636 research outputs found
Real-Time Expert System for Control of Electrophysical Complex
This work is the continuation of research in the field of a real-time expert system (RTES) prototype for control electrophysical complex (EC) [1,2]. The work was realized with the Gensymâs G2 (USA), development environment for creating and deploying intelligent realtime application. The main goal was the modernization of the previous RTES version by adding new subsystems in the scope of the existing features. This became possible thanks to the new technologies of dynamic expert system. In particular the problem-oriented G2-based product such as G2 Diagnostic Assistant (GDA) was used. It must be noticed that RTES is oriented to wide range of specialists in the ECâs area. All of them have different experience not onl
Intelligent Programm Support for Dynamic Integrated Expert Systems Construction
AbstractThe problems of intellectualization in the development process of integrated expert systems basing on the the problem-oriented methodology and the AT-TECHNOLOGY workbench are considered. The automation of dynamic integrated expert systems construciton is in focus. The intellgient programm environment and its basic components, including standard design procedure are reviewed. The detailed description of procedure for dynamic integrated expert system construction is given. The examples of applied integrated expert system prototypes developed with described procedure are listed
Nonlinear interaction of light with Bose-Einstein condensate: new methods to generate subpoissonian light
We consider -type model of the Bose-Einstein condensate of sodium
atoms interacting with the light. Coefficients of the Kerr-nonlinearity in the
condensate can achieve large and negative values providing the possibility for
effective control of group velocity and dispersion of the probe pulse. We find
a regime when the observation of the "slow" and "fast" light propagating
without absorption becomes achievable due to strong nonlinearity. An effective
two-level quantum model of the system is derived and studied based on the su(2)
polynomial deformation approach. We propose an efficient way for generation of
subpoissonian fields in the Bose-Einstein condensate at time-scales much
shorter than the characteristic decay time in the system. We show that the
quantum properties of the probe pulse can be controlled in BEC by the classical
coupling field.Comment: 13 pages, 6 figures, 1 tabl
Formation of the internal structure of solids under severe action
On the example of a particular problem, the theory of vacancies, a new form
of kinetic equations symmetrically incorporation the internal and free energies
has been derived. The dynamical nature of irreversible phenomena at formation
and motion of defects (dislocations) has been analyzed by a computer
experiment. The obtained particular results are extended into a thermodynamic
identity involving the law of conservation of energy at interaction with an
environment (the 1st law of thermodynamics) and the law of energy
transformation into internal degree of freedom (relaxation). The identity is
compared with the analogous Jarzynski identity. The approach is illustrated by
simulation of processes during severe plastic deformation, the Rybin kinetic
equation for this case has been derived.Comment: 9 pages, 5 figure
Exact solution, scaling behaviour and quantum dynamics of a model of an atom-molecule Bose-Einstein condensate
We study the exact solution for a two-mode model describing coherent coupling
between atomic and molecular Bose-Einstein condensates (BEC), in the context of
the Bethe ansatz. By combining an asymptotic and numerical analysis, we
identify the scaling behaviour of the model and determine the zero temperature
expectation value for the coherence and average atomic occupation. The
threshold coupling for production of the molecular BEC is identified as the
point at which the energy gap is minimum. Our numerical results indicate a
parity effect for the energy gap between ground and first excited state
depending on whether the total atomic number is odd or even. The numerical
calculations for the quantum dynamics reveals a smooth transition from the
atomic to the molecular BEC.Comment: 5 pages, 4 figure
Fano Resonance Between Mie and Bragg Scattering in Photonic Crystals
We report the observation of a Fano resonance between continuum Mie
scattering and a narrow Bragg band in synthetic opal photonic crystals. The
resonance leads to a transmission spectrum exhibiting a Bragg dip with an
asymmetric profile, which can be tunably reversed to a Bragg rise. The Fano
asymmetry parameter is linked with the dielectric contrast between the
permittivity of the filler and the specific value determined by the opal
matrix. The existence of the Fano resonance is directly related to disorder due
to non-uniformity of a-SiO2 opal spheres. Proposed theoretical "quasi-3D" model
produces results in excellent agreement with the experimental data
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Deep and extensive meltwater system beneath the former Eurasian Ice Sheet in the Kara Sea
Abstract
The Eurasian ice sheet extended across the Barents and Kara Seas during the late Quaternary, yet evidence on past ice dynamics and thermal structure across its huge eastern periphery remains largely unknown. Here we use three-dimensional seismic data sets covering âŒ4500 km2 of the Kara Sea west of Yamal Peninsula, Siberia (71°â73°N), to identify, for the first time in the Russian Arctic seas, several buried generations of vast subglacial tunnel valley networks. Individual valleys are up to 50 km long and are incised as much as 400 m deep; among the largest tunnel valleys ever reported. This discovery represents the first documentation of an extensively warm-based eastern margin of the Eurasian ice sheet during the Quaternary glaciations. The presence of major subglacial channel networks on the shallow shelf, with no evidence of ice streaming, suggests that significant meltwater discharge and subsequent freshwater forcing of ocean circulation may be long-lived rather than catastrophic, occurring during the latest stages of deglaciation in areas where the ice sheet flows slowly and is grounded largely above sea level. Furthermore, the first account of an extensive hydrological network across large areas of the Kara Sea provides important empirical evidence for active subglacial hydrological processes that should be considered in future numerical modeling of the eastern margin of the Quaternary Eurasian ice sheet.</jats:p
Fabrication of submicron structures by three-dimensional laser lithography
As a demonstration of unique capabilities of three dimensional laser lithography, an example complex shape
microobject and photonic crystals with âwoodpileâ structure for the infrared spectral range are fabricated by
this technique. Photonic dispersion relations for the woodpile structure are calculated for different values of
the permittivity contrast and the filling factor.This study was partially supported by the
Government of the Russian Federation (project no.
074U01) and the Russian Foundation for Basic
Research (project no. 130200186)
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