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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
Q4 Materials Science Pub Date : 2023-06-29 DOI: 10.17725/rensit.2023.15.185
I. Mitskovets
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.
采用嵌合网格法模拟了弹性扰动在含孔隙和裂隙包裹体介质中的传播。考虑了一种描述地质岩石状态的线弹性各向同性介质模型。采用三阶精确鲁萨诺夫格式的网格特征法对弹性扰动的动态传播进行了数值模拟。特别要注意的是孔隙或裂缝的单独包裹体的存在,它们将非均质性引入介质,并可以实质上影响弹性扰动的响应。嵌合体网格方法的使用允许明确地描述这种内含物的位置和形状,同时考虑到它们对弹性扰动传播的影响。研究的结果是,开发了一种弹性扰动在含孔隙和裂隙包裹体介质中传播的数值模拟方法,该方法可用于评估此类包裹体对弹性扰动动态响应的影响。所提出的结果可应用于地球物理和地震研究,以模拟土壤和岩石中各种过程的动力学。
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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
Q4 Materials Science Pub Date : 2023-06-29 DOI: 10.17725/rensit.2023.15.133
V. Ignatiev, N. Lebedev, S. Perchenko, D. Stankevich
A quantum model for the interaction of a collectivized conduction electron with a crystal field in a homogeneous and isotropic deformed polycrystalline sample, taking into account the spin-orbit interaction, is proposed. A dynamic equation of motion of the conduction electron spin in a stress-strained metal is obtained. It is shown that under conditions of inhomogeneous torsion in the stationary case, the average spin of conduction electrons is oriented predominantly along the current density vector. The maximum value of the spin-orbit interaction is observed when the torsion axis is orthogonal to the current density vector.
提出了考虑自旋轨道相互作用的均匀各向同性变形多晶样品中集体化传导电子与晶体场相互作用的量子模型。得到了应力应变金属中传导电子自旋的动力学方程。结果表明,在稳态情况下,在非均匀扭转条件下,导电电子的平均自旋主要沿电流密度矢量取向。当扭转轴与电流密度矢量正交时,观察到自旋轨道相互作用的最大值。
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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
Q4 Materials Science Pub Date : 2023-06-29 DOI: 10.17725/rensit.2023.15.109
V. A. Sergeev, A. M. Hodakov
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.
考虑到载流金属化电阻上的电压降导致发射极路径下电流密度分布不均匀的情况,建立了一个动态三维热电模型,计算了发射极金属化路径长度与晶体尺寸相当的异质结双极晶体管(HBT)梳状结构中的温度场和发射极电流密度。该模型是基于COMSOL Multiphysics软件环境下非平稳热方程的迭代解,以及沿发射极路径的电势分布和路径下电流密度的方程组。结果表明,在加热功率脉冲作用下,沿发射极轨迹的温度和电流密度分布分别从均匀单调减小到非单调变化。同时,随着结构的均匀加热,最高温度和电流密度达到平稳值的速度明显超过过热的增加速度,并且在自热过程中,温度和电流密度的最大值从轨道的开始向轨道的中心移动。该模型可用于计算高温超导超导体的热力学应力和高温超导体在脉冲工作模式下的极限电参数。
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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
Q4 Materials Science Pub Date : 2023-06-29 DOI: 10.17725/rensit.2023.15.179
G. Bulychev, Alexey V. Chernykh
The article examines the existing problems of scaling components in streaming data processing systems. The algorithm proposed by the authors significantly reduces the number of operations for creating and removing components when scaling the system. The algorithm is based on linear regression. For the proposed algorithm, the practical load on the system is simulated to confirm the theoretical results obtained.
本文研究了流数据处理系统中存在的可伸缩组件问题。作者提出的算法在扩展系统时显著减少了创建和删除组件的操作次数。该算法基于线性回归。针对所提出的算法,对系统实际负荷进行了仿真,验证了理论结果。
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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
Q4 Materials Science Pub Date : 2023-06-29 DOI: 10.17725/rensit.2023.15.199
V. I. Grachev
Information is presented about the deceased Rostislav Vladimirovich Belyaev, Ph.D., Senior Researcher in Laboratory of Physical Fundamentals of Nanocomposite Materials for Information Technology, Department of Physical Fundamentals of Nanoelectronics, Kotelnikov Institute of Radioengineering and Electronics of Russian Academy of Sciences, Corresponding Member of the Russian Academy of Natural Sciences, a well-known specialist in the field of generation of microwave noise oscillations and processing of broadband signals based on dynamic chaos: basic biographical data, education at the Moscow Institute of Physics and Technology with a degree in electronics, work at the Kotelnikov IRE (Moscow), Ph.D. (Physics and Mathematics) dissertation, authorship of more than 60 scientific papers in scientific journals, participation in Russian and international conferences and seminars, editorship in scientific journals.
介绍已故的rosstislav Vladimirovich Belyaev博士,俄罗斯科学院科捷尔尼科夫无线电工程与电子研究所纳米电子物理基础系信息技术纳米复合材料物理基础实验室高级研究员,俄罗斯自然科学院通讯院士。微波噪声振荡产生及基于动态混沌的宽带信号处理领域的知名专家;基本履历,在莫斯科物理与技术学院接受教育,获得电子学学位,在莫斯科科捷尔尼科夫研究所工作,博士学位(物理和数学),在科学期刊上发表了60多篇科学论文,参加了俄罗斯和国际会议和研讨会,在科学期刊上担任编辑。
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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
Q4 Materials Science Pub Date : 2023-06-29 DOI: 10.17725/rensit.2023.15.193
A. Kozhemyachenko
The application of a grid-characteristic method is proposed for numerical simulation of the movement of rolling stock along a railway track laid on an earth and a bridge. In the study, the railway track is presented using a dynamic system of equations of the theory of elasticity of hyperbolic type. The grid-characteristic method relies on the characteristic properties of the system under consideration and uses finite-difference schemes of high order of accuracy to obtain a space-time solution. The features of railway structures are considered by changing the boundary conditions and conditions at the contact borders. To simulate the areas of contact of wheel pairs of rolling stock with the rail – the "wheel-rail" system – a previously developed pressure boundary condition is applied, modified so as to consider multi-element rolling stock. As a result of computer simulation of the movement of rolling stock along the railway track of various types, full-wave stress distribution in the track structure is obtained, which makes it possible to predict dangerous sections of rolling stock movement.
提出了用网格特征法对铺在地面和桥梁上的铁路轨道进行数值模拟的方法。在研究中,用双曲型弹性理论的动力学方程组来表示铁路轨道。网格特征法依赖于所考虑的系统的特征特性,采用高阶精度的有限差分格式获得时空解。通过改变边界条件和接触边界条件来考虑铁路结构的特征。为了模拟机车车辆轮对与轨道的接触面积,即“轮轨”系统,采用了先前提出的压力边界条件,并对其进行了修改,以考虑多单元机车车辆。通过对不同类型铁路轨道上的车辆运动进行计算机模拟,得到了轨道结构中的全波应力分布,为预测车辆运动的危险路段提供了可能。
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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
Q4 Materials Science Pub Date : 2023-06-29 DOI: 10.17725/rensit.2023.15.125
I. Sidorov, A. Gudkov, E. P. Novichikhin, S. Chizhikov, I. Porokhov
The methods for the artificial hydraulic structures condition monitoring using trace microwave radiometers are considered, in order to timely detect places of underground leaks to ensure trouble-free operation. Several practical examples of the use of microwave radiometers on various ground-based mobile carriers are described. The characteristics of microwave radiometers used in practice for hydrological monitoring of earthen dams are given. The possibility of detecting potentially dangerous sections of dams, places of erosion of the dam cover, possible places of underground leaks is shown. The possibility of combining microwave radiometers with other means of remote sensing, such as optical video cameras, thermal infrared cameras and georadars, is being considered. The advantages of multisensory sensing to increase the reliability of detecting places of underground leaks are substantiated.
探讨了利用微量微波辐射计监测人工水工构筑物状态的方法,以便及时发现地下泄漏点,保证人工水工构筑物无故障运行。介绍了在各种地面移动载波上使用微波辐射计的几个实际例子。介绍了实际应用于土坝水文监测的微波辐射计的特点。显示了检测大坝潜在危险路段的可能性,大坝覆盖层侵蚀的地方,可能的地下泄漏的地方。目前正在考虑将微波辐射计与光学摄像机、热红外摄像机和地质雷达等其他遥感手段结合起来的可能性。论证了多感官传感技术在提高地下泄漏点探测可靠性方面的优势。
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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
Q4 Materials Science Pub Date : 2023-06-16 DOI: 10.17587/it.29.307-315
A. Berezhkov, G. S. Larionova, V. Martsinkevich, V. Tereshchenko
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.
考虑了ODT格式的数字文档的XML标记对用于创建该文档的工具的依赖性。在比较中不仅使用专门的工具,而且还使用那些不直接使用ODT格式的工具来识别最易受攻击的点。还描述了从文档的结构元素(如表、列表和图像)中提取数据的特性。提出并描述了一种获取用于创建数字文档自动规范控制系统的样式属性的算法的实现。结果表明,ODT格式的非严格标准导致XML标记依赖于用于创建文档的文本编辑器。因此,在开发文档解析算法时可以依赖的标记数量有限。然而,正如本文所演示的那样,该任务是可行的。同样,默认值、绕过块文档的算法描述和结构元素构成了为后续创建分类器和规范控制过程自动化准备数据的基础。因此,本文提出的算法和所执行的XML标记分析是解决创建自动化文档标准控制系统问题的有效工具,并且该算法具有进一步改进的潜力。
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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
Q4 Materials Science Pub Date : 2023-06-16 DOI: 10.17587/it.29.279-283
M. Matveev, Ekaterina A. Sirota
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.
今天,对非平稳时间序列建模的仪器在人类活动的各个领域最需要:气象学、社会学、医学、金融市场研究和许多其他领域。为这类序列建模的一般科学问题与解决识别问题有关,即获得能够提供模型高度准确性和充分性的模型参数。然而,在求解分布式动态过程的参数辨识问题时,会出现最小二乘法估计的偏差问题。这个问题有多种可能的解决方案。如果时间序列是趋势平稳的,那么这些可能是“平稳化”方法,通常难以应用。可以使用降维方法,但在这种情况下,我们仍然会得到有偏差的估计。在我们之前的工作中,已经证明了使用保守性条件可以解决有偏估计的问题。这项工作的目的是研究使用保守性条件来提高参数识别问题估计质量的可能性,并将这些结果与问题的解决方案进行比较,在对其应用过滤器的情况下,以及岭回归。
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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
Q4 Materials Science Pub Date : 2023-06-16 DOI: 10.17587/it.29.284-289
V. Tarasov
The article is devoted to the construction of a mathematical model for delaying claims in a queue in the form of a queuing system (QS) described by right-shifted hyper-Erlang and second-order Erlang distributions. This article is a logical continuation of the previous works of the author. In the article, the Erlang distribution is considered as a special case of the more general Gamma distribution law, in contrast to the normalized Erlang distribution. These two forms of the Erlang distribution differ in numerical characteristics, except for the coefficient of variation. To solve the problem, we used the method of spectral solution of the Lindley integral equation.
本文研究了用右移超Erlang和二阶Erlang分布描述的排队系统(QS)形式的排队延迟索赔的数学模型的构建。这篇文章是作者以前作品的合乎逻辑的延续。在本文中,与标准化的Erlang分布相比,Erlang分布被认为是更一般的Gamma分布定律的一种特殊情况。除了变异系数不同外,这两种形式的二郎分布在数值特征上有所不同。为了解决这个问题,我们采用了林德利积分方程的谱解法。
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引用次数: 0
期刊
Radioelektronika, Nanosistemy, Informacionnye Tehnologii
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