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...

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...

The study of differential equations is useful in to analyze the possible past or future with help of present information. In this paper, the behavior of solutions has been analyzed around the equilibrium points for Gause model. Finally, some results are worked out to exist the stable periodic orbit for mentioned predator-prey system.

abstract background involvement of lacrimal apparatus by non hodgkin lymphoma as a first manifestation is extremely rare and only three cases have been reported in children. the purpose of this report is to determine the clinical characteristic of patient with primary involvement of lacrimal apparatus with lymphoma. case presentation a 7-year-old girl with history of tearing, gradually progress...