Spatio-temporal data processing of automated geodynamic monitoring system

System In this paper, an approach to the organization of spatial-temporal processing of geoelectrical data in the system of automated geodynamic control is considered. It allows combining methodical, algorithmic, program and information support of the processes of collecting and processing of geodynamic information at subjects to contro

A Method and a Device for Diagnostics of the Functional State of Peripheral Vessels of the Upper Limbs

The article suggests a method and a device for diagnostics of the functional state of peripheral vessels of the upper limbs, which provide identification of angiospastic disorders with a lower probability of falsenegative result, allowing thereby the quality of diagnostics to be improved. The suggested approach is based on combined application of laser Doppler flowmetry and contact thermometry during an occlusion test. The obtained results can be used in various fields of medicine for the development of multifunctional noninvasive diagnostic systems for the diagnosis and prevention of diseases associated with changes in the functional state of peripheral vessels

Применение аппроксимации спектров для моделирования динамических свойств беспроводных каналов связи

This work is devoted to the application of approximation methods for modeling wireless radio communication channels. The rationale and prospects of the use of unmanned aerial vehicles as part of flying self-organizing networks for the transmission of high-speed information in the conditions of «smart cities» are demonstrated. The problem of using these networks is also referred, associated with the technical complexity of ensuring acceptable reliability and quality of wireless communication, associated with the multipath of signal propagation and a number of other factors. It is shown that in this aspect, the development of mathematical modeling methods of analyzing signals at the inputs of UAV radio receivers in order to evaluate their amplitude- phase transformations by a communication channel is of special significance. It has been established that the connection between the signals on the transmitting and receiving sides of an arbitrary wireless radio communication channel, assuming its linearity, can be uniquely determined by a complex transfer function in the frequency domain, which in practice is very complex and difficult to describe analytically. In this regard, an approach to its approximation by an equivalent model, described by fractional- rational functions of a complex variable, physically realized by mixed connections of various linear inertial and inertial links, is proposed, and for modeling dynamic characteristics, a numerical-a nalytical modeling technique based on the spectral method and piecewise linear approximation. A results of applying the proposed solutions are shown. Surzhik D. I., Vasilyev G. S., Kuzichkin O. R., Koskin A. V., Fedorov V. I. Application of spectral approximation to model the dynamic properties of wireless communication channels. Ural Radio Engineering Journal. 2023;7(3):318–333. (In Russ.) DOI: 10.15826/urej.2023.7.3.006Данная работа посвящена применению методов аппроксимации для моделирования беспроводных радиоканалов связи. Показана актуальность и перспективность применения беспилотных летательных аппаратов в составе летающих самоорганизующихся сетей для передачи высокоскоростной информации в условиях «умных городов». Отмечена также и проблема использования данных сетей, связанная с технической сложностью обеспечения приемлемой надежности и качества беспроводной связи, связанная с многолучевостью распространения сигналов и рядом других факторов. Показано, что в данном аспекте особую актуальность представляет развитие методов математического моделирования для анализа сигналов на входах радиоприемников БПЛА для оценки их амплитудно-фазовых преобразований каналом связи. Установлено, что связь между сигналами на передающей и приемной стороне произвольного беспроводного радиоканала связи в предположении о его линейности может однозначно определяться комплексной передаточной функцией в частотной области, которая на практике является весьма сложной и плохо поддается аналитическому описанию. В связи с этим предложен подход к ее аппроксимации эквивалентной моделью, описываемой дробно-рациональными функциями комплексного переменного, физически реализуемыми смешанными соединениями различных линейных инерционных и безынерционных звеньев, а для моделирования динамических характеристик — методика численно- аналитического моделирования на основе спектрального метода и кусочно-линейной аппроксимации. Показаны результаты применения предложенных решений. Суржик Д. И., Васильев Г. С., Кузичкин О. Р., Коськин А. В., Федоров В. И. Применение аппроксимации спектров для моделирования динамических свойств беспроводных каналов связи. Ural Radio Engineering Journal. 2023;7(3):318–333. DOI: 10.15826/urej.2023.7.3.00

Prospects for Establishment of Technological Complexes in Machine Building Industry on The Basis of Electromechatronic Propulsion Systems

The authors consider prospects for technological complex establishment in machine building industry on the basis of electromechatronic propulsion systems for production of innovative products with different novelty levels: world, state, brunch, region, etc

Long-range exciton transport in brightly fluorescent furan/phenylene co-oligomer crystals

The design of light-emitting crystalline organic semiconductors for optoelectronic applications requires a thorough understanding of the singlet exciton transport process. In this study, we show that the singlet exciton diffusion length in a promising semiconductor crystal based on furan/phenylene co-oligomers is 24 nm. To achieve this, we employed the photoluminescence quenching technique using a specially synthesized quencher, which is a long furan/phenylene co-oligomer that was facilely implanted into the host crystal lattice. Extensive Monte-Carlo simulations, exciton-exciton annihilation experiments and numerical modelling fully supported our findings. We further demonstrated the high potential of the furan/phenylene co-oligomer crystals for light-emitting applications by fabricating solution-processed organic light emitting transistors

Application of spectral approximation to model the dynamic properties of wireless communication channels

Поступила: 04.08.2023. Принята в печать: 12.09.2023.Received: 04.08.2023. Accepted: 12.09.2023.Данная работа посвящена применению методов аппроксимации для моделирования беспроводных радиоканалов связи. Показана актуальность и перспективность применения беспилотных летательных аппаратов в составе летающих самоорганизующихся сетей для передачи высокоскоростной информации в условиях «умных городов». Отмечена также и проблема использования данных сетей, связанная с технической сложностью обеспечения приемлемой надежности и качества беспроводной связи, связанная с многолучевостью распространения сигналов и рядом других факторов. Показано, что в данном аспекте особую актуальность представляет развитие методов математического моделирования для анализа сигналов на входах радиоприемников БПЛА для оценки их амплитудно-фазовых преобразований каналом связи. Установлено, что связь между сигналами на передающей и приемной стороне произвольного беспроводного радиоканала связи в предположении о его линейности может однозначно определяться комплексной передаточной функцией в частотной области, которая на практике является весьма сложной и плохо поддается аналитическому описанию. В связи с этим предложен подход к ее аппроксимации эквивалентной моделью, описываемой дробно-рациональными функциями комплексного переменного, физически реализуемыми смешанными соединениями различных линейных инерционных и безынерционных звеньев, а для моделирования динамических характеристик — методика численно-аналитического моделирования на основе спектрального метода и кусочно-линейной аппроксимации. Показаны результаты применения предложенных решений.This work is devoted to the application of approximation methods for modeling wireless radio communication channels. The rationale and prospects of the use of unmanned aerial vehicles as part of flying self-organizing networks for the transmission of high-speed information in the conditions of «smart cities» are demonstrated. The problem of using these networks is also referred, associated with the technical complexity of ensuring acceptable reliability and quality of wireless communication, associated with the multipath of signal propagation and a number of other factors. It is shown that in this aspect, the development of mathematical modeling methods of analyzing signals at the inputs of UAV radio receivers in order to evaluate their amplitude-phase transformations by a communication channel is of special significance. It has been established that the connection between the signals on the transmitting and receiving sides of an arbitrary wireless radio communication channel, assuming its linearity, can be uniquely determined by a complex transfer function in the frequency domain, which in practice is very complex and difficult to describe analytically. In this regard, an approach to its approximation by an equivalent model, described by fractional-rational functions of a complex variable, physically realized by mixed connections of various linear inertial and inertial links, is proposed, and for modeling dynamic characteristics, a numerical-analytical modeling technique based on the spectral method and piecewise linear approximation. A results of applying the proposed solutions are shown.Работа поддержана стипендией Президента РФ СП‑4829.2021.3 «Повышение качественных показателей современных космических телекоммуникационных систем путем улучшения характеристик их радиопередающей аппаратуры». Теория подготовлена в рамках государственного задания РФ «Исследование и разработка комплексных энергосберегающих и термоэлектрических регенеративных систем» заявка № 2019-1497, № FZWG‑2020-0034.The work was supported by the Russian Federation Presidential Scholarship SP‑4829.2021.3 “Improving the quality indicators of modern space telecommunication systems by improving the characteristics of their radio transmitting equipment.” The theory was prepared within the framework of the state assignment of the Russian Federation “Research and development of integrated energy-saving and thermoelectric regenerative systems” application No. 2019-1497, No. FZWG‑2020-0034

Types of aeroelastic vibrations of turbomachinery bladed discs

A real process was analyzed for presence of self-oscillations. Absence of self-oscillations was revealed as its attributes such as progressive wave and beating were not discovered. A model of oscillatory process was proposed on the basis of the kind of oscillograms and the linear superposition theory for several simultaneously excited oscillation modes. In accordance with the theory two vibrations with frequencies equal to 919 and 469Hz were summed up. As a result of addition of these frequencies and comparison of the derived oscillograms with the real process it was found that the proposed model agrees with the original well enough. Moving further into the process, a third frequency component equal to 1002Hz originates in addition to those of 465 and 918 Hz. Addition of three frequencies carried out similarly to the first example also yields a satisfactory result. Oscillograms of real and model processes have a similar appearance. The frequency components calculated on the basis of the oscillogram of the model process practically coincided with the real process frequencies. Classification of aeroelastic oscillations was analyzed in order to determine the oscillatory type of the process under investigation. Three main phenomena were distinguished: forced oscillations, flutter and non-synchronous oscillations. Almost all foreign engine companies faced the latter phenomenon, sometimes mistaken for flutter. The analyzed example was labeled as non-synchronous oscillations according to features of non-synchronous oscillations, namely, aliquant rotation frequency and resonant behavior of oscillations

Technical aspects of creation of hel`s service-oriented IT-infrastructure

A model of building IT-infrastructure of the educational as a set of independent specialized services is propose

Spatio-temporal data processing of automated geodynamic monitoring system

System In this paper, an approach to the organization of spatial-temporal processing of geoelectrical data in the system of automated geodynamic control is considered. It allows combining methodical, algorithmic, program and information support of the processes of collecting and processing of geodynamic information at subjects to contro

Technical aspects of creation of hel`s service-oriented IT-infrastructure

A model of building IT-infrastructure of the educational as a set of independent specialized services is propose