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Tytuł:
Making of ferromagnetic elliptical shell in transverse magnetic field
Autorzy:
Jakubiuk, K.
Wołoszyn, M.
Zimny, P.
Powiązania:
https://bibliotekanauki.pl/articles/377889.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
ferromagnetic object
magnetic field
ferromagnetic shell
Opis:
A ferromagnetic object, located in the Earth’s magnetic field, changes its distribution. Through measuring such disturbances, one can locate the object and destroy it. To conceal the object, a special winding is placed inside its ferromagnetic shell, and its task is to eliminate the disturbances in the distribution of the Earth’s magnetic field. A thin walled elliptical shell, made of ferromagnetic material, is examined as the object model. There are coils, placed inside the shell, and their task is to generate a magnetic field, which is eliminating the effect, the shell is making on the distribution of the Earth’s magnetic field in the surrounding area. Such a procedure is called magnetic masking and the winding used for this purpose is called the masking winding. The possibility of building the masking windings for the ferromagnetic elliptical shell, situated in a transverse magnetic field respectively to its major axis, is also examined. The solution of Maxwell’s equations, which are describing the magnetic field distribution caused by the ferromagnetic shell presence in the Earth’s magnetic field, is found. Furthermore, the ability of selecting coils, which are eliminating the perturbations of the magnetic field outside the shell completely, is proven.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2013, 73; 131-136
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic resonance study of co-modified (Co,N)-TiO2 nanocomposites
Autorzy:
Guskos, N.
Zolnierkiewicz, G.
Guskos, A.
Typek, J.
Berczynski, P.
Dolat, D.
Mozia, S.
Aidinis, C.
Morawski, A. W.
Powiązania:
https://bibliotekanauki.pl/articles/146542.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
nanocomposites
titanium dioxide
ferromagnetic resonance
Opis:
Three nCo,N-TiO2 nanocomposites (where cobalt concentration index n = 1, 5 and 10 wt %) were prepared and investigated by magnetic resonance spectroscopy at room temperature. Ferromagnetic resonance (FMR) lines of magnetic cobalt agglomerated nanoparticle were dominant in all registered spectra. The relaxation processes and magnetic anisotropy of the investigated spin system essentially depended on the concentration of cobalt ions. It is suggested that the samples contained two magnetic types of sublattices forming a strongly correlated spin system. It is suggested that the existence of strongly correlated magnetic system has an essential infl uence of the photocatalytic properties of the studied nanocomposites.
Źródło:
Nukleonika; 2015, 60, No. 3, part 1; 411-416
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
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 (Mmin), maximum value (Mmax), peak to peak value (Mm), average value of ordinates of profile (Mb), skewness of ordinate distribution (Ms) and kurtosis of ordinate distribution (Mk). 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
Artykuł
Tytuł:
Termowizyjna metoda szacowania składników strat w miękkich materiałach ferromagnetycznych
A thermovision method for estimating components of losses in soft ferromagnetic materials
Autorzy:
Gmyrek, Z.
Olbrycht, R.
Więcek, B.
Strąkowska, M.
Tomalczyk, K.
Powiązania:
https://bibliotekanauki.pl/articles/155562.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
straty
ferromagnetyk
termowizja
losses
ferromagnetic
thermovision
Opis:
Artykuł dotyczy wyznaczania składników strat mocy w ferromagnetyku miękkim, wiodącym zmienny w czasie strumień magnetyczny. Autorzy zaproponowali nowe rozwiązanie wykorzystujące kamerę termowizyjną do pomiaru temperatury na powierzchni blachy. Rozwiązanie to bazuje na fakcie, iż rozpraszana energia wynikająca ze strat jest przekształcana w ciepło. Dzięki temu można wyznaczyć składniki strat histerezowych i wiroprądowych wykonując pomiar przy różnych częstotliwościach strumienia magnetycznego.
: The paper presents a novel approach to estimating components of losses in soft ferromagnetic materials. The idea of the described solution is to use a thermovision camera to measure the increase of temperature of the metal plate surface. The temperature rises because of power losses caused by an alternating magnetic flux. This enables measurements at different frequencies to determine the components of the losses. It is required to apply a model of a metal plate [4] to estimate the amount of power, basing on a thermal response recorded by a thermal camera in time domain. Using (4) one can calculate the content of hysteresis and eddy-current losses. The concept of a test rig is shown in Fig. 2, while the obtained results are presented in Fig. 3. In that figure there are plots of power divided by frequency as a function of frequency obtained from thermal measurements and the plots are coherent with those prepared basing on the catalogue data. The results allow us to conclude that the presented method is a promising tool. Currently it is in a preliminary stage and the authors plan to develop it in the future.
Źródło:
Pomiary Automatyka Kontrola; 2013, R. 59, nr 9, 9; 885-887
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ising Model Phase Transition Calculation for Ferro-Paramagnetic Lattice
Autorzy:
Khudier, D. K.
Fawaz, N. I.
Powiązania:
https://bibliotekanauki.pl/articles/412615.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Monte Carlo simulation
magnetic
Ferromagnetic materials
Opis:
The position of the phase transition in the two dimensional Ising model were determined by using Monte Carlo simulation in a quadratic for area of variable length with external magnetic field switched off (B = 0). The magnetization per site , magnetic susceptibility of a ferromagnetic and paramagnetic materials were calculated as a function of temperature for , spin lattice interactions. Nearest neighbor interaction is assumed (i.e. each spin has 4 neighbors); uses periodic boundary conditions. The Curie temperature is determined by measuring the magnetic susceptibility at which the ferromagnetic and paramagnetic undergoes a phase change from order to disorder. There is thus a phase transition defined by the Curie temperature. The Monte Carlo method were used to check these results and to confirm the phase transition. The data are analyzed using the Curie-Weiss law which contains the Curie temperature as a parameter.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 10, 2; 201-212
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of ferromagnetic objects by using scalar magnetometers
Autorzy:
Jakubiuk, K.
Wołoszyn, M.
Powiązania:
https://bibliotekanauki.pl/articles/97481.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
magnetic field
magnetization of ferromagnetic object
measurements of magnetic field
scalar magnetometers
detection of ferromagnetic object
Opis:
The paper presents the results of the analysis of the possibility of detecting ferromagnetic objects (ships, submarines, mines, etc.) by using two scalar magnetometers. By using two magnetometers of high sensitivity (in the order of magnitude of pT/Hz0,5) placed at a distance from each other and operating in a differential system, it is possible to detect ferromagnetic objects from a distance. It is necessary to compensate for the error code to synchronize the work of the two magnetometers. Ferromagnetic object’s detection by using two magnetometers requires proper configuration of the devices.
Źródło:
Computer Applications in Electrical Engineering; 2013, 11; 83-91
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic transformation in Ni-Mn-In Heusler alloy
Autorzy:
Kuzma, M.
Maziarz, W
Stefaniuk, I.
Powiązania:
https://bibliotekanauki.pl/articles/146235.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
ferromagnetic resonance
Heusler alloy
Ni-Mn-In
Opis:
Magnetic properties of a Ni50Mn35.5In14.5 Heusler ribbon were studied by ferromagnetic resonance (FMR) in the temperature range of 335–100 K. In the temperature region of 265–170 K, the FMR signal disappeared, in spite of the fact that this region comprised the main crystal transformation temperatures: Ms, Mf, As, Af. In the austenite crystal state, a weak antiferromagnetic interaction was observed, whereas ferromagnetism was detected in the low temperature martensitic state.
Źródło:
Nukleonika; 2015, 60, No. 3, part 1; 435-438
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Masking of ferromagnetic ellipsoidal shell in Earth’s magnetic field
Autorzy:
Jakubiuk, K.
Wołoszyn, M.
Zimny, P.
Powiązania:
https://bibliotekanauki.pl/articles/97594.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
mathematical models of magnetic field
magnetization of ferromagnetic object
masking of ferromagnetic object
windings for demagnetization of the ship
Opis:
A ferromagnetic object, located in the Earth’s magnetic field, changes the distribution of that field. By measuring such disturbances it is possible to detect the object and destroy it. To conceal the object, a special winding is placed inside its ferromagnetic shell, which function is to eliminate the disturbances in the distribution of the Earth’s magnetic field. A thin walled ellipsoidal shell made of ferromagnetic material are examined as the object model. Coils are placed inside the shell and their function is to generate a magnetic field, which eliminates the effect the shell makes on the distribution of the Earth’s magnetic field in the surrounding area. Such a procedure is called magnetic masking and the winding used for this purpose is called the masking winding. The possibility of building the masking windings for the ferromagnetic ellipsoidal shell, situated in a magnetic field transverse in relation to its major axis, is also examined. Masking of a thin-walled ellipsoidal ferromagnetic object located in the longitudinal magnetic field is described in the article [1]. Investigating the possibility of masking of objects in a transverse magnetic field presented in this article will allow for a comprehensive assessment of a possibility of masking thin walled ferromagnetic objects of elongated ellipsoidal shape. The solution of Maxwell’s equations, which describe the magnetic field distribution caused by the ferromagnetic shell presence in the Earth’s magnetic field, are applied. Furthermore, the ability of selecting coils, which fully eliminate the perturbations of the magnetic field outside the shell are proven.
Źródło:
Computer Applications in Electrical Engineering; 2013, 11; 92-99
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ferromagnetic flow of viscous fluid in a slot between fixed surfaces of revolution
Autorzy:
Sawicki, J.
Powiązania:
https://bibliotekanauki.pl/articles/260429.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
laminar flow
incompressible ferromagnetic fluid
method of perturbation
Opis:
In this paper the steady laminar flow of viscous incompressible ferromagnetic fluid is considered in a slot between fixed surfaces of revolution having a common axis of symmetry. The boundary layer ferromagnetic equations for axial symmetry are expressed in terms of the intrinsic curvilinear orthogonal coordinate system x, θ ,y.The method of perturbation is used to solve the boundary layer equations. As a result, the formulae defining such parameters of the flow as the velocity components vx, vy, and the pressure , were obtained.
Źródło:
Polish Maritime Research; 2016, 4; 99-104
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reflection of surface spin waves from the interface of uniaxial and biaxial ferromagnets in a planar magnetic field
Autorzy:
Reshetnyak, S. O.
Nastenko, M. Y.
Berezhinsky, A. S.
Powiązania:
https://bibliotekanauki.pl/articles/412236.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
surface spin waves
ferromagnetic medium
spin pinning
reflection
Opis:
The article investigates the process of reflection of surface spin waves passing through the interface of uniaxial and biaxial ferromagnets in a planar external magnetic field directed along the hard axis of ferromagnet. The problem is solved using the spin density formalism and the Landau-Lifshitz equations for the case of the absence of dissipation in the system. Geometrical optics formalism is used to describe the processes of refraction of surface spin waves propagating in the ferromagnetic medium with non uniform distribution of magnetic parameters. Quantum mechanical approach is used for calculation of the amplitudes of reflected and transmitted waves. It is shown that spin wave birefringence phenomenon appears at the interface of two uniform ferromagnetic components. Frequency and field dependencies of reflection coefficients for different branches of spin waves are obtained in the study. It is shown that it is possible to change the “optical” parameters of the system by only changing a magnitude of the external homogeneous magnetic field. It is also shown that reflection amplitude depends heavily on the angle of incidence.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 9; 71-83
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of local properties of the Fe-Si alloy subjected to mechanical and laser cutting
Autorzy:
Gmyrek, Zbigniew
Kucharska, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/27309942.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
ferromagnetic materials
mathematical modeling
non-invasive measurement
structure destruction
Opis:
The effective design of energy-saving electric motors with efficiency class IE4 and higher requires the use of material characteristics that take into account the core shaping process. Therefore, it becomes necessary to use analytical or numerical models that take into account the change of local properties of Fe-Si material. The aim of the work is to indicate a useful analytical model for estimating the local magnetic permeability of the material, as well as to understand the reasons for these changes. For this purpose, low-loss ferromagnetic materials cut with a guillotine and a laser were tested. Rectangular samples, cut at an angle of 0 degrees in relation to the rolling direction, were subjected to macroscopic and microscopic examinations. Finally, the main reasons for changes in material characteristics for both cutting technologies were indicated. Therefore, the proposed model takes into account not only the cutting technology used, but also the current width of the tested strip, for which the material characteristics are to be determined. The parameters of the analytical model are determined on the basis of a limited number of measurements carried out on samples of a simple geometric shape.
Źródło:
Archives of Electrical Engineering; 2023, 72, 3; 697--713
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal convection in a ferromagnetic fluid layer with magnetic field dependent viscosity: a correction applied
Autorzy:
Prakash, J.
Kumar, R.
Kumari, K.
Powiązania:
https://bibliotekanauki.pl/articles/178325.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
ferromagnetic convection
magnetic field dependent viscosity
stationary convection
Rayleigh number
Opis:
The effect of magnetic field dependent (MFD) viscosity on thermal convection in a horizontal ferromagnetic fluid layer has been investigated numerically. A correction is applied to Sunil et al. [24] which is very important in order to predict the correct behavior of MFD viscosity. Linear stability analysis has been carried out for stationary convection. The MFD viscosity parameter δ as well as the measure of nonlinearity of magnetization M3, both have a stabilizing effect on the system. Numerical results are also obtained for large values of magnetic parameter M1 and predicted graphically.
Źródło:
Studia Geotechnica et Mechanica; 2017, 39, 3; 39-46
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal fields calculation of cylindrical inductor loaded by a bundle of ferromagnetic rods
Obliczanie pola temperatur cewki indukcyjnej obciążonej wiązką prętów ferromagnetycznych
Autorzy:
Berezyuk, A.O.
Kondratenko, I.P.
Rashhepkin, A.P.
Powiązania:
https://bibliotekanauki.pl/articles/56192.pdf
Data publikacji:
2013
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
thermal field
calculation
cylindrical inductor
finite element method
ferromagnetic field
Opis:
In this paper the combined method of calculating thermal and electromagnetic fields of a cylindrical inductor, which is loaded by a bundle of ferromagnetic rods, has been developed. The method is based on the analytical solution of the electromagnetic characteristics and 2-D (FEM) simulation of the allocation of temperature fields by finite element method. It was found that the steady state of the inductor, which has the installed capacity of 4.5 kW, comes in 350—100 s. after heating, the maximum temperature of the rods in the central zone is 68°C, the temperature of the heated material - 48°C, which satisfies the technological process of heating the seeds before removing oil.
Obliczanie pola temperatur cewki indukcyjnej obciążonej wiązką prętów ferromagnetycznych. Opracowano metodę obliczeń pola temperatur i charakterystyki elektromagnetycznej wymiennika ciepła w postaci cylindrycznej cewki indukcyjnej obciążonej wiązką prętów ferromagnetycznych. Opracowana metoda jest oparta na obliczeniach gęstości wytwarzania ciepła i aproksymacji wyników przy użyciu wielomianów opisujących alokację gęstości temperatur. Przedstawiono numeryczne rozwiązania problemów termicznych przy wykorzystaniu metody elementów skończonych. Stwierdzono, że stan ustalony cewki o zainstalowanej mocy 4,5 kW występował po czasie 35CM00 s po ogrzaniu, maksymalna temperatura prętów w strefie środkowej wynosiła 68°C, a temperatura ogrzewanego materiału 48°C; spełnia to wymagania procesu technologicznego ogrzewania nasion przed ekstrakcją oleju.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Agriculture; 2013, 62 Agric.Forest Eng.
0208-5712
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Agriculture
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Układ mostkowy do badania właściwości magnetycznych rdzeni stosowanych w transformatorach pomiarowych
Bridge circuit for magnetic properties testing of cores used in measuring transformers
Autorzy:
Piaskowy, A.
Skórkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/157548.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
ferromagnetyki
przenikalność magnetyczna
transformator pomiarowy
soft ferromagnetic material
permeability
measuring transformer
Opis:
Artykuł przedstawia metodę i układ do badania właściwości magnetycznych materiałów charakteryzujących się dużą podatnością magnetyczną. Przedstawiono charakterystyki wiążące parametry magnetyczne z wymiarami geometrycznymi badanych rdzeni, które wykorzystuje się w procesie projektowania precyzyjnych transformatorów pomiarowych.
Measurement method and circuit for research of magnetic properties of materials of large magnetic susceptibility is presented. Charts binding magnetic parameters with the geometric dimensions of investigated cores, which are used in the design process of precise measuring transformer can be formed basing on the measuring results. On stage of determining possible error limits of measuring transformer, necessary is the knowledge of parameters of equivalent circuit, which can be obtained based on the material magnetic properties. Measurement of the transverse branch parameters of transformer equivalent circuit was realized in Hay bridge circuit. Summarized diagrams of the transverse branch parameters of equivalent transformer circuit obtained from research of toroidal core made of "Finemet" material are presented.
Źródło:
Pomiary Automatyka Kontrola; 2014, R. 60, nr 12, 12; 1147-1149
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-contact harmonic detection of ferromagnetic material defects based on SQGSR and OPLTF
Autorzy:
Zhao, Yizhen
Wang, Xinhua
Chen, Yingchun
Ju, Haiyang
Shuai, Yi
Powiązania:
https://bibliotekanauki.pl/articles/1848986.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
harmonic detection
ferromagnetic materials defects
focusing vector array
signal extraction algorithm
Opis:
In order to find the defects in ferromagnetic materials, a non-contact harmonic detection method is proposed. According to the principle of frequency modulated carrier wave, a tunnel magneto resistance harmonic focusing vector array detector was designed which radiates lower and higher frequency electromagnetic waves through the coil array to the detection targets. We use bistable stochastic resonance to enhance the energy of collected weak target signal and apply quantum computation and a Sobol low deviation sequence to improve genetic algorithm performance. Then we use the orthogonal phase-locked loop to eliminate the intrinsic background excitation field and tensor calculations to fuse the vector array signal. The finite element model of array detector and the magnetic dipole harmonic numerical model were also established. The simulation results show that the target signal can be identified effectively, its focusing performance is improved by 2 times, and the average signal-to-noise ratio is improved by 9.6 times after the algorithm processing. For the experiments, we take Q235 steel pipeline as the object to realize the recognition of three defects. Compared with the traditional methods, the proposed method is more effective for ferromagnetic materials defects detection.
Źródło:
Metrology and Measurement Systems; 2021, 28, 1; 55-72
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
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