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2022 ELEKTRO (ELEKTRO)最新文献

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Home experiment as one of the possibilities of laboratory exercises during online education 在网络教学中,家庭实验作为实验练习的一种可能性
Pub Date : 2022-05-23 DOI: 10.1109/ELEKTRO53996.2022.9803385
G. Tarjányiová, T. Mizera
During studies at technical universities, a practical understanding of the topic explained plays a major role. The area of fundamental physics is no exception. For this reason, well-designed laboratory exercises have an important role for students. In this paper, we describe the preparation of new complex laboratory exercises of mechanics aimed at their implementation during online education. We describe a new home experiment that students can perform at home and at the same time understand the physical signification of the events that take place in such experiments.
在技术大学学习期间,对所解释的主题的实际理解起着重要作用。基础物理领域也不例外。因此,精心设计的实验练习对学生来说非常重要。在本文中,我们描述了准备新的复杂的实验练习力学旨在其实施在网络教育。我们描述了一个新的家庭实验,学生可以在家里进行,同时了解在这样的实验中发生的事件的物理意义。
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引用次数: 0
Analysis of SAW interaction with liquid nanocomposites SAW与液体纳米复合材料相互作用分析
Pub Date : 2022-05-23 DOI: 10.1109/ELEKTRO53996.2022.9803801
Marek Veveričík, P. Bury, F. Černobila
The usage of surface acoustic waves (SAWs) is analyzed based on previous research in the investigation of behavior of liquid nanocomposites, such as doped liquid crystals and oil-based magnetic fluids namely under applied external magnetic field. The SAW propagation along the interface between fluid and substrate creates longitudinal wave the attenuation response of which can be measured and appears as a highly effective way to study processes induced by the external magnetic field. This is an advantage especially in the cases where the utilization of the longitudinal acoustic waves due to the higher viscosity of the investigated environment are not available. The interactions between the magnetic field and magnetic moments of nanoparticles in magnetic fluids give a rise to the aggregation of magnetic nanoparticles into chain or cluster formations that have a marked influence on the SAW attenuation. The measurement of the acoustic anisotropy is giving additional information about the structure of nanoparticles formation origination under an applied external field. In the case of liquid crystals doped with magnetic nanoparticles, the both threshold field and nematic-isotropic transition shift caused by the doping process with magnetic nanoparticles can be registered by SAW. The reason is in an orientational coupling between dipole moments of LC molecules and nanoparticles. The effect of particle concentration on the magnitude of structural changes invoked by the external field plays also an important role.
在研究掺杂液晶和油基磁性流体等液体纳米复合材料在外加磁场作用下的行为的基础上,分析了表面声波(saw)的应用。声表面波沿流体和衬底界面传播产生纵波,纵波的衰减响应可以测量,是研究外磁场诱导过程的一种非常有效的方法。这是一个优势,特别是在由于研究环境的高粘度而无法利用纵向声波的情况下。磁场与磁性流体中纳米颗粒的磁矩之间的相互作用导致磁性纳米颗粒聚集成链状或团簇状,这对声呐衰减有显著影响。声波各向异性的测量提供了在外加磁场作用下纳米颗粒形成起源结构的附加信息。在掺杂磁性纳米颗粒的液晶中,声呐波可以记录到阈值场和磁性纳米颗粒掺杂过程引起的向列向各向同性跃迁。其原因在于LC分子与纳米粒子偶极矩之间的取向耦合。粒子浓度对外场引起的结构变化幅度的影响也起着重要作用。
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引用次数: 0
Application of Sweep Frequency Eddy Current Testing to Material Defect Evaluation 扫描频率涡流检测在材料缺陷评定中的应用
Pub Date : 2022-05-23 DOI: 10.1109/ELEKTRO53996.2022.9803473
Filip Vaverka, M. Smetana, D. Gombarska, L. Janoušek
The application of sweep frequency eddy current testing to defect detection and evaluation is discussed in this work. We focus mainly on the examination of the possibility of defect parameters evaluation using data that are acquired at the surrounding of the defect. The measurements performed in the vicinity of the artificial defect are examined. Experiments had been performed on a stainless-steel plate with artificial defects using a ferrite core probe. Presented results show the influence of present defect in the material mainly on the real part of the sensed signal. The position of the probe relative to the defect is also reflected in the value of the real component of the response signal. The present findings might help to solve the defect parameters evaluation problem.
本文讨论了扫描频率涡流检测在缺陷检测和评定中的应用。我们主要集中在检查缺陷参数评估的可能性,使用在缺陷周围获得的数据。在人工缺陷附近进行的测量进行了检查。利用铁氧体铁芯探针在带有人工缺陷的不锈钢板上进行了实验。结果表明,材料中存在的缺陷主要对被测信号的实部产生影响。探头相对于缺陷的位置也反映在响应信号的实分量的值中。本研究结果可能有助于解决缺陷参数的评估问题。
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引用次数: 0
Implementation of New Fault Tolerant Control for Five-Phase Induction Motor in Fault Operation 五相异步电动机故障运行新型容错控制的实现
Pub Date : 2022-05-23 DOI: 10.1109/ELEKTRO53996.2022.9803812
Jakub Kellner, S. Kaščák, M. Praženica, P. Resutík, Ž. Ferková
Multiphase electric motors, in conjunction with power semiconductor converters, are the electric drives of the future. This is due to their superior characteristics over three-phase motors. Multiphase motors have a higher fault tolerance, which is one of its benefits. When employing multi-phase motors in EV and HEV, how they perform in a failure condition is critical. And it is on this foundation that the study presented in this paper is based. The article looks at how to regulate a five-phase motor in a fault condition in order to improve the drive's qualities during fault operation. The entire mathematical expressions of the five-phase induction motor model in normal and fault operation are supplied, as well as the control adjustment to improve the drive's attributes. Following that, the five-phase field-oriented control is discussed, which improves the drive's characteristics in four-phase operation.
多相电动机,结合功率半导体转换器,是未来的电力驱动。这是由于它们优于三相电动机的特性。多相电动机具有较高的容错能力,这是其优点之一。在电动汽车和混合动力汽车中使用多相电动机时,其在故障条件下的性能是至关重要的。本文的研究正是建立在这个基础上。本文探讨了五相电动机在故障状态下如何进行调节,以提高其故障运行时的传动质量。给出了五相异步电动机模型在正常和故障运行时的完整数学表达式,以及控制调整以提高驱动器的性能。然后,讨论了五相磁场定向控制,改善了驱动器在四相运行时的特性。
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引用次数: 0
Study of the Possibility of IoT Use in a Microgrid on the Basis of Renewable Energy Sources 基于可再生能源的微电网物联网应用可能性研究
Pub Date : 2022-05-23 DOI: 10.1109/ELEKTRO53996.2022.9803592
S. Karabanov, P. Bezrukikh, S. S. Belykh, D. Suvorov, Oleg V. Loban, E. Slivkin
To provide the stable operation of a microgrid, it is important to ensure the on-line control of microgrid parameters. The paper presents the research results of the possibility of IoT application for the microgrid operation control. The main lines of research are: the analysis and selection of microgrid control systems; the selection of monitored parameters of microgrid elements, sensor network for the microgrid parameters control; approaches for the use of IoT in the microgrid control system; the use of IoT for the collection and transfer of information, network characteristics, recommendations for choosing the information volume for the transfer. The results of the work are: monitored parameters of microgrid combined with IoT are chosen; hardware methods of microgrid monitoring on the basis of IoT technology are suggested.
为了保证微电网的稳定运行,保证微电网参数的在线控制是非常重要的。介绍了物联网应用于微电网运行控制的可能性的研究成果。研究的主要内容是:微电网控制系统的分析与选择;选取微网要素监测参数,对传感器网络进行微网参数控制;在微电网控制系统中使用物联网的方法;利用物联网进行信息的收集和传输,网络特点,建议选择用于传输的信息量。工作的结果是:选择了微网与物联网结合的监测参数;提出了基于物联网技术的微电网监控硬件方法。
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引用次数: 2
Simulation of different antennae arrangement for study of high frequency electromagnetic field influence to tumor tissue 不同天线布置方式对高频电磁场对肿瘤组织影响的模拟研究
Pub Date : 2022-05-23 DOI: 10.1109/ELEKTRO53996.2022.9803594
Z. Psenakova, D. Gombarska, Frederika Bačová, Lucia Čarnecká
This article focuses on the modelling and simulation of high-frequency electromagnetic field thermal effects on tumour tissue. It studies how a commonly used EMF frequency in hyperthermia influences the distribution of specific absorption rate (SAR) in a heterogeneous woman's breast model. We built a simulation model with two radiating antenna topologies, and we changed the location of the tumour in the breast to three different locations. The simulation results were compared and evaluated.
本文主要对高频电磁场对肿瘤组织的热效应进行建模和仿真。它研究了热疗中常用的EMF频率如何影响异质女性乳房模型中特定吸收率(SAR)的分布。我们建立了一个具有两种辐射天线拓扑结构的模拟模型,并将乳房中肿瘤的位置改变为三个不同的位置。对仿真结果进行了比较和评价。
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引用次数: 0
Usage of clouds in the education process 云在教育过程中的使用
Pub Date : 2022-05-23 DOI: 10.1109/elektro53996.2022.9803575
M. Moravčík, I. Bridova, P. Segec
In the paper we deal with the issue of using cloud in academic environment, specifically in process of education at Department of information networks, University of Zilina (KIS UNIZA). The paper presents two views on the use of the cloud in the educational process. The first is the user’s view, when the services offered by the cloud are used, and the second is from the administrator’s point of view in our private cloud. Then we present how we applied these two views in the educational process at our department.
本文探讨了云在学术环境中的应用问题,特别是在日利纳大学信息网络系的教学过程中。本文就云在教育过程中的应用提出了两种观点。第一个是从用户的角度来看,当使用云提供的服务时,第二个是从我们私有云中的管理员的角度来看。然后,我们将介绍我们如何将这两种观点应用到我们系的教育过程中。
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引用次数: 1
Proliferative Activity of Eukaryotic Cells Affected by Extremely Low-Frequency Electromagnetic Field 极低频电磁场对真核细胞增殖活性的影响
Pub Date : 2022-05-23 DOI: 10.1109/ELEKTRO53996.2022.9803049
Lucia Čarnecká, Marek Bajtoš, Zuzana Judáková, R. Radil, L. Janoušek
This study aims to investigate the effect of grid frequency on changes in the proliferative activity of eukaryotic Saccharomyces cerevisiae cells in vitro. As the extremely low-frequency electromagnetic field affects humanity, it is essential to examine its influence on living organisms. This particular area remains unclear, especially in long-term radiation. The grid frequency and magnetic flux density of the Earth's magnetic field were applied. This paper presents the irradiation including field parameters in the ratio of time-varying and static magnetic field at a certain level BAC / BDC = 1.8. In the light of recent results, there is now some concern about the compliance of grid frequency with conditions of ion parametric resonance. Using V. V. Lednev’s formula, 50 Hz frequency is close to the cyclotron motion of Mg2+ in the eucaryotic cell. Hence, the maximum stimulation effect of the field was achieved at the coil position E, with the number of cells in the exposed sample being 129 % more than in the control sample. On the other hand, the maximum inhibition was detected in the coil sample D with a yeast growth coefficient of -67 %. Presented data may have important implications for the long-term exposure of ELF-EMF which may shed some light on the issue.
本研究旨在探讨栅格频率对真核酿酒酵母细胞体外增殖活性变化的影响。由于极低频电磁场对人类的影响,研究其对生物的影响是必要的。这个特定的区域仍然不清楚,特别是在长期辐射中。采用地球磁场的栅格频率和磁通密度。本文给出了在一定水平下,含时变磁场与静磁场之比的场参数辐照BAC / BDC = 1.8。根据最近的结果,现在有一些关注网格频率与离子参数共振条件的遵从性。利用V. V. Lednev公式,50 Hz的频率接近真核细胞中Mg2+的回旋运动。因此,在线圈位置E处,电场的刺激效果最大,暴露样品中的细胞数量比对照样品多129%。另一方面,在线圈样品D中检测到最大的抑制作用,酵母生长系数为- 67%。所提供的数据可能对长期接触极低频电磁场有重要影响,这可能对这个问题有所启发。
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引用次数: 2
Influence of high voltage power lines on the propagation of stray currents from DC traction 高压输电线路对直流牵引杂散电流传播的影响
Pub Date : 2022-05-23 DOI: 10.1109/ELEKTRO53996.2022.9803410
M. Hoger, M. Regula, P. Braciník, A. Otcenásová
A typical problem related to the operation of DC railway traction systems are stray currents. Spreading through the ground in the vicinity of the railroad tracks, DC stray currents pose due to the electro-chemical corrosion effects a serious threat to all metallic structures in the ground that form a parallel path for the ground currents. However, the presence of stray currents is not strictly limited only to the direct vicinity of railways. Due to the presence of conductive elements like gas pipes, water pipes, grounding systems of electrical networks etc., stray currents can spread also to more distant areas, where the presence of stray currents is not expected. One of the possible elements contributing to the spreading of stray currents are also high voltage overhead power lines. This paper presents a possible technique for analyzing the influence of overhead powerlines on the spreading of stray currents in a given area.
与直流铁路牵引系统运行有关的一个典型问题是杂散电流。直流杂散电流在铁路轨道附近的地面上传播,由于其电化学腐蚀效应,对地面上为接地电流形成平行通路的所有金属结构构成严重威胁。然而,杂散电流的存在并不严格限于铁路的直接邻近地区。由于存在导电元件,如燃气管道、水管、电网接地系统等,杂散电流也可以传播到更遥远的区域,而杂散电流的存在是意料之外的。造成杂散电流扩散的一个可能因素也是高压架空电力线。本文提出了一种分析给定区域内架空电力线对杂散电流扩散影响的可行方法。
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引用次数: 0
Evaluation of the loss model accuracy of 3-phase NPC converter 三相NPC变换器损耗模型精度评价
Pub Date : 2022-05-23 DOI: 10.1109/ELEKTRO53996.2022.9803481
M. Frivaldský, J. Šedo, P. Resutík, B. Hanko
The paper deals with the evaluation of the power loss generation of the 3-phase NPC converter. The efficiency performance of any power semiconductor system is currently main qualitative indicator due to several reasons. Therefore, the evaluation of the power losses is one of the initial stages of design of power converter to properly estimate requirements on thermal performance as well, thus optimized cooling system can be realized. Because currently there are various procedure how to estimate power dissipation, the focus here is given on the comparison of the results received from piece-wised linear simulator and from mathematical calculations recommended for analyzed converter topology. The main aim of this study is to evaluate the accuracy of piece-wised linearized simulators, whether simplification of the simulation analysis potentially reduces usability of the information relevant for efficiency estimation. From received analysis is seen, that accuracy of the simulation model presented here, provides sufficiently accurate results for further design issues.
本文对三相NPC变换器的功率损耗进行了评估。由于种种原因,目前任何功率半导体系统的效率性能都是主要的定性指标。因此,功率损耗的评估是功率变换器设计的初始阶段之一,以正确估计对热性能的要求,从而实现冷却系统的优化。由于目前有各种各样的方法来估计功耗,因此本文的重点是将分段线性模拟器得到的结果与分析转换器拓扑时推荐的数学计算结果进行比较。本研究的主要目的是评估分段线性化模拟器的准确性,模拟分析的简化是否会降低与效率估计相关的信息的可用性。从收到的分析可以看出,本文所提出的仿真模型的准确性,为进一步的设计问题提供了足够准确的结果。
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引用次数: 2
期刊
2022 ELEKTRO (ELEKTRO)
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