Improvement of cryogenic fracture toughness of epoxy by hybridization

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[唯一标识符]:CDSITC.AEROSPACE.A97-16670
[文献来源]:美国航空航天数据库(aerospace)
[资源原始索取号]:A1997-16670; Reference AN: A97-16670
[标题]:Improvement of cryogenic fracture toughness of epoxy by hybridization
[作者]:Nishijima S; Hussain M; Nakahira A; Okkada T; Nihara K
[书名]:IN: Better ceramics through chemistry VII: Organic/inorganic hybrid materials; Proceedings of the Symposium, San Francisco, CA, Apr. 8-12, 1996 (A97-16656 03-23), Pittsburgh, PA, Materials Research Society (MRS Symposium Proceedings. Vol. 435), 1996, p. 2
[文摘]:Improvement of the fracture toughness of epoxy at cryogenic temperatures has been carried out aiming at cryogenic application. The macroscopic molecular state of hybrid material was studied, and a possible mechanism to improve the fracture toughness even at cryogenic temperature was discussed. Based on the mechanism, the hybrid materials were prepared by dispersion of silica through hydrolysis of alkoxide. To connect the silica to epoxy molecule, a coupling agent was used. The connection was successfully performed and confirmed by the positron annihilation method. The fracture toughness of the developed hybrid material was found to be approximately 2.6 times higher than that of epoxy itself at liquid helium temperature. (Author)
[关键词]:CRYOGENIC TEMPERATURE; FRACTURE STRENGTH; EPOXY RESINS; POSITRON ANNIHILATION; CURING ; PRESSURIZING
[出版年份]:1996
[专业领域]:NONMETALLIC MATERIALS
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[唯一标识符]:CDSTIC.ISTP.530110
[文献来源]:科学技术会议录索引(ISTP)
[文献类型]:科技会议
[标题]:STIMULATION OF POLARITON EMISSION IN A HOMOGENEOUSLY BROADENED SEMICONDUCTOR MICROCAVITY
[作者]:V MIZEIKIS;J ERLAND;JR JENSEN;NA MORTENSEN;JM HVAM
[出版单位]:SPRINGER-VERLAG BERLINBERLIN
[ISSN_ISBN]:3-540-41778-8
[会议名称]:25th International Conference on the Physics of Semiconductors (ICPS25),OSAKA, JAPAN,September 17-22, 2000
[来源]:PROCEEDINGS OF THE 25TH INTERNATIONAL CONFERENCE ON THE PHYSICS OF SEMICONDUCTORS, PTS I AND II,pp 687-688
[系列名称]:SPRINGER PROCEEDINGS IN PHYSICS
[编辑者]:EN Miura;T Ando
[主办单位]:Int Union Pure & Appl Phys;Japan Soc Appl Phys;Osaka City;Osaka Prefecture;Phys Soc Japan;Sci Council Japan
[地址]:V MIZEIKIS,UNIV_TOKUSHIMA, SATELLITE VENTURE BUSINESS LAB, 2-1 MINAMIJYOSANJIMA, TOKUSHIMA 7708506, JAPAN
[专业领域]:PHYSICS, CONDENSED MATTER,ENGINEERING, ELECTRICAL & ELECTRONIC
[唯一标识符]:CDSITC.AEROSPACE.A94-12057
[文献来源]:美国航空航天数据库(aerospace)
[资源原始索取号]:A1994-12057; Reference AN: A94-12057
[标题]:Validation of a boundary integral formulation for the aerodynamic analysis of rotors in forward flight
[作者]:Renzoni P; Visingardi A; Pagano A
[来源]:AAAF-European-Rotorcraft-Forum-18th-Avignon-France-Sept. 15-18-1992-Paper
[文摘]:A boundary integral formulation for helicopter rotor aerodynamics is validated both in nonlifting and lifting forward flight conditions. In nonlifting conditions the formulation is compared to a finite difference code. The method gives accurate results in the linear flow regime. In lifting conditions, induced velocities on a plane approximately one chord above the tip-path-plane are compared to experiment and to an industrial lifting-line rotor code. There is good agreement with experimental data where fuselage effects are small. Similarities between the lifting-line rotor code and the incompressible version of the boundary integral formulation indicate that classical lifting-line rotor codes may not be 'fully' compressible. (Author)
[关键词]:ROTOR AERODYNAMICS; COMPUTATIONAL FLUID DYNAMICS; ROTARY WINGS; FLOW DISTRIBUTION; FLOW VELOCITY; BOUNDARY INTEGRAL METHOD; FINITE DIFFERENCE THEORY; GREEN'S FUNCTIONS
[出版年份]:1992
[专业领域]:AERODYNAMICS