536 research outputs found
Noiseless amplification in cavity-based optical systems with an internal two-photon process. II. Self-frequency-doubling laser and second-harmonic generation, self-down-converting laser
No full textQuantum fluctuations in multimode semiconductor lasers
No full textWe derive a quantum macroscopic model for a multimode semiconductor laser, starting from a complete microscopic description. Nonlinear gain terms describing saturation and mode-mode interaction are obtained by a suitable treatment of the spectral hole burning in the distribution of carriers. In the case in which there are two neighbouring active longitudinal modes above threshold and for quiet pumping, we calculate the spectrum of the total intensity fluctuations at zero frequency. For moderate pumping level the nonlinear gain terms do not reduce the degree of anticorrelation between modes, leaving the squeezing in total intensity unchanged with respect to the single-mode case. Only for very high pumping does the nonlinear gain suppression become relevant, and the total intensity noise is increased
Field data filtering for the digital simulation of three-dimensional turbulent flows using the LES approach
No full textСухинов Александр Иванович – член-корреспондент РАН, доктор физико-математических наук, профессор, заведующий кафедрой математики и информатики, Донской государственный технический университет, e-mail: [email protected].
Проценко Софья Владимировна – кандидат физико-математических наук, доцент кафедры математики, Таганрогский институт имени А.П. Чехова (филиал) Ростовского государственного экономического университета (РИНХ), e-mail: [email protected].
Проценко Елена Анатольевна – кандидат физико-математических наук, доцент кафедры математики, Таганрогский институт имени А.П. Чехова (филиал) Ростовского государственного экономического университета (РИНХ), e-mail: [email protected]. Sukhinov Aleksandr Ivanovich is Corresponding Member of the Russian Academy of Sciences, Doctor of Physical and Mathematical Sciences, Professor, Head of the Mathematics and Computer Sci-ence Department, Don State Technical University, Rostov-on-Don, Russian Federation, e-mail: [email protected], ORCID iD: https://orcid.org/0000-0002-5875-1523
Protsenko Sofya Vladimirovna is Candidate of Physical and Mathematical Sciences, Associate Professor of the Mathematics Department, Chekhov Taganrog Institute (branch) Rostov State University of Economics, Taganrog, Russian Federation, e-mail: [email protected], ORCID iD: https://orcid.org/0000-0001-9656-8466X
Protsenko Elena Anatol'evna is Candidate of Physical and Mathematical Sciences, Associate Professor of the Mathematics Department, Chekhov Taganrog Institute (branch) Rostov State University of Economics, Taganrog, Russian Federation, e-mail: [email protected], ORCID iD: https://orcid.org/0000-0001-7911-3558XТурбулентность и последующее перемешивание являются важными механизмами, определяющими динамику прибрежной зоны, перенос импульса, массы и тепла. В работе мелкомасштабное движение исключается из уравнений Навье-Стокса при помощи применения операции фильтрации и моделируется с использованием подсеточных моделей. Для этого в двумерном и трехмерном случаях применены различные виды фильтров: коробочный фильтр, фильтр Гаусса и фильтр Фурье, с постепенным уменьшением ширины фильтра, что позволяет воспроизвести более широкий частотный диапазон флуктуаций решения. Процедуре фильтрации подвержены натурные данные, полученные в ходе экспедиции в Центрально-Восточной части Азовского моря и в Таганрогском заливе на НИС «Денеб» Южного научного центра РАН. Для измерения трехмерного вектора скорости движения водной среды использовался гидрофизический ADCP-зонд Workhorse Sentinel 600, с помощью которого получено более 3 000 000 исходных измерений, в каждой точке (на каждой станции, которых 17) – более 150 000. Полученные данные планируется использовать для численного моделирования трехмерных турбулентных течений с применением подхода LES и сопоставления с результатами осреднения по RANS. В статье рассмотрены возможности применения различных типов аппроксимаций для параметризации вертикального турбулентного обмена. Проведено сравнение алгебраических моделей расчета коэффициента вертикального турбулентного обмена и полуэмпирических моделей турбулентности. Turbulence and subsequent mixing are important mechanisms which determine the dy-namics of the coastal zone, as well as the transfer of momentum, mass and heat. In this paper, small-scale motion is excluded from the Navier–Stokes equations by applying the filtering operation. It is then modeled using subgrid models. In two-dimensional and three-dimensional cases, various types of filters are used: a box filter, a Gaussian filter and a Fourier filter, with a gradual decrease in the filter width. This enables the reproduction of a wider frequency range of fluctuations of the solution. The natural data obtained during the expedition in the Central-Eastern part of the Sea of Azov and in the Taganrog Bay at the research vessel Deneb of the Southern Scientific Center of the Russian Academy of Sciences were subjected to the filtration procedure. The hydrophysical ADCP probe Workhorse Sentinel 600 was used to measure the three-dimensional velocity vector of the water medium. In this way more than 3,000,000 initial measurements were obtained, at each of the 17 stations more than 150,000 were taken. The data thus obtained will be used for the digital simulation of three-dimensional turbulent flows using the LES approach and comparison with the results of averaging by RANS.Исследование выполнено за счет гранта Российского научного фонда № 22-71-00015, https://rscf.ru/project/22-71-00015/
Ідеологія бізнесу як рефлексивна реакція на соціально-економічні реалії в умовах конструктивної дестабілізації
No full textV. Prokhorova: ORCID 0000-0003-2552-2131; V. Protsenko: ORCID 0000-0003-4299-1298; O. Bozhanova: ORCID 0000-0003-2927-7356; A. Protsenko: ORCID 0000-0002-8073-9184ENG: The aim of the study is to generalize the theoretical and applied aspects of the formation of an ideological space of a unified nature as a reflexive reaction of business to socioeconomic realities in conditions of constructive destabilization. Based on the carried out analysis of statistical data, it is proved that a fundamentally new direction comes into being for domestic economic science, i. e., studies of business behavior for the faster recovery of the country’s economy, which requires the formalization of adequate instruments of a modern manager. Analyzing, systematizing and generalizing the scientific works of many scholars, the views of researchers on the definition of the concept of «ideology» were systematized, the principles of business ideology were allocated, the goal, types, signs, functions, principles, methods of ideological influence within the framework of building the ideology of management were defined. The presented publication forms theoretical and applied aspects of the ideological space of a unified nature as a reflexive reaction of business to socioeconomic realities. The issue of reflection as a system of reactions to socioeconomic realities is examined. The article considers the forms of reflection, the objective etiology of the formation of spheres of reflection through the prism of multidisciplinary connections. It is proved that the forms of reflection as a system of business reaction to socioeconomic realities in conditions of constructive destabilization have a tactical and strategic result. For a clear understanding and detailed analysis of the behavior of the problem under study, a block diagram of causal relationships is built. It is proved that reflection is an instrument for influencing the development of emotional intelligence, which explains the nature of the analytical choice of an alternative solution to the subject of economic relations and determines the possibilities of consolidated external information influence on this choice. Of practical importance is the universal model of the cognitive map of the behavioral model of business structures, which allows to explain the multi-vector format of development in rational, limited rational and irrational dimensions, combining the features of the model of constructive development of the destabilizing format and crisis phenomena.UKR: Метою дослідження є узагальнення теоретико-прикладних аспектів формування ідеологічного простору уніфікованого характеру як рефлексивної реакції бізнесу на соціально-економічні реалії в умовах конструктивної дестабілізації. На підставі проведеного аналізу статистичних даних доведено, що виникає принципово новий напрямок для вітчизняної економічної науки як дослідження поведінки бізнесу для скорішого відновлення економіки країни, що потребує формалізації адекватного інструментарію сучасного управлінця. Аналізуючи, систематизуючи та узагальнюючи наукові праці багатьох учених, було систематизовано погляди дослідників на визначення поняття «ідеологія», виділено принципи ідеології бізнесу, визначено мету, види, ознаки, функції, принципи, методи ідеологічного впливу в межах побудови ідеології управління. У роботі сформовано теоретико-прикладні аспекти ідеологічного простору уніфікованого характеру як рефлексивної реакції бізнесу на соціально-економічні реалії. Вивчено питання рефлексії як системи реакцій на соціально-економічні реалії. Розглянуто форми рефлексій, об’єктивну етіологію формування сфер рефлексії через призму мультипредметних зв’язків. Доведено, що форми рефлексії як система реакції бізнесу на соціально-економічні реалії в умовах конструктивної дестабілізації мають тактичний і стратегічний результат. Для чіткого розуміння та детального аналізу поведінки досліджуваної проблеми побудовано структурну схему причинно-наслідкових зв’язків. Доведено, що рефлексія є інструментом впливу на розвиток емоційного інтелекту, яка пояснює природу аналітичного вибору альтернативного рішення суб’єкта економічних відносин і визначає можливості консолідованого зовнішнього інформаційного впливу на цей вибір. Практичне значення має універсальна модель когнітивної карти поведінкової моделі структур бізнесу, яка дозволяє пояснити багатовекторний формат розвитку в раціональному, обмежено раціональному та ірраціональному вимірах, поєднуючи ознаки моделі конструктивного розвитку дестабілізаційного формату, кризових явищ.Ukrainian Engineering and Pedagogical Academy, Kharkіv, Ukraine; r, Odesa National Medical University, Odesa, Ukrain
Електроосадження та характеристика електрокаталізатора для покращеного окислення карбаміду в зеленій водневій енергетиці за участю Des
No full textТ. Butyrina: ORCID 0000-0002-0619-6783
V. Protsenko: ORCID 0000-0002-5959-0426En: An important task of modern materials science is the development of highly efficient electrocatalysts for green hydrogen production. Specifically, this involves the urea oxidation reaction
(UOR), which is an energetically advantageous and attractive alternative to the anodic oxygen evolution reaction, coupled with hydrogen evolution at the cathode. In this work, we present for the first time the use of systems based on a new generation of environmentally friendly room-temperature ionic liquids – deep eutectic solvents (DESs) – for the electrodeposition of electrocatalysts for UOR. The electrochemical performance of electrodeposited nanocomposite Ni–CeO2 electrocatalysts was evaluated in alkaline solution, showing an appreciable reduction in the anodic potential of UOR compared to oxygen evolution, reaching up to approximately 0.2 V at a current density of 0.1 mA cm–2. The obtained results are significant for the development of electrochemical synthesisKarpenko Physico-Mechanical Institute of the NAS of Ukraine, Lviv, Ukrain
Methodological aspects of providing resources for creation of economic security at companies
No full textThe purpose of the research is in the coverage of content and specific costs for long-term economic security, as well as the justification criteria of accessing these costs in different stages of the life cycle of industrial enterprises. The article shows the objective need to create conditions for sustained development and economic security of domestic production, which is possible only by deliberate, conscious actions of long-term and program character. The major object of expenses enhance the economic security of enterprises is considered the technical, technological, organizational, economic and financial system at the stages of creation, maintenance and improvement. The author works out the criteria for accessing costs to ensure the economic security of industrial enterprises at different stages of their life cycle. The article shows the basic forms of loss of economic security of companies and its reproducing at the expense of the reserves established. It is shown that investments into the creation of reserves should be performed during the creation of the enterprise itself, and operating costs are made directly during operation. The author offers the technique of economic security index as the value of operating costs reserves of the company
Innovative activity – basis for economic security of enterprise
No full textThe aim of the research is to highlight the contents and specifics of innovation processes management mechanism on enterprises and to substantiate the scheduled management system of innovation process and to develop the complex system of innovation management.
The objective necessity of innovative ensuring of industrial enterprises stable functioning is shown, the author’s innovation numerical score which is based on the level of novelty and difficulty of the solved task is given. The classification of innovation by types: technical, technological, organizational, managerial, economic, social is proposed by author. The system of indicators, which characterize the industrial enterprises innovation activity level is developed. The system includes: total quantity of innovations applied, scores of use, comparative indicator of application intensity, innovations importance, productivity increase due to innovations, material resources use decrease due to innovations, production casts decrease, innovation products volume in total production. The essence of the developed by author scheduled management system of innovation process on machine – building enterprise on the base of network matrix is revealed.
This will allow to apply more rational model of investment-innovative development of the enterprise management on industrial enterprises
Searching Malware and Sources of Its Distribution in the Internet
No full textIn the article is considered for the first time developed by the author algorithm of searching malware and sources of its distribution, based on published HijackThis logs in the Internet
Corrigendum to isolation and phylogenetic analysis of SARS-CoV-2 variants collected in Russia during the COVID-19 outbreak [Int. J. Infect. Dis. 99 (2020) 40-46] (International Journal of Infectious Diseases (2020) 99(40-46) (S120197122030566X), (10.1016/j.ijid.2020.07.024))
No full textThe authors regret that the affiliation for Egor Prokhortchoukd was incorrect. This has now been corrected as above. The authors would like to apologise for any inconvenience caused. © 2020 The Author(s
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