Журнал нано- та електронної фізики (Journal of nano- and electronic physics)
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Item Простая методика измерения коротких газовых импульсов(Изд-во СумГУ, 2004) Батурін, Володимир Андрійович; Батурин, Владимир Андреевич; Baturin, Volodymyr Andriiovych; Карпенко, А.Ю.; Колинько, С.В.Item Тепловой баланс помещения с электрической кабельной системой отопления(Изд-во СумГУ, 2004) Черных, Л.Ф.Item Електропровідність полімерних композиційних матеріалів,сформованих в обертовому магнітному полі(Вид-во СумДУ, 2004) Кирик, Г.В.; Стадник, О.Д.Mechanisms electro conductivity polymeric composite materials generated in a rotating magnetic field are considered. Composite materials received by crystallization of a polymeric matrix from melt at the presence of a magnetic field. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/10909Item Гипотетическая структура детонационного фронта(Изд-во СумГУ, 2004) Батурін, Володимир Андрійович; Батурин, Владимир Андреевич; Baturin, Volodymyr Andriiovych; Шимко, А.И.In work the hypothesis about existence in front of a detonation wave of a transitive layer in which explosive exists in a gaseous kind with a periodic arrangement of atoms is stated. As a result of interaction with hypersound and electromagnetic wave packages gas is ionized, and plasma gets super conducting properties. In relaxation zone fast reactions of the activated complex and slow chemical reactions of products of a detonation proceed. The structure of front of a detonation wave is formulated. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/10906Item Некоторые закономерности формирования комбинированных покрытий на основе C/Al/Al2O3 до и после обработки пучками частиц(Изд-во СумГУ, 2004) Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Бойко, А.Г.; Гриценко, Б.П.; Погребняк, Н.А.; Калышканов, М.К.; Рузимов, Ш.М.Item Experimental results regarding the influence of initial ovality on local buckling under external pressure (collapse) of oil industry tubulars(Видавництво СумДУ, 2003) Dumitrescu, A.; Zisopol, D.G.An important load which can considerably affect the resistance capacity of oil industry tubulars (mainly casing and tubing in high pressure wells, and submarine pipelines installed in deep waters) is the external pressure, causing the pipe collapse phenomenon. Some of the factors with the greatest influence on pipe collapse behaviour are its geometrical imperfections (ovality, eccentricity, etc.). This paper presents the results of research activities aimed to investigate the influence of the pipe initial ovality on the external pressure collapse phenomenon, in order to define design methodologies and criteria for assessing the external pressure resistance capacity of oil industry tubulars. To that purpose, some tests have been performed on small scale pipe specimens, based on the similitude law, and their results have been compared with the calculation formulas usually used to assess pipe collapse resistance capacity considering the influence of initial ovality. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/10900Item Структура и свойства защитных гибридных покрытий, нанесенных комбинированным способом (обзор)(Изд-во СумГУ, 2004) Погребняк, Олександр Дмитрович; Погребняк, Александр Дмитриевич; Pohrebniak, Oleksandr Dmytrovych; Кравченко, Юлія Анатоліївна; Кравченко, Юлия Анатольевна; Kravchenko, Yuliia AnatoliivnaItem Three-phased inverter analysis in linear modulated regime with weak inductive charge in triangle connection(Видавництво СумДУ, 2003) Cremenescu, Gh.The paper presents a framework for the analysis of the three-phased inverter functioning in linear modulated regime with weak inductive charge in triangle connection. The resistive – inductive charge with a power factor cosφ > 0,55 is defined as weak inductive. The recovery time of the reactive energy accumulated in the charge’s inductances is smaller than tact (an interval from a period). On the circuits configurated in the pulses of a tact one determines their equations in transitory regime and their solutions, and on the basis of some recurrent relations for the other tacts one determines the waveforms of the voltages and electric currents for a period. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/10895Item Simulation model of the mono-phased inverter with pulses width modulation(Видавництво СумДУ, 2003) Cremenescu, Gh.The article presents a model of pulse width modulation based on the assessment of a certain harmonic content of the inverter synthetic voltage. The commutation moments of the pulses (with the same amplitude but with different widths) are computed in the conditions when the fundamental of the synthetic voltage is equal to the proposed sinusoidal voltage, and the high harmonics up to order 4m – 2 are null. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/10890Item Анализ частотных характеристик двухкаскадного магнетронного автогенератора(Изд-во СумГУ, 2004) Чурюмов, Г.И.; Фролова, Т.И.; Грицунов, А.В.; Исаева, Е.Б.In this paper the frequency pushing in classical magnetrons and a two-stage magnetron oscillator by a particle-in-cell (PIC) method is discussed. The physics of the frequency shift vs. an anode voltage is shown as well as quantitative comparison of the frequency pushing in different designs of the magnetrons vs. operating modes (changing anode voltage and value of magnetic field). When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/10878