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Influence of surface coating on grip comfort of leather steering wheel

Journal of textile Engineering 2011年第6期57卷 139-144页

作者： Murata, Kengoh Kanai, Hiroyuki Kamura, Wataru Morishima, Mika Nishimatsu, Toyonori Graduate School of Science and Technology Master's Program Shinshu University Ueda Nagano 386-8567 Japan Faculty of Textile Science and Technology Shinshu University Ueda Nagano 386-8567 Japan

We investigated how the surface coating of leathers influenced 'touch feeling' and 'grip comfort' of leather steering wheels. Four leather sheets coated by different urethane coating materials and four steering wheels covered by these leathers were used as samples. Both 'touch feeling' of the leather sheets and 'grip comfort' of the steering wheels were evaluated by the paired comparison method. Then each mean preference score of 'touch feeling' and 'grip comfort' was examined by the principal component analysis. From the result, it was found that 'moisture' and 'smoothness' were identified as principal factors of 'touch feeling' and 'grip comfort'. And the physical properties (i.e. compression, friction, surface roughness, and q-max) of the leather sheets were measured. The relationship between the subjective evaluation (i.e. 'touch feeling' and 'grip comfort') and these measured physical properties were investigated. From the result, it was found that 'moisture' was correlated significantly with 'MIU/MMD' (MIU: mean coefficient of friction, MMD: mean deviation of MIU) and 'dry' was correlated significantly with 'Ra' (arithmetic mean deviation of the roughness profile). The measuring method of the physical properties was viable approach for the quantitative evaluation of 'grip comfort'. © 2011 The textile Machinery Society of Japan.

关键词： Coatings

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Cover Picture: Highly Efficient Capture of Circulating Tumor Cells by Using Nanostructured Silicon Substrates with Integrated Chaotic Micromixers (Angew. Chem. Int. Ed. 13/2011)

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Angewandte Chemie International Edition 2011年第13期50卷

作者： Dr. Shutao Wang Dr. Kan Liu Dr. Jian Liu Dr. Zeta T.-F. Yu Xiaowen Xu Libo Zhao Tom Lee Dr. Eun Kyung Lee Jean Reiss Prof. Yi-Kuen Lee Prof. Leland W. K. Chung Prof. Jiaoti Huang Prof. Matthew Rettig Prof. David Seligson Dr. Kumaran N. Duraiswamy Prof. Clifton K.-F. Shen Prof. Hsian-Rong Tseng Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing (P. R. China) College of Electronics and Information Engineering Wuhan Textile University Wuhan (P. R. China) Uro-oncology Research Program Samuel Oschin Comprehensive Cancer Institute Cedars Sinai Medical Center Los Angeles (USA) Department of Pathology and Laboratory Medicine University of California Los Angeles (USA) Department of Mechanical Engineering The Hong Kong University of Science and Technology (Hong Kong) Department of Urology University of California Los Angeles (USA)

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Titelbild: Highly Efficient Capture of Circulating Tumor Cells by Using Nanostructured Silicon Substrates with Integrated Chaotic Micromixers (Angew. Chem. 13/2011)

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Angewandte Chemie 2011年第13期123卷

作者： Shutao Wang Kan Liu Jian Liu Zeta T.‐F. Yu Xiaowen Xu Libo Zhao Tom Lee Eun Kyung Lee Jean Reiss Yi‐Kuen Lee Leland W. K. Chung Jiaoti Huang Matthew Rettig David Seligson Kumaran N. Duraiswamy Clifton K.‐F. Shen Hsian‐Rong Tseng Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing (P. R. China) Department of Molecular and Medical Pharmacology Crump Institute for Molecular Imaging (CIMI) California NanoSystems Institute (CNSI) Institute for Molecular Medicine (IMED) University of California Los Angeles 570 Westwood Plaza Building 114 Los Angeles CA 90095‐1770 (USA) Fax: (+1) 310‐206‐8975 http://labs.pharmacology.ucla.edu/tsenglab/ College of Electronics and Information Engineering Wuhan Textile University Wuhan (P. R. China) Uro‐oncology Research Program Samuel Oschin Comprehensive Cancer Institute Cedars Sinai Medical Center Los Angeles (USA) Department of Pathology and Laboratory Medicine University of California Los Angeles (USA) Department of Mechanical Engineering The Hong Kong University of Science and Technology (Hong Kong) Department of Urology University of California Los Angeles (USA)

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Highly Efficient Capture of Circulating Tumor Cells by Using Nanostructured Silicon Substrates with Integrated Chaotic Micromixers†

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Angewandte Chemie 2011年第13期123卷

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Durability of a conducting shape memory polyurethane actuator

Durability of a conducting shape memory polyurethane actuato...

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17th International Conference on Adaptive Structures and Technologies, ICAST 2006

作者： Goo, N.S. Paik, I.L. Jung, Y.C. Cho, J.W. Intelligent Microsystem Program Department of Advanced Technology Fusion Konkuk University Seoul 143-701 Korea Republic of Department of Aerospace Engineering Konkuk University Seoul 143-701 Korea Republic of Department of Textile Engineering Konkuk University Seoul 143-701 Korea Republic of

ISBN: (纸本)9781605601250

This paper discusses the actuation durability of a conducting shape memory polyurethane (CSMPU) actuator. Introduced in 2004, the CSMPU actuator was manufactured by an in situ polymerization method for shape memory polyurethane with multiwalled carbon nanotubes. In order to apply the CSMPU to smart actuators and determine detailed design concepts, the durability data should be measured. Hence, the experiments in this research were designed to obtain durability data, and the maximum number of actuation cycles versus the initial elongation ratio and the actuation temperature were measured for the purpose of assessing durability. The broken surfaces of the specimens were investigated.

关键词： Durability

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A model of tripeptidyl-peptidase I (CLN2), a ubiquitous and highly conserved member of the sedolisin family of serine-carboxyl peptidases

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BMC Structural Biology 2003年第1期3卷 1-10页

作者： Wlodawer, Alexander Durell, Stewart R. Li, Mi Oyama, Hiroshi Oda, Kohei Dunn, Ben M. Protein Structure Section Macromolec. Cristal. Laboratory National Cancer Institute Frederick MD 21702 United States Lab. of Exp. and Compl. Biology National Cancer Institute Bethesda MD 20892 United States Basic Research Program SAIC-Frederick Inc. National Cancer Institute Frederick MD 21702 United States Department of Applied Biology Faculty of Textile Science Kyoto Institute of Technology Sakyo-ku Kyoto 606-8585 Japan Dept. of Biochem. and Molec. Biology University of Florida Gainesville FL 32610 United States

Background: Tripeptidyl-peptidase I, also known as CLN2, is a member of the family of sedolisins (serine-carboxyl peptidases). In humans, defects in expression of this enzyme lead to a fatal neurodegenerative disease, classical late-infantile neuronal ceroid lipofuscinosis. Similar enzymes have been found in the genomic sequences of several species, but neither systematic analyses of their distribution nor modeling of their structures have been previously attempted. Results: We have analyzed the presence of orthologs of human CLN2 in the genomic sequences of a number of eukaryotic species. Enzymes with sequences sharing over 80% identity have been found in the genomes of macaque, mouse, rat, dog, and cow. Closely related, although clearly distinct, enzymes are present in fish (fugu and zebra), as well as in frogs (Xenopus tropicalis). A three-dimensional model of human CLN2 was built based mainly on the homology with Pseudomonas sp. 101 sedolisin. Conclusion: CLN2 is very highly conserved and widely distributed among higher organisms and may play an important role in their life cycles. The model presented here indicates a very open and accessible active site that is almost completely conserved among all known CLN2 enzymes. This result is somehow surprising for a tripeptidase where the presence of a more constrained binding pocket was anticipated. This structural model should be useful in the search for the physiological substrates of these enzymes and in the design of more specific inhibitors of CLN2.

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Kinetics of water swelling and development of porous structure in ionic poly(acrylonitrileacrylamide-acrylic acid) hydrogels

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POLYMER 1996年第6期37卷 1019-1025页

作者： Hu, DSG Chou, KJN Program in Polymers Department of Textile Engineering National Taiwan Institute of Technology Taipei Taiwan 107 ROC

The kinetics of water uptake into the dry form of, and benzoic acid diffusion through, swollen inhomogeneous poly(acrylonitrile-acrylamide-acrylic acid) gels were investigated with gravimetry and ultra-violet visible spectroscopy, respectively. The goal is to understand the effects of ionizable moieties and water-polymer affinity on the rate of water diffusion during the formation of hydrogels from glassy polymers and on the free-volume mechanism for solute transport through the resulting swollen networks. The xerogel with intermediate acid content or minimal affinity with water has the maximum water diffusion coefficient in the initial swelling stage and the maximum deviation from Fickian transport. The molecular diffusion of benzoic acid through hydrogels was found to be controlled by the swelling, and the size of voids for solute diffusion does not remain constant over all the range of compositions. This discrepancy from the simple free-volume theory is due to a wide range of molecular interactions for gels with amide/acid moieties. In conclusion, dynamic swelling is influenced by water-polymer affinity and subsequently causes various types of steady transport in hydrogels.

关键词： dynamic swelling solute diffusion ionic hydrogels

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Correlation between interfacial free energy and albumin adsorption in poly(acrylonitrile-acrylamide-acrylic acid) hydrogels

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JOURNAL OF APPLIED POLYMER SCIENCE 1996年第12期59卷 1809-1817页

作者： Hu, DSG Tsai, CE Program in Polymers and Textiles Department of Textile Engnineering National Taiwan Institute of Technology Taipei Taiwan 10772 Republic of China

An investigation on the influence of chemical compositions and surface properties (e.g., surface free energy in air and hydrogel-water interfacial energy) on the adsorption of bovine serum albumin (BSA) at pH 7.4 on to a series of poly(acrylonitrile-acrylamide-acrylic acid) hydrogels was carried out. The interfacial energetics were determined from the contact angle data for air-gel and octane-gel in the water environment and the specific adsorption of BSA was determined with UV-VIS spectroscopy. It is shown that the higher contents of amide and acid groups in hydrogel bulk lead to the greater polar component of surface energy in air and the greater BSA adsorption in aqueous solutions. The BSA adsorption decreases with water amount in gels at lower amide/acid contents and increases at higher contents. The results imply that the interfacial interactions between the protein and the reorganized hydrogel interface in exposure with water, as well as the penetration of protein into pores of swollen gels, influence the BSA adsorption. (C) 1996 John Wiley & Sons, Inc.

关键词： Hydrogels

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Toughening isotactic polypropylene and propylene-ethylene block copolymer with stylene-ethylene butylene-styrene triblock copolymer

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Journal of Polymer Research 1995年第1期2卷 21-21页

作者： Chiu, H.-T. Shiau, Y.-G. Chiu, W.-M. Syau, S.-S. Research Program for Polymer and Textile National Taiwan Institute of Technology Taipei Taiwan ROC

Dynamic mechanical properties, low-temperature impact behavior, flexural modulus and heat distortion temperature (HDT) of isotactic polypropylene (i-PP) and propylene-ethylene block copolymer (Co-PP) toughened with styrene-ethylene butylene-styrene triblock copolymer (SEBS), at blending ratios of 0–30 phr, were studied and compared. A scanning electron microscopic morphology study of the impact-fractured surfaces demonstrated the changes in fracture mechanisms at various temperatures and SEBS contents. SEBS remarkably improves the impact endurance in the lower-temperature range when blended with Co-PP in comparison with i-PP, due to the increased compatibility in the interface between SEBS particles and the Co-PP matrix.

关键词： Blend Polypropylene Propylene-ethylene block copolymer Styrene-ethylene butylene-styrene (SEBS) Toughening

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WATER-POLYMER INTERACTIONS AND CRITICAL PHENOMENA OF SWELLING IN INHOMOGENEOUS POLY(ACRYLONITRILE-ACRYLAMIDE-ACRYLIC ACID) GELS

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POLYMER 1994年第20期35卷 4416-4422页

作者： HU, DSG LIN, MTS Program in Polymers and Textiles Department of Textile Engineering National Taiwan Institute of Technology Taipei Taiwan 107 Republic of China

The water uptake and swelling behaviour of physically crosslinked, inhomogeneous poly(acrylonitrile-acrylamide-acrylic acid) hydrogels from 10 to 60 degrees C were determined by gravimetry/differential scanning calorimetry and volume measurement, respectively. The contents of water and its non-bound portion were found to reach a minimum value at acrylamide content around 33.5 mol%, at which the water uptake of this gel does not vary with the temperature. The non-bound water was found to decrease gradually and then increase with increasing amide concentration. The duration of the post-gelation treatment between -10 and 10 degrees C was also shown to be one of the factors affecting the extent of the water uptake in gels. The critical endpoint temperatures (T(c)s) of hydrogels, obtained from volume phase transition data upon changing the acetone concentration in aqueous solutions at various temperatures, were shown to decrease with the increasing acid or amide contents. The water uptake for gels with lower amide contents decreases with increasing temperature. However, there is an opposite trend for water uptake in gels with higher amide content, and the critical points on the plots of the amount of water uptake versus temperature appear at a temperature equal to T-c.

关键词： INHOMOGENEOUS HYDROGELS SWELLING PHASE TRANSITION

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