Studies of nanosize(5 - 30 nm) island formation of Fe and Cr silicides on Si(111) 7×7 and Si(100) 2×1 surfaces,silicon growth atop nanosize silicide islands and multilayer repetition of developed growth proc...
Studies of nanosize(5 - 30 nm) island formation of Fe and Cr silicides on Si(111) 7×7 and Si(100) 2×1 surfaces,silicon growth atop nanosize silicide islands and multilayer repetition of developed growth procedure for all silicides have been carried *** of growth parameters has permitted to create monolithic multilayer heteronanostructures with buried nanocrystals(NC) of iron and chromium *** was firstly shown thatβ-FeSiiand CrSi NC(5 -30 nm) are elastically embedded in silicon lattice due to introduction of tension in the NC lattice and silicon lattice around NC without formation of misfit dislocations on the *** properties and electrical properties of multilayer heteronanostructures have been studied and device perspectives have been discussed.
The transmission of light by spicules of marine glass sponges and monolithic nanocomposite silica biomaterials synthesized on the basis of natural polysaccharides has been experimentally *** researches have shown that...
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The transmission of light by spicules of marine glass sponges and monolithic nanocomposite silica biomaterials synthesized on the basis of natural polysaccharides has been experimentally *** researches have shown that the core diameter and cladding layers thickness of the spicules of glass sponges are appropriate to cause photonic *** enables singlemode waveguide and Bragg light propagation regimes in the *** strong non-linear optical properties of glass sponges and nanocomposite silica biomaterials have been revealed in spectral characteristics of transmitted ultra-short laser *** shape of transmitted spectrums through both spicules and nanocomposite biomaterials demonstrates major changes indicating the broadening and formation of dip due to self-phase modulation along with formation markedly strong anti-Stokes component in the output spectrum with generation of supercontinuum spectra.
The paper presents the tuning method of digital PID-controllers based on the solution of parametric optimization problem under uncertain process model and given power spectrum densities (PSD) of stochastic disturbance...
The paper presents the tuning method of digital PID-controllers based on the solution of parametric optimization problem under uncertain process model and given power spectrum densities (PSD) of stochastic disturbance and set point signals. The new approach for determination of set of stabilizing PID values is issued. It was used in the optimization procedure in order to check closed loop stability conditions during the search iterations.
The paper discusses tomography reconstruction of distributed physical fields. The problem is shown to be solved by using distributed measuring networks based on optical fibre sensors. Special attention is paid to tomo...
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Work is devoted of development of predictive method of trajectory planning of a vectored thruster underwater vehicle. The specified underwater vehicle has the limited manoeuvrability, therefore for more effective perf...
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ISBN:
(纸本)9781424424948
Work is devoted of development of predictive method of trajectory planning of a vectored thruster underwater vehicle. The specified underwater vehicle has the limited manoeuvrability, therefore for more effective performance of underwater works it is necessary to know in advance orientation from which it is necessary to arrive in a target point. This problem is solved by means of a neural network which predicts possible position of the next target point. As a result, using the received information, it is possible so to plan a movement trajectory, that the vectored thruster underwater vehicle can move on more difficult spatial trajectories with higher speed.
The behavior of the velocity vorticity vector on a discontinuity surface arising in the supersonic non-uniform flow of combustible gas around a body with the formation of a shock or detonation wave is studied. The fre...
The behavior of the velocity vorticity vector on a discontinuity surface arising in the supersonic non-uniform flow of combustible gas around a body with the formation of a shock or detonation wave is studied. The free stream is generally vortical and has a given distribution of parameters. The formulas are obtained for the vorticity vector components in a special coordinate system related to the wave. It is shown that in this case the vorticity vector normal to the wave remains continuous across the discontinuity surface, and in the case of axisymmetric flows, also the quantity remains continuous, which is equal to the ratio of the tangent vorticity component to density, although the quantities themselves taken separately undergo a discontinuity.
Composition, electron density and morphology of metal thin-film nanophases were studied by AES, EELS, AFM and conductivity measurements during MBE deposition of Fe and Co on Si(100) and (111), respectively. AES data d...
Composition, electron density and morphology of metal thin-film nanophases were studied by AES, EELS, AFM and conductivity measurements during MBE deposition of Fe and Co on Si(100) and (111), respectively. AES data demonstrated a layer by layer growth of Fe with a segregation of submonolayer coverage of Si at T = 20 °C and, after annealing at T = 250 °C, a fixed and increased value of the Si-to-Fe Auger-peak ratio in the ranges of d = 0.03−0.12 or 1.2 nm and 0.3−0.6 nm, respectively. EELS spectra indicated a redistribution of valence electrons at the Fe/ Si(100) interface at d = 0.03−0.12 nm. With further increase of Fe thickness, EELS spectra showed transitions to Fe nanophases with lowered concentration of valence electrons near d = 0.12−0.3 nm and d = 0.6−1.2 nm. After annealing AFM images showed the relief stability of stepped Si(100) surface in the range of d = 0.03−0.3 nm, the disappearance of the stepped relief type after 0.3 nm and formation ridge-like islands in Fe film at d = 1.2 nm. Auger peak intensity and conductivity versus the thickness for nanophases of Co on Si(111) showed variations of growth mechanism in accordance with variations of interface layer state.
In the article are given the results of the researches of the glass sea sponges Hyalonema sieboldi and Ferronema sp. spicules as new object of nano-photonics. The distribution of refractive index over the cross sectio...
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