The authors present a higher-order Godunov method for the solution of the twoand three-dimensional equations of ideal magnetohydrodynamics (MHD). This work is based both on a suitable operator-split approximation to the full multidimensional equations, and on a one-dimensional Riemann solver. TIlls Riemann solver is sufficiently robust to handle the nonstrictly hyperbolic nature of the MHD equa...

I review recent constraints on and claimed detections of a time-varying fine-structure constant α. Our results are consistent with no variation in α from the epoch of recombination to the present day, and restrict any such variation to be less than about 4%. The forthcoming MAP and Planck experiments will be able to break most of the currently existing degeneracies between α and other cosmologi...

A detailed comparison between theoretical calculations and recent experiments on laser-excited 6pnp and 6pnf J = O , 1.2 autoionizing levels of Ba is presented. All observables are calculated by a combination of the eigenchannel R-matrix and the multichannel quantum defect theory (MQDT) methods. MQDT analyses of the energy positions of the resonances are presented, and the photoionization spect...

A breakdown of the standard Watson-type rotational Hamiltonian was suggested for a molecule with H2XYZ structure [Š. Urban and K. M. T. Yamada, J. Mol. Spectrosc. 160, 279–288 (1993)] . This breakdown is due to a near-resonant interaction between the ground state rotational levels and rotational levels in an excited vibrational state. This interaction has been observed in the excited electronic...

Superconducting accelerating cavities used in modern particle accelerators change their intrinsic properties when excited to very high field levels close 10 to the critical field where the superconductivity is affected. In this report we describe a test-bench and data analysis procedure to determine the so-called hot S-parameters from strongly driven cavities and use them to quantify the proper...

The nitric oxide vibrationally excited levels in the daytime are studied, at altitudes between 80 and 200 km. For that, we use a coupled 1D Boltzmann kinetic-fluid model to find density profiles of major ions: O2+;N2+;NO+;N+;O+, nitrogen atoms: N(4S);N(2D) levels: NO(v⩽7). A variety processes included calculations that neutrals chemistry, ions photoabsorption, energetic electrons acting on neut...

We present detections of absorption from the ground state and excited states of C I in the z = 1.9731 damped Lyα system of the QSO 0013−004. The excitation temperature between the J = 0 and J = 1 fine-structure levels of C I is 11.6 ± 1.0 K. We estimate other contributions to the excitation of the C I fine-structure levels, and use the population ratio of the excited state to the ground state t...

The magnetization of a Mn12-acetate single crystal was measured with a cantilever magnetometer to temperatures below 60 mK. Contrary to expectations we did not observe steps in the hysteretic magnetization with indices higher than 11. The data suggest a significant degree of higher-order anisotropy. The fourth-order term appears to be about 23310kB . Both hysteresis in magnetization at differen...