Martin W. Lo

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In this paper we apply dynamical systems techniques to the problem of heteroclinic connections and resonance transitions in the planar circular restricted three-body problem. These related phenomena have been of concern for some time in topics such as the capture of comets and asteroids and with the design of trajectories for space missions such as the(More)
There has recently been considerable interest in sending a spacecraft to orbit Europa, the smallest of the four Galilean moons of Jupiter. The trajectory design involved in effecting a capture by Europa presents formidable challenges to traditional conic analysis since the regimes of motion involved depend heavily on three-body dynamics. New three-body(More)
This paper concerns heteroclinic connections and resonance transitions in the planar circular restricted 3-body problem, with applications to the dynamics of comets and asteroids and the design of space missions such as the Genesis Discovery Mission and low energy Earth to Moon transfers. The existence of a heteroclinic connection between pairs of equal(More)
The invariant manifold structures of the collinear libration points for the restricted three-body problem provide the framework for understanding transport phenomena from a geometrical point of view. In particular, the stable and unstable invariant manifold tubes associated with libration point orbits are the phase space conduits transporting material(More)
This paper addresses the computation of the required trajectory correction maneuvers for a halo orbit space mission to compensate for the launch velocity errors introduced by inaccuracies of the launch vehicle. By combining dynamical systems theory with optimal control techniques, we are able to provide a compelling portrait of the complex landscape of the(More)
Healthy male volunteers (N = 24) participated in a four-way crossover study to compare the rate and extent of absorption of naltrexone after administration of 50 mg tablets as 50, 100, and 200 mg doses and a 10 mg/ml reference syrup. A high-performance liquid chromatographic method was employed to measure naltrexone and 6-beta-naltrexol in plasma and urine.(More)
We combine the techniques of almost invariant sets (using tree structured box elimination and graph partitioning algorithms) with invariant manifold and lobe dynamics techniques. The result is a new computational technique for computing key dynamical features, including almost invariant sets, resonance regions as well as transport rates and bottlenecks(More)
The invariant manifold structures of the collinear libration points for the spatial restricted three-body problem provide the framework for understanding complex dynamical phenomena from a geometric point of view. In particular, the stable and unstable invariant manifold " tubes " associated to libration point orbits are the phase space structures that(More)
In 1991, the Japanese Hiten mission used a low energy transfer with a ballistic capture at the Moon which required less V than a standard Hohmann transfer. In this paper , we apply the dynamical systems techniques developed in our earlier work to reproduce systematically a Hiten-like mission. We approximate the Sun-Earth-Moon-spacecraft 4-body system as two(More)
Genesis will be NASA's rst robotic sample return mission. The purpose of this mission is to collect solar wind samples for two y ears in an L 1 halo orbit and return them to the Utah Test and Training Range UTTR for mid-air retrieval by helicopters. To do this, the Genesis spacecraft makes an excursion into the region around L 2. This transfer between L 1(More)