290 research outputs found

    Self-induced and induced transparencies of two-dimensional and three- dimensional superlattices

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    The phenomenon of transparency in two-dimensional and three-dimensional superlattices is analyzed on the basis of the Boltzmann equation with a collision term encompassing three distinct scattering mechanisms (elastic, inelastic and electron-electron) in terms of three corresponding distinct relaxation times. On this basis, we show that electron heating in the plane perpendicular to the current direction drastically changes the conditions for the occurrence of self-induced transparency in the superlattice. In particular, it leads to an additional modulation of the current amplitudes excited by an applied biharmonic electric field with harmonic components polarized in orthogonal directions. Furthermore, we show that self-induced transparency and dynamic localization are different phenomena with different physical origins, displaced in time from each other, and, in general, they arise at different electric fields.Comment: to appear in Physical Review

    Applying method of phase plane to a fuzzy trend when predicting the project metrics presented by time series

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    In the article is proposed the method of applying the entropy measure to the fuzzy trend of time series of design metrics. An analysis of project performance is described. A prediction algorithm has been developed and implemented. The algorithm is based on the indices of fuzzy trends in time series. The formula for the entropy measure according to the fuzzy trend for a fuzzy time series is defined. The measure of entropy uses statistical information on the behavior of a fuzzy trend on the phase plane. The hypothesis of trend stability is used for forecasting. Experiments based on this approach are presented.The article was supported by the Russian Foundation for Basic Research (grant No. 19-07-00999)

    Application of the anomaly pattern in forecasting time series of project activity metrics

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    This article describes the method of application of an anomaly template of time series of project metrics based on entropy. The analysis of project activity metrics is described. The forecasting algorithm based on the fuzzy trends of time series of indicators was developed and implemented. The formula for the entropy measure for the fuzzy time series is determined. The algorithm uses the dependence of the forecast on the measures of entropy. The hypothesis of trend stability is used for forecasting. Experiments based on this approach are presented.The article was supported by the Russian Foundation for Basic Research (grant No. 16-47-732070)

    Quantum-mechanical simulations of interaction of many-electron quantum systems with ionizing laser pulses

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    We develop parallel program for numerical simulation of the interaction of intense laser pulses with manyelectron atoms on the basis of the time-dependent Kohn-Sham equations. It is shown that the use of modern computer clusters makes it possible to solve these equations for a wide class of atoms in a relatively small time, determined by the parameters of the laser pulse and electronic configuration of the atom. High accuracy of the numerical code is demonstrated on the example of calculating the high-frequency spectrum of electron current excited during ionization of noble gas atoms by few-cycle laser pulse.Π ΠΎΠ·Ρ€ΠΎΠ±Π»ΡΡ”Ρ‚ΡŒΡΡ ΠΏΠ°Ρ€Π°Π»Π΅Π»ΡŒΠ½ΠΈΠΉ ΠΏΡ€ΠΎΠ³Ρ€Π°ΠΌΠ½ΠΈΠΉ ΠΊΠΎΠ΄ для Ρ‡ΠΈΡΠ΅Π»ΡŒΠ½ΠΎΠ³ΠΎ модСлювання Π²Π·Π°Ρ”ΠΌΠΎΠ΄Ρ–Ρ— інтСнсивних Π»Π°Π·Π΅Ρ€Π½ΠΈΡ… Ρ–ΠΌΠΏΡƒΠ»ΡŒΡΡ–Π² Π· Π±Π°Π³Π°Ρ‚ΠΎΠ΅Π»Π΅ΠΊΡ‚Ρ€ΠΎΠ½Π½ΠΈΠΌΠΈ Π°Ρ‚ΠΎΠΌΠ°ΠΌΠΈ Π½Π° основі нСстаціонарного ΠΌΠ΅Ρ‚ΠΎΠ΄Ρƒ Ρ„ΡƒΠ½ΠΊΡ†Ρ–ΠΎΠ½Π°Π»Π° Ρ‰Ρ–Π»ΡŒΠ½ΠΎΡΡ‚Ρ–. ΠŸΠΎΠΊΠ°Π·ΡƒΡ”Ρ‚ΡŒΡΡ, Ρ‰ΠΎ використання сучасних багатопроцСсорних ΠΎΠ±Ρ‡ΠΈΡΠ»ΡŽΠ²Π°Π»ΡŒΠ½ΠΈΡ… кластСрів дозволяє розв’язати нСстаціонарні рівняння Кона-Π¨Π΅ΠΌΠ° для ΡˆΠΈΡ€ΠΎΠΊΠΎΠ³ΠΎ класу Π°Ρ‚ΠΎΠΌΡ–Π² Π·Π° відносно Π½Π΅Π²Π΅Π»ΠΈΠΊΠΈΠΉ час, Ρ‰ΠΎ Π²ΠΈΠ·Π½Π°Ρ‡Π°Ρ”Ρ‚ΡŒΡΡ ΠΏΠ°Ρ€Π°ΠΌΠ΅Ρ‚Ρ€Π°ΠΌΠΈ Π»Π°Π·Π΅Ρ€Π½ΠΎΠ³ΠΎ Ρ–ΠΌΠΏΡƒΠ»ΡŒΡΡƒ Ρ– Π΅Π»Π΅ΠΊΡ‚Ρ€ΠΎΠ½Π½ΠΎΡŽ ΠΊΠΎΠ½Ρ„Ρ–Π³ΡƒΡ€Π°Ρ†Ρ–Ρ”ΡŽ Π°Ρ‚ΠΎΠΌΠ°. ДСмонстрація Ρ€ΠΎΠ±ΠΎΡ‚ΠΈ Ρ‡ΠΈΡΠ΅Π»ΡŒΠ½ΠΎΠ³ΠΎ ΠΊΠΎΠ΄Ρƒ прСдставлСна Π½Π° ΠΏΡ€ΠΈΠΊΠ»Π°Π΄Ρ– Ρ€ΠΎΠ·Ρ€Π°Ρ…ΡƒΠ½ΠΊΡƒ спСктра високочастотного Π΅Π»Π΅ΠΊΡ‚Ρ€ΠΎΠ½Π½ΠΎΠ³ΠΎ струму, Ρ‰ΠΎ Π·Π±ΡƒΠ΄ΠΆΡƒΡ”Ρ‚ΡŒΡΡ ΠΏΡ€ΠΈ Ρ–ΠΎΠ½Ρ–Π·Π°Ρ†Ρ–Ρ— Π°Ρ‚ΠΎΠΌΡ–Π² Ρ–Π½Π΅Ρ€Ρ‚Π½ΠΈΡ… Π³Π°Π·Ρ–Π² ΠΊΠΎΡ€ΠΎΡ‚ΠΊΠΈΠΌ Π»Π°Π·Π΅Ρ€Π½ΠΈΠΌ Ρ–ΠΌΠΏΡƒΠ»ΡŒΡΠΎΠΌ.РазрабатываСтся ΠΏΠ°Ρ€Π°Π»Π»Π΅Π»ΡŒΠ½Ρ‹ΠΉ ΠΏΡ€ΠΎΠ³Ρ€Π°ΠΌΠΌΠ½Ρ‹ΠΉ ΠΊΠΎΠ΄ для числСнного модСлирования взаимодСйствия интСнсивных Π»Π°Π·Π΅Ρ€Π½Ρ‹Ρ… ΠΈΠΌΠΏΡƒΠ»ΡŒΡΠΎΠ² с многоэлСктронными Π°Ρ‚ΠΎΠΌΠ°ΠΌΠΈ Π½Π° основС нСстационарного ΠΌΠ΅Ρ‚ΠΎΠ΄Π° Ρ„ΡƒΠ½ΠΊΡ†ΠΈΠΎΠ½Π°Π»Π° плотности. ΠŸΠΎΠΊΠ°Π·Ρ‹Π²Π°Π΅Ρ‚ΡΡ, Ρ‡Ρ‚ΠΎ использованиС соврСмСнных многопроцСссорных Π²Ρ‹Ρ‡ΠΈΡΠ»ΠΈΡ‚Π΅Π»ΡŒΠ½Ρ‹Ρ… кластСров позволяСт Ρ€Π΅ΡˆΠΈΡ‚ΡŒ нСстационарныС уравнСния Кона-Шэма для ΡˆΠΈΡ€ΠΎΠΊΠΎΠ³ΠΎ класса Π°Ρ‚ΠΎΠΌΠΎΠ² Π·Π° ΠΎΡ‚Π½ΠΎΡΠΈΡ‚Π΅Π»ΡŒΠ½ΠΎ нСбольшоС врСмя, опрСдСляСмоС ΠΏΠ°Ρ€Π°ΠΌΠ΅Ρ‚Ρ€Π°ΠΌΠΈ Π»Π°Π·Π΅Ρ€Π½ΠΎΠ³ΠΎ ΠΈΠΌΠΏΡƒΠ»ΡŒΡΠ° ΠΈ элСктронной ΠΊΠΎΠ½Ρ„ΠΈΠ³ΡƒΡ€Π°Ρ†ΠΈΠ΅ΠΉ Π°Ρ‚ΠΎΠΌΠ°. ДСмонстрация Ρ€Π°Π±ΠΎΡ‚Ρ‹ числСнного ΠΊΠΎΠ΄Π° прСдставлСна Π½Π° ΠΏΡ€ΠΈΠΌΠ΅Ρ€Π΅ расчСта спСктра высокочастотного элСктронного Ρ‚ΠΎΠΊΠ°, Π²ΠΎΠ·Π±ΡƒΠΆΠ΄Π°Π΅ΠΌΠΎΠ³ΠΎ ΠΏΡ€ΠΈ ΠΈΠΎΠ½ΠΈΠ·Π°Ρ†ΠΈΠΈ Π°Ρ‚ΠΎΠΌΠΎΠ² ΠΈΠ½Π΅Ρ€Ρ‚Π½Ρ‹Ρ… Π³Π°Π·ΠΎΠ² ΠΊΠΎΡ€ΠΎΡ‚ΠΊΠΈΠΌ Π»Π°Π·Π΅Ρ€Π½Ρ‹ΠΌ ΠΈΠΌΠΏΡƒΠ»ΡŒΡΠΎΠΌ

    Comparison of the functional state level with the level physical excellence in a 2000 meter run for young medicines

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    An objective assessment of physical health, physical fitness and the establishment of their dynamics over time is an indispensable condition for effective management of the educational process. Research goal: to compare the level of functional condition with the level of physical fitness in the 2000-meter run among medical boys. Research methods: as an assessment of the level of functional state, the following were taken: the Martin-Kushelevsky test, the Harvard step test, and to determine the level of physical fitness, the results of control testing were taken: running 30 m and 2000 m, long jump from a place, shuttle running 4x9 m, bending forward, lifting the torso in 1 min, bending and unbending the arms in a prone position and pulling up on a high crossbar. Conclusions: as a result of the study, we determined that the level of physical fitness of students in the 2000 m run is mainly low, and the level of functional state according to the Martin-Kushelevsky and Harvard step test has mainly high indicators.ΠžΠ±ΡŠΠ΅ΠΊΡ‚ΠΈΠ²Π½Π°Ρ ΠΎΡ†Π΅Π½ΠΊΠ° физичСского Π·Π΄ΠΎΡ€ΠΎΠ²ΡŒΡ, физичСской подготовлСнности ΠΈ установлСниС ΠΈΡ… Π΄ΠΈΠ½Π°ΠΌΠΈΠΊΠΈ Π²ΠΎ Π²Ρ€Π΅ΠΌΠ΅Π½ΠΈ - Π½Π΅ΠΏΡ€Π΅ΠΌΠ΅Π½Π½ΠΎΠ΅ условиС эффСктивного управлСния ΡƒΡ‡Π΅Π±Π½Ρ‹ΠΌ процСссом. ЦСль исслСдования: ΡΡ€Π°Π²Π½ΠΈΡ‚ΡŒ ΡƒΡ€ΠΎΠ²Π΅Π½ΡŒ Ρ„ΡƒΠ½ΠΊΡ†ΠΈΠΎΠ½Π°Π»ΡŒΠ½ΠΎΠ³ΠΎ состояния с ΡƒΡ€ΠΎΠ²Π½Π΅ΠΌ физичСской подготовлСнности Π² Π±Π΅Π³Π΅ Π½Π° 2000 ΠΌ срСди юношСй-ΠΌΠ΅Π΄ΠΈΠΊΠΎΠ². ΠœΠ΅Ρ‚ΠΎΠ΄Ρ‹ исслСдования: Π² качСствС ΠΎΡ†Π΅Π½ΠΊΠΈ уровня Ρ„ΡƒΠ½ΠΊΡ†ΠΈΠΎΠ½Π°Π»ΡŒΠ½ΠΎΠ³ΠΎ состояния Π±Ρ‹Π»ΠΈ взяты: ΠΏΡ€ΠΎΠ±Π° ΠœΠ°Ρ€Ρ‚ΠΈΠ½Π°-ΠšΡƒΡˆΠ΅Π»Π΅Π²ΡΠΊΠΎΠ³ΠΎ, стСп-тСст Π“Π°Ρ€Π²Π°Ρ€Π΄Π°, Π° для опрСдСлСния уровня физичСской подготовлСнности взяты Ρ€Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚Ρ‹ ΠΊΠΎΠ½Ρ‚Ρ€ΠΎΠ»ΡŒΠ½ΠΎΠ³ΠΎ тСстирования: Π±Π΅Π³ Π½Π° 30 ΠΌ ΠΈ 2000 ΠΌ, ΠΏΡ€Ρ‹ΠΆΠΎΠΊ Π² Π΄Π»ΠΈΠ½Ρƒ с мСста, Π±Π΅Π³ ΠΏΠΎ Π²ΠΎΠ»Π°Π½Ρƒ 4Ρ…9 ΠΌ, Π½Π°ΠΊΠ»ΠΎΠ½ Π²ΠΏΠ΅Ρ€Π΅Π΄, подъСм Ρ‚ΡƒΠ»ΠΎΠ²ΠΈΡ‰Π° Π·Π° 1 ΠΌΠΈΠ½, сгибаниС ΠΈ Ρ€Π°Π·Π³ΠΈΠ±Π°Π½ΠΈΠ΅ Ρ€ΡƒΠΊ Π² ΠΏΠΎΠ»ΠΎΠΆΠ΅Π½ΠΈΠΈ Π»Π΅ΠΆΠ° ΠΈ подтягиваниС Π½Π° высокой ΠΏΠ΅Ρ€Π΅ΠΊΠ»Π°Π΄ΠΈΠ½Π΅. Π’Ρ‹Π²ΠΎΠ΄Ρ‹: Π² Ρ€Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚Π΅ исслСдования ΠΎΠΏΡ€Π΅Π΄Π΅Π»Π΅Π½ΠΎ, Ρ‡Ρ‚ΠΎ ΡƒΡ€ΠΎΠ²Π΅Π½ΡŒ физичСской подготовлСнности студСнтов Π² Π±Π΅Π³Π΅ Π½Π° 2000 ΠΌ прСимущСствСнно Π½ΠΈΠ·ΠΊΠΈΠΉ, Π° ΡƒΡ€ΠΎΠ²Π΅Π½ΡŒ Ρ„ΡƒΠ½ΠΊΡ†ΠΈΠΎΠ½Π°Π»ΡŒΠ½ΠΎΠ³ΠΎ состояния ΠΏΠΎ стСп-тСсту ΠœΠ°Ρ€Ρ‚ΠΈΠ½Π°-ΠšΡƒΡˆΠ΅Π»Π΅Π²ΡΠΊΠΎΠ³ΠΎ ΠΈ Гарвардского стСп-тСста ΠΈΠΌΠ΅Π΅Ρ‚ прСимущСствСнно высокиС ΠΏΠΎΠΊΠ°Π·Π°Ρ‚Π΅Π»ΠΈ

    Π”ΠΈΠ½Π°ΠΌΠΈΠΊΠ° приростов Ρ‚Π΅Π»ΠΎΠΊ ΠΈ ΠΏΠΎΠΊΠ°Π·Π°Ρ‚Π΅Π»Π΅ΠΉ ΠΌΠΎΠ»ΠΎΡ‡Π½ΠΎΠΉ продуктивности ΠΊΠΎΡ€ΠΎΠ² Π² Ρ‚Π΅Ρ‡Π΅Π½ΠΈΠ΅ Π»Π°ΠΊΡ‚Π°Ρ†ΠΈΠΈ Π² зависимости ΠΎΡ‚ уровня космофизичСской активности

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    The questions of interrelation of animals productivity with parameters of space activity are considered. Data about rhythmicity of changes of the studied parameters depending on space activity are cited.Π’ ΡΡ‚Π°Ρ‚ΡŒΠ΅ Ρ€Π°ΡΡΠΌΠ°Ρ‚Ρ€ΠΈΠ²Π°ΡŽΡ‚ΡΡ вопросы взаимосвязи продуктивности ΠΆΠΈΠ²ΠΎΡ‚Π½Ρ‹Ρ… с показатСлями космофизичСской активности. ΠŸΡ€ΠΈΠ²ΠΎΠ΄ΡΡ‚ΡΡ Π΄Π°Π½Π½Ρ‹Π΅ ΠΎ ритмичности ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠΉ ΠΈΠ·ΡƒΡ‡Π΅Π½Π½Ρ‹Ρ… ΠΏΠΎΠΊΠ°Π·Π°Ρ‚Π΅Π»Π΅ΠΉ Π² зависимости ΠΎΡ‚ космофизичСской активности

    ΠžΡΡ‚Π΅ΠΎΠΌΠ°Π»ΡΡ†ΠΈΡ Ρƒ ΠΊΠΎΡ€ΠΎΠ² ΠΈ Π΅Π΅ влияниС Π½Π° Ρ€Π°Π·Π²ΠΈΡ‚ΠΈΠ΅ ΠΈ ΠΌΠΎΠ»ΠΎΡ‡Π½ΡƒΡŽ ΠΏΡ€ΠΎΠ΄ΡƒΠΊΡ‚ΠΈΠ²Π½ΠΎΡΡ‚ΡŒ потомства

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    The present study investigates the influence of bone disease in cows on their milk production and productivity of their offspring (in 3 generations). In herds with a manifestation of bone disease using oxen-improvers has no effect.Π’ ΡΡ‚Π°Ρ‚ΡŒΠ΅ прСдставлСны Ρ€Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚Ρ‹ исслСдований влияния остСодистрофии Ρƒ ΠΊΠΎΡ€ΠΎΠ² Π½Π° ΠΈΡ… ΠΌΠΎΠ»ΠΎΡ‡Π½ΡƒΡŽ ΠΏΡ€ΠΎΠ΄ΡƒΠΊΡ‚ΠΈΠ²Π½ΠΎΡΡ‚ΡŒ ΠΈ ΠΏΡ€ΠΎΠ΄ΡƒΠΊΡ‚ΠΈΠ²Π½ΠΎΡΡ‚ΡŒ ΠΈΡ… потомства (Π² 3-Ρ… поколСниях). Π’ стадах с проявлСниСм остСодистрофии использованиС Π±Ρ‹ΠΊΠΎΠ²-ΡƒΠ»ΡƒΡ‡ΡˆΠ°Ρ‚Π΅Π»Π΅ΠΉ Π½Π΅ Π΄Π°Π΅Ρ‚ эффСкта

    Анализ ΠΊΠ°Ρ€ΠΈΠΎΡ‚ΠΈΠΏΠΎΠ² домашнСй собаки (Canis familiaris L.)

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    Karyotypes of sheltie and poodle breeds population of the city of Moscow are given. Describes the data on chromosomal abnormalities that occur in dogs. There are cases of chimerism and mosaicism for sex chromosomes. It is shown that in the case of chimerism on the sex chromosomes of male, repro-ductive function was normal.ΠžΠΏΠΈΡΠ°Π½Ρ‹ ΠΊΠ°Ρ€ΠΈΠΎΡ‚ΠΈΠΏΡ‹ собак ΠΏΠΎΡ€ΠΎΠ΄ ΡˆΠ΅Π»Ρ‚ΠΈ ΠΈ ΠΏΡƒΠ΄Π΅Π»ΡŒ ΠΈΠ· популяции Π³ΠΎΡ€ΠΎΠ΄Π° ΠœΠΎΡΠΊΠ²Ρ‹. ΠŸΡ€ΠΈΠ²Π΅Π΄Π΅Π½Ρ‹ Π΄Π°Π½Π½Ρ‹Π΅ ΠΎ хромосомных аномалиях, Π²ΡΡ‚Ρ€Π΅Ρ‡Π°ΡŽΡ‰ΠΈΡ…ΡΡ Ρƒ собак. ΠžΠΏΠΈΡΠ°Π½Ρ‹ случаи Ρ…ΠΈΠΌΠ΅Ρ€ΠΈΠ·ΠΌΠ° ΠΈ ΠΌΠΎΠ·Π°ΠΈΡ†ΠΈΠ·ΠΌΠ° ΠΏΠΎ ΠΏΠΎΠ»ΠΎΠ²Ρ‹ΠΌ хромосомам. Показано, Ρ‡Ρ‚ΠΎ Π² случаС Ρ…ΠΈΠΌΠ΅Ρ€ΠΈΠ·ΠΌΠ° ΠΏΠΎ ΠΏΠΎΠ»ΠΎΠ²Ρ‹ΠΌ хромосомам Π²ΠΎΡΠΏΡ€ΠΎΠΈΠ·Π²ΠΎΠ΄ΠΈΡ‚Π΅Π»ΡŒΠ½Π°Ρ функция Ρƒ кобСля Π±Ρ‹Π»Π° Π² Π½ΠΎΡ€ΠΌΠ΅

    Modeling of grain subdivision during severe plastic deformation by VPSC method combined with disclination analysis

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    Microstructure development during severe plastic deformation by simple shear is modeled using a combination of the visco-plastic self-consistent (VPSC) method and a disclination model. Strain incompatibilities between a homogeneous effective medium and a grain are calculated by VPSC. These are assumed to result in an accumulation of disclinations in the junctions of a grain that are relaxed by a growth of low-angle dislocation boundaries from the junctions. Predicted misorientation distributions between subgrains and their parent grains agree semi-quantitatively with experimental misorientation distributions for geometrically necessary boundaries. The texture after 100% simple shear was found to be insensitive to the presence of subgrains with misorientations less than 15ΒΊ
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