The finite-size scaling of the free energy levels of Privman and Fisher is tested numerically on two-dimensional lattice strips in the king and q = 3 Potts universality. The universal amplitudes and the free energy per site are obtained. L Turban and J-M DebierreNightingale P and Blote H 1983 J. Phys. A: Math. Gen. 16 L657 Penson K A and Kolb M 1984 Phys. Rev. B 29 2854 Pichard J L and Sarma G 1981 J. Phys. C: Solid Stare Phys. 14 L617 Privman V and Fisher M E 1984 Phys. Rev. B 30 322 Syozi I 1972 Phase transitions andcriticalphenomena vol 1, ed C Domb and M S Green (New York: Academic) Wu F Y 1982 Rev. Mod. Phvs. 54 235 p 269

A mechanical device for making low-pressure, non-solderable electrical contact to irregular specimens is described and its advantages in use are outlined. performed under RRE sponsorship.Abstract A novel method is described of simultaneously locking the frequencies of two independent radio-frequency oscillators to the same magnetic field. Spectra corresponding to two different nuclei (e.g. 19F and lH) may be recorded on the same spectrometer scan, and heteronuclear doubleirradiation experiments performed with great ease. The stability of the doubly locked system is very high, and INDOR spectra may be recorded with a computer of average transients.

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Numerous studies have revealed that the superposition of magnetic field causes plasma-dust structures to rotate in the plane normal to the field. The only explanation for this rotation found in the literature is that the plasma-dust structures are acted upon by the forces of ion entrainment (ion drag forces) from ions moving under the effect of the magnetic field in the azimuthal direction. However, this study demonstrates that the experimentally observed motion of plasma-dust structures cannot be explained by the forces of ion entrainment alone. We show that the observed motion of plasma-dust structures is further affected by their entrainment by gas rotating under the effect of the moment of force IxB , which exists in regions of discharge with nonuniform magnetic field in the vicinity of solenoid end faces, as well as at the narrowing of cross section of the discharge channel. An eddy electric current exists in a discharge with strata in a uniform magnetic field; this current causes the rotation of gas and is associated with the noncollinearity of the gradients of plasma density and temperature. Estimates are provided for the density of this current and for its impact on the rotation of gas in a magnetic field. Recent experimental data by Karasev [Phys. Rev. E 74, 066403 (2003)] are discussed.

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