerprint recognition algorithm of the Fingerprint Verification Competition 2004 (FVC2004) and the Fingerprint Vendor Technology Evaluation 2003 (FpVTE2003), based on which we could measure the performance of the recognition algorithm objectively and uniformly.

关键词： biometrics fingerprint enhancement matching minutia image registration similarity measures.

A Facile Synthesis Route to 1,3-dichlorodisilazanes

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chinese Chemical Letters 2000年第9期11卷 765-766页

作者： Cai Hong XU Ning ZHOU Ze Min XIE Center for Molecular Science, institute of chemistry, the chinese academy of sciences, beijing 100080 Acad Sinica Inst Chem Ctr Mol Sci Beijing 100080 Peoples R China

A new 1,3-dichlorodisilazane, 1,3-dichloro-1,3-dimethyl-1,3-divinyldisilazane (DMDV), was prepared from the reaction of hexamethyldisilazane (MMN) and methylvinyldichlorosilane. And use the same method, 1,3-dichloro-1... 详细信息

关键词： Silazanes synthesis dichlorodisilazanes