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Tytuł:
Magnetic field of complex helical conductors
Autorzy:
Budnik, K.
Machczyński, W.
Powiązania:
https://bibliotekanauki.pl/articles/141527.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Biot-Savart law
magnetic flux density
helical line
Opis:
Transmission of the electric power is accompanied with generation of low –frequency electromagnetic fields. Electromagnetic compatibility studies require that the fields from sources of electric power be well known. Unfortunately, many of these sources are not defined to the desired degree of accuracy. This applies e.g. to the case of the twisted-wire pair used in telephone communication; already practiced is twisting of insulated high-voltage three phase power cables and single-phase distribution cables as well. The paper presents a theoretical study of the calculation of magnetic fields in vicinity of conductors having helical structure. For the helical conductor with finite length the method is based on the Biot-Savart law. Since the lay-out of the cables is much more similar to a broken line than to strait line, in the paper the magnetic flux densities produced by helical conductor of complex geometry are also derived. The analytical formulas for calculating the 3D magnetic field can be used by a software tool to model the magnetic fields generated by e.g. twisted wires, helical coils, etc.
Źródło:
Archives of Electrical Engineering; 2013, 62, 4; 533-540
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unconventional Superconductivity in Strong Magnetic Field
Autorzy:
Kowalewski, L.
Nogala, M. M.
Thomas, M.
Wojciechowski, R. J.
Powiązania:
https://bibliotekanauki.pl/articles/1955830.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.60.-w
74.62.-c
71.70.Di
74.20.Fg
Opis:
The Landau quantization effects are considered in low carrier concentration unconventional spin triplet p-wave superconductors in a high magnetic field region. The field dependence of the superconducting order parameter and the vortex lattice states for intra Landau level pairing are analyzed. The gap functions are calculated within mean field approximation.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 395-398
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
YIG Film for Magnetic Field Sensor
Autorzy:
Kaya, A.
Atalay, S.
Gencer, H.
Kaya, O.
Kolat, V.
Izgi, T.
Powiązania:
https://bibliotekanauki.pl/articles/1401218.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Gh
84.40.Az
75.30.Ds
41.20.Jb
85.75.Ss
Opis:
Single crystal $Y_3Fe_5O_{12}$ (YIG) film was grown onto (111) oriented gadolinium gallium garnet (GGG) substrate by the liquid phase epitaxy (PLD) technique. The X-ray diffraction measurements showed that epitaxial growth of the film along its (111) axis. The surface characteristic was investigated by atomic force microscopy (AFM) measurement. The magnetic field sensor consisted of a rectangular shape with 5 mm wide, 15 mm long and 5 μm thick YIG film and a pair of identical 50 μm wide microstrip copper transducers elements separated by 6 mm. The filter was tested by measuring reflection $S_{11}$ characteristic at various bias magnetic fields. The results have showed that when the bias field increased from 0 to 2.5 kOe, the frequency value corresponding to $S_{11}$ maxima increased from 1 GHz to 9 GHz. This suggests that the wide range magnetic field sensing and the highly sensitive field sensing are simultaneously fulfilled with the YIG film.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 937-939
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low Magnetic Field Response in Ferronematics
Autorzy:
Gdovinová, V.
Tomašovičová, N.
Závišová, V.
Éber, N.
Tóth-Katona, T.
Royer, F.
Jamon, D.
Jadzyn, J.
Kopčanský, P.
Powiązania:
https://bibliotekanauki.pl/articles/1031035.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Mm
61.30.Gd
61.30.Hn
Opis:
In this work the 4-n-hexyl-4'-cyanobiphenyl liquid crystal was doped with differently shaped magnetite nanoparticles. The structural changes were observed by capacitance measurements. Influence of the shape of magnetic particles on magnetic Fréedericksz transition depends on the type of anchoring, which is characterized by the density of the anchoring energy and by the initial orientation between the liquid crystal molecules and the magnetic moment of the magnetic particles. It was observed that in the case of doping with spherical particles, the critical magnetic field is shifted to higher values with increase of volume concentration of the magnetic nanoparticles but decreases with increase of biasing voltage. In the case of doping with rod-like particles, the critical magnetic field is almost independent of the volume concentration of the magnetic nanoparticles.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 934-936
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-Electron Quantum Dots in Magnetic Field
Autorzy:
Adamowski, J.
Spisak, B.
Powiązania:
https://bibliotekanauki.pl/articles/1968005.pdf
Data publikacji:
1997-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
Opis:
A theoretical description is given for electronic properties of semiconductor quantum dots in a magnetic field. A two-electron model is applied for electrons in a cylindrical quantum dot with a parabolic confinement potential. The eigenvalue problem is solved by the variational method with the trial wave function proposed in the form of linear combination of S-type and P-type Gaussians. The energy levels of singlet and triplet states with arbitrary radial and magnetic quantum numbers have been calculated as a function of the applied magnetic field. The calculated cyclotron transition energies agree well with those measured for InGaAs/GaAs quantum dots. It is shown that the electron-electron interaction has a small influence on the transition energy.
Źródło:
Acta Physica Polonica A; 1997, 92, 4; 695-698
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Field Induced Slow Magnetic Relaxation in KEr(MoO₄)₂
Autorzy:
Tkáč, V.
Orendáčová, A.
Tarasenko, R.
Pajerowski, D.
Čižmár, E.
Orendáč, M.
Anders, A.
Meisel, M.
Feher, A.
Powiązania:
https://bibliotekanauki.pl/articles/1385617.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.70.Ch
75.30.Gw
75.50.Xx
75.78.-n
Opis:
The spin dynamics of a layered magnetic insulator, KEr(MoO₄)₂, have been investigated in a magnetic field applied along the easy axis at temperatures where the magnetism is dominated by the occupation of a ground doublet. More specifically, the DC magnetization and AC susceptibility were studied in magnetic fields up to 5 T and at temperatures ranging from 1.8 to 20 K. The temperature dependence of the AC susceptibility suggests a slowing down of magnetic relaxation with increasing magnetic field. The magnetic field dependence of the AC susceptibility, studied at nominally 2 K, indicates the presence of low-field, intermediate-field, and high-field regimes characterized by the interplay of internal and external magnetic fields that give rise to different relaxation processes.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 353-355
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Field Induced Localization in Semiinsulating GaAs
Autorzy:
Łusakowski, J.
Merten, R.
Grynberg, M.
Powiązania:
https://bibliotekanauki.pl/articles/1920957.pdf
Data publikacji:
1992-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Jv
72.15.Gd
72.20.Ht
Opis:
Conductivity experiments were carried out on samples of semiinsulating GaAs at liquid helium temperature in magnetic field up to 6 T. During the measurements the samples were persistently illuminated with infrared light which allowed to populate with electrons a part of shallow donor and conduction band states. Current-voltage characteristics showed an abrupt jump of the current at a threshold electric field which is interpreted as a result of impact ionization of electrons bound on shallow donors and in the tail of the bottom of the conduction band. The jump of the current decreases as the magnetic field increases and disappears for a sufficiently high magnetic field B$\text{}_{0}$. The value of B$\text{}_{0}$ grows with growing light intensity. These results are explained by magnetic-field induced localization of electrons on long-range fluctuations of the electrostatic potential. The localization transition was confirmed by the current dependence on temperature measured at different magnetic fields. A peak on these curves was observed. Its position coincides with the temperature above which impact ionization is not observed. A possible mechanism explaining appearance of the peak is presented.
Źródło:
Acta Physica Polonica A; 1992, 82, 4; 551-560
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crack Detection Using Fluxgate Magnetic Field Sensor
Autorzy:
Izgi, T.
Goktepe, M.
Bayri, N.
Kolat, V.
Atalay, S.
Powiązania:
https://bibliotekanauki.pl/articles/1207662.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.75.Ss
46.50.+a
75.50.Kj
Opis:
In this study, the variation of the magnetic flux distribution in a magnetised ferromagnetic material which has in homogeneity as a crack is studied. An orthogonal fluxgate magnetic field sensor was used in the inspection of cracks. In the fluxgate sensor, the sensing element $(Co_{0.94}Fe_{0.06})_{72.5}Si_{12.5}B_{15}$ amorphous ferromagnetic wire was placed inside a pickup coil winding with 50 μm copper wire and connected to a signal generator and the output from pick-up coil was detected using a lock-in amplifier. The surface profile of magnetic materials with a crack was obtained using a specially designed 3-dimensional moving system. A large decrease in the output voltage of the sensor was observed when the sensor was moved on the top of the crack, after the further movement of the sensor the output voltage came back to the previous value.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 211-213
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wektorowy gradiometr pola magnetycznego
Magnetic field vector gradiometer
Autorzy:
Wołoszyn, M.
Powiązania:
https://bibliotekanauki.pl/articles/156108.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
gradiometr pola magnetycznego
pole magnetyczne
czujnik magnetyczny
magnetic field gradiometer
magnetic field
magnetic sensor
Opis:
W pracy przedstawiono metodę wyznaczania parametrów wektorowego gradiometru magnetycznego mających istotny wpływ na przybliżony pomiar pochodnych cząstkowych. Wartości pochodnych cząstkowych mierzone są w sposób przybliżony metodą różnicową. Dokładność pomiaru różnicy indukcji magnetycznej zależy od kąta przesunięcia osi czujników magnetycznych, przesunięcia zera i współczynnika skali czujników oraz od odległości między czujnikami. Skuteczność wykrywania obiektów ferromagnetycznych z zastosowaniem wektorowego gradiometru bez informacji o wartościach tych parametrów jest bardzo niska.
Five independent partial derivatives of the magnetic flux density vector are used for detecting ferromagnetic objects by use of vector gradiometers in algorithms of object locating and identifying. This method requires precise measurement of the magnetic flux density gradient (1). A gradiometer built of magnetometers with directional sensitivity characteristics has several parameters, called critical in this paper, that influence the measurement of partial derivatives in a significant way. The gradiometer critical parameters are: angle between the axis of magnetic sensors, offset, accuracy of measurements of separate sensors and the distance between them. The critical parameters values can be determined on a basis of measurements from formulas (4-8). Partial derivatives (1) are determined on a basis of measuring the difference quotient of the magnetic flux density. When choosing the distance sensors, their sensitivity and approximation of partial derivatives by difference quotients should be taken into account.
Źródło:
Pomiary Automatyka Kontrola; 2011, R. 57, nr 12, 12; 1525-1527
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Separation of Ho3+ in Static Magnetic Field
Autorzy:
Kołczyk, K.
Wojnicki, M.
Kutyła, D.
Kowalik, R.
Żabiński, P.
Cristofolini, A.
Powiązania:
https://bibliotekanauki.pl/articles/355096.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rare earth metals
REE
recycling
separation
magnetic field
Opis:
The rare earths elements (REE) belong to the group of critical metals and they are achieving more and more interest due to their special properties. However, there occur some problems connected with their production. The most difficult phase is separation of REE. It includes a necessity to intensify currently applied processes and looking for new solutions. The present work introduces an idea to use differences in physical properties of the REE ions to get them separated. In the experimental part of the work some efforts were undertaken to analyse results presenting changes of holmium ions concentration under an influence of the magnetic field gradient. There was determined the gradient of magnetic field and concentration of Ho3+ ions depending on initial concentration of the solution and time. A simulation of changing the concentration of holmium ions in the solution under an influence of the magnetic field gradient was performed to compare the mathematical model with the obtained results.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 1919-1924
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Translations for a Spatially Periodic Magnetic Field
Autorzy:
Florek, W.
Powiązania:
https://bibliotekanauki.pl/articles/2013243.pdf
Data publikacji:
2000-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.20.-a
73.40.Hm
71.70.Di
71.10.-w
Opis:
It is shown that in the case of a free electron in a spatially periodic magnetic field the concept of magnetic translations operators is still valid and, moreover, these operators can be defined in the same way as for a Bloch electron in a uniform magnetic field. The results can be a useful tool in the investigation of recently observed phenomena in 2D electron gas with spatially modulated density.
Źródło:
Acta Physica Polonica A; 2000, 97, 4; 619-628
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Near Magnetic Field of a Small Turbojet Engine
Autorzy:
Andoga, R.
Főző, L.
Powiązania:
https://bibliotekanauki.pl/articles/1030273.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
41.20.-q
Opis:
Different parameters like temperatures, pressures, speed, and vibrations are used in evaluation of technical state of turbojet engines. The article presents a pioneering idea to expand this set of parameters with measurements of distortions in magnetic field in a close vicinity of the engine to obtain more information about its state, which can be further used in its diagnostic and control systems. We believe that deviations in near magnetic field can hold valuable information, which can be used to predict malfunctions and evaluate the condition of the engine. The presented article shows pilot experimental results and gives answer to the basic hypothesis, if such measurements can be realized using a small turbojet engine, as well if there are significant changes in near magnetic field, which would warrant further research in the area.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1117-1119
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Field Dependence of Critical Attenuation in Ferromagnet
Autorzy:
Pawlak, A.
Powiązania:
https://bibliotekanauki.pl/articles/1427558.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.70.Jk
62.65.+k
Opis:
The influence of magnetic field on the sound attenuation is investigated in ferromagnets. With the aid of the Nelson method we derive frequency-, magnetic field- and temperature-dependent expression for the sound attenuation coefficient near a critical point in the Ising-type system. The shift of the ultrasonic attenuation peak under the influence of magnetic field towards higher temperatures is discussed.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1185-1187
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Field Effect on Sound Propagation in Antiferromagnets
Autorzy:
Pawlak, A.
Fechner, B.
Powiązania:
https://bibliotekanauki.pl/articles/1810483.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.70.Jk
62.65.+k
Opis:
On the basis of the theory of phase transitions, a model describing anomalies of sound attenuation coefficient close to the antiferromagnet-paramagnet phase transition in magnetic field was developed. The scaling behaviour of the sound velocity and attenuation coefficient was determined. The physical origin of the two-peak structure in the field dependent ultrasound attenuation observed in a number of antiferromagnets was identified. The theoretical results were compared with experimental results obtained for terbium.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 232-234
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fe-Based Nanocrystals in Weak External Magnetic Field
Autorzy:
Sitek, J.
Degmová, J.
Powiązania:
https://bibliotekanauki.pl/articles/1507129.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.45.+x
61.46.-w
75.50.Kj
Opis:
Nanocrystalline alloys of $Fe_{86.5}Zr_{6.5}Cu_1B_6$ and $Fe_{40.5}Co_{40.5}Nb_7B_{12}$ were measured by the Mössbauer spectrometry in the weak external magnetic field of 0.5 T. In these conditions the most sensitive parameters of the Mössbauer spectra are the intensities of 2nd and 5th lines and the values of internal magnetic field showed rather small changes. The amorphous part of the sample is more sensitive to the external influence than the nanocrystalline one. The behavior of nanocrystalline alloys under weak external magnetic field was analyzed within influence of interparticles interactions on the magnetic parameters.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 773-774
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum Dot Properties in a Strong Magnetic Field
Autorzy:
Matulis, A.
Anisimovas, E.
Powiązania:
https://bibliotekanauki.pl/articles/2038087.pdf
Data publikacji:
2004-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.21.La
71.10.-w
75.75.+a
Opis:
We present a quasiclassical approach to few-electron quantum dots in strong magnetic fields based on the notion of a collectively rotating Wigner molecule. A quasiclassical many-particle wave function is derived and illustrated by its application to a two-electron quantum dot. In particular, we calculate the density-current correlation function (conditional current) and show that the Wigner crystal in high magnetic fields may be visualized as an ordered system of current vortices.
Źródło:
Acta Physica Polonica A; 2004, 105, 6; 529-536
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Field Effects in Frustrated Low-Dimensional Magnets
Autorzy:
Schmidt, B.
Siahatgar, M.
Thalmeier, P.
Powiązania:
https://bibliotekanauki.pl/articles/1427076.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Jm
75.30.Cr
75.30.Ds
Opis:
We investigate the frustrated two-dimensional S = 1/2 next nearest neighbor anisotropic Heisenberg antiferromagnet on a square lattice as described by the $J_{1a,b} - J_2$ model. We use spin-wave theory and exact diagonalization for finite tiles including a new method for the finite size scaling procedure. We present results obtained from the extension of our numerical method to finite magnetic fields as well as from spin-wave theory. The induced uniform and the staggered moment in the antiferromagnetically ordered phases in the presence of a magnetic field are calculated. They deviate strongly from classical behaviour depending on frustration ratio $J_2//J_{1a,b}$ and the $J_{1a,b}$ exchange anisotropy. The magnetization becomes strongly nonlinear and is suppressed from the classical value. This is due to enhanced quantum fluctuations already at moderate frustration.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1089-1091
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resonance Spectra of Quantum Dots in Magnetic Field
Autorzy:
Bylicki, M.
Jaskólski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1969032.pdf
Data publikacji:
1998-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
73.61.-r
85.30.Vw
73.23.Hk
Opis:
Influence of magnetic field on the energy positions and widths of one electron resonance states in a multi-shell spherical quantum dot is investigated. The one-band effective mass approximation is assumed. The complexeigenvalue Schrodinger equation approach involving complex rotation of coordinates is used to obtain complex eigenenergies, E$\text{}_{r}$ - iΓ/2, corresponding to resonance states. We show how the magnetic field changes the resonance energy, E$\text{}_{r}$, and decay rate, Γ, yielding bound states for some particular cases.
Źródło:
Acta Physica Polonica A; 1998, 94, 2; 271-276
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coherent and Sequential Tunneling in High Magnetic Field
Autorzy:
Belyaev, A. E.
Vitusevich, S. A.
Maude, D.
Portal, J. C.
Powiązania:
https://bibliotekanauki.pl/articles/1968012.pdf
Data publikacji:
1997-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.40.Gk
85.30.Mn
Opis:
In the resonant tunneling diode incorporating a wide one-sided spacer layer, an oscillation picture has been studied in both polarities of the applied voltage in high magnetic field. The results lead to the conclusion that the interference between the electron waves running in the forward direction and the ones reflected at some potential step can occur in both the emitter and collector regions. The characteristic lengths corresponding to the path of the ballistic motion of electrons were estimated. An exchange enhancement of the electronic g-factor in two-dimensional systems was observed.
Źródło:
Acta Physica Polonica A; 1997, 92, 4; 704-708
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inhomogeneous Magnetic Field Penetration in Superconducting Niobium Films
Autorzy:
Abal'osheva, I.
Abal'oshev, A.
Cieplak, M.
Zhu, L.
Chien, C.
Powiązania:
https://bibliotekanauki.pl/articles/1537190.pdf
Data publikacji:
2010-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Ha
74.25.Uv
74.70.Ad
Opis:
The peculiarities of magnetic field penetration in the form of fingering or dendritic instabilities are studied by magneto-optical technique in the niobium films of different thickness. It is observed that the reduction of Nb film thickness reduces the threshold field for instabilities, in agreement with the theoretical predictions. In addition, it is shown that the silver overlayer deposited on the top of Nb film leads also to the enhancement of instabilities, in marked contrast to the effect of gold or aluminum overlayers, which are known to suppress instabilities.
Źródło:
Acta Physica Polonica A; 2010, 118, 2; 396-398
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Making of ferromagnetic elliptical shell in transverse magnetic field
Autorzy:
Jakubiuk, K.
Wołoszyn, M.
Zimny, P.
Powiązania:
https://bibliotekanauki.pl/articles/377889.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
ferromagnetic object
magnetic field
ferromagnetic shell
Opis:
A ferromagnetic object, located in the Earth’s magnetic field, changes its distribution. Through measuring such disturbances, one can locate the object and destroy it. To conceal the object, a special winding is placed inside its ferromagnetic shell, and its task is to eliminate the disturbances in the distribution of the Earth’s magnetic field. A thin walled elliptical shell, made of ferromagnetic material, is examined as the object model. There are coils, placed inside the shell, and their task is to generate a magnetic field, which is eliminating the effect, the shell is making on the distribution of the Earth’s magnetic field in the surrounding area. Such a procedure is called magnetic masking and the winding used for this purpose is called the masking winding. The possibility of building the masking windings for the ferromagnetic elliptical shell, situated in a transverse magnetic field respectively to its major axis, is also examined. The solution of Maxwell’s equations, which are describing the magnetic field distribution caused by the ferromagnetic shell presence in the Earth’s magnetic field, is found. Furthermore, the ability of selecting coils, which are eliminating the perturbations of the magnetic field outside the shell completely, is proven.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2013, 73; 131-136
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Germination of wheat grain in an alternating magnetic field
Autorzy:
Pietruszewski, S.
Kornarzynski, K.
Lacek, R.
Powiązania:
https://bibliotekanauki.pl/articles/25028.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
magnetic field
development
wheat grain
pre-sowing period
mathematical model
seed
germination
Źródło:
International Agrophysics; 2001, 15, 4
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
The magnetic field stimulation system applied on strawberry fruits
Autorzy:
Zaguła, G.
Puchalski, C.
Czernicka, M.
Bajcar, M.
Saletnik, B.
Woźny, M.
Szeregii, E.
Powiązania:
https://bibliotekanauki.pl/articles/410837.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
magnetic fields
strawberry
monosaccharides
firmness
pole magnetyczne
truskawki
monosacharydy
jędrność
Opis:
This paper presents an influence of three different magnetic fields stimulation systems for growing strawberry fruits: permanent magnetic field generated by neodymium magnets, ”high” strengths slow varying amplitudes magnetic fields generated by coreless solenoids supplied by autotransformer and low-frequency and low-amplitude sinusoidal magnetic fields generator created for this research. The system is controlled by computer and allows for an independent control of up to 10 induction coils inducing magnetic fields with amplitudes from 0.1μT to 150μT and frequencies from 0.1Hz to 100Hz. The proposed set-up was used during the growing seasons for strawberry plants stimulation. An increase in the extract level was observed in the case of the alternating magnetic field stimulation with the parameters: frequency – from 50Hz to 100Hz and amplitude – from 50μT to 100μT.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2017, 6, 1; 117-122
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solid State Plasma in the Pulse Modulated Magnetic Field
Autorzy:
Jankauskas, Z.
Barauskas, S.
Kvedaras, V.
Powiązania:
https://bibliotekanauki.pl/articles/1807893.pdf
Data publikacji:
2009-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
40.41.Cr
41.20.Jb
Opis:
Radio frequency (RF) magnetoplasmic waves known as helicons will propagate in solid-state plasma of semiconductors when a strong magnetic field is applied. Helicons have an exact analogy with an electromagnetic whistler wave which is frequently propagated in the low density plasma of the Earth ionosphere. In our experiments the modulated magnetic field is being used for excitation of helicons. It is shown that in the case of pulse modulated field along with the RF helicon waves the transient cyclotron frequency oscillations exist in the semiconductor plasma. For observation of the cyclotron radiation frequency $ω_c$ the modulation depth about one percent is sufficient. The measurement of $ω_c$ provides an opportunity to determine the masses of electrons and holes in solid-state plasma of semiconductors. In already existing method the absorption of electromagnetic radiation on the cyclotron frequency is being used. For this case it is necessary to have an external infrared generator. In our method the cyclotron radiation is being generated by electrons (or holes) directly and additional external excitation is not needed.
Źródło:
Acta Physica Polonica A; 2009, 115, 6; 1025-1027
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 752

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