... 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 ...

... Abstract : A mutual inductance bridge for measuring ac magnetic susceptibility at low frequencies, using standard components, is described. ...

A calorimeter has been developed to measure the total core loss in small samples of magnetic materials which are not suited to conventional measurement techniques. The method is similar to the helium boil-off calorimeter used in some cases to measure ac l...

The report deals with hysteresis losses at 4 K measured by magnetization and complex magnetic susceptibility. The theoretical and experimental relationships between ac susceptibility and magnetization as functions of dc field were examined in terms of the...

AC losses in full length and 1.5 m model SSC collider dipoles were successfully measured by the direct observation of energy flow into and out of magnets during a ramp cycle. The measurement was performed by using two double-integrating type digital volt ...

AC AIR CORE SOLENOID . n d/2. MAGNETS IN HELMHOLTS. CONFIGURATION. SAMPLE. ---. Fig. loa Ac Hall effect measurement. Illustrating arrangement of ...

... Abstract : An AC magnetic permeability method has been developed for continuously monitoring the course of the strain-induced martensitic ...

Similarities and differences of the thermal analysis issues between the intelligent and general AC contactors are analyzed. Heat source model of the magnet system is established according to the unique control mode of the intelligent AC contactor. Linking with the features common of the two kinds of contactors, the extension of the ...

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 ...

The nonlinear diffusion of magnetic flux into a superconducting sample can be studied by measuring the relaxation of the magnetisation after application of a step field or by measuring the ac susceptibility, (chi)(sub 1) and its third harmonic, (chi)(sub ...

... 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 ...

A hysteresis curve of ac magnetostriction was measured, magnetizing a grain oriented silicon steel in the direction deviated from rolling direction of a sample. The ac magnetostriction ({lambda} ac) curves were analyzed as harmonics in the interest of noise spectrum of such as a power ...

An analysis of a new method for measuring ac losses in superconducting magnets is described. The integral of compensated voltage across the magnet and a magnet current differential are multiplied. The result of multiplication is integrated and digitally displayed. The accuracy of the electronic ...

The UARS PEM level 2 VMAG AC daily product (UARPE2VMAGAC) contains ... measured with a peak detector and are the Vector Magnetic Field AC component. ...

... in ac quantized Hall resistance measurements are 1233 ... Bw(z) are magnetic flux densities generated by ... a constant magnetic flux density that does ...

The SSC collider is designed to have circumference of 87 km. The superconducting magnets along the collider ring are grouped into ten sectors. Each sector, a string of average length of 8.7 km,m is powered by one power source located near the center of the sector. Because of the alternating-current (ac) electrical characteristics of the ...

Magnetization and ac susceptibility of a standard NbTi superconductor were measured as a function of longitudinal dc magnetic field. The ac-field-amplitude and frequency dependences of the complex susceptibility are examined. The magnetization is related to the ...

A calorimeter has been developed to measure the total core loss in small samples of magnetic materials which are not suited to conventional measurement techniques. The method is similar to the helium boil-off calorimeter used in some cases to measure ac losses in superconductors. Power losses ...

A calorimeter has been developed to measure the total core loss in small samples of magnetic materials which are not suited to conventional measurement techniques. The method is similar to the helium boil-off calorimeter used in some cases to measure ac losses in superconductors. Power losses ...

The DC magnetization and AC complex magnetic susceptibilities were measured for MgB2 single crystals, unsubstituted and carbon substituted with the composition of Mg(B0.94C0.05)2. The measurements were performed in AC and DC magnetic fields oriented ...

A series of prototype superconducting dipole magnets have been constructed and tested as part of the ISABELLE Project research and development program. Results of magnetic field measurements are presented with emphasis placed on the DC and AC components o...

Residual resistivity ratio RRR is an important integral characteristic of material purity. It was proposed to determine the RRR on base of the AC susceptibility. AC susceptibility of a number of single crystal niobium samples of different orientations types ( <100>, <011,><111> rpar; and differently treated (BCP 70, 150 ?m, annealing ...

Measurements of the ac and dc magnetic fields produced by natural internal ion currents in living systems are useful in principle because they can reduce or bypass the limitations of surface voltage measurements. The magnetic fields from the normal human ...

Magnetic measurements, like magnet design, is a broad subject. It is the intention of this lecture to cover only a small part of the field, regarding the characterization of the line integral field quality of multipole magnets (dipoles, quadrupoles and sextupoles) using compensated rotating coils. Other areas which ...

A mutual inductance bridge for measuring ac magnetic susceptibility at low frequencies, using standard components, is described. The equivalent of a decade mutual indicator is achieved by using a commercial decade autotransformer in combination with a sma...

The theory and calculation of a.c. losses in type II superconducting materials and superconducting coils are presented. The calculated losses are compared to loss-measurements in solenoids performed by several laboratories. Methods of loss measurements are described. (author)

We made a minimal set of AC magnetic measurements of the engineering model of the ALS Booster Dipole Magnet as part of the process of qualifying its design for production. Magnetic induction integrals over paths approximating electron-beam trajectories were measured with ...

We report on the development of a sensitive high frequency susceptometer capable of measuring in the frequency range from 25 kHz up to 10 MHz with a volume susceptibility sensitivity of 3.5�l0-5 at 100 kHz corresponding to about 0.3% of the measured AC susceptibility. In combination with the previous reported DynoMag system capable ...

The flow rate of a conducting fluid in a stream is determined by disposing two permanent-magnet flowmeters in the stream, one downstream of the other. Flow of the conducting fluid causes the generation of both d-c and a-c electrical signals, the a-c comprising flow noise. Measurement of the time delay between ...

Studies of magnetic relaxation phenomena are important for understanding the properties of magnetic materials, and M�ssbauer spectroscopy has contributed much to the elucidation of the magnetic dynamics in solids. In experimental studies of relaxation phenomena, the time scale of the experimental technique is a crucial parameter, ...

... Title : AC MAGNETIC FIELDS IN THE ... CALCULATIONS OF THE IMPEDANCE OF A ... IS ACCOMPLISHED BY TWO INDEPENDENT METHODS. ...

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 ...

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 ...

Alternating current loss as a function of current and external magnetic field in commercial NbTi superconductors has been measured with an electronic wattmeter. The loss varies as the current cubed, and the increase of loss with the external magnetic fiel...

We study quantum spin-rotation effects for a single-molecule magnet bridged between two conducting leads in the ac and dc magnetic fields. The Landau�Zener dynamics induced by the magnetic field generates mechanical torque, making the molecule to oscillate. This mechanical motion of the molecule exhibits unique ...

The magnetization loss density in stacked GdBa2Cu3O7?? coated conductor was measured using a SQUID magnetometer in a magnetic field normal to the tape surface to investigate the effect of stack on the magnetization loss. The AC loss characteristics are successfully collapsed to a single curve ...

AC losses determined with a helium boil-off calorimeter qualitatively agree with those predicted from DC magnetization measurements for a number of niobium and niobium-zirconium superconducting samples. This is consistent with a hysteretic model of AC los...

A series of prototype superconducting dipole magnets have been constructed and tested as part of the ISABELLE Project research and development program. Results of magnetic field measurements are presented with emphasis placed on the DC and AC components of the main field. Magnetization and the ...

Superconducting dipole magnets for accelerators have shown various quench current degradations and unexpected field disturbances even when they were fabricated with the same cables. Such degradations become harmful in terms of the stable operation of accelerators. The reasons for the degradations seem to be caused by AC losses due to coupling currents ...

Energy dissipation, which is also called AC loss, of a composite multifilamentary superconducting wire is one of the most fundamental concerns in building a stable superconducting magnet. Characterization and reduction of AC losses are especially important in designing a superconducting magnet for generating ...

such as ac and dc conductivity, Hall and Seebeck effects, magnetoresistivity, and thermal conductivity. Measurement of magnetic properties is another area of expertise for...

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 ...

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 ...

AC losses of NbTi-Cu and NbTi-Cu-CuNi superconducting composite magnets have been measured by means of an electronic integration technique. The experimental results are presented and their qualitative comparisons are made. It is shown within our experimental range that: (1) AC losses of NbTi-Cu composite ...

The AC loss characteristics of a magnet-superconductor system were studied with the magnet fixed to the free end of an oscillating cantilever located near a stationary melt-textured YBCO pellet. Below a threshold AC field amplitude {approx}2Oe, the dissipation of the oscillator is amplitude-independent, ...

A novel multiplexed sensing scheme based on the measurement of the magnetic susceptibility of the affinity captured target molecules on magnetic nanoparticles in liquid suspension is proposed. The AC magnetic susceptibility provides a measurement of Brownian relaxation ...

An ac dipole magnet, which can work in two accelerator energy modes of 45 GeV and 60 GeV, is reported for the LANL synchrotron. In order to reach high uniformity of magnetic field distribution in good field region, some effective measures are presented to compensate field errors due to the saturation at both edges ...

Tests have recently been performed at Fermilab in order to measure the energy losses due to eddy currents and iron and superconductor magnetization. These measurements were performed on six 1.5m long model magnets and eight 15m long full scale collider dipole magnets. AC ...

Low field magnetic measurements of a re-entrant system Ni{sub 81}Mn{sub 19} as a function of temperature are shown to exhibit two successive transitions. The ac susceptibility shows strong frequency dependence due to the frustrated spins. The freezing temperature, T{sub f}, shifts to higher temperatures with increasing frequency and ...

The properties of ac hysteresis loop of a stator tooth in a 5 hp induction motor was measured and analyzed. The load increase on the motor decreased magnetic induction, however increase the minor hysteresis loops in the high induction region. This effect caused increase in the core loss. Depending on condition of the motor, the core ...

This paper describes the design of a new test system. It is under construction now and will be used to measure the AC losses of subcable from NET conductors. A special feature of the test arrangement is that the losses will be determined while the sample carries a transport current and is at the same time subjected to changing magnetic ...

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...

Ni-W alloys are used as the substrate in the manufacture of HTS tape via the RABiTSTM process. Theoretical work has shown that the ferromagnetism in a substrate can affect the ac losses in the superconductor. This occurs in part because of the increased magnetic permeability, which alters the magnetic induction in the superconductor ...

A literature study on magnetic-inductive flowmeters for low conducting liquids was carried out and a special flowhead for this application has been constructed. The measurement on the primary head have been carried out with an ac-field and with a keyed-dc...

Preliminary results on the magnetic form fuctor of the face-centered cubic phase of metallic cobalt which indicate a deviation from spherical symmetry for its 3d electrons are given. The results of the measurements are graphically shown and tabulated. (A.C.)

A device to measure the velocity and to determine the character of a material launched in a flight tube during the execution of an experiment has been constructed. This measurement devise provides a self generating signal, is nonintrusive, compact, and ac...

AC losses in full length and 1.5 m model SSC collider dipoles were successfully measured by the direct observation of energy flow into and out of magnets during a ramp cycle. The measurement was performed by using two double-integrating type digital volt meters (DVM`s) for current and voltage ...

Magnetic poly(methyl methacrylate) nanocomposites were prepared using oleic acid coated cobalt ferrite and magnetite nanoparticles. Both nanofillers had a similar effect in shifting the glass transition temperature from that of the neat polymer. The cobalt ferrite nanocomposite had magnetic hysteresis at 2 and 300 K and the magnetite nanocomposite had ...

AC losses in full length and 1.5 m model SSC collider dipoles were successfully measured by the direct observation of energy flow into and out of magnets during a ramp cycle. The measurement was performed by using two double-integrating type digital volt meters (DVM's) for current and voltage ...

... OF THE MAGNETIZATION OF FERROMAGNETS REMAGNETIZED BY AN AC FIELD, WITH MAGNETIC HYSTERESIS TAKEN INTO ACCOUNT. ...

The ac in-phase and out-of-phase response of type II superconductors is discussed in terms of dc magnetization curves. Hysteresis in the dc magnetization is shown to lead to a dependence of the ac response on the rate at which an external field is swept. This effect allows both H/sub c/1 and H/sub c/2 to be ...

We study the correlation between the superparamagnetic blocking temperature TB and the peak positions Tp observed in ac magnetization measurements for nanoparticles of different classes of magnetic materials. In general, Tp = ?+?TB. The parameters ? and ? are different for the in-phase (?') and out-of-phase (?'') ...

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 ...

The AC dipole is a device to diagnose transverse motions of a beam. It can achieve large-amplitude oscillations without two inevitable problems of conventional kicker/pinger magnets: decoherence and emittance growth. While not the first synchrotron to operate with an AC dipole, the Tevatron can now make use of its recently upgraded BPM ...

...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...

... Title : AC IMPEDANCE MEASUREMENT OF ENVIRONMENTAL ... OF INTERFACIAL IMPEDANCE MEASUREMENT ARE ... OF THE METHOD IN ...

Two ac dipoles with vertical and horizontal magnetic field have been proposed at RHIC for applications in linear and non-linear beam dynamics and spin manipulations. A magnetic field amplitude of 380 Gm is required to produce a coherent oscillation of 5 times the rms beam size at the top energy. We take the ac ...

Substituted strontium ferrite SrFe12-xCrx/2Alx/2O19 (x=0-2.5) was prepared by sol-gel method. Ac susceptometer, and 57Fe M�ssbauer spectroscopy were used to analyze the structure, static and dynamic magnetic properties of the prepared samples. M�ssbauer spectra show that Al-Cr ions preferentially occupy the 12k sites. Magnetic ...

We analysed magnetic nanoparticle biodistribution, before and after cytokine conjugation, in a mouse model by ac susceptibility measurements of the corresponding resected tissues. Mice received repeated intravenous injections of nanoparticle suspension for two weeks and they were euthanized 1 h after the last injection. In general, ...

... 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 : ...

10 Hz sine wave and 2 Hz sawtooth AC magnetic measurements of he curved ALS Booster Dipole Engineering Model Magnet have been accomplished. Long curved coils were utilized to measure the integral transfer function and uniformity. Point coils and a Hall Probe were used to ...

Calorimetrically determined energy losses for a series of niobium and niobium-25 at.% zirconium samples carrying an ac transport current agreed with those calculated from hysteresis loops determined by dc magnetization measurements. The results of this study showed that the energy losses in ultra-high-purity annealed Nb are less than ...

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...

A magnetic vortex core in a ferromagnetic circular nanodot has a resonance frequency originating from the confinement of the vortex core. By the micromagnetic simulation including the spin-transfer torque, we show that the vortex core can be resonantly excited by an ac (spin-polarized) current through the dot and that the resonance frequency can be tuned ...

The spinel ferrite formulation referred to in the 3rd quarterly report was further experimented with. Magnetic measurements with respect to temperature and A.C. demagnetizing fields were conducted as well as shock and vibration measurements. This included...

Direction detectable static magnetic field imaging, which directly distinguishes the up and down direction of static perpendicular magnetic field from a sample surface and the polarity of magnetic charges on the surface, was demonstrated for CoCrPt-SiO2 perpendicular magnetic recording media based on a ...

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 ...

Measurements of both the ac magnetic susceptibility in melt processed and film Y{endash}Ba{endash}Cu{endash}O and frictional losses of spinning permanent magnets levitated above Y{endash}Ba{endash}Cu{endash}O are presented. A direct correlation is observed only when large susceptibility samples are studied ...

Magnetization measurements in the low frequency ac magnetic field for untwisted in situ prepared superconducting Cu-Nb composites are presented. Wires with various degrees of drawing deformation were examined. Penetration depth in the low field region increases with the deformation of the sample. Behavior of the ...

AD-A021 132 DESIGN AND EVALUATION OF A TOWED AC MAGNETIC SOURCE VEHICLE ... Design and Evaluation of a Tomd AC Fagmtic * ...

Magnetospheric phenomenon brings into play low frequency waves whose study requires to measure both AC and DC magnetic field.So far, such measure involves embedding two different instruments dedicated to both the DC and to the AC part of the field. The DC component is usually ...

Magnetic structure is studied as a function of the orientation of the easy magnetic axis with respect to ac (4 Hz) and dc magnetizing fields in specimens with various coercivities. Alternating boundary polarity was observed, and a system of magnetization distribution in the equilibrium state is ...

Time-resolved measurements of the magnetization reversal in single crystals of Mn12Ac in pulsed magnetic fields, at magnetic field sweep rates from 1.5 kT/s up to 7 kT/s, suggest a new process that cannot be scaled onto a deflagrationlike propagation driven by heat diffusion. The sweep rate ...

The field-tuned ac susceptibility of Mn12Ac single crystal has been measured as functions of temperature and frequency. Two relaxation processes appear in our measurement. One is related to the magnetic quantum tunnelling of a collective spin S = 12 by a 61 K magnetic ...

This paper described the application of an AC surface probe, similar to presently used eddy current probes, to the measurement of DC transport critical currents and critical state dissipation in high {Tc} superconductors. It has been shown that the probe can provide quantitative measurement of the full field penetration in ...

This paper described the application of an AC surface probe, similar to presently used eddy current probes, to the measurement of DC transport critical currents and critical state dissipation in high [Tc] superconductors. It has been shown that the probe can provide quantitative measurement of the full field penetration in ...

A.c. losses caused by an a.c. transport current and a transverse a.c. magnetic field during simultaneous action were measured. The loss contributions have been obtained separately. The measurements were performed on a NbTi multifilamentary wire having a CuNi matrix of low ...

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 method of using the ac Josephson current between two superconducting electrodes to probe the spin fluctuations of a magnetic insulating barrier of a junction is suggested. The dc I-V characteristic of such a junction measured as a function of both the dc bias voltage V and the magnitude of a magnetic field ...

Two photosensitizer, hematoporphyrin (HP) and 5-aminolevulinic acid (ALA) were adsorbed on the magnetic nanoparticles. In the biological test of the magnetic fluids, the hematological and blood chemical levels of rats were summarized. Also, the possibilities for hyperthermia application of the magnetic fluid were verified by ...

A outline is given of work completed in the design of a magnet for the 1- Bev electron synchrotron. Discussions are given of: measurements of the effective coercive forces of the sheet iron and cemented blocks of the yoke; the construction of the yoke and pole pieces; the design of the base for the magnet; the design of the ...

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.

The AC dipole is an oscillating dipole magnet which can induce large amplitude oscillations without the emittance growth and decoherence. These properties make it a good tool to measure optics of a hadron synchrotron. The vertical AC dipole for the Tevatron is powered by an inexpensive high power audio amplifier ...

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 ...

An ac mutual inductance bridge for magnetic susceptibility measurements of solid3He in a metallic cell at ultralow temperatures is described. A null detector for the bridge was composed of an rf-biased superconducting quantum interference device (rf-SQUID) system and a lock-in amplifier that avoided strong fields of the nuclear ...

The voltage V(sub ab) measured between two voltage taps a and b during magnetic flux transport in a type-II superconductor carrying current I is the sum of two contributions, the line integral from a to b of the electric field along an arbitrary path C(su...

The construction of Model II, an a-c 1/2-scale magnet, is described. Three a-c measurements on the model were performed to obtain information for the design of the final magnet. The measurements were made for: the flux in an iron plate placed on the ...

We have performed multiprobe experiments using a Bridgman-anvil pressure cell, adapted to trap Daphne oil as pressure medium. Resistivity, ac-magnetic susceptibility, thermopower, and ac-heat capacity of a type-I superconductor, lead, have been studied at low temperature up to 5+/-0.1 GPa. This is the first report where ac-magnetic ...

The magnetic noise of a frozen ferrofluid made of maghemite nanoparticles dispersed in glycerin is measured using a two-dimensional electron gas based quantum well Hall sensor (QWHS) with the spinning current technique. The frozen ferrofluid shows a superspin glass transition at 67 K. Below this glass transition temperature, the relation between the ...

We present here results of our study of the 5-m-long AC transmission tine model with 1 kA current capability at 77 K. Primary attention was paid to the current characteristics and AC losses in individual tapes and in the core of the cable. The losses were measured as a function of AC magnetic ...

The complex susceptibility was measured on various magnetic core-shell nanoparticle suspensions in the frequency range between 100 Hz and 1 MHz and compared to theoretical models. It is shown that the spectrum of the imaginary part of the ac susceptibility ?'' measured on aqueous suspensions of multicore magnetite ...

We have investigated the ac magnetic susceptibility and magnetic heating of aqueous suspensions of ?-Fe2O3 nanoparticles embedded in alginate hydrogel matrix and isolated ?-Fe2O3 and Fe3O4 nanoparticles coated with tetramethyl ammonium hydroxide. All three ferrofluids were characterized by measuring the dc ...

The authors measured AC losses of AC multifilamentary wires (NbTi and Nb{sub 3}Sn) and a cable of (6+1) configuration due to transport currents in an AC external magnetic field at 50Hz. They also studied the stabilities of the NbTi and Nb{sub 3}Sn wires and the cable. The Nb{sub 3}Sn ...

The voltage V{sub ab} measured between two voltage taps a and b during magnetic flux transport in a type-II superconductor carrying current I is the sum of two contributions, the line integral from a to b of the electric field along an arbitrary path C{sub s} through the superconductor and a term proportional to the time rate of change of ...

The voltage V ab measured between two voltage taps a and b during magnetic flux transport in a type-II superconductor carrying current I is the sum of two contributions, the line integral from a to b of the electric field along an arbitrary path C s through the superconductor and a term proportional to the time rate of change of ...

ac permeability and harmonic-generation measurements have been carried out on a pulsed-laser-deposited YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} thin-film sample. The dependence of the inductive and dissipative components of the permeability on the ac magnetic-field amplitude indicates the absence of intergranular ...

In-phase ?n? and out-phase ?n? components of nth harmonics of AC susceptibility with measuring parameters of a DC magnetic field Bdc, an amplitude Ba and a frequency f of the superimposed AC magnetic fields give substantial information of the superconducting properties. In low-Tc metallic ...

AC loss can be a significant problem for any applications that utilize or produce an AC current or magnetic field, such as an electric machine. The authors investigate the electromagnetic properties of high temperature superconductors with a particular focus on the AC loss in superconducting coils made from YBCO ...

A radiation-measuring device is described having an a-c output. The apparatus has a high-energy particle source responsive to radiation flux disposed within a housing having a pair of collector plates. A potential gradient between the source and collector plates causes ions to flow to the plates. By means of electrostatic or ...

An AC dipole magnet produces a sinusoidally oscillating dipole field with frequency close to betatron frequency and excites large sustained oscillations of beam particles circulating in a synchrotron. Observation of such oscillations with beam position monitors allows direct measurements of a synchrotron's nonlinear ...

The RHIC vertical ac dipole was installed in the summer of 2001. The magnet is located in the interaction region between sector 3 and sector 4 common to both beams. The resonant frequency of the ac dipole was first configured to be around half of the beam revolution frequency to act as a spin flipper. At the end of the RHIC 2002 run, ...

A magnetic field harmonically varying in time (to probe the sample) and a lock-in technique (to register the sample response sensed by a pick-up coil) are widely used for characterizing superconductors. Measuring the temperature dependence of the complex AC susceptibility is the most common procedure of this type. This paper reviews ...

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 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 ...

Specific heat (Cp) and magnetocaloric effect (MCE) are useful tools in the experimental determination and understanding of the temperature-magnetic field phase diagram of materials. While previous studies are mostly limited to measurements in DC magnets, here we discuss a new AC calorimeter to ...

Results of an investigation of Pa/sup 231/ decay are presented. Measurements were performed with magnetic alpha and beta spectrometers and a spectrometric arrangement for gamma measurements. Twenty monoenergetic alpha lines were detected in the alpha spectrum. Ten of these lines were established for the first time. ...

A magnetic study of iron sorbitol, an iron-containing drug to treat the iron deficiency anemia is presented. Transmission electron microscopy reveals that the system contains nanometric particles with an average diameter of 3nm whose composition is close to two-line ferrihydrite. The characterisation by magnetisation and AC susceptibility ...

Determining the low-temperature dependence of the specific absorption rate (SAR) of magnetic nanoparticles under alternating magnetic fields with amplitudes and frequencies similar to those used in applications such as magnetic fluid hyperthermia, becomes essential when theoretical expressions fail to extrapolate the behavior of ...

Multifilamentary Bi2223 tapes are exposed to the longitudinal magnetic field as well as the transverse one in some electrical power apparatuses such as multilayer power transmission cables. Here, we define the longitudinal and transverse magnetic fields as the field components parallel and perpendicular to the tape axis, respectively. If the ...

DC and AC magnetic measurements were carried out to clarify the difference in the magnetic ground state depending on the kinds of Z element used in the martensite phase in Ni�Mn�Z (Z = In, Sn and Sb) off-stoichiometric Heusler alloys. Magnetic field cooling effects were observed in the DC ...

DC and AC magnetic measurements were carried out to clarify the difference in the magnetic ground state depending on the kinds of Z element used in the martensite phase in Ni-Mn-Z (Z = In, Sn and Sb) off-stoichiometric Heusler alloys. Magnetic field cooling effects were observed in the DC ...

We present two options for implementing a pair of AC-dipoles in RHIC for spin flipping, measuring linear optical functions and nonlinear diagnostics. AC-dipoles are magnets that can be adiabatically excited and de-excited with a continuous sine-wave in order to coherently move circulating beam out to large betatron ...

Magnetization, ac-susceptibility, and muon spin-relaxation (?SR) measurements have been performed in neutral phthalocyaninato lanthanide ([LnPc2]0) single-molecule magnets in order to determine the low-energy levels structure and to compare the low-frequency spin excitations probed by means of macroscopic ...

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 ...

In particle accelerators quasi-DC superconducting magnets are used to keep particles in desired tracks. The needed rapid field variations of these high energy magnets require large energy bursts. If these bursts are taken from and fed back to the utility grid, its voltage is distorted and the quality of the electricity degrades. In addition, these bursts ...

An improved full scale bending magnet for the Energy Doubler was cooled down with a prototype satellite refrigerator and its characteristics were measured. Quenches were intentionally induced on this magnet below 40 kG using a heater, and the quench behavior was investigated from the viewpoint of system safety. The first self-induced ...

The magnetic properties of several powder samples of the high-Tc superconductors Hg-1212 and (HgTl)-1212 are investigated by means of ac and dc susceptibility measurements. The temperature dependence of irreversibility fields is determined up to magnetic fields of 14 T. It can be described in the framework of a ...

Experiments were conducted to further investigate the effect of 60-Hz cyclotron-resonance exposures on rats performing on a multiple FR-DRL schedule. The previously reported temporary loss of DRL baseline response, when measured as a function of A.C. magnetic intensity, was found to have a threshold. Utilizing the component of ...

Superconducting quantum interference (SQUID) magnetometers remain as the most sensitive instruments to measure magnetic properties. However, the ready availability and rapid improvements in the sensitivity of magnetic field sensors based on giant magnetoresistance (GMR) effect combined with their low cost and ability to operate at room ...

The 3 GeV Booster synchrotron for TRIUMF's KAON Factory will need 24 dipole magnets each 3.0 m long operating with a resonant power system designed to give a 50 Hz ac field superimposed onto a dc field. The maximum and minimum field levels are 1.118 and 0.295 T respectively. In this paper the magnet design is presented and ...

A sensorless field oriented control scheme for surface mount permanent magnet ac (PMAC) motor with split phase stator windings is presented. This motor is obtained by splitting the phase windings of a conventional three phase motor. The six-phase motor, however is run as a three-phase motor by connecting the split phase stator windings in series, while the ...

The results of comparsive magnet field measurements on identical electromagnets made of four different steels (U. S. Steel Transformer 72 and Transformer 52 and Allegheny Ludlum Transformer Grace C and Silectron are presented. Particular attention is directed to the high-field (~9.5 kiloguass) characteristics. Also ...

The effect of weak dipolar interactions (DIs) between Ni nanoparticles (NPs) in samples with different Ni concentrations was investigated by performing a detailed characterization of their structural and magnetic properties. From the determination of several physical parameters of Ni NP assemblies, it was found that the ac and dc ...

A matched pair of curved integral coils has been designed, fabricated and calibrated at Lawrence Berkeley Laboratory for measuring Advanced Light Source (ALS) Booster Dipole Magnets. Distinctive fabrication and calibration techniques are described. The use of multifilar magnet wire in fabrication integral search coils is described. ...

DC bias is normally found in conventional measurements of electrically detected magnetic resonance (EDMR). Usually, electrodes are formed on the sample surface to make ohmic contacts for detecting changes in the electrical characteristics of the sample material. Thus, destructive procedures are required to detect the EDMR signal of bulk material with such ...

The low-field dependence of electrical power absorption and ac susceptibility-temperature measurements are performed on three ceramic superconductors of the Tl2Ba2CaL-1CuLO4+2L family using modulated and direct microwave and ac methods. Below a critical temperature all samples exhibit a large increase in ac and ...

The low-field dependence of electrical power absorption and ac susceptibility--temperature measurements are performed on three ceramic superconductors of the Tl{sub 2}Ba{sub 2}Ca{sub {ital L}{minus}1}Cu{sub {ital L}}O{sub 4+2{ital L}} family using modulated and direct microwave and ac methods. Below a critical temperature all samples ...

Recent magnetic measurement activities at LBL have been concentrated in two separate areas, electro-magnets and permanent magnets for the Advanced Light Source (ALS), and superconducting magnets for the Superconducting Super Collider Laboratory (SSCL). In this paper a survey of the many ...

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 ...

This paper proposes a method to measure the ac magnetic field distribution in close proximity to a coplanar waveguide (CPW) employing a cantilever tip fabricated for magnetic force microscopy as a sensor. Almost the entire surface of the tip is coated with a magnetically hard film (Co-Cr-Pt), ...

In this work, we develop a platform for assaying biomolecules involving the measurement of alternating current (ac) magnetoreduction of magnetic reagent mixed with a detected sample. The magnetic reagent contains magnetic nanoparticles coated with a given kind of antibody, which associates with ...

The first part of the paper presents the results of measurements on torque and force irregularities of running reaction wheels. Six different, current technology European wheels, both with ball- and magnet bearings, and with d.c. and a.c. drive motors are...

Five subtasks are reported on: ac electric and magnetic fields, dc fields and ion measurements, gaseous dielectrics research (SF/sub 6/ mixtures), interfacial phenomena in liquids, and nanosecond breakdown in power system dielectrics. (DLC)

Metal - superconductor (YBCO) systems have been prepared and characterized by resistivity, ac susceptibility and dc SQUID magnetic moment measurements. The silver composites showed superconducting transition for all the composites processed and the superc...

Jul 30, 2011 ... Dr. Susumu K. Kokubun, Principal Investigator, University of Tokyo, kokobun@ stelab.nagoya-u.ac.jp. Dr. Mario H. Acuna, Co-Investigator, NASA ...

The nuclear states amenable to laser studies are reviewed with respect to their structure. Systematic predictions are made, e.g., for magnetic moments of parity-mixed intrinsic orbitals in the Ac isotopes and for the shape of the known high-spin isomers in the Pb region.

The nuclear states amenable to laser studies are reviewed with respect to their structure. Systematic predictions are made, e.g., for magnetic moments of parity mixed intrinsic orbitals in the Ac isotopes and for the shape of the known high spin isomers in the Pb region.

The nuclear states amenable to laser studies are reviewed with respect to their structure. Systematic predictions are made, e.g., for magnetic moments of parity-mixed intrinsic orbitals in the Ac isotopes and for the shape of the known high-spin isomers i...

The instrument described is designed to measure homogeneous magnetic fields in the range -0.5 T to +0.5 T with a precision of 10 sup -4 and a resolution of 5 mu T. This is accomplished, on a single range, by the use of solid-state components and a.c. tech...

The power supply design of the (gamma)(sub f) - jump system in FNAL Main Injector uses a resonant circuit. A critical design parameter is the ac losses of the beam tube in a pulsed quadrupole. This paper gives an analysis to this problem. An equivalent ci...

This note describes an a.c. comparator circuit which uses a Hall generator for measurement of d.c. magnetic fields. The accuracy is to 1% between 180 and 12000 gauss. (Author)

Although much research has been conducted concerning the losses of high-{Tc} superconductors, very little has concentrated on the self-field losses in an actual magnet arrangement. The coils studied in this work were designed for use as actual magnets in an industrial application. Self field loss measurements were made upon tape-wound ...

Rapid Cycling Synchrotron (RCS) is a key component of China Spallation Neutron Source (CSNS). It accumulates and accelerates protons to design energy of 1.6 GeV at the repetition rate of 25 Hz, and extracts high energy beam to the target. Performance of a high energy and high intensity accelerator depends crucially on the field quality of magnets employing to guide and focus a ...

High temperature superconducting (HTS) cables with RE-123 coated conductors are expected to lower AC loss compared to that with BSCCO cable. Sumitomo Electric Industries, Ltd. (SEI) has been developing not only BSCCO wires but also RE-123 coated conductors. Recently, SEI has developed a RE-123 coated conductor with a new type of textured metal substrate (Clad-type). The ...

... Title : THE APPLICATION OF MAGNETIC FIELDS TO TIG WELDING ARCS-- PART I - TRANSVERSE AC MAGNETIC FIELD. Corporate Author : ...

Results of magnetic measurements are presented for a Ho-based bulk metallic glass, which shows similarities and differences with conventional spin glasses (SGs), and significant differences with weak random magnetic anisotropy (RMA) systems. Both ac and dc magnetic ...

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 ...

the current through fixed resistors fed with a measured AC voltage. Such a sensor is also sensitive to stray Strategy for Locating and Eliminating Sources of Mains Frequency Stray Magnetic Fields J. B. Pawley HVEMEliminatingSourcesof Mains-frequency Stray Magnetic Fields It is generally recognized that stray ...

DMSA-coated magnetic nanoparticles have been used for drug delivery, in particular to transport cytokines towards an induced tumour in a murine model. In this work, the use of transmission electron microscopy and AC magnetic susceptibility measurements of the tissue have allowed the detection of the particles ...

An organometallic single-ion magnet is synthesized with only 19 non-hydrogen atoms featuring an erbium ion sandwiched by two different aromatic ligands. This molecule displays a butterfly-shaped hysteresis loop at 1.8 K up to even 5 K. Alternating-current (ac) susceptibility measurement reveals the existence of two thermally activated ...

Low-temperature and high-temperature superconductors are used in liquid helium (LHe) as magnets and in other applications. AC transport current loss study is important for the use of these superconductors in alternating current regimes. The measurement of AC transport current loss under LHe conditions requires a ...

The transport properties and the dynamics of the flux lines have been investigated on YBaCuO melt textured by measuring the AC susceptibility harmonics as function of the temperature, at different frequencies and amplitudes of the AC magnetic field. The interpretation of the behavior of the experimental curves has ...

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 ...

The purpose of this study was to measure the average anterior commissure (AC) volume of normal subjects in their 20s or 40s and to determine the effects of gender and age on AC volume. Magnetic resonance brain images were obtained for 93 people in their 20s (46 men, 47 women) and 87 in their 40s (36 men, 51 women). ...

We present a novel detection scheme for magnetic nano and micro particles using a magnetic force microscope (MFM) that allows for the local measurement of AC magnetic susceptibility. The method makes use of the nonlinearities in the magnetic response of a particle that come ...

... 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 ...

The magnetic field dependence of the maximum dc Josephson current and of the ac Josephson-effect-induced step structure has been measured for sputter Nb--NbO/sub x/--Pb Josephson junctions and found to be in very good agreement with theoretical predictions, even for junctions made with 'dirty' Nb thin films.

The low-temperature specific heat of single-crystal samples of superconducting MgCNi3 with typical dimensions 200 ?m were measured for the first time. A computer controlled ac microcalorimeter using an optical fiber and an infrared light-emitting diode as the heat source was used down to 2 K at magnetic fields up to 8 T. The specific ...

The AC susceptibility (X(prime), X(double prime)) has bee measured in a single crystal of the organic superconductor K-(ET)(sub 2)Cu(NCS)(sub 2) ((Tc) = 9.5 K) as a function of the DC magnetic field, for several frequencies (10 (sup 2) Hz

The E-J characteristics were measured for a YBCO coated-conductor by using AC inductive method of third-harmonic voltage. The results are compared with the measurements obtained by the four probe method and DC relaxation method of magnetization. The results by three kinds of measurements meet ...

A method is described for calorimetric ac-loss measurements of high-T(c) superconductors (HTS) at 80 K. It is based on a technique used at 4.2 K for conventional superconducting wires that allows an easy loss measurement in parallel or perpendicular external field orientation. This paper focuses on ac loss ...

A method is described for calorimetric ac-loss measurements of high-Tc superconductors (HTS) at 80 K. It is based on a technique used at 4.2 K for conventional superconducting wires that allows an easy loss measurement in parallel or perpendicular external field orientation. This paper focuses on ac loss ...

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 ...

The AC susceptibility (X{prime}, X{double_prime}) has bee measured in a single crystal of the organic superconductor K-(ET){sub 2}Cu(NCS){sub 2} ({Tc} = 9.5 K) as a function of the DC magnetic field, for several frequencies (10 {sup 2} Hz AC fields (l{mu}T