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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Khodenkov S. A., Shabanov V. F.
Заглавие : Investigation of frequency-selective devices based on a microstrip 2D photonic crystal
Коллективы : Ministry of Education and Science of the Russian Federation; Russian Federation [MK-5942.2014.8]
Место публикации : Dokl. Phys.: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 61, Is. 4. - P.155-159. - ISSN 1028-3358, DOI 10.1134/S1028335816040017. - ISSN 1562-6903(eISSN)
Примечания : Cited References:8. - This study was supported by the Ministry of Education and Science of the Russian Federation and grant MK-5942.2014.8 of the President of the Russian Federation for State Support of Young Russian Scientists.
Предметные рубрики: Bandpass-filters
Models
Аннотация: The frequency-selective properties of structures based on a 2D microstrip photonic crystal have been investigated theoretically and experimentally. It is shown that various microwave devices, including diplexers, bandpass filters, and double bandpass filters, can be designed based on these structures.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : GEKHT R. S.
Заглавие : MAGNETIC-STRUCTURES AND PROPERTIES OF STATES IN STRONGLY FRUSTRATED HEISENBERG ANTIFERROMAGNETS
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz.: MEZHDUNARODNAYA KNIGA, 1992. - Vol. 102, Is. 6. - P1968-1982. - ISSN 0044-4510
Примечания : Cited References: 23
Предметные рубрики: PHASE-TRANSITIONS
SPIN
LATTICE
MODELS
LONG
Аннотация: The magnetic structures and properties of states in frustrated Heisenberg antiferromagnets are analyzed. It is shown that frustrations induced due to additional spins in the system lead to a large variety of phase with the commensurable and uncommensurable periods and also to arising nonperiodical phases. The energy spectrum of states is studied. It is found that in the large region of the frustration parameter variation the modulated phase (0, Q) is unstable. The phase diagram of states is found and the region of local degeneration for some structures is indicated.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zobov V. E.
Заглавие : Singular points of time-dependent correlation functions of spin systems on large-dimensional lattices at high temperatures
Место публикации : Theor. Math. Phys.: PLENUM PUBL CORP, 2000. - Vol. 123, Is. 1. - P511-523. - ISSN 0040-5779, DOI 10.1007/BF02551058
Примечания : Cited References: 21
Предметные рубрики: BRANCHED POLYMERS
HEISENBERG MAGNET
EXPANSION
MODELS
Аннотация: Time-dependent autocorrelation functions are investigated for the Heisenberg model with spins 1/2 on d-dimensional simple cubic lattices of large dimensions d at infinite temperature. The autocorrelation function on the imaginary time axis is interpreted as the generating function of bond trees constructed with double bonds. These trees provide the leading terms with respect to lid for the time-expansion coefficients of the autocorrelation function. The correction terms from branch intersections to the generating function in the Bethe approximation are derived for these trees. A procedure is suggested for finding the correction to the coordinate of the singular point of the generating function (i.e., to the reciprocal of the branch growth-rate parameter) from the above correction terms without calculating the number of trees. The leading correction terms of order 1/sigma(2) (where sigma = 2d - 1) are found for the coordinates of the singular points of the autocorrelation function in question and for the generating function of the trees constructed with single bonds in the Eden model.
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