6,035 research outputs found
Formulation of consumables management models. Volume 1: Mission planning
Development of an STS (Space Transportation System) interactive computer program MPP (Mission Planning Processor) working model was conducted. A summary of the computer program development and those supporting tasks conducted is presented. Development of the MPP Computer Program is discussed. This development was supported by several parallel tasks. These tasks either directly supported the program development, or provided information for future application and/or modification to the program in relation to the flight planning and flight operations of the STS and advanced spacecraft. The supporting tasks also included development of a Space Station MPP to demonstrate the applicability of the analytical methods developed under this RTOP to more advanced spacecraft than the STS
Layered Quantum Hall Insulators with Ultracold Atoms
We consider a generalization of the 2-dimensional (2D) quantum-Hall insulator
to a non-compact, non-Abelian gauge group, the Heisenberg-Weyl group. We show
that this kind of insulator is actually a layered 3D insulator with nontrivial
topology. We further show that nontrivial combinations of quantized transverse
conductivities can be engineered with the help of a staggered potential. We
investigate the robustness and topological nature of this conductivity and
connect it to the surface modes of the system. We also propose a simple
experimental realization with ultracold atoms in 3D confined to a 2D square
lattice with the third dimension being mapped to a gauge coordinate.Comment: 6 page
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