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Asymptotic Behavior of the Finite Difference and the Finite Element Methods for Parabolic Equations

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Wuhan University Journal of Natural Sciences 2005年第6期10卷 953-956页

作者： LIU Yang FENG Hui Department of Mathematics Wuhan University of Tchnology Wuhan 430070 Huhei China School of Mathematics and Statistics Wuhan University Wuhan 430072 Huhei China

The asymptotic convergence of the solution of the parabolic equation is proved. By the eigenvalues estimation, we obtain that the approximate solutions by the finite difference method and the finite element method are... 详细信息

关键词： asymptotic behavior finite difference method finite element method eigenvalue

Some Results about the Sample Path Properties of Markov Processes with Independent Self-Similar Components

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Wuhan University Journal of Natural Sciences 2005年第6期10卷 945-948页

作者： WU Chuan-ju LIU Lu-qin School of Mathematics and Statistics Wuhan University Wuhan 130072 Hubei China Department of Mathematics Wuhan University of Science and Technology Wuhan 430070 Hubei China

This paper considers a special class of operator self-similar processes Markov processes {X（t）, t≥0} with independent self-similar components, that is, X （ t ） =（X^1（t）,…,X^d（t））, where {X^i（t）,t≥0}, i=1,2,…,d are d independent real valued self-similar Markov processes. By means of Brel-Cantelli lemma, we give two results about asymptotic property as t→∞ of sample paths for two special classes of Markov processes with independent self-similar components.

关键词： self-similar component operator self-similar process self-similar exponent

Effects of Cytokine IL-18 Gene on Antibody Production Induced by Ag85A DNA Vaccine

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Journal of Nanjing Medical University 2004年第4期18卷 215-218页

作者： CHENHai-wen WANGZi-ming FANXiong-lin GANWei-min SHITao XUZhi-kai LIYuan DepartmentofUrology theSecondHospitalofXi＇anJiaotongUniversityXi＇an710004 DepartmentofMicrobiology theFourthMilitaryMedicalUniversityXi＇an71.0033P.R.China

Objective:To investigate the effects of plasmid containing human IL-18 gene on the humoral immune response of mice immunized by Ag85A DNA vaccines of Mycobacterium tuberculosis H 37R v ***: Human IL-18 cDNA was amplified from RNA of peripheral blood mononuclear cells(PBMCs)by RT-PCR and cloned into the pGEM-TEasy *** sequencing IL-18 gene was subcloned into the the sites of BamH Ⅰ and EcoR Ⅰ digestion of pcDNA3.1. BALB/c mice were injected intramuscularly with eukaryotic expression plasmid pcIL18,together with MTB pcAg85A DNA *** same immunization was repeated three times at intervals of two *** sera were collected at two weeks after the each *** titers of anti-Ag85A antibody were detected by ELISA. Results:IL-18 cDNA was amplified successfully from RNA of human PBMCs by RT-PCR and the result of sequencing was *** IL-18 gene was correctly inserted into the vector pcDNA3.1, which was confirmed with BamHⅠ and EcoRⅠ digestion analysis. The positive plasmid was called *** being immunized with DNA vaccines,the titers of antibody obtained from mice being immunized by pcAg85A combining with pcIL18 were superior to mice immunized by pcAg85A ***:Combination of IL-18 gene with MTB pcAg85A DNA vaccine could observably enhance the humoral immune responses to *** remains further investigated whether IL-18 gene plus MTB pcAg85A DNA vaccine could markedly induce the cellular mediated immune response to Ag85A or not.

关键词： mycobacterium tuberculosis Ag85A DNA vaccine IL-18

由二氧化硅直接合成含硅聚氨酯及其表征(英文)

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合成橡胶工业 2004年第4期27卷 247-247页

作者：章永化李瑞雪龚克成华南理工大学高分子系广东广州510640

二氧化硅与乙二醇在催化剂作用下直接合成了五配位硅酸酯 ,然后与氯乙醇反应制得了双羟基含硅化合物 ,该化合物与 2 ,4 -甲苯二异氰酸酯反应得到含硅聚氨酯。采用元素分析、FTIR ,1H -NMR表征了双羟基含硅化合物。结果表明 ,含硅聚氨酯... 详细信息

二氧化硅与乙二醇在催化剂作用下直接合成了五配位硅酸酯 ,然后与氯乙醇反应制得了双羟基含硅化合物 ,该化合物与 2 ,4 -甲苯二异氰酸酯反应得到含硅聚氨酯。采用元素分析、FTIR ,1H -NMR表征了双羟基含硅化合物。结果表明 ,含硅聚氨酯的相对分子质量不高 ,相对分子质量分布比较宽 ,其数均相对分子质量、重均相对分子质量和分布宽度指数分别为 1790 ,6 2 0 0 ,3.4 6。含硅聚氨酯的玻璃化转变温度为 115 .1℃。

关键词：二氧化硅合成含硅聚氨酯表征乙二醇

螺杆冷却时单螺杆挤出熔融的可视化研究(英文)

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合成橡胶工业 2004年第4期27卷 246-246页

作者：邢应生朱复华北京化工大学塑料机械及塑料工程研究所北京100029

利用可视化单螺杆挤出机 ,对螺杆冷却情况下的单螺杆挤出熔融机理进行了研究。实验表明 ,冷却螺杆时固体床始终保持连续而不破碎 ,有利于稳定的挤出过程。在熔融过程中 ,螺槽底部的表面靠近固体床的地方有一层半透明的物质。

关键词：螺杆冷却单螺杆挤出熔融模型亚稳态