Pub Date : 2023-09-28DOI: 10.17725/rensit.2023.15.263
Elena F. Sheka
Presented is a concentrated synopsis of facilities of empirical and virtual analytics that, once applied, have provided a fully new vision of sp2 amorphous carbons. This study proved that the solids are multilevel structures, started with the first-level basic structural units (BSUs) and accomplished as macroscopic agglomerates of globular structures, consisting, in its turn, of stacked BSUs. BSUs present necklaced graphene molecules, size, and shape of which are governed by the relevant graphene domains while chemical composition in addition to basic carbon is controlled with heteroatoms of the necklaces. This study shows that BSUs and stacks of BSUs determine the short-range order of the solids and are the main subject of the applied analytics. The synopsis consists of two parts related to empirical and virtual analytics. The former is composed of sections related to structural determination, total and atomic chemical content evaluation and elicitation of the covalent bond composition. The second presents new analytic approaches based on the Digital Twins concept and virtual vibrational spectrometry. The synopsis is configured as an atlas composed of generalized pictures accompanied with necessary explanations to be discussed in detail in the extended references.
{"title":"A Neoteric View of sp2 Amorphous Carbon","authors":"Elena F. Sheka","doi":"10.17725/rensit.2023.15.263","DOIUrl":"https://doi.org/10.17725/rensit.2023.15.263","url":null,"abstract":"Presented is a concentrated synopsis of facilities of empirical and virtual analytics that, once applied, have provided a fully new vision of sp2 amorphous carbons. This study proved that the solids are multilevel structures, started with the first-level basic structural units (BSUs) and accomplished as macroscopic agglomerates of globular structures, consisting, in its turn, of stacked BSUs. BSUs present necklaced graphene molecules, size, and shape of which are governed by the relevant graphene domains while chemical composition in addition to basic carbon is controlled with heteroatoms of the necklaces. This study shows that BSUs and stacks of BSUs determine the short-range order of the solids and are the main subject of the applied analytics. The synopsis consists of two parts related to empirical and virtual analytics. The former is composed of sections related to structural determination, total and atomic chemical content evaluation and elicitation of the covalent bond composition. The second presents new analytic approaches based on the Digital Twins concept and virtual vibrational spectrometry. The synopsis is configured as an atlas composed of generalized pictures accompanied with necessary explanations to be discussed in detail in the extended references.","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135342874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-28DOI: 10.17725/rensit.2023.15.295
Iliya A. Gorbachev, Andrey V. Smirnov, Iren E. Kuznetsova, Vladimir V. Kolesov
The effect of the subphase temperature on the formation of nickel arachinate clusters under a monolayer of arachidic acid was studied. The subphase temperature varied in the range from 10° to 30°C with a step of 4°C. The influence of temperature on the compressibility of the monolayer and the area occupied by one molecule in the Langmuir monolayer of nickel araquinate is demonstrated. The effect of temperature on the morphology of Langmuir-Blodgett films formed on their basis was also studied. It was found that, as the temperature changes, the number of nickel clusters increases and their sizes decrease. This is due to a change in the rate of growth and dissolution of clusters with a change in temperature. The distribution of clusters in the resulting film was random, however, they can be structured using external magnetic fields. Using the magnetic properties of NiArch clusters will make it possible to purposefully change the film structure by an external magnetic field. The results obtained are of great importance for practical applications in the creation of multilayer composite coatings with controlled magnetic properties. These films can be further used as touch coatings for acoustic and electronic sensors.
{"title":"Temperature influence on the formation of Langmuir monolayers with Ni arachidic acid and Ni arachidate clusters","authors":"Iliya A. Gorbachev, Andrey V. Smirnov, Iren E. Kuznetsova, Vladimir V. Kolesov","doi":"10.17725/rensit.2023.15.295","DOIUrl":"https://doi.org/10.17725/rensit.2023.15.295","url":null,"abstract":"The effect of the subphase temperature on the formation of nickel arachinate clusters under a monolayer of arachidic acid was studied. The subphase temperature varied in the range from 10° to 30°C with a step of 4°C. The influence of temperature on the compressibility of the monolayer and the area occupied by one molecule in the Langmuir monolayer of nickel araquinate is demonstrated. The effect of temperature on the morphology of Langmuir-Blodgett films formed on their basis was also studied. It was found that, as the temperature changes, the number of nickel clusters increases and their sizes decrease. This is due to a change in the rate of growth and dissolution of clusters with a change in temperature. The distribution of clusters in the resulting film was random, however, they can be structured using external magnetic fields. Using the magnetic properties of NiArch clusters will make it possible to purposefully change the film structure by an external magnetic field. The results obtained are of great importance for practical applications in the creation of multilayer composite coatings with controlled magnetic properties. These films can be further used as touch coatings for acoustic and electronic sensors.","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135342876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-28DOI: 10.17725/rensit.2023.15.307
Iliya A. Gorbachev, Andrey V. Smirnov
The work examined the sensor properties of a biofilm based on phospholipid molecules 1,2-dipalmitoyl-sn-glycero-3-phosphoethanolamine with immobilized molecules of the enzyme alcohol oxidase to vapors of ethyl and isopropyl alcohols. The immobilization of alcohol oxidase enzyme molecules was carried out using a Langmuir monolayer process of phospholipid molecules. The sensor coating was obtained using the Langmuir-Schaeffer technology, in which the substrate is oriented parallel to the monolayer. The analysis of microimages of the film surface obtained by atomic force microscopy, allows to present of enzyme molecules in it was established. The study of the sensory properties of the formed coatings was carried out using acoustoelectronic technology. The presence of the enzyme in the sensor coating led to an increase in the amplitude and phase responses of the acoustic delay line when interacting with vapors of the detected substance. The maximum amplitude and phase responses were recorded when the film interacted with ethanol vapor and were 1.5 dB and 19°, respectively. The work showed that the formed sensor coating has selective sensitivity to ethanol vapor. This allows us to conclude that it is possible to use this sensor coating to create an acoustoelectronic ethanol biosensor. Increasing the sensitivity of such biosensors can be achieved by varying technological parameters such as the number of layers in the film, as well as the amount of immobilized enzyme in each layer.
{"title":"Biosensor based on Langmuir-Blodgett film with alcohol oxidase enzyme","authors":"Iliya A. Gorbachev, Andrey V. Smirnov","doi":"10.17725/rensit.2023.15.307","DOIUrl":"https://doi.org/10.17725/rensit.2023.15.307","url":null,"abstract":"The work examined the sensor properties of a biofilm based on phospholipid molecules 1,2-dipalmitoyl-sn-glycero-3-phosphoethanolamine with immobilized molecules of the enzyme alcohol oxidase to vapors of ethyl and isopropyl alcohols. The immobilization of alcohol oxidase enzyme molecules was carried out using a Langmuir monolayer process of phospholipid molecules. The sensor coating was obtained using the Langmuir-Schaeffer technology, in which the substrate is oriented parallel to the monolayer. The analysis of microimages of the film surface obtained by atomic force microscopy, allows to present of enzyme molecules in it was established. The study of the sensory properties of the formed coatings was carried out using acoustoelectronic technology. The presence of the enzyme in the sensor coating led to an increase in the amplitude and phase responses of the acoustic delay line when interacting with vapors of the detected substance. The maximum amplitude and phase responses were recorded when the film interacted with ethanol vapor and were 1.5 dB and 19°, respectively. The work showed that the formed sensor coating has selective sensitivity to ethanol vapor. This allows us to conclude that it is possible to use this sensor coating to create an acoustoelectronic ethanol biosensor. Increasing the sensitivity of such biosensors can be achieved by varying technological parameters such as the number of layers in the film, as well as the amount of immobilized enzyme in each layer.","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"148 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135342882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-28DOI: 10.17725/rensit.2023.15.335
Vladimir I. Grachev
Information is presented on the organization and activities of Kotelnikov Institute of Radioengineering and Electronics of Russian Academy of Sciences. Its scientific directions are covered, the main results of fundamental scientific, exploratory and applied research are noted, as well as the training of highly qualified personnel (candidates and doctors of science) and the presence of close international scientific ties.
{"title":"70 years of Kotelnikov Institute of Radioengineering and Electronics of RAS","authors":"Vladimir I. Grachev","doi":"10.17725/rensit.2023.15.335","DOIUrl":"https://doi.org/10.17725/rensit.2023.15.335","url":null,"abstract":"Information is presented on the organization and activities of Kotelnikov Institute of Radioengineering and Electronics of Russian Academy of Sciences. Its scientific directions are covered, the main results of fundamental scientific, exploratory and applied research are noted, as well as the training of highly qualified personnel (candidates and doctors of science) and the presence of close international scientific ties.","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135342877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-28DOI: 10.17725/rensit.2023.15.214
Vyacheslav A. Sergeev, Vitaliy I. Smirnov, Andrey A. Gavrikov
The method of measuring the thermal resistance (TR) of semiconductor devices (SD) according to OST 11 0944-96 and the original modulation method implemented in the hardware and software package developed by the authors are described. In both methods, the SD is heated by pulsed power, and the temperature of its active region (transition) is determined by a change in the temperature–sensitive parameter (TSP) - the voltage at the SD at a low current passed through the SD in the pauses between the pulses of the heating current. The measurement error of the vehicle by the standard method strongly depends on the choice of the duration of the heating current pulses and the delay time when measuring the voltage at the SD after switching off the heating current. In the modulation method, the duration of the heating current pulses is changed according to the harmonic law, and according to the results of measuring the voltage at the SD during the passage of the heating and measuring current, the modulus of the thermal impedance of the SD is determined as the ratio of the first harmonic of the transition temperature to the first harmonic of the heating power. According to the frequency dependence of the thermal impedance module, the components of the vehicle of the object are determined, while the requirements for maintaining the temperature of the device body are significantly reduced and, as a result, the measurement error of the vehicle is reduced. The results of comparative measurements of the TR of integrated microwave amplifiers (amplifying cascades) on InGaP/GaP HBT by the standard and modulation method at different values of the amplitude of the heating current are presented. It is shown that the results of measuring the TR of integrated microwave amplifiers by both methods are in good agreement with each other. It is established that with an increase in the amplitude of the heating current, the TR junction-case of integrated microwave amplifiers decreases, which is due to the alignment of current distribution in the structure of the GBT during heating.
{"title":"Methods and features of measuring the thermal resistance of integrated microwave amplifiers on heterojunction bipolar transistors","authors":"Vyacheslav A. Sergeev, Vitaliy I. Smirnov, Andrey A. Gavrikov","doi":"10.17725/rensit.2023.15.214","DOIUrl":"https://doi.org/10.17725/rensit.2023.15.214","url":null,"abstract":"The method of measuring the thermal resistance (TR) of semiconductor devices (SD) according to OST 11 0944-96 and the original modulation method implemented in the hardware and software package developed by the authors are described. In both methods, the SD is heated by pulsed power, and the temperature of its active region (transition) is determined by a change in the temperature–sensitive parameter (TSP) - the voltage at the SD at a low current passed through the SD in the pauses between the pulses of the heating current. The measurement error of the vehicle by the standard method strongly depends on the choice of the duration of the heating current pulses and the delay time when measuring the voltage at the SD after switching off the heating current. In the modulation method, the duration of the heating current pulses is changed according to the harmonic law, and according to the results of measuring the voltage at the SD during the passage of the heating and measuring current, the modulus of the thermal impedance of the SD is determined as the ratio of the first harmonic of the transition temperature to the first harmonic of the heating power. According to the frequency dependence of the thermal impedance module, the components of the vehicle of the object are determined, while the requirements for maintaining the temperature of the device body are significantly reduced and, as a result, the measurement error of the vehicle is reduced. The results of comparative measurements of the TR of integrated microwave amplifiers (amplifying cascades) on InGaP/GaP HBT by the standard and modulation method at different values of the amplitude of the heating current are presented. It is shown that the results of measuring the TR of integrated microwave amplifiers by both methods are in good agreement with each other. It is established that with an increase in the amplitude of the heating current, the TR junction-case of integrated microwave amplifiers decreases, which is due to the alignment of current distribution in the structure of the GBT during heating.","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135342864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-28DOI: 10.17725/rensit.2023.15.317
Venedikt M. Kuz'kin, Sergey A. Pereselkov, Vladimir I. Grachev, Sergey A. Tkachenko, Nikolay V. Ladykin, Mikhail V. Kutsov
Within the framework of a numerical experiment, the holographic processing of noise emission from a moving underwater sound source in the presence of intense internal waves, which cause horizontal refraction of sound field waves, is considered. The interference of the undisturbed and disturbed fields forms a moiré interference pattern (interferogram) that masks the interferogram of a noise source. Registration of a moiré interferogram using a two-dimensional Fourier transform makes it possible to separate the spectral densities of the unperturbed and perturbed fields. This makes it possible to reconstruct the interferogram of the unperturbed field in the presence of intense internal waves. The relative error of its reconstruction is estimated. The errors in reconstructing the range and radial velocity of the source due to horizontal refraction are analyzed.
{"title":"Holographic Method for Localization of a Moving Underwater Sound Source in the Presence of Intense Internal Waves","authors":"Venedikt M. Kuz'kin, Sergey A. Pereselkov, Vladimir I. Grachev, Sergey A. Tkachenko, Nikolay V. Ladykin, Mikhail V. Kutsov","doi":"10.17725/rensit.2023.15.317","DOIUrl":"https://doi.org/10.17725/rensit.2023.15.317","url":null,"abstract":"Within the framework of a numerical experiment, the holographic processing of noise emission from a moving underwater sound source in the presence of intense internal waves, which cause horizontal refraction of sound field waves, is considered. The interference of the undisturbed and disturbed fields forms a moiré interference pattern (interferogram) that masks the interferogram of a noise source. Registration of a moiré interferogram using a two-dimensional Fourier transform makes it possible to separate the spectral densities of the unperturbed and perturbed fields. This makes it possible to reconstruct the interferogram of the unperturbed field in the presence of intense internal waves. The relative error of its reconstruction is estimated. The errors in reconstructing the range and radial velocity of the source due to horizontal refraction are analyzed.","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135342870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-28DOI: 10.17725/rensit.2023.15.235
Mikhail G. Bakulin, Vitaly B. Kreyndelin, Andrey A. Reznev
Various methods of generating of space-time codes and algebraic structures for increasing noise immunity of MIMO communication systems with a large number of transmitting and receiving antennas are considered. The possibility of generation of an orthogonal precoding matrix in MIMO systems depending on changing reception conditions in a radio channel using feedback from a transmitter to a receiver is shown. It is obtained that to transmit such a precoding matrix in MIMO systems with 4×4, 8×8, 16×16 antenna configurations, feedback is required with the ability to transmit only 2 bits on the reverse link at an energy gain of 1.5 dB ... 2.5 dB compared to an open loop system. The precoding matrices obtained in the article and their formation algorithms can be used in the development of new MIMO mobile communication systems.
{"title":"Extended orthogonal feedback precoding for spatial multiplexing systems","authors":"Mikhail G. Bakulin, Vitaly B. Kreyndelin, Andrey A. Reznev","doi":"10.17725/rensit.2023.15.235","DOIUrl":"https://doi.org/10.17725/rensit.2023.15.235","url":null,"abstract":"Various methods of generating of space-time codes and algebraic structures for increasing noise immunity of MIMO communication systems with a large number of transmitting and receiving antennas are considered. The possibility of generation of an orthogonal precoding matrix in MIMO systems depending on changing reception conditions in a radio channel using feedback from a transmitter to a receiver is shown. It is obtained that to transmit such a precoding matrix in MIMO systems with 4×4, 8×8, 16×16 antenna configurations, feedback is required with the ability to transmit only 2 bits on the reverse link at an energy gain of 1.5 dB ... 2.5 dB compared to an open loop system. The precoding matrices obtained in the article and their formation algorithms can be used in the development of new MIMO mobile communication systems.","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135342867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-28DOI: 10.17725/rensit.2023.15.327
Alexander V. Kokoshkin, Evgeny P. Novichikhin
Testing of digital images restoration by methods of sequentially calculated Fourier spectrum interpolation, spline interpolation, projections onto convex sets and amplitude iterations is proposed. The task is a reconstruction of the sparseness modeled according to the randomly uniform law (90 percent of the information is missing). In addition to the well-known image quality estimates, new ones are introduced - a measure of histogram similarity, the rms deviation of the difference in phase spectra. It is shown that the proposed criteria are effective for assessing the quality of images obtained by remote sensing.
{"title":"Evaluation of images quality obtained by remote sensing","authors":"Alexander V. Kokoshkin, Evgeny P. Novichikhin","doi":"10.17725/rensit.2023.15.327","DOIUrl":"https://doi.org/10.17725/rensit.2023.15.327","url":null,"abstract":"Testing of digital images restoration by methods of sequentially calculated Fourier spectrum interpolation, spline interpolation, projections onto convex sets and amplitude iterations is proposed. The task is a reconstruction of the sparseness modeled according to the randomly uniform law (90 percent of the information is missing). In addition to the well-known image quality estimates, new ones are introduced - a measure of histogram similarity, the rms deviation of the difference in phase spectra. It is shown that the proposed criteria are effective for assessing the quality of images obtained by remote sensing.","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135342901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-28DOI: 10.17725/rensit.2023.15.253
Yuriy V. Obukhov, Ivan A. Kershner, Irina V. Okuneva, Mikhail V. Sinkin
An algorithm for automatic detection of epileptiform activity in EEG monitoring data with delayed ischemia after hemorrhage in the subarachnoid space of the brain is proposed and described. The algorithm is based on the formalization of the visual characteristics of epileptiform activity in the form of a peak-wave discharge pattern and analysis of the mutual correlation of multichannel EEG signals with the selected pattern. Fragments of epileptiform activity in each pair of bipolar electrodes were determined from three conditions according to the description of peak-wave discharges of epileptiform activity: 1) the value of positive mutual correlation at the peak of the correlation function should be greater than 0.4; 2) a positive peak of mutual correlation should be followed by a peak with a negative correlation; 3) the width of the peak of negative mutual correlation at half-altitude should be at least 2 times greater than that of the previous positive peak of positive mutual correlation. As with the visual detection of epileptiform activity, the neurophysiologist selected simultaneous peak-wave discharges in several bipolar electrodes. The results of testing the algorithm on an hour-long EEG recording of a patient with delayed ischemia are presented. Fragments with epileptiform activity during the hour under review were identified 17 in the right hemisphere and 2 in the left. Interhemispheric asymmetry is caused by a right-sided aneurysm in patient. The operating time of the algorithm on a modern personal computer is no more than 5 minutes to process 16 bipolar signals, so it can be used to calculate the hourly amount of epileptiform activity in almost real time of the manifestation of this indicator of delayed ischemia after aneurysmal subarachnoid hemorrhage.
{"title":"Algorithm for detecting epileptiform EEG activity in delayed cerebral ischemia","authors":"Yuriy V. Obukhov, Ivan A. Kershner, Irina V. Okuneva, Mikhail V. Sinkin","doi":"10.17725/rensit.2023.15.253","DOIUrl":"https://doi.org/10.17725/rensit.2023.15.253","url":null,"abstract":"An algorithm for automatic detection of epileptiform activity in EEG monitoring data with delayed ischemia after hemorrhage in the subarachnoid space of the brain is proposed and described. The algorithm is based on the formalization of the visual characteristics of epileptiform activity in the form of a peak-wave discharge pattern and analysis of the mutual correlation of multichannel EEG signals with the selected pattern. Fragments of epileptiform activity in each pair of bipolar electrodes were determined from three conditions according to the description of peak-wave discharges of epileptiform activity: 1) the value of positive mutual correlation at the peak of the correlation function should be greater than 0.4; 2) a positive peak of mutual correlation should be followed by a peak with a negative correlation; 3) the width of the peak of negative mutual correlation at half-altitude should be at least 2 times greater than that of the previous positive peak of positive mutual correlation. As with the visual detection of epileptiform activity, the neurophysiologist selected simultaneous peak-wave discharges in several bipolar electrodes. The results of testing the algorithm on an hour-long EEG recording of a patient with delayed ischemia are presented. Fragments with epileptiform activity during the hour under review were identified 17 in the right hemisphere and 2 in the left. Interhemispheric asymmetry is caused by a right-sided aneurysm in patient. The operating time of the algorithm on a modern personal computer is no more than 5 minutes to process 16 bipolar signals, so it can be used to calculate the hourly amount of epileptiform activity in almost real time of the manifestation of this indicator of delayed ischemia after aneurysmal subarachnoid hemorrhage.","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135342905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-28DOI: 10.17725/rensit.2023.15.205
Yuaroslav V. Kravchenko, Dmitry Yu. Tsipenyuk, Andrey V. Voropinov
The paper presents first results obtained on an experimental setup designed to study the parameters of localization, scattering and absorption of microwave radiation with a power of 1-4 mW at the 38 GHz when radiation propagates in variable-section waveguides. The parameters of localization and scattering of an electromagnetic wave in a partially absorbing medium were studied depending on the geometric configuration of the output tract. The interpretation of the obtained initial results was carried out within the framework of the (1+4)D extended space model (ESM). The extended space model is formulated in (1+4)-dimensional space time-coordinate-interval action. An additional spatial coordinate in the ESM is the interval, which in the ESM has the physical meaning of the action. In the dual (1+4)D space energy-momentum-mass, the interval (action) in the ESM corresponds to the mass. ESM considers the question of the emergence of a non-zero variable mass for a photon and its localization under the influence of an external field.
{"title":"Electromagnetic wave localization and scattering parameters investigation in a partially absorbing medium depending on the output tract geometric configuration.","authors":"Yuaroslav V. Kravchenko, Dmitry Yu. Tsipenyuk, Andrey V. Voropinov","doi":"10.17725/rensit.2023.15.205","DOIUrl":"https://doi.org/10.17725/rensit.2023.15.205","url":null,"abstract":"The paper presents first results obtained on an experimental setup designed to study the parameters of localization, scattering and absorption of microwave radiation with a power of 1-4 mW at the 38 GHz when radiation propagates in variable-section waveguides. The parameters of localization and scattering of an electromagnetic wave in a partially absorbing medium were studied depending on the geometric configuration of the output tract. The interpretation of the obtained initial results was carried out within the framework of the (1+4)D extended space model (ESM). The extended space model is formulated in (1+4)-dimensional space time-coordinate-interval action. An additional spatial coordinate in the ESM is the interval, which in the ESM has the physical meaning of the action. In the dual (1+4)D space energy-momentum-mass, the interval (action) in the ESM corresponds to the mass. ESM considers the question of the emergence of a non-zero variable mass for a photon and its localization under the influence of an external field.","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135343893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：