We perform numerical simulations to study the secular orbital evolution and dynamical structure in the HD 69830 planetary system with the best-fit orbital solutions by Lovis and coworkers (2006). In the simulations, we show that the triplet Neptunian system can be stable at least for 2 Gyr and the stability would not be greatly influenced even if we vary the planetary masses from Neptune-mass t...

purpose: to report a known case of leprosy with bilateral corneal scars. case report: we present a 70 year-old man who had developed claw hand deformity and loss of sensation in the extremities secondary to leprosy since 7 years ago. two years ago, he presented with loss of vision due to lagopthalmos and loss of corneal sensation for which he had undergone lateral tarsorrhaphy at the time. conc...

A long time ago, since the launch of the first artificial satellite in 1957, controling attitude of satellites has been considered by the designers and engineers of aerospace industry. Considering the importance of this issue various methods of control in response to this need have been presented and analyzed until now. In this paper, we propose and analyze a three-axis optimal control on the s...

In binary radio pulsars with a main-sequence star companion, the spin-induced quadrupole moment of the companion gives rise to a precession of the binary orbit. As a first approximation one can model the secular evolution caused by this classical spin-orbit coupling by linear-in-time changes of the longitude of periastron and the projected semi-major axis of the pulsar orbit. This simple repres...

The historical record of aurorae is continuous and usefully dense for at least the last 2000 years. Revival of interest in the secular variability in solar activity motivates a review of the auroral record. The existence of secular variations in the auroral occurrence frequency has been known since the early 1700's, including the existence of a significant attenuation of auroral activity during...