Skocz do pozycji: 1.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 2.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 3.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 4.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 5.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 6.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 7.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 8.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 9.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 10.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 11.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 12.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 13.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 14.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 15.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 16.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 17.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 18.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 19.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 20.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 21.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 22.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 23.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 24.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 25.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 26.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 27.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 28.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 29.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 30.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 31.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 32.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 33.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 34.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 35.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 36.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 37.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 38.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 39.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 40.

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 (Zr_x Nb_1-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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 41.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 42.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 43.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 44.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 45.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 46.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 47.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 48.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 49.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 50.

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

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 51.

Tytuł:

The method of magnetic research in the Hornsund Fiord area in Spitsbergen

Autorzy:

Koblański, Andrzej
Małoszewski, Stanisław
Śliz, Janusz

Powiązania:

https://bibliotekanauki.pl/articles/2057386.pdf

Data publikacji:

1984

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Arctic
magnetic research
Spitsbergen

Źródło:

Polish Polar Research; 1984, 5, 3-4; 275-281
0138-0338
2081-8262

Pojawia się w:

Polish Polar Research

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 52.

Tytuł:

Magnetic filtration/adsorption process for Snake River Plain Groundwater Treatment

Autorzy:

Cotten, G.
Eldredge, H.
Navratil, J.

Powiązania:

https://bibliotekanauki.pl/articles/148582.pdf

Data publikacji:

2003

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

groundwater
magnetic filtration
magnetite

Opis:

A magnetic filtration/adsorption process has been evaluated for development for groundwater treatment at the Idaho National Engineering and Environmental Laboratory (INEEL). The process uses inexpensive magnetite (FeOźFe2O3) in a supported mode surrounded by an external magnetic field. Prior studies have been shown to remove actinides and fission products in laboratory studies. This research has focused on supporting magnetite in an economical manner that promotes both magnetic filtration/adsorption of metal species and satisfactory water flow. The process utilizes the natural metal ion adsorptive properties of magnetite as well as the High Gradient Magnetic Separation (HGMS) effect for removing metal colloids and submicron particles. Results are presented on scoping studies for developing the process for groundwater treatment at the INEEL.

Źródło:

Nukleonika; 2003, 48, 1; 17-23
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 53.

Tytuł:

Role of ore mineralogy in selecting beneficiation route for magnesite-dolomite separation

Autorzy:

Yehia, A.
Al-Wakeel, M.

Powiązania:

https://bibliotekanauki.pl/articles/110660.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

magnetic separation
refractory materials

Opis:

Characterization and beneficiation of magnesite-dolomite sample were performed. The role of ore mineralogy in selecting the most adequate concentration method for magnesite-dolomite separation was found to be detrimental. The microscopic analysis showed that dolomite is stained with goethite and lepidocrocite (weakly magnetic minerals), while magnesite is stained with hematite and magnetite (highly magnetic mineral). A dry magnetic separation technique was used to separate dolomite from magnesite. The magnetic separation of the sample resulted in a magnesite concentrate product assaying 1.12% CaO with 46.02% recovery and CaO/SiO2 molar ratio = 1.62. This magnesite product is suitable for basic refractory. Besides, middling fraction was produced, containing 44.63% magnesite and 10.95% dolomite. This product is suitable for making low-loss forsterite dielectrics.

Źródło:

Physicochemical Problems of Mineral Processing; 2013, 49, 2; 525-534
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 54.

Tytuł:

Compass Deviation Revisited

Autorzy:

Narkiewicz, J.
Żugaj, M.

Powiązania:

https://bibliotekanauki.pl/articles/320793.pdf

Data publikacji:

2010

Wydawca:

Polskie Forum Nawigacyjne

Tematy:

magnetic compass
deviation
correction

Opis:

The system for calculating and updating deviation data for magnetic compass is developed. The method and algorithm for on-line data acquisition and calculation of new deviation corrections is presented. The system is tested by simulations and by experimental data. The system is developed for mobile platforms with compact electrical systems installed on-board with strong variation of vehicle electromagnetic field.

Źródło:

Annual of Navigation; 2010, 16; 75-87
1640-8632

Pojawia się w:

Annual of Navigation

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 55.

Tytuł:

Determination of the absolute values (D, H, T) of the geomagnetic field at secular points in the Hornsund area, Spitsbergen, 1979

Autorzy:

Koblański, Andrzej
Małoszewski, Stanisław
Śliz, Janusz

Powiązania:

https://bibliotekanauki.pl/articles/2057328.pdf

Data publikacji:

1985

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Arctic
Spitsbergen
magnetic measurements

Źródło:

Polish Polar Research; 1985, 6, 3; 357-364
0138-0338
2081-8262

Pojawia się w:

Polish Polar Research

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 56.

Tytuł:

Analysis of the Thermal and Magnetic Properties of Amorphous Fe61Co10Zr2.5Hf2.5Me2W2B20 (Where Me = Mo, Nb, Ni Or Y) Ribbons

Autorzy:

Gruszka, K.
Nabiałek, M.
Szota, M.
Bloch, K.
Gondro, J.
Pietrusiewicz, P.
Sandu, A. V.
Mustafa Al Bakri, A. M.
Walters, K.
Walters, S.
Garus, S.
Dośpiał, M.
Mizera, J.

Powiązania:

https://bibliotekanauki.pl/articles/355886.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

thermal stability
magnetic properties

Opis:

The paper presents the results of structural and magnetic properties and thermal stability for a group of functional materials based on Fe₆₁Co₁₀Zr_2.5Hf_2.5Me₂W₂B₂₀ (where Me = Mo, Nb, Ni or Y). Samples were obtained in the form of ribbons using melt-spinning method. The X-ray diffraction patterns of investigated samples confirmed their amorphous structure. Based on the analysis of DSC curves characteristic temperatures: glass forming temperature (T_g), crystallization temperature (T_x) and temperature range of the supercooled liquid ΔT_x were determined. Small addition of transition metals elements has strong influence on magnetic and thermal parameters of studied materials. The comprehensive studies revealed that in terms of magnetic properties the Ni-addition resulted in highest reduction in coercivity and anisotropy field.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 2A; 641-644
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 57.

Tytuł:

Chatter suppression in a high speed magnetic spindle by adding damping

Autorzy:

Uriarte, L.
Etxaniz, I.
Iturbe, I.
Zatarain, M.
Munoa, J.

Powiązania:

https://bibliotekanauki.pl/articles/100010.pdf

Data publikacji:

2014

Wydawca:

Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych

Tematy:

magnetic bearings
spindle
damping

Opis:

Magnetic bearings are used in several applications, but they didn’t succeed in the machine tool industry, due basically to their low damping, with its associated low chatter free cutting capacity. This work shows the development of a high speed milling spindle supported on magnetic bearings with high chatter resistance. That is achieved by using control strategies which add damping to the bearings. Excitation by means of the magnetic bearings is used to identify its dynamic behaviour and to optimize the damping parameters. Finally the results of the industrial validation are presented; showing an increase of six times in the cutting capacity.

Źródło:

Journal of Machine Engineering; 2014, 14, 4; 65-74
1895-7595
2391-8071

Pojawia się w:

Journal of Machine Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 58.

Tytuł:

Nanokompozyt poly(ε-kaprolakton)/tlenki żelaza dla zastosowań medycznych
Poly(ε-caprolactone)/iron oxides nanocomposite for medical applications

Autorzy:

Świętek, M.
Gwizdała, J.
Tokarz, W.
Menaszek, E.
Błażewicz, M.

Powiązania:

https://bibliotekanauki.pl/articles/285834.pdf

Data publikacji:

2014

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

magnetyczne nanokompozyty
polimery
magnetyt
cząstki magnetyczne
magnetic nanocomposites
polymer
magnetite
magnetic particles

Opis:

Nanokompozyty polimerowe stanowią szeroką grupę materiałów znajdujących zastosowanie zarówno w wielu gałęziach przemysłu, jak i w medycynie. Fenomen nanokompozytów związany jest z łatwością modyfikacji ich cech materiałowych będących pochodną właściwości zarówno samego polimeru, jak i zastosowanego nanododatku. Pozwala to na projektowanie oraz wytwarzanie materiałów o określonej charakterystyce, adresowanych do konkretnych potrzeb. Celem niniejszej pracy było otrzymanie oraz charakterystyka polimerowych nanokompozytów o właściwościach magnetycznych. Jako osnowę polimerową wykorzystano biozgodny i bioresorbowalny poli(ε-kaprolakton), do którego wprowadzono cząstki magnetytu znajdujące się w dyspersji nanometrycznej. Do przygotowania materiałów zastosowano prostą metodę odlewania filmu/odparowania rozpuszczalnika. W celu zbadania wpływu zawartości nanododatku na właściwości nanokompozytu przygotowano serię materiałów różniących się od siebie ilością wprowadzonych do matrycy polimerowej cząstek magnetycznych (0; 0,5; 1 oraz 2%). Charakterystyka nanokompozytów obejmowała badania własności magnetycznych i powierzchniowych materiałów oraz ocenę ich degradacji oraz biozgodności. Pętle histerezy wprowadzonego do matrycy polimerowej nanododatku oraz otrzymanych nanokompozytów wykazywały przebieg typowy dla multidomenowych materiałów ferrimagnetycznych. Zaobserwowano, że istnieje korelacja pomiędzy wartością namagnesowania nasycenia oraz remanencją, a zawartością cząstek magnetycznych w nanokompozycie. Na podstawie obserwacji mikroskopowych stwierdzono, że część wprowadzonych cząstek magnetycznych ulega aglomeracji, reszta zaś pozostaje w dyspersji nanometrycznej. Wytworzone materiały nie wykazały toksycznego wpływu na komórki (Normal Human Osteoblast), co pozwala sądzić, że otrzymane nanokompozyty mogłyby zostać wykorzystane w medycynie.
Polymer nanocomposites are a wide group of materials which have applications in many branches of industry as well as in medicine. The phenomenon of nanocomposites is associated with simplicity of modification of their features, which are derived from properties of both the polymer matrix and the nanoadditive. This property enables to design and fabricate materials with strictly defined characteristics, addressed to specific needs. The aim of the presented studies was fabrication and characterization of polymer nanocomposites with magnetic properties. As a polymer matrix, a biocompatible and bioresorbable poly(ε-caprolactone) was used. Magnetite powder with nanometer-sized grain fraction was introduced into the polymer matrix as a magnetic nanoadditive. As a fabrication method casting film/solvent evaporation was applied. In order to examine how amount of magnetic nanoadditive influences the properties of nanocomposites, the series of materials with various concentrations of magnetic particles was prepared (0, 0.5, 1 and 2%). Characterization of materials included magnetic and surface properties investigations as well as evaluation of degradability, and biocompatibility of the fabricated materials. Magnetic hysteresis loops of both the nanoadditive itself and the nanocomposite demonstrate curves typical for multi-domain ferromagnetic materials. Existence of the correlation between the values of magnetic saturation and remanence, and the content of magnetic particles has been observed. Microscopic evaluations have shown that small part of magnetic particles has tendency to agglomerate but the rest remains in nanometric dispersion. For the fabricated materials no cytotoxic influence on the cells was observed (Normal Human Osteoblast). This suggests that obtained nanocomposites could find application in medicine.

Źródło:

Engineering of Biomaterials; 2014, 17, 127; 22-32
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 59.

Tytuł:

Modification of Magnetic Properties of Pt/Co/Pt Films by $Ga^{+}$ Ion Irradiation: Focused versus Uniform Irradiation

Autorzy:

Sveklo, I.
Mazalski, P.
Jaworowicz, J.
Jamet, J.
Vernier, N.
Mougin, A.
Ferré, J.
Kisielewski, M.
Zablotskii, V.
Bourhis, E.
Gierak, J.
Postava, K.
Fassbender, J.
Kanak, J.
Maziewski, A.

Powiązania:

https://bibliotekanauki.pl/articles/1398198.pdf

Data publikacji:

2018-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

ultrathin films
ion irradiation
magnetic hysteresis
magnetic anisotropy
magneto-optic Kerr effect

Opis:

30 keV $Ga^{+}$ irradiation-induced changes of magnetic and magneto-optical properties of sputtered Pt/Co/Pt ultrathin trilayers films have been studied as a function of the ion fluence. Out-of-plane magnetic anisotropy states with enhanced magneto-optical effects were evidenced for specific values of cobalt thickness and irradiation fluence. Results obtained after uniform or quasi-uniform focused ion beam irradiation on either out-of-plane or in-plane magnetized sputtered pristine trilayers are compared. Similar irradiation-induced magnetic changes are evidenced in quasi-uniformly focused ion beam or uniformly irradiated films, grown either by sputtering or molecular beam epitaxy. We discuss on plausible common mechanisms underlying the observed effects.

Źródło:

Acta Physica Polonica A; 2018, 133, 5; 1215-1226
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 60.

Tytuł:

Analiza wpływu wirującego pola magnetycznego na produkcję ferrocieczy
Experimental study of ferrofluid production exposed to a rotating magnetic field

Autorzy:

Rakoczy, R.
Masiuk, S.
Grądzik, P.

Powiązania:

https://bibliotekanauki.pl/articles/2071138.pdf

Data publikacji:

2010

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

ferrociecz
magnetyczne ferrocząstki
wirujące pole magnetyczne
ferrofluid
magnetic nanoparticles
rotating magnetic field

Opis:

Celem prezentowanej pracy jest wyznaczenie wpływu wirującego pola magnetycznego na reakcję chemiczną, której produktem jest koloidalna zawiesina magnetyt o cząstkach charakteryzujących się wymiarem rzędu -10 nm. W pracach badawczych przeanalizowano wpływ zmian natężenia pola magnetycznego oraz objętości dodawanej wody amoniakalnej na otrzymywaną ilość magnetytu. Otrzymane wyniki zostały porównane z masą osadu uzy-skanąz reakcji prowadzonej bez obecności wirującego pola magnetycznego. Uzyskane rezultaty zostały opracowane w formie zależności analitycznej.
Fe3O4 magnetic nanoparticles (ferrofluid) were prepared by Fe2+ and Fe3+ co-precipitation using NH4OH under rotating magnetic field to enhance the crystallization of Fe3O4 ferrofluid. It was found that the mass of Fe3O4 ferrofluid depended on the applied volume of NH4OH and magnetic field intensity. In addition, the analytical dependence describing mass variation of Fe3O4 ferrofluid is proposed.

Źródło:

Inżynieria i Aparatura Chemiczna; 2010, 3; 101-102
0368-0827

Pojawia się w:

Inżynieria i Aparatura Chemiczna

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 61.

Tytuł:

Pomiary parametrów materiałów magnetycznych przy alternatywnych wariantach wymuszenia sygnału magnesującego
Measurements of magnetic material parameters at alternative variants of magnetizing signal excitation

Autorzy:

Kwiczala, J.
Kolano-Burian, A.

Powiązania:

https://bibliotekanauki.pl/articles/151264.pdf

Data publikacji:

2009

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

materiał magnetyczny
sygnał magnesujący
pomiary magnetyczne
magnetic material
magnetizing signal
magnetic measurements

Opis:

W artykule przedstawiono wyniki pomiarów parametrów próbek materiałów magnetycznych przy zastosowaniu różnych wariantów wymuszenia sygnału magnesującego. Sinusoidalne wymuszenie napięciowe sygnału powoduje sinusoidalne wymuszenie indukcji magnetycznej, co powoduje odkształcenie natężenia pola, natomiast sinusoidalne wymuszenie prądowe sygnału magnesowania powoduje sinusoidalne wymuszenie natężenia pola, co skutkuje odkształceniem indukcji (strumienia magnetycznego). Porównano parametry podstawowych parametrów opisujących właściwości materiałów magnetycznych badanych próbek otrzymane dla dwóch wariantów wymuszeń pola.
The parameters of magnetic materials are determined by both the autonomic measuring stands, i.e. the volt-ampermeter method and the impedances bridges or the computer measuring systems. The sources of signal in measuring system to investigation of magnetic material parameters are alternating current power supplies. However, in automated measuring systems, the final unit of track feeding is power amplifier. It permits to extorting both the proper value of voltage and to supply the tested sample appropriate large current. The Polish Standard allows two variants of sinusoidal signal ex-tortion to investigation of magnetic materials. First of them is sinusoidal extortion of magnetic flux density B while the second variant admits to sinusoidal signal extortion of field intensity H into the tested sample. Extortion from theoretically ideal voltage source signal corresponds to the first option, while in the second variant is necessary ideal current source. In practice, to comply with requirement of the Standard, it is necessary to assure the condition of a much smaller or a much larger internal source impedance in relation to impedance of magnetizing winding of the test sample, respectively to condition of voltage or current extortion. Disposing of either the power supply with well-known internal impedance or the amplifier with well-known output impedance this condition be comply with properly selection of magnetizing winding number of turns. The investigation of magnetic materials of different samples in which was executed either the force of sinusoidal magnetic flux density, which effects the deformation of intensity of the field strength or sinusoidal force of the field strength which causes the deformation of magnetic flux is presented. The essential parameters of the magnetic materials of the test samples to obtain by means of two variants input signal force were compared. The investigations showed distinctness of measurements results of parameters of the same samples by applying the different variants of signal extortions admitted by the Standard.

Źródło:

Pomiary Automatyka Kontrola; 2009, R. 55, nr 12, 12; 1004-1007
0032-4140

Pojawia się w:

Pomiary Automatyka Kontrola

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 62.

Tytuł:

Pallet motion on a magnetic brake roller

Autorzy:

Sharifullin, Ildar
Nosko, Andrey
Safronov, Eugene

Powiązania:

https://bibliotekanauki.pl/articles/2106203.pdf

Data publikacji:

2022

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

pallet
rack
gravity flow rack
magnetic brake roller
coefficient of magnetic viscosity

Opis:

The brake roller is one of the elements for the safe operation of gravity flow pallet racks. The brake roller of the magnetic (eddy current) type magnetic brake roller (MBR) is the most promising brake type. The working principle of the MBR is based on electromagnetic induction laws, according to which the braking of a conductor moving in the magnetic field is caused by the interaction of the conductor's eddy currents with the external magnetic field. In the paper, a mathematical model of the pallet motion on an MBR was developed. The equation of motion of the pallet on the MBR was derived. The calculation results were compared with the results of experimental studies of the pallet motion velocity on the MBR. For pallet speed under “drag peak” speed, the error of the mathematical model is <7.7%, and the error starts increasing once over the “drag peak” speed. Additional investigation of the coefficient of magnetic viscosity for speeds greater than the “drag peak” speed is required.

Źródło:

Acta Mechanica et Automatica; 2022, 16, 1; 34--39
1898-4088
2300-5319

Pojawia się w:

Acta Mechanica et Automatica

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 63.

Tytuł:

An innovative methodology for recycling iron from magnetic preconcentrate of an iron ore tailing

Autorzy:

Yu, J.
Han, Y.
Gao, P.
Li, Y.
Yuan, S.
Li, W.

Powiązania:

https://bibliotekanauki.pl/articles/110888.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

magnetic preconcentrate
iron ore tailing
iron recycling
fluidized magnetization roasting
magnetic separation

Opis:

Iron ore tailing is a kind of hazardous solid waste produced by iron and steel industry. In order to separate and recycle iron from the magnetic preconcentrate of an iron ore tailing, an innovative technological route of fluidized magnetization roasting followed by low-intensity magnetic separation was proposed in this paper. The effects of roasting temperature, dosages of reducing gas CO and fluidizing gas N2 on recovery rate of iron were carried out and optimized. The results showed that the hematite was almost reduced to magnetite by a gas mixture of 4 m3/h CO and 1 m3/h N2 at roasting temperature of 540 °C. Under the optimized conditions, a magnetic concentrate assaying 61.4 wt% Fe with a recovery rate of 81.8% was obtained from the magnetic preconcentrate of an iron ore tailing. The iron chemical phase, X-ray diffraction (XRD), and optical metallographic microscope analyses revealed that siderite was converted to magnetite successfully after roasting, and some coarse magnetite-hematite interlocking particles were formed due to insufficient reaction time, which could also be recovered by magnetic separation after liberating from gangue minerals.

Źródło:

Physicochemical Problems of Mineral Processing; 2018, 54, 3; 668-676
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 64.

Tytuł:

Possibile Applications of Magnetic Microwires in Aviation

Autorzy:

Draganová, K.
Blažek, J.
Praslička, D.
Kmec, F.

Powiązania:

https://bibliotekanauki.pl/articles/97841.pdf

Data publikacji:

2013

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Lotnictwa

Tematy:

aviation
magnetic microwires sensors
magnetic field sensors
mechanical stress sensors
temperature sensors

Opis:

Magnetic microwires have been rediscovered due to a number of the unusual magnetic properties and their potential applications. The paper concerns glass-coated magnetic microwires composed of a ferromagnetic metallic core with a diameter of 0.6 – 30 μm and of a glass coat with a thickness of 2 – 20 μm. The fabrication process and magnetic properties of these microwires are described. Due to their unique properties microwires can be used as a sensing element of sensors. Microwire-based sensors can be used in a wide range of aviation applications as magnetic field sensors, tensile stress sensors or temperature sensors. The main advantages of microwire-based sensors are associated with their small dimensions and weight, which play a very important role in aviation.

Źródło:

Fatigue of Aircraft Structures; 2013, 5; 12-17
2081-7738
2300-7591

Pojawia się w:

Fatigue of Aircraft Structures

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 65.

Tytuł:

Electric and magnetic field of different transpositions of overhead power line

Autorzy:

Deltuva, R.
Lukočius, R.

Powiązania:

https://bibliotekanauki.pl/articles/140665.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

electric and magnetic field strength
linear charge density
electric and magnetic
flux density
electric and magnetic field, power line
transposition

Opis:

In Lithuanian and Polish electric power supply systems, the power transmission lines of 400 kV voltage represent one of the most potential sources of electric and magnetic fields generation. The 400 kV double-circuit overhead power transmission line and its surrounding environment were herby described and simulated through Finite Element Method using COMSOL Multiphysic software package. This study includes magnetic and electric field calculations. The study shows that the values of magnetic field strength and electric field strength present in the vicinity of a 400 kV overhead power transmission line tend to exceed limit values established in the Normative. Measurements are suggested to be taken for the purpose of finding maximum values of magnetic and electric field strength. To reduce these values, it is recommended to increase the height of supports, and restrict human personal and economic activities.

Źródło:

Archives of Electrical Engineering; 2017, 66, 3; 595-605
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 66.

Tytuł:

Wielowariantowa analiza pola magnetycznego i obliczenie sił lewitacji aktywnego osiowego łożyska magnetycznego (AAMB)
Multivariate magnetic field analysis and levitation force calculation of the active axial magnetic bearing (AAMB)

Autorzy:

Graca, P.
Tomczuk, B.

Powiązania:

https://bibliotekanauki.pl/articles/408408.pdf

Data publikacji:

2014

Wydawca:

Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej

Tematy:

łożysko magnetyczne
pole magnetyczne
siła magnetyczna
metoda elementów skończonych
analiza
magnetic bearing
magnetic field analysis
finite-element method
magnetic force

Opis:

W artykule przedstawiono wielowariantowe obliczenia pola i siły magnetycznej siłownika aktywnego osiowego łożyska magnetycznego (AAMB). Wykonano model polowy oparty na Metodzie Elementów Skończonych (MES), który pozwolił na analizę konstrukcji AAMB. W wyniku wielowariantowych obliczeń określono najkorzystniejsze wymiary tarczy łożyska dla założonych wymiarów elektromagnesu.
The paper presents multivariate calculations of magnetic field and magnetic force in the active axial magnetic bearing actuator (AAMB). The field model has been developed using Finite Element Method (FEM) and has been used for AAMB construction analysis. As a result of multivariate calculations the beneficial dimensions of a bearing disk were determined, where the electromagnet dimensions were used as a reference.

Źródło:

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2014, 4; 109-112
2083-0157
2391-6761

Pojawia się w:

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 67.

Tytuł:

Effect of the magnetic particles concentration on the ferro-oil’s dynamic viscosity in presence of an external magnetic field in the aspect of temperature changes

Autorzy:

Czaban, A.
Frycz, M.
Horak, W.

Powiązania:

https://bibliotekanauki.pl/articles/247080.pdf

Data publikacji:

2013

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

ferro-oil
dynamic viscosity
magnetic particles concentration
temperature changes
external magnetic field

Opis:

There is presented an effect of the changes of the concentration of magnetic particles included in the ferro-oil on its dynamic viscosity in the presence of external magnetic field in this paper. The study was conducted in the context of temperature’s changes. The authors assume that the concentration of magnetic particles in ferro-oil can significantly affects its basic physical properties as dynamic viscosity, as well as the operational properties of journal sliding bearings ferro-oil’s lubricated. The equally significant as the above mentioned properties may affect the external environmental conditions of operation, especially temperature changes. In this context, an important technique’s issue appears to determine the principles of selection of optimal concentration of above mentioned particles according to the existing environmental conditions of its operation, or the expectations laid against the operation of the devices. Rheological studies were carried out on Physica MCR 301 rheometer in the “plate-to-plate” measurement system with an adapter to magneto-rheological studies MRD 180/1T. Thermal stabilization was carried out by a water jacket in a closed chamber and controlling the nature of the magnetic field was conducted by current’s changes. Tests were performed for four selected temperature range of 60º, 70º, 80º and 90ºC as regards changes an external magnetic field intensity 0-700 mT. The selected concentrations of magnetic particles in a ferro-oil were 1, 2, 4, 6 and 8%.

Źródło:

Journal of KONES; 2013, 20, 2; 55-60
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 68.

Tytuł:

Study of lone working magnetic resonance technologists in Western Australia

Autorzy:

Dewland, Tracy A.
Hancock, Lauren N.
Sargeant, Simone
Bailey, Rebecca K.
Sarginson, Rodger A.
Cheung Ng, Curtise K.

Powiązania:

https://bibliotekanauki.pl/articles/2179060.pdf

Data publikacji:

2013-12-01

Wydawca:

Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi

Tematy:

Australia
lone working
magnetic resonance imaging safety
magnetic resonance technologist
occupational health

Opis:

Objectives: It is recommended that magnetic resonance (MR) technologists should not work alone due to potential occupational health risks although lone working is legally acceptable. The objective of this study was to investigate the current situation of lone working MR technologists in Western Australia (WA) and any issue against the regulations. Materials and Methods: A questionnaire regarding the issues of occupational health of lone working MR technologists was developed based on relevant literature and distributed to WA MR technologists. Descriptive (percentage of frequency, mean and standard deviation) and inferential statistics (Fisher's exact, Chi² and t tests, and analysis of variance) were used to analyze the responses of the yes/no, multiple choice and 5 pt scale questions from the returned questionnaires. Results: The questionnaire response rate was 65.6% (59/90). It was found that about half of the MR technologists (45.8%, 27/59) experienced lone working. The private magnetic resonance imaging (MRI) centers were more likely to arrange technologists to work alone (p < 0.05). The respondents expressed positive views on issues of adequacy of training and arrangement, confidence and comfort towards lone working except immediate assistance for emergency (mean: 3). Factors of existence of MRI safety officer (p < 0.05) and nature of lone working (p < 0.001-0.05) affected MR technologists' concerns. Conclusions: Lone working of MR technologists is common in WA especially in private centers. The training and arrangement provided seem to be adequate for meeting the legal requirements. However, several areas should be improved by the workplaces including enhancement on immediate emergency assistance and concern relief.

Źródło:

International Journal of Occupational Medicine and Environmental Health; 2013, 26, 6; 837-845
1232-1087
1896-494X

Pojawia się w:

International Journal of Occupational Medicine and Environmental Health

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 69.

Tytuł:

Treatment of potato tubers before planting in a magnetic field

Autorzy:

Sinyavsky, A.
Savchenko, V.

Powiązania:

https://bibliotekanauki.pl/articles/410889.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Oddział w Lublinie PAN

Tematy:

pole magnetyczne
indukcja magnetyczna
bioelektromagnetyzm
bulwa ziemniaka
przenośniki
magnetic field
magnetic treatment of potatoes
magnetic induction
speed of the conveyor
biopotential

Opis:

The results of research on the impact parameters of treatment of potato tubers in a magnetic field to change their biopotential and yield are presented. The optimum regimes of treatment were determined.

Źródło:

ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2012, 1, 2; 49-52
2084-5715

Pojawia się w:

ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 70.

Tytuł:

Model of magnetic gun with respecting eddy currents

Autorzy:

Leubner, K.
Doležel, I.
Laga, R.

Powiązania:

https://bibliotekanauki.pl/articles/97545.pdf

Data publikacji:

2015

Wydawca:

Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej

Tematy:

magnetic gun
magnetic field
numerical solution
higher-order finite element method
coupled problem

Opis:

A sophisticated mathematical model of the magnetic gun is presented and solved numerically. The model consists of three strongly non-linear and non-stationary differential equations describing the time-dependent distribution of magnetic field in the device, current in the field circuit and movement of the projectile. The numerical solution is carried out in the application Agros2D based on a fully adaptive higher-order finite element method. The results are processed in Wolfram Mathematica. The methodology is illustrated with an example and selected results are compared with experiment.

Źródło:

Computer Applications in Electrical Engineering; 2015, 13; 12-20
1508-4248

Pojawia się w:

Computer Applications in Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 71.

Tytuł:

Numerical model of the axial magnetic bearing with six cylindrical poles

Autorzy:

Sikora, Bartłomiej Marian
Pilat, Adam Krzysztof

Powiązania:

https://bibliotekanauki.pl/articles/141281.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Active Magnetic Bearing
Axial Magnetic Bearing
Finite Element Method
numerical model
COMSOL Multiphysics

Opis:

The paper presents a numerical model of the novel design of the axial magnetic bearing with six cylindrical poles. The motivation behind this idea was to eliminate vibra- tions in rotating machinery due to the axial load. Common conception of such a bearing provides a single component of the electromagnetic force, which is not enough to reduce transverse and lateral vibrations of the armature. The proposed design allows for avoiding wobbling of the disc with the use of a few axial force components that are able to actively compensate the axial load and stabilise the disc in a balanced position. Before a real device is manufactured, a virtual prototype should be prepared. The accurate numerical model will provide essential knowledge about the performance of the axial magnetic bearing.

Źródło:

Archives of Electrical Engineering; 2019, 68, 1; 195-208
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 72.

Tytuł:

The influence of Helmholtz and Golay coil homogenity on rectangular plate bending

Autorzy:

Kędzia, Piotr
Kosma, Zbigniew

Powiązania:

https://bibliotekanauki.pl/articles/1954616.pdf

Data publikacji:

2020

Wydawca:

Politechnika Gdańska

Tematy:

composite plate
magnetic field
ferrofluid
magnetic coils
płyta kompozytowa
pole magnetyczne
cewka magnetyczna

Opis:

The subject of the paper is a rectangular plate. The structure of the plate issymmetrical. The plate is made of a cellular structure of a core and two external faces. There isferrofluid in each cell of the porous core. The core is made of polyethylene foam and two facesare polyurethane sheets. It is assumed that cells in the core are regular and dense and the facesare thin, therefore, a plate filled in with ferrofluid can be treated as homogeneous. The plateis placed in the magnetic field. The magnetic field is generated by two systems of coils – theHelmholtz coil (HC ) and the Golay coil (GC). The former generates an almost fixed magneticfield in the considered volume (where the plate is placed), and the latter generates a gradientmagnetic field. The changing size of each subsystem of magnetic field coils, the distribution andstrength of the magnetic field change as well. The magnetic field induces loads in the plate,both perpendicular and in plane. The plate bending function is approximated by the bicubicspline function presented by normalized B-spline functions. The influence of changes in thehomogeneity volume and the magnetic field strength (by changing the coil size) on the platebending is analyzed in the paper. The results of the analysis are presented in tables and figures.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2020, 24, 1; 5-16
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 73.

Tytuł:

Wpływ zastosowania różnego rodzaju osnowy w materiałach kompozytowych na ich właściwości magnetyczne
The influence of using various type of binders in composite materials to their magnetic properties

Autorzy:

Jakubas, A.
Dąbrowski, R.

Powiązania:

https://bibliotekanauki.pl/articles/267631.pdf

Data publikacji:

2018

Wydawca:

Politechnika Gdańska. Wydział Elektrotechniki i Automatyki

Tematy:

histereza
kompozyty miękkie magnetycznie
właściwości magnetyczne
Soft Magnetic Composites
magnetic properties
processing
measurements

Opis:

W pracy przeprowadzono analizę wpływu materiału osnowy na właściwości magnetyczne miękkich materiałów kompozytowych (SMC). Badania przeprowadzono na próbkach rdzeni cylindrycznych wykonanych przez autorów z mieszaniny proszku żelaza i różnego rodzaju osnowy. Badania obejmowały wyznaczenie takich parametrów jak indukcja nasycenia Bs, natężenie koercji Hc i stratność. Pomiary wykonano przy różnej częstotliwości wymuszenia.
Soft magnetic composites are often used in the design of electromagnetic converters and electrical machines. Their popularity is due to the ease of molding and the ability to adapt to specific applications. The paper presents magnetic properties of cores made of iron powder and different type of binder. Samples were prepared by compression in temperature dependent from binder / Fe powder mix. Measurement of magnetic parameters revealed an change in magnetic properties with using various types of binders. The presented measurement data show that it is possible to produce of SMC cores with good magnetic properties, using readily available components and in uncomplicated production processes. Cylindrical cores were made with different types of binders, respectively: powder of suspense polyvinyl chloride, powder of polytetrafluoroethylene, powder of polyethylene wax and transformer oil. For the prepared samples we have determined their basic magnetic properties. The analysis of collected measurement data showed a significant relationship between SMC sample forming parameters and their magnetic properties. In addition, the measurements showed a poor dependence of the magnetic properties in developed SMC samples on the excitation frequency. The method of producing a polymer-metal composite described in the article is the subject of patent application P.420850.

Źródło:

Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2018, 59; 65-68
1425-5766
2353-1290

Pojawia się w:

Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 74.

Tytuł:

Advances in Powder Metallurgy Soft Magnetic Composite Materials

Autorzy:

Bureš, R.
Strečková, M.
Fáberová, M.
Kollár, P.
Füzer, J.

Powiązania:

https://bibliotekanauki.pl/articles/353238.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

resin bonded SMC
soft magnetic ferrites
compaction
microwave sintering
magnetic and mechanical properties

Opis:

Powder metallurgy has grown with the expansion of various industry. Automotive industry had the most strong influence. Today, more than 90% of PM products are used in the transportation industry. Development of new materials such as magnetic materials is expected to meet the new trends of automotive industry, electric and hybrid vehicles. Soft magnetic composites (SMC) are PM materials based on ferromagnetic powder particles covered by electric insulation layer. Concept of SMC’s and PM technologies offer possibility to become faster, use higher frequencies, become smaller and denser, save more energy, achieving high permeability and lower core loss in high frequency region, which is required for soft magnetic materials. Investigation of correlations among compaction parameters, inner structure, magnetic and mechanical properties are presented.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 2B; 1149-1154
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 75.

Tytuł:

Measures to reduce the residual field and field gradient inside a magnetically shielded room by a factor of more than 10

Autorzy:

Voigt, J.
Knappe-Grüneberg, S.
Schnabel, A.
Körber, R.
Burghoff, M.

Powiązania:

https://bibliotekanauki.pl/articles/220358.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

magnetic shielding
magnetic shielded room
msr
residual field
residual field gradient
degaussing
demagnetization

Opis:

Very low residual magnetic field and field gradients are essential for a number of high resolution fundamental physical experiments and for further improvement of very sensitive magnetic measurement devices. The scope ranges from spin precession experiments, e.g. with ³He or neutrons, to biomagnetic measurements, like magnetoencephalograms, and to low field MR spectroscopy. One method of reducing environmental magnetic noise is to use a magnetically shielded room (MSR). Here, measures are demonstrated to improve residual field and field gradient inside a common MSR by a factor of more than 10 by a specific degaussing procedure, material selection of prefabricated parts and active shielding. The process is independent of the shielding factor and works also properly for heavily shielded rooms.

Źródło:

Metrology and Measurement Systems; 2013, 20, 2; 237-248
0860-8229

Pojawia się w:

Metrology and Measurement Systems

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 76.

Tytuł:

Issues involved in using the direct method for magnetic field strength measurement of electrical steel sheets – review
Problemy pomiaru natężenia pola magnetycznego blach elektrotechnicznych metodą bezpośrednią – przegląd

Autorzy:

Gaworska-Koniarek, D.
Bajorek, J.
Wilczyński, W.

Powiązania:

https://bibliotekanauki.pl/articles/159080.pdf

Data publikacji:

2016

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki

Tematy:

pomiar natężenia pola magnetycznego
czujniki pola magnetycznego
metoda bezpośrednia
magnetic field strength measurements
magnetic field sensor
magnetic field measurement
direct method

Opis:

W artykule, na podstawie dokonanego przeglądu literatury, przedstawiono istniejące problemy pomiaru natężenia pola magnetycznego metodą pośrednią i bezpośrednią w blachach elektrotech-nicznych oraz próby ich rozwiązania. Opisano czujniki składowej natężenia pola magnetycznego stosowane najczęściej do pomiaru natężenia pola magnetycznego w blachach elektrotechnicznych.
The paper presents, based on a review of relevant literature, the existing problems of magnetic field strength measurements of electrical steel sheets by means of the indirect and direct methods. It also describes some attempts to solve these problems. The magnetic field strength sensors most widely used for testing electrical steel sheets are also discussed.

Źródło:

Prace Instytutu Elektrotechniki; 2016, 274; 71-82
0032-6216

Pojawia się w:

Prace Instytutu Elektrotechniki

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 77.

Tytuł:

Potential of low concentration nanofluids in heat transfer

Autorzy:

Roszko, A.
Fornalik-Wajs, E.

Powiązania:

https://bibliotekanauki.pl/articles/105971.pdf

Data publikacji:

2015

Wydawca:

Centrum Badań i Innowacji Pro-Akademia

Tematy:

weakly-magnetic nanofluid
heat transfer phenomena
strong magnetic field
thermo-magnetic convection
zjawisko wymiany ciepła
silne pole magnetyczne
konwekcja termo-magnetyczna

Opis:

The main purpose of conducted studies was recognition of low concentration nanofluid under the influence of magnetic field potential applications. The investigations are having fundamental character but Authors keep in mind better energy utilization through the heat transfer enhancement. The examined fluid was composed of water and Cu/CuO nanoparticles. Three temperature differences were imposed on the system. The results did not give unequivocal answer on possible utilization of studied phenomena, but there is open scene for the studies of particle-fluid interaction and flow structure. The main conclusion is that the magnetic properties of base fluid and particles are crucial for such analysis.

Źródło:

Acta Innovations; 2015, 16; 48-55
2300-5599

Pojawia się w:

Acta Innovations

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 78.

Tytuł:

Stability test of Hyperloop vehicle in different movement conditions

Autorzy:

Kowalik, Rafał
Kisilowski, Jerzy
Łusiak, Tomasz
Gil, Leszek

Powiązania:

https://bibliotekanauki.pl/articles/27312782.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

stability
hyperloop vehicle
magnetic levitation

Opis:

The guide of the Hyperloop system in the paper is mathematically represented as a continuous system along which the force from the capsule travels, with the capsule in turn represented as a discrete system. The simulations discussed in the article were used to determine the displacements of the magnet elements. ANSYS software was used to perform the simulations using finite element calculations (FEM). The stability of the capsule will be determined from the results of the displacements present in the system. Taking into account the existing conditions in the magnet and guide assembly system, the simulation results were used to analyse stability in technical and stochastic terms (Lyapunov criteria) for non-linear systems. In the technical stochastic stability analysis, the transverse displacements of the electromagnets were used. The probability of unstable Hyperloop motion was then calculated.

Źródło:

Eksploatacja i Niezawodność; 2023, 25, 3; art. no. 169204
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 79.

Tytuł:

Illustration of the elliptical field in the screened flat 3-phase high current busduct

Autorzy:

Kusiak, D.
Piątek, Z.
Szczegielniak, T.

Powiązania:

https://bibliotekanauki.pl/articles/97732.pdf

Data publikacji:

2012

Wydawca:

Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej

Tematy:

high-current busduct
magnetic fields

Opis:

The paper demonstrates the elliptical magnetic field in the flat 3-phase high current screened busduct in the context of the both the external and internal proximity effect. The modules and the amplitudes of the complex components of the magnetic field strength in the high-current busducts of this type are the functions of the two variables: r and Ѳ of the cylindrical coordinate system which subsequently provokes to the conclusion that the harmonic magnetic field in shielded high-current busducts is a rotating elliptical field. For the characterisation of complex vector values for this field, it is suggested that the length of the longer semi axis of an ellipse as showed at the end of the vector within one period should be used. The article presents the elliptic magnetic field in the screen, and the internal and external area of the screen of the flat 3-phase high current busduct.

Źródło:

Computer Applications in Electrical Engineering; 2012, 10; 80-97
1508-4248

Pojawia się w:

Computer Applications in Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 80.

Tytuł:

Higher order reversal curves in some hysteresis models

Autorzy:

Chwastek, K.

Powiązania:

https://bibliotekanauki.pl/articles/140836.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

soft magnetic materials
hysteresis
modelling

Opis:

Some physical concepts important for a hysteresis model (effective field, anhysteretic magnetization) are discussed on the example of Jiles-Atherton model. The Jiles-Atherton model reveals some drawbacks, which make this model more difficult to be applied in electrical engineering. In particular, it does not describe accurately the magnetization curves after a reversal, moreover complex magnetization cycles are poorly represented. On the other hand, the phenomenological description proposed by Takács seems to be a valuable alternative to the Jiles-Atherton formalism. The concept of effective field may be easily incorporated in the description.

Źródło:

Archives of Electrical Engineering; 2012, 61, 4; 455-470
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 81.

Tytuł:

Pollution Determined by Using Magnetic Susceptibility Measurements: A Case Study from İzmir-Aliağa

Autorzy:

Kamaci, Z.
Uysal, G.

Powiązania:

https://bibliotekanauki.pl/articles/1031417.pdf

Data publikacji:

2017-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

environmental geophysics
pollution
magnetic susceptibility

Opis:

Wherever industrial development exists, environmental pollution increases day by day. The heavy metals play an important role in soil and environmental pollutions and directly affect the human being lives. In this study, we determine pollutions resulting from heavy metal particles emanating from the brake discs pads of the vehicles on high ways and nearby factories. The field work was carried out in İzmir-Aliağa industrial area. Magnetic susceptibility measurements were done at a long profile crossing the İzmir-Çanakkale highway that goes through the study area. Here, we have determined the effect of heavy metals causing pollution in the surroundings. The studies indicate that the average acceptable values of magnetic susceptibility in such areas is about 0-50×10¯⁵ SI. Here we show that the magnetic susceptibility measurement values obtained along our study profile are about 18 times the acceptable ranges.

Źródło:

Acta Physica Polonica A; 2017, 132, 3; 487-489
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 82.

Tytuł:

Magnetic field of a radial tire after puncture caused by ferromagnetic elements

Autorzy:

Szegda, A.
Radkowski, S.
Brol, S.

Powiązania:

https://bibliotekanauki.pl/articles/298281.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie

Tematy:

magnetic profile
tire
ferromagnetic penetrator

Opis:

Tire, an element of wheel, is made in a sophisticated vulcanization process of many components and some of which such as: bead wire, belt and carcass exhibit ferromagnetic properties. Such components create variable in direction and intensity magnetic field, which expands around tire and the complete wheel. Since the layout of magnetic field is exceptional for every single wheel many of information might be obtained on the basis of it alteration. The reported since now application concentrates on rotational speed measurement, wheel rotations counting and therefore also vehicle linear speed and distance estimation. However up to the present the known solutions did not describe changes in magnetic field in case of damage induced by e.g. puncture caused by ferromagnetic elements. This paper’s aim is to test the thesis that it is possible to detect puncture in tire made by ferromagnetic element by using measurement and analysis of changes of magnetic flux density around tire. The tests were executed using original measuring device, designed especially for such experiments. It registers a magnetic profile, which consists of data series of magnetic flux density measured in this investigations 55 mm above tire’s tread and arranged along with rotation angle. Tire magnetic properties were assessed by using of circumferential magnetic profiles and parameters such as: minimum value (M_min), maximum value (M_max), peak to peak value (M_m), average value of ordinates of profile (M_b), skewness of ordinate distribution (M_s) and kurtosis of ordinate distribution (M_k). Magnetic profiles before after puncture were analysed as well as the parameters. Moreover differential signal caused by puncture were determined. It turned out that detected changes are directly related to tire damage and showing in rotation angle where puncture occurs.

Źródło:

Technical Sciences / University of Warmia and Mazury in Olsztyn; 2018, 21(3); 183-194
1505-4675
2083-4527

Pojawia się w:

Technical Sciences / University of Warmia and Mazury in Olsztyn

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 83.

Tytuł:

The magnetic susceptibility of soils and alluvial sediments from Gdansk region (northern Poland)

Autorzy:

Nawrocki, J.
Lis, J.
Grabowski, J.
Pasieczna, A.

Powiązania:

https://bibliotekanauki.pl/articles/2059451.pdf

Data publikacji:

2000

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

Gdańsk region
magnetic susceptibility
pollution

Opis:

Volume magnetic susceptibility of soils and alluvial sediments from the eastern Pomeranian region near Gdańsk was investigated. Full set of geochemical analyses had been previously performed for all the samples studied. The results are presented in the form of the susceptibility maps of the topsoil horizon, the subsoil at the depth between 40 and 60 cm and the alluvial sediments. Additionally the differential susceptibility map between topsoil horizon and the subsoil at the depth 40-60 cm has been also constructed. A close correlation is observed between positive anomalies of differential susceptibility and urban areas. This is interpreted as surface anthropogenic pollution. Magnetic susceptibility values higher than 1200 x 10-6 SI units, observed in topsoil horizon, might reflect high contents of such elements as Ba, Co, Mg, Mn and Ni.

Źródło:

Geological Quarterly; 2000, 44, 3; 341-345
1641-7291

Pojawia się w:

Geological Quarterly

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 84.

Tytuł:

Flow patterns generated by a strong magnetic field
Wpływ silnego pola magnetycznego na strukturę przepływu

Autorzy:

Fornalik, E.

Powiązania:

https://bibliotekanauki.pl/articles/279226.pdf

Data publikacji:

2007

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

spoke pattern
thermosyphon
magnetic field

Opis:

The influence of a strong magnetic field on a paramagnetic fluid in a cylindrical enclosure of thermosyphon-like geometry was studied. A variety of spoke patterns was experimentally obtained and recorded. The analysis led to some data about the temperature field and, indirectly, about the flow structure. The results related to the heat transfer rate confirmed the conclusions coming from the flow visualization.
Przedstawione zostały badania dotyczące struktury przepływu w geometrii cylindrycznej typu odwrócony termosyfon (tzn. górna część cylindra była grzana, a dolna chłodzona). Naczynie eksperymentalne napełnione cieczą paramagnetyczną zostało umieszczone w przestrzeni badawczej magnesu nadprzewodzącego, generującego silne pole magnetyczne (maksymalna indukcja magnetyczna 5 Tesli). Badano wpływ pola magnetycznego na strukturę przepływu, dokonano wizualizacji pola temperatury przy pomocy ciekłych kryształów oraz pomiaru temperatury za pomocą termopar. Bez pola magnetycznego oraz dla indukcji magnetycznej poniżej 1 Tesli w naczyniu nie obserwowano ruchu konwekcyjnego, a co za tym idzie również żadnej struktury przepływu. Dla indukcji magnetycznej powyżej 1 Tesli w naczyniu eksperymentalnym została zapoczątkowana konwekcja magnetyczna, co objawiło się pojawieniem struktury szprychowej. Struktura szprychowa, typowa dla konwekcji naturalnej w termosyfonie (tzn. górna część cylindra chłodzona, a dolna grzana) uległa zmianie - wraz ze wzrostem indukcji magnetycznej wzrastała liczba płatków, co sugerowało intensyfikację konwekcji. Wyniki wizualizacji zostały potwierdzone przez pomiary termiczne oraz wyznaczoną liczbę Nusselta.

Źródło:

Journal of Theoretical and Applied Mechanics; 2007, 45, 3; 557-568
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 85.

Tytuł:

Application of magnetovision for detection of dangerous objects

Autorzy:

Nowicki, M.
Szewczyk, R.

Powiązania:

https://bibliotekanauki.pl/articles/385177.pdf

Data publikacji:

2013

Wydawca:

Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów

Tematy:

magnetovision
magnetoresistive sensors
magnetic imaging

Opis:

Paper presents application of magnetovision in weak magnetic fields for public security systems. Measurement system was developed to study the magnetic field vector distributions. The measurements of the Earth’s field disturbances caused by ferromagnetic objects were carried out. The ability for passive detection of selected dangerous objects and determine their location was demonstrated.

Źródło:

Journal of Automation Mobile Robotics and Intelligent Systems; 2013, 7, 2; 70-74
1897-8649
2080-2145

Pojawia się w:

Journal of Automation Mobile Robotics and Intelligent Systems

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 86.

Tytuł:

Testing of the three axis magnetometers for measurements of the earths magnetic field

Autorzy:

Szewczyk, R.
Salach, J.
Bieńkowski, A.

Powiązania:

https://bibliotekanauki.pl/articles/385198.pdf

Data publikacji:

2009

Wydawca:

Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów

Tematy:

magnetic sensors
Helmholtz coils
calibration

Opis:

The paper presents experimental setup for testing of the three axis magnetoresisitive magnetometers for measurements of the magnetic field within the range of Earth's magnetic field. Measuring setup integrates three axis Helmholtz coils controlled by the specialized current source. The accuracy of magnetic field generated by the Helmholtz coils is up to 0.6% for the one direction. Presented experimental setup can be also applied for investigation and calibration of the other magnetometers utilizing magnetoresistive, Hall or fluxgate sensors.

Źródło:

Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 96-98
1897-8649
2080-2145

Pojawia się w:

Journal of Automation Mobile Robotics and Intelligent Systems

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 87.

Tytuł:

Magnetic texture determination by CEMS with polarized radiation

Autorzy:

Olszewski, K.
Szymański, K.
Satuła, D.
Dobrzyński, L.

Powiązania:

https://bibliotekanauki.pl/articles/148215.pdf

Data publikacji:

2007

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

magnetic texture
CEMS
polarized radiation

Opis:

CEMS measurements of a 57Fe foil were performed with unpolarized and polarized radiation. It is shown that the experimental results permit determination of important characteristics of a magnetic texture, an average square of the cosine((gamma-m)2) and an average cosine (gamma-m).

Źródło:

Nukleonika; 2007, 52, supl. 1; 17-19
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 88.

Tytuł:

Purification of halloysite by magnetic separation

Autorzy:

Sakiewicz, P.
Lutynski, M.
Soltys, J.
Pytlinski, A.

Powiązania:

https://bibliotekanauki.pl/articles/110768.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

halloysite
magnetic separation
HCl treatment

Opis:

Rational use of mineral resources requires advanced separation methods in order to obtain high quality products. In this study chemical treatment with magnetic separation of halloysite from Dunino (Poland) is presented. Initial crushing, hydrochloric acid absorption treatment, sedimentation (settling) and polygradient magnetic separation in weak magnetic field were applied to separate aluminosilicates from iron and titanium oxides (impurities). The process allowed to obtain a product of approximately 98% purity of the aluminosilicate fraction (halloysite + kaolinite). The tailings from magnetic separation consisted of iron oxides, while the intermediate product consisted mainly of aluminosilicate and iron chlorides resulting from the HCl treatment. The obtained products can be used as a component of polymer nanocomposites, sorbents and in ceramics industry.

Źródło:

Physicochemical Problems of Mineral Processing; 2016, 52, 2; 991-1001
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 89.

Tytuł:

High Efficient Photocatalytic Degradation of Methyl Orange Dye in an Aqueous Solution by $CoFe_2O_4-SiO_2-TiO_2$ Magnetic Catalyst

Autorzy:

Hariani, Poedji Loekitowati
Said, Muhammad
Salni, -
Aprianti, Nabila
Naibaho, Yohanna Asina Lasma Rohana

Powiązania:

https://bibliotekanauki.pl/articles/2025485.pdf

Data publikacji:

2021

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

magnetic
degradation
photocatalytic
methyl orange

Opis:

This study successfully synthesized a core-shell-shell in the form of $CoFe_2O_4-SiO_2-TiO_2$ catalyst magnetic and recyclable. The catalyst was employed for the photocatalytic degradation of methyl orange (MO) dye. Subsequently, the catalyst was subjected to XRD, FTIR, SEM-EDS, VSM, as well as UV-DRS characterizations. The photocatalytic degradation was studied as a function of the solution pH, MO concentration, and irradiation time, while the kinetics of photocatalytic degradation and the catalyst reusability were also evaluated. On the basis of the XRD, FTIR, and SEM-EDS characterizations, the $CoFe_2O_4$ coating was successfully carried out using $SiO_2$ and $TiO_2$. $CoFe_2O_4-SiO_2-TiO_2$ was discovered to possess magnetic properties with a saturation magnetization of 17.59 emu/g and a bandgap value of 2.4 eV. The photocatalytic degradation of MO followed the Langmuir-Hishelwood model. The optimum degradation was obtained at the MO concentration of 25 mg/L, solution pH of 4, catalyst dose of 0.05 g/L, irradiation time of 160 minutes, MO removal efficiency achieved 93.46%. The regeneration study showed $CoFe_2O_4-SiO_2-TiO_2$ after 5 cycles were able to catalyze the photocatalytic degradation with an MO removal efficiency of 89.96%.

Źródło:

Journal of Ecological Engineering; 2022, 23, 1; 118-128
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 90.

Tytuł:

Model of magnetic gun with respecting eddy currents

Autorzy:

Leubner, K.
Doležel, I.
Laga, R.

Powiązania:

https://bibliotekanauki.pl/articles/377730.pdf

Data publikacji:

2015

Wydawca:

Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej

Tematy:

magnetic gun
magnetic field
numerical solution
higher-order finite element method
coupled problem

Opis:

A sophisticated mathematical model of the magnetic gun is presented and solved numerically. The model consists of three strongly non-linear and non-stationary differential equations describing the time-dependent distribution of magnetic field in the device, current in the field circuit and movement of the projectile. The numerical solution is carried out in the application Agros2D based on a fully adaptive higher-order finite element method. The results are processed in Wolfram Mathematica. The methodology is illustrated by an example and selected results are compared with experiment.

Źródło:

Poznan University of Technology Academic Journals. Electrical Engineering; 2015, 81; 21-29
1897-0737

Pojawia się w:

Poznan University of Technology Academic Journals. Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 91.

Tytuł:

Manganite nanoparticles as promising heat mediators for magnetic hyperthermia: comparison of different chemical substitutions

Autorzy:

Tovstolytkin, A.
Shlapa, Yu.
Solopan, S.
Bodnaruk, A.
Kulyk, M.
Kalita, V.
Zamorskyi, V.
Ryabchenko, S.
Belous, A.

Powiązania:

https://bibliotekanauki.pl/articles/1052905.pdf

Data publikacji:

2018-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

magnetic nanohyperthermia
manganite nanoparticles
complex chemical substitutions
Curie temperature
AC magnetic heating characteristics

Opis:

Magnetostatic properties and AC magnetic heating characteristics of (La,Sr)MnO₃ nanoparticles with substitutions in manganese and lanthanum sublattices have been studied. The nanoparticles with average sizes in the range 25-38 nm were synthesized via sol-gel method. Fe substitution for Mn, as well as Sm substitution for La have been used in the experiment. It is shown that the increase in substitution level (for both Fe and Sm substitutions) results in lowering the Curie temperature T_{C} and weakening heating efficiency under the action of AC magnetic field. The results demonstrate that the action of AC field causes effective heating of nanoparticles at temperatures lower than T_{C}, while heating efficiency becomes strongly reduced at higher temperatures. It is proved experimentally that the substitutions in Mn sublattice result in more rapid changes of magnetic properties, as compared to the substitutions in La one. Thus, complex substitutions based on suitable combinations of substituting elements may serve as an efficient tool to "softly" tune the maximal temperature achieved during the AC magnetic field induced heating of nanoparticles, which is important for application of these materials as heat mediators for self-controlled magnetic nanohyperthermia.

Źródło:

Acta Physica Polonica A; 2018, 133, 4; 1017-1020
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 92.

Tytuł:

The Magnetic Moments of Single-Domain and its Mathematics Formation

Autorzy:

Mezher, Sabah Jameel

Powiązania:

https://bibliotekanauki.pl/articles/1192618.pdf

Data publikacji:

2016

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Magnetic Moments
Single domain
uniaxial particles
rock magnetism
palaeomagnetism
magnetic materials
diverse phenomena

Opis:

We now demonstrate that such "uniaxial" particles can allow several quantifiable stable (or metastable) orientations of the magnetic moment within the same particle. A new model is presented with quantitative predictions verified by experiments. The results have important implications for rock magnetism, palaeomagnetism, and magnetic materials research. Firstly, the new model quantitatively accounts for several previously unexplained diverse phenomena exhibited by such single-domain (SD) particles. Including the acquisition of gyroremanences, tiled-impressed anisotropy, and transverse components of reminisce in individual particles. These phenomena are theoretically impossible in idealized uniaxial single domain particles, and could now be used to quantify the deviation of real particles from ideal behavior. Secondly, deflections of the natural remanence vector and computations of the ancient field vector and paleointensity are not only controlled by the shape and distribution of the particles, but also by the possible stable orientations of the moments within single-domain particles. The model is also relevant to other single-domain particle morphologies.

Źródło:

World Scientific News; 2016, 60; 92-102
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 93.

Tytuł:

Current Highlights in the Use of Magnetic Resonance Spectroscopy in Multiple Sclerosis

Autorzy:

Kulczyński, Marcin
Walicka, Alicja
Marciniec, Michał
Sapko, Klaudia
Dyndor, Katarzyna

Powiązania:

https://bibliotekanauki.pl/articles/1058090.pdf

Data publikacji:

2019

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Multiple sclerosis
N-acetylaspartate
brain metabolites
demyelination
magnetic resonance imaging
magnetic resonance spectroscopy

Opis:

Magnetic resonance spectroscopy is a non-invasive method used to measure concentrations of selected metabolites in brain such as: N-acetylaspartate, creatine, choline, glutamic acid, myo-inositol, lactic acid or γ-aminobutyric acid. The MRS allows the researcher to obtain information about biochemical composition in selected localizations of the examined CNS and is based on the interpretation of spectra of specific chemical compounds. The aim of this study is a literature review of papers from last 5 years involving the use of MRS in multiple sclerosis. Magnetic resonance spectroscopy is a modern, promising metabolomic imaging method enabling the assessment of brain metabolite concentrations and the dynamism of their changes in healthy people and patients suffering from multiple sclerosis at every stage of the disease. MRS is helpful not only in correlating changes in metabolite concentrations at various central nervous system locations with clinical manifestations, but is also an increasingly improving tool for predicting disease progression. Magnetic resonance spectroscopy may also be useful in more specific clinical situations such as differential diagnosis between multiple sclerosis and Devic’s syndrome or between tumefactive demyelinating lesions and gliomas. Especially in the latter case, the development of this technology may in the future result in the possibility of avoiding invasive biopsy in patients during the diagnosis of focal changes in the CNS. One should also not forget about the role that MRS may play in the future in monitoring the course of treatment with modern MS drugs, not only in everyday clinical practice but also at the stage of clinical trials. The development of fast MRS techniques, significantly shortening the acquisition time and 7 T magnetic resonance spectroscopy, precise and repeatable method of quantitative analysis of brain metabolites may be particularly helpful in achieving these goals.

Źródło:

World Scientific News; 2019, 134, 2; 187-197
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 94.

Tytuł:

Effect of magnetic field on the corrosion of iron as studied by positron annihilation

Autorzy:

Pietrzak, R.
Szatanik, R.

Powiązania:

https://bibliotekanauki.pl/articles/146285.pdf

Data publikacji:

2010

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

corrosion
magnetic field
positron annihilation

Opis:

Lifetime spectra of positron annihilation in iron corroded in a water solution of HCl and in vapour above its surface have been investigated with emphasis on the effect of corrosion time and environment (solution or vapour) as well as of the presence and orientation of the magnetic field on the measured positron annihilation parameters. All the registered positron lifetime spectra consist of two components. For corroded samples, the intensities of the two components as well as the corresponding values of the mean positron lifetime, differ from those for uncorroded material. The corrosion-induced changes in the positron annihilation parameters depend on the corrosion environment (solution or vapour) and on the presence and direction of external magnetic field.

Źródło:

Nukleonika; 2010, 55, 1; 31-34
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 95.

Tytuł:

The influence of Co and V substitution on structural properties of FINEMET-type alloys

Autorzy:

Szumiata, T.
Gawroński, M.
Brzózka, K.
Górka, B.
Sovák, P.
Pavlík, P.

Powiązania:

https://bibliotekanauki.pl/articles/148217.pdf

Data publikacji:

2007

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

magnetic texture
CEMS
polarized radiation

Opis:

The effect of addition of Co and V on the hyperfine parameters of amorphous as well as nanocrystalline Finemet-type alloys has been studied by means of transmission Mössbauer spectrometry. It was stated that these elements infiltrate into crystalline grains in the course of crystallization, what causes alteration in structure. Different evolution of magnetic hyperfine field is reported in both cases and analyzed. In the series of alloys substituted by vanadium, the substantial paramagnetic component attributed to iron-poor regions in the amorphous remainder was found.

Źródło:

Nukleonika; 2007, 52, supl. 1; 21-28
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 96.

Tytuł:

Development of a magnetic field monitoring system for the JAERI AVF cyclotron

Autorzy:

Okumura, S.
Arakawa, K.
Fukuda, M.
Nakamura, Y.
Yokota, W.
Ishimoto, T.
Kurashima, S.
Ishibori, I.
Nara, T.
Agematsu, T.
Nakajima, T.

Powiązania:

https://bibliotekanauki.pl/articles/148733.pdf

Data publikacji:

2003

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

compensation coil
cyclotron
magnetic field

Opis:

We have developed a probe of a nuclear magnetic resonance (NMR) magnetometer for measurement of a fluctuation of an AVF cyclotron field. The stability of the magnetic field of the JAERI AVF cyclotron, measured with the NMR probe, was within 1 × 10-5. A field-measurement accuracy of the order of 1 × 10-6 was achieved using a set of field-compensation coils and optimizing the probe position to obtain enough homogeneity of the magnetic field around the probe for measuring the cyclotron field with a high gradient. To eliminate a major bottleneck in the field measurement inside the cyclotron, the probe was specially produced with the cable shielding against RF noises and proper materials applied.

Źródło:

Nukleonika; 2003, 48,suppl.2; 35-37
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 97.

Tytuł:

Magnetic classification of meteorites and application to the Sołtmany fall

Autorzy:

Rochette, P.
Gattacceca, J.
Lewandowski, M.

Powiązania:

https://bibliotekanauki.pl/articles/411478.pdf

Data publikacji:

2012

Wydawca:

Polskie Towarzystwo Meteorytowe

Tematy:

magnetic susceptibility
meteorite classification
Sołtmany

Opis:

We review the use of magnetic susceptibility measurements to classify meteorites, showing that magnetic susceptibility of meteorites vary over 3 orders of magnitude and shows often a narrow range for a given meteorite group, especially in chondrites. Weathering of metal may bias the magnetic classification. For ordinary chondrite falls, the method is quite robust, as shown by its application to the recent Sołtmany fall.

Źródło:

Meteorites; 2012, 2, No. 1-2; 67-71
2299-0313
2299-1220

Pojawia się w:

Meteorites

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 98.

Tytuł:

Mathematical model of radial passive magnetic bearing

Autorzy:

Matuszewski, L.
Falkowski, K.

Powiązania:

https://bibliotekanauki.pl/articles/258724.pdf

Data publikacji:

2010

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

propeller
ring motor
magnetic bearing

Opis:

In the article a mathematical model of radial passive magnetic bearings applicable to ocean engineering units has been presented. The application of the bearings in ship thrusters should increase durability of propulsion systems and give lower maintenance costs. The rotor of thruster’s electric motor is suspended in magnetic field generated by radial passive magnetic bearings. However the maintaining of axial direction of the rotor must be controlled with electromagnets equipped with a high-dynamic controller. The risk of application of the magnetic bearings results from very low stiffness of the unit in comparison with rolling bearings. Also construction of the bearing should be different due to gyroscope effect and high forces generated during ship manoeuvring. The physical model performs correctly if electromagnets are controlled properly; and, technological problem with sealing system seems more significant than power supply to electromagnets winding. The equations presented in the article are necessary to build algorithms of a digital controller intended for on-line controlling magnetic bearing in axial direction.

Źródło:

Polish Maritime Research; 2010, 3; 37-44
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 99.

Tytuł:

Some results of magnetic mapping in the Fuglebergsletta area at the northwest edge of Hornsund Fiord, Spitsbergen

Autorzy:

Koblański, Andrzej

Powiązania:

https://bibliotekanauki.pl/articles/2057286.pdf

Data publikacji:

1985

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Arctic
interpretation of magnetic measurements

Źródło:

Polish Polar Research; 1985, 6, 4; 515-525
0138-0338
2081-8262

Pojawia się w:

Polish Polar Research

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 100.

Tytuł:

The construction and work of magnetic observatory "Arctowski" (King George Island, Sotuh Shetland Islands)

Autorzy:

Szymański, Antoni

Powiązania:

https://bibliotekanauki.pl/articles/2058267.pdf

Data publikacji:

1980

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Antarctic
magnetic observatory
earth magnetism

Źródło:

Polish Polar Research; 1980, 1, 2-3; 105-115
0138-0338
2081-8262

Pojawia się w:

Polish Polar Research

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce