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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Smolyakov D. A., Tarasov A. S., Bondarev M. A., Nikolskaya A. A., Vasiliev V. K., Volochaev M. N., Volkov N. V.
Заглавие : Admittance spectroscopy of dopants implanted in silicon and impurity state-induced AC magnetoresistance effect
Место публикации : Mater. Sci. Semicond. Process. - 2021. - Vol. 126. - Ст.105663. - ISSN 13698001 (ISSN), DOI 10.1016/j.mssp.2021.105663
Примечания : Cited References: 21. - This study was supported by the Government of the Russian Federation , Mega Grant for the Creation of Competitive World-Class Laboratories (Agreement no. 075-15-2019-1886)
Аннотация: A silicon structure doped with Ga using ion implantation has been investigated by admittance spectroscopy. It has been established that the presence of the Ga impurity, along with the B one, in the silicon structure leads to the appearance of the second peak in the temperature dependence of the real part of the impedance (admittance). Moreover, switching-on a magnetic field parallel to the sample plane shifts the singularities in the temperature curve to the high-temperature region. This results in the manifestation of both the positive and negative magnetoresistance effect upon temperature and magnetic field variation. It has been found by the standard admittance spectroscopy analysis of the impedance data that the energy structure of the investigated sample includes two interfacial energy levels ES1(0) = 42 meV and ES2(0) = 69.4 meV. As expected, these energies are consistent with the energies of B and Ga dopants. In a magnetic field, these levels increase by 3 meV for B and 2 meV for Ga, which induces the magnetoresistance effect. It has been demonstrated that the interfacial state-induced magnetoresistance effect can be tuned by ion implantation and dopant selection.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zobov V. E., Pichkovskiy I. S.
Заглавие : Associative memory on qutrits by means of quantum annealing
Место публикации : Quantum Inf. Process. - 2020. - Vol. 19, Is. 9. - Ст.342. - ISSN 1570-0755, DOI 10.1007/s11128-020-02851-x. - ISSN 1573-1332(eISSN)
Примечания : Cited References: 23
Аннотация: When associative memory is implemented on the well-studied Hopfield network, patterns are recorded in the interaction constants between binary neurons. These constants are chosen so that each pattern should have its own minimum energy of the system described by the Ising model. In the quantum version of the Hopfield network, it was proposed to recall such states by the adiabatic change of the Hamiltonian in time. Qubits, quantum elements with two states, for example, spins with S=1/2 were considered as neurons. In this paper, for the first time, we study the function of associative memory using three-level quantum elements-qutrits, represented by spins with S=1. We record patterns with the help of projection operators. This choice is due to the need to operate with a state with a zero spin projection, whose interaction with the magnetic field vanishes. We recall the state corresponding to one of the patterns recorded in the memory, or superposition of such states by means of quantum annealing. To equalize the probabilities of finding the system in different states of superposition, an auxiliary Hamiltonian is proposed, which is turned off at the end of evolution. Simulations were performed on two and three qutrits and an increase in the memory capacity after replacing qubits with qutrits was shown.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Gokhfeld D. M.
Заглавие : Asymmetric hysteresis loops, critical current and scale
Коллективы : International workshop on processing and applications of superconducting (RE)BCO large grain materials
Место публикации : 9th International Workshop on Processing and Applications of Superconducting (RE)BCO Large Grain Materials (PASREG 2015): book of abstacts. - 2015. - С. 65
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Korshunov M. A., Shabanov V. F.
Заглавие : Boson peak in low-frequency Raman spectra of polymethylmethacrylate
Место публикации : Optoelectron. Instrum. Data Proces.: Allerton Press, 2016. - Vol. 52, Is. 6. - P.580-584. - ISSN 87566990 (ISSN), DOI 10.3103/S875669901606008X
Примечания : Cited References: 23
Ключевые слова (''Своб.индексиров.''): boson peak--raman spectra--anharmonicity--modeling
Аннотация: The role of the local field, anharmonicity, and degree of disorder in the formation of the boson peak has been studied. The low-frequency Raman spectrum of a model polymethylmethacrylate crystal with disorder elements was calculated using the method of atom-atom potentials taking into account the effect of local fields on the spectrum. The calculations were carried out for a crystal containing rigid molecules of an isotactic polymethylmethacrylate oligomer and for a structure with flexible molecules. © 2016, Allerton Press, Inc.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Svetlichnyi V. A., Shabalina A. V., Lapin I. N., Goncharova D. A., Velikanov D. A., Sokolov A. Е.
Заглавие : Characterization and magnetic properties study for magnetite nanoparticles obtained by pulsed laser ablation in water
Место публикации : Appl. Phys. A. - 2017. - Vol. 123, Is. 12. - Ст.763. - ISSN 09478396 (ISSN), DOI 10.1007/s00339-017-1390-7
Примечания : Cited References: 40. - This work was conducted as a government task of the Ministry of Education and Science of the Russian Federation, Project Number 3.9604.2017/8.9.
Ключевые слова (''Своб.индексиров.''): magnetite--pulsed laser ablation--nanoparticles--dispersion
Аннотация: Magnetite (Fe3O4) nanoparticles of 1–10 nm (with the maximum at 2 nm) were obtained via pulsed laser ablation of iron target in water in form of a stable dispersion without addition of surfactants and stabilizers. The structure of the material obtained was investigated using transmission electron microscopy, scanning electron microscopy, and Brunauer–Emmett–Teller methods. To investigate the composition of the particles in the sample, such methods as Fourier transform infrared spectroscopy, Raman spectroscopy, differential scanning calorimetry, and X-ray diffraction, were applied. Magnetite phase was found to be sufficiently pure, it was not contaminated by other iron oxide phases and contained not more than 0.5% of metallic iron in form of large particles. The study of the magnetic properties of the magnetite nanoparticles obtained has shown that they exhibit ferrimagnetic behavior at room temperature with the paramagnetic contribution explained by the presence of fine superparamagnetic particles.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zobov V. E., Pichkovskiy I. S.
Заглавие : Clustering by quantum annealing on the three-level quantum elements qutrits
Место публикации : Quantum Inf. Process. - 2022. - Vol. 21, Is. 4. - Ст.144. - ISSN 15700755 (ISSN), DOI 10.1007/s11128-022-03482-0
Примечания : Cited References: 28. - This study was supported by the Theoretical Physics and Mathematics Advancement Foundation “BASIS” #20-1-5-41-1. We are grateful for their trust and assistance in research
Аннотация: Clustering is grouping of data by the proximity of some properties. We report on the possibility of increasing the efficiency of clustering of points in a plane using artificial quantum neural networks after the replacement of the two-level neurons called qubits represented by the spins S = 1/2 by the three-level neurons called qutrits represented by the spins S = 1. The problem has been solved by the slow adiabatic change of the Hamiltonian in time. The methods for controlling a qutrit system using projection operators have been developed and the numerical simulation has been performed. The Hamiltonians for two well-known clustering methods, one-hot encoding and k-means, have been built. The first method has been used to partition a set of six points into three or two clusters and the second method, to partition a set of nine points into three clusters and seven points into four clusters. The simulation has shown that the clustering problem can be effectively solved on qutrits represented by the spins S = 1. The advantages of clustering on qutrits over that on qubits have been demonstrated. In particular, the number of qutrits required to represent N data points is smaller than the number of qubits by a factor of log 2N/ log 3N. For qutrits, the simplest is to partition the data points into three clusters rather than two ones. At the data partition into more than three clusters, it has been proposed to number the clusters by the numbers of states of the corresponding multi-spin subsystems, instead of using the numbers of individual spins. This reduces even more the number of qutrits (Nlog 3K instead of NK) required to implement the algorithm.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Flerov I. N., Gorev M. V., Bogdanov E. V.
Заглавие : Complex fluorides and oxyfluorides: successive ferroelastic phase transitions and barocaloric effect
Коллективы : International Symposium on Solid State Chemistry for Applications and Sustainable Development, Sustainable Industrial Processing Summit and Exhibition, FLOGEN Stars Outreach
Место публикации : Tressaud Int. Symp. on Solid State Chem. for Applications and Sustainable Dev.: program. - 2019. - Ст.ChemistryFriPM106. - P.103
Примечания : Cited References: 4
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sukhanova, Anna, Boyandin, Anatoly, Ertiletskaya, Natalya, Shalygina, Taisia, Shabanov A. V., Vasiliev, Alexander, Obvertkin, Ivan, Brott, Valeria, Prokopchuk, Yulia, Samoilo, Alexander
Заглавие : Composite polymer granules based on poly-ε-caprolactone and montmorillonite prepared by solution-casting and melt extrusion
Колич.характеристики :20 с
Место публикации : Polymers. - 2023. - Vol. 15, Is. 20. - Ст.4099. - ISSN 20734360 (eISSN), DOI 10.3390/polym15204099
Примечания : Cited References: 45. - This research was supported by a grant from the Russian Science Foundation, project No. 23-16-00184
Аннотация: Eco-friendly polymer composites in the form of granules based on biodegradable polycaprolactone (PCL) with the inclusion of montmorillonite (MMT) from 5 to 50 wt% were prepared by solution-casting and melt extrusion. The physicochemical properties of the composite granules were studied using FTIR spectroscopy, XRDA, DSC, and TGA methods. The paper presents comparative values of crystallinity of composite granules which depend on the method of measuring (XRDA, DSC). It was shown that the crystallinity of PCL/MMT granules was affected by the preparation method and by the MMT content, and that with increase in MMT content, crystallinity increased by up to 61–67%. The change in crystallinity of the granules also affected its biodegradation in soil. At the end of exposure in soil, the mass loss for the granules prepared by solution-casting was more than 90%, whereas for the composite granules prepared by extrusion it was less than 60%. Applying melt extrusion enabled obtaining intercalated composites with predictable features, whereas only mixed-structure microcomposites could be prepared by solution-casting.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volova T. G., Golubev A. I., Nemtsev I. V., Lukyanenko A. V., Dudaev A. E., Shishatskaya E. I.
Заглавие : Correction: Volova et al. Laser processing of polymer films fabricated from PHAs differing in their monomer composition. Polymers 2021, 13, 1553
Колич.характеристики :2 с
Место публикации : Polymers. - 2024. - Vol. 16, Is. 8. - Ст.1075. - ISSN 20734360 (eISSN), DOI 10.3390/polym16081075
Примечания : Cited References: 1
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gokhfeld D. M.
Заглавие : Critical current density and trapped field in HTS with asymmetric magnetization loops
Коллективы : International Workshop on Processing and Applications of Superconducting (RE)BCO Large Grain Materials
Место публикации : J. Phys. Conf. Ser.: IOP Publishing, 2016. - Vol. 695, Is. 1. - Ст.012008. - ISSN 17426588 (ISSN), DOI 10.1088/1742-6596/695/1/012008
Примечания : Cited References: 19
Ключевые слова (''Своб.индексиров.''): critical current density (superconductivity)--critical currents--current density--critical state models--field dependence--grain size--hysteresis curve--magnetization loops--superconducting grains--trapped field--trapped magnetic field--superconducting materials
Аннотация: Applications of the extended critical state model are considered. The trapped magnetic field, the penetration field and the field dependence of the critical current density are analysed. The critical current density and the trapped field in superconducting grains depend on the grain size. Asymmetry of the hysteresis curves relative to the M = 0 axis is related to the scale of the current circulation. © Published under licence by IOP Publishing Ltd.
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