487 research outputs found
Manned Orbital Transfer Vehicle (MOTV). Volume 3: Program requirements documents
The requirements for geosynchronous orbit capability using the manned orbit transfer vehicle (MOTV) are defined. The program requirements, the mission requirements, and the system and subsystem requirements for the MOTV are discussed. The mission requirements include a geosynchronous Earth orbit vehicle for the construction, servicing, repair and operation of communications, solar power, and Earth observation satellites
Manned Orbital Transfer Vehicle (MOTV). Volume 2: Mission handbook
The use of the manned orbit transfer vehicle (MOTV) for support of future space missions is defined. Some 20 generic missions are defined each representative of the types of missions expected to be flown in the future. These include the service and update of communications satellites, emergency repair of surveillance satellites, and passenger transport of a six man crew rotation/resupply service to a deep space command post. The propulsive and functional capabilities required of the MOTV to support a particular mission are described and data to enable the user to determine the number of STS flights needed to support the mission, mission peculiar equipment requirements, parametrics on mission phasing and requirements, ground and flight support requirements, recovery considerations, and IVA/EVA trade analysis are presented
Manned geosynchronous mission requirements and systems analysis study. Volume 1: Executive summary
The crew capsule of the MOTV was studied with emphasis on crew accommodations, crew capsule functional requirements, subsystem interface definition between crew module and propulsion module, and man rating requirements. Competing mission modes were studied covering a wide range of propulsion concepts. These included one stage, one and one half stage, and two stage concepts using either the standard STS or an augmented STS. Several deorbit concepts were considered, including all propulsive modes, direct re-entry, and aeromaneuvering skip in skip out in the upper reaches of Earth's atmosphere. A five year plan covering costs, schedules, and critical technology issues is discussed
Coherent Pion Production by Neutrinos
I concentrate in this article on the reaction--coherent pion production by
neutrinos incident on nuclei. A special effort is made in order to describe the
approximations entering the calculation. I conclude that the reaction is well
understood and with appropriate data for hadronic reactions is can be computed
for low and high energies. Because of shortage of space I omitted the resonance
analysis, which is described in articles with my collaborators.Comment: 4 pages. Proceedings of Conf. to be published by APS-Proceeding
Manned Orbital Transfer Vehicle (MOTV). Volume 4: Supporting analysis
Generic missions were defined to enable potential users to determine the parameters for suggested user projects. Mission modes were identified for providing operation, interfaces, performance, and cost data for studying payloads. Safety requirements for emergencies during various phases of the mission are considered with emphasis on radiation hazards
Manned Orbital Transfer Vehicle (MOTV). Volume 6: Five year program plan
The five year program plan for the manned orbit transfer vehicle (MOTV) is presented. The planning, schedules, cost estimates, and supporting data (objectives, constraints, assumptions, etc.) associated with the development of the MOTV are discussed. The plan, in addition to the above material, identifies the supporting research and technology required to resolve issues critical to MOTV development
Pion Production in Neutrino-Nucleon Reactions
We construct a model for the weak pion production off the nucleon, which in
addition to the weak excitation of the resonance and its
subsequent decay into , it includes also some background terms required
by chiral symmetry. We re-fit the form factor to the flux averaged
ANL differential cross section data, finding
a substantially smaller contribution of the pole mechanism than
traditionally assumed in the literature. We also show that the interference
between the Delta pole and the background terms produces parity-violating
contributions to the pion angular differential cross section.Comment: To appear in the proceedings of Fifth International Workshop on.
Neutrino-Nucleus Interactions in the Few-GeV Region. May 30, 2007 - June 3,
2007. Fermilab, Batavia, Illinois US
Exotic Bound State Production at Hadron Colliders
Hadronic production of nonrelativistic boundstates of or
isosinglet quarks D with suppressed weak decays is investigated for LHC and SSC
energies. QCD corrections to production and decay rates are incorporated. Large
rates for final states from are predicted.Comment: 7 pages and 13 figures (figures not includes, can be sent upon
request), TTP93-1
Thermal shot noise in top-gated single carbon nanotube field effect transistors
The high-frequency transconductance and current noise of top-gated single
carbon nanotube transistors have been measured and used to investigate hot
electron effects in one-dimensional transistors. Results are in good agreement
with a theory of 1-dimensional nano-transistor. In particular the prediction of
a large transconductance correction to the Johnson-Nyquist thermal noise
formula is confirmed experimentally. Experiment shows that nanotube transistors
can be used as fast charge detectors for quantum coherent electronics with a
resolution of in the 0.2- band.Comment: 3 pages, 4 figure
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