[en] Van Weert has shown that the Jones calculus applies only in the paraxial approximation. This idea is related to SU₂ symmetry breaking and it is suggested that a similar type of symmetry breaking of the conformal symmetry in the Weyl theory previously discussed by the author may be acting in the case of the (massive) electron Dirac equation. (author)

[en] An abstract group-theoretical basis for the numerical value of the fine-structure yields a formula which is here interpreted physically. (author)

[en] Conflicting claims in the literature on the compatability of tachyons with general relativity are discussed. (author)

[en] It is examined a possible experimental test of the selection rule M₂sup(A) = 0 in the neutrino production of Nsup(*)(1236) by charged currents, as well as the experimental and theoretical status of the density matrix. (author)

[en] Ion-acoustic waves propagation in cold and inhomogeneous plasma was studied. Two non-linear evolution equations were obtained, to describe the process. (author)

[en] The viewpoint is adopted here that some dibaryon resonances arise from bound states of colored quark clusters, and further consequences of hte model are explored. The most important prediction is that there should exist highly-excited multibaryon resonances of an entirely different kind from previously observed nuclear resonances

[en] Some dissipative effects wich give rise to a decrease of the orbital period Psub(b) for the system PSR 1913+16, are considered. The conclusions are that the examined effects are smaller than the dissipative effect owing to the gravitational radiation

[en] Differential cross-sections for coherent neutron diffraction on deuterons at √s equal to 37,2 GeV are presented. The data were obtained at the CERN Intersecting Storage Rings with colliding deuteron beams, using the split field magnet detector. The analysis of the low-mass differential cross-sections with the Glauber model clearly favours a peripheral description of the elementary nucleon diffraction dissociation process. Only in this case a strong constructive interference between single- and double-scattering amplitude

[en] A generalization with linearly x-dependent coefficients of the nonlinear Schroedinger equation, belonging to the class recently shown to be solvable via the spectral transform, is displayed and the behaviour of its solitons is analyzed

[en] The conductance versus voltage characteristics for an asymmetric tunnel junction by using the method of expansion against small input voltages used by Kwok, Hadded and Lobov is calculated. Assuming a simple trapezodial potential barrier shape it is possible to establish that the asymmetry in the gross shape of the calculated characteristic is of the same order of magnitude as that observed with Pb-I-Al junctions. As expected, the asymmetry is markedly reduced in the case of symmetric Al-I-Al junctions