A systematic investigation on vapor-liquid equilibria (VLEs) of dipolar and quadrupolar fluids is carried out by molecular simulation to develop a new Helmholtz energy contribution for equations of state (EOSs). Twelve two-center Lennard-Jones plus point dipole and point quadrupole model fluids (2CLJDQ) are studied for different reduced dipolar moments micro*2=6 or 12, reduced quadrupolar momen...

Theoretical models of the equation of state (EOS) of neutronstar matter (starting with the crust and ending at the densest region of the stellar core) are reviewed. Apart from a broad set of baryonic EOSs, strange quark matter, and even more exotic (abnormal and Q-matter) EOSs are considered. Results of calculations of Mmax for non-rotating neutron stars and exotic compact stars are reviewed, w...

The influence of the plug shape on the performance of an aerospike nozzle thrust force is studied in different back pressure conditions. To generate smooth plug contours, Cubic B-Spline technique is employed. In the current research, basis functions are obtained using Deboor’s relation. The flow field around the aerospike nozzle is investigated implementing various shapes and the best of the ge...

in this paper, we investigate the generalizedhyers--ulam stability of the functional equation

Aims. We calculate Keplerian (mass shedding) configurations of rigidly rotating neutron stars and quark stars with crusts. We check the validity of empirical formula for Keplerian frequency, fK, proposed by Lattimer & Prakash, fK(M) = C (M/M⊙) (R/10 km) , where M is the (gravitational) mass of Keplerian configuration, R is the (circumferential) radius of the non-rotating configuration of the sa...

Aims. We calculate the energy release associated with a strong first-order phase transition, from normal phase N to an “exotic” superdense phase S, in a rotating neutron star. Such a phase transition N−→S, accompanied by a density jump ρ N −→ ρ S , is characterized by ρ S /ρ N > 3 2 (1+P0/ρNc ), where P0 is the pressure, at which phase transition occurs. Configurations with small S-phase cores ...

We consider the nonlinear Schrödinger equation with a focusing cubic term and defocusing quintic nonlinearity in dimensions two three. The main interest of this article is problem orbital (in-)stability ground state solitary waves. recall notions energy minimizing versus action states prove that, general, must be considered as nonequivalent. numerically investigate stability least radially symm...