In the present High Temperature Superconducting (HTS) maglev vehicle system, the nonuniformity of the magnetic field along the movement direction above the NdFeB guideway is inevitable due to the assembly error and inhomogeneous of the material property of the NdFeB magnet. In order to investigate the influence of the nonuniformity on the levitation ...
NASA Astrophysics Data System (ADS)
... The third moment, which is a measure of skewness of the MAE bust, is plotted as a function of the applied AC magnetic field intensity for steel ...
DTIC Science & Technology
The response of 360� domain walls in narrow magnetic stripes to applied dc and ac currents, investigated by micromagnetic simulation, differs qualitatively from the response of 180� domain walls. The 360� domain-wall velocity scales with a dc current but is independent of an applied ...
The frequency dependence of magnetic ac loss of thin superconductor strip subjected to an ac magnetic field perpendicular to the surface of the strip is investigated by incorporating a flux creep model into the critical state model of Brandt and Indenbom. It is found that the reduced ac loss ...
The nonlinear stationary ac response of the magnetization of assemblies consisting of (i) noninteracting uniaxial superparamagnetic nanoparticles with aligned easy axes and (ii) randomly oriented nanoparticles subjected to superimposed ac and dc bias magnetic fields of arbitrary strength and orientation is ...
ac losses of superconducting solenoidal coils were investigated with a calorimetric method while applying a current or uniform magnetic field of 50 Hz with a sinusoidal wave form. The peak value of the ac current was varied from 0 to 15 rms A and that of the ac magnetic ...
Energy Citations Database
We present a detailed magnetic study of iron containing carbon nanotubes (Fe-CNT), which highlights their potential for contactless magnetic heating in hyperthermia cancer treatment. Magnetic field dependent AC inductive heating experiments on Fe-CNT dispersions show a substantial temperature increase of Fe-CNT ...
... the applied axial AC magnetic field ranged from I kHz to 35 kHz ... were performed in a conventional Joule heated furnace under argon atmosphere for ...
The quantum transport theory of electronic conduction in the presence of a strong magnetic field is extended to the case of an applied alternating transverse electric field. The ac magnetoconductivity is calculated for a long-wavelength electric field, ta...
National Technical Information Service (NTIS)
Results are reported of low magnetic field studies of dc magnetic susceptibility and ac magnetic susceptibility of bulk samples and powders. These data are analyzed and compared with the microstructures and compositions of the samples as determined by scanning electron microscopic micrographs, X-ray and chemical ...
This paper attempts to explore the effects of the different external fields on the inverse susceptibility-temperature curve. The superlinear property found in the inverse susceptibility-temperature curve of magnetic nanoparticle colloid solutions is assumed to be related to dimer disruption. The ac magnetic field accelerates cluster ...
The effect of a magnetic field on the Gibbs free energy of a material depends on its magnetization behaviors. To investigate the change in the Fe-Fe3C phase diagram caused by a high external magnetic field, the magnetic Gibbs free energies of the phases such as austenite, ferrite, and cementite are calculated on ...
Halbach cylinders are applied to brushless ac servo motors. It is shown that a sinusoidal back-emf waveform and a low cogging torque can be achieved without recourse to conventional design features such as distributed windings and/or stator/rotor skew. A technique for imparting a multipole Halbach magnetization distribution on an ...
The harmonic balance finite element method (HBFEM) proposed is suited to analyzing the time-periodic magnetic field. An AC magnetic field calculation involving saturation characteristics requires many iterations and the intricate procedures for the time derivative. The procedure of the numerical calculation for a new FEM is ...
... Title : AC MAGNETIC FIELDS IN THE ... CALCULATIONS OF THE IMPEDANCE OF A ... IS ACCOMPLISHED BY TWO INDEPENDENT METHODS. ...
Numerical simulations of hysteretic ac losses in a bilayer superconductor/ferromagnet heterostructure subject to an oscillating transverse magnetic field are performed within the quasistatic approach, calling upon the ANSYS finite-element software program and exploiting magnetostatic-electrostatic analogs. It is shown that one-sided ...
Magnetization AC losses in striated YBCO conductors in a perpendicular applied AC magnetic field were investigated with special regard to the coupling current AC loss (CCAC). The AC loss of YBCO samples of different length L was measured by using ...
We apply a Langevin model to investigate the nonlinear ac responses of electro-magnetorheological (ERMR) fluids under the application of two crossed dc magnetic (z axis) and electric (x axis) fields and a probing ac sinusoidal magnetic field. We focus on the influence of the ...
PubMed
A pyrotron-type machine is designed for carrying out thermonuclear reactions. Loss of charged particles is minimized by reflecting them in an axially symmetrical magnetic field with an a-c electric field applied transversely to the magnetic field. (D.L.C.)
Several investigators have studied flux varying in quadrature with a small ac field applied to a magnetic film in the presence of a perpendicular dc field, i.e., the imaginary part of the susceptibility. This phenomenon has often been interpreted as arisi...
A magneto-optical technique was developed to measure the spin-lattice relaxation time of paramagnetic ions in a crystal lattice as a function of applied static magnetic field strength. This method utilized the Faraday effect at low temperatures. An ac mag...
This report discusses the AC losses in the MICE channel magnets during magnet charging and discharging. This report talks about the three types of AC losses in the MICE magnets; the hysteretic AC loss in the superconductor, the coupling AC loss in the ...
The successful application of superconductivity to motors and other power system components depends on the characterization and subsequent minimization of the ac loss in the superconductor used for fabrication of the component. The superconductive component, excited by an ac power source, may be exposed to large dc magnetic fields ...
To study the nonlinear dynamics of a uniformly precessing magnetization in perpendicularly magnetized (100) ferrite-garnet films, equations of motion are numerically solved over a wide ac field frequency range. Bifurcation changes in the magnetization precession and the states of dynamic bistability have been ...
When a nonuniform a-c field is applied to a charged particle it experiences a time-averaged acceleration in addition to the a-c acceleration. The development and application of the basic theory to plasmas are outlined, including some cases with a d-c magnetic field. A bibliography and a critique of theory ...
Optical DC current and voltage measurement using Faraday or Pockels effect necessitates the compensation of light intensity variation with some methods, because it is possible the intensity variation may give rise to a measuring error. We have proposed a method which suggests superposing AC magnetic field on linearly polarized light or ...
A dual-function circuit is provided which may be used to both magnetically bias and alternately, quickly degauss a magnetic device. The circuit may be magnetically coupled or directly connected electrically to a magnetic device, such as a magnetostrictive transducer, to magnetically bias the ...
DOE Information Bridge
We apply ac and dc magnetic fields simultaneously in orthogonal directions to each other to a solution, in which paramagnetic microparticles are dispersed, and show that complex secondary structures composed of oscillating chain clusters, that is, long linear clusters interconnected by T-, L-, and criss-cross-junctions, are ...
The author of this thesis has measured the AC magnetic response function mu = mu'+i-mu'' in melt-powder-melt-growth YBa2Cu3O7 (Y123) with insulating Y2BaCuO5 (Y211) and in single crystal YBa2Cu3O7 (SC) in applied DC fields up to 8 T, oriented both paralle...
... OF THE MAGNETIZATION OF FERROMAGNETS REMAGNETIZED BY AN AC FIELD, WITH MAGNETIC HYSTERESIS TAKEN INTO ACCOUNT. ...
Magnetism can affect losses in superconducting coils in two ways. First, there is magnetic loss ('core loss'). This can be separately measured as a function of magnetic induction in the material of interest (usually the substrate on which a superconducting film is grown). One can then find the fields in the coil when a current is ...
with respect to the strength of the applied inhomogeneous magnetic field. Taking into ac- count the LGMFSelf-Diffusion Imaging by Spin Echo in Earth's Magnetic Field Ales Mohoric, Janez Stepisnik, Miha July 30, 1998 The NMR of the Earth's magnetic field is used for diffusion- weighted imaging ...
E-print Network
that the anisotropy of the valence band affects the anisotropy of the magnetism. Indeed, previous studies have shown. (a) Temperature dependence of field-cooled magnetizations and (b) hysteresis curves along different temperatures. domain model, the magnetic free energy when an exter- nal field is applied, for ...
A magnetically induced superflow in the /sup 3/He-A/sub 1/ phase was observed at pressures of 21.7 and 25.7 bars at an applied magnetic field of 3.6 kG. Both a transient and an ac flow were induced. From the observed direction of flow, it is concluded that the magnetic moment of the superfluid ...
This lecture discusses the physics of ac losses in type-II superconductors and in multifilamentary superconducting-normal composite conductors. As an introduction, the ac eddy-current losses in a homogeneous normal conducting cylindrical specimen subjected to an alternating applied magnetic field are briefly ...
AC magnetic fields are applied at the shell of the Madison Symmetric Torus (MST), and these penetrate into the plasma. The applied poloidal and toroidal fields are used in oscillating field current drive (OFCD). The initial OFCD system should be capable of driving a portion of the total plasma toroidal current. In ...
...AC-powered magnet. (a) Identification. An AC-powered magnet is an AC-powered device that generates a magnetic field intended to find and remove metallic foreign bodies from eye tissue. (b) Classification. Class...
Code of Federal Regulations, 2011
An electric motor using thyristor switches to allow connection to an ac supply voltage is described. The thyristor switching is accomplished in part, by the use of a sensor which notes and uses relative positions of the magnetic fields of the armature and of the field to change the gate voltage applied to the thyristor and, in part, by ...
... Abstract : MEASUREMENT OF THE AC MAGNETIC SUSCEPTIBILITY OF A LARGE, WEAKLY MAGNETIC OBJECT HAS ADVANTAGES OVER DC ...
... MAGNETIC SENSOR FOR A DIRECT MEASUREMENT OF THE AC INITIAL PERMEABILITY OF FULL WAFER SOFT MAGNETIC FILMS (UP TO ...
... for an AC magnetic source at a ... The vehicle towed satisfactorily over the ... Descriptors : *TOWED VEHICLES, *UNDERWATER VEHICLES, TOWING ...
... Title : CALCULATIONS OF THREE-DIMENSIONAL AC MAGNETIC FIELDS NEAR DEFECTS IN FERROMAGNETIC BARS. Corporate Author : ...
Stray voltages in dairy facilities have been studied since the 1970`s. Previous research using steady-state ac and dc voltages has defined cow-contact voltage levels which may cause behavior and associated production problems. This research was designed to address concerns over possible effects of transient voltages and magnetic fields on dairy cows. Dairy ...
The various ongoing programs in applied superconductivity supported by BNL are summarized, including the development of high field ac and dc superconducting magnets for accelerators and other applications, of microwave deflecting cavities for high energy ...
The connected-diagram method is applied to the evaluation of the a-c conductivity of an electron-impurity system subject to a constant magnetic field. The usual splitting of the density operator into diagonal and non-diagonal parts in free-electron states...
The impact of recent superconducting materials research is discussed, indicating research goals which appear realistic and, if reached, would enable diverse commercial applications of the new materials. Topics covered include: Renewable sources for electricity generation, Generators, Transformers, AC transmission, and Superconducting magnetic energy ...
A theoretical and experimental study is presented of the influence of thermally activated flux creep on the ac response of a type II superconductor in the mixed state. The theory describes the ac response of a cylindrical superconductor in the mixed state in an axial dc magnetic field and a superposed parallel ac ...
We present a setup allowing to characterize the local irreversible behavior of soft magnetic samples. It is achieved by modifying a conventional ac induction magnetometer in order to measure first-order reversal curves (FORCs), a magnetostatic characterization technique. The required modifications were performed on a home-made setup allowing high precision ...
Theory of ac losses in the type II superconductors in the frame of the critical state model (J. Thompson, M. Maley, and J. R. Clem, J. Appl. Phys. 50, 3531, 3518 (1979)) is applied to high T/sub c/ materials (Y-Ba-Cu-O) assuming an exponential drop of the critical current density J/sub c/ with both magnetic field and temperature. The ...
The superconducting maglev vehicle is one of the most promising applications of HTS bulks. In such a system, the nonuniformity of the magnetic field along the movement direction above the NdFeB guideway is inevitable due to the assembly error and inhomogeneity of the material property of the NdFeB magnet. So it is required to study the characteristics of ...
AD-A021 132 DESIGN AND EVALUATION OF A TOWED AC MAGNETIC SOURCE VEHICLE ... Design and Evaluation of a Tomd AC Fagmtic * ...
Pulsed high field magnet coils are an important part of the applied-B ion diodes use in the light ion Inertial Confinement Fusion Program at Sandia National Laboratories. A new compact applied-B ion diode is now being tested on the Particle Beam Fusion Ac...
A simple model gave utilized for calculation of magnetization effects on ac loss and sextupole for Energy Doubler dipole magnets. The calculation in the simple model gave an underestimation of ac loss by about 30%. Results of computation on ac harmonics were also described.
A method for dissipating a remanent field, created when a magnetic field is brought into contact with a superconductor, comprising the steps of (1) providing a ceramic superconductor; (2) continuously or intermittently applying an AC current to the ceramic superconductor; (3) gradually removing the AC current until ...
We are experimentally studying basic AC loss properties of IBAD/CVD-YBCO coated conductors with a copper layer for stabilizing, especially the temperature dependence of perpendicular field loss in alternating electromagnetic environments. We prepared two types of short specimens with and without a copper layer and measured AC losses by a saddle-shaped ...
The alternate current biosusceptometry (ACB) is a biomagnetic technique used to study some physiological parameters associated with gastrointestinal (GI) tract. For this purpose it applies an AC magnetic field and measures the response originating from magnetic marks or tracers. This paper presents an equipment ...
This paper describes a method of effectively electroporating mammalian cell membranes with pulsed alternating-current (ac) electric fields at field strengths of 30-160 kV m(-1). Although many in vivo electroporation protocols entail applying square wave or monotonically decreasing pulses via needles or electrode plates, relatively few have explored the use ...
This paper describes a method of effectively electroporating mammalian cell membranes with pulsed alternating-current (ac) electric fields at field strengths of 30-160 kV m?1. Although many in vivo electroporation protocols entail applying square wave or monotonically decreasing pulses via needles or electrode plates, relatively few have explored the use ...
... Title : APPLYING AC IMPEDANCE ELECTROCHEMICAL METHODS TO CORROSION TESTING COBALT ALLOY MEDIA. Corporate Author : ...
In this paper a theoretical study of the radiation pattern of an antenna build up from a confined magnetoplasma is made. Assuming that the electron gas is in the linear regime, we derived expressions for the conductivity tensor of the plasma and the radiated electromagnetic field under the influence of both dc magnetic and ac electric externally ...
Exchange anisotropy in Co/CoO bilayers has been studied using electrical transport to probe the magnetization. The Ta(5nm)/Co(l00nm) samples were grown on single crystal CoO(l00) and CoO(111) oriented substrates by do magnetron sputtering. The measurements include both the AMR and the planar Hall effect by simultaneously applying a do and a perpendicular ...
Nb-Ti ultrafine multifilamentary wires with Cu-Si alloy matrix have been fabricated for AC use. An AC coil of 100 kVA-class capacity was wound by the stranded wire, and the coil has been operated in AC mode successfully. The stranded wire is composed of six elemental wires of 0.203 mm in diameter and a central stainless steel wire for ...
A set of experiments are carried out to measure and understand the response of a free-burning atmospheric pressure carbon arc to applied transverse dc and ac magnetic fields. The arc is found to deflect parabolically for the dc field and assumes a growing sinusoidal structure for the ac field. A simple analytic ...
The temperature rise of NiFe2O4 nanoparticles having diameters of 242 and 7.7 nm was measured. The results of the measurement were analyzed by comparing the areas of the hysteresis loops in order to clarify the mechanism of heat dissipation in the samples. The hysteresis loops were obtained by applying both ac and dc magnetic fields. ...
In the frame work of the critical state model (CSM), the magnetic response of a thin type-II superconducting disk that carries a radial transport current and is subjected to an applied magnetic field have been studied. To this end, we have studied the process of the magnetic flux-penetration. For a disk initially ...
This interactive presentation, created by Terry Bartelt for the Electromechanical Digital Library, discusses the rotations per minute (RPM) of AC motors. Bartelt begins with a discussion of the magnetism that allows most of these motors to function. The author addresses such factors as the frequency of the applied voltage and also the ...
NSDL National Science Digital Library
We discuss the interaction of a vortex array in a superconductor with sound oscillations, taking into account pinning forces between vortices and crystal displacements. The generation of ultrasound by an ac electromagnetic field acting on the vortex array is considered. We find that at low temperatures and in the linear regime the amplitude of the induced sound wave is ...
The magnetic properties, including ac core loss, dc hysteresis loss, eddy current loss, ac and dc permeability at 10 kG and 15 kG, and magnetic flux density at field strength 2,500 A/m, of 17 heats of fully processed, continuous-annealed low-carbon electrical steels with grain diameter from 8.98 {micro}m to 23.25 ...
Muon-spin-relaxation experiments and ac low-field magnetization measurements have been carried out on the superconductor CeRu2. The relaxation rate of the muon-spin polarization in zero field exhibits a small but significant increase below TM~=40 K, which is suppressed by applying a longitudinal field. This result taken together with ...
We have used E-Beam Lithography to prepare hybrid systems consisting of arrays of nanometric Ni rings (elliptical and circular)covered by a superconducting Nb film. These nanometric rings were characterized by a First Order Reversal Curve method to realize the onion and vortex magnetic state at remanence. The transport properties of the superconducting Nb film were measured in ...
We report on unusual field-induced magnetic phase transitions observed in a GdSi single crystal at low temperature. The magnetization curves initially show an anisotropic character between the b axis and the ac plane. With increasing applied field, the magnetization measured along the c ...
... Title : THE APPLICATION OF MAGNETIC FIELDS TO TIG WELDING ARCS-- PART I - TRANSVERSE AC MAGNETIC FIELD. Corporate Author : ...
A new ac loss behaviour is observed in the superconducting state of Bi(2)Sr(2)CaCu(2)O(8) single crystals using a novel technique of measuring dissipation at radio frequencies. It is found that�the ac loss in the superconducting state is larger than that in the normal state. This counter-intuitive result is explained in terms of the cumulative effect of ...
The temperature dependence of the inverse magnetic susceptibility of both Mn12-ac and Mn12-ac-MeOH is found to give finite temperature intercepts, indicating a ferromagnetic phase at low temperature [1, 2]. A magnetic field applied transverse to the Ising axis suppresses the Curie temperature, ...
The authors recently reported that cephalic regeneration in the planarian Dugesia tigrina was significantly delayed in populations exposed continuously to combined parallel DC and AC magnetic fields. This effect was consistent with hypotheses suggesting an underlying resonance phenomenon. The authors report here, in a parallel series of investigations on ...
We report the synthesis and structural and physical properties of CaFe4As3 single crystals. Needle-like single crystals of CaFe4As3 were grown out of Sn flux and the compound adopted an orthorhombic structure as determined by x-ray diffraction measurements. Electrical, magnetic, and thermal properties indicate that the system undergoes two successive phase transitions, ...
The assembly of meander shaped coated conductor tapes by the Roebel technique is a promising way to manufacture high current cables with low ac losses. The application of longitudinal striations to the single strands can be an option to create a filament structure for further possible reduction of the ac losses. Due to the complex Roebel strand geometry, ...
High-? tokamaks need robust magnetic feedback to cope with various MHD modes. A new algorithm was tested to improve the DIII-D feedback dynamic response. Magnetic sensor signals include contributions from vacuum sources, such as active coils. In the present algorithm, the plasma response to an applied field is computed by subtracting ...
Future use of coated conductors in electric power applications like transmission cables, transformers or fault current limiters is sensitive to the amount of dissipation in the AC regime. This paper analyses factors controlling AC loss of coated conductors in typical configurations: the self-field case when transport current generates the ...
To identify the microscopic mechanisms of organic magnetoresistance (OMAR), the dependency on the frequency of the applied magnetic field is explored, which consists of a dc and ac component. The measured magnetoconductance decreases when the frequency is increased. The decrease is stronger for lower voltages, which is shown to be ...
... Abstract : A mutual inductance bridge for measuring ac magnetic susceptibility at low frequencies, using standard components, is described. ...
... Abstract : An attempt was made to demonstrate the dynamic AC stabilization of the magnetic confinement of a plasma column in a theta-pinch ...
... Title : AC LOSSES OF SUPERCONDUCTING COMPOSITES WITH 8 MU-M NBTI FILAMENTS IN A DC MAGNETIC FIELD WITH A ...
Homopolar. Inductor. Permanent-Magnet. AC Generator. PM Rotor. Types. Earliest. PM Generator ... Weight. Breakdown for a Homopolar. Inductor. AC Generator ...
NASA Website
Results of ac magnetic susceptibility measurements performed on the trigonal prismatic complex U(Ph(2)BPz(2))(3) demonstrate the presence of slow magnetic relaxation under zero applied dc field. Analysis of both the temperature and frequency dependence of the ac susceptibility indicate a ...
We have compared the structure parameters of magnetic core-shell nanoparticles determined from fluxgate magnetorelaxometry measurements applying the moment superposition model with the results from other methods. For the characterization of the magnetic cores, the nanoparticles are immobilized by freeze-drying. The core size ...
AC susceptibility of magnetic markers in solution was studied for biosensor applications. First, frequency dependence of the susceptibility was measured, and size distribution of the markers was estimated by analyzing the experimental result with the so-called singular value decomposition (SVD) method. The size distribution estimated with the ...
... System A custom designed AC nulling circuit will supplied in order to cancel AC flux from the AC magnet that is coupled into the input circuits. ...
This report discusses the AC losses in the MICE channelmagnets during magnet charging and discharging. This report talks aboutthe three types of AC losses in the MICE magnets; the hysteretic AC lossin the superconductor, the coupling AC loss in the superconductor and ...
The authors are developing a 4 pole 50 Hz 30 kVA class fully superconducting generator to investigate the characteristics of superconducting armature windings subject to a rotating magnetic field. Compared with other fully superconducting generators that have been developed and tested, this machine is designed to obtain a higher armature current. It is generally observed in ...
We are developing a 4 pole 50 Hz 30 kVA class fully superconducting generator to investigate the characteristics of superconducting armature windings subject to a rotating magnetic field. Compared with other fully superconducting generators that have been developed and tested, our machine is designed to obtain a higher armature current. It is generally observed in coils wound ...
Magnetic fluid hyperthermia (MFH) is a cancer treatment in which biocompatible magnetic nanoparticles are dispersed into a tumor and heated by an external AC magnetic field. Over a period of time, the tumor cells are locally heated, leading to hyperthermia which damages and kills the tumor cells with minimal damage ...
Here, the volume-amplified magnetic nanobead detection assay (VAM-NDA) is for the first time applied for detection of rolling circle amplified (RCA) DNA molecules in a portable, commercial AC susceptometer that operates at ambient temperatures and with an analysis time of about 20min. The performance of the assay is investigated using ...
Soft magnetic Co and Fe films were deposited by pulsed laser ablation on Cu wires. The circular magnetic susceptibility of the cylindrical films was measured by applying an ac circular magnetic field at frequencies up to 6 GHz. The measured ferromagnetic resonance frequency of the Co films was ...
This book contains chapters on: the current-carrying mixed state at low and high fields; flux pinning and critical current density; current transport in a longitudinal applied magnetic field; flux in motion under the influence of a transport current; small-coil testing; stability; AC loss; conductor design; conductor fabrication; ...
AC Biosusceptometry offers an alternative to investigate noninvasively and without ionizing radiation the behavior of solid dosage forms in vitro and in the human gastrointestinal tract. This versatility allowed applying this technique in a wide field ranging from characterization of the disintegration process to elucidation of how the physiological ...
Page 1. Electrical and Magnetic Properties of D6ac Steel SK Burke and ME Ibrahim ... Page 3. Electrical and Magnetic Properties of D6ac Steel ...
We report DC magnetization, detailed systematic linear and nonlinear AC magnetic susceptibility and transport for a single phase RuSr2Eu1.4Ce0.6Cu2O10-? (EuRu-1222) magneto-superconductor. The studied sample is synthesized through standard solid state reaction route, which is crystallized in single phase tetragonal structure with space ...
Ac susceptibility is used to measure a small shift of the coupling peak of the imaginary part of the ac susceptibility (?'') to a higher temperature as the frequency is increased. Applying the Bean model one obtains the zero-field and zero-temperature intergranular pinning potential U(0,0) and critical, integranular current density ...
Systematic dc and ac magnetic susceptibility measurements performed on RuSr2Eu1.5Ce0.5Cu2O10-? (Ru1222) demonstrate a paramagnetic to ferromagnetic transition around 95 K. The third harmonic of the ac susceptibility reveals that the system undergoes a spin glass transition below 75 K. The features of the zero-field cooled and field ...
... Accession Number : ADA474883. Title : Electrical and Magnetic Properties of D6ac Steel. Descriptive Note : Technical note. ...
The electromagnetic response of a round tubular wire of superconducting film to a transverse magnetic field is investigated theoretically. For a superconducting tubular wire (STW) in which the thickness d of the superconducting layer is much smaller than the radius R of the wire, analytical expressions for the magnetic-field and current distributions are ...
Concentrated spin-glass behavior is discovered in a mechanically milled crystalline compound GdN. We report on measurements of magnetic relaxation and both ac and dc magnetic susceptibility at temperatures between 2 and 300 K in a magnetic field up to 5 T. Both ac and dc ...
Formulae are presented for the eddy current AC power loss and the AC hysteresis loss of z-stacks and x-arrays made of metal-superconductor strips. The AC self-field case and the applied AC magnetic field case are examined for different stacking spacings of a z-stack and ...
The AC magnetic losses at power frequencies (60 Hz) were investigated for mono- and multifilament Ag-sheathed (Bi, Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub y} (BSCCO-2223) tapes with similar transport critical current (I{sub c}) values at 77 K. The multifilament sample exhibited higher losses than the monofilament under the same conditions. Loss peaks ...
Dynamic response behavior of magnetization within the frequency of 1--20 MHz in Co-based amorphous strip films is observed with a scanning Kerr microscope. When an ac current is applied to the conductor under a strip, immovable and movable magnetic regions appear alternately from the 180{degree} walls to the ...
In this paper an improved measurement system for experimental assessment of magnetic fluid losses is presented. When fluid is exposed to AC magnetic field, three different losses mechanisms are active; relaxation, hysteresis and resonance mechanism. In this paper not individual contributions where studied but combine acting which can ...
This paper discusses the physics of ac losses in type-II superconductors and in multifilamentary superconducting-normal composite conductors. As an introduction, the ac eddy-current losses in a homogeneous normal conducting cylindrical specimen subjected to an alternating applied magnetic field are briefly ...
Neogene and Quaternary volcanic activity formed the large volume ignimbritic units (about 10 different units, namely Cappadocian ignimbritic field) around Nev?ehir, Derinkuyu and Ac?g�l districts. These large volume ignimbrites are mostly caldera-related products but the calderas are partially or totally buried by later pyroclastic and sedimentary cover. Source estimations ...
This paper describes measured AC losses of NbTi Rutherford type cable when the wide side of the cable is parallel to the field variation. In the case of a Rutherford type cable, the orientation of the cable in the magnetic field is an important factor for the interstrand coupling loss which can be dominant over other AC losses such as ...
