Pressure and compressibility in a quantum one-component plasma
With the help of scaling methods, a general relation is established between the thermodynamic pressure and the mechanical pressure tensor of an equilibrium one-component plasma in a magnetic field. The mechanical pressure tenser is shown to be anisotropic. A general proof of the compressibility sum rule for a magnetized quantum plasma is presented. Finally, fourth-order wavenumber inequalities for the static charge correlation function are derived.
On the compressibility of a one-component plasma
A fluid of charged particles embedded in a neutralising background is considered and, in contradistinction with ordinary fluids, its isothermal compressibility is defined from the k4-term of the small-wavevector expansion (k to 0) of the static structure factor S(k). This compressibility can also be written as a thermodynamic derivative but, contrary to what happens for ordinary fluids, it is not a positive semidefinite quantity, in agreement with the recent numerical results obtained for charged fluids.
Experimental study of thermal modeling for stratospheric platform airships
R&D work on the Japanese stratospheric platform airship is discussed from the viewpoint of the thermal modeling. The work includes two experiments on the thermal characteristics of the 25m-long airship and the 35m-long PV-equipped airship model. The validity of the current thermal model was confirmed by comparing the calculated results with the measured data. The other important work is the Ground-to-Stratosphere (GTS) flight test. A 47mlong airship-shaped balloon was flown to the stratosphere. The flight simulation program into which the thermal model was integrated, was developed and applied successfully to predict the ascent behavior and the flight trajectory.