the problem of relative motion control for spacecraft formation flying in eccentric orbits is considered in this paper. due to the presence of nonlinear dynamics and external disturbances, a robust fuzzy sliding mode controller is developed. the slopes of sliding surfaces of the conventional sliding mode controller are tuned according to error states using a fuzzy logic and reach the pre-define...

New growth of extraocular muscle has been demonstrated in degenerating peripheral nerve autografts implanted between two extraocular muscles. This suggests that extraocular muscle may be lengthened for therapeutic purposes if a suitable matrix can be found to support this new growth. Investigators of peripheral nerve regeneration have found that the basal lamina of freeze-killed skeletal muscle...

SUMMER 2008 BETA 31 Trauma : “I can’t remember anything after the first few words she said: ‘I’m sorry to tell you that your test results came back positive.’ After that, it was all just a blur of sounds and images—the traffic outside, my heart beating, the look on her face. Everything was moving in slow motion. I just kept hearing those five words echoing in my head: ‘Your test came back posit...

The formation of planetesimals is investigated by studying the transport of dust particles in a local threedimensional simulation of accretion disc turbulence. Heavy particles fall rapidly towards themidplane,whereas lighter particles are strongly advected by the flow. For light particles the turbulence leads to a rapid redistribution of particles such that their density per unit mass is approx...

This paper discusses several algorithmic ways of constructing integrable evolution equations based on Lie algebraic structure. We derive, in a pedagogical style, a large class of two component peakon type dual systems from their two component soliton equations counter part. We study the essential aspects of Hamiltonian flows on coadjoint orbits of the centrally extended semidirect product group...

Nearly-circular Frozen Orbits (FOs) around axisymmetric bodies – or, quasi-circular Periodic (POs) non-axisymmetric are of primary concern in the design low-altitude survey missions. Here, we study very orbits (down to 50 km) a high-degree and order model Martian gravity field. We apply Prony’s Frequency Analysis (FA) characterize time variation their orbital elements by computing accurate quas...

Extrasolar planets as light as a few Earths are now being detected. Such planets are likely not gas or ice giants. Here, we present a study on the possible properties of the small and cold extrasolar planets, applied to the case of the recently discovered planet OGLE-2005-BLG-390Lb (Beaulieu et al. 2006). This planet (5.5 −2.7 Earth masses) orbits 2.6 +1.5 −0.6-astronomical units away from an o...