The present investigation deals with the bulk arrival M/G/1 retrial queue with impatient customers and modified vacation policy. The incoming customers join the virtual pool of customers called orbit if they find the server being busy, on vacation or in broken down state otherwise the service of the customer at the head of the batch is started by the server. The service is provided in k</em...

The new prooles of the space missions aimed at asteroids and comets, moving from y{bys to rendez{ vous and orbiting, call for new spaceeight dynamics tools capable of propagating orbits in an accurate way around these small irregular objects. Moreover, interesting celestial mechanics and planetary science problems, requiring the same sophisticated tools, have been raised by the rst images of as...

This paper presents a set of linearized equations was derived for the motion, relative to an elliptical reference orbit, of an object influenced by J2 perturbation terms. Approximate solution for simulations was used to compare these equations and the linearized keplerian equations to the exact equations. The inclusion of the linearized perturbations in the derived equations increased the high ...

purpose : to report a patient with orbital tuberculosis (tb) without any history of systemic involvement case report : a 41-year-old afghani man who presented with progressive painless swelling in lateral side of the left upper eyelid and diplopia. he did not have history of fever or pulmonary disease. histopathology revealed a granulomatous inflammation with caseation necrosis. microbiological...

purpose : we describe clinical and radiologic findings and surgical outcome of an orbital dermoid cyst located in the superior oblique muscle tendon. this unusual location for dermoid tumors has not been reported previously. case report : a 15-year-old girl referred to us with an orbital mass in superonasal quadrant of the left orbit reportedly to be present from birth. computed tomography reve...

We present the first comparison of multiple global simulations solar wind interaction with Mercury’s dayside magnetosphere, conducted in framework international collaborative project SHOTS - Studies on Hermean magnetosphere Oriented Theories and Simulations. Two 3D magnetohydrodynamic two hybrid simulation codes are used to investigate response without its exosphere a northward-oriented interpl...

9 [1] We present results from a Rice Convection Model simulation of the early expansion 10 phase of a substorm that occurred 22 July 1998. The theoretical basis of the simulation 11 is the idea that the plasma injected into the inner magnetosphere during a substorm 12 primarily consists of a low-content plasma bubble, which is made up of flux tubes with 13 lower values of the entropy parameter ...

Abstract Explosive data rate requirements in the satellite communication for surveillance, military services, and broadcasting have put peer pressure on optical wireless (OWC) systems. Secure transmission against eavesdropper performance enhancement at authentic user is major concern these days. In this work, security analysis of spectral amplitude codes (SAC) mode division multiplexed (MDM) OW...