1,062 research outputs found
Decision Support System for Urbanization of the Northern Part of the Volga-Akhtuba Floodplain (Russia) on the Basis of Interdisciplinary Computer Modeling
There is a computer decision support system (CDSS) for urbanization of the
northern part of the Volga-Akhtuba floodplain. This system includes subsystems
of cognitive and game-theoretic analysis, geoinformation and hydrodynamic
simulations. The paper presents the cognitive graph, two-level and three-level
models of hierarchical games for the cases of uncontrolled and controlled
development of the problem situation. We described the quantitative analysis of
the effects of different strategies for the spatial distribution of the
urbanized territories. For this reason we conducted the territory zoning
according to the level of negative consequences of urbanization for various
agents. In addition, we found an analytical solution for games with the linear
dependence of the average flooded area on the urbanized area. We numerically
computed a game equilibrium for dependences derived from the imitational
geoinformation and hydrodynamic modeling of flooding. As the result, we showed
that the transition to the three-level management system and the implementation
of an optimal urbanization strategy minimize its negative consequences.Comment: 14 pages, 5 figures; Conference: Creativity in Intelligent
Technologies and Data Science. CIT&DS 201
Gravitational resonance spectroscopy with an oscillating magnetic field gradient in the GRANIT flow through arrangement
Gravitational resonance spectroscopy consists in measuring the energy
spectrum of bouncing ultracold neutrons above a mirror by inducing resonant
transitions between different discrete quantum levels. We discuss how to induce
the resonances with a flow through arrangement in the GRANIT spectrometer,
excited by an oscillating magnetic field gradient. The spectroscopy could be
realized in two distinct modes (so called DC and AC) using the same device to
produce the magnetic excitation. We present calculations demonstrating the
feasibility of the newly proposed AC mode
Quantum reflection of antihydrogen from nanoporous media
We study quantum reflection of antihydrogen atoms from nanoporous media due
to the Casimir-Polder (CP) potential. Using a simple effective medium model, we
show a dramatic increase of the probability of quantum reflection of
antihydrogen atoms if the porosity of the medium increases. We discuss the
limiting case of reflections at small energies, which have interesting
applications for trapping and guiding antihydrogen using material walls
A New Constraint for the Coupling of Axion-like particles to Matter via Ultra-Cold Neutron Gravitational Experiments
We present a new constraint for the axion monopole-dipole coupling in the
range of 1 micrometer to a few millimeters, previously unavailable for
experimental study. The constraint was obtained using our recent results on the
observation of neutron quantum states in the Earth's gravitational field. We
exploit the ultimate sensitivity of ultra-cold neutrons (UCN) in the lowest
gravitational states above a material surface to any additional interaction
between the UCN and the matter, if the characteristic interaction range is
within the mentioned domain. In particular, we find that the upper limit for
the axion monopole-dipole coupling constant is (g_p g_s)/(\hbar c)<2 x 10^{-15}
for the axion mass in the ``promising'' axion mass region of ~1 meV.Comment: 5 pages 3 figure
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