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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 журнала
Шифр издания :
Автор(ы) : Udod L. V., Aplesnin S. S., Sitnikov M. N., Romanova O. B.
Заглавие : Investigation of the magnetoelectric effect and thermoelectric power of the composite of iron-substituted bismuth pyrostannate Bi2(Sn0.7Fe0.3)2O7/Bi2Fe4O9
Колич.характеристики :7 с
Место публикации : Phys. Solid State. - 2023. - Vol. 65, Is. 8. - P.1305-1311. - ISSN 10637834 (ISSN), DOI 10.21883/PSS.2023.08.56576.83. - ISSN 10906460 (eISSN)
Примечания : Cited References: 45
Аннотация: The composite compound Bi2(Sn0.7Fe0.3)2O7/Bi2Fe4O9 in the ratio 91/9% was synthesized by the solid-phase reaction method. The current-voltage characteristics were studied in the temperature range 800–400 K. The hysteresis of the current-voltage characteristics was found. The magnetoelectric interaction and thermoelectric power have been studied. The temperatures of predominance of the even and linear functions of the magnetoelectric effect are established. The sign change of the thermopower has been found.
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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
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Автор(ы) : Hu T., Ning L., Gao Y., Qiao J., Song E., Chen Z., Zhou Y., Wang J., Molokeev M. S., Ke X., Xia Z., Zhang Q.
Заглавие : Glass crystallization making red phosphor for high-power warm white lighting
Место публикации : Light Sci. Appl. - 2021. - Vol. 10, Is. 1. - Ст.56. - ISSN 20955545 (ISSN), DOI 10.1038/s41377-021-00498-6
Примечания : Cited References: 50. - The present work was supported by the National Natural Science Foundations of China (Grant Nos. 51972118, 51961145101, 51722202 and 11974022), the Guangzhou Science & Technology Project (202007020005), the Fundamental Research Funds for the Central Universities (D2190980), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01X137)
Аннотация: Rapid development of solid-state lighting technology requires new materials with highly efficient and stable luminescence, and especially relies on blue light pumped red phosphors for improved light quality. Herein, we discovered an unprecedented red-emitting Mg2Al4Si5O18:Eu2+ composite phosphor (λex = 450 nm, λem = 620 nm) via the crystallization of MgO–Al2O3–SiO2 aluminosilicate glass. Combined experimental measurement and first-principles calculations verify that Eu2+ dopants insert at the vacant channel of Mg2Al4Si5O18 crystal with six-fold coordination responsible for the peculiar red emission. Importantly, the resulting phosphor exhibits high internal/external quantum efficiency of 94.5/70.6%, and stable emission against thermal quenching, which reaches industry production. The maximum luminous flux and luminous efficiency of the constructed laser driven red emitting device reaches as high as 274 lm and 54 lm W−1, respectively. The combinations of extraordinary optical properties coupled with economically favorable and innovative preparation method indicate, that the Mg2Al4Si5O18:Eu2+ composite phosphor will provide a significant step towards the development of high-power solid-state lighting.
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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) : Chen, Weibin, Zhang, Xuejie, Zhou, Jianxian, Zhang, Haoran, Zhuang, Jianle, Xia, Zhiguo, Liu, Yingliang, Molokeev M. S., Xie, Gening, Lei, Bingfu
Заглавие : Glass-ceramics with thermally stable blue-red emission for high-power horticultural LED applications
Место публикации : J. Mater. Chem. C. - 2020. - Vol. 8, Is. 12. - P.3996-4002. - ISSN 2050-7526, DOI 10.1039/d0tc00061b. - ISSN 2050-7534(eISSN)
Примечания : Cited References: 36. - The present work was supported by the National Natural Science Foundations of China (Grant No. 21671070); the Project of GDUPS (2018) for Prof. Bingfu LEI; the Guangzhou Science & Technology Project, China (No. 201704030086); and the National Undergraduate Innovation and Entrepreneurship Training Program grant for Gening Xie (No. 201910564035).
Предметные рубрики: PLANT-GROWTH
ENERGY-TRANSFER
CARBON DOTS
PHOSPHOR
LIGHT
Аннотация: As one of the key elements of indoor agriculture, horticultural light sources are developing rapidly towards requiring high energy density, high output power and high stability, which poses a challenge for traditional phosphor conversion devices. To address this, an all-inorganic blue-red dual-emitting light convertor consisting of Ba1.3Sr1.7MgSi2O8:Eu2+,Mn2+ (BSMS) phosphor-in-glass (PiG) plates was prepared to improve the duration lifetime of converted high-power light-emitting diodes (LEDs) and meet the light quality requirements of photosynthesis for indoor agriculture. The obtained samples show an external quantum efficiency of 45.3%, outstanding thermal stability and a specific emission spectrum that highly matches the absorption of chlorophyll and β-carotene. Moreover, a proof-of-concept BSMS-PiG horticultural lamp for application in an indoor plant factory was successfully fabricated based on a ∼370 nm emitting LED chip. The blue-red ratio of its spectrum could be regulated by controlling the thickness of BSMS-PiG and the concentrations of Mn2+ ions within BSMS-PiG. The BSMS-PiG horticultural LEDs were applied to the indoor cultivation of Romaine lettuce. The results indicated that the biomass of Romaine lettuce was 58.21% greater than that of control lettuce samples cultivated under commercial plant lamps. In particular, the content values of total chlorophyll, β-carotene and soluble protein were improved. The BSMS-PiG horticultural LED is a potential candidate to act as a high-power horticultural light source.
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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 (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Stebeleva O. P., Kashkina L. V., Petrakovskaya E. A., Nikitin S. L., Valiullin T. R.
Заглавие : The impact of cavitation-activated water on combustion dynamics and environmental characteristics of coal-water slurry fuel
Коллективы : International Workshop on Advanced Technologies in Material Science, Mechanical and Automation Engineering
Место публикации : IOP Conf. Ser.: Mater. Sci. Eng. - 2019. - Vol. 537: International Workshop on Advanced Technologies in Material Science, Mechanical and Automation Engineering - MIP: Engineering-2019 (4 April 2019 through 6 April 2019) Conference code: 149243, Is. 6. - Ст.062056. - , DOI 10.1088/1757-899X/537/6/062056
Примечания : Cited References: 8
Предметные рубрики: Chemical, Ecological and Power Engineering
Аннотация: Among the new coal technologies the burning of low-grade coal in the form of coal-water slurry fuel (CWSF) is of a great interest. The basis of CWSF is a highly concentrated coal-water slurry consisting of finely ground coal, water or other liquid and plasticizing agents. The development of CWSF technology is highly relevant for solving global problems of resource conservation and ecology. The study is dedicated to CWSF properties with respect to Kansk-Achinsk coal and water. This paper presents the results of the influence of CWSF's preliminary cavitation water treatment on the combustion dynamics of fuel, (including the features of the combustion temperature trends, delayed ignition time and time of complete combustion) and on its environmental characteristics. A rotary-type hydrodynamic oscillator at high angular velocity (10000 rpm) was used in supercavitation mode. It is shown that the technology of cavitation water treatment leads to a change in the dynamics of CWSF's combustion and to an additional decrease in NOx emissions by 1.6 times, CO2 by 1.3 times.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Bolyachkin A. S., Komogortsev S. V.
Заглавие : Power-law behavior of coercivity in nanocrystalline alloys with grain-size distribution
Коллективы : Российская академия наук, Уральское отделение РАН, Институт физики металлов им. М. Н. Михеева Уральского отделения РАН, Уральский федеральный университет им. первого Президента России Б.Н. Ельцина, Российский фонд фундаментальных исследований, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : Euro-asian symposium "Trends in magnetism" (EASTMAG-2019): Book of abstracts/ чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 2. - Ст.J.P3. - P.195-196. - ISBN 978-5-9500855-7-4 (Шифр В33/E12-125657784)
Примечания : Cited References: 4
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10.

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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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bolyachkin A. S., Komogortsev S. V.
Заглавие : Power-law behavior of coercivity in nanocrystalline magnetic alloys with grain-size distribution
Место публикации : Scripta Mater. - 2018. - Vol. 152. - P.55-58. - ISSN 13596462 (ISSN), DOI 10.1016/j.scriptamat.2018.04.008
Примечания : Cited References: 36. - This work was supported by RFBR (research project No. 17-302-50015), by MES of RF (contract No. 3.6121.2017/8.9) and by Act 211 Government of RF (agreement 02.A03.21.0006).
Ключевые слова (''Своб.индексиров.''): soft magnetic materials--random magnetic anisotropy model--exchange interaction
Аннотация: Coercivity of nanocrystalline magnetic alloys depends on the grain size D according to a power law Hc ∝ Dn with n from 2 to 6. The law Hc ∝ D6 is derived based on the random magnetic anisotropy model and is clearly manifested in experimental studies of some Finemet type alloys. In this letter using computer modeling it is demonstrated that a power-law behavior with the exponent n less than 6 can be due to a grain-size distribution. An increase of grain size variance results in a decrease of the exponent from 6 to the value of about 3.
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12.

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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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Komogortsev S. V., Iskhakov R. S.
Заглавие : Law of approach to magnetic saturation in nanocrystalline and amorphous ferromagnets with improved transition behavior between power-law regimes
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации : J. Magn. Magn. Mater.: Elsevier, 2017. - Vol. 440. - P.213-216. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2016.12.145
Примечания : Cited References: 41. - The work has been supported by Russian Foundation for Basic Research, Grant nos. 16-03-00256, 15-08-06673 and RFBR-KRFS 15–42-04171.
Ключевые слова (''Своб.индексиров.''): ferromagnetic materials--ferromagnetism--magnetic anisotropy--magnetism--magnets--nanocrystals--perturbation techniques--asymptotic regimes--law of approaches--nanocrystalline and amorphous--perturbation theory--power law regime--random magnetic anisotropies--transition behavior--transition modes--saturation magnetization
Аннотация: New law of the approach to magnetic saturation is proposed based on scaling in ferromagnets with random magnetic anisotropy. This law is consistent with the known laws derived within perturbation theory in extreme cases, but it describes the transition mode between the power-low asymptotic regimes better. The improved law is proper for reliable fitting the approach magnetization to saturation in nanocrystalline and amorphous ferromagnets. © 2017 Elsevier B.V.
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14.

Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Govorun I. V., Leksikov Al. A.
Заглавие : HTS microwave power limiter based on microstrip quarter-wave resonators
Коллективы : International Conference of Young Specialists on Micro/Nanotechnologies and Electron Devices
Место публикации : International Conference of Young Specialists on Micro/Nanotechnologies and Electron Devices, EDM: [29 June 2017 - 03 July 2017, Erlagol, Russia]: IEEE Computer Society, 2017. - P.80-82. - , DOI 10.1109/EDM.2017.7981712
Примечания : Cited References: 7. - The work was supported by the Ministry of Education and Science of the Russian Federation, grant Cn-3036.2016.3.of the President of the Russian Federation for State Support of Young Russian Scientists.
Ключевые слова (''Своб.индексиров.''): microstrip resonator--hts--power limiter--interaction of resonators
Аннотация: A microwave power limiter based on three-pole microstrip filter is designed, fabricated and tested. In the device outer resonators are coupled through an inner resonator containing high-temperature superconducting film. Prototype of the device with central frequency 8.3 GHz and relative bandwidth 7% has insertion loss 3 dB in the open state and signal suppression not less 35 dB in the limitation state.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chen M., Xia Z., Molokeev M. S., Lin C. C., Su C., Chuang Y. -C., Liu Q.
Заглавие : Probing Eu2+ luminescence from different crystallographic sites in Ca10M(PO4)7:Eu2+ (M = Li, Na, and K) with β-Ca3(PO4)2-type structure
Место публикации : Chem. Mater.: American Chemical Society, 2017. - Vol. 29, Is. 17. - P.7563-7570. - ISSN 08974756 (ISSN), DOI 10.1021/acs.chemmater.7b02724
Примечания : Cited References: 34. - The present work was supported by the National Natural Science Foundation of China (Grants 51722202, 91622125, and 51572023), Natural Science Foundations of Beijing (2172036), and Fundamental Research Funds for the Central Universities (FRF-TP-16-002A3). C.C.L. and C.C.S. acknowledge the financial support from the Ministry of Science and Technology of Taiwan (Contract No. MOST 104-2113-M-027-007-MY3), and M. Molokeev acknowledges support of the Russian Foundation for Basic Research (17-52-53031).
Ключевые слова (''Своб.индексиров.''): calcium--doping (additives)--excited states--light emission--lithium--luminescence--phosphors--photoluminescence--positive ions--rietveld refinement--single crystals--color tuning--crystallographic sites--different distributions--emission bands--local environments--long wavelength bands--luminescent centers--power diffraction data--europium
Аннотация: Eu2+ local environments in various crystallographic sites enable the different distributions of the emission and excitation energies and then realize the photoluminescence tuning of the Eu2+ doped solid state phosphors. Herein we report the Eu2+-doped Ca10M(PO4)7 (M = Li, Na, and K) phosphors with β-Ca3(PO4)2-type structure, in which there are five cation crystallographic sites, and the phosphors show a color tuning from bluish-violet to blue and yellow with the variation of M ions. The difference in decay rate monitored at selected wavelengths is related to multiple luminescent centers in Ca10M(PO4)7:Eu2+, and the occupied rates of Eu2+ in Ca(1), Ca(2), Ca(3), Na(4), and Ca(5) sites from Rietveld refinements using synchrotron power diffraction data confirm that Eu2+ enters into four cation sites except for Ca(5). Since the average bond lengths d(Ca-O) remain invariable in the Ca10M(PO4)7:Eu2+, the drastic changes of bond lengths d(M-O) and Eu2+ emission depending on the variation from Li to Na and K can provide insight into the distribution of Eu2+ ions. It is found that the emission band at 410 nm is ascribed to the occupation of Eu2+ in the Ca(1), Ca(2), and Ca(3) sites with similar local environments, while the long-wavelength band (466 or 511 nm) is attributed to Eu2+ at the M(4) site (M = Na and K). We show that the crystal-site engineering approach discussed herein can be applied to probe the luminescence of the dopants and provide a new method for photoluminescence tuning.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ikonnikov D. A., Voronov V. N., Molokeev M. S., Aleksandrovsky A. S.
Заглавие : Upconversion luminescence of CsScF4 crystals doped with erbium and ytterbium
Коллективы : Russian Foundation for Basic Research [15-52-53080]; Russian President [SS-7612.2016.2, 0358-2015-0012, II.2P]
Место публикации : Opt. Mater.: Elsevier Science, 2016. - Vol. 60. - P.584-589. - ISSN 0925-3467, DOI 10.1016/j.optmat.2016.09.016. - ISSN 1873-1252(eISSN)
Примечания : Cited References:33. - The authors are grateful to D. L. Chertkova for excellent technical assistance. The work was partially supported by the Russian Foundation for Basic Research Grant 15-52-53080, by the Russian President Grant SS-7612.2016.2, and by Project No0358-2015-0012 of SB RAS Program NoII.2P.
Предметные рубрики: MODULATED STRUCTURE
LANTHANIDE
NANOCRYSTALS
PHOSPHORS
Ключевые слова (''Своб.индексиров.''): fluoride crystals--erbium--ytterbium--up-conversion--luminescence--crystal structure--power dependence--pump wavelength dependence
Аннотация: Tetragonal CsScF4 crystals doped with (5 at.%) Er and Er/Yb (0.5 at.%/5 at.%) are grown and their crystal structure is determined to belong to Pmmn space group. Er and Yb ions are shown to occupy distorted octahedral Sc sites with the center of inversion. Bright visible upconversion luminescence was observed under 970-980 nm pumping with red (4F9/2), yellow (4S3/2) and green (2H11/2) bands of comparable intensity. UCL tuning curves maximize at 972 nm (CSF:Er) and at 969.7 nm (CSF:Er,Yb) pumping wavelengths. Different ratios between yellow-green and red luminescence intensities in CSF:Er and CSF:Er, Yb are explained by contribution of cross-relaxation in CSF:Er UCL UC in CSF:Er is a three stage process while UC in CSF:Er, Yb is a two stage process. The peculiarities of power dependences are explained by the power-dependent repopulation between starting levels of UC. (C) 2016 Elsevier B.V. All rights reserved.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Huang K.-C., Hsiao Yu-Cheng, Timofeev I. V., Zyryanov V. Ya., Lee W.
Заглавие : Photo-manipulated photonic bandgap devices based on optically tristable chiral-tilted homeotropic nematic liquid crystal
Место публикации : Opt. Express: Optical Society of America, 2016. - Vol. 24, Is. 22. - P.25019-25025. - ISSN 10944087 (ISSN), DOI 10.1364/OE.24.025019
Примечания : Cited References: 22. - Ministry of Science and Technology (MOST), (103-2923-M-009-003-MY3); Ministry of Education and Science of the Russian Federation (3.1276.2014/K); Siberian Branch of the Russian Academy of Sciences under Complex Program II.2P (0358-2015-0010, 0358-2015-0011).
Ключевые слова (''Своб.индексиров.''): defects--energy gap--liquid crystals--nematic liquid crystals--photonic crystals--spontaneous emission--homeotropic nematic liquid crystals--intensity modulators--low-power consumption--multi-channel filter--one dimensional photonic crystal--photonic application--photonic bandgap devices--transmission characteristics--light transmission
Аннотация: We report on the spectral properties of an optically switchable tristable chiral-tilted homeotropic nematic liquid crystal (LC) incorporated as a tunable defect layer in one-dimensional photonic crystal. By varying the polarization angle of the incident light and modulating the light intensity ratio between UV and green light, various transmission characteristics of the composite were obtained. The hybrid structure realizes photo-tunability in transmission of defect-mode peaks within the photonic bandgap in addition to optical switchability among three distinct sets of defect modes via photoinduced tristable state transitions. Because the fabrication process is easier and less critical in terms of cell parameters or sample preparation conditions and the LC layer itself possesses an extra stable state compared with the previously reported bistable counterpart operating on the basis of biased-voltage dual-frequency switching, it has much superior potential for photonic applications such as a low-power-consumption multichannel filter and an optically controllable intensity modulator. © 2016 Optical Society of America.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yakubailik E. K., Ganzhenko I. M., Butov P. Y., Kilin V. I.
Заглавие : Losses of magnetite iron in wet separation
Место публикации : Steel Transl.: Allerton Press Incorporation, 2016. - Vol. 46, Is. 6. - P.390-394. - ISSN 09670912 (ISSN), DOI 10.3103/S0967091216060115
Примечания : Cited References: 15
Ключевые слова (''Своб.индексиров.''): high-power magnets--iron losses--magnetic parameters--magnetite iron--tailings--wet separation
Аннотация: Samples of all the tailings from enrichment processes at the Abagur plant operated by OAO Evrazruda are studied. The tailings are subjected to magnetic and chemical analysis, and the magnetic characteristics of the products are measured. The mean magnetite iron content in the tailings was about 0.9% in 2013. Experiments confirm that the main magnetite losses are associated with small classes and their poor magnetic properties. The losses of magnetite are reduced as the separation field is increased. At the plant, 45% of the barium–ferrite magnetic systems in the PBM 90/250 separators have been replaced by a system based on neodymium–iron–boron composites, with increase in the field from 111 to 175 kA/m. Modernization of the magnetic systems in all the separators at the Abagur plant is recommended. In thickening, the installation of separators for regeneration of the suspensions, with a field of 190 kA/m, is recommended. After reconstruction, the losses of magnetite iron at the plant may be reduced to 0.45–0.55%. © 2016, Allerton Press, Inc.
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19.

Вид документа : Статья из журнала
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Автор(ы) : Belyaev B. A., Govorun I. V., Leksikov Al. A., Serzhantov A. M., Leksikov An. A.
Заглавие : Reflective power limiter for X-band with HTSC switching element
Место публикации : IEEE Trans. Appl. Supercond.: IEEE-Institute Electrical and Electronics Engineers, 2016. - Vol. 26, Is. 6. - Ст.1500506. - ISSN 1051-8223, DOI 10.1109/TASC.2016.2530700. - ISSN 1558-2515(eISSN)
Примечания : Cited References:23
Предметные рубрики: Superconducting transmission-line
Ключевые слова (''Своб.индексиров.''): microstrip structure--microwave (mw)--power limiter (pl)--transmission--zero
Аннотация: This paper presents a new type of power limiter (PL), using superconducting-to-normal state phase transition in high-temperature superconductor. The presented device differs from the existing ones mainly in the reflective principle of its operation. In fact, the PL is a three-resonator microstrip filter, whose resonators are configured and arranged in such a manner that coupling coefficient between the outer resonators is equal to zero and the inner one has a gap in the middle section shunted by a high-temperature superconducting (HTS) film element. In small-signal mode, the HTS element is in low-loss state, and the device is essentially a three-pole filter with low transmission loss. When the level of the signal exceeds the threshold, the HTS element transits to the high-loss state, and the Q-factor of the inner resonator falls, breaking the coupling in the structure. This leads to the corresponding increase in the PL's transmission loss due to reflection. The higher the level of incoming power, the more the Q-factor falls. The PL operating frequency is 8 GHz with 8.5% fractional bandwidth. It remains operable up to 40 W of input power, providing 38-dB limitation.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Говорун, Илья Валерьевич, Лексиков, Александр Александрович, Лексиков, Андрей Александрович, Сержантов, Алексей Михайлович
Заглавие : Исследование функционирования микрополоскового устройства защиты с ВТСП элементом в режимах повышенной мощности и кратковременных импульсов
Место публикации : Изв. вузов. Физика: Томский государственный университет, 2015. - Т. 58, № 8/2. - С. 126-128. - ISSN 0021-3411
Примечания : Библиогр.: 2. - Работа выполнена при поддержке Министерства образования и науки РФ, соглашение №14-607-21-0039
Ключевые слова (''Своб.индексиров.''): микрополосковый резонатор--втсп--устройство защиты--взаимодействие резонаторов--microstrip resonator--hts--protection device--interaction of resonators
Аннотация: Разработано и изготовлено устройство защиты на основе микрополосковых резонаторов форме гантели с переключающим элементом, выполненным из ВТСП тонкой пленки. Исследованы передаточные характеристики устройства при работе с сигналами до 40 Вт мощности, а также влияние на полосу пропускания длительности одиночного импульса сигнала разной мощности. Проведена экспериментальная оценка времени переключения в закрытый режим.A microstrip power limiter based on dumbbell-shaped resonators having a switcher made from high-temperature superconducting film was designed and fabricated. The transmission characteristics of the device were investigated in the case of microwave power level up to 40 W. An influence of single pulse duration of various magnitudes upon the passband of the device was investigated. An experimental estimation of the switch time to the closed mode was done.
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