69,686 research outputs found
Radiological control procedures applicable to radioisotope thermoelectric generator SNAP-27. Volume 1 - Normal operations
Radiological control procedures applicable to transport, handling, and storage of the thermoelectric generator SNAP 27 prior to launch during normal condition
Holographic non-computers
We introduce the notion of holographic non-computer as a system which
exhibits parametrically large delays in the growth of complexity, as calculated
within the Complexity-Action proposal. Some known examples of this behavior
include extremal black holes and near-extremal hyperbolic black holes. Generic
black holes in higher-dimensional gravity also show non-computing features.
Within the expansion of General Relativity, we show that large-
scalings which capture the qualitative features of complexity, such as a linear
growth regime and a plateau at exponentially long times, also exhibit an
initial computational delay proportional to . While consistent for large AdS
black holes, the required `non-computing' scalings are incompatible with
thermodynamic stability for Schwarzschild black holes, unless they are tightly
caged.Comment: 23 pages, 7 figures. V3: References added. Figures updated. New
discussion of small black holes in the canonical ensembl
Radiological control procedures applicable to radioisotope thermoelectric generator SNAP-27. Volume 2 - Radiological emergencies
Radiological control procedures for transportation, handling, and storage of SNAP 27 thermoelectric generator in radiological emergencie
Exact and approximate symmetries for light propagation equations with higher order nonlinearity
For the first time exact analytical solutions to the eikonal equations in
(1+1) dimensions with a refractive index being a saturated function of
intensity are constructed. It is demonstrated that the solutions exhibit
collapse; an explicit analytical expression for the self-focusing position,
where the intensity tends to infinity, is found. Based on an approximated Lie
symmetry group, solutions to the eikonal equations with arbitrary nonlinear
refractive index are constructed. Comparison between exact and approximate
solutions is presented. Approximate solutions to the nonlinear Schrodinger
equation in (1+2) dimensions with arbitrary refractive index and initial
intensity distribution are obtained. A particular case of refractive index
consisting of Kerr refraction and multiphoton ionization is considered. It is
demonstrated that the beam collapse can take place not only at the beam axis
but also in an off-axis ring region around it. An analytical condition
distinguishing these two cases is obtained and explicit formula for the
self-focusing position is presented.Comment: 25 pages, 5 figure
Edge and waveguide THz surface plasmon modes in graphene micro-ribbons
Surface plasmon modes supported by graphene ribbon waveguides are studied and
classified. The properties of both modes with the field concentration within
the ribbon area (waveguiding modes) and on the edges (edge modes) are
discussed. The waveguide and edge modes are shown to be separated from each
other by a gap in wavenumbers. The even-parity hybridized edge mode results to
be the fundamental electromagnetic mode of the ribbon, possessing also the
lowest losses. All the plasmonic modes in the ribbons have an optimum
frequency, at which the absorption losses are minimum, due to competition
between the plasmon confinement and the frequency dependence of absorption in
graphene.Comment: 4 pages, 4 figure
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