The optimization problem mixes discrete variables (selected planets, number of revolutions between two successive fly-bys, number of propelled maneuvers) and continuous variables (fly-bys dates, maneuver dates, magnitudes and orientations).
This article was reviewed by Pierre Antoine Pontarotti, Michael T. Ghiselin (nominated by Dr. Juergen Brosius) and Emanuel Tannenboum (nominated by Dr. Doron Lancet) The Universe consists of discrete entities: elementary particles, atoms, molecules, planets, stars, galaxies.
For the first decade of the 21st century, fares fell so low (£152 return from London to Boston; £359 to Christchurch in New Zealand) that you could sensibly take in the wonders of the planet in a sequence of discrete trips.
We have a discrete amount of material resources on the planet, even though some of them are renewable.
At residential colleges, rape occurs within a discrete institutional context, and it's within this context ("Planet College") that the media-savvy feminists exemplified by Sulkowicz have sparked a wave of activism that continues to generate administrative and social consternation.
We show that once in a stagnant-lid mode, a planet thus might preferentially evolve by temporally discrete global overturn events rather than by a continuous recycling of lid.
Just as every item of equipment and person in the U.S. military has a discrete Internet address, which can be monitored real-time through satellite networks that can reach everywhere on the planet, such will eventually be the case for every transit point, electric power station and commercial sit on the planet.
In this study the gravitational perturbations of the Sun and other planets are modeled on the dynamics near the Earth Moon Lagrange points and optimal continuous and discrete station-keeping maneuvers are found to maintain spacecraft about these points.
