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Tytuł:
Application of reanalysis methods in structural mechanics
Autorzy:
Delyová, I.
Frankovský, P.
Bocko, J.
Sivák, P.
Kurimský, R.
Powiązania:
https://bibliotekanauki.pl/articles/2174172.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
analiza strukturalna
równanie algebraiczne
wydajność obliczeniowa
structural reanalysis
algebraic equations
computational efficiency
change in the design variables
Opis:
When designing structures, it is often necessary to re-analyse a structure that is different in some parts from the original one. As real structures are often complex, their analysis is therefore very challenging. In such cases, reanalysis methods are advantageously used. The aim of this paper is to approach the problem of solving the constructions using reanalysis method in which the time taken in solving algebraic equations is reduced. In particular, the purpose of this work is to demonstrate on a chosen system the time savings and the advantages of the chosen direct efficient reanalysis method for a given design problem. A basic condition for meeting these criteria is the modernization of computational procedures in the mechanics of compliant solids.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 3; 49--62
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence of a Dielectric Relaxation in Weakly Polar Ferrofluids
Autorzy:
Rajňák, M.
Kurimský, J.
Dolník, B.
Cimbala, R.
Paulovičová, K.
Kopčanský, P.
Timko, M.
Powiązania:
https://bibliotekanauki.pl/articles/1032784.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
47.65.Cb
77.22.Ch
77.22.Gm
82.70.Dd
Opis:
In this paper, we report on the temperature dependent broadband dielectric response of a ferrofluid based on transformer oil and magnetite nanoparticles covered with oleic acid molecules. For that purpose the method of dielectric spectroscopy has been chosen in the frequency range from 20 Hz up to 100 kHz. The experiments were carried out on thin film ferrofluid samples confined in a glass plate capacitor containing indium tin oxide (ITO) plate electrodes. The obtained complex permittivity spectrum shows a pronounced dielectric dispersion in the low frequency range. Taking into account the ferrofluid composition we associate this relaxation with ion impurity polarization at the nanoparticle-oil interface. The strong temperature dependence of the relaxation process has been found when conducting the experiments in the temperature range from 298 K to 358 K. The relaxation time of the revealed process exhibits a typical Arrhenius behavior. Based on the conducted experiments and analysis, we propose some reasonable practical applications of the studied ferrofluid in the field of electrical engineering.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 943-945
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environmental Pollution Monitoring on High-Voltage Insulators
Monitorowanie zanieczyszczenia środowiska na izolatorach wysokiego napięcia
Autorzy:
Briancin, J.
Dolnik, B.
Fabian, M.
Kolcunova, I.
Kurimsky, J.
Dzmura, J.
Cimbala, R.
Powiązania:
https://bibliotekanauki.pl/articles/319135.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
izolatory wysokonapięciowe
zanieczyszczenie środowiska
prąd upływowy
przewodnictwo elektryczne
monitorowanie in-situ
high-voltage insulators
environmental pollution
leakage current
electrical conductivity
in-situ monitoring
Opis:
This work is focused on environmental pollution monitoring on selected high-voltage insulators. It is well known that environmental pollution on electrical insulation is one of the problems faced by distribution utilities and electricity transmission system. Due to this reason there is a need to deal with monitoring of environmental pollution as it strongly influences their capability to withstand the high-voltage stress without the breakdown. It is the aim of present work to explain influence of morphology and chemical composition of pollutants on the surface resistance and conductivity of selected insulators.
W artykule przedstawiono wyniki prac dotyczących monitorowania zanieczyszczenia środowiska na wybranych izolatorach wysokonapięciowych. Powszechnie wiadomo, że zanieczyszczenie środowiska oddziałujące na izolację elektryczną jest jednym z problemów, z którymi borykają się przedsiębiorstwa dystrybucyjne i system przesyłu energii elektrycznej. Z tego powodu istnieje potrzeba monitorowania zanieczyszczenia środowiska które silnie wpływa na ich zdolność instalacji do pracy bez awarii. Celem niniejszego artykułu jest wyjaśnienie wpływu morfologii i składu chemicznego zanieczyszczeń na oporność powierzchni i przewodnictwo wybranych izolatorów.
Źródło:
Inżynieria Mineralna; 2018, R. 19, nr 1, 1; 111-114
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Electric Field on AC Magnetic Susceptibility of a Mineral Oil Based Ferrofluid
Autorzy:
Rajňák, M.
Dolník, B.
Tobiáš, T.
Paulovičová, K.
Kurimský, J.
Cimbala, R.
Kopčanský, P.
Timko, M.
Powiązania:
https://bibliotekanauki.pl/articles/1030753.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
47.65.Cb
75.30.Cr
47.65.-d
Opis:
In a ferrofluid, the magnetic susceptibility at low magnetic fields is sensitive to the size and shape of magnetic nanoparticles and their concentration in a liquid carrier. In this paper we report on the AC magnetic susceptibility of a ferrofluid based on a mineral oil and iron oxide nanoparticles coated with oleic acid. As this type of ferrofluid is of increasing interest for electrical engineering applications, we investigate the effect of an external electric field and an electric current flowing through the ferrofluid on the AC magnetic susceptibility at ambient conditions. It is known that the action of the electric field on the oil based ferrofluids can result in the particle assembling. Then, the induced structural changes may affect the magnetic susceptibility of the bulk ferrofluid. In our experimental study we observed that the ferrofluid magnetic susceptibility decreases with increasing electric field. However, a heating effect with increasing electric field was observed too. Hence, it is concluded that besides the structural changes, the Joule heating has an obvious impact on the magnetic susceptibility of the ferrofluid in the external electric field.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 567-579
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Thermal Field in Mineral Transformer Oil Based Magnetic Fluids
Autorzy:
Kosterec, M.
Kurimský, J.
Cimbala, R.
Čonka, Z.
Kruželák, L.
Rajňák, M.
Timko, M.
Kopčanský, P.
Vargová, B.
Powiązania:
https://bibliotekanauki.pl/articles/1032149.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
44.25.+f
44.27.+g
47.11.Fg
47.65.Cb
Opis:
Growing interest in the use of magnetic fluids in power systems especially in transformers as insulation and a coolant is nowadays registered. Magnetisable nanofluids, which are used in cooling systems as an alternative to mineral transformer oil, are characterized by lower concentration of magnetic nanoparticles. The magnetic fluid has better heat transfer and dielectric properties such as breakdown than mineral transformer oil and it can be used to improve heat flow, thereby increasing the ability of the active parts to resist failures such as electromagnetic pulses. External magnetic field may be used for forced circulation of magnetic fluid. Magnetic force inside the magnetic fluid can be adequately controlled by adjusting the incident magnetic field. This paper presents thermal distribution, fluid flow and cooling ability of mineral transformer oil and magnetic fluid based on mineral transformer oil. The concentration of Fe₃O₄ magnetic nanoparticles is 0.15% volume of mineral transformer oil. The thermal field is generated by a steel conductor. Thermal distributions in mineral transformer oil and magnetic fluid are investigated and differences for both cases are discussed in the paper.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 937-939
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generation of Fe₃O₄ Nanoparticle Aggregates in a Ferrofluid Driven by External Electric Field
Autorzy:
Kurimský, J.
Rajňák, M.
Cimbala, R.
Paulovičová, K.
Timko, M.
Kopčanský, P.
Kolcun, M.
Kosterec, M.
Kruželák, L.
Powiązania:
https://bibliotekanauki.pl/articles/1032151.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
47.57.J-
47.65.Cb
77.22.Jp
77.22.Ch
82.70.Dd
Opis:
In the paper the experimental study of magnetic nanoparticle aggregation in a transformer oil based ferrofluid driven by an external electric field is reported. The studied ferrofluid was composed of the magnetite nanoparticles, oleic acid surfactant, and transformer oil. Generally, it is considered that superparamagnetic nanoparticles do not interact in the absence of external magnetic field. In the paper we present an experimental observation of the particle assembly formation in a direct current external electric field by optical microscopy. During the observation no external magnetic field was applied. A diluted low-polarity ferrofluid drop on a glass surface was exposed to the external static inhomogeneous electric field. It is assumed that induced dipole-dipole interaction and subsequent dielectrophoretic motion give rise to the electrohydrodynamic flow in the fluid after a certain time period. As a result, a visible particle chain was formed at the drop electrical equator. This demonstration is expected to contribute to the understanding of the streamer formation and electrical breakdown in transformer oil based ferrofluids.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 907-909
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
AC Magnetic Susceptibility of Ferrofluids Exposed to an External Electric Field
Autorzy:
Rajňák, M.
Dolník, B.
Kováč, J.
Paulovičová, K.
Mitróová, Z.
Kurimský, J.
Cimbala, R.
Kopčanský, P.
Timko, M.
Powiązania:
https://bibliotekanauki.pl/articles/1032260.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
47.65.Cb
75.75.Fk
75.78.-n
83.60.Np
Opis:
It is known that ferrofluid superparamagnetic nanoparticles response to external magnetic fields, often resulting in the formation of elongated clusters along the field. This has a notable impact on dielectric properties of ferrofluids. Here we report on indications of a contrary effect when the magnetic susceptibility of ferrofluids based on transformer oil is influenced by an external electric field. This effect is associated with structural changes in the ferrofluids induced by the external electric fields. Particularly, we focus on a steady state electric field effect, which gives rise to forces acting on the magnetite nanoparticles, leading to the formation of aggregates. In this condition we have measured the ferrofluid AC magnetic susceptibility in parallel and perpendicular configuration of magnetic and electric fields at room temperature. The measurements in both configurations yielded a noticeable decrease in the real susceptibility values with increasing electric field intensity. The result is believed to be caused by the reduction in the total magnetic moment of the ferrofluid. This can be a consequence of the superspin interactions in the aggregates, minimizing the aggregate's energy. Finally, we highlight the necessity of NMR and small angle scattering of polarized neutrons investigations in order to obtain exact information on the magnetic structure induced by the electric forces.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 887-889
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variation of magnetic fluid deformation related to nanoparticle concentration in steady electric field
Autorzy:
Kosterec, M.
Kurimský, J.
Cimbala, R.
Špes, M.
Farkaš, R.
Dolník, B.
Gamcová, M.
Rajňák, M.
Timko, M.
Kopčanský, P.
Paulovičová, K.
Vargová, B.
Powiązania:
https://bibliotekanauki.pl/articles/1048186.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
47.65.Cb
41.20.-q
47.55.D-
Opis:
Today, it is important to know the behaviour of magnetic fluids applied in the power electrical machines, e.g. in power transformers, when exposed to an electric field. Besides their promising applications in high voltage engineering, they are of increasing interest from designed assembly and pattern formation point of view. The structure of such magnetic fluids is easily controllable by external magnetic fields. However, less attention has been paid to structural phenomena in magnetic fluids induced by electric fields. The core of this paper is dedicated to the experimental observation of a magnetic fluid droplet deformation in a steady electric field. The mutual relation between the deformation parameter and magnetic nanoparticles concentration is analysed. Spatio-temporal analysis of the droplet shape is presented in the paper. The phenomena of the droplet deformation were recorded by a camera. The detailed experimental procedure is presented. The method of deformation parameter calculation based on the linear pixel as the smallest-size unit in digital image is written. Finally, the relation between the deformation parameter and the nanoparticle volume concentration, as well as the time and magnitude of the DC field application are thoroughly evaluated. The results show that the deformation parameter decreases with increasing concentration at constant applied steady electric field but increases with increasing applied steady electric field.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 570-573
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Shielding Effectiveness of a Magnetic Fluid in Radio Frequency Range
Autorzy:
Dolník, B.
Rajňák, M.
Cimbala, R.
Kolcunová, I.
Kurimský, J.
Džmura, J.
Petráš, J.
Zbojovský, J.
Kosterec, M.
Kopčanský, P.
Timko, M.
Powiązania:
https://bibliotekanauki.pl/articles/1030481.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
41.20.Jb
41.20.Gz
75.50.Mm
81.70.Ex
07.50.Hp
Opis:
This article builds on the previous work and describes the interaction of transformer oil-based magnetic fluid (MF) with the radio frequency (RF) magnetic near-field. Three prepared samples of the MF used as a barrier to magnetic near-field, consist of transformer oil and dispersed magnetite nanoparticles coated with oleic acid. We pay attention to the important area related to the electromagnetic field shielding by the MF. Such sample of the MF may be a good candidate for applications where it is necessary to simultaneously electrically isolate, remove the excess of heat and to shield electromagnetic interference (EMI). We present a method for the determination of shielding effectiveness (SE) of the MF under RF excitation conditions ranging from 500 MHz to 3 GHz. We report the effect of magnetic volume fraction in the MF and the effect of the sample thickness on the SE.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 585-587
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Morphometric analysis – effect of the radiofrequency interface of electromagnetic field on the size of hatched Dermacentor reticulatus larvae
Autorzy:
Vargová, B.
Majláth, I.
Kurimský, J.
Cimbala, R.
Pipová, N.
Živčák, J.
Tryjanowski, P.
Peťko, B.
Džmura, J.
Ižariková, G.
Majláthová, V.
Powiązania:
https://bibliotekanauki.pl/articles/28762746.pdf
Data publikacji:
2021
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2021, 28, 3; 419-425
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 12

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