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[en] Analytical expansions for the radial density function D(r) and expectation values of rsup(n), -2<=n<=5, as calculated within the Hartree-Fock approximation, are reported for a large number of ions of the first 54 elements. (author)

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[en] The propagation of weakly nonlinear ion-acoustic waves in an inhomogeneous plasma is studied taking into account the effect of finite ion temperature. It is found that, whereas both the amplitude and the velocity of propagation decrease as the ion-acoustic solitary wave propagates into regions of higher density, the effect of a finite ion temperature is to reduce the amplitude but enhance the velocity of propagation of the solitary wave. (author)

[en] We propose a simple experiment to measure the speed of gravity in the laboratory. A moving body induces changes in the gravitational field that travel to the detector with a finite time delay. Moving two bodies causes changes to the gravitational field. These changes can add or subtract, and observing this interference allows for the measurement of the speed of gravity. (author)

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[en] The diffusion constant D for H atoms bound to the surface of liquid sup(4)He is calculated from the Boltzmann equation in the relaxation time approximation. The dominant process for momentum relaxation is found to be the emission and absorption of ripplons. Long wavelength ripplons are shown to couple very weakly to bound H atoms, implying a strong temperature dependence of the relaxation time at low T, (tau) approximately 2 x 10sup(-14)Tsup(-9/2) s for T < 10sup(-3) K. For the experimental temperature range, 0.1 < T < 0.3 K, (tau) is rather long, by which we mean that the mean free path I=anti v(tau) is several thermal De Broglie wavelengths, Λ, i.e. l > 30 Λ for T < 0.3 K. We conclude that surface spin relaxation calculations based on binary collisions of freely propagating H atoms are appropriate for H on liquid sup(4)He and that the hydrodynamic contribution to 1/Tsub(l), due to interactions with ripplons, is negligible

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