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Dynamic interaction between structure and liquid propellants in a space shuttle vehicle model, part 1 Final report
Dynamic interaction between structure and liquid propellants in space shuttle vehicle model
Coupling between structure and liquids in a parallel stage space shuttle design
A study was conducted to determine the influence of liquid propellants on the dynamic loads for space shuttle vehicles. A parallel-stage configuration model was designed and tested to determine the influence of liquid propellants on coupled natural modes. A forty degree-of-freedom analytical model was also developed for predicting these modes. Currently available analytical models were used to represent the liquid contributions, even though coupled longitudinal and lateral motions are present in such a complex structure. Agreement between the results was found in the lower few modes
Investigation of the composition of the Luna 16 lunar sample
The concentrations of aluminum, manganese, sodium, chromium, iron, cobalt, and 12 rare earth elements were determined by neutron activation analysis using slow neutrons. Oxygen and silicon were determined using a fast neutron generator. Mossbauer spectroscopy was used to investigate iron compounds in Luna 16 regolith samples from the upper part of the core
Interplay of fixed points in scalar models
We performed the renormalization group analysis of scalar models exhibiting
spontaneous symmetry breaking. It is shown that an infrared fixed point appears
in the broken symmetric phase of the models, which induces a dynamical scale,
that can be identified with the correlation length. This enables one to
identify the type of the phase transition which shows similarity to the one
appearing in the crossover scale. The critical exponent of the
correlation length also proved to be equal in the crossover and the infrared
scaling regimes.Comment: 11 pages, 4 figure
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