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Wyświetlanie 1-50 z 1289
Tytuł:
Distribution system for generating slowly varying magnetic fields
Autorzy:
Zaguła, G.
Puchalski, C.
Czernicka, M.
Bajcar, M.
Saletnik, B.
Powiązania:
https://bibliotekanauki.pl/articles/411311.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
magnetic fields
magnetic stimulation
coils
Opis:
The presented system describes a concept for generating slowly varying signals to stimulate biological objects with magnetic field. The system enables independent control of up to 10 induction coil and it generates changeable signal inducing magnetic fields in the range from 0.1 to 150μT and the frequencies from 0.1 to 100 Hz. The proposed system was applied to investigate the influence of magnetic fields with the aforementioned parameters on physical and chemical properties in selected types of fruits.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2016, 5, 4; 73-78
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic seeding depression in flotation of hematite ore slimes
Autorzy:
Yue, T.
Wu, X.
Powiązania:
https://bibliotekanauki.pl/articles/110503.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
magnetic seeds
magnetic seeding flotation (MSF)
magnetic seeding agglomeration (MSA)
magnetic seeing depression (MSD)
hematite
Opis:
Magnetic seeding depression (MSD), i.e. adding organic depressant (such as starch) and magnetic seeds and applying a low field intensity pre-magnetization for depressing target mineral in flotation, was investigated in the reverse flotation of hematite ore slimes. Flotation tests found that the iron recovery increased with the addition of magnetic seeds; the depressing ability of starch in flotation was further enhanced by the MSD. The increased adsorption density of starch on target mineral hematite and apparent size enlargement of fine minerals are two reasons for the MSD. Based on FTIR, VSM and AFM measurements it was demonstrated that the starch acted as a bridging adsorption between hematite and magnetic seeds by hydrogen bonding and chemisorption, and resultant coverage of the magnetic seeds and starch on hematite increased the magnetic susceptibility, being beneficial to the agglomeration of hematite fines by reducing the external magnetic intensity needed for agglomeration to take place. The model of the MSD was proposed.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 3; 701-712
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-linear effects of operation temperature on a field-coupled current-controlled inductance
Autorzy:
Schierle, Guido
Meissner, Michael
Hoffmann, Klaus F.
Powiązania:
https://bibliotekanauki.pl/articles/24202733.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
magnetic coupling
magnetic devices
passive component
Opis:
In this publication the effect of the operating temperature on the effective inductance of a controllable inductor is analysed. The main difference compared to a coil with a simple single core lies in the current-controlled inductance-value. This is achieved by a second core implemented perpendicular upon the load-toroid affecting the saturation within a limited shared volume. Corresponding to the presented analysis, the dependencies on the core temperatures are investigated by measurements.
Źródło:
Archives of Electrical Engineering; 2023, 72, 2; 541-553
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method of the magnetic field formation in cyclotron DC-72
Autorzy:
Gulbekian, G.
Ivanenko, I.
Filatov, O.
Franko, J.
Kukhtin, V.
Lamzin, E.
Samsonov, E.
Semchenkov, A.
Semchenkova, O.
Sytchevsky, S. E.
Dmitrev, S. N.
Powiązania:
https://bibliotekanauki.pl/articles/148354.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
cyclotron
magnetic field measurements
magnetic field simulations
Opis:
A method of the magnetic field formation in the cyclotron DC-72 model (scale 1:5) is described. The cyclotron is planned to be built in Slovakia. The stages in the shimming of the cyclotron sectors and an automatic system designed for magnetic measurements are described. The data on the magnetic field measurements in the median plane of the cyclotron are presented. A brief description of a computer simulation model and an algorithm of fitting the required sector profiles is presented, as well as the data on the computer simulation of magnetic field distributions. The data on the magnetic field measurements and those on the computer simulations are compared and analyzed. Possible reasons of differences between the measured and simulated data are discussed. The results of the above mentioned computer simulations will be used for building a large facility - the cyclotron DC-72.
Źródło:
Nukleonika; 2003, 48, 4; 207-210
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conception of Magnetic Memory Switched by Time Dependant Current Density and Current Electron Spin Polarization
Autorzy:
Steblinski, Paul
Blachowicz, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/227198.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
spintronics
magnetic logic
BPM memories
magnetic simulations
Opis:
In this article the magnetic memory model with nano-meter size made from iron cells was proposed. For a purpose of determining the model specifications, the magnetic probes group with different geometrical parameters were examined using numeric simulations for the two different time duration of transitions among quasi-stable magnetic distributions found in the system, derived from the energy minimums. The geometrical parameters range was found, for which the 16 quasi–stable energetic states exist for the each probe. Having considered these results the 4 bits magnetic cells systems can be designed whose state is changed by spin-polarized current. Time dependent current densities and the current electron spin polarization directions were determined for all cases of transitions among quasi-stable states, for discovered set of 4 bits cells with different geometrical parameters. The 16-states cells, with the least geometrical area, achieved the 300 times bigger writing density in comparison to actual semiconductor solutions with the largest writing densities. The transitions among quasi-stable states of cells were examined for the time durations 10⁵ times shorter than that for up to date solutions.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 2; 309-312
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Konstruktivno-tekhnologicheskoe osobennosti prostranstvennykh magnitoprovodov trekhfaznykh staticheskikh indukcionnykh ustrojjstv moshhnostju do 10000 kV.A
The constructive-technological particularities of spatial magnetic cores o three-phased static induction devices of up to 10000 kV.A power
Autorzy:
Plakhtyr, O.
Powiązania:
https://bibliotekanauki.pl/articles/76465.pdf
Data publikacji:
2013
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
magnetic core
static induction device
magnetic flux
rod
Opis:
The analysis of constructivegeometrical and technological particularities is fulfilled and the classification of spatial magnetic cores of three-phased static induction devices is presented in the work. The direction of magnetic flux of rods, the shape and location of forming surfaces of rods and winding windows are accepted as the basic sings of magnetic core’s type.
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 2
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eksperymentalne badania czynników zmieniających warunki wspomagania polem magnetycznym
Experimental research on factors that change conditions of aiding by the magnetic field
Autorzy:
Burcan, J.
Sławińska, A.
Bednarek, R.
Powiązania:
https://bibliotekanauki.pl/articles/387463.pdf
Data publikacji:
2009
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
indukcja magnetyczna
pole magnetyczne
magnetic field
magnetic research
Opis:
Streszczenie: W pracy przedstawiono wyniki pomiarów indukcji magnetycznej w otoczeniu czół wysokoenergetycznych magnesów oraz wyniki pomiarów sił oddziaływania między dwoma magnesami. Wykazano, że rozkład wektora indukcji zależy od błędów kształtu magnesów i dokładności ich montażu. Znajomość rozkładu wektora indukcji w funkcji parametrów geometrycznych i materiałowych umożliwia dokładne określenie wartości siły odpychania się współpracujących magnesów. Jest ona niezbędna do poprawnego projektowania łożysk i prowadnic wspomaganych polem magnetycznym.
The study presents the results of magnetic induction measurements in the vicinity of front ends of high-energy magnets as well as the results of forces between two magnets measurements. It has been proved that the distribution of the induction vector is influenced by accuracy of magnets execution and mounting. The knowledge of the course of the induction vector variations as the function of geometry and material parameters enables to determine precisely the variation of the repulsion force value of the co-operating magnets, thus will be helpful when designing pairs unloaded by means of the magnetic field, e.g. bearings or slides.
Źródło:
Acta Mechanica et Automatica; 2009, 3, 1; 27-29
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculations of macroscopic eddy current losses in ferromagnetic materials considering hysteresis loop
Autorzy:
Bereźnicki, M.
Jabłoński, P.
Powiązania:
https://bibliotekanauki.pl/articles/378369.pdf
Data publikacji:
2018
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
eddy current power losses
magnetic hysteresis
magnetic nonlinearity
Opis:
The paper presents an algorithm for calculation of eddy current power losses caused by macroscopic eddy currents in ferromagnetic materials considering non-linearity of magnetization characteristics and magnetic hysteresis. The results of calculations are presented for a typical non-oriented steel sheet with silicon content of 6.5%. It has been found that inclusion of hysteresis loop and non-linearity of magnetization for the analyzed material has little effect on the calculated eddy current losses. Restrictions on the use of the algorithm are primarily due to the assumption of average values of the flux in the cross section of the sample, numerical problems when converting B → H and H → B for large increases in the induction, and the lack of regularity of the shape of the hysteresis loop measurements.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2018, 93; 205-214
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nuclear magnetic precession measured with SQUIDs
Autorzy:
Burghoff, M.
Powiązania:
https://bibliotekanauki.pl/articles/156431.pdf
Data publikacji:
2007
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
SQUID
nuclear magnetic precession
low magnetic field measurement
Opis:
We have developed a superconducting quantum interference devices (SQUID) system measuring nuclear magnetic precession at very low magnetic fields with a spectral resolution beyond the natural line width of liquids. A coil system applies a magnetic polarization field and a perpendicular static detection field to the sample. The detection system for the very weak magnetic field generated by the processing nuclei consists of LTc-SQUID sensors in a liquid helium cryostat. We measured the 'H precession signal of benzene, distilled water and chloroform samples at various detection fields. With our set-up. broad band detection of the nuclear magnetic resonance of the investigated liquids with a very high resolution is possible. Benzene showed the narrowest natural resonance line width of 0.12 Hz followed by chloroform of about 0.17 Hz. The observed line widths increased linearly with the detection field with a slope independent of the investigated sample. This increase is attributed to the inhomogeneity of the detection field, rather than to intrinsic properties of the investigated liquids, and thus describes the properties of our measurement system. Reliable low field NMR and MRI depend strongly on field homogeneity of the detection field coils and the residual field inside the agnetically shielded room. At such low fields, high demands on the absolute homogeneity of the static field correspond to very moderate requirements on its relative homogeneity 111. Reduction of these system parameters and its influence is the prerequisite for a good frequency and spatial resolution. Here, we investigated our SQUID measurement system and estimated all main system parameters at very low fields below a microtesla.
Źródło:
Pomiary Automatyka Kontrola; 2007, R. 53, nr 9 bis, 9 bis; 17-20
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on buildup of fine weakly magnetic minerals on matrices in high gradient magnetic separation
Autorzy:
Zheng, X.
Wang, Y.
Lu, D.
Powiązania:
https://bibliotekanauki.pl/articles/109662.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
particle buildup
force equilibrium
magnetic matrices
magnetic separation
Opis:
Buildup of magnetic mineral particles on matrices determines the saturated deposit volume of minerals, which is of great importance in the high gradient magnetic separation (HGMS) systems. In this paper buildup of fine weakly magnetic minerals on the matrix is studied with a force equilibrium model. Elaborate rules of particle buildup on the matrix are presented. An imaginary sector ring is used to approximately quantify the volume of saturated particle buildup. The influence of the particle size, magnetic induction, fluid viscosity and velocity as well as matrix size on saturated particle buildup is investigated and discussed. With the same matrix size, the saturated buildup volume decreases with the decrease of the particle size, applied magnetic induction and increase of the fluid viscosity and velocity. The saturated buildup volume normalized by the matrix volume, and the ratio of particle deposit volume to the matrix volume (Vd/Vm) decreases with the increase of the matrix size. Under the same matrices packing fraction, the total mineral deposit volume, when adopting small size matrices, is larger than that when adopting large size matrices. Only small size matrices can be used for recovery of minerals in size of several micrometers. Based on performed analyses, the ore feeding time in a cycle for a cyclic HGMS system and the rotation speed of the swivel for a continuous HGMS system under different circumstances are also discussed.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 1; 94-109
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selective agglomeration of magnetite in entlandite-serpentine system and implication for their separation
Autorzy:
Lu, J.
Yuan, Z.
Liu, J.
Li, L.
Wang, N.
Meng, Q.
Powiązania:
https://bibliotekanauki.pl/articles/110411.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
serpentine
pentlandite
magnetite
selective magnetic agglomeration
magnetic separation
Opis:
In nickel sulfide processing, magnesium silicates (serpentines) can easily form slime coatings or hetero-aggregation on pentlandite surfaces, and hence decrease the pentlandite flotation rate and recovery. In this work, magnetic separation of pentlandite from serpentine using selective magnetic coating through adding magnetite fines as magnetic seeds was investigated. Interactions of magnetite-pentlandite and magnetite-serpentine were calculated by the DLVO (Derjaguin-Landau-Verwey-Overbeek) theory. The results show that the interaction of magnetite-pentlandite was obviously stronger than that of magnetite-serpentine with an external weak magnetic field (4776 A/m-1). Therefore, fine magnetite fractions selectively adhered to the pentlandite surfaces and enhanced its magnetism, resulting in being separated from serpentine by magnetic separation, which was further verified by magnetic coating-magnetic separation and SEM observations.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 2; 943-955
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and numerical investigations and optimisation of grain-oriented silicon steel mechanical cutting process
Autorzy:
Patyk, Radosław
Bohdal, Łukasz
Gontarz, Szymon
Powiązania:
https://bibliotekanauki.pl/articles/2204588.pdf
Data publikacji:
2022
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
magnetic materials
shear slitting
sheared edge
magnetic properties
Opis:
The process of mechanical cutting of magnetic materials has many advantages in the form of high efficiency with reduced process costs in relation to other cutting technologies; no thermal stresses in the material, which significantly deteriorate the magnetic properties; or the possibility of shaping materials taking into account long cutting lines. In industrial practice, it is very difficult to ensure appropriate conditions for the cutting process and its proper control. Currently, there are no data on the selection of technological parameters of the mechanical shear slitting process of grain-oriented silicon steel in terms of the obtained cutting surface quality and the obtained magnetic properties of the workpiece. The article presents the possibilities of forecasting the characteristic features of the cut edge and selected magnetic properties of grain-oriented silicon steel. For this purpose, proprietary numerical models using FEA (Finite Element Analysis) were used. Then, experimental studies were carried out, and the optimisation task was developed. The developed results enable the correct selection of technological parameters of the process, ensuring the appropriate quality of the cut edge of steel and minimal interference with the magnetic properties.
Źródło:
Acta Mechanica et Automatica; 2022, 16, 3; 292--300
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
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:
Mathematica implementation of BEM model for magnetic field analysis in parallel conductors with time-harmonic currents
Implementcaja w Mathematice modelu MEB do analizy harmonicznego pola magnetycznego układu równoległych przewodów z prądem sinusoidalnym
Autorzy:
Jabłoński, P.
Powiązania:
https://bibliotekanauki.pl/articles/376039.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
time-harmonic magnetic field
magnetic field
BEM
conductors
Opis:
This paper presents a computational model for time-harmonic magnetic field analysis in a configuration of any number of long parallel conductors carrying currents or exposed to an externally applied transverse magnetic field. The model is based on the Boundary Element Method (BEM) and implemented in Mathematica by effective use of its built-in functions and algorithms. The cross-sections of the conductors can have any shapes, with or without holes. In addition, it is possible to add any number of filamentary currents. The model allows finding magnetic field at a given point, powers transmitted across the boundaries of the wires, and the matrix of self and mutual impedances of the considered set of wires. Examples of its use are presented.
W pracy przedstawiono model obliczeniowy dla pola EM w dowolnym układzie długich równoległych przewodów wiodących prądy sinusoidalne lub poddanych działaniu zewnętrznego poprzecznego pola magnetycznego. Model wykorzystuje metodę elementów brzegowych (MEB) i jest zaimplementowany w Mathematice, co pozwala na efektywne wykorzystanie wielu wbudowanych w nią funkcji i algorytmów. Przewody mogą mieć dowolne przekroje poprzeczne, pełne lub wydrążone. Można także dodać dowolną liczbę przewodów nieskończenie cienkich. Model pozwala na obliczanie pola magnetycznego w dowolnym punkcie, mocy wnikającej do obszarów przewodzących oraz macierzy impedancji własnych i wzajemnych. Zaprezentowano przykłady jego zastosowania.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 69; 65-72
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research of the Force Function Distribution in the Workplace of the Magnetic Disc Type Separator Intended for the Cleaning of Bulk Substances from the Ferromagnetic Impurities
Autorzy:
Shvedchykova, Iryna
Melkonova, Inna
Powiązania:
https://bibliotekanauki.pl/articles/411225.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
permanent magnet
force function
magnetic system
magnetic separator
Opis:
The paper deals with the magnetic system of the disk separator with permanent magnets. It is shown that the developed magnetic system can be used to purify finely dispersed friable substances from unwanted ferromagnetic inclusions. The main advantage of the magnetic system is the ability to self-clean the surface of a non-magnetic rotating discharging disk. The research of the distribution of the force function acting on multi-domain ferromagnetic particles in the working zone of the disk separator was carried out. To solve the main tasks of the study, a finite element method was implemented, realized in the COMSOL Multiphysics software environment. It is shown that when changing the air gap or the effective length of the poles, the distribution of the force function over the height of the working zone, as well as the magnitude of force, varies. The rational size of the air interpolar gap, which provides the maximum value of power force, was determined.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2019, 8, 3; 3-10
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of magnetic particles concentration in ferrooil on its magnetic susceptibility coefficient χ
Autorzy:
Frycz, M.
Anioł, A.
Powiązania:
https://bibliotekanauki.pl/articles/241625.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ferro-oil
magnetic particles concentration
magnetic susceptibility coefficient
Opis:
The purpose of this article is to determine the effect of the concentration of magnetic particles in ferro-oil on the value of its magnetic susceptibility coefficient χ. Determination of the flow and operating parameters of slide journal bearings lubricated with ferro-oils requires, inter alia, designation the first magnetization N and the magnetic induction B vector components, dependent on the magnetic propertis of the lubricant. The fundamental problem lies in the inability to make direct accurate measurement of magnetic induction in the lubricating gap of slide bearing and its solution is to determine it on the analytical and numerical way. A key issue for the accuracy of such solutions is to obtain reasonably accurate values of magnetic susceptibility χ. This article attempts to determine these values and estimate their relationship with the concentration of magnetic particles concentration in ferro-oil being potential lubricant above-mentioned bearings. In this paper, the authors present the characteristic of experimental test benches to determine the coefficients of the magnetic susceptibility. They present method of determining this value from obtained measurement data and analyse the impact of the magnetic particles concentration in ferro-oil on its magnetic susceptibility values. Tests were performed for selected concentrations of magnetic particles in ferro-oil ranging: 2%, 4%, 6% and 8% and the tested ferro-oil was product from Unterensingen FerroTec Company (Germany) which is a mixture of colloidal mineral engine oil LongLife Gold Penzzoil class SAE 15W-40 with addition of Fe3O4 magnetic particles and a surfactant.
Źródło:
Journal of KONES; 2014, 21, 4; 111-117
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Operating point resolved loss computation in electrical machines
Autorzy:
von Pfingsten, G.
Ruf, A.
Steentjes, S.
Hombitzer, M.
Franck, D.
Hameyer, K.
Powiązania:
https://bibliotekanauki.pl/articles/141566.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
efficiency maps
material degradation
magnetic losses
magnetic material
behaviour
soft magnetic materials
electrical machines
Opis:
Magnetic circuits of electromagnetic energy converters, such as electrical machines, are nowadays highly utilized. This proposition is intrinsic for the magnetic as well as the electric circuit and depicts that significant enhancements of electrical machines are difficult to achieve in the absence of a detailed understanding of underlying effects. In order to improve the properties of electrical machines the accurate determination of the locally distributed iron losses based on idealized model assumptions solely is not sufficient. Other loss generating effects have to be considered and the possibility being able to distinguish between the causes of particular loss components is indispensable. Parasitic loss mechanisms additionally contributing to the total losses originating from field harmonics, non-linear material behaviour, rotational magnetizations, and detrimental effects caused by the manufacturing process or temperature, are not explicitly considered in the common iron-loss models, probably even not specifically contained in commonly used calibration factors. This paper presents a methodology being able to distinguish between different loss mechanisms and enables to individually consider particular loss mechanisms in the model of the electric machine. A sensitivity analysis of the model parameters can be performed to obtain information about which decisive loss origin for which working point has to be manipulated by the electromagnetic design or the control of the machine.
Źródło:
Archives of Electrical Engineering; 2016, 65, 1; 73-86
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hard magnetic material measurements in a pulsed field magnetometer considering coating and eddy current effects
Autorzy:
Kern, Alexander
Leuning, Nora
Hameyer, Kay
Powiązania:
https://bibliotekanauki.pl/articles/24202740.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
eddy current effects
hard magnetic materials
magnetic property measurement
Opis:
Rare-earth permanent magnets are coated in order to avoid corrosion. When considering the rated geometrical properties of a sample, the coating thickness has to be known precisely as it wrongly enlarges the magnetically active volume which in turn affects the accuracy of the measured magnetic properties. In this work, the sensitivity of hard magnetic material property measurements regarding the consideration of different coating thicknesses is evaluated. Moreover, the impact of eddy current effects on the magnetic properties is studied when measuring in an open circuit. Additionally, an outlook for a measurement-based determination of the electric conductivity of permanent magnet samples is given.
Źródło:
Archives of Electrical Engineering; 2023, 72, 2; 407--414
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Functional MRI – how does it work?
Autorzy:
Truszkiewicz, Adrian
Aebisher, David
Przypek, Aneta
Guz, Wiesław
Bartusik-Aebisher, Dorota
Powiązania:
https://bibliotekanauki.pl/articles/454947.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
deoxyhemoglobin
oxyhemoglobin
Magnetic Resonance Imaging functional Magnetic Resonance Imaging
Opis:
Magnetic Nuclear Resonance (MRI) is a non-invasive tissue imaging method. This technique is based on the influence of a strong magnetic field and electromagnetic wave of strictly defined frequency on the nucleus of elements with non-zero spin. The study describes one of the variants of functional MRI, (fMRI), which has become a key technique in brain imaging. This technique has excellent spatial and temporal resolution and involves a changing signal intensity depending on the degree of oxygenation of the blood. Blood oxygenation levels are known to vary in accordance with neural activity and these differences can be used to detect brain activity. This is due to increased demand for energy and oxygen in the area of increased neural activity. The basis of this imaging is the so-called Blood Oxygenation-Level Dependent (BLOD) effect. The aim of this paper is to present the scope of fMRI as a diagnostic method in neurology and in neurosurgery. This paper presents the principles of fMRI, methods of application, research result development, and suggests areas of possible medical applications. The limitations of fMRI as a clinical tool in medical applications will also be addressed. Studies presented in this paper are based on clinical fMRI experience and a literature review.
Źródło:
European Journal of Clinical and Experimental Medicine; 2017, 2; 120-126
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Micaceous iron oxide production by application of magnetic separation
Autorzy:
Tanriverdi, M.
Sen, S.
Ciçek, T.
Powiązania:
https://bibliotekanauki.pl/articles/110370.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
micaceous iron oxide (MIO)
magnetic separation
belt type high gradient magnetic separator
high gradient magnetic separator
pulsating high gradient magnetic separator
Opis:
In this study, different flowsheet options were evaluated to achieve the best upgrading conditions for a micaceous iron oxide ore. The first option included the recovery of micaceous iron oxide particles using a double stage magnetic separation circuit after the grinding and classifying of the ore into coarse (-1000+106 μm) and fine (-106 μm) size fractions. A belt type dry high gradient magnetic separator (BHGMS) was used to beneficiate the coarse fraction. The concentrate of the BHGMS was ground to -106 μm, and combined with the fine fraction produced at screening stage, and subjected to high gradient magnetic separation (HGMS) at 1.2 T. A concentrate grading about 61.33% Fe with 60.3% recovery was obtained applying the separation process incorporating BHGMS and HGMS. A single stage separation circuit considering the use of HGMS after the grinding the ore below 106 μm was employed as the second concentration option. A concentrate having 63.80% Fe with 37.1% weight recovery was obtained in this test. As the highest Fe grade and the lowest S concentration was obtained by application of HGMS after the grinding the ore below 106 μm, and it was decided to conduct a pilot scale study using pulsating HGMS. A concentrate assaying 69.45% Fe with 60.1% weight recovery was produced by operating the pulsating HGMS at 0.6 T. The results showed that it was possible to obtain a micaceous iron oxide concentrate to be used in pigment production using magnetic separation method.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 2; 546-553
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of the stationary magnetic field on the germination of wheat grain
Autorzy:
Kornarzynski, K.
Pietruszewski, S.
Powiązania:
https://bibliotekanauki.pl/articles/26469.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
magnetic field
wheat
wheat grain
magnetic biostimulation
seed
germination
Źródło:
International Agrophysics; 1999, 13, 4
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rheumatoid arthritis: what do MRI and ultrasound show
Reumatoidalne zapalenie stawów w badaniu MR i ultrasonografii
Autorzy:
Sudoł-Szopińska, Iwona
Jans, Lennart
Teh, James
Powiązania:
https://bibliotekanauki.pl/articles/1033222.pdf
Data publikacji:
2017
Wydawca:
Medical Communications
Tematy:
magnetic resonance imaging
Opis:
Rheumatoid arthritis is the most common inflammatory arthritis, affecting approximately 1% of the world’s population. Its pathogenesis has not been completely understood. However, there is evidence that the disease may involve synovial joints, subchondral bone marrow as well as intra- and extraarticular fat tissue, and may lead to progressive joint destruction and disability. Over the last two decades, significant improvement in its prognosis has been achieved owing to new strategies for disease management, the emergence of new biologic therapies and better utilization of conventional disease-modifying antirheumatic drugs. Prompt diagnosis and appropriate therapy have been recognized as essential for improving clinical outcomes in patients with early rheumatoid arthritis. Despite the potential of ultrasonography and magnetic resonance imaging to visualize all tissues typically involved in the pathogenesis of rheumatoid arthritis, the diagnosis of early disease remains difficult due to limited specificity of findings. This paper summarizes the pathogenesis phenomena of rheumatoid arthritis and describes rheumatoid arthritis-related features of the disease within the synovium, subchondral bone marrow and articular fat tissue on MRI and ultrasound. Moreover, the paper aims to illustrate the significance of MRI and ultrasound findings in rheumatoid arthritis in the diagnosis of subclinical and early inflammation, and the importance of MRI and US in the follow-up and establishing remission. Finally, we also discuss MRI of the spine in rheumatoid arthritis, which may help assess the presence of active inflammation and complications.
Reumatoidalne zapalenie stawów (RZS) jest najczęstszą chorobą zapalną stawów, występującą u ok. 1% populacji światowej(1). Charakteryzuje się zapaleniem błony maziowej oraz zapaleniem kości, które prowadzą do powstania nadżerek kostnych, niszczenia chrząstki stawowej, destrukcji stawu, a co za tym idzie – trwałej niepełnosprawności(2). W ciągu ostatnich 20 lat znacznie poprawiło się rokowanie u chorych na reumatoidalne zapalenie stawów dzięki wprowadzeniu nowych strategii leczenia, zastosowaniu terapii biologicznej i lepszemu wykorzystaniu konwencjonalnych leków modyfikujących przebieg choroby(1). Szybka diagnoza i wdrożenie odpowiedniego leczenia stały się kluczowe dla uzyskania dobrego wyniku leczenia u chorych z wczesnym RZS(1). Artykuł w wersji polskojęzycznej jest dostępny na stronie http://jultrason.pl/wydawnictwa/volume-17-no-68
Źródło:
Journal of Ultrasonography; 2017, 17, 68; 5-16
2451-070X
Pojawia się w:
Journal of Ultrasonography
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Imaging of juvenile spondyloarthritis. Part II: Ultrasonography and magnetic resonance imaging
Diagnostyka obrazowa młodzieńczych spondyloartropatii. Część II: Ultrasonografia i rezonans magnetyczny
Autorzy:
Sudoł-Szopińska, Iwona
Znajdek, Michał
Gietka, Piotr
Vasilevska-Nikodinovska, Violeta
Patrovic, Lukas
Salapura, Vladka
Powiązania:
https://bibliotekanauki.pl/articles/1033388.pdf
Data publikacji:
2017
Wydawca:
Medical Communications
Tematy:
magnetic resonance imaging
Opis:
Juvenile spondyloarthropathies are mainly manifested by symptoms of peripheral arthritis and enthesitis. Early involvement of sacroiliac joints and spine is exceptionally rare in children; this usually happens in adulthood. Conventional radiographs visualize late inflammatory lesions. Early diagnosis is possible with the use of ultrasonography and magnetic resonance imaging. The first part of the article presented classifications and radiographic presentation of juvenile spondyloarthropathies. This part discusses changes seen on ultrasonography and magnetic resonance imaging. In patients with juvenile spondyloarthropathies, these examinations are conducted to diagnose inflammatory lesions in peripheral joints, tendon sheaths, tendons and bursae. Moreover, magnetic resonance also shows subchondral bone marrow edema, which is considered an early sign of inflammation. Ultrasonography and magnetic resonance imaging do not show specific lesions for any rheumatic disease. Nevertheless, they are conducted for early diagnosis, treatment monitoring and identifying complications. This article presents a spectrum of inflammatory changes and discusses the diagnostic value of ultrasonography and magnetic resonance imaging.
Młodzieńcze spondyloartropatie manifestują się głównie objawami zapalenia stawów obwodowych i entez. Wyjątkowo rzadko u dzieci dochodzi do wczesnego zajęcia stawów krzyżowo-biodrowych i kręgosłupa; z reguły następuje to po osiągnięciu wieku dorosłego. Tradycyjne radiogramy obrazują późne zmiany zapalne. Wczesne rozpoznanie jest możliwe w badaniu ultrasonograficznym i rezonansem magnetycznym. W pierwszej części artykułu przedstawiono klasyfikacje oraz obraz radiograficzny młodzieńczych spondyloartropatii. W tej części omawiamy zmiany w badaniu ultrasonograficznym i rezonansie magnetycznym. U pacjentów z młodzieńczymi spondyloartropatiami badania te są wykonywane w diagnostyce zmian zapalnych stawów obwodowych, pochewek ścięgnistych i ścięgien oraz kaletek. W rezonansie widoczny jest ponadto obrzęk szpiku w warstwie podchrzęstnej, uznawany za wczesny objaw zapalenia. Zmiany widoczne w ultrasonografii i rezonansie nie są specyficzne dla konkretnych chorób reumatycznych. Badanie te są wykonywane na etapie wczesnej diagnostyki, monitorowania leczenia oraz rozpoznawania powikłań. W artykule przedstawiamy spektrum zmian zapalnych oraz dyskusje na temat wartości diagnostycznej ultrasonografii i rezonansu magnetycznego. Artykuł w wersji polskojęzycznej jest dostępny na stronie http://jultrason.pl/index.php/wydawnictwa/volume-17-no-70
Źródło:
Journal of Ultrasonography; 2017, 17, 70; 176-181
2451-070X
Pojawia się w:
Journal of Ultrasonography
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Failure of magnetic fluid seals operating in water: preliminary conclusions
Autorzy:
Matuszewski, L.
Powiązania:
https://bibliotekanauki.pl/articles/259844.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
seal
magnetic fluid
Opis:
The article analyses properties of magnetic fluid seals installed in rotary sealing nodes which operate in the utility water environment. Seals of this type have been examined as a possible solution to the problem with ship manoeuvring propulsion sealing. The present analysis bases on laboratory durability tests of magnetic fluid seals exposed to longterm utility water loads, at different water pressures and shaft revolutions. The basic seal durability criterion was the number of revolutions made by the sealing node shaft until the appearance of water tightness loss (leakage). It was found that the main factor leading to the wear of the seal is the relative speed of the magnetic fluid with respect to that of the utility water, and this process is heavily affected by the pressure acting on the seal. The reported test results are presented in the form of diagrams showing the seal durability (time until water tightness loss) as a function of rotational speed. The curves shown in the diagrams are regular, with two different rotational speed ranges: the highspeed range, when the tightness loss is relatively fast, and the low-speed range, with a clear tendency to prolong the seal lifetime. These diagrams were given the name of durability curves of the MF seal operating in water. The results of the performed tests suggest formal similarity between the experimental data distribution concerning tightness loss processes occurring in magnetic fluid seals operating in water environment and metal fatigue processes. The article proposes a preliminary simplified durability model to describe the examined phenomenon.
Źródło:
Polish Maritime Research; 2017, 2; 113-120
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of 2D and 3D FEM analysis of the magnetic field in a PM servo motor
Autorzy:
Deeb, R.
Janda, M.
Makki, Z.
Powiązania:
https://bibliotekanauki.pl/articles/377200.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
PM servo motor
PM machine
magnetic field
2D magnetic analysis
3D magnetic analysis
FEM
Opis:
Nowadays, the applications of the electrical machines with permanent magnets become very common, because of the outstanding properties of these devices in comparison with the induction machines. PM machines do not indicate electrical losses with the field excitation, which means increasing of their efficiency. This is a very important factor considering the urgent need of the energy conservation. Although, numerical methods for a field computation are time consuming, they provide accurate results without making any simplification of the geometry. The paper presents a comparison of 2D and 3D magnetic analysis of a PM servo motor. The analyzed servo motor is designed with a surface magnet rotor and produced by the VUES Brno company. The applied PM material is of rare earth type NdFeB. This material is characterized by a very high energy product. 2D model of this servo motor is created using AutoCAD program. The 2D magnetic analysis is computed using FEMM (finite element method magnetics). The 3D magnetic analysis is computed using a modem technique in the field of magnetic analysis of electrical machines. 3D model of the servo motor is generated using RMxprt program. The 3D magnetic analysis of the generated 3D model is computed using Maxwell 3D program. The program Maxwell 3D generates fine mesh automatically with a high accuracy. The distribution of the magnetic field inside the servo motor is computed for the case of the nominal current in both of 2D and 3D magnetic analysis. The distribution of the magnetic flux density according to the air gap length is presented too. The FEM (finite element method) is used for both 2D and 3D magnetic analysis of this servo motor.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 72; 297-309
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative study of sensor and material properties on In₀.₅₃Ga₀.₄₇As/InP fabricated by MBE and MOCVD
Autorzy:
Wolkenberg, A.
Przesławski, T.
Powiązania:
https://bibliotekanauki.pl/articles/378441.pdf
Data publikacji:
2006
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Elektronowej
Tematy:
sensor
magnetic properties
Opis:
We report the galvanomagnetic properties of Hall and magnetoresistor cross-shaped sensors with lateral dimensions 2x3 mm. The comparative study of epilayers fabricated by MBE and MOCVD are presented. The measured parameters of these devices gave an interesting insight into their behaviour at temperatures ranging from LHe to room temperature. The large changes of the galvanomagnetic parameters vs. magnetic field and temperature allow these devices to be used as field or temperature sensors.
Źródło:
Electron Technology : Internet Journal; 2005-2006, 37/38, 1; 1-9
1897-2381
Pojawia się w:
Electron Technology : Internet Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A twin pregnancy with a hydatidiform mole and a coexisting live fetus: prenatal diagnosis, treatment, and follow-up
Ciąża bliźniacza przebiegająca w postaci zaśniadu groniastego współwystępującego z żywym płodem: rozpoznanie, postępowanie oraz obserwacja po zakończeniu ciąży
Autorzy:
Braga, Antonio
Obeica, Bruna
Werner, Heron
Yazaki Sun, Sue
Amim Júnior, Joffre
Rezende Filho, Jorge
Araujo Júnior, Edward
Powiązania:
https://bibliotekanauki.pl/articles/1033337.pdf
Data publikacji:
2017
Wydawca:
Medical Communications
Tematy:
magnetic resonance imaging
Opis:
Twin molar pregnancy with a hydatidiform mole and a coexisting live fetus is a rare form of gestational trophoblastic disease associated with an increased risk of obstetric complications and poor perinatal outcome. Prenatal diagnosis is essential for couple counseling and follow-up in Tertiary Reference Centers. Magnetic resonance imaging is important for the diagnostic differentiation of placental mesenchymal dysplasia and exclusion of myometrial invasion. Here we present a case of twin molar pregnancy with a hydatidiform mole and a coexisting live fetus diagnosed at gestational week 14 using two-dimensional (2D) and three-dimensional (3D) ultrasound and magnetic resonance imaging. We also describe the obstetric management and postmolar follow-up.
Zaśniad groniasty stanowi łagodną postać ciążowej choroby trofoblastycznej (gestational trophoblastic disease, GTD)(1). W Brazylii ciążowa choroba trofoblastyczna stwierdzana jest 5–10 razy częściej(2) niż w Stanach Zjednoczonych i Europie(3,4). Zaśniad groniasty powstaje w wyniku nieprawidłowego zapłodnienia komórki jajowej i może przybierać dwie formy: zaśniadu groniastego całkowitego lub zaśniadu groniastego częściowego(1). Z klinicznego punktu widzenia taka reprodukcja materiału genetycznego może prowadzić do rozwinięcia się ciążowej neoplazji trofoblastu, która bez wdrożenia właściwego leczenia może skutkować śmiercią kobiety(1–4). Artykuł w wersji polskojęzycznej jest dostępny na stronie http://jultrason.pl/index.php/wydawnictwa/volume-17-no-71
Źródło:
Journal of Ultrasonography; 2017, 17, 71; 299-305
2451-070X
Pojawia się w:
Journal of Ultrasonography
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Processing information from magnetic field sensors in helmet mounted cueing systems
Autorzy:
Szelmanowski, A.
Witoś, M.
Pazur, A.
Powiązania:
https://bibliotekanauki.pl/articles/1833874.pdf
Data publikacji:
2020
Wydawca:
Polskie Stowarzyszenie Telematyki Transportu
Tematy:
magnetic sensor
electromagnetic field
magnetic instrument
magnetic measurement
czujniki magnetyczne
pole elektromagnetyczne
przyrząd magnetyczny
pomiar magnetyczny
Opis:
In the XXI century, magnetic measurements are widely used in many diverse applications. In this paper, we present the practical application of magnetic measurements in the Helmet Mounted Cueing System (HMCS) on board military aircraft . We start with the research problem and proposed solutions (idea). Next, the theoretical basis of the helmet’s system operation are described. Herein, we include the characteristics of the Earth’s magnetic fi eld and the modeling of this (WMM 2015, IGRF 12, EMM2017), as well as the theory of magnetic fi eld distribution as generated in fl at coils, Helmholtz coils and anti-Helmholtz coils. In the later detailed part, we describe the metrological aspects of HMCS applications and the characteristics therein of diff erent magnetometers used in the tests, plus example test results. Finally, we describe ongoing research, while in the summary, we present further research possibilities and potential directions of research in the avionic implementation of magnetic phenomena in HMCS systems.
Źródło:
Archives of Transport System Telematics; 2020, 13, 1; 36--42
1899-8208
Pojawia się w:
Archives of Transport System Telematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Analysis of the Prospects of the Use of Magnetic Water Treatment in Foundry Engineering
Autorzy:
Dan, Leonid
Trofimova, Larysa
Powiązania:
https://bibliotekanauki.pl/articles/24201265.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
water
magnetic field
magnetic water treatment
molding sand
green strength
Opis:
Scientists are currently focused on creating technologies that produce positive results without affecting the environment. One such technology is magnetic water treatment. In this paper, an analytical review of publications devoted to the application of magnetic treatment of water in various branches of engineering, agriculture, and medicine is carried out. Current views on the structure of water molecules, as well as the theories explaining the influence of the magnetic treatment of water on its properties, are reviewed. The results of studies of the influence of water treated by a magnetic field on the properties of molding sand are analyzed, including those in which the authors of the article took part. It is shown that the magnetic treatment of still water can increase the green strength of the molding sand containing this water from 0.035 to 0.052 MPa, and that of water in motion to 0.075 MPa. Thanks to this, the amount of binder in the molding sand can be reduced. It is concluded that the use of magnetically treated water in foundries is promising.
Źródło:
Journal of Casting & Materials Engineering; 2023, 7, 2; 22--26
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sravnitelnyjj analiz materialoemkosti variantov trekhfaznykh prostranstvennykh elektromagnitnykh sistem
The comparing analysis of material consumption of three – phased spatial electromagnetic systems variants
Autorzy:
Plakhtyr, O.
Powiązania:
https://bibliotekanauki.pl/articles/76674.pdf
Data publikacji:
2015
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
magnetic core
magnetic flux
material consumption
spatial analysis
electromagnetic system
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 2
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Penetrative convection due to absorption of radiation in a magnetic nanofluid saturated porous layer
Autorzy:
Mahajan, Amit
Sharma, Mahesh Kumar
Powiązania:
https://bibliotekanauki.pl/articles/178577.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
magnetic nanofluids
penetrative convection
Darcy model
radiation absorption
magnetic field
Opis:
The present study investigates the onset of penetrative convection induced by selective absorption of radiation in a magnetic nanofluid saturated porous medium. The influence of Brownian motion, thermophoresis, and magnetophoresis on magnetic nanofluid treatment is taken into consideration. The Darcy’s model is selected for the porous medium. We conduct a linear stability analysis to examine the onset of instability and evaluate the results for two different configurations, namely, when the layer is heated from below and when the layer is heated from above. The numerical investigations are carried out by applying the Chebyshev pseudospectral method. The effect of the porosity parameter E, parameter Y (represents the ratio of internal heating to boundary heating), Lewis number Le, concentration Rayleigh number Rn, Langevin parameter αL, width of nanofluid layer d, diffusivity ratio η, and modified diffusivity ratio NA is examined at the onset of convection. The results indicate that the convection commences easily with an increase in the value of Y, Le, and NA but opposite in the case with a decrease in the value of E, αL, η and d for both the two configurations. The parameter Rn advances the onset of convection when the layer is heated from below, while delays the onset of convection when the layer is heated from above.
Źródło:
Studia Geotechnica et Mechanica; 2019, 41, 3; 129-142
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New designs of centrifugal magnetic fluid seals for rotating shafts in marine technology
Autorzy:
Matuszewski, Leszek
Powiązania:
https://bibliotekanauki.pl/articles/260045.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
magnetic fluids
ferrofluids
lubricants
magnetic seals
static seals
rotational seals
Opis:
The centrifugal magnetic fluid seals have important advantage over the conventional centrifugal seals. They maintain very good sealing capacity at static, medium and high speeds of shaft rotation, with the increased seal lifetime, and minimum torque and static friction. These seals are particularly useful in cases when the angular shaft velocity varies and sometimes decreases to nearly or exactly zero, such as in flywheel applications, ship propeller main shafts, etc. Unique properties of the magnetic fluid give rare opportunities for application in marine design, where perfect sealing together with reliable lubrication are required. The paper presents a typical design and operation principle of a centrifugal magnetic fluid shaft seal, along with new design solutions. Not only in ocean technology and underwater robotics. Some cases of application of centrifugal magnetic fluid seals in modern sealing technology are included.
Źródło:
Polish Maritime Research; 2019, 2; 33-46
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Soft Magnetic Properties of Fe-Zr-(Pt)-Nb-Cu-B Amorphous Alloys
Autorzy:
Gondro, J.
Błoch, K.
Nabiałek, M.
Walters, S.
Powiązania:
https://bibliotekanauki.pl/articles/356965.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
amorphous alloys
Mössbauer spectroscopy
magnetic susceptibility
Curie temperature
magnetic properties
Opis:
This paper presents the results of investigations into the microstructure and magnetic properties of Fe86Zr7Nb1Cu1B5, Fe82Zr7Nb2Cu1B8 and Fe81Pt5Zr7Nb1Cu1B5 alloys. The alloys were investigated in their as-quenched state, in the form of thin ribbons with approximate dimensions as follows: width 3 mm and thickness 20 μm. The investigations were performed utilizing Mössbauer spectrometry and X-ray diffractometry. Also, an evaluation of the low-field magnetic susceptibility and measurements of the magnetization versus temperature and magnetizing field were performed.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 707-710
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the influence of catastrophes on human vital activity
Issledovanie vlijanija katastrof na zhiznedejatel'nost' cheloveka
Autorzy:
Maletkin, V.
Druz, O.
Maletkina, L.
Powiązania:
https://bibliotekanauki.pl/articles/792498.pdf
Data publikacji:
2012
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
vital activity
catastrophe
magnetic field
safety
man
magnetic storm
investigation
Opis:
The analysis of the sources of catastrophes taking place on the Earth and influencing human vital activity has been done in this article.
Рассматриваются проблемы курсовой устойчивости движения автомобиля. В работе анализируется смена свойств управляемости на основе анализа нелинейной велосипедной модели, которая учитывает не линейность сил бокового увода. Получена обобщенная зависимость, определяющая «кривую управляемости». Проанализированы условия потери устойчивости для случая движения с возрастающей скоростью по окружности постоянного радиуса на основе построения бифуркацио нного множества.
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2012, 12, 3
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Miniaturowe, dwuosiowe czujniki pola magnetycznego - z rdzeniami z magnetyków amorficznych
Miniaturized, two axis magnetic field sensors with amorphous alloy cores
Autorzy:
Frydrych, P.
Szewczyk, R.
Salach, J.
Trzcinka, K.
Powiązania:
https://bibliotekanauki.pl/articles/277226.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
czujniki pola magnetycznego
anizotropia magnetyczna
magnetic field sensors
magnetic anisotropy
Opis:
W artykule przedstawiono koncepcję budowy dwuosiowych, transduktorowych czujników pola magnetycznego z rdzeniami z taśmy amorficznej. Jednocześnie przedstawiono nowatorską metodę kształtowania i badania charakterystyk magnesowania rdzeni ramkowych z taśmy amorficznej, wykorzystywanych jako rdzenie badanych czujników. Metoda ta umożliwia pomiar anizotropii magnetycznej rdzenia. Informacja o wartości anizotropii jest niezbędna przy budowie czujników dwuosiowych, a opisane do tej pory metody nie umożliwiały tego typu pomiarów.
Paper presents new conception of two-axis, fluxgate magnetic field sensors for measurements of Earth's magnetic field. Developed sensors utilizes soft amorphous alloys. Moreover paper presents new methodology of shaping and testing of magnetic characteristics of frame-shaped amorphous alloys cores utilized in such sensors. Presented methodology of testing enables direct measurements of magnetic anisotropy of amorphous alloy, what is required for development of two-axis fluxgate sensors.
Źródło:
Pomiary Automatyka Robotyka; 2011, 15, 2; 766-773
1427-9126
Pojawia się w:
Pomiary Automatyka Robotyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of the remanence influence on the transient states in a single-phase multiwinding transformer
Autorzy:
Wilk, A.
Michna, M.
Powiązania:
https://bibliotekanauki.pl/articles/141451.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
single-phase transformer
magnetic flux common
magneto motive force
magnetic hysteresis
residual magnetic flux
capacitor discharge test
Opis:
This paper presents the mathematical model of a single-phase multi-winding core type transformer taking into account magnetic hysteresis phenomenon based on the feedback Preisach model (FPM). The set of loop differential equations was developed for a K-th winding transformer model where the flux linkages of each winding includes flux Φ common to all windings as a function of magneto motive force Θ of all windings. The first purpose of this paper is to implement a hysteresis nonlinearity involved in the Φ(Θ) function which also accounts residual magnetic flux. The second purpose of this paper is experimental validation of the developed transformer model in a capacitor discharge test and several different values of residual magnetic flux.
Źródło:
Archives of Electrical Engineering; 2017, 66, 1; 41-54
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metodika ocenki kachestva shikhtovannykh magnitoprovodov ehlektricheskikh mashin po fakticheskomu sostojaniju
Estimation procedure for quality laminated magnetic circuit electric machine as the actual state
Autorzy:
Myslovich, M.
Chumack, V.
Ukotych, Y.
Powiązania:
https://bibliotekanauki.pl/articles/77058.pdf
Data publikacji:
2015
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
magnetic core
stamping
diagnostic system
collateral pathway
magnetic flux
calculation
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 2
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Models of viscosity characteristics η=η(b) of ferro-oil with different concentration of magnetic particles in the presence of external magnetic field
Autorzy:
Frycz, M.
Czaban, A.
Powiązania:
https://bibliotekanauki.pl/articles/244776.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ferro-oil
dynamic viscosity
magnetic particles concentration
external magnetic field
Opis:
The purpose of this article is to determine, identify and describe the viscosity characteristics of the ferro-oil with different concentrations of magnetic particles in the presence of an external magnetic field interaction. These characteristics are defined in the context of magnetic induction changes. These rheological tests were performed on a Physica MCR 301 rheometer. It was used a measuring system ‘plate to plate’ type which was armed with magneto-rheological research system MRD 180/1T. The tests were performed for the selected temperature of the medium i.e. 90°C, the shear rate θ changes were carried from 0 to 1000 1/s. Changes of the magnetic field intensity value were ranged from 0 to 500 mT. The selected concentrations of magnetic particles in a ferro-oil were 1%, 2%, 4%, 6% and 8% and the tested ferro-oil was product of FerroTec of Unterensingen (Germany), which is a mixture of colloidal mineral motor oil Penzzoil’s LongLife Gold's SAE 15W-40 with Fe3O4 magnetic particles and the surfactant. Analyses of the results, identify and matching characteristic were calculated using STATISTICA software. It has been proposed three categories of functions mapping the waveforms of the results obtained experimentally: the exponential function, logarithmic with basis of the normal and the polynomial function.
Źródło:
Journal of KONES; 2014, 21, 4; 119-126
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Curie Temperature and Microstructural Changes Due to the Heating Treatment of Magnetic Amorphous Materials
Autorzy:
Gondro, J.
Błoch, K.
Brągiel, P.
Nabiałek, M.
Szota, M.
Powiązania:
https://bibliotekanauki.pl/articles/958228.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
amorphous alloys
magnetic properties
magnetic susceptibility
Mössbauer spectroscopy
Curie temperature
Opis:
Three distinct alloys: Fe86Zr7Nb1Cu1B5, Fe82Zr7Nb2Cu1B8, and Fe81Pt5Zr7Nb1Cu1B5 were characterized both magnetically and structurally. The samples, obtained with spinning roller method as a ribbons 3 mm in width and 20 μm thick, were investigated as-quenched and after each step of a multi steps heating treatment procedure. Each sample was annealed at four steps, fifteen minutes at every temperature, starting from 573K+600K up to +700K depending on type of alloy. Mössbauer spectroscopy data and transmission electron microscope (HRE M) pictures confirmed that the as-quenched samples are fully amorphous. This is not changed after the first stages of treatment heating leads to a reduction of free volumes. The heating treatment has a great influence on the magnetic susceptibilities. The treatment up to 600K improves soft magnetic properties: an χ increase was observed, from about 400 to almost 1000 for the samples of alloys without Pt, and from about 200 to 450 at maximum, for the Fe81Pt5Zr7Nb1Cu1B5. Further heating, at more elevated temperatures, leads to magnetic hardening of the samples. Curie temperatures, established from the location of Hopkinson’s maxima on the χ(T) curve are in very good agreement with those obtained from the data of specific magnetization, σ(T), measured in a field of 0.75T. As a critical parameter β was chosen to be equal 0.36 for these calculations, it confirmed that the alloys may be considered as ferromagnetic of Heisenberg type. Heating treatment resulted in decreasing of TC. These changes are within a range of several K.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 451-456
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Zr and Nb on the Electrical and Magnetic Properties of the Fe-Zr-Nb-B-Cu Alloy
Autorzy:
Noh, Junghyun
Park, Seungyeon
Hwang, Haejin
Lim, Kyoungmook
Powiązania:
https://bibliotekanauki.pl/articles/350932.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
soft magnetic
magnetic properties
amorphous alloy
nanocrystalline alloy
electrical properties
Opis:
The present study, aims to investigate the effect of minor Zr and Nb alloying on soft magnetic and electrical properties of Fe86 (Zrx Nb1-x )7B6 Cu1 (x=1, 0.75, 0.5, 0.25) alloys. The investigated alloys were prepared through the melt spinning process. Within the examined compositional range (Nb up to 5.25 at%, respectively), the soft magnetic properties and electrical resistivity of the alloys continuously increase with increasing Nb content. However increasing the Nb content further decreases such properties. We could confirm the influence of ratio of Zr and Nb on grain growth and crystallization fraction during crystallization by using the soft magnetic properties and electrical properties.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 879-882
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement and simulation of a rotational single sheet tester
Autorzy:
Müller, Fabian
Bavendiek, Gregor
Schauerte, Benedikt
Hameyer, Kay
Powiązania:
https://bibliotekanauki.pl/articles/140359.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
finite element method
magnetic hysteresis
magnetization processes
soft magnetic material
Opis:
The accurate prediction of iron losses has become a prominent problem in electromagnetic machine design. The basis of all iron loss models is found in the spatial field-locus of the magnetic flux density (B) and magnetic field (H). In this paper the behavior of the measured BH-field-loci is considered in FEM simulation. For this purpose, a vector hysteresis model is parameterized based on the global measurements, which then can be used to reproduce the measurement system and obtain more detailed insights on the device and its local field distribution. The IEM has designed a rotary loss tester for electrical steel, which can apply arbitrary BH-field-loci occurring during electrical machine operation. Despite its simplicity, the proposed pragmatic analytical model for vector hysteresis provides very promising results.
Źródło:
Archives of Electrical Engineering; 2019, 68, 1; 173-183
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Static or dynamic low-frequency magnetic field? A review of literature
Statyczne czy zmienne pole magnetyczne niskiej częstotliwości? Przegląd piśmiennictwa
Autorzy:
Głąb, Grzegorz
Dudek, Jolanta
Klimek, Krzysztof
Skalska-Dulińska, Barbara
Urszula Chrabota, Urszula
Chojak-Fijałka, Katarzyna
Ridan, Tomasz
Glodzik, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/1798756.pdf
Data publikacji:
2016
Wydawca:
Akademia Wychowania Fizycznego im. Bronisława Czecha w Krakowie
Tematy:
low-frequency magnetic field
static magnetic field
magnetic field therapy
pole magnetyczne niskiej częstotliwości
stałe pole magnetyczne
magnetoterapia
Opis:
The therapeutic application of magnetic fi elds has experienced signifi cant growth in recent years. A small number of contraindications, as well as the lack of side effects makes both permanent magnets and alternating magnetic fi elds frequently used in physical therapy practice. In a signifi cant number of clinical studies the effi cacy of this physical factor as both an independent method, as well as supporting treatment programs has been confi rmed. In the last few years, a lot of emphasis is put on the fact that all therapeutic methods should have a scientifi c basis and their usage should meet the evidence based medicine criteria (EBM). Therefore, this work will focus on comparison of the use of permanent magnets and alternating low-frequency magnetic fi eld on the basis of the available literature, including mainly, a randomized double-blind trial. Analysis of the available literature on permanent magnet usage has shown clinical effi cacy in many diseases, however, placebo-controlled studies confi rm mainly the analgesic effect in patients after liposuction surgery, with diabetic neuropathy and with chronic pelvic pain. The use of the alternating low-frequency magnetic fi eld also leaves many questions to which scientists have still not found the answer. Randomized double-blind trial proved its therapeutic effi cacy in patients after knee arthroscopy, fractures and delayed bone unions, knee and cervical spine osteoarthritis as well as in case of leg ulceration. Alternating magnetic fi eld application has a wider therapeutic range in comparison to permanent magnets and its effectiveness is much better documented, both in clinical studies as well as randomized double-blind trials. Cite this article as: Głąb G., Dudek J., Klimek K., Skalska-Dulińska B., Chrabota U., Chojak-Fijałka K., Ridan T., Glodzik J. Static or dynamic low-frequency magnetic field? A review of literature. Med Rehabil 2016; 20(2): 31-35.
Terapeutyczne zastosowanie pól magnetycznych wykazuje w ostatnich latach znaczący rozwój. Niewielka liczba przeciwwskazań, jak również brak działań ubocznych przyczyniają się do częstego stosowania tych zabiegów w praktyce fizykoterapeutycznej. W znacznej liczbie prac klinicznych potwierdzono skuteczność tego czynnika fizykalnego zarówno jako samodzielnej metody, jak i wspomagającej w programach terapeutycznych. W terapii stosuje się zarówno magnesy stałe, jak i zmienne pola magnetyczne. W ostatnich latach kładzie się coraz większy nacisk na to, aby wszelkiego rodzaju metody lecznicze miały podstawy naukowe, a ich zastosowanie spełniało kryteria medycyny opartej na faktach (evidence based medicine). Autorzy niniejszej pracy skupią się zatem na omówieniu zastosowania magnesów stałych i zmiennego pola magnetycznego niskiej częstotliwości na podstawie dostępnej literatury obejmującej randomizowane badania na podwójnie ślepej próbie. Analiza dostępnej literatury dotyczącej stosowania magnesów stałych wykazała ich skuteczność kliniczną w wielu schorzeniach, badania z grupą placebo potwierdziły natomiast działanie głównie przeciwbólowe u pacjentów po zabiegach liposukcji, u osób z neuropatią cukrzycową oraz u pacjentek z przewlekłym bólem miednicznym. Zastosowanie zmiennych pól elektromagnetycznych niskiej częstotliwości również pozostawia wiele pytań, na które jak do tej pory naukowcy nie znaleźli odpowiedzi. W badaniach na podwójnie ślepej próbie udowodniono skuteczność terapeutyczną u pacjentów po artroskopii stawu kolanowego, złamaniach i opóźnionym zrostem kostnym, u osób ze zmianami zwyrodnieniowymi stawów kolanowych i kręgosłupa szyjnego, a także w przypadku owrzodzeń podudzi. Działanie pól zmiennych ma w porównaniu z magnesami stałymi znacznie większy zakres terapeutyczny, a skuteczność ich działania jest o wiele lepiej udokumentowana zarówno w badaniach klinicznych, jak i randomizowanych na podwójnie ślepej próbie.
Źródło:
Medical Rehabilitation; 2016, 20(2); 31-35
1427-9622
1896-3250
Pojawia się w:
Medical Rehabilitation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Repeat Station Network on the Baltic Sea - Why So Needed?
Autorzy:
Welker, E.
Reda, J.
Pałka, A.
Powiązania:
https://bibliotekanauki.pl/articles/320619.pdf
Data publikacji:
2017
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
Earth's magnetic field
marine magnetic repeat stations
secular geomagnetic field changes
Opis:
The development of navigation systems requires more and more accurate base data. Currently, attention is paid to utilization of geophysical fields - gravitational and magnetic ones - for navigation purposes. The Earth’s magnetic field distribution - both onshore and offshore - is complicated and variable in time. Hence, it is essential to precisely know the secular variations in the area of interest. In the case of Baltic Sea, this involves establishing (re-establishing) of a marine network of secular points (repeat stations) and regular magnetic measurements of the three independent components of the Earth’s magnetic field. Such measurements require equipment that ensures not only high stability, but also information about sensors’ orientation in relation to geographic north and to the level. This article presents a new project of the Baltic network of repeat stations and gives a solution for the instruments usable for quasi-absolute magnetic measurements.
Rozwój systemów nawigacyjnych wymaga posiadania coraz dokładniejszych danych. Dotyczy to również znajomości naturalnych pól fizycznych Ziemi, które są postrzegane jako niezwykle użyteczne dla nawigacji, zwłaszcza grawitacyjne oraz magnetyczne. Rozkład pola magnetycznego Ziemi jest bardzo zróżnicowany przestrzennie, a ponadto jest zmienny w czasie - tak na lądzie jak i we wszechoceanie. Stąd tak istotna jest dokładna znajomość jego rozkładu, a także zmian wiekowych. W przypadku Morza Bałtyckiego wymagałoby to ustanowienia (wznowienia) sieci punktów wiekowych na morzu i regularnych pomiarów trzech składowych pola magnetycznego Ziemi w tychże punktach. Tego rodzaju pomiary wymagają odpowiedniego sprzętu, gwarantującego wysoką stabilność czujników, ale również wymagają sensorów zapewniających dokładną orientację urządzenia pomiarowego względem kierunku geograficznego oraz pionu. W artykule przedstawiono projekt Bałtyckiej Sieci Punktów Referencyjnych oraz propozycje rozwiązań technologicznych do budowy urządzeń zapewniających quasi-absolutne pomiary pola magnetycznego na dnie morza.
Źródło:
Annual of Navigation; 2017, 24; 19-30
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nuclear fusion - energy for future
Autorzy:
Sadowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/147936.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
fusion reaction
magnetic confinement
inertial confinement
RPI facility
SM magnetic trap
Opis:
This invited paper has been written on the 50th anniversary of the Institute of Nuclear Research (IBJ). The introduction describes basic nuclear fusion reactions and the appearance of high-temperature plasma, as well as different methods of the plasma generation and containment. The first part of the paper contains a concise description of the present status of research on controlled fusion and the construction of a thermonuclear reactor. The most important results of experiments oriented on magnetic confinement fusion (MCF) or inertial confinement fusion (ICF) are characterized. The second part of the paper presents a story of high-temperature plasma research carried out at IBJ (and now continued at IPJ) at Świerk. The main experimental facilities and scientific results, as obtained with those, are described. The most important achievements of IBJ (IPJ) researchers in the field of plasma physics and technology are indicated, and in particular: invention and development of the so-called RPI facilities producing intense plasma-ion streams, discovery and experimental study of a new configuration of a magnetic trap called the spherical multipole (SM) configuration, development of various plasma diagnostic techniques, and the optimization of different plasmafocus (PF) facilities.
Źródło:
Nukleonika; 2005, 50,suppl.3; 53-58
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic biostimulation of wheat seeds
Autorzy:
Pietruszewski, S.
Kornarzynski, K.
Powiązania:
https://bibliotekanauki.pl/articles/26349.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
germination speed
wheat
magnetic exposure time
germination capacity
magnetic biostimulation
seed
Źródło:
International Agrophysics; 1999, 13, 4
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fully coupled multi-physics modeling of the multi-type magnetic particles dynamic behavior in low intensity magnetic separator
Autorzy:
Wang, Feiwang
Zhao, Hongming
Dai, Huixin
Du, Wuxing
Powiązania:
https://bibliotekanauki.pl/articles/109730.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
multi-physics model
low-intensity magnetic separator
magnetic particles
dynamic behaviour
Opis:
Studying the dynamic behavior of magnetic particle suspensions in the low intensity magnetic separator has important implications for various mineral beneficiation processes. A new approach for fully coupled multi-physics modeling of the dynamic behavior of multi-type magnetic particles (MTMPs) is developed in the study. In this model, the particle tracing module is employed to identify and determine individual particle trajectories in the fluid and magnetic field, which are modelled through the COMSOL Multiphysics. The results show that the different arrangements of the permanent magnet assembly and the volume percentage of interlocked particles affect the dynamic behavior of MTMPs and the efficiency of the separation. The model is compared with experiments and the particle capture theory and the correctness of the solution obtained from COMSOL is demonstrated. The model gives new possibilities to control, optimise, and develop the process of LIMS.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 1; 163-172
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of superconducting magnetic separation to an artificial mixture of chalcopyrite and molybdenite
Autorzy:
Li, Daokui
Kou, Jue
Sun, Chunbao
Yu, Baoqiang
Wang, Chao
Powiązania:
https://bibliotekanauki.pl/articles/110786.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
magnetic matrices
superconducting magnetic separation
buildup behavior
chalcopyrite and molybdenite separation
Opis:
Superconducting magnetic separation of chalcopyrite and molybdenite was studied, along with the effects of the magnetic flux density, slurry concentration, and pulsation amplitude on the separation. According to the force equilibrium model of magnetic particles that accumulated on magnetic matrices during the superconducting magnetic separation, the saturated buildup of magnetic particles was calculated. The saturated buildup of magnetic particles was an approximate fan ring and had a positive correlation with the background magnetic flux density. Superconducting magnetic separation tests results showed that a Mo concentrate with a Mo grade of 31.86% and recovery of 87.24% and a Cu concentrate with a Cu grade of 30.57% and recovery of 94.76% could be obtained. This verified the feasibility of separating mixed Cu and Mo minerals via superconducting magnetic separation.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 3; 597-604
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Equation of the magnetic field distribution of dynamo sheets taking into account crystallographic structure
Autorzy:
Mazgaj, Witold
Szular, Zbigniew
Sierżęga, Michał
Szczurek, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/140486.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
crystallographic texture
dynamo steel sheet
iron crystal
magnetic anisotropy
magnetic field
Opis:
The main purpose of the paper is to present a method which allows taking into account the anisotropic properties of dynamo steel sheets. An additional aim is to briefly present anisotropic properties of these sheets which are caused by occurrences of some textures. In order to take into account textures occurring in dynamo sheets, a certain sheet sample is divided into elementary segments. Two matrix equations, describing changes of the magnetic field, are transformed to one non-linear algebraic equation in which the field strength components are unknown. In this transformation the flux densities assigned to individual elementary segments are replaced by functions of flux densities of easy magnetization axes of all textures occurring in the given dynamo sheet. The procedure presented in the paper allows determining one non-linear matrix equation of the magnetic field distribution; in this equation all textures occurring in a dynamo sheet are included. Information about textures occurring in typical dynamo sheets may be used in various approaches regarding the inclusion of anisotropic properties of these sheets, but above all, the presented method can be helpful in calculations of the magnetic field distribution in anisotropic dynamo sheets.
Źródło:
Archives of Electrical Engineering; 2019, 68, 1; 185-194
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cluster Superconductivity in the Magnetoelectric $Pb(Fe_{1//2}Sb_{1//2})O_3$ Ceramics
Autorzy:
Laguta, V.
Marysko, M.
Stephanovich, V.
Raevsky, I.
Olekhnovich, N.
Pushkarev, A.
Radyush, Yu.
Raevskaya, S.
Kuzian, R.
Chlan, V.
Štěpánková, H.
Powiązania:
https://bibliotekanauki.pl/articles/1398326.pdf
Data publikacji:
2017-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
Multiferroics
Superconductivity
magnetic susceptibility
Opis:
We report the observation of cluster (local) superconductivity in the magnetoelectric $Pb(Fe_{1//2}Sb_{1//2})O_3$ ceramics prepared at a hydrostatic pressure of 6 GPa and temperatures 1200-1800 K to stabilize the perovskite phase. The superconductivity is manifested by an abrupt drop of the magnetic susceptibility at the critical temperature $T_{c}$ ≈7 K. Both the magnitude of this drop and $T_{c}$ decrease with magnetic field increase. Similarly, the low-field paramagnetic absorption measured by EPR spectrometer drops significantly below $T_{c}$ as well. The observed effects and their critical magnetic field dependence are interpreted as manifestation of the superconductivity and the Meissner effect in metallic Pb nanoclusters existing in the ceramics. Their volume fraction and average size were estimated as 0.1-0.2% and 140-150 nm, respectively. The superconductivity related effects disappear after oxidizing annealing of the ceramics.
Źródło:
Acta Physica Polonica A; 2017, 131, 6; 1534-1539
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Observations of the total intensity T of the geomagnetic field at secular points in the Hornsund area, Spitsbergen, 1980
Autorzy:
Koblański, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/2057282.pdf
Data publikacji:
1985
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Spitsbergen magnetic observations
Źródło:
Polish Polar Research; 1985, 6, 4; 537-542
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-50 z 1289

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