Temat: magnetic effect - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Determination of mechanical properties of P91 steel by means of magnetic Barkhausen emission
Autorzy:: Makowska, K.
Kowalewski, Z. L.
Augustyniak, B.
Piotrowski, L.
Powiązania:: https://bibliotekanauki.pl/articles/949227.pdf
Data publikacji:: 2014
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: mechanical properties
magnetic Barkhausen effect
plastic strain
Opis:: In this work, an attempt at determination of mechanical properties by means of a method based on magnetic Barkhausen emission measurements was proposed. The specimens made of P91 steel were subjected to creep or plastic flow which were interrupted after a range of selected time periods in order to achieve specimens with an increasing level of strain. Subsequently, measurements of magnetic Barkhausen emission were carried out, and then static tensile tests were performed in order to check variations of basic mechanical parameters. It is shown that evident relationships between the yield point/ultimate tensile strength and some parameters of the Barkhausen emission exist.
Źródło:: Journal of Theoretical and Applied Mechanics; 2014, 52, 1; 181-188
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: An analytical study of couple stress fluid through a sphere with an influence of the magnetic field
Autorzy:: Krishna Prasad, Madasu
Sarkar, Priya
Powiązania:: https://bibliotekanauki.pl/articles/2202037.pdf
Data publikacji:: 2022
Wydawca:: Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:: creeping flow
sphere
magnetic effect
couple stress fluid
drag
przepływ pełzający
kula
efekt magnetyczny
Opis:: The present work concerns to study of the steady, axisymmetric slow flow of couple stress fluid through a rigid sphere in the transverse magnetic field. Boundary conditions on the sphere surface are the zero couple stress condition and tangential slip condition. The stream function, vorticity vector, and pressure term are obtained. The drag acting on the sphere in the presence of MHD is calculated. Here, we graphically represented the Hartmann number, couple stress, and slip parameters effect on the drag coefficient. Some well-known results of the drag are deduced.
Źródło:: Journal of Applied Mathematics and Computational Mechanics; 2022, 21, 3; 99--110
2299-9965
Pojawia się w:: Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Badanie zjawiska naciągu magnetycznego w wybranych stanach pracy tarczowego silnika indukcyjnego
Investigation of magnetic pull effect in selected operational conditions of disk induction motor
Autorzy:: Wolnik, T.
Powiązania:: https://bibliotekanauki.pl/articles/1199463.pdf
Data publikacji:: 2017
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:: naciąg magnetyczny
silniki tarczowe
silniki indukcyjne
magnetic pull effect
disk motor
induction motor
Opis:: Results of investigation of magnetic pull effect present in disk induction motor with a single air-gap are given in this paper. Among others, results of measurements of axial forces distribution occurring in the motor during idle run and under load conditions are shown. The obtained results were subject of frequency analysis to define the dominant harmonics in the waveforms of axial force under specified operating conditions of the machine.
W pracy przedstawiono wyniki badań i analizę zjawiska naciągu magnetycznego występującego w silniku tarczowym indukcyjnym z pojedynczą szczeliną powietrzną. Zaprezentowano między innymi pomiarowe wyniki przebiegów sił osiowych przy biegu jałowym silnika oraz w stanie obciążenia. Otrzymane przebiegi poddano analizie częstotliwościowej w celu zdefiniowania dominujących harmonicznych pulsacji siły osiowej w danych warunkach pracy maszyny.
Źródło:: Maszyny Elektryczne: zeszyty problemowe; 2017, 2, 114; 121-128
0239-3646
2084-5618
Pojawia się w:: Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The study of crystal and magnetic properties of MnNi0.85Fe0.15Ge
Autorzy:: Budzyński, M.
Valkov, V. I.
Golovchan, A. V.
Mitsiuk, V. I.
Sivachenko, A. P.
Surowiec, Z.
Tkachenka, T. M.
Powiązania:: https://bibliotekanauki.pl/articles/148187.pdf
Data publikacji:: 2015
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: Mössbauer effect
magnetic interaction
hexagonal structure
Opis:: Magnetic and Mössbauer measurements were performed for MnNi0.85Fe0.15Ge. The Mössbauer data indicate that Fe atoms in MnNi0.85Fe0.15Ge are randomly distributed over two types of metal sites in hexagonal structure. At 77 K, the hyperfi ne magnetic fi elds at Fe located in different crystal sites have similar values of about 12.7 and 12.3 T. The random site distribution of the iron atoms in the non-magnetic hexagonal phase at high temperatures is confi rmed by the theoretical calculations in fully relativistic Korringa−Kohn−Rostoker (KKR) method.
Źródło:: Nukleonika; 2015, 60, 1; 11-14
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: The influence of the low-frequency magnetic fields of different parameters on the secretion of cortisol in men
Autorzy:: Woldańska-Okońska, Marta
Czernicki, Jan
Karasek, Michał
Powiązania:: https://bibliotekanauki.pl/articles/2179794.pdf
Data publikacji:: 2013-03-01
Wydawca:: Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:: magnetic fields
cortisol secretion
stressogenic effect
Opis:: Objectives: The aim of this paper is to test the infl uence of long-term application of the low-frequency magnetic fi elds in magnetotherapy and magnetostimulation on cortisol secretion in men. Materials and Methods: Patients were divided into three groups: 16 men underwent magnetotherapy and 20 men (divided into two groups) underwent magnetostimulation. Magnetotherapy – 2 mT induction, 40 Hz, bipolar square wave, was applied for 20 min to lumbar area. Magnetostimulation (Viofor Jaroszyk, Paluszak, Sieroń (JPS) system, M2P2 program) was applied to 10 patients for 12 min each day. The third group (10 patients) underwent magnetostimulation (Viofor JPS system, M3P3) for 12 min each day using a different machine. All groups had 15 rounds of applications at approximately 10:00 a.m. with intermissions on the weekends. Blood serum was taken four times in a 24-hour period, before applications, the day after applications and a month later. Chemiluminescence micromethod was used to indicate hormone concentrations. Data was statistically analyzed with the analysis of variance (ANOVA) method. Results: The statistically signifi cant gains in the circadian cortisol profi le at 4:00 p.m., before and after application, were observed as a decrease in concentration during magnetotherapy. In magnetostimulation, with the M2P2 program, a signifi cant increase in the cortisol concentration was observed in circadian profi le at 12:00 p.m. one month after the last application. After magnetostimulation with the M3P3 program, a signifi cant increase in concentration at 6:00 a.m. and a decrease in concentration at 12:00 p.m. were observed one month later. Statistically signifi cant difference was demonstrated in the participants after the application of magnetotherapy and magnetostimulation with M3P3 program compared to the men submitted to magnetostimulation, with M2P2 program, at 4:00 p.m. after 15 applications. Conclusions: Biological hysteresis one month after magnetostimulation suggests long-term infl uence on the hypothalamohypophysial axis. The circadian curves of cortisol secretion a day after magnetotherapy and magnetostimulation with M3P3 program compared to magnetostimulation with M2P2 progam differs nearly by 100%, which proves that they show varied infl uence on cortisol secretion in men. All changes in the hormone concentration did not exceed the physiological standards of cortisol secretion, which suggests a regulating infl uence of magnetic fi elds on cortisol concentration rather than a strong stressogenic impact of magnetostimulation.
Źródło:: International Journal of Occupational Medicine and Environmental Health; 2013, 26, 1; 92-101
1232-1087
1896-494X
Pojawia się w:: International Journal of Occupational Medicine and Environmental Health
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Mathematical model of levitating cart of magnetic UAV catapult
Autorzy:: Sibilska-Mroziewicz, A.
Ładyżyńska-Kozdraś, E.
Powiązania:: https://bibliotekanauki.pl/articles/281639.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: magnetic catapult
equations of motion
Meissner eﬀect
Opis:: The article presents the steps of modeling of the dynamics of a levitating cart of an unmanned aerial vehicle (UAV) magnetic catapult. The presented in the article innovative catapult is based on the Meissner eﬀect occurring between high-temperature superconductors (HTS) and a magnetic ﬁeld source. The catapult suspension system consists of two elements: ﬁxed to the ground base with magnetic rails and a moving cart. Generating magnetic ﬁeld rails are made of neodymium magnets. Levitation of the launcher cart is caused by sixteen superconductors YBCO, placed in the cart frame supports. Described in the article model contains the system of Cartesian reference frames, kinematic constrains, equations of motion and description of forces acting on the cart as well as exemplary numerical simulation results.
Źródło:: Journal of Theoretical and Applied Mechanics; 2018, 56, 3; 793-802
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Modification of Magnetic Properties of Pt/Co/Pt Films by $Ga^{+}$ Ion Irradiation: Focused versus Uniform Irradiation
Autorzy:: Sveklo, I.
Mazalski, P.
Jaworowicz, J.
Jamet, J.
Vernier, N.
Mougin, A.
Ferré, J.
Kisielewski, M.
Zablotskii, V.
Bourhis, E.
Gierak, J.
Postava, K.
Fassbender, J.
Kanak, J.
Maziewski, A.
Powiązania:: https://bibliotekanauki.pl/articles/1398198.pdf
Data publikacji:: 2018-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: ultrathin films
ion irradiation
magnetic hysteresis
magnetic anisotropy
magneto-optic Kerr effect
Opis:: 30 keV $Ga^{+}$ irradiation-induced changes of magnetic and magneto-optical properties of sputtered Pt/Co/Pt ultrathin trilayers films have been studied as a function of the ion fluence. Out-of-plane magnetic anisotropy states with enhanced magneto-optical effects were evidenced for specific values of cobalt thickness and irradiation fluence. Results obtained after uniform or quasi-uniform focused ion beam irradiation on either out-of-plane or in-plane magnetized sputtered pristine trilayers are compared. Similar irradiation-induced magnetic changes are evidenced in quasi-uniformly focused ion beam or uniformly irradiated films, grown either by sputtering or molecular beam epitaxy. We discuss on plausible common mechanisms underlying the observed effects.
Źródło:: Acta Physica Polonica A; 2018, 133, 5; 1215-1226
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Spin reorientation process in Tm2–xHoxFe14B : analysis of conical arrangement based on Mössbauer spectra
Autorzy:: Kurzydło, P. M.
Pędziwiatr, A. T.
Bogacz, B. F.
Przewoźnik, J.
Oleszak, D.
Powiązania:: https://bibliotekanauki.pl/articles/148120.pdf
Data publikacji:: 2017
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: permanent magnetic materials
Mössbauer effect
spin reorientation
spin diagrams
Opis:: The spin reorientation process in the Tm2–xHoxFe14B series of compounds was studied using 57Fe Mössbauer spectroscopy over the temperature range 5.2–320 K with a focus on the analysis of conical spin arrangement. Each compound was studied by precise Mössbauer scanning in the vicinity of the transition and during the transition. By applying computer simulations based on the simplified Yamada-Kato model, as well as on some literature data for R2Fe14B (R = Tm, Ho) compounds, the above series was selected for studies as it contains compounds with different spin arrangements (axial, planar, conical). It was a crucial requirement for obtaining unambiguous angular dependences when applying a simultaneous fitting procedure of Mössbauer spectra. Such an extended procedure was applied which allowed the temperature dependence of the angle describing the position of the magnetization vector to be obtained. The results were compared with those from theoretical simulations. The spin arrangement diagram was constructed. A conical spin arrangement was confirmed over a wide temperature range.
Źródło:: Nukleonika; 2017, 62, 2; 123-127
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Temperature error of Hall-effect and magnetoresistive commercial magnetometers
Autorzy:: Nowicki, M.
Kachniarz, M.
Szewczyk, R.
Powiązania:: https://bibliotekanauki.pl/articles/141287.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: magnetic field measurement
magnetometers
Hall-effect
magnetoresistive
temperature error
Opis:: The paper presents a special measurement system for investigation of temperature influence on the indication of commercially available sensors of the magnetic field. Utilizing the developed system, several magnetoresistive and Hall-effect sensors were investigated within the temperature range from –30°C to 70°C. The obtained results indicate that sensitivity of most of the investigated sensors is unaffected, except the basic magnetoresistive device. However, Hall-effect sensors exhibit considerable temperature drift, regardless of the manufacturer.
Źródło:: Archives of Electrical Engineering; 2017, 66, 3; 625-630
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: The Structure and Magnetocaloric Effect of MnCoGe Alloy Modified by Nb
Autorzy:: Kutynia, Karolina
Gębara, Piotr
Przybył, Anna
Powiązania:: https://bibliotekanauki.pl/articles/2125529.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: magnetocaloric effect
Heusler alloys
X-ray diffraction
magnetic measurement
Opis:: The aim of this work was to investigate the effect of partial substitution of Mn by Nb on structure and thermomagnetic properties in the (Mn, Nb)-Co-Ge alloy. The master alloys were prepared by arc-melting in an arc furnace with high purity of constituent elements under a low pressure of Ar. The prepared specimens were studied in as-cast state. The X-ray was performed by BRUKER D8 Advance diffractrometer with Cu Kα radiation. The analysis of the XRD pattern revealed coexistence of two orthorhombic phases with different lattice constants. The analysis of the temperature dependence of magnetizaton confirmed the XRD results and showed that produced material manifested two magnetic phase transitions corresponding to detected phases. The values of the Curie temperature were 275 and 325 K. The values of magnetic entropy change ∆SM equaled 3.30 and 2.13 J/(kg K), respectively for recognized phases. Biphase structure of produced material allowed to reach relatively high refigeration capacity 307 J/(kg). Moreover, the analysis of field dependences of magnetic entropy change (∆SM = CBn) allowed to construct temperature dependence of exponent n. The analysis of elaborated n vs. T curve confirmed biphasic structure of produced material.
Źródło:: Archives of Metallurgy and Materials; 2022, 67, 3; 879--883
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: The Magnetic Entropy Changes in Pb Doped Ni-Mn-Cu-Ga Alloys
Autorzy:: Sielicki, K.
Zygmuntowicz, J.
Wróblewski, R.
Leonowicz, M.
Powiązania:: https://bibliotekanauki.pl/articles/354050.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: magnetocaloric effect
magnetic entropy change
Curie temperature
Heusler alloys
Opis:: Effect of Pb addition on magnetocaloric properties of Ni₅₀ Mn_18,75 Cu_6,25-aPb_aGa₂₅ (a = 1, 2, 3, 4, 5) alloys was investigated experimentally. The magnetic measurements conducted at low field of 4 kA/m showed that addition of Pb led to separation of the both transformation temperatures and significantly shifted the structural transition effect towards lower temperatures as well as increased the Curie temperature. The analysis of isothermal magnetic curves allowed for the calculation of magnetic entropychange (ΔS_M). Although the peak values of |ΔS_M| for alloys containing 4 and 5 at.% Pb, ~3 J/(kg*K) and ~1.5 J/(kg*K) respectively, are low they stretch over the structural transformation and Curie temperature, and are at least 30 K wide at half maximum height.
Źródło:: Archives of Metallurgy and Materials; 2020, 65, 2; 823-825
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Design and analysis of MOS based Magnetic Field Sensor
Autorzy:: Kumar, Rakesh
Powiązania:: https://bibliotekanauki.pl/articles/1075557.pdf
Data publikacji:: 2019
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: CMOS Technology
Hall Effect
Lorentz force
MagFET device
Magnetic sensor
Opis:: Magnetic sensors are widely used in various applications such as consumer electronic products (mobile phones, laptops), biomedical applications (brain function mapping), navigation, vehicle detection, mineral prospecting, non-contact switching (keyboard), contactless temperature measurement, wireless sensor network etc. Sensitivity of MagFET devices towards magnetic field, depends on the shape, dimensions VGS, VDS. In this paper we have measured effect of Physical design of gate on sensitivity of MagFET.
Źródło:: World Scientific News; 2019, 121; 42-47
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: A Device for Measuring the Rotational Speed of a Chain Sprocket of a Petrol Chainsaw
Autorzy:: Wróbel, Mateusz
Jakubek, Bartosz
Rukat, Wojciech
Powiązania:: https://bibliotekanauki.pl/articles/2123289.pdf
Data publikacji:: 2021
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: magnetic field
chainsaw
rotational speed measurement
chain sprocket
hall effect sensor
Opis:: The procedure for determining the frequency-weighted RMS values of vibration accelerations in the case of petrol chainsaws proposes equal time shares of three operation modes of the chainsaw. In order to assess the actual operator’s vibration exposure, it is necessary to precisely determine the above-mentioned shares. In real-life conditions operation of chainsaws is characterized by frequent and significant rotational speed changes depending on the operation mode. Therefore, a prototype of dedicated device for measuring the rotational speed of a chain sprocket was developed. The article presents development requirements, encountered problems and their solutions, the prototype itself and functional test results.
Źródło:: Advances in Science and Technology. Research Journal; 2021, 15, 3; 99--107
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Slip effects on squeezing flow of nanofluid between two parallel disks
Autorzy:: Das, K.
Jana, S.
Acharya, N.
Powiązania:: https://bibliotekanauki.pl/articles/264490.pdf
Data publikacji:: 2016
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: pole magnetyczne
tarcie
poślizg
nanofluid
slip effect
squeezing flow
magnetic field
Opis:: In this study, the influence of temperature and wall slip conditions on the unsteady flow of a viscous, incompressible and electrically conducting nanofluid squeezed between two parallel disks in the presence of an applied magnetic field is investigated numerically. Using the similarity transformation, the governing coupled partial differential equations are transformed into similarity non-linear ordinary differential equations which are solved numerically using the Nachtsheim and Swigert shooting iteration technique together with the sixth order Runge-Kutta integration scheme. The effects of various emerging parameters on the flow characteristics are determined and discussed in detail. To check the reliability of the method, the numerical results for the skin friction coefficient and Nusselt number in the absence of slip conditions are compared with the results reported by the predecessors and an excellent agreement is observed between the two sets of results.
Źródło:: International Journal of Applied Mechanics and Engineering; 2016, 21, 1; 5-20
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Using the Faraday effect in investigations of magnetic fields
Zastosowanie efektu Faradaya w badaniach pola magnetycznego
Autorzy:: Błażejczyk, T.
Powiązania:: https://bibliotekanauki.pl/articles/159532.pdf
Data publikacji:: 2010
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
Tematy:: efekt Faradaya
pole magnetyczne
magnes trwały
Faraday effect
magnetic field
permanent magnet
Opis:: The paper presents results of magnetic field investigations using the Faraday effect. The magnetic field source was the current flowing through an additional winding in a magnetoelectric motor. The possibility of using an optical fibre sensor for determining the value of an external magnetic field was analysed which can affect the permanent magnet during motor operation. Results of measurements of the tangential component of the magnetic induction in the air gap of the motor are presented, obtained using an optical fibre as a magnetic field sensor. The effect of the magnetic system design on the possibility of measuring the magnetic induction using an optical fibre sensor was analysed.
W artykule przedstawiono wyniki badań pola magnetycznego przy zastosowaniu efektu Faradaya. Źródłem pola magnetycznego był prąd przepływający przez dodatkowe uzwojenie w silniku magnetoelektrycznym. Analizowano możliwość zastosowania czujnika światłowodowego do określania wartości zewnętrznego pola magnetycznego, jakie może wpływać na magnes trwały w trakcie pracy silnika. Przedstawiono wyniki pomiarów składowej stycznej indukcji magnetycznej w szczelinie powietrznej silnika, uzyskanych przy zastosowaniu światłowodu jako czujnika pola magnetycznego. Analizowano wpływ konstrukcji układu magnetycznego na możliwość pomiaru indukcji magnetycznej przy zastosowaniu czujnika optycznego.
Źródło:: Prace Instytutu Elektrotechniki; 2010, 246; 13-33
0032-6216
Pojawia się w:: Prace Instytutu Elektrotechniki
Dostawca treści:: Biblioteka Nauki

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