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A high-selectivity waveguide bandpass filter with interference suppression by more than 120 dB in rejection band / B. A. Belyaev, A. M. Serzhantov, An. A. Leksikov [et al.] // Tech. Phys. Lett. - 2023. - Vol. 49, Is. 5. - P. 72-76, DOI 10.21883/TPL.2023.05.56034.19541. - Cited References: 10. - This study was carried out under agreement No. 470 dated August 30, 2022, between the Kirensky Institute of Physics (Siberian Branch, Russian Academy of Sciences), the Regional Science Foundation, and ”AO ”NPP ”Radiosvyaz“ as part of a competitive tender of research-andengineering and innovative projects for the first climatological research and education center ”Yenisey Siberia“ . - ISSN 1063-7850. - ISSN 1090-6533
Кл.слова (ненормированные):
bandpass filter -- waveguide -- resonator -- cross-coupling
Аннотация: The design of a 10th-order waveguide bandpass filter with an additional inductive cross-coupling between non-adjacent resonators has been proposed and studied. An inductive coupling is formed by a U-shaped conductor structure with grounded ends that is formed in the filter cover. This method of cross-coupling organization ensures not only the temperature stability of the characteristics, but also the manufacturability of the structure. The high selectivity of the device is achieved by both the attenuation poles located near the passband, as well as the level of suppression in the stopbands, exceeding 120 dB. The passband loss of the fabricated filter is ~ 0.8 dB at its central frequency f0=18.2 GHz and relative bandwidth Δf/f0=1.5%. The small dimensions (135 x 30 x 10 mm) and the weight of about 200 g of the device, with simultaneously high electrical characteristics show the promise of its use, for example, in on-board and ground-based space communication systems.

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Публикация на русском языке Высокоселективный волноводный полосно-пропускающий фильтр с уровнем подавления помех более 120 dB [Текст] / Б. А. Беляев, А. М. Сержантов, Ан. А. Лексиков [и др.]. - 6 с. // Письма в ЖТФ. - 2023. - Т. 49 Вып. 10. - С. 33-38

Держатели документа:
Reshetnev Siberian State Aerospace University, Krasnoyarsk, Russia
Siberian Federal University, Krasnoyarsk, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia

Доп.точки доступа:
Belyaev, B. A.; Беляев, Борис Афанасьевич; Serzhantov, A. M.; Сержантов, Алексей Михайлович; Leksikov, An. A.; Лексиков, Андрей Александрович; Bal'va, Ya. F.; Бальва, Ярослав Федорович; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Galeev, R. G
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Aplesnin, S. S.
Influence of spin-phonon coupling on the magnetic moment in 2D spin-1/2 antiferromagnet / S. S. Aplesnin // Phys. Lett. A. - 2003. - Vol. 313, Is. 1-2. - P. 122-125, DOI 10.1016/S0375-9601(03)00689-3. - Cited References: 17 . - ISSN 0375-9601

РУБ Physics, Multidisciplinary
Рубрики:
SQUARE LATTICE
EU2CUO4
MODEL
Кл.слова (ненормированные):
2D Heisenberg model -- spin-phonon interactions -- 2D Heisenberg model -- Spin-phonon interactions -- ferromagnetic material -- anisotropy -- article -- liquid -- magnetism -- mathematical model -- Monte Carlo method -- quantum theory -- thermal conductivity -- vibration
Аннотация: The ground state of two-dimensional Heisenberg spin-1/2 antiferromagnet (AF) with the spin-phonon coupling is studied by the quantum Monte Carlo method. The magnetic moment per site, mean-square vibration of ion, phase diagram of AF long range order-quantum spin. liquid are simulated. The spin-phonon coupling is estimated for R2CuO4, R = Gd, Eu. (C) 2003 Elsevier Science B.V. All rights reserved.

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Держатели документа:
LV Kirenskii Inst Phys, Russian Acad Sci, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
L. V. Kirenskii Institute of Physics, Siberian Br. of Russ. Acad. of Sci., Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Аплеснин, Сергей Степанович
}
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Aplesnin, S. S.
Static and dynamic magnetic properties of coupled spin-1/2 antiferromagnetic chains / S. S. Aplesnin // J. Phys.: Condens. Matter. - 2000. - Vol. 12, Is. 37. - P. 8191-8207, DOI 10.1088/0953-8984/12/37/316. - Cited References: 21 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
ONE-DIMENSIONAL ANTIFERROMAGNETS
   SYSTEMS
   SUSCEPTIBILITY
   EXCITATIONS
   SR2CUO3
   CA2CUO3
   KCUF3
Кл.слова (ненормированные):
Computational methods -- Copper compounds -- Correlation methods -- Functions -- Magnetic field effects -- Magnetic properties -- Magnetization -- Monte Carlo methods -- Quantum theory -- Specific heat -- Thermal effects -- Excitation spectroscopy -- Interchain coupling -- Intrachain couplings -- Mean-field approximation -- Spin-spin correlation function -- Spinons -- Antiferromagnetic materials
Аннотация: Calculations of the thermodynamic quantities, and the spectra of spinons, triplet excitations, and two-particle spin-singlet (Delta S-z = 0, +/- 1) excitations for a weakly coupled antiferromagnetic S = 1/2 spin chain are made using a mean-field approximation for the interchain couplings (J(2)) by the quantum Monte Carlo method. The mass gaps in these excitation spectra are estimated as functions of the interchain coupling. The critical held H-c, and the temperatures at which the spinon and singlet gaps close (T-1 and T-2, respectively) are obtained. Some peculiarities of the staggered magnetization, the specific heat, and the spin-spin correlation function are found at T-1 = 0.9J(2), T-2 = 1.5J(2), H-c = 3.8J(2), as determined by linear function fitting for J(2)/J(1) < 0.15 The intrachain and interchain couplings, and the staggered magnetization for KCuF3, Sr2CuO3, and Ca2CuO3 are estimated, and mass gaps are predicted to exist in the spectra of the spinons and the singlet two-particle excitations.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
L V Kirensky Institute of Physics, Siberian Br. Russ. Acad. of Sci., Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Аплеснин, Сергей Степанович
}
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Aver'yanov, E. M.
Nonlinear coupling between the mean polarizability (gamma)over-bar of molecules and the local-field anisotropy in a liquid crystal and change of the "(gamma)over-bar = const" paradigm / E. M. Aver'yanov // JETP Letters. - 2008. - Vol. 87, Is. 5. - P. 258-261 ; JETP Letters. - 2008. - Vol. 87, Is. 5. - P. 258-261, DOI 10.1134/S002136400805007X. - Cited References: 14 . - ISSN 0021-3640. - Вариант Sopus

РУБ Physics, Multidisciplinary
Рубрики:
REFRACTIVE-INDEXES
ORDER
Аннотация: The nonlinear relation between the mean effective polarizability (gamma) over bar of molecules and the local-field anisotropy in uniaxial liquid crystals is demonstrated. Stringent constraints on (gamma) over bar from below, indicative of the dependence of on the liquid-crystal state and the change of the "(gamma) over bar = const" paradigm, are established. The theoretical results are confirmed by experiments with nematic liquid crystals having high and low birefringences.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Аверьянов, Евгений Михайлович

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BCS-type Theory for the Sum of Magnetic and Phonon Coupling in high-Tc Cuprates / E. Shneyder, S. Ovchinnikov // 18th International Conference on Magnetism (ICM-2009). - 2009. - Ст. Mo-A-5.1-03

Доп.точки доступа:
Shneyder, E.; Ovchinnikov, S.; International Conference on Magnetism(18 ; 2009 ; July 26-31 ; Karlsruhe, Germany)
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    Belyaev, B. A.
    Design of bandpass filters composed of dielectric layers separated by gratings of strip conductors / B. A. Belyaev, V. V. Tyurnev // Opt. Lett. - 2016. - Vol. 41, Is. 3. - P. 536-539, DOI 10.1364/OL.41.000536. - Cited References:14. - Ministry of Education and Science of the Russian Federation (14.607.21.0039). . - ISSN 0146-9592. - ISSN 1539-4794
   Перевод заглавия: Конструирование полосно-пропускающих фильтров, состоящих из диэлектрических слоев, разделенных решетками полосковых проводников

РУБ Optics
Рубрики:
Coupling-coefficients
   Multilayer structure
   Resonators
   Formulas
Аннотация: We derive the design formulas for novel multilayer bandpass filters in which every dielectric layer (resonator) is separated from the adjacent layer or external medium by a grating of strip conductors. Every grating acts as a semireflecting mirror. Such novel filters have wide stop bands compared to conventional filters with multilayer dielectric mirrors between resonators at the same passband width. The parameters of the lowpass, lumped-element prototype filter, as well as the theory of resonator-coupling coefficients, are considered in our approach. The computed frequency response of the fifth-order Chebyshev filter that was synthesized using the proposed formulas is also presented.

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Держатели документа:
LV Kirensky Inst Phys SB RAS, 50-38 Akademgorodok Str, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, 79 Svobodny Ave, Krasnoyarsk 660041, Russia.
Siberian State Aerosp Univ, 31 Krasnoyarsky Rabochy Ave, Krasnoyarsk 660014, Russia.

Доп.точки доступа:
Tyurnev, V. V.; Тюрнев, Владимир Вениаминович; Беляев, Борис Афанасьевич; Ministry of Education and Science of the Russian Federation [14.607.21.0039]
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Bulgakov, E. N.
Correlated behavior of conductance and phase rigidity in the transition from the weak-coupling to the strong-coupling regime / E. N. Bulgakov, I. . Rotter, A. F. Sadreev // Phys. Rev. B. - 2007. - Vol. 76, Is. 21. - Ст. 214302, DOI 10.1103/PhysRevB.76.214302. - Cited References: 42 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
OPEN QUANTUM-SYSTEMS
   NUCLEAR CROSS-SECTIONS
   UNIFIED THEORY
   FLUCTUATIONS
   CONTINUUM
   BILLIARD
   STATES
Аннотация: We study the transmission through different small systems as a function of the coupling strength v to the two attached leads. The leads are identical with only one propagating mode xi(E)(C) in each of them. In addition to the conductance G, we calculate the phase rigidity rho of the scattering wave function Psi(E)(C) in the interior of the system. Most interesting results are obtained in the regime of strongly overlapping resonance states where the crossover from staying to traveling modes takes place. The crossover is characterized by collective effects. Here, the conductance is plateaulike enhanced in some energy regions of finite length while corridors with zero transmission (total reflection) appear in other energy regions. This transmission picture depends only weakly on the spectrum of the closed system. It is caused by the alignment of some resonance states of the system with the propagating modes xi(E)(C) in the leads. The alignment of resonance states takes place stepwise by resonance trapping, i.e., it is accompanied by the decoupling of other resonance states from the continuum of propagating modes. This process is quantitatively described by the phase rigidity rho of the scattering wave function. Averaged over energy in the considered energy window, G is correlated with 1-rho . In the regime of strong coupling, only two short-lived resonance states survive each aligned with one of the channel wave functions xi(E)(C). They may be identified with traveling modes through the system. The remaining M-2 trapped narrow resonance states are well separated from one another.

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Держатели документа:
[Bulgakov, E. N.
Rotter, I.
Sadreev, A. F.] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
[Bulgakov, E. N.
Sadreev, A. F.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Max Planck Institute for the Physics of Complex Systems, D-01187 Dresden, Germany
Kirensky Institute of Physics, 660036, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Rotter, I.; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич
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Calculation of thermostable directions and the influence of bias electricfield on the propagation of the Lamb and SH waves in langasite single crystalplates / S. I. Burkov [et al.] // Proceedings - IEEE Ultrasonics Symposium. - 2010. - Ст. 5935458. - P. 1853-1856, DOI 10.1109/ULTSYM.2010.5935458 . - ISBN 1051. - ISBN 9781457703829
Кл.слова (ненормированные):
dc electric field influence -- Lamb wave -- SH-wave -- thermostability -- Bias electric fields -- Dc electric field -- Lamb Wave -- Langasite crystals -- Langasites -- SH wave -- Single-crystal plates -- Temperature coefficient -- thermostability -- Computer simulation -- Electromechanical coupling -- Shear waves -- Single crystals -- Ultrasonics -- Electric fields -- Electric fields -- Shear waves
Аннотация: Paper is presented the results of computer simulation. Effect of the dcelectric field influence on the propagation of Lamb and SH waves and itstemperature coefficients of delay in piezoelectric langasite crystal plate for alot of cuts and directions have been calculated. There were found the cutspossessing the thermostability and sufficient electromechanical coupling. В©2010 IEEE.

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Доп.точки доступа:
Burkov, S. I.; Zolotova, O. P.; Turchin, P. P.; Sorokin, B. P.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; IEEE International ultrasonics symposium(2010 ; Oct. ; 11-14 ; San Diego, CA)
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    Catalytic properties and nature of active centers of ferrospheres in oxidative coupling of methane / A. G. Anshits [et al.] // Appl. Catal. A-Gen. - 2016. - Vol. 524. - P. 192-199, DOI 10.1016/j.apcata.2016.06.032. - Cited References:47. - This study was supported by the Russian Science Foundation (project no. 14-13-00289). . - ISSN 0926-860X. - ISSN 1873-3875
   Перевод заглавия: Каталитические свойства и природа активных центров ферросфер в оксидативной связи метана

РУБ Chemistry, Physical + Environmental Sciences
Рубрики:
GLASS CRYSTAL CATALYSTS
   MAGNETIC-PROPERTIES
   PROFILE REFINEMENT
   FLY-ASH
   MOSSBAUER
   MICROSPHERES
   PERFORMANCE
   CONVERSION
   ETHYLENE
   OXIDE
Кл.слова (ненормированные):
Methane coupling -- Active center -- Ferrospinel -- Mossbauer spectroscopy
Аннотация: Ferrospheres with the Fe2O3 content in the range from 76 to 97 wt% were applied as catalysts for the oxidative coupling of methane (OCM). To identify their phase composition and distribution of iron sites, the ferrospheres were characterized by X-ray powder diffraction and Mossbauer spectroscopy before and after the OCM reaction. Magnetite-based ferrite spinel, hematite and aluminosilicate glasses were established to be the main phases. The ferrospinel of all ferrospheres partially oxidized to hematite after the OCM reaction. It was established that the yield of C-2-hydrocarbons sharply increased at the ferrospheres with Fe2O3 content higher than 89 wt% The spinel phase of these ferrospheres includes Fevv3+(B) sites with a Ca2+ tetrahedral cation and an octahedral cation vacancy among the nearest neighbors. A linear correlation between the yield of C-2-hydrocarbons (ethane and ethylene) and the content of such sites was established, thus indicating that their electrophilic oxygen species participate in selective CH4 conversion to C2H6. (C) 2016 Elsevier B.V. All rights reserved.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Akad Gorodok 50-24, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Akad Gorodok 50-38, Krasnoyarsk 660036, Russia.
Univ Rostock, Leibniz Inst Katalyse eV, Albert Einstein Str 29 a, D-18059 Rostock, Germany.

Доп.точки доступа:
Anshits, A. G.; Bayukov, O. A.; Баюков, Олег Артемьевич; Kondratenko, E. V.; Anshits, N. N.; Pletnev, O. N.; Плетнев, Олег Николаевич; Rabchevskii, E. V.; Solovyov, L. A.; Russian Science Foundation [14-13-00289]
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10.

Catalyzed M–C coupling reactions in the synthesis of σ-(pyridylethynyl)dicarbonylcyclopentadienyliron complexes / V. V. Verpekin, O. V. Semeikin, A. D. Vasiliev [et al.] // RSC Adv. - 2020. - Vol. 10, Is. 29. - P. 17014-17025, DOI 10.1039/d0ra02333g. - Cited References: 86. - This research was funded by a grant from the Russian Science Foundation (project No. 18-73-00150). . - ISSN 2046-2069

РУБ Chemistry, Multidisciplinary
Рубрики:
NONLINEAR-OPTICAL PROPERTIES
METAL ALKYNYL COMPLEXES
CARBON BOND FORMATION
Аннотация: The reactions between terminal ethynylpyridines, (trimethylsilyl)ethynylpyridines and cyclopentadienyliron dicarbonyl iodide were studied under Pd/Cu-catalyzed conditions to develop a synthetic approach to the σ-alkynyl iron complexes Cp(CO)2Fe–C≡C–R (R = ortho-, meta-, para-pyridyl). Depending on the catalyst and reagents used, the yields of the desired σ-pyridylethynyl complexes varied from 40 to 95%. In some cases the reactions with ortho-ethynylpyridine gave as byproduct the unexpected binuclear FePd μ-pyridylvinylidene complex [Cp(CO)Fe{μ2-η1(Cα):η1(Cα)-κ1(N)-Cα=Cβ(H)(o-C5H4N)}(μ-CO)PdI]. The conditions, catalysts, and reagents that provide the highest yields of the desired σ-pyridylethynyl iron compounds were determined. The methods developed allowed the synthesis of the corresponding σ-4-benzothiadiazolylethynyl complex Cp(CO)2Fe–C≡C–(4-C6H3N2S) as well. Eventually, synthetic approaches to σ-alkynyl iron complexes of the type Cp(CO)2Fe–C≡C–R (R = ortho-, meta-, para-pyridyl, 4-benzothiadiazol-2,1,3-yl) based on the Pd/Cu-catalyzed cross-coupling reactions were elaborated.

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Держатели документа:
Russian Acad Sci, Krasnoyarsk Res Ctr, Siberian Branch, Inst Chem & Chem Technol, Akademgorodok 50-24, Krasnoyarsk 660036, Russia.
Russian Acad Sci, AN Nesmeyanov Inst Organoelement Cpds, Ul Vavilova 28, Moscow 119991, Russia.
Russian Acad Sci, Siberian Branch, Krasnoyarsk Res Ctr, Inst Phys, Akademgorodok 50-38, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Sobodny Prospect 79, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Verpekin, Victor V.; Semeikin, Oleg, V; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Kondrasenko, Alexander A.; Belousov, Yu. A.; Ustynyuk, Nikolai A.; Russian Science FoundationRussian Science Foundation (RSF) [18-73-00150]
}
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