<B>Д 64.051.02 (Фізико-математичні науки) </B>
Постійне посилання колекціїhttps://ekhnuir.karazin.ua/handle/123456789/10738
01.03.02 - астрофізика, радіоастрономія;
01.04.01 - фізика приладів, елементів і систем;
01.04.03 - радіофізика
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12 результатів
Результати пошуку
Документ Формування електромагнітних полів комбінованими вібраторно-щілинними випромінюючими структурами в електродинамічних об’ємах з імпедансними границями(Харків : Харківський національний університет імені В.Н. Каразіна, 2021) Бердник, Сергій Леонідович; Berdnik, S.L.Berdnik S.L. Formation of electromagnetic fields by combined vibrator-slot radiating structures in electrodynamic volumes with impedance boundaries. – Manuscript of qualifying scientific work. Thesis for a Doctor degree in physical and mathematical sciences: Speciality 01.04.03 – radiophysics (Physical and mathematical sciences). – V.N. Karazin Kharkiv National University, Ministry of Education and Science of Ukraine, Kharkiv, 2021. The dissertation is devoted to the development of the theory of combined vibrator-slot radiating structures, creation of physically correct mathematical models, and improvement of numerical-analytical methods for solving corresponding boundary value problems of electrodynamics, which allow a theoretical analysis of physical properties of excitation fields (the radiation, scattering) and functional characteristics of combined vibrator-slot structures containing impedance vibrators and slot radiators, as well as their multi-element systems located in different electrodynamic volumes with impedance boundaries (including coating of metamaterial) and filled with material.Документ Дія високоенергетичних джерел на атмосферно-космічні радіоканали(Харків : Харківський національний університет імені В.Н. Каразіна, 2021-05-25) Розуменко, Віктор Тимофійович; Rozumenko, V.T.Rozumenko V. T. Action of High-Energy Sources on Atmospheric and Space Radio Channels. – Manuscript. Thesis for a Doctor of Science Degree in Physics and Mathematics Science, Specialty 01.04.03 – Radio Physics. — V. N. Karazin Kharkiv National University of the Ministry of Education and Science of Ukraine. — Kharkiv, 2021. The dissertation is concerned with solving a topical problem, the experimental and theoretical study of the impact of high-energy sources of natural and artificial origins on the characteristics of radio waves and on atmospheric and space radio channels that are used in radar, radio navigation, telecommunications, direction-finding radio system, etc. The goal of the dissertation is to study the main physical processes in the atmosphere and geospace that accompanied the impact of the Chelyabinsk and Kamchatka meteoroids on the environment, the influence of geospace storms, typhoons, earthquakes, launches of large rockets, and of the firing of orbital maneuvering thrusters, as well as the influence of high-power nanosecond radio emissions, which all are important for radio wave propagation and radio channel performance.Документ Міра обертання радіовипромінювання пульсарів у декаметровому діапазоні(Харків : Харківський національний університет імені В.Н. Каразіна, 2021) Шевцова, Аліса Ігорівна; Shevtsova, A.I.Shevtsova A. I. Rotation measure of pulsar radio emission at decameter range. – Manuscript. Thesis for а Candidate Degree in Physics and Mathematics, Speciality 01.03.02 – Astrophysics, radio astronomy. – Institute of Radio Astronomy of National Academy of Sciences of Ukraine; V. N. Karazin Kharkiv National University of the Ministry of Education and Science of Ukraine. – Kharkiv, 2021. The dissertation is devoted to the study of rapid changes in the rotation measure of radio radiation of pulsars closest to the Earth on short time scales in the decameter range. The dissertation proposes an original approach in which the parameters of the propagation medium are dynamically variable in the time scale of one pulse. This approach allows to analize the rapid processes in the upper layers of the magnetosphere of the pulsar and the pulsar wind. It is in these areas that the rotation measure, as a parameter describing the electron concentration and the magnetic field induction parallel to the line of sight, can vary depending on the phase of the individual pulse. The parameters of the radio propagation medium located further from the pulsar are stable at such time scales and cannot change so quickly.Документ Електромагнітні хвилі у багатокомпонентних штучних композитних матеріалах(Харків : Харківський національний університет імені В.Н. Каразіна, 2021-05-25) Фесенко, Володимир Іванович; Fesenko, V.I.Fesenko V. I. Electromagnetic waves in multicomponent artificial composite media. – Qualification scientific work is as a manuscript. Thesis for a Doctoral Degree in Physics and Mathematics, Specialtiy 01.04.03 – Radiophysics. – Institute of Radio Astronomy of the National Academy of Sciences of Ukraine; V. N. Karazin Kharkіv National University Ministry of Education and Science of Ukraine. – Kharkiv, 2020. The thesis is related to a new field of modern radiophysics, which concerns with the synthesis of artificial composite structures and theoretical and experimental study of their electromagnetic properties. The structures under study are composed of optically active components and can operate on the same physical principles in different frequency ranges from microwave to visible. The aim of the work is to develop and analyze, in the framework of a unified theory, several physical and mathematical models of the electromagnetic field interaction with artificial composite media. In the proposed models, the effects of anisotropy and spatial inhomogeneity on the characteristics of electromagnetic wave propagation in the studied artificial structures are accounted for. The author develops and generalizes the existing methods of analysis of artificial structures with complex spatial composition. These methods combined with other approaches of modern radiophysics and mathematical physics allow revealing a number of new physical conditions and effects of propagation and scattering of electromagnetic waves in such composite structures.Документ Коливна динаміка домішкових нанокомплексів при формуванні терагерцових смуг нелінійно-оптичного підсилення у кварцових волокнах(Харків : Харківський національний університет імені В.Н. Каразіна, 2020) Сердега, Ірина Володимирівна; Serdeha, I.V.Serdeha I. V. Oscillatory dynamics of doping nanocomplexes at the terahertz bands formation of nonlinear optical amplification in silica fibers. - Qualifying scientific work on the manuscript rights. The dissertation on competition of a scientific degree of the candidate of physical and mathematical sciences on a specialty 01.04.03 – Radiophysics, V. N. Karazin Kharkiv National University, Kharkiv, 2020. The dissertation is devoted to experimental research of nonlinear optical amplification of light in singlemode fibers based on the silica glass and it contained the numerical modeling of oscillatory dynamics of doping nanocomplexes, which forms the Raman gain profiles of light in the different types of singlemode fibers based on the sislica glass. Actuality currently due to increased interest in analyzing physical characteristics of individual and collective influence of phonon vibrations in the fiber core that really determine the gain effectiveness of optical signals using stimulated Raman effect. The available experimental data of measurement of amplified spontaneous emission (ASE) using to the counter-pumping scheme in the silica singlemode fiber at the region of 1420 nm…1650 nm are analyzed; the peculiarities of the oscillatory dynamics of impurity nanocomplexes on the formation of optical amplification due to stimulated Raman effect by multimode decomposition in several types of silica fibers have been studied. The method of separation onto stimulated and spontaneous parts in the measured ASE spectra was improved. The Gaussian filtering technique of the measuring equipment noises at ASE registration in the idling mode of the nonlinear optical amplifier is developed. For the first time the quantitative determination technique of values of individual pumping LD wavelength shifts as function of its radiation intensity is offered in this work.Документ Підвищення метрологічних та експлуатаційних характеристик елементів та систем атомно-емісійного спектрального аналізу(Харків : Харківський національний університет імені В.Н. Каразіна, 2020) Єгоров, Вадим Анатолійович; Yegorov, V.A.Yegorov V. A. Improving metrological and operational characteristics of elements and systems of atomic emission spectral analysis. – Manuscript. Thesis for Candidate Degree in Physical and Мathematical Sciences, Speciality 01.04.01 – Physics of Devices, Elements and Systems. – O. Ya. Usikov Institute for Radiophysics and Electronics, National Academy of Sciences of Ukraine; V. N. Karazin Kharkiv National University, Ministry of Education and Science of Ukraine, Kharkiv, 2020. The dissertation is devoted to solving the problem of identifying the physical laws of the processes of excitation, analysis and registration of the spectra of arc and spark plasma formations in the equipment for atomic emission spectral analysis, and the use of these laws to improve the metrological and operational characteristics of analytical equipment. The development and creation of a complex of equipment for atomic emission spectral analysis, research and implementation of methods for improving their metrological and operational characteristics have been completed.Документ Випромінювання і розповсюдження нестаціонарних електромагнітних полів у нелінійних, нестаціонарних та біологічних середовищах(Харків: Харківський національний університет імені В.Н. Каразіна, 2021) Думін, Олександр Миколайович; Dumin, О.М.Dumin O. M. Radiation and propagation of nonstationary electromagnetic fields in nonlinear, nonstationary and biological media. – Manuscript. Dissertation for the degree of Doctor of Physical and Mathematical Sciences in specialty 01.04.03 – Radio Physics. V. N. Karazin Kharkiv National University, the Ministry of Education and Science of Ukraine, Kharkiv, 2021. The dissertation is devoted to research of processes of radiation and propagation of transient electromagnetic fields in unbounded nonlinear, nonstationary, layered inhomogeneous, transversely inhomogeneous, and, also, biological media by time domain methods.Документ Поля імпульсних антен у лінійному та нелінійному середовищах(Харків : Харківський національний університет імені В.Н. Каразіна, 2020) Ахмедов, Ролан Джавадович; Akhmedov, R.Akhmedov. R. Field of Impulse Radiating Antennas in Linear and Nonlinear Medium – Manuscript. Dissertation for the degree of a candidate of physical and mathematical sciences in specialty 01.04.03 Radiophysics. V. N. Karazin Kharkiv National University of the Ministry of Education and Science of Ukraine, Kharkiv, 2020. The manuscript is a theoretical investigation of impulse ultrawideband electromagnetic field properties in near and far radiation zones. The whole thesis topic is united by the same approach of radiation and reception problems solving with an attention to near zone еffects. The idea of the approach is to avoid furrier transform and provide a solution in time domain. As the result the solution will not carry near radiation zone as a spatial case of radiation. Most of problems considered in the manuscript have impulse radiating antenna as a source of electromagnetic filed. The attention to near radiation zone is caused by energy concentration with nonlinear interactions and impulse shape distortion.Документ Система імпедансної спектроскопії біологічних рідин і суспензій(Харків: Харківський національний університет імені В.Н. Каразіна, 2021) Антоненко, Євгеній Олександрович; Antonenko, Ye.; Антоненко, Еагений АлександровичAntonenko Ye. The impedance spectroscopy system for biological fluids and suspensions. – Manuscript. The thesis for scientific degree of candidate of physical and mathematical sciences, specialty 01.04.01 - physics of devices, elements and systems. – V.N. Karazin Kharkiv National University, Kharkiv, 2021. The thesis is devoted to the development and approbation of an impedance spectroscopy system for the analysis and measurement of the electrophysical properties of biological materials, liquids and suspensions. Suspensions of metal nanoparticles were investigated by impedance spectroscopy, and the efficiency of the indirect method of measuring the mass fraction of metals in an aqueous suspension was confirmed. The efficiency of the method of impedance spectroscopy for rapid analysis of nativeness and measurement of fat content of biological samples and dairy products is shown.Документ Низькочастотне космічне радіовипромінювання як об’єкт спостереження широкосмуговим радіотелескопом нового покоління(Харків : Харківський національний університет імені В.Н. Каразіна, 2020) Єрін, Сергій Миколайович; Yerin, S. M.Yerin S. M. Low-frequency cosmic radio emission as an object of observations with wideband radio telescope of the new generation. – Manuscript. Thesis for а Candidate Degree in Physics and Mathematics, Speciality 01.03.02 – Astrophysics, radio astronomy. – Institute of Radio Astronomy of National Academy of Sciences of Ukraine; V. N. Karazin Kharkiv National University of the Ministry of Education and Science of Ukraine. – Kharkiv, 2020. The thesis describes studies of continuum, sporadic and pulsed radio emissions of objects of the Universe in decameter and meter wave ranges using a small-sized low-frequency radio telescope of the new generation. As an example of such radio telescope, a 25-element GURT radio telescope subarray was chosen.