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| 1 | INFLUENCE OF ION BEAM BOMBARDMENT ON SURFACE PROPERTIES OF POPYURETHANE显示文摘INFLUENCEOFIONBEAMBOMBARDMENTONSURFACEPROPERTIESOFPOPYURETHANEGuHanqing,LuMozhuandDingFuqing(TianjinInstituteofUrologicSurger... | Gu Hanqing, Lu Mozhu and Ding Fuqing(Tianjin Institute of Urologic Surgery, Tianjin, 300211,China)Li De inn and Zhao Jie(Department of PhysicsTianjin Normal University,Tianjin, 300074,China) | 1994 | Chinese Journal of Biomedical Engineering(English Edition)1994，3，1： | 0 |
| 2 | Surface Modification of Medical Polyurethane by Plasma Treatment显示文摘The wettability and surface structure of plasma treatment on medical polyurethane were studied.Two kinds of gas,N_(2),Ar,were used to create the dow-temperature plasma under low pressure.The wettability was investigated by means of the sessile drop method using water,the results show that the contact angle of water decreases from 78.8°to 61.9°as the treatment time increases.The results of electron spectroscopy for chemical analysis indicate that original chemical bonds were broken up after plasma,treatment,which was the main reason for the surface modificatioii.At same time,the results of electron spinning resonance show that the amounts of radicals did not increase significantly after treatment,which is advantageous to clinical practice of polyurethane. | LI Dejun ZHAO Jie GU Hanqing LU Mozhu DING Fuqing HU Jianfang | 1992 | Chinese Physics Letters1992，9，2： | 0 |
| 3 | PREPARATION AND CHARACTERIZATION OF MEDICAL HYDROSCOPIC POLYURETHANE显示文摘A series of uncharged, anionic, cationic, and heparinized polyetherurethanes(PEUs) was synthesized. The soft segments of these PEUs were respectively obtained by polyte-tramethylene oxide of molecular weight 1000 (PTMO-1000), polythylene glycol of molecularweight 1000 (PEG-1000), PEG-4000, and the mixture of PEG-4000 with PTMO-1000 orPEG-1000. The hard segments consisted of 4,4’ -methylene diphenylene diisocyanate (MDI)which was extended with ethylenediamie (ED), 1,4Mbutanediol (BD), N-methyldiethanolamine(MDEA), or L-Sodium α,ε-diaminocaproate (SDAC), respectively. The chemical structure of different PEUs was confirmed by nuclear magnetic resonance. Waterabsorptions were measured. The results showed that the ionic, heparinized PEUs, and the PEUscontained PEG-4000 as soft segments have higher water absorptions than ordinary PEUs. ThePEUs based mainly on PEG-4000 as soft segments are a kind of high hydroscopic polymer mate-rials, and their hydroscopicity increases with PEG-4000 in soft segment. | Gu Hanqing Ding Fuqing Lu Mozhu, Tianjin Institute of Urological Surgery,Tianjin,300211, P. R. C.Sheng Jing, Department of Material Science and Engineering, Tianjin University, Tianjin, 300072, P. R. C. | 1993 | Chinese Journal of Biomedical Engineering(English Edition)1993，2，1： | 0 |
| 4 | Equivalent Kelvin Impact Model for Seismic Pounding Analysis of Bridges显示文摘Based on Hertz contact theory, a method to determine the parameters of Kelvin impact model for seismic pounding analysis of bridges is proposed. The impact stiffness of Kelvin model is determined by the ratio of maximum impact force to maximum contact deformation, which is calculated based on Hertz contact theory with considering the vibration effect. The restitution coefficient which has great influence on the damping coefficient of Kelvin impact model is investigated by numerical analysis. Numerical results indicate that the impact stiffness of Kelvin impact model increases with the increment of the Hertz contact stiffness, approaching velocity or the length ratio of short to long girders. Vibration effect has remarkable influence on the impact stiffness and cannot be neglected. The restitution coefficient decreases when approaching velocity increases or the length ratio of short girder to long girder decreasing. The practical ranges of impact stiffness and restitution coefficient are obtained as 3×108-6×108 N/m and 0.6-0.95 respectively. | DING Yang YUE Fuqing LI Zhongxian | 2006 | Transactions of Tianjin University2006，12，B09： | 0 |
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