Based on quantum hydrodynamics theory (QHD), the propagation of nonlinear quantum dust-ion acoustic (QDIA) solitary waves in a ‎collision-less, unmagnetized four component quantum plasma consisting of electrons, positrons, ions and stationary negatively charged ‎dust grains with dust charge variation is investigated using reductive perturbation method. The charging current to the dust grains ca...

satellite orbit determination is a method of determining the state vector, i.e., position and velocity, of a low earth orbiting (leo) satellite or interplanetary spacecraft. during the past two decades, many satellites with various applications including geodetic applications have been launched at low altitudes. for instance, topex / poseidon, champ, grace and goce are the examples of the geode...

By orbit-limited motion (OLM) theory and the kinetic model, currents carried by electronsand ions on the dust grain are obtained and the effects of temperature and drift velocity of ions on thedust grain electrical potential are considered. The calculations were performed for finding the role of densities of dust grains and ions on the dust grain electrical potential which is the ma...

The purpose of this rersearch is to analyze the effective application of particular earth orbits in dynamical modeling of relative motion problem between two spacecraft. One challenge in implementing these motions is maintaining the relations as it experiences orbital perturbations (zonal harmonics J2 and J3), most notably due to the Earth’s oblateness. Certain aspects of the orbital geometry c...

We discuss an extension of the theory of spin-orbit pendulum phenomenon given in [1] to relativistic approach. It is done within the so called Dirac Oscillator. Our first results, focusing on circular wave packet motion have been published recently [2]. The scope of this paper is motion of a linear wave packet. In relativistic approach we found Zitterbewegung in spin-orbit motion (in Dirac repr...

department of islamic philosophy and wisdom, zanjan university bringing up the ancients’ views and asking about their ultimate condition in mullā ṣadrā’s thinking and that of his disciples has had a significant impact on the formation and development of the motion theory. mentioning the names and bringing up the views of the ancient greek philosophers, as evidences for truthfulness in the disco...

In a recent Letter [1], Hauff et al. state [see also Eq. (3) therein] without proof that the condition for the validity of orbit averaging is that the orbital time of the equilibrium periodic motion is shorter than the time for the perpendicular drift across a turbulence eddy by either the turbulence E B drift or the equilibrium magnetic drift. The authors further state that the equilibrium mag...