porosity is one of the fundamental petrophysical properties that should be evaluated for hydrocarbon bearing reservoirs. it is a vital factor in precise understanding of reservoir quality in a hydrocarbon field. log data are exceedingly crucial information in petroleum industries, for many of hydrocarbon parameters are obtained by virtue of petrophysical data. there are three main petrophysical...

Measurement of the fuel ion density ratio, nD/nT, is required for burning control in ITER. The measured nD/nT ratio must be fed back in real time. A neutron measurement system to measure nD/nT should be operable at high counting rate. The estimated number of emitted DT neutrons is 200 times higher than that of DD neutrons under the ITER standard operation conditions. A neutron measurement syste...

Relativistic nuclear energy density functionals (RNEDF) have become a standard framework for nuclear structure studies of ground-state properties and collective excitations over the entire nuclide chart [1]. By employing recent observational constraints on the neutron star mass, a universal RNEDF has been established that simultaneously describes the properties of finite nuclei and neutron star...

background: miniature neutron sources with high neutron flux have abundant applications in medicine, industry and researches. the most important general characteristic of miniature neutron sources is their diameter which is 3mm in average. in this research, we have surveyed and designed an am-be miniature neutron source fabrication. materials and methods: this investigation resulted in creation...

We examine how the properties of inhomogeneous nuclear matter at subnuclear densities depend on the density dependence of the symmetry energy. We focus on a parameter that characterizes the density dependence of the symmetry energy S(n) at about nuclear density n0. It is the density symmetry coefficient L = 3n0(dS/dn)n=n0 . From the saturation properties of stable nuclei, we find that the usual...

where kD=1.602 10 Gy⋅g/MeV — energy conversion factor from MeV to Gy×g, (obtained from the known ratio: 1 MeV=1.602 10 J); Е – neutron energy, MeV; Ф(r,Е) dE – neutron flux in the point r on the energy interval dE, neutron/cm/s: ni – atomic density of the i-th nuclide of the medium, atom/cm; σij(E) –microscopic cross-section of reaction j at interaction of a neutron with energy Е on the i-th nu...

The cooling of neutron stars by URCA processes in the kaon-condensed neutron star matter for various forms of nuclear symmetry energy is investigated. The kaonnucleon interactions are described by a chiral lagrangian. Nuclear matter energy is parametrized in terms of the isoscalar contribution and the nuclear symmetry energy in the isovector sector. High density behaviour of nuclear symmetry en...

The transition density ρt and pressure Pt at the inner edge separating the liquid core from the solid crust of neutron stars are systematically studied using a modified Gogny (MDI) and 47 popular Skyrme interactions within well established dynamical and thermodynamical methods. First of all, it is shown that the widely used parabolic approximation to the full Equation of State (EOS) of isospin ...

We analyzed the power density spectra of a sample of 9 neutron star and 9 black hole binaries in the low/hard spectral state. In the power density spectra of accreting neutron stars with a weak magnetic field a significant power is contained at frequencies close to one kHz. At the same time, most Galactic accreting black holes demonstrate a strong decline in the power spectra at the frequencies...

An effective equation of state which generalizes the Lattimer-Swesty equation for nuclear matter is presented for matter at supernuclear densities including strange baryons. It contains an adjustable baryon potential energy density, based on models of local potentials for the baryon-baryon interactions. The features of the equation rely on the properties of nuclei for the nucleon-nucleon intera...