Experiments on the influence of a magnetic field on the thermal diffusion (DT) have been performed. Both the transverse coefficient, DtrT, as well as the difference between the longitudinal coefficients, D⊥T − DT, were measured for binary mixtures of N2, nD2, HD and nH2 with the nob le...

The method given in part I of the present paper is applied to the single-mode laser model. The treatment is based on two coupled equations for the Glauber distribution function of the field and for another distribution, which is linked in a simple way to the atomic inversion. It is shown that...

A theory is developed concerning the excitation spectrum arising from the interaction between two-identical three-level atoms (molecules), one of which is excited in the presence of a strong resonant electromagnetic field (pump field). General expressions for the Green's functions are derived in...

It is well known that in the uniaxial ferromagnet in the presence of an external magnetic field perpendicular to the easy axis (hx) a continuous phase transition occurs for a critical value of this field. There are metastable and stable states if one includes a small field parallel to the easy...

We give the double and single logarithmic radiative (order α) corrections to νμe and νμe scattering cross sections for the case of high energy incident neutrinos and high energy recoil electrons scattered in a bubble chamber. We use the exact bremsstrahlung cross section so that both...

The paper reports measurements of the viscosity of normal butane and isobutane at atmospheric pressure in the temperature range 25–195°C. In addition, the viscosity of mixtures of the two gases has been determined in the more limited temperature range 25–100°C. The absolute accuracy of the...

The main theoren about the exactness of the generalized version of the Bogoliubov (Jr.) thermodynamically-equivalent Hamiltonian method for Dicke-type models which include some hidden variables, is proved. Some generalizations are done of earlier investigations according to a Dicke-type model...

A detailed study is made of wave propagation according to a sixth-order partial differential equation with complex masses proposed by Swieca and Marques, which presents a kind of generalized Klein-Gordon equation. The choice of definite Green's functions in the corresponding Yang-Feldman...

The friction coefficient for a spherical Brownian particle neat the Bénard-Rayleigh convective instability is evaluated. It is shown that sufficiently close to the instability point this coefficient tends to zero as ϵ12 · ϵ = (Rc − R)⧸RC where R is the Rayleigh number and Rc its critical...

Through an analysis of the expression of the autocorrelation function of the velocities in the matrix representation, an identification is made of all the matrix elements which lead to the so-called t or ϵ explicit divergence. The terms in the expansion can be easily summed and as a result the...