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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Martyanov O., Yudanov V., Lee R., Volkov N. V., Sablina K. A.
Заглавие : A tool to investigate the spatial magnetic phase separation phenomena in manganites
Место публикации : Phys. Stat. Sol (RRL). - 2007. - Vol. 1, Is.1. - P.R22-R24. - DOI 10.1016/j.jmmm.2006.07.033
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Liu Sh., Li L., Qin X., Du R., Sun Y., Xie Sh., Wang J., Molokeev M. S., Xi Sh., Bunzli J.-C. G., Zhou L., Wu M.
Заглавие : Achieving ultra-broadband sunlight-like emission in single-phase phosphors: The interplay of structure and luminescence
Колич.характеристики :9 с
Место публикации : Adv. Mater. - 2024. - Ст.2406164. - Article in press. - ISSN 09359648 (ISSN), DOI 10.1002/adma.202406164. - ISSN 15214095 (eISSN)
Примечания : Cited References: 43. - S.L. and L.L. contributed equally to this work. This work was ﬁnancially supported by grants from the National Natural Science Foundationof China (NSFC, No. 52272174) and its joint project with Guangdong(Nos. U22A20135, U1801253 and U1301242) Province. J. Wang acknowl-edges Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) projects SML2021SP204, SML2023SP215/218/238. The authorsare grateful to Prof. Peter A. Tanner and Prof. Ka-Leung Wong for the indepth communication and valuable advice on the improvement of the manuscriptOpen access funding provided by Ecole Polytechnique Federale de Lausanne
Аннотация: The quest for artificial light sources mimicking sunlight has been a long-standing endeavor, particularly for applications in anticounterfeiting, agriculture, and color hue detection. Conventional sunlight simulators are often cost-prohibitive and bulky. Therefore, the development of a series of single-phase phosphors Ca9LiMg1-xAl2x/3(PO4)7:0.1Eu2+ (x = 0-0.75) with sunlight-like emission represents a welcome step towards compact and economical light source alternatives. The phosphors are obtained by an original heterovalent substitution method and emit a broad spectrum spanning from violet to deep red. Notably, the phosphor with x = 0.5 exhibits an impressive full width at half-maximum of 330 nm. A synergistic interplay of experimental investigations and theory unveils the mechanism behind sunlight-like emission due to the local structural perturbations introduced by the heterovalent substitution of Al3+ for Mg2+, leading to a varied distribution of Eu2+ within the lattice. Subsequent characterization of a series of organic dyes combining absorption spectroscopy with convolutional neural network analysis convincingly demonstrates the potential of this phosphor in portable photodetection devices. Broad-spectrum light source testing empowers the model to precisely differentiate dye patterns. This points to the phosphor being ideal for mimicking sunlight. Beyond this demonstrated application, the phosphor's utility is envisioned in other relevant domains, including visible light communication and smart agriculture.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Altunin R. R., Moiseenko E. T., Zharkov S. M.
Заглавие : Kinetics of diffusion and phase formation in a solid-state reaction in Al/Au thin films
Колич.характеристики :10 с
Место публикации : J. Alloys Compd. - 2024. - Vol. 1002. - Ст.175500. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2024.175500. - ISSN 18734669 (eISSN)
Примечания : Cited References: 83. - This work was supported by the Russian Science Foundation (grant # 22-13-00313)
Аннотация: The kinetics of diffusion and formation of Al-Au intermetallic compounds in a solid-state reaction between layers of aluminum and gold has been studied by the method of in situ electron diffraction. The phase sequence in the solid-state reaction in Al/Au thin films is found to depend on the atomic ratio of aluminum and gold at the initial state. Specifically, with the atomic ratio being Al:Au=2:1, one observes the formation sequence: Al3Au8→AlAu2→Al2Au, while with the ratio Al:Au=1:4, the sequence is Al3Au8→AlAu4. The observed change in the sequence is explained using the theoretical model of EHF (Effective Heat of Formation). The kinetic parameters of the diffusion of gold through the layer of reaction products in the Al/Au thin films have been determined, including the apparent activation energy of the diffusion Ea=1.17 eV and pre-exponential factor D0=120 cm2/s. Based on the data obtained by in situ electron diffraction, the kinetic parameters of the phase formation have been estimated by the Kissinger-Akahira-Sunose method. In addition, the kinetic parameters of the formation of the Al-Au intermetallic compounds have been determined (apparent activation energy Ea, pre-exponential factor A) in the solid-state reaction in the Al/Au thin films, namely, Ea = 0.77 eV, log(A, s−1) = 9 for Al3Au8; Ea = 1.08 eV, log(A, s−1) = 13 for AlAu2; Ea = 1.13 eV, log(A, s−1) = 13 for Al2Au; and Ea = 1.35 eV, log(A, s−1) = 16 for the phase AlAu4. The kinetic parameters of the formation of the AlAu4 phase have been estimated for the first time.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Avramov P. V., Sorokin P. B., Fedorov A. S., Fedorov D. G., Maeda Y.
Заглавие : Band gap unification of partially Si-substituted single wall carbon nanotubes
Место публикации : Phys. Rev. B. - 2006. - Vol. 74. - P.245417. - DOI 10.1103/PhysRevA.75.067401
Примечания : Библиогр.: 44
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bayukov O. A., Petrakovskii G. A., Savitskii A. F.
Заглавие : Orbital Ordering in CuGeO3
Место публикации : Physics of the Solid State: Nauka, 1998. - Vol. 40, № 9. - С. 1534-1539. - ISSN 1063-7834
Аннотация: The combined effect of the ligand crystal field and the exchange interaction on the Cu2+ cation in CuGeO3 is examined. It is shown that, if the magnitude of the exchange interaction exceeds the splitting of the energy levels of the dx2-y2 and dxy orbitals, then an alternate filling of the d orbitals along a chain (orbital ordering) is possible. This effect creates an antiferromagnetic interaction between Cu2+ pairs in 90° exchange and a doubling of the lattice period. A Jahn-Teller pseudoeffect causes singletization of the ground state of the antiferromagnetic chain of Cu2+ spins. © 1998 American Institute of Physics.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Berggren K.-F., Sadreev A. F.
Заглавие : Simulation of wave chaos using resonant electric network analogues
Место публикации : AIP Conf. Proc. - 2006. - Vol. 834. - С. 307-317
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Murueva A. V., Dudaev A. E., Shishatskaya E. I., Ghorabe F. D. E., Nemtsev I. V., Lukyanenko A. V., Volova T. G.
Заглавие : Biodegradable polymer casting films for drug delivery and cell culture
Колич.характеристики :20 с
Место публикации : Giant. - 2024. - Vol. 19. - Ст.100314. - ISSN 26665425 (eISSN), DOI 10.1016/j.giant.2024.100314
Примечания : Cited References: 112. - The study was funded by State Assignment of the Ministry of Science and Higher Education of the Russian Federation (project No. FWES-2021–0025)
Аннотация: In this work, for the first time, films were obtained based on biodegradable polyhydroxyalkanoates (PHAs) - a copolymer of 3-hydroxybutyrate-co-3-hydroxyvalerate P(3HB-co-3HV) and a copolymer of 3-hydroxybutyrate-co-4-hydroxybutyrate P(3HB-co-4HB), containing drugs of different chemical structure and action - antibiotics (ceftazidime, doripenem), antiseptic (chlorhexidine) and tissue regeneration stimulator (Actovegin) for drug delivery and cell culture. Using SEM, AFM and measuring the contact angles of water wetting, it is shown how PHAs composition and loading of films of P(3HB-co-3HV) and P(3HB-co-4HB) with drugs affect the porosity, roughness indicators and adhesive properties of the surface. The constructed films are a depot form of drug, the release of which in vitro is realized for a long time, without burst releases, corresponds to Korsmeyer-Peppas and Higuchi models with diffusion character. Films loaded with antibiotics have pronounced antibacterial activity and suppress the development of pathogens S. aureus and E. coli, without a pronounced negative effect on the adhesion and proliferation of epidermal cells. In the cultures of human keratinocytes HaCaT it was shown that the presence of actovegin, as well as ceftazidime in the films, exhibits a stimulating effect, increasing their number. The results demonstrate the suitability of the depot-films for cellular technologies and are promising for the reconstruction of tissues complicated by infection.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bashmakova E. E., Kudryavtsev A. N., Tupikin A. E., Kabilov M. R., Sokolov A. Е., Frank L. A.
Заглавие : Bioluminescent aptamer-based microassay for detection of melanoma inhibitory activity protein (MIA)
Колич.характеристики :6 с
Место публикации : Anal. Methods. - 2024. - Vol. 16, Is. 26. - P.4234-4239. - ISSN 17599660 (ISSN), DOI 10.1039/D4AY00706A. - ISSN 17599679 (eISSN)
Примечания : Cited References: 23
Аннотация: Melanoma inhibitory activity protein (MIA) does obviously offer the potential to reveal clinical manifestations of melanoma. Despite a pressing need for effective diagnosis of this highly fatal disease, there are no clinically approved MIA detection ELISA kits available. A recommended MIA threshold has not yet been defined, mostly by reason of variability in immunoglobulins' affinity and stability, the difference in sample preparation and assay conditions. Here we present a pair of high-affinity DNA aptamers developed as an alternative recognition and binding element for MIA detection. Their stability and reproducible synthesis are expected to ensure this analysis under standard conditions. The devised aptamer-based solid-phase microassay of model standard and control human sera involves luciferase NLuc as a highly sensitive reporter. Bioluminescence dependence on MIA concentration ranges in a linear manner from 2.5 to 250 ng mL−1, providing a MIA detection limit of 1.67 ± 0.57 ng mL−1.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Rotter I., Sadreev A. F.
Заглавие : Comment on "Bound-state eigenenergy outside and inside the continuum for unstable multilevel systems”
Место публикации : Phys. Rev. A. - 2007. - Vol. 75. - P.67401-1-67401 -3. - DOI 10.1103/PhysRevA.75.067401
Примечания : Библиогр.: 19
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ermilov A.S., Zobov V. E.
Заглавие : Representation of the Quantum Fourier transform on multilevel BASIC Elements by a sequence of selective Rotation Operators
Место публикации : Optics and Spectroscopy. - Наука, 2007. - Т. 103, № 6. - С. 969-975. - ISSN 0030-4034, DOI 10.1134/S0030400X07120211
ISSN: 0030-400X
Аннотация: To experimentally realize quantum computations on d-level basic elements (qudits) at d 2, it is necessary to develop schemes for the technical realization of elementary logical operators. We have found sequences of selective rotation operators that represent the operators of the quantum Fourier transform (Walsh-Hadamard matrices) for d = 3-10. For the prime numbers 3, 5, and 7, the well-known method of linear algebra is applied, whereas, for the factorable numbers 6, 9, and 10, the representation of virtual spins is used (which we previously applied for d = 4, 8). Selective rotations can be realized, for example, by means of pulses of an RF magnetic field for systems of quadrupole nuclei or laser pulses for atoms and ions in traps.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ignatchenko V. A., Laletin O.N.
Заглавие : Magnetoelastic ground state and waves in ferromagnet – nonmag netic dielectric multilayer structure
Место публикации : Phys. Rev. B. - 2007. - Vol. 76, Is. 10. - P.104419-1-104419-11. - DOI 10.1016/j.jmmm.2006.07.033
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkov N. V., Petrakovskii G. A., Patrin K. G., Sablina K. A., Velikanov D. A., Vasil'ev A. D., Boni P., Clementyev E.
Заглавие : In trinsic magnetic inhomogeneity of Eu substituted La0.7Pb0.3MnO3 single crystal
Место публикации : J. Magn. Magn. Mater. - 2007. - Vol. 309, Is. 1. - P.1-6. - DOI 10.1016/j.jmmm.2006.03.031
Примечания : KRSF-RFBR “Enisey2005” Grant no. 05-02-97708-a. N.V. DAAD foundation for financial support (Grant A/03/06137) during his work at the Physics-Department E21 of the Munich Technical University and also Russian Science Support Foundation.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kolovsky A. R.
Заглавие : Deriving Landauer's formula by using the master equation approach
Место публикации : Europhys. Lett. - 2024. - Vol. 146, Is. 6. - Ст.61001. - ISSN 02955075 (ISSN), DOI 10.1209/0295-5075/ad56c3. - ISSN 12864854 (eISSN)
Аннотация: We revisit the problem of two-terminal transport of non-interacting Fermi particles in a mesoscopic device. First, we generalize the transport problem by taking into consideration relaxation processes in contacts (which are characterized by the contact self-thermalization rate γ) and then solve it by using the master equation approach. In the limit γ→0 the obtained results are shown to reproduce those of the Landauer theory. Thus, the presented analysis proves correspondence between the Landauer and master equation approaches to quantum transport —a problem which has been waiting for a solution for decades.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kolovsky A. R.
Заглавие : Effects of internal and external decoherence on the resonant transport and Anderson localization of fermionic particles in disordered tight-binding chains
Колич.характеристики :7 с
Место публикации : Phys. Rev. B. - 2024. - Vol. 110, Is. 3. - Ст.035410. - ISSN 24699950 (ISSN), DOI 10.1103/PhysRevB.110.035410. - ISSN 24699969 (eISSN)
Примечания : Cited References: 41. - This study was supported by the Ministry of Science and Higher Education of Russian Federation, Grant No. FSRZ-2023-0006
Аннотация: We study the effects of relaxation/decoherence processes on quantum transport of noninteracting Fermi particles across the disordered tight-binding chain, where we distinguish between relaxation processes in the contacts (external decoherence) and those in the chain (internal decoherence). It is shown that external decoherence reduces conductance fluctuations but does not alter the Anderson localization length. This is in strong contrast with the effect of internal decoherence which is found to suppress Anderson localization. We also address quantum transport in chains with particle losses which are of considerable interest for laboratory experiments with cold atoms.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Goldner Ph., Guillot-Noël O., Petit J., Popova M., Bezmaternykh L. N.
Заглавие : Light-induced absorption switching in a Nd3+:GdFe3(BO3)4 single crystal
Место публикации : Phys. Rev. B. - 2007. - Vol. 76. - P.165102. - DOI 10.1103/PhysRevB.76.165102
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16.

Вид документа :
Шифр издания :
Автор(ы) : Sakai, Seiji, Yakushiji, Kay, Mitani, Seiji, Sugai I., Takanashi, Koki, Naramoto, Hiroshi, Avramov P. V., Narumi, Kazumasa, Lavrentiev, Vasily, Maeda, Yoshihito
Заглавие : Magnetic and Magnetotransport Properties in Nanogranular Co/C60-Co Film with High Magnetoresistance
Место публикации : Materials Transactions. - 2007. - Vol. 48. - С. 754-758. - DOI 10.1063/1.2354035
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kalinin Y.E., Sitnikov A.V., Makagonov V.A., Foshin V.A., Volochaev M. N., Pripechenkov I.M., Perova N.N., Ganshina E.A., Rylkov V.V., Granovsky A.B.
Заглавие : Magnetic properties and magnetoresistance of hybrid multilayer nanostructures {[(Co40Fe40B20)34(SiO2)66]/[ZnO]}n
Колич.характеристики :9 с
Место публикации : J. Magn. Magn. Mater. - 2024. - Vol. 604. - Ст.172287. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2024.172287. - ISSN 18734766 (eISSN)
Примечания : Cited References: 36. - The work was carried out with the support of the Ministry of Science and Higher Education of the Russian Federation within the framework of a state assignment (project No. FZGM-2023-0006)
Аннотация: The structural, electrical, magnetic, magneto-optical properties and magnetoresistance of {[(Co40Fe40B20)34(SiO2)66]/[ZnO]}n multilayer structures, where n = 50 is the number of bilayers (Co40Fe40B20)34(SiO2)66 nanocomposite and ZnO have been studied. The thicknesses of (Co40Fe40B20)34(SiO2)66 nanocomposite layers as well as ZnO spacers were varied in a wide range. The samples were synthesized by ion-beam sputtering onto glass ceramic substrates. The (Co40Fe40B20)34(SiO2)66 composite have an amorphous structure and the semiconductor ZnO interlayers have a hexagonal crystalline structure with the p63mc symmetry group. The nanocomposite layers containing a ferromagnetic component far from the percolation threshold are in a superparamagnetic state. The presented in the paper data of magnetization, magneto-optical transverse Kerr effect and magnetoresistance indicates that long-range ferromagnetic order does not form down to 77 K both for references ZnO films and studied multilayers with thin and thick ZnO interlayers. An increase in the magneto-optical signal in multilayers compared to references (Co40Fe40B20)34(SiO2)66 composite films has been detected at 1.2 eV. The magnetoresistance of {[(Co40Fe40B20)34(SiO2)66]/[ZnO]}n multilayers with thick (32 nm) ZnO interlayers is lower than in reference (Co40Fe40B20)34(SiO2)66 nanocomposite, while at thin ZnO interlayers magnetoresistance is significantly higher and reaches 12 % at temperatures of 77 К. Possible mechanisms of ferromagnetic and antiferromagnetic ordering, enhancement of the magneto-optical response and magnetoresistance in {[(Co40Fe40B20)34(SiO2)66]/[ZnO]}n multilayer nanostructures are discussed.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkov D.V., Popova E.A., Kolmakova N.P., Demidov A.A., Tristan N., Skourski Yu., Buechner B., Gudim I. A., Bezmaternykh L. N.
Заглавие : Magnetic properties of TbFe3(BO3)4
Место публикации : J. MAGN. MAGN. MATER. - 2007. - Vol. 316, 2 SPEC. ISS. - P.e717-e720. - DOI :10.1016/j.jmmm.2007.03.070
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yasuda Y., Bezmaternikh L., Nakamura H., Fujii Y., Kikuchi H., Chiba M., Yamamoto Y., Hori H., Petrakovskii G., Popov M.
Заглавие : Magnetic successive phase transitions of CuB2 O4 probed by 11B-NMR technique : научное издание
Место публикации : Journal of Magnetism and Magnetic Materials: Elsevier Science Publishing Company, Inc., 2007. - Т. 310, №2 SUPPL. PART 2. - С. 1392-1393. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2006.10.732
Примечания : This research is partly supported by Grant-in-Aid for Scientific Research (C) (No. 1854343) from Japan Society for the Promotion of Science, and by Grant-in-Aid for Young Scientists (B) (No. 17740221) from MEXT, Japan.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Martynov S. N.
Заглавие : Anisotropic exchange interactions in a ferromagnet PbMnBO4
Колич.характеристики :6 с
Место публикации : JETP Lett. - 2024. - Vol. 119, Is. 11. - P.879-884. - ISSN 00213640 (ISSN), DOI 10.1134/S0021364024600812. - ISSN 10906487 (eISSN)
Примечания : Cited References: 43. - I am grateful to A.I. Pankrats, V.I. Zinenko, and S.N. Krylova for useful discussions
Аннотация: The field dependence of the magnetization along the hard axes in a four-sublattice ferromagnet PbMnBO4 is calculated by the numerical minimization of the ground state energy in the approximation of classical magnetic moments. The parameters of anisotropic interactions—the second-order single-ion anisotropy constants, the magnitude and direction of the antisymmetric exchange vector, and the symmetric anisotropic exchange tensor—are obtained by a comparison with experimental magnetization curves. The direction of the Dzyaloshinskii–Moriya interaction vector is close to the orthorhombic c axis. The symmetric exchange tensor has an almost uniaxial form with the easy axis perpendicular to the antisymmetric exchange vector. Changes in the energy of each anisotropic interaction during magnetization reorientation are calculated.
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