Online Library. Theme: Physical and mathematical sciences (p.9)
Found: 181
Found: 181
| Title: | Symmetric guided electromagnetic waves in a shielded slab filled with anisotropic dielectric |
| Author: | Валовик Дмитрий Викторович |
| Type: | Article |
| Kind: | Electronic edition |
| Publication date: | 2020 |
| Publishing house: | Institute of Electrical and Electronics Engineers |
| Title: | Synthesis of Reliable Circuits in the Basis Consisting of the Webb Function in P |
| Author: | Барсукова Оксана Юрьевна |
| Type: | Article |
| Kind: | Electronic copy |
| Publication date: | 2019 |
| Publishing house: | Известия высших учебных заведений. Математика |
| Title: | System of Singular Integral Equations in the Problem on Electromagnetic Oscillations of a Graphene-Coated Dielectric Ball |
| Author: | Кондырев Олег Владимирович |
| Type: | Article |
| Kind: | Electronic copy |
| Publication date: | 2025 |
| Publishing house: | Pleiades Publishing |
| Title: | Temperature dependence of recombination radiation in semiconductor nanostructures with quantum dots containing impurity complexes |
| Author: | Vladimir Dmitrievich Mikhail Borisovich Разумов Алексей Викторович Шорохов Алексей Владимирович |
| Type: | Article |
| Kind: | Electronic copy |
| Annotation: | Temperature dependence of the spectral intensity of recombination radiation in a quasi-zero-dimensional structure, containing impurity complexes "A(+) +e" (a hole localized on a neutral acceptor, interacting with an electron localized in the ground state of a quantum dot), has been investigated in an external electric field in the presence of tunneling decay of a quasistationary A(+)-state. Probability of dissipative tunneling of a hole has been calculated in the one-instanton approximation, and the influence of tunneling decay and of an external electric field on the A(+)-state binding energy and on the spectra of recombination radiation, associated with the optical transition of an electron from the ground state of a quantum dot to the A(+)-state of the impurity center, has been investigated in the adiabatic approximation. "Dips" in the temperature dependence of the SIRR have been revealed, which are associated with the presence of resonant tunneling at certain values of temperature and strength of the external electric field, for which the double-well oscillatory potential becomes symmetric. |
| Publication date: | 2021 |
| Publishing house: | Университет ИТМО |
| Title: | Tensor permittivity reconstruction of two-sectional diaphragm in a rectangular waveguide |
| Author: | Шестопалов Юрий Викторович Деревянчук Екатерина Дмитриевна |
| Type: | Article |
| Kind: | Electronic copy |
| Publication date: | 2015 |
| Publishing house: | Institute of Electrical and Electronics Engineers Inc |
| Title: | The analysis method of primary data for monitoring social processes using Big Data and fuzzy criteria |
| Author: | Bozhday Alexander Бершадский Александр Моисеевич Тимонин Алексей Юрьевич |
| Type: | Article |
| Kind: | Electronic copy |
| Annotation: | The presented work deals with mathematical models' development for determining the significance degree of the social information. It contained in unstructured raw data from public web-sources. The significance criteria of social environment descriptions based on fuzzy logic and probability theory methods. Also, the set theory apparatus used to represent the extracted social objects. Results implementation allows to improve the data relevance and reliability determining in the social profiling system based on Big Data. |
| Publication date: | 2020 |
| Publishing house: | CEUR-WS |
| Title: | The Contact Metric Connection with Skew Torsion |
| Author: | Паньженский Владимир Иванович Климова Татьяна Романовна |
| Type: | Article |
| Kind: | Electronic edition |
| Annotation: | We prove that, on a generalized (multidimensional) Heisenberg group endowed with a left-invariant Sasakian structure, there exists a unique contact metric connection with skew torsion, invariant with respect to the group of automorphisms. The explicit expression of this connection in terms of the contact form and the metric tensor is obtained. It is shown that the torsion tensor and the curvature tensor are covariantly constant, and the sectional curvature varies between -1 and 0. It is proved that the obtained connection is a contact metric connection for any k-contact metric structure, therefore it is a contact metric connection for any Sasakian structure. |
| Publication date: | 2019 |
| Publishing house: | Pleiades Publishing |
| Title: | The Formation of Au Nanoparticles in SiO2–TiO2 Films by Local Electrochemical Reduction Using an Atomic Force Microscope Probe |
| Author: | Vladimir Dmitrievich Mikhail Borisovich |
| Type: | Article |
| Kind: | Electronic copy |
| Annotation: | The aim of this work is to experimentally investigate the features of the formation of Au nanoparticles (NPs) in SiO2–TiO2 films by the method of local electrochemical reduction using an atomic force microscope (AFM) probe. The study has the additional aim of establishing the modes of the formation of Au NPs, which provide controlled production of NPs with specified parameters. The created scientific and technical products are intended for use in nanoelectronics, integrated optics, optoelectronics, and plasmonics to create new nanoelectronic devices based on MNP arrays embedded in dielectric films, metal nanoantennas of arbitrary shape embedded in optical dielectric waveguides based on thin-film structures, etc. (The relevance of ongoing research is related to this.) An experimental study of the formation processes of individual Au NPs in the thickness of SiO2–TiO2 films has been carried out by the method of local electrochemical reduction of Au(III) ions using an AFM probe. Au NPs have been formed in SiO2–TiO2 films using a SolverPro atomic force microscope manufactured by Nanotechnology-MDT (Zelenograd, Russia) in the contact mode. We have used AFM cantilevers made of Si with Pt coating by Nanotechnology-MDT CSG-01. Before the formation of Au NPs, AFM images of a selected area of the gel-film surface have been measured: z(x, y), where x and y are the coordinates of the AFM probe tip in the sample surface plane and z is the surface height at the point with coordinates x, y. In addition, simultaneously with AFM images, images of current for selected areas of the sample surface have been measured. The processes of the Au NPs formation in SiO2–TiO2 gel films containing Au(III) ions deposited on glass substrates with an ITO sublayer by the sol–gel method, have been studied in the course of local electrochemical reduction of Au(III) ions using a conducting AFM probe. It is shown that, after the modification of gel films by applying positive voltage pulses to the AFM probe relative to the ITO sublayer, the images of current for the modified regions show channels of current associated with the formation of Au NPs at the interface between the ITO sublayer and of the gel film as a result of local electrochemical reduction of Au(III) in the area under the contact of the AFM probe to the surface of the gel film. It has been established that the formation of Au NPs also manifests itself in the appearance of hysteresis in the cyclic CVC of the contact between the AFM probe and the surface of the gel film measured during the formation of NPs. It was found that, upon modification of the SiO2–TiO2 gel film by applying a negative voltage pulse to the AFM probe relative to the ITO sublayer, the formation of toroidal Au nanostructures has been observed, associated with the electrochemical reduction of Au(III) ions near the contact of the AFM probe with the surface of the gel film. The results of the carried out studies are planned to be used in the future in the development of methods for the controlled formation of MNPs in thin dielectric films using AFM. |
| Publication date: | 2023 |
| Publishing house: | Springer |
| Title: | The Hydrocuff Sensor Position Analysis for Assessing Therespiration Effect in Measuring Hemodynamics and Blood Pressure |
| Author: | Gerashchenko Sergey Маркулева Марина Владимировна Геращенко Михаил Сергеевич |
| Type: | Article |
| Kind: | Electronic edition |
| Publication date: | 2020 |
| Publishing house: | Institute of Electrical and Electronics Engineers |
| Title: | The Influence of the McCumber Parameter on Parametric Amplification of High-Frequency Radiation by Josephson Junctions |
| Author: | Vladimir Dmitrievich Mikhail Borisovich |
| Type: | Article |
| Kind: | Electronic copy |
| Publication date: | 2018 |
| Publishing house: | Allerton Press, Inc. |
| Title: | The Nonlinear Eigenvalue Problem of ElectromagneticWave Propagation in a Dielectric Layer Covered with Graphene |
| Author: | Тихов Станислав Вячеславович |
| Type: | Article |
| Kind: | Electronic copy |
| Publication date: | 2023 |
| Publishing house: | MDPI |
| Title: | The spectral properties of some nonlinear Sturm-Liouville operators |
| Author: | Валовик Дмитрий Викторович |
| Type: | Article |
| Kind: | Electronic copy |
| Publication date: | 2017 |
| Publishing house: | Institute of Physics and IOP Publishing Limited, UK |
| Title: | The Stability Criterion of a Semiconductor Superlattice in the Drift–Diffusion Approximation |
| Author: | Vladimir Dmitrievich Mikhail Borisovich |
| Type: | Article |
| Kind: | Electronic copy |
| Publication date: | 2018 |
| Publishing house: | Pleiades Publishing, Ltd. (Плеадес Паблишинг, Лтд) (Род-Таун) |
| Title: | The two-step method for determining a piecewise-continuous refractive index of a 2D scatterer by near field measurements |
| Author: | Медведик Михаил Юрьевич Цупак Алексей Александрович |
| Type: | Article |
| Kind: | Electronic copy |
| Publication date: | 2019 |
| Publishing house: | Taylor & Francis, UK |
| Title: | Theory of Nonlinear Guided Electromagnetic Waves in a Plane Two-Layered Dielectric Waveguide |
| Author: | Валовик Дмитрий Викторович Мартынова Валерия Юрьевна Мартынова Валерия Юрьевна |
| Type: | Article |
| Kind: | Electronic copy |
| Publication date: | 2017 |
| Publishing house: | Elsevier Science Publishing Company, Inc. |
| Title: | Theory of nonlinear transverse-magnetic guided waves in a plane waveguide filled with nonhomogeneous nonlinear medium |
| Author: | Валовик Дмитрий Викторович Тихов Станислав Вячеславович |
| Type: | Article |
| Kind: | Electronic edition |
| Publication date: | 2022 |
| Publishing house: | Taylor and Francis Ltd. |
| Title: | Two-step method for solving inverse problem of diffraction by an inhomogenous body |
| Author: | Цупак Алексей Александрович Медведик Михаил Юрьевич |
| Type: | Article |
| Kind: | Electronic copy |
| Publication date: | 2018 |
| Publishing house: | Springer International Publishing, Switzerland |
| Title: | Volterra black-box models identification methods: direct collocation vs. least squares. |
| Author: | Тында Александр Николаевич |
| Type: | Article |
| Kind: | Electronic copy |
| Publication date: | 2024 |
| Publishing house: | Multidisciplinary Digital Publishing Institute (MDPI) |
| Title: | Volterra Models in Load Leveling Problem |
| Author: | Тында Александр Николаевич Тында Александр Николаевич |
| Type: | Article |
| Kind: | Electronic copy |
| Annotation: | Further growth in renewable energy and planned electrification and decentralization of transport and heating loads in future power systems will result in a more complex unit commitment problem (UCP). This paper proposes an adaptive approach to load leveling problem using novel dynamic models based on the Volterra integral equations of the first kind with piecewise continuous kernels. This approach employs a direct numerical method. The considered collocation-type numerical method has the second-order accuracy and enjoys self-regularization properties, which is associated with confidence levels of system demand. This adaptive approach is suitable for energy storage optimization in real time. The efficiency of the proposed methodology is demonstrated on the Single Electricity Market of the Island of Ireland. |
| Publication date: | 2018 |
| Publishing house: | EDP Sciences |
| Title: | Y -Mapping Method for Nonlinear Eigenvalue Problems |
| Author: | |
| Type: | Article |
| Kind: | Electronic copy |
| Annotation: | Amethod of Y -maps is proposed that allows us to investigate nonlinear multiparameter eigenvalue problems and prove the existence of solutions. The definition of Y -mapping is introduced. Nonlinear eigenvalue problem reduced to the problem of finding fixed points of Y -maps. Using the Y -mapping method, we prove the existence of an infinite set of solutions in a nonlinear multiparameter eigenvalue problem for sufficiently small values of the nonlinearity coefficient. Application to the problem of propagation of coupled polarized electromagnetic waves in a nonlinear layer with saturated nonlinearity is presented. |
| Publication date: | 2022 |
| Publishing house: | Pleiades Publishing, Ltd. (Плеадес Паблишинг, Лтд) |