17 research outputs found
Physical research of microgravity influence on physical phenomenon in cryogenic liquids and general-purpose onboard cryogenic facility for realization of this researchaboard International Space Station
The united research plan named "Boiling" is created on the basis of several cryogenic research projects developed by experts in Russia and Ukraine for International Space Station. The "Boiling" plan includes 8 first experiments aimed at investigating the influence of microgravity on boiling processes, heat transfer and hydrodynamics in liquid helium being either under normal or superfluid conditions. The experiments are supposed to be carried out with individual cells collected inside a single cryogenic onboard experimental facility. The international research program experiments are characterized by the following features: utilization of several artificially simulated microgravity levels, owing to rotation of the experimental helium cryostat; visualization of the processes that occur in liquid helium; research of boiling and hydrodynamics both in a large volume of stationary liquid, and in a liquid flow running through a channel. Upon completion of the "Boiling" research plan, the cryogenic onboard facility created for International Space Station would be able to find its application in further scientific and experimental researches with helium
Research of the passage of mode pulses in a waveguide with a one-dimensional diffractiongrade
Π Π΄Π°Π½Π½ΠΎΠΉ ΡΡΠ°ΡΡΠ΅ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΎ ΠΌΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ ΠΏΡΠΎΡ
ΠΎΠΆΠ΄Π΅Π½ΠΈΡ ΠΌΠΎΠ΄ΠΎΠ²ΡΡ
ΠΈΠΌΠΏΡΠ»ΡΡΠΎΠ² Π² Π²ΠΎΠ»Π½ΠΎΠ²ΠΎΠ΄Π΅ Ρ ΠΎΠ΄Π½ΠΎΠΌΠ΅ΡΠ½ΠΎΠΉ ΡΠ΅ΡΠ΅ΡΠΊΠΎΠΉ. ΠΡΡΠ»Π΅Π΄ΡΠ΅ΡΡΡ Π΄ΠΈΡΡΠ°ΠΊΡΠΈΡ Π½Π΅ΠΏΡΠ΅ΡΡΠ²Π½ΠΎΠ³ΠΎ ΠΈΠ·Π»ΡΡΠ΅Π½ΠΈΡ ΠΈ ΠΊΠΎΡΠΎΡΠΊΠΎΠ³ΠΎ ΠΈΠΌΠΏΡΠ»ΡΡΠ° Π½Π° ΡΠ΅ΡΠ΅ΡΠΊΠ΅ Ρ ΠΏΠ΅ΡΠΈΠΎΠ΄ΠΎΠΌ ΠΏΠΎΡΡΠ΄ΠΊΠ° Π΄Π»ΠΈΠ½Ρ Π²ΠΎΠ»Π½Ρ Π² Π²ΠΎΠ»Π½ΠΎΠ²ΠΎΠ΄Π΅ Ρ ΠΎΡΡΠ°ΠΆΠ°ΡΡΠΈΠΌΠΈ ΡΡΠ΅Π½ΠΊΠ°ΠΌΠΈ. ΠΠΎΠΊΠ°Π·Π°Π½Π° Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΡ Π΄ΠΈΡΡΠ΅ΡΠ΅Π½ΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΎΡΡΠ°ΠΆΠ΅Π½Π½ΠΎΠ³ΠΎ ΠΊΠΎΡΠΎΡΠΊΠΎΠ³ΠΎ ΠΠ°ΡΡΡΠΎΠ²Π° ΠΈΠΌΠΏΡΠ»ΡΡΠ°. ΠΡΠΈΠ²ΠΎΠ΄ΡΡΡΡ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΌΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π΄Π»Ρ ΠΊΠΎΡΠΈΠ½ΡΡΠ½ΠΎΠ³ΠΎ ΡΠΈΠ³Π½Π°Π»Π° Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ ΠΌΠ΅ΡΠΎΠ΄Π° ΠΊΠΎΠ½Π΅ΡΠ½ΡΡ
ΡΠ°Π·Π½ΠΎΡΡΠ΅ΠΉ Π²ΠΎ Π²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠΉ ΠΎΠ±Π»Π°ΡΡΠΈ (FDTD) Π² ΡΠ²ΠΎΠ±ΠΎΠ΄Π½ΠΎ ΡΠ°ΡΠΏΡΠΎΡΡΡΠ°Π½ΡΠ΅ΠΌΠΎΠΌ ΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌΠ½ΠΎΠΌ ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠ΅Π½ΠΈΠΈ MEEP. In this paper, we simulate the propagation of mode pulses in a waveguide with a
one-dimensional lattice. The diffraction of continuous radiation and a short pulse on a grating with a period of wave processing in a waveguide with reflecting walls is investigated. The possibility of differentiating the reflected short Gaussian pulse is reported. Simulation results for the cosine signal are presented using the FDTD method in freely distributed MEEP software.Π Π°Π±ΠΎΡΠ° Π²ΡΠΏΠΎΠ»Π½Π΅Π½Π° ΠΏΡΠΈ ΠΏΠΎΠ΄Π΄Π΅ΡΠΆΠΊΠ΅ Π€Π΅Π΄Π΅ΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ Π°Π³Π΅Π½ΡΡΡΠ²Π° Π½Π°ΡΡΠ½ΡΡ
ΠΎΡΠ³Π°Π½ΠΈΠ·Π°ΡΠΈΠΉ (ΡΠΎΠ³Π»Π°ΡΠ΅Π½ΠΈΠ΅ No 007-ΠΠ/Π§3363/26)
Catastrophe theory and caustics of radially symmetric beams
Π Π°Π±ΠΎΡΠ° ΠΏΠΎΡΠ²ΡΡΠ΅Π½Π° ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΊΠ°ΡΡΡΠΈΠΊ ΡΠ°Π΄ΠΈΠ°Π»ΡΠ½ΡΡ
ΠΏΡΡΠΊΠΎΠ². ΠΠ°ΠΉΠ΄Π΅Π½Ρ Π°Π½Π°Π»ΠΈΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ Π²ΡΡΠ°ΠΆΠ΅Π½ΠΈΡ Π΄Π»Ρ ΠΊΠ°ΡΡΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠ΅ΠΉ Π²ΠΎΠ»Π½ΠΎΠ²ΡΡ
ΡΡΠΎΠ½ΡΠΎΠ², ΡΠΎΠ·Π΄Π°Π²Π°Π΅ΠΌΡΡ
ΡΠ°Π΄ΠΈΠ°Π»ΡΠ½ΠΎ-ΡΠΈΠΌΠΌΠ΅ΡΡΠΈΡΠ½ΡΠΌΠΈ Π΄ΠΈΡΡΠ°ΠΊΡΠΈΠΎΠ½Π½ΡΠΌΠΈ ΠΎΠΏΡΠΈΡΠ΅ΡΠΊΠΈΠΌΠΈ ΡΠ»Π΅ΠΌΠ΅Π½ΡΠ°ΠΌΠΈ. Π Π΅Π·ΡΠ»ΡΡΠ°Ρ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½ Π² ΠΊΡΠΈΠ²ΠΎΠ»ΠΈΠ½Π΅ΠΉΠ½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΠ΅ ΠΊΠΎΠΎΡΠ΄ΠΈΠ½Π°Ρ, ΡΠΎΠ³Π»Π°ΡΠΎΠ²Π°Π½Π½ΠΎΠΉ Ρ ΠΊΠ°ΡΡΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΡΡ. ΠΠΎΠ»ΡΡΠ΅Π½ΠΎ Π°ΡΠΈΠΌΠΏΡΠΎΡΠΈΡΠ΅ΡΠΊΠΎΠ΅ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½ΠΈΠ΅ ΠΈΠ½ΡΠ΅Π³ΡΠ°Π»Π° ΠΠΈΡΡ
Π³ΠΎΡΠ° Π²Π±Π»ΠΈΠ·ΠΈ ΠΎΠΏΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΎΡΠΈ, ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠΈΠ²Π°ΡΡΠ΅Π΅ ΠΊΠΎΡΡΠ΅ΠΊΡΠ½ΠΎΡΡΡ ΡΠ°ΡΡΠ΅ΡΠΎΠ² Π² Π½Π΅ΠΏΠ°ΡΠ°ΠΊΡΠΈΠ°Π»ΡΠ½ΠΎΠΌ ΡΠ»ΡΡΠ°Π΅. The work is devoted to the study of the caustics of radial beams. Analytical expressions for caustic surfaces of wave fronts created by radially symmetric diffractive optical elements are found. The result is presented in a curvilinear coordinate system consistent with the caustic surface. An asymptotic representation of the Kirchhoff integral near the optical axis is obtained, ensuring the correct calculations in the non-paraxial case.Π Π°Π±ΠΎΡΠ° Π²ΡΠΏΠΎΠ»Π½Π΅Π½Π° ΠΏΡΠΈ ΡΠΈΠ½Π°Π½ΡΠΎΠ²ΠΎΠΉ ΠΏΠΎΠ΄Π΄Π΅ΡΠΆΠΊΠ΅ Π ΠΎΡΡΠΈΠΉΡΠΊΠΎΠ³ΠΎ ΡΠΎΠ½Π΄Π° ΡΡΠ½Π΄Π°ΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ (Π³ΡΠ°Π½Ρ β 18-29-20045-ΠΌΠΊ) Π² ΡΠ°ΡΡΠΈ ΡΠΈΡΠ»Π΅Π½Π½ΠΎΠ³ΠΎ ΠΌΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΈ ΠΠΈΠ½ΠΈΡΡΠ΅ΡΡΡΠ²Π° Π½Π°ΡΠΊΠΈ ΠΈ Π²ΡΡΡΠ΅Π³ΠΎ ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΡ Π Π€ Π² ΡΠ°ΠΌΠΊΠ°Ρ
Π²ΡΠΏΠΎΠ»Π½Π΅Π½ΠΈΡ ΡΠ°Π±ΠΎΡ ΠΏΠΎ ΠΠΎΡΡΠ΄Π°ΡΡΡΠ²Π΅Π½Π½ΠΎΠΌΡ Π·Π°Π΄Π°Π½ΠΈΡ Π€ΠΠΠ¦ Β«ΠΡΠΈΡΡΠ°Π»Π»ΠΎΠ³ΡΠ°ΡΠΈΡ ΠΈ ΡΠΎΡΠΎΠ½ΠΈΠΊΠ°Β» Π ΠΠ (ΡΠΎΠ³Π»Π°ΡΠ΅Π½ΠΈΠ΅ β 007-ΠΠ/Π§3363/26) Π² ΡΠ°ΡΡΠΈ ΡΠ΅ΠΎΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠΈΡ
Π²ΡΠΊΠ»Π°Π΄ΠΎΠΊ
Modeling of arrangement tolerances for the optical elements in a spaceborne Offner imaging hyperspectrometer
ΠΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½ ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΠΉ Π°ΠΏΠΏΠ°ΡΠ°Ρ, ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½Ρ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΈΠ·ΠΎΠ±ΡΠ°ΠΆΠ΅Π½ΠΈΡ Π² ΠΏΠ»ΠΎΡΠΊΠΎΡΡΠΈ ΡΠ΅Π³ΠΈΡΡΡΠ°ΡΠΎΡΠ° Π³ΠΈΠΏΠ΅ΡΡΠΏΠ΅ΠΊΡΡΠΎΠΌΠ΅ΡΡΠ° ΠΏΠΎ ΡΡ
Π΅ΠΌΠ΅ ΠΡΡΠ½Π΅ΡΠ°, ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½Ρ ΡΡΠ»ΠΎΠ²Π½ΡΠ΅ Π΄ΠΎΠΏΡΡΠΊΠΈ Π½Π° ΠΏΠΎΠ»ΠΎΠΆΠ΅Π½ΠΈΠ΅ ΡΠ»Π΅ΠΌΠ΅Π½ΡΠΎΠ² ΡΠΏΠ΅ΠΊΡΡΠΎΠΌΠ΅ΡΡΠ°. Π Π΅Π·ΡΠ»ΡΡΠ°Ρ ΠΌΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠΎΠ²ΠΌΠ΅ΡΡΠ½ΠΎΠ³ΠΎ Π΄Π΅ΠΉΡΡΠ²ΠΈΡ ΠΏΠΎΠ³ΡΠ΅ΡΠ½ΠΎΡΡΠ΅ΠΉ ΠΏΠΎΠΊΠ°Π·Π°Π», ΡΡΠΎ Π²Π΅ΡΠΎΡΡΠ½ΠΎΡΡΡ ΡΠ΄Π°ΡΠ½ΠΎΠΉ ΡΠ±ΠΎΡΠΊΠΈ Π³ΠΈΠΏΠ΅ΡΡΠΏΠ΅ΠΊΡΡΠΎΠΌΠ΅ΡΡΠ° Ρ ΡΠΎΠ±Π»ΡΠ΄Π΅Π½ΠΈΠ΅ΠΌ ΡΡΠ΅Π±ΠΎΠ²Π°Π½ΠΈΠΉ ΠΏΠΎ ΠΊΠ°ΡΠ΅ΡΡΠ²Ρ ΠΈΠ·ΠΎΠ±ΡΠ°ΠΆΠ΅Π½ΠΈΡ Π±ΡΠ΄Π΅Ρ Π½Π΅ ΠΌΠ΅Π½ΡΡΠ΅ 0,9.Π Π°Π±ΠΎΡΠ° Π²ΡΠΏΠΎΠ»Π½Π΅Π½Π° ΠΏΡΠΈ ΡΠ°ΡΡΠΈΡΠ½ΠΎΠΉ ΠΏΠΎΠ΄Π΄Π΅ΡΠΆΠΊΠ΅ Π³ΡΠ°Π½ΡΠΎΠ² Π Π€Π€Π β 16-29-11744, β 16-29-09528 ΠΈ Π³ΠΎΡΡΠ΄Π°ΡΡΡΠ²Π΅Π½Π½ΠΎΠ³ΠΎ Π·Π°Π΄Π°Π½ΠΈΡ ΠΠ‘ΠΠ Π ΠΠ (ΡΠΎΠ³Π»Π°ΡΠ΅Π½ΠΈΠ΅
β 007-ΠΠ/43363/26)
Calculation of the band structure of a nonchiral semiconductor and metallic carbon nanotubes
Π ΡΠ°Π±ΠΎΡΠ΅ ΠΏΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½ Π½ΠΎΠ²ΡΠΉ ΡΠΎΡΠΌΠ°Π»ΠΈΠ·ΠΌ ΠΌΠ΅ΡΠΎΠ΄Π° Π»ΠΈΠ½Π΅Π°ΡΠΈΠ·ΠΎΠ²Π°Π½Π½ΡΡ
ΠΏΡΠΈΡΠΎΠ΅Π΄ΠΈΠ½Π΅Π½Π½ΡΡ
ΡΠΈΠ»ΠΈΠ½Π΄ΡΠΈΡΠ΅ΡΠΊΠΈΡ
Π²ΠΎΠ»Π½. ΠΠ»Ρ ΠΏΠΎΡΡΡΠΎΠ΅Π½ΠΈΡ Π±Π°Π·ΠΈΡΠ½ΡΡ
ΡΡΠ½ΠΊΡΠΈΠΉ ΡΠ»Π΅ΠΊΡΡΠΎΠ½Π½ΡΠΉ ΠΏΠΎΡΠ΅Π½ΡΠΈΠ°Π» Π±Π΅ΡΠ΅ΡΡΡ ΡΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠΈ ΡΠΈΠΌΠΌΠ΅ΡΡΠΈΡΠ½ΡΠΌ Π² Π°ΡΠΎΠΌΠ½ΡΡ
ΠΎΠ±Π»Π°ΡΡΡΡ
, ΠΏΠΎΡΡΠΎΡΠ½Π½ΡΠΌ Π² ΠΏΡΠΎΠΌΠ΅ΠΆΡΡΠΎΡΠ½ΠΎΠΉ ΠΎΠ±Π»Π°ΡΡΠΈ ΠΈ ΡΠΈΠ»ΠΈΠ½Π΄ΡΠΈΡΠ΅ΡΠΊΠΈ ΡΠΈΠΌΠΌΠ΅ΡΡΠΈΡΠ½ΡΠΌ Π² Π²Π°ΠΊΡΡΠΌΠ½ΡΡ
ΠΎΠ±Π»Π°ΡΡΡΡ
. ΠΠ°Π·ΠΈΡΠ½ΡΠ΅ ΡΡΠ½ΠΊΡΠΈΠΈ ΠΌΠ΅ΡΠΎΠ΄Π°, ΠΏΠΎΠ»ΡΡΠ°Π΅ΠΌΡΠ΅ ΠΈΠ· ΡΠ΅ΡΠ΅Π½ΠΈΡ ΡΠ°Π²Π½Π΅Π½ΠΈΡ Π¨ΡΠ΅Π΄ΠΈΠ½Π³Π΅ΡΠ° Π² ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΡΡΡΠΈΡ
ΠΎΠ±Π»Π°ΡΡΡΡ
, ΡΡΠΈΠ²Π°ΡΡΡΡ Π½Π° Π³ΡΠ°Π½ΠΈΡΠ°Ρ
ΠΠ’-ΡΡΠ΅Ρ ΠΈ ΡΠΈΠ»ΠΈΠ½Π΄ΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΡΡ
ΡΡΡΠ±ΠΊΠΈ, ΠΎΠ±ΡΠ°Π·ΡΡ Π²ΡΡΠ΄Ρ Π½Π΅ΠΏΡΠ΅ΡΡΠ²Π½ΡΠ΅ Π΄ΠΈΡΡΠ΅ΡΠ΅Π½ΡΠΈΡΡΠ΅ΠΌΡΠ΅ ΡΡΠ½ΠΊΡΠΈΠΈ. ΠΠ»Ρ Π°ΠΏΡΠΎΠ±Π°ΡΠΈΠΈ ΠΌΠ΅ΡΠΎΠ΄Π° Π±ΡΠ»ΠΈ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½Ρ ΡΠ°ΡΡΠ΅ΡΡ Π·ΠΎΠ½Π½ΠΎΠΉ ΡΡΡΡΠΊΡΡΡΡ Π½Π΅Ρ
ΠΈΡΠ°Π»ΡΠ½ΠΎΠΉ ΠΏΠΎΠ»ΡΠΏΡΠΎΠ²ΠΎΠ΄Π½ΠΈΠΊΠΎΠ²ΠΎΠΉ ΠΈ ΠΌΠ΅ΡΠ°Π»Π»ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΎΠ΄Π½ΠΎΡΡΠ΅Π½Π½ΡΡ
ΡΠ³Π»Π΅ΡΠΎΠ΄Π½ΡΡ
Π½Π°Π½ΠΎΡΡΡΠ±ΠΎΠΊ. We proposed a new formalism of the method of linearized attached cylindrical waves. For the construction of basis functions, the electron potential is taken to be spherically symmetric in atomic regions, constant in the intermediate region and cylindrically symmetric in the vacuum regions. The basic functions of the method, obtained from the solution of the SchrΓΆdinger equation in the corresponding domains, are sewn on the boundaries of the MT spheres and the cylindrical surfaces of the tube, forming everywhere continuous differentiable functions. For the approbation of the method, the band structure of the nonchiral semiconductor and metallic single-walled carbon nanotubes was calculated.Π Π°Π±ΠΎΡΠ° Π²ΡΠΏΠΎΠ»Π½Π΅Π½Π° ΠΏΡΠΈ ΠΏΠΎΠ΄Π΄Π΅ΡΠΆΠΊΠ΅ Π€Π΅Π΄Π΅ΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ Π°Π³Π΅Π½ΡΡΡΠ²Π° Π½Π°ΡΡΠ½ΡΡ
ΠΎΡΠ³Π°Π½ΠΈΠ·Π°ΡΠΈΠΉ (ΡΠΎΠ³Π»Π°ΡΠ΅Π½ΠΈΠ΅ No 007-ΠΠ/Π§3363/26) ΠΈ Π ΠΎΡΡΠΈΠΉΡΠΊΠΎΠ³ΠΎ ΡΠΎΠ½Π΄Π° ΡΡΠ½Π΄Π°ΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ (Π Π€Π€Π), Π³ΡΠ°Π½ΡΡ NoNo 16-29-09528, 16-29-11744
Simulation of the interaction of electrons and photons in grapheme in the strong coupling approaimation
Π ΡΠ°Π±ΠΎΡΠ΅ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½Π° Π°Π½Π°Π»ΠΎΠ³ΠΈΡ ΠΌΠ΅ΠΆΠ΄Ρ ΠΎΠΏΠΈΡΠ°Π½ΠΈΠ΅ΠΌ Π²Π·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΡ ΡΠΏΠΈΠ½Π° Π² ΠΏΠ΅ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠΌ ΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠΌ ΠΏΠΎΠ»Π΅ ΠΈ ΡΠ»Π΅ΠΊΡΡΠΎΠ½Π° Π² Π΄ΠΈΡΠ°ΠΊΠΎΠ²ΡΠΊΠΎΠΌ ΠΌΠ΅ΡΠ°ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π΅. ΠΠΎΠ»ΡΡΠ΅Π½ΠΎ, ΡΡΠΎ ΡΡΠΈ ΡΠ²Π»Π΅Π½ΠΈΡ ΠΎΠΏΠΈΡΡΠ²Π°ΡΡΡΡ ΠΎΠ΄Π½ΠΈΠΌΠΈ ΠΈ ΡΠ΅ΠΌΠ΅ ΠΆΠ΅ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡΠΌΠΈ. ΠΠ°Π»ΠΈΡΠΈΠ΅ ΡΠΈΠ»ΡΠ½ΠΎΠ³ΠΎ ΡΠ»Π΅ΠΊΡΡΠΎΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠ³ΠΎ ΠΏΠΎΠ»Ρ ΠΏΡΠΈΠ²ΠΎΠ΄ΠΈΡ ΠΊ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ ΡΠΏΠ΅ΠΊΡΡΠ° Π½ΠΎΡΠΈΡΠ΅Π»Π΅ΠΉ Π·Π°ΡΡΠ΄Π° Π² Π΄ΠΈΡΠ°ΠΊΠΎΠ²ΡΠΊΠΎΠΌ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π΅. ΠΠ·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΠ΅ Π»ΠΈΠ½Π΅ΠΉΠ½ΠΎ-ΠΏΠΎΠ»ΡΡΠΈΠ·ΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ ΠΏΠΎΠ»Ρ Ρ ΡΠ»Π΅ΠΊΡΡΠΎΠ½Π°ΠΌΠΈ Π² Π΄ΠΈΡΠ°ΠΊΠΎΠ²ΡΠΊΠΎΠΌ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π΅ ΠΏΡΠΈΠ²ΠΎΠ΄ΠΈΡ ΠΊ Π°Π½ΠΈΠ·ΠΎΡΡΠΎΠΏΠΈΠΈ. ΠΡΡ Π°Π½ΠΈΠ·ΠΎΡΡΠΎΠΏΠΈΠΈ ΡΠΎΠ²ΠΏΠ°Π΄Π°Π΅Ρ Ρ Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½ΠΈΠ΅ΠΌ ΡΠ»Π΅ΠΊΡΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΏΠΎΠ»Ρ Π² Π»ΠΈΠ½Π΅ΠΉΠ½ΠΎ- ΠΏΠΎΠ»ΡΡΠΈΠ·ΠΎΠ²Π°Π½Π½ΠΎΠΉ Π²ΠΎΠ»Π½Π΅.
An analogy between the description of the interaction of a spin in an alternating magnetic field and an electron in a Dirac metamaterial has been drawn. It is obtained that these phenomena are described by the same equations. The presence of a strong electromagnetic field leads to a change in the spectrum of charge carriers in the Dirac material. The interaction of a linearly polarized field with electrons in a Dirac material leads to anisotropy. The anisotropy axis coincides with the direction of the electric field in a linearly polarized wave
Optimization, fabrication and characterization of a binary subwavelength cylindrical terahertz lens
A problem of optimizing the subwavelength microrelief of a binary cylindrical transmissive diffractive lens (DL) with a 300-mm focal length for a wavelength of Ξ»=141 ΞΌm was considered. High-resistivity silicon was chosen as the DL substrate material. The angle of incidence of the illuminating beam was taken to be Ο/6. The optimization parameters were the height of the DL profile and the fill factor of the groove. The main goal of optimizing the design was to increase the diffraction efficiency of the lens. The DL diffraction efficiency was calculated using a Fourier mod method. The DL was fabricated by plasma-chemical etching (Bosch process) of the surface of a silicon substrate. The diffraction efficiency of the calculated lens was estimated to be 70%. However, a full-scale experiment showed the real efficiency to be much lower. These differences are related to both errors in the manufacturing process of the DL and non-ideal thickness parameters of the silicon wafers
Simulation of the carbon nanotubes band structure on a supercomputer based with ab initio methods
Π ΡΠ°Π±ΠΎΡΠ΅ ΠΏΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½ Π½ΠΎΠ²ΡΠΉ ΡΠΎΡΠΌΠ°Π»ΠΈΠ·ΠΌ ΠΌΠ΅ΡΠΎΠ΄Π° Π»ΠΈΠ½Π΅Π°ΡΠΈΠ·ΠΎΠ²Π°Π½Π½ΡΡ
ΠΏΡΠΈΡΠΎΠ΅Π΄ΠΈΠ½Π΅Π½Π½ΡΡ
ΡΠΈΠ»ΠΈΠ½Π΄ΡΠΈΡΠ΅ΡΠΊΠΈΡ
Π²ΠΎΠ»Π½. ΠΠ»Ρ ΠΏΠΎΡΡΡΠΎΠ΅Π½ΠΈΡ Π±Π°Π·ΠΈΡΠ½ΡΡ
ΡΡΠ½ΠΊΡΠΈΠΉ ΡΠ»Π΅ΠΊΡΡΠΎΠ½Π½ΡΠΉ ΠΏΠΎΡΠ΅Π½ΡΠΈΠ°Π» Π±Π΅ΡΠ΅ΡΡΡ ΡΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠΈ ΡΠΈΠΌΠΌΠ΅ΡΡΠΈΡΠ½ΡΠΌ Π² Π°ΡΠΎΠΌΠ½ΡΡ
ΠΎΠ±Π»Π°ΡΡΡΡ
, ΠΏΠΎΡΡΠΎΡΠ½Π½ΡΠΌ Π² ΠΏΡΠΎΠΌΠ΅ΠΆΡΡΠΎΡΠ½ΠΎΠΉ ΠΎΠ±Π»Π°ΡΡΠΈ ΠΈ ΡΠΈΠ»ΠΈΠ½Π΄ΡΠΈΡΠ΅ΡΠΊΠΈ ΡΠΈΠΌΠΌΠ΅ΡΡΠΈΡΠ½ΡΠΌ Π² Π²Π°ΠΊΡΡΠΌΠ½ΡΡ
ΠΎΠ±Π»Π°ΡΡΡΡ
. ΠΠ°Π·ΠΈΡΠ½ΡΠ΅ ΡΡΠ½ΠΊΡΠΈΠΈ ΠΌΠ΅ΡΠΎΠ΄Π°, ΠΏΠΎΠ»ΡΡΠ°Π΅ΠΌΡΠ΅ ΠΈΠ· ΡΠ΅ΡΠ΅Π½ΠΈΡ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ Π¨ΡΠ΅Π΄ΠΈΠ½Π³Π΅ΡΠ° Π² ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΡΡΡΠΈΡ
ΠΎΠ±Π»Π°ΡΡΡΡ
, ΡΡΠΈΠ²Π°ΡΡΡΡ Π½Π° Π³ΡΠ°Π½ΠΈΡΠ°Ρ
ΠΠ’-ΡΡΠ΅Ρ ΠΈ ΡΠΈΠ»ΠΈΠ½Π΄ΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΡΡ
ΡΡΡΠ±ΠΊΠΈ, ΠΎΠ±ΡΠ°Π·ΡΡ Π²ΡΡΠ΄Ρ Π½Π΅ΠΏΡΠ΅ΡΡΠ²Π½ΡΠ΅ Π΄ΠΈΡΡΠ΅ΡΠ΅Π½ΡΠΈΡΡΠ΅ΠΌΡΠ΅ ΡΡΠ½ΠΊΡΠΈΠΈ. ΠΠ»Ρ Π°ΠΏΡΠΎΠ±Π°ΡΠΈΠΈ ΠΌΠ΅ΡΠΎΠ΄Π° Π±ΡΠ»ΠΈ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½Ρ ΡΠ°ΡΡΠ΅ΡΡ Π·ΠΎΠ½Π½ΠΎΠΉ ΡΡΡΡΠΊΡΡΡΡ Π½Π΅Ρ
ΠΈΡΠ°Π»ΡΠ½ΠΎΠΉ ΠΏΠΎΠ»ΡΠΏΡΠΎΠ²ΠΎΠ΄Π½ΠΈΠΊΠΎΠ²ΠΎΠΉ (10,0) ΠΈ ΠΌΠ΅ΡΠ°Π»Π»ΠΈΡΠ΅ΡΠΊΠΎΠΉ (6,6) ΠΎΠ΄Π½ΠΎΡΡΠ΅Π½Π½ΡΡ
ΡΠ³Π»Π΅ΡΠΎΠ΄Π½ΡΡ
Π½Π°Π½ΠΎΡΡΡΠ±ΠΎΠΊ. We proposed a new formalism. For the construction of basis functions, the electron potential is taken to be spherically symmetric in atomic regions, constant in the intermediate region and cylindrically symmetric in the vacuum regions. The basic functions of the method obtained from the solution of the SchrΓΆdinger equation in the corresponding domains, are sewn
on the boundaries of the MT spheres and the cylindrical surfaces of the tube, forming
everywhere continuous differentiable functions. For the approbation of the method,
calculations were made of the band structure of the nonchiral semiconductor (10.0) and metallic (6.6) single-walled carbon nanotubes.Π Π°Π±ΠΎΡΠ° Π²ΡΠΏΠΎΠ»Π½Π΅Π½Π° ΠΏΡΠΈ ΠΏΠΎΠ΄Π΄Π΅ΡΠΆΠΊΠ΅ Π€Π΅Π΄Π΅ΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ Π°Π³Π΅Π½ΡΡΡΠ²Π° Π½Π°ΡΡΠ½ΡΡ
ΠΎΡΠ³Π°Π½ΠΈΠ·Π°ΡΠΈΠΉ (ΡΠΎΠ³Π»Π°ΡΠ΅Π½ΠΈΠ΅ No 007-ΠΠ/Π§3363/26) ΠΈ Π³ΡΠ°Π½ΡΠΎΠ² Π ΠΎΡΡΠΈΠΉΡΠΊΠΎΠ³ΠΎ ΡΠΎΠ½Π΄Π° ΡΡΠ½Π΄Π°ΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ (Π Π€Π€Π) No16-29-09528 ΠΈ No16-29-11744