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Oxygen Permeability of Polypropylene Containing Polyisobutene with Magnesium Acetate

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International Journal of Minerals,Metallurgy and Materials 2000年第2期14卷 118-121页

作者： Wei Tian Raymond T. Woodhams(Material Science and Engineering School, university of Science and Technology Beijing, Beijing 100083, China)(Dept. of Chemical Engineering and Applied Chemistry, university of toronto, Torono M5S IA4, Canada) univ Sci & Technol Beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China univ toronto Dept Chem Engn & Appl Chem Toronto ON M5S 1A4 Canada

The oxygen permeabilities of polypropylene films are reduced by adding a minor percentage of a polyisobutene ionomer. The polyisobutene ionomers were prepared by in situ salt exchange of magnesium acetate with maleated polyisobutenes of commercially available low relative molecular mass. The more polar magnesiurn salts aided phase separaion during crystallization from the molten polypropylene mixtusre. Scanning electron microscope photographs revealed that the polyisobotene ionomer is largely concentratd in the amorphous regions between the polypropylene spherulites, where the ionomer tends to concentrate during crystallization. The influence of the polyisobutene ionomer on the oxygen permeability of polypropylene was found to be slightly dependent upon the relative molecular mass of the polyisobutene precursor. Under optimum conditions, the oxygen permeability of polypropylene is reduced by 20%with only 1% additive.

关键词： oxygen permeability polypropylene polyisobutene

Transpacific Community： America, China, and the Rise and Fall of： a Cultural Network. New York： Columbia university Press, 2016

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Frontiers of Literary Studies in China-Selected Publications from Chinese universities 2017年第3期11卷 566-572页

作者： Zhong, Yurou univ toronto Toronto ON Canada

Transpacific Community： America, China, and the Rise and Fall of a Cultural Network is a unique book. By rediscovering and reconnecting a ＂transpacific community＂ of writers, artists, and intellectuals, Richard Jean So accomplishes the unusual feat of contributing to three literary fields--modern American, modern Chinese, and Asian American-in one book. Through extensive archival work and engaging storytelling, So excavates a literary community together with its utopian vision of internationalism, liberalism, and a Sino-American relationship alternative to an Orientalist or Cold War model.

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Laguerre expansion on the Heisenberg group and Fourier-Bessel transform on C^n Dedicated to Professor Sheng GONG on the occasion of his 75th birthday

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Science China Mathematics 2006年第11期49卷 1722-1739页

作者： CHANG Der-Chen GRIENER Peter Department of Mathematics Georgetown university Washington DC 20057USA Department of Mathematics university of toronto TorontoON M5S 3G3Canada

Given a principal value convolution on the Heisenberg group Hn = Cn × R, we study the relation between its Laguerre expansion and the Fourier-Bessel expansion of its limit on Cn. We also calculate the Dirichlet kerne... 详细信息

关键词： Heisenberg group, Fourier transform, Laguerre expansion, Bessel functions,Poisson sum, Dirichlet kernel.

Yan Yu's Canglang shihua and the Chan- Poetry Analogy

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Comparative Literature:East & West 2001年第1期 19-26页

作者： Richard John Lynn univ. of toronto

Yan Yu’s严羽(ca.1195-ca.1245) Canglang shihua沧浪诗话is well known for its Chan-poetry analogy(yi Chan yu shi以禅喻诗),about which much has been written-both in China and *** essential and intriguing aspect of Yan Yu...

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EXPERIMENTAL ANALYSIS FOR SINGULARITIES IN CRACK NORMAL TO BIMATERIAL INTERFACE

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Acta Mechanica Solida Sinica 1998年第2期11卷 180-186页

作者： Kang Yilan Wang Shibin Wang Yangen Tianjin univ Dept Mech Tianjin 300072 Peoples R China Ryerson Polytech Inst Toronto ON M5A 2K3 Canada

Three kinds of the model of crack normal to the bimaterialinterface are studied by an experimental method. The highly sensitivemoire interferometry technique is employed to obtain the displacementfields near the crack tip. The singularities of the three kinds ofmodel are determined and analyzed by the experimental method andcompared and discussed.

关键词： singularities crack normal to interface experimental analysis

The Roper-Suffridge extension operator and classes of biholomorphic mappings Dedicated to Professor Sheng GONG on the occasion of his 75th birthday

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Science China Mathematics 2006年第11期49卷 1539-1552页

作者： GRAHAM Ian KOHR Gabriela Department of Mathematics university of toronto TorontoOntario M5S 2E4Canada Faculty of Mathematics and Computer Science Babes-Bolyai university 1 M. Kogǎlniceanu Str. 400084 Cluj-NapocaRomania

In this paper we give a survey about the Roper-Suffridge extension operator and the developments in the theory of univalent mappings in several variables to which it has led. We begin with the basic geometric properties (most of which now have a number of different proofs)and discuss relations with the theory of Loewner chains and generalizations and modifications of the operator, some of which are very recent.

关键词： convex mapping, starlike mapping, Roper-Suffridge operator, growth theorem, distortion theorem, covering theorem, Loewner chain, parametric representation,extreme points, linear invariant family.

Translational machinery and translation regulation in axon regeneration

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Neural Regeneration Research 2025年第5期20卷 1392-1394页

作者： Homaira Nawabi Stephane Belin univ.Grenoble Alpes InsermU1216Grenoble Institut NeurosciencesGrenobleFrance

Over the centuries,the regeneration field has been puzzled by the dual response of the central nervous system(CNS-brain,spinal cord,cranial nervesⅠandⅡ)and the peripheral nervous system(PNS that refers to all the nerves that innervate muscles,skin,organs,bones among others).Even Ramon y Cajal had noticed that an injury to the PNS often leads to axon regrowth,in contrast to the CNS.

关键词： nerves organs muscles

Some Penrose transforms in complex differential geometry Dedicated to Professor Sheng GONG on the occasion of his 75th birthday

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Science China Mathematics 2006年第11期49卷 1599-1610页

作者： ANCO Stephen BLAND John EASTWOOD Michael Department of Mathematics Brock university 500 Glenridge AvenueSt. CatharinesON L2S 3A1Canada Department of Mathematics university of toronto 100 St. George StreetTorontoON M5S 3G3Canada Department of Mathematics university of Adelaide SA 5005Australia

In this article, we review a construction in the complex geometry often known as the Penrose transform. We then present two new applications of this transform. One concerns the construction of symmetries of the massless field equations from mathematical physics. The otherconcerns obstructions to the embedding of CR structures on the three-sphere.

关键词： Penrose transform, symmetries, massless fields, CR embedding.

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Author Spotlight

CCS Chemistry 2023年第3期5卷 528-530页

作者： Chen, Tao Li, Yunfeng Liu, Yiliu univ Warwick Warwick England Duke univ Durham NC USA Tech univ Dresden Dresden Germany Chinese Acad Sci Ningbo Inst Mat Technol & Engn Beijing Peoples R China univ toronto Dept Chem Lab Prof Eugenia Kumacheva Toronto ON Canada Jilin univ Coll Chem State Key Lab Supramol Struct & Mat Changchun Peoples R China Eindhoven univ Technol Lab Prof Bert Meijer Eindhoven Netherlands South China univ Technol Guangzhou Peoples R China

Tao Chen(陈涛)*** Chen received his *** polymer chemistry and physics from Zhejiang university(China)in *** then joined the university of Warwick(UK)as a Postdoctoral Research Fellow and worked as a Research Scientist at Duke university(USA).He moved back to Europe as an Alexander von Humboldt Research Fellow at Technische universitat Dresden(Germany).He became a Full Professor at Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences in *** research interests focus on bioinspired smart polymeric materials with applications such as actuators,chemical sensing,their integration,and others.

关键词： Ningbo 陈涛 smart