MARS 2and 3Interplanetary Stations of the USSR.

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[文献类型]:科技报告
[标题]:MARS 2and 3Interplanetary Stations of the USSR.
[作者]:hofstaetter, r.
[机构]:Techtran Corp.,Glen Burnie,Md.
[关键词]:mars landing,mars probes,satellite design,u,n72-33862,
[出版年份]:1972
[报告号]:NASA-TT-F-14256
[报告时间]:Oct 72,
[页码]:12p
[馆藏索取号]:N72-33862
[总页数]:0


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[唯一标识符]:CDSITC.AEROSPACE.N93-24047
[文献来源]:美国航空航天数据库(aerospace)
[资源原始索取号]:N1993-24047; Reference AN: N93-24047
[标题]:High temperature deformation characteristics of discontinuous fiber reinforced composites
[作者]:BINER S B
[文摘]:Role of the geometrical parameters of the fibers and effects of fiber distribution in the matrix on the creep deformation behavior of 20 percent discontinuous fiber reinforced composite were numerically investigated, including the debonding and fiber pull-out mechanisms. During the analyses in the composite it is assumed that the matrix deforms with a power law creep relationship and the fibers are rigid. Results indicate that for a given fiber geometry and distribution parameters in the matrix, an increase in the interfacial strength or an increase in the work of separation per unit area of interface reduces the secondary creep rates. For even very weak interface characteristics, it is possible to achieve lower secondary creep rates and delayed interface failure by suitable selection of the geometrical parameters of the fibers and by controlling the distribution of the fibers in the matrix. (DOE)
[关键词]:CREEP PROPERTIES; DEFORMATION ; FIBER COMPOSITES; HIGH TEMPERATURE; TEMPERATURE EFFECTS; DEBONDING MATERIALS; FAILURE
[出版年份]:1992
[专业领域]:COMPOSITE MATERIALS
[唯一标识符]:CDSITC.AEROSPACE.A01-31507
[文献来源]:美国航空航天数据库(aerospace);美国航空航天学会会议(AIAA)
[资源原始索取号]:A2001-31507
[标题]:The ignition of the conbustion and detonation in a combusting mix by the undercritical microwave discharge
[作者]:Khodataev Kirill V
[来源]:AIAA-Plasmadynamics-and-Lasers-Conference-32nd-Anaheim-CA-June-11-14-2001
[文摘]:The theory of combustion and detonation ignition and front control in supersonic fuel mixing flow by means of streamer microwave discharge is presented. Two types of subcritical microwave streamer discharge are considered as means of ignition: free and associated discharges. The free streamer discharge can be sustained in a wide cross section of the flow channel without electrodes. The associated discharge is created on the tops of needles. The properties of both types of discharges have been studied by a simulation based on the designed numerical models. The designed models of the streamer microwave discharge are used for numerical modeling of the processes of detonation ignition. In the computational experiments, up to six components of the hydrogen-oxygen mix were used. The conditions of the successful ignition of combustion or detonation are investigated. The ignition of the radial detonation wave by the microwave streamer discharge is clearly illustrated. Opportunities for controlling the detonation or combustion front using the streamer microwave discharge are considered, along with ways to achieve the high efficiency of processes with reference to jet engines. (Author)
[关键词]:IGNITION ; MICROWAVE FREQUENCIES; JET MIXING FLOW; DETONATION ; JET ENGINES; SUPERSONIC COMBUSTION; ELECTRIC DISCHARGES; DETONABLE GAS MIXTURES; HYDROGEN ; OXYGEN ; GAS DISCHARGES; FUEL COMBUSTION
[出版年份]:2001
[专业领域]:Plasma Physics
[馆藏索取号]:A0131507
[总页数]:8