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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Govorun I. V., Leksikov A. A., Serzhantov A. M.
Заглавие : Compact microwave power limiter with htsc element
Место публикации : J. Sib. Fed. Univ. Math. Phys. - 2018. - Vol. 11, Is. 1. - P.35-39. - ISSN 19971397 (ISSN), DOI 10.17516/1997-1397-2018-11-1-35-39; Журн. СФУ. Сер. "Математика и физика"
Примечания : Cited References: 9. - The work was supported by the Ministry of Education and Science of the Russian Federation, grant СП-3036.2016.3. of the President of the Russian Federation for State Support of Young Russian Scientists.
Ключевые слова (''Своб.индексиров.''): power limiter--microwave--damping pole--microstripe structure--htsc--ограничитель мощности--свч--полюс затухания--микрополосковая структура--втсп
Аннотация: A design of microwave power limiter having a structure of three-pole microstrip filter is developed. In the device outer resonators are coupled through an inner resonator containing high-temperature super- conducting film. Prototype of the device with central frequency 7.9 GHz and relative bandwidth 9% has insertion loss 1.5 dB in the open state and suppress a signal not less 30 dB in the limitation state.Была разработана конструкция ограничителя СВЧ-мощности, имеющая структуру трехзвенного микрополоскового фильтра. В устройстве внешние резонаторы связаны посредством внутреннего, содержащего ВТСП-пленку. Макет устройства с центральной частотой 7.9 ГГц и относительной полосой пропускания 9% имеет потери 1.5 дБ в открытом состоянии и не менее 30 дБ ослабления в режиме ограничения.
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Belyaev B. A., Babitskii A. N., Boev N. M., Izotov A. V., Sushkov A. A., Korolev E. V., Burmitskikh A. V.
Заглавие : Compact non-linear power amplifier for wideband underwater and underground near-field magnetic communication systems
Коллективы : International Siberian Conference on Control and Communications
Место публикации : International Siberian Conference on Control and Communications, SIBCON 2019: Proceedings: IEEE, 2019. - Ст.8729580. - , DOI 10.1109/SIBCON.2019.8729580
Примечания : Cited References: 6. - This work was supported by the Ministry of Education and Science of the Russian Federation, Task no. 3.1031.2017/PCh.
Аннотация: The paper describes a non-linear power amplifier developed for mobile wideband transceivers of near-field magnetic communication systems. The power amplifier has following parameters: voltage range - up to 200 V; power consumption - up to 200 W; maximum load current - up to 100 A; maximum frequency - 200 kHz; overall dimensions - 100x100x40 mm and weight - ~200 g (without heat sink). Mobile near-field magnetic communication systems equipped with such amplifier are able to provide a voice communication range up to 150 m. The systems can be employed in constructing of various underwater and underground communication networks, for example, in mines or for divers. Results of near-field communication system field testing with the developed non-linear power amplifier are shown. The authors propose a simple algorithm for the main parameters of the power amplifier and the transmitter antenna selection.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Внукова, Наталья Григорьевна, Лопатин, Владислав Александрович, Осипова, Ирина Владимировна, Чурилов, Григорий Николаевич
Заглавие : Comparative characteristics of alternating current light source with copper and silver electrodes under power samples analysis
Коллективы : "Современный атомно-эмиссионный анализ и науки о земле", семинар, Российская академия наук, Сибирское отделение РАН, Иркутский научынй центр СО РАН, Институт геохимии им. А. П. Виноградова СО РАН
Место публикации : Современный атомно-эмиссионный анализ и науки о земле: программа и тезисы докл. науч. семинара с междунар. участием, посвящ. 150-летию создания Кирхгофом и Бунзеном основ атом. спектроскопии, 30 июня - 4 июля 2009 г., г. Иркутск/ [отв. ред.: Е. В. Шабанова, О. В. Зарубина]. - 2009. - С. 17-18. - ISBN 978-5-94797-139-2
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Berggren K. F., Sadreev A. F., Starikov A. A.
Заглавие : Crossover from regular to irregular behavior in current flow through open billiards
Место публикации : Phys. Rev. E: AMER PHYSICAL SOC, 2002. - Vol. 66, Is. 1. - Ст.16218. - ISSN 1539-3755, DOI 10.1103/PhysRevE.66.016218
Примечания : Cited References: 36
Предметные рубрики: PHASE SINGULARITIES
NODAL POINTS
WAVE-FIELDS
QUANTUM
STREAMLINES
CONDUCTANCE
VORTICES
CHAOS
Ключевые слова (''Своб.индексиров.''): eigenvalues and eigenfunctions--mathematical models--networks (circuits)--random processes--resonance--signal processing--spurious signal noise--bursting time series--coherence resonance--power spectrum--stochastic resonance--chaos theory
Аннотация: We discuss signatures of quantum chaos in terms of distributions of nodal points, saddle points, and streamlines for coherent electron transport through two-dimensional billiards, which are either nominally integrable or chaotic. As typical examples of the two cases we select rectangular and Sinai billiards. We have numerically evaluted distribution functions for nearest distances between nodal points and found that there is a generic form for open chaotic billiards through which a net current is passed. We have also evaluated the distribution functions for nodal points with specific vorticity (winding number) as well as for saddle points. The distributions may be used as signatures of quantum chaos in open systems. All distributions are well reproduced using random complex linear combinations of nearly monochromatic states in nominally closed billiards. In the case of rectangular billiards with simple sharp-cornered leads the distributions have characteristic features related to order among the nodal points. A flaring or rounding of the contact regions may, however, induce a crossover to nodal point distributions and current flow typical for quantum chaos. For an irregular arrangement of nodal points, as for example in the Sinai billiard, the quantum flow lines become very complex and volatile, recalling chaos among classical trajectories. Similarities with percolation are pointed out.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shanidze L. V., Tarasov A. S., Rautskiy M. V., Zelenov F. V., Konovalov S. O., Nemtsev I. V., Voloshin A. S., Tarasov I. A., Baron F. A., Volkov N. V.
Заглавие : Cu-doped TiNxOy thin film resistors DC/RF performance and reliability
Коллективы : RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science [20-42-240013]; Government of the Russian Federation for Creation ofWorld Tier Laboratories [075-15-2019-1886]
Место публикации : Appl. Sci. - 2021. - Vol. 11, Is. 16. - Ст.7498. - ISSN 2076-3417(eISSN), DOI 10.3390/app11167498
Примечания : Cited References: 13. - This research was funded by RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science, project code 20-42-240013 and by Grant of the Government of the Russian Federation for Creation ofWorld Tier Laboratories (contract No. 075-15-2019-1886)
Предметные рубрики: GROWTH
Аннотация: We fabricated Cu-doped TiNxOy thin film resistors by using atomic layer deposition, optical lithography, dry etching, Ti/Cu/Ti/Au e-beam evaporation and lift-off processes. The results of the measurements of the resistance temperature dependence, non-linearity, S-parameters at 0.01–26 GHz and details of the breakdown mechanism under high-voltage stress are reported. The devices’ sheet resistance is 220 ± 8 Ω/□ (480 ± 20 µΩ*cm); intrinsic resistance temperature coefficient (TCR) is ~400 ppm/°C in the T-range of 10–300 K; and S-parameters versus frequency are flat up to 2 GHz with maximum variation of 10% at 26 GHz. The resistors can sustain power and current densities up to ~5 kW*cm−2 and ~2 MA*cm−2, above which they switch to high-resistance state with the sheet resistance equal to ~200 kΩ/□ (~0.4 Ω*cm) caused by nitrogen and copper desorption from TiNxOy film. The Cu/Ti/TiNxOy contact is prone to ageing due to gradual titanium oxidation while the TiNxOy resistor body is stable. The resistors have strong potential for applications in high-frequency integrated and hybrid circuits that require small-footprint, medium-range resistors of 0.05–10 kΩ, with small TCR and high-power handling capability.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Pilipchuk A. S., Sadreev A. F.
Заглавие : Desktop laboratory of bound states in the continuum in metallic waveguide with dielectric cavities
Место публикации : Phys. Rev. B. - 2022. - Vol. 106, Is. 7. - Ст.075304. - ISSN 24699950 (ISSN), DOI 10.1103/PhysRevB.106.075304
Примечания : Cited References: 64. - We are grateful to Lujun Huang, Andrey Miroshnichenko and Yi Xu for presentation of unpublished paper and discussions. The research was supported by Russian Science Foundation No. 22-12-00070
Аннотация: We consider dielectric cavities whose radiation space is restricted by two parallel metallic planes. The TM solutions of the Maxwell equations of the system are equivalent to the solutions of periodical arrays of dielectric cavities. The system readily allows to achieve bound states in the continuum (BICs) of any type including topological BICs as dependent on position and orientation of the cavities relative to the planes and that extremely facilitates experimental studies in comparison to infinite arrays of the cavities. We show the effect of merging of topologically protected BICs that pushes the square asymptotic of the Q factor into the power degree 4 or even 6.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : KARYAGIN V. V., LYAPILIN I. I., DYAKIN V. V.
Заглавие : DRAG THERMOELECTRIC-POWER OF A TWO-DIMENSIONAL ELECTRON-GAS IN A GAAS-GAAIAS HETEROSTRUCTURE
Место публикации : SOVIET PHYSICS SEMICONDUCTORS-USSR: AMER INST PHYSICS, 1988. - Vol. 22, Is. 8. - P954-955. - ISSN 0038-5700
Примечания : Cited References: 3
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Afonin A. O., Alexandrovsky A. S., Govorun I. V., Leksikov A. A., Ugryumov A. V., Ogorodnikov D. K.
Заглавие : Dual band HTSC power limiter
Колич.характеристики :7 с
Место публикации : J. Sib. Fed. Univ. Math. Phys. - 2024. - Vol. 17, Is. 2. - P.162-168. - ISSN 19971397 (ISSN); Журн. СФУ. Матем. и физ.
Примечания : Cited References: 10
Аннотация: A new construction of dual band HTSC power limiter is proposed. The device consists of two microstrip bandpass filters. Each filter consists of two quarter-wave resonators which couple through a composite half-wave resonator with HTSC-element. The prototype of the device in the open mode has operation passband of about 10% and 11% with central frequency being equal to 1.48 GHz and 2.03 GHz, the minimum loss in the passband is equal 1.9 dB and 1.7 dB for LF-channel and HF-channel correspondingly. The transfer characteristics of the device were investigated in the case of microwave power level up to 3.15 W.Предложена новая конструкция ВТСП ограничителя мощности с двумя рабочими полосами. Ограничитель содержит два микрополосковых полосно-пропускающих фильтра. Каждый фильтр состоит из двух четвертьволновых резонаторов, которые связаны между собой через составной полуволновый резонатор, содержащий пленку из высокотемпературного сверхпроводника. Макет устройства в открытом режиме имеет ширины рабочих полос пропускания 10% и 11% с центральными частотами 1.48 ГГц и 2.03 ГГц. Минимальные вносимые потери составили 1.9 дБ и 1.7 дБ для НЧ- и ВЧ-каналов соответственно. Передаточные характеристики устройства были исследованы до уровня СВЧ-мощности 3.15 Вт.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Arkhipkin V. G., Manushkin D. V., Timofeev V. P., Timofeev I. V.
Заглавие : Efficient selective excitation in optically thick extensive media by adiabatic population transfer
Коллективы : Conference on High-Power Lasers in Energy Engineering (1999, Nov.; Osaka, Japan)
Место публикации : High-power lasers in energy engineering. Ser. Proceedings of the society of photo-optical instrumentation engineers (SPIE): SPIE-Int. Soc. Optical Engineering, 2000. - Vol. 3886. - P.699-703. - ISBN 0277-786X, DOI 10.1117/12.375171. - ISBN 0-8194-3484-1
Примечания : Cited References: 13
Предметные рубрики: ELECTROMAGNETICALLY INDUCED TRANSPARENCY
MULTILEVEL SYSTEMS
LASER-PULSES
Ключевые слова (''Своб.индексиров.''): adiabatic population transfer--electromagnetically induced transparency--counterintuitive pulse sequence
Аннотация: In this work the feature of spatio-temporal evolution of two partially overlapped short pulses of counterintuitive sequence in a medium of three-level absorbing atoms in conditions of adiabatic transfer of population are investigated. The analytic solution is constructed. It is shown, that selective excitation of two-photon resonant state with a near-unity probability is conserved on the length of medium, which is considerably greater than the absorbtion length of a weak probe pulse in the absence of a coupling pulse at the adjacent transition.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Deng J., Zhang H., Zhang X., Molokeev M. S., Qiu J., Liu Y., Lei B., Ma L., Wang X.
Заглавие : Enhanced luminescence performance of CaO:Ce3+,Li+,F- phosphor and its phosphor-in-glass based high-power warm LED properties
Место публикации : J. Mater. Chem. C. - 2018. - Vol. 6, Is. 15. - P.4077-4086. - ISSN 20507534 (ISSN), DOI 10.1039/c8tc00813b
Примечания : Cited References: 44. - The present study was supported by the National Natural Science Foundation of China (Grant No. 21671070), the Project for Construction of High-level University in Guangdong Province, the Teamwork Projects funded by the Guangdong Natural Science Foundation (Grant No. S2013030012842), the Guangzhou Science & Technology Project (No. 201704030086) and the Open Project Fund from Key Laboratory of Advanced of Materials of Yunnan Province (No. 2018KF01).
Ключевые слова (''Своб.индексиров.''): correlated color temperature--critical concentration--doping concentration--enhanced luminescence--high color rendering index--high power white led--high temperature solid-state reaction--thermal and chemical stabilities
Аннотация: To obtain white light-emitted diodes (wLEDs) with a low correlated color temperature (CCT) and a high color rendering index (CRI), red-emission is indispensable in their emission spectra. Herein, CaO:Ce3+,Li+,F- yellow phosphors with more red spectral component have been prepared via a high temperature solid-state reaction. As compared to the F- undoped samples, CaO:Ce3+,Li+,F- phosphor have lower critical doping concentration of Ce3+ and show stronger luminescence. At the critical concentration, a quantum efficiency of 66.4% and enhanced thermal and chemical stability were obtained in CaO:Ce3+,Li+,F-. Furthermore, a CaO:Ce3+,Li+,F--based phosphor-in-glass (PiG) using the red-emitting glass system with the composition of SiO2-Na2CO3-Al2O3-CaO:Eu3+ as the host material was constructed and used for high-power white LED applications. Such PiG samples with different phosphor doping concentrations can satisfy various light color demands and display higher reliability than the CaO:Ce3+,Li+,F- phosphor. An optimal PiG-based wLED exhibits color coordinates of (0.3769, 0.3386), a CCT of 3774 K, a CRI of 82.5 and a LE of 73.1 when the mass ratio of phosphor to glass matrix was 7:50 in PiG. Moreover, such PiG-based wLED also showed acceptable color stability under different drive currents. All the above results demonstrate that CaO:Ce3+,Li+,F- can be expected to be a potential alternative yellow phosphor for blue light excited PiG based warm wLEDs, particularly for high-power devices.
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