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Release mechanism for releasing and reattaching experiments on the Space Shuttle
The release mechanism (REM) unlatches an experiment so that it can be moved about inside and outside the shuttle bay by the remote manipulator system (RMS), and then reattaches it to the REM base. Operated from the crew compartment after the RMS has been attached to the experiment, the REM releases the experiment by an electric motor driving a gear train and linkage which extracts four pins from holes in four plates. Electrical connectors on the REM are disengaged by the mechanical action of the structural pins retracting from the plates. When the REM releases the experiment, an unlatched indicator is actuated in the crew compartment, and then the experiment can be moved by using the RMS. To reattach the experiment to the REM, the RMS places the experiment with REM attachment angles against the flat, smooth surface of the REM; then the RMS moves the experiment into position for latchup. Actuation of an electric motor drives the four pins into the four holes in the plates. When fully latched, a switch actuated by the motion of the linkage, shuts the electric motor off and gives an indication to the crew compartment that the REM is latched
Thermodynamic properties of Fermi systems with flat single-particle spectra
The behavior of strongly correlated Fermi systems is investigated beyond the
onset of a phase transition where the single-particle spectrum
becomes flat. The Landau-Migdal quasiparticle picture is shown to remain
applicable on the ordered side of this transition. Nevertheless,
low-temperature properties evaluated within this picture show profound changes
relative to results of Landau theory, as a direct consequence of the flattening
of . Stability conditions for this class of systems are examined,
and the nature of antiferromagnetic quantum phase transitions is elucidated.Comment: 5 pages, 5 figure
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