Radioelektronika, Nanosistemy, Informacionnye Tehnologii最新文献_第4页

Application of Chimeric Meshes for Explicit Accounting for Inhomogeneities in Modeling the Propagation of Elastic Waves 嵌合网格在弹性波传播模型中非均匀性计算中的应用

Radioelektronika, Nanosistemy, Informacionnye Tehnologii Pub Date : 2023-06-29 DOI: 10.17725/rensit.2023.15.185

I. Mitskovets

{"title":"Application of Chimeric Meshes for Explicit Accounting for Inhomogeneities in Modeling the Propagation of Elastic Waves","authors":"I. Mitskovets","doi":"10.17725/rensit.2023.15.185","DOIUrl":"https://doi.org/10.17725/rensit.2023.15.185","url":null,"abstract":"The method of chimeric meshes is applied to simulate the propagation of elastic perturbations in media containing porous and fractured inclusions. A model of a linearly elastic isotropic medium is considered, which describes the state of a geological rock. The grid-characteristic method with the third-order accurate Rusanov scheme is used for numerical modeling of the dynamic propagation of elastic disturbances. Special attention is paid to the presence of separate inclusions of pores or fractures, which introduce heterogeneity into the medium and can substantially influence the response of elastic disturbances. The use of the chimera grid method allows for both the position and shape of such inclusions to be described explicitly, taking into account their influence on the propagation of elastic disturbances. As a result of the conducted investigation, a methodology for numerical modeling of the propagation of elastic disturbances in media with porous and fractured inclusions was developed, which can be used to assess the influence of such inclusions on the dynamic response of elastic disturbances. The presented results can be applied in geophysical and seismic research related to modeling the dynamics of various processes in soils and rocks.","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74954473","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}

引用次数: 0

Control of the dynamics of spin polarization of conduction electrons by electrical and mechanical action 电学和力学作用对导电电子自旋极化动力学的控制

Radioelektronika, Nanosistemy, Informacionnye Tehnologii Pub Date : 2023-06-29 DOI: 10.17725/rensit.2023.15.133

V. Ignatiev, N. Lebedev, S. Perchenko, D. Stankevich

引用次数: 0

Dynamic thermoelectric model of a heterojunction bipolar transistor taking into account the voltage drop on the emitter metallization tracks 考虑发射极金属化轨道上电压降的异质结双极晶体管动态热电模型

Radioelektronika, Nanosistemy, Informacionnye Tehnologii Pub Date : 2023-06-29 DOI: 10.17725/rensit.2023.15.109

V. A. Sergeev, A. M. Hodakov

{"title":"Dynamic thermoelectric model of a heterojunction bipolar transistor taking into account the voltage drop on the emitter metallization tracks","authors":"V. A. Sergeev, A. M. Hodakov","doi":"10.17725/rensit.2023.15.109","DOIUrl":"https://doi.org/10.17725/rensit.2023.15.109","url":null,"abstract":"A dynamic 3D thermoelectric model has been developed to calculate the temperature field and emitter current density in the comb structure of a heterojunction bipolar transistor (HBT) with the length of the emitter metallization paths comparable to the size of the crystal, taking into account the inhomogeneous distribution of current density under the emitter paths caused by a voltage drop on the resistance of the current-carrying metallization. The model is based on an iterative solution in the COMSOL Multiphysics software environment of a non-stationary heat equation together with a system of equations for the distribution of electric potential along the emitter path and the current density under the path. It is shown that during the action of the heating power pulse in the HBT, the distribution of temperature and current density along the emitter tracks change character, respectively, from homogeneous and monotonically decreasing to non-monotonically changing. At the same time, the maximum temperature and current density reach stationary values with a rate significantly exceeding the rate of overheating increase with homogeneous heating of the structure, and the maxima of temperature and current density in the process of self-heating shift from the beginning to the center of the tracks. The proposed model can be used to evaluate the thermomechanical stresses in the structure of the HBT and the limiting electrical parameters in the pulsed modes of operation of the HBT.","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"79 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83353637","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}

引用次数: 0

The problems of scaling components in streaming data processing systems 流数据处理系统中组件的伸缩问题

Radioelektronika, Nanosistemy, Informacionnye Tehnologii Pub Date : 2023-06-29 DOI: 10.17725/rensit.2023.15.179

G. Bulychev, Alexey V. Chernykh

引用次数: 0

In Memory of Rostislav V. Belyaev 纪念罗斯提斯拉夫·v·别利亚耶夫

Radioelektronika, Nanosistemy, Informacionnye Tehnologii Pub Date : 2023-06-29 DOI: 10.17725/rensit.2023.15.199

V. I. Grachev

引用次数: 0

Calculation of the movement of rolling stock along the railway track by the grid-characteristic method 用网格特征法计算轨道车辆沿轨道的运动

Radioelektronika, Nanosistemy, Informacionnye Tehnologii Pub Date : 2023-06-29 DOI: 10.17725/rensit.2023.15.193

A. Kozhemyachenko

引用次数: 0

Radiometric method for soil moisture portraits obtaining to study the hydrology of dams 大坝水文研究中土壤水分图像的辐射测量方法

Radioelektronika, Nanosistemy, Informacionnye Tehnologii Pub Date : 2023-06-29 DOI: 10.17725/rensit.2023.15.125

I. Sidorov, A. Gudkov, E. P. Novichikhin, S. Chizhikov, I. Porokhov

引用次数: 0

Implementation of an Algorithm for Extracting Information about Structural Elements of Text Documents in ODT Format ODT格式文本文档结构元素信息提取算法的实现

Radioelektronika, Nanosistemy, Informacionnye Tehnologii Pub Date : 2023-06-16 DOI: 10.17587/it.29.307-315

A. Berezhkov, G. S. Larionova, V. Martsinkevich, V. Tereshchenko

{"title":"Implementation of an Algorithm for Extracting Information about Structural Elements of Text Documents in ODT Format","authors":"A. Berezhkov, G. S. Larionova, V. Martsinkevich, V. Tereshchenko","doi":"10.17587/it.29.307-315","DOIUrl":"https://doi.org/10.17587/it.29.307-315","url":null,"abstract":"The dependence of the XML markup of a digital document in the ODT format on the tool that was used to create it is considered. Not only specialized tools are used in comparison, but also those that do not directly work with the ODT format to identify the most vulnerable spots. The features of extracting data from the structural elements of the document, such as tables, lists and images, are also described. The implementation of an algorithm for obtaining style attributes used to create a system for automated normative control of digital documents is proposed and described. It is revealed that the non-strict standard of the ODT format led to the dependence of XML markup on the text editor that was used to create the document. And, as a result, to a limited number of tags that can be relied upon when developing document parsing algorithms. However, the task is feasible, as demonstrated in the article. Likewise, the default values, the description of the algorithm for bypassing the document in blocks and structural elements form the basis for preparing data for the subsequent creation of a classifier and automation of the process of normative control. Thus, the algorithm proposed in the article and the analysis of XML markup performed are effective tools for solving the problem of creating an automated document standard control system, and the algorithm has the potential for further improvement.","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81860309","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}

引用次数: 0

Improving the Quality of Estimates of the Parametric Identification Problem Using the Conservative Condition in Models of Distributed Dynamic Processes 利用分布动态过程模型中的保守条件提高参数辨识问题的估计质量

Radioelektronika, Nanosistemy, Informacionnye Tehnologii Pub Date : 2023-06-16 DOI: 10.17587/it.29.279-283

M. Matveev, Ekaterina A. Sirota

{"title":"Improving the Quality of Estimates of the Parametric Identification Problem Using the Conservative Condition in Models of Distributed Dynamic Processes","authors":"M. Matveev, Ekaterina A. Sirota","doi":"10.17587/it.29.279-283","DOIUrl":"https://doi.org/10.17587/it.29.279-283","url":null,"abstract":"Today the apparatus for modelling non-stationary time series is most in demand in various areas of human activity: meteorology, sociology, medicine, financial market research, and a number of others. The general scientific problem of modelling such series is associated with solving the problem of identification, namely, obtaining such model parameters that would provide a high degree of accuracy and adequacy of the model. However, the problem of bias of least square method (LSM) estimates arises when solving the problem of parametric identification of distributed dynamic processes. There are various possible solutions to this problem. If the time series is trend-stationary, then these may be \"ostationation\" methods, which are generally difficult to apply. It is possible to use dimensionality reduction methods, but in this case we will still get biased estimates. In our previous works, it was shown that the problem of biased estimates can be solved using the conservativeness condition. The aim of this work was to investigate the possibility of using the conservativeness condition to improve the quality of estimates of the parametric identification problem, as well as to compare these results with the solution of the problem, in the case of applying a filter to it, as well as ridge regression.","PeriodicalId":37476,"journal":{"name":"Radioelektronika, Nanosistemy, Informacionnye Tehnologii","volume":"118 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88106495","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}

引用次数: 0

Features of Analytical Modeling of QS with Hypererlang and Erlang Distributions 利用hyperlang和Erlang分布对QS进行解析建模的特点

Radioelektronika, Nanosistemy, Informacionnye Tehnologii Pub Date : 2023-06-16 DOI: 10.17587/it.29.284-289

V. Tarasov

引用次数: 0