Received ; accepted – 2 – ABSTRACT Chandra and XMM-Newton X-ray data reveal that the supersoft X-ray binary CAL 83 exhibits 38.4-minute pulsations at some epochs. These X-ray variations are similar to those found in some novae and are likely to be caused by nonradial pulsations of the white dwarf. This is the first detection of pulsations in a classical supersoft X-ray binary.

The EOS of strongly interacting matter at densities ten to fifteen orders of magnitude larger than the typical density of terrestrial macroscopic objects determines a number of neutron star properties, including the pattern of gravitational waves emitted following the excitation of nonradial oscillation modes. This paper reviews some of the approaches employed to model neutron star matter, as w...

We consider the following coupled elliptic system :  −∆u = μ1u N+2 N−2 + βu 2 N−2 v N N−2 in R −∆v = μ2v N+2 N−2 + βv 2 N−2u N N−2 in R u, v > 0, u, v ∈ D(R ), (S) where N = 3, 4, μ1, μ2 are two positive constants and β < 0 is the coupling constant. We prove the existence of infinitely many positive nonradial solutions.

We find a class of optimal Sobolev inequalities ( ? R N | ? u 2 d x ) ? ? C , G ? D 1 3 where the nonlinear function : ? satisfies general growth assumptions in spirit fundamental works Berestycki and Lions. admit, however, wider problems involving zero, positive infinite mass cases as well need not be even. show that any minimizer is radial up to translation. Moreover, dilation, it least energ...

as regards of supper efficiency models which increased thediscrimination power of the standard dea models, still infeasibility mayoccure. in literature there exists some models overcome this difficulty.in this paper a new procedure has been mooted in order to remove thisshortcoming in a way that both input savings and output surplus arebeing considered. this procedure deals with nonradial chang...