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... It is shown that the efficiency (D-He3) of burning of the D-He3 fuel in space propulsion system can be about 0.2 and higher when the fuel is compressed ...

... Abstract Most discussion of the potential space tourism business considers it as an isolated activity. In the case of sub-orbital tourism this is probably the case and this means any ... if commercially attractive rates of return are assumed. By contrast orbital tourism would be undertaken in the context of other space activity and these can have a significant impact on its ...

... reasons of efficiency, extensibility and mission robustness. Planetary Surface Vehicles (PSVs), that may be used in future manned exploration missions, can especially benefit from reconfigurability. Two frameworks for studying reconfigurable systems ... reconfiguration process to be assessed. The application of these models is shown for a PSV in a future human exploration mission that can reconfigure to respond to changing terrain conditions. The ...

... , increased efficiencies of future propulsion systems are critical to reduce overall life-cycle costs and, in some cases, enable missions previously considered impossible. Continued reliance on conventional chemical propulsion alone will ... needs, the program is laying the technological foundation for travel to nearby interstellar space. The In-Space Propulsion Technology Program's technology portfolio includes many advanced propulsion systems. From the next ...

... Astronautics SETI Permanent Study Group. As a first step, at the 2005 International Astronautical Congress in Fukuoka, we discussed the San Marino Scale, a new analytical tool for assessing transmission risk. That Scale was updated, and a revised version presented at the 2006 IAC in Valencia. We are now in a position to recommend specific improvements to the scale we proposed for quantifying ...

... .60.28 '''Number of Pages''' - 12 Abstract A statistical classification approach for detecting artificial patterns in satellite imagery such as those produced by a technological intelligence, and its application to the ...

... reduced length, and altitude compensating capability. However, it has long been speculated that they suffer in the latter regard due to aspiration of the low speed flow region inside the nozzle by the supersonic jet surrounding it. This effect is investigated in this paper by direct experimental measurement of base pressures, and found to have little effect ...

... British Interplanetary Society for Volume 60 60 '''Page ''' - 443-448 '''Year''' - 2007 '''Keywords''' - Future launcher, in-flight experimentation, re-entry vehicle, reusable launcher vehicle, re-use technologies, Technology Readiness Level '''JBIS ... output potential, and optimization of the synergies with on-ground testing - the selection of preferred in-flight demonstrator concepts. The paper shows the above process, together with details and intermediate results ...

... the overall market without being driven by just one application. This approach may have benefits in terms of cost, performance and risk reduction. However, it is also possible the approach could have a detrimental affect in all these areas and it is argued care must be taken in the systems engineering of such generic components to ensure ...

... of DNA fragmentation. At 5min at modeled microgravity and hypergravity, the histology of the cells in culture and the tissues was altered, microtubules and mitochondria were disorganized. Numerous cells underwent apoptosis ... . These data show that microgravity and hypergravity cause only transient alterations, and tissues and cells in cultures are able to adapt to different gravity conditions. '''To BUY this paper click http ...

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