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21.
I. V. Gravel A. A. Skibina A. N. Kuz’menko N. B. Demina I. I. KrasnyukJr. S. P. Zavadskiy A. V. Pirogov 《Moscow University Chemistry Bulletin》2017,72(4):192-195
The chemical composition of Asparagus racemosus roots is studied by the methods of gas chromatography and high-performance liquid chromatography. Marker substances characteristic of this type of raw materials are revealed. The dioscin content in the roots of A. racemosus is quantitatively determined. 相似文献
22.
A. A. Ostroushko M. O. Tonkushina A. P. Safronov V. Yu. Korotaev V. A. Vazhenin V. Yu. Kolosov N. A. Martynova I. B. Kutyashev S. G. Bogdanov A. N. Pirogov K. B. Grzhegorzhevskii A. V. Prokof’eva 《Russian Journal of Inorganic Chemistry》2012,57(6):858-863
Samples of polyoxometalate Mo72Fe30: [Mo72Fe30O252(CH3COO)12{Mo2O7(H2O)}2 {H2Mo2O8(H2O)}(H2O)91] · ??150H2O with a buckyball structure, which can be both crystalline and amorphous, were synthesized. It was shown that such samples can be studied by neutron diffraction. The stability of Mo72Fe30 to heating and UV light exposure (in poly(vinyl alcohol) and polyvinylpyrrolidone films) was studied by IR, EPR, and electronic absorption spectroscopy; thermal analysis; and mass spectrometry. Mo72Fe30 was found to be less stable to heating and irradiation in a poly(vinyl alcohol) film as compared with the related polyoxometallate Mo132 free of iron. The sorption properties of Mo72Fe30 to organic vapors and its stability under sorption conditions were studied. It was demonstrated that, in addition to sorption, organic substances cause the destruction of buckyballs. 相似文献
23.
Yu. F. Pirogov 《Physics of Atomic Nuclei》2010,73(1):134-137
The unimodular metagravity, with the graviscalar as a dark matter, is compared with General Relativity (GR) in the presence
of a scalar field. The effect of the graviscalar on the static spherically symmetric metric is studied. An exact limit solution
representing a new cosmic object, the (harmonic) graviscalar black hole, is given. The relation with the black hole in the
environment of a scalar field in GR is discussed. 相似文献
24.
V. G. Grebinnik V. N. Duginov V. A. Zhukov S. Kapusta A. B. Lazarev V. G. Olshevsky V. Y. Pomjakushin S. N. Shilov D. T. Bezhitadze I. I. Gurevich B. F. Kirillov E. P. Krasnoperov B. A. Nikolsky A. V. Pirogov A. N. Ponomarev V. A. Suetin G. F. Tavadze I. P. Borovinskaya M. D. Nersesyan A. G. Peresada Y. F. Eltzev V. R. Karasik O. E. Omelyanovsky 《Hyperfine Interactions》1990,61(1-4):1093-1096
We report the results of μSR investigations of the ceramic samples La2-xSrxCuO4-σ (x=0.1, 0.15, 0.25) and ReBa2Cu3O7-σ (Re=Er, Ho, Y0.5Ho0.5) in the external magnetic field 0–800 Oe. The measurements were performed by the ZFC and FC methods. The irreversibility effects were studied at several temperatures by measuring the mean value and the width of the magnetic field distribution on the muon in the step by step procedure of increasing and subsequent decreasing of the external field. The temperature dependences of the magnetic penetration depth perpendicular to the basal plane λ⊥ were obtained. For the lanthanum sample with 0.15 of Sr its value at the zero temperature is λ⊥ (0)=2400 Å, for Er-Ba-Cu-O λ⊥ (0)=1600 Å. 相似文献
25.
S. M. Matusova A. V. Pirogov T. B. Tennikova O. A. Shpigun 《Russian Journal of Applied Chemistry》2007,80(4):638-642
A series of monolithic macroporous sorbents based on glycidyl methacrylate and ethylene glycol dimethacrylate were prepared by free radical copolymerization. The effect of polymerization conditions and composition of reaction mixture on the pore structure of the monolithic material was studied by IR spectroscopy, intrusion mercury porosimetry, and scanning electron microscopy. 相似文献
26.
V. G. Grebinnik V. N. Duginov V. A. Zhukov S. Kapusta A. B. Lazarev V. G. Olshevsky V. Y. Pomjakushin S. N. Shilov I. I. Gurevich B. F. Kirillov B. A. Nikolsky A. V. Pirogov A. N. Ponomarev V. A. Suetin I. P. Borovinskaya M. D. Nersesyan A. G. Persada Y. F. Eltzev V. R. Kapasik O. E. Omelyanovski 《Hyperfine Interactions》1990,61(1-4):1085-1088
27.
B. P. Galapats E. Ya. Lyublinskii V. D. Pirogov A. I. Samsonova V. A. Shevchuk P. R. Shevchuk 《Journal of Mathematical Sciences》1993,64(3):914-920
We propose a method for the analytic computation and prediction of the lifetime of electrically nonconducting coatings in chemically active media. We study the role that the quantity of passivating additives in the coating and other parameters of the medium-coating-base system play in the destruction of the coating. We investigate the influence of passivating components on the process of corrosive destruction of the metal under the coating.Translated fromMatematicheskie Metody i Fiziko-Mekhanicheskie Polya, Issue 31, 1990, pp. 30–36. 相似文献
28.
V.V. Kabachenko Y.F. Pirogov 《The European Physical Journal C - Particles and Fields》1998,4(3):525-532
In the context of the future high energy – high luminosity electron and muon colliders, all the relevant four-lepton processes
with the lepton family violation (LFV) are systematically classified. The most general LFV effective lagrangians are found,
and the helicity differential cross sections for the LFV processes are calculated. The six- and eight-lepton Standard Model
(SM) backgrounds are discussed, and the LFV processes clean of the six-lepton background are picked out. The possibility to
suppress the six-lepton SM background, when present, by the unnatural initial beam polarizations is investigated. It is shown
that the four-lepton LFV processes are amenable to experimental study in the lepton-lepton collisions in the most favourable
cases up to the underlying scale of order TeV. Studying these processes should provide an essential part of the physics program for the next generation lepton colliders
to unravel the outstanding flavour/family problem.
Received: 20 October 1997 / Published online: 23 February 1998 相似文献
29.
E. A. Sherstobitova A. F. Gubkin A. A. Ermakov A. V. Zakharov N. V. Baranov Yu. A. Dorofeev A. N. Pirogov A. A. Podlesnyak V. Yu. Pomyakushin 《Physics of the Solid State》2006,48(7):1321-1327
The Tm1?x TbxCo2 (0 ≤ x ≤ 1) system was studied by measuring the magnetic susceptibility, electrical resistance, and neutron diffraction. In the compounds with 0 < x ≤ 0.15, an inhomogeneous magnetic state characterized by the existence of large regions (up to 100 Å in size) with short-range ferrimagnetic order was found to occur. The maximum of the residual electrical resistance observed in the compound with x = 0.1 at the magnetic ordering temperature was established to be due to the scattering of conduction electrons by localized spin fluctuations associated with f-d exchange fluctuations caused by the substitution of terbium for thulium. The increase in the terbium concentration to x ≥ 0.15 leads to a sharp increase in the Co sublattice magnetization and the establishment of a long-range ferromagnetic order, which indicates a concentration metamagnetic transition in the band subsystem. 相似文献
30.
E. A. Sherstobitova K. A. Kozlov A. E. Teplykh Yu. A. Dorofeev Yu. N. Skryabin A. N. Pirogov 《Crystallography Reports》2007,52(3):424-427
The electric resistivity and neutron diffraction measurements of the intermetallic compounds Nd1?x TbxCo2 (x = 0, 0.2, 0.3, 0.5, 0.7, or 1) have been performed. All compounds have a cubic structure at room temperature and a rhombohedral structure at 4.2 K. The magnetic structure of these compounds is described by the wave vector k = 0. The magnetizations of the rare earth and cobalt sublattices increase with increasing x. The concentration dependence of the cobalt sublattice magnetization is explained on the basis of the model of metamagnetic band subsystem in compounds of the RCo2 type. 相似文献