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1.
V. P. Koshelets S. V. Shitov L. V. Filippenko P. N. Dmitriev A. N. Ermakov A. S. Sobolev M. Yu. Torgashin 《Radiophysics and Quantum Electronics》2003,46(8-9):618-630
We overview recent achievements in the field of cryogenic submillimeter-wave receivers based on superconductor–insulator–superconductor (SIS) tunnel junctions. The main attention is paid to the novel superconducting integrated receivers (SIRs) with an on-chip superconducting local oscillator. The single-chip microcircuit of the receiver, which integrates a quantum mixer based on the nonlinearity of a quasi-particle current in the SIS junction, a planar superconducting receiving antenna, and a cryogenic local oscillator, is described. Being dc-powered only by batteries, such a microcircuit operates as a submillimeter-wave superheterodyne receiver without any additional microwave equipment. Such receivers are very attractive for radioastronomical research, space communication systems, and monitoring of the environment from satellites, balloons, and special aircraft. A breadboard of a superconducting spectrometer with a phase-locked flux-flow oscillator (FFO) has been developed and tested. A frequency resolution better than 10 kHz was reached at a frequency of 365 GHz. We describe a balloon-borne 500-650 GHz integrated spectrometer for oblique atmospheric sounding, developed for the international Terahertz Limb Sounder (TELIS) project. The first flight is scheduled for 2005. 相似文献
2.
Russian Chemical Bulletin - For the first time, O-methyl and O-ethyl esters of dinitromethane were isolated in an individual state. Their structures were confirmed by spectral methods, elemental... 相似文献
3.
Ya. N. Shitov 《Doklady Mathematics》2015,92(3):707-708
Results related to extended formulations for convex polygons are discussed. In particular, it turns out that six linear inequalities are sufficient to describe a convex heptagon up to linear projection. 相似文献
4.
Physics of Atomic Nuclei - Some results obtained by E.E. Saperstein and his coauthors in the theory of the ground state and low-lying excited states of magic and semimagic nuclei are... 相似文献
5.
Yaroslav Shitov 《Linear algebra and its applications》2011,435(7):1769-1777
The rank-sum, rank-product, and rank-union inequalities for Gondran-Minoux rank of matrices over idempotent semirings are considered. We prove these inequalities for matrices over quasi-selective semirings without zero divisors, which include matrices over the max-plus semiring. Moreover, it is shown that the inequalities provide the linear algebraic characterization for the class of quasi-selective semirings. Namely, it is proven that the inequalities hold for matrices over an idempotent semiring S without zero divisors if and only if S is quasi-selective. For any idempotent semiring which is not quasi-selective it is shown that the rank-sum, rank-product, and rank-union inequalities do not hold in general. Also, we provide an example of a selective semiring with zero divisors such that the rank-sum, rank-product, and rank-union inequalities do not hold in general. 相似文献
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The drift motion of a 180° domain boundary in garnet ferrites with two nonequivalent sublattices is studied in an elastic stress field induced by an acoustic wave propagating in the domain boundary plane. The dependences of the drift velocity on the amplitude and polarization of the acoustic wave are obtained, and the drift motion conditions for a strip domain structure are determined. 相似文献
8.
Baksht E. Kh. Erofeev M. V. Tarasenko V. F. Solomonov V. I. Shitov V. A. 《Russian Physics Journal》2021,63(9):1649-1649
Russian Physics Journal - To the article “Yttrium Sesquioxide Ceramics Glow under Irradiation with an Electron Beam,” by E. Kh. Baksht, M. V. Erofeev, V. F. Tarasenko, M. I. Solomonov,... 相似文献
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The tropical arithmetic operations on R are defined by a⊕b=min{a,b} and a⊗b=a+b. Let A be a tropical matrix and k a positive integer, the problem of Tropical Matrix Factorization (TMF) asks whether there exist tropical matrices B∈Rm×k and C∈Rk×n satisfying B⊗C=A. We show that the TMF problem is NP-hard for every k≥7 fixed in advance, thus resolving a problem proposed by Barvinok in 1993. 相似文献