Influence Of Dc Magnetic Field Research Articles

Magnetic field effect on silicon based solar cells

In this study, the impact of DC magnetic field on the power production, open-circuit voltage, photocurrent density and fill factor of a silicon photovoltaic (PV) cell/module is assessed. In this regard, the influence of DC magnetic field is first evaluated by presenting a novel theoretical electromagnetic force analysis formulating essential basis and concepts. Then, experimental measurements and data obtained from several tests conducted by arranging two different setups are given that verify theoretical results. In theory and practice, it is shown that depending on the direction of a DC magnetic field applied to a monocrystalline or polycrystalline silicon PV cell/module, different effects are observed. In detail, when the DC magnetic field points along the junction electric field of the silicon PV cell(s), i.e., the directions of the DC magnetic field and junction electric field are same or opposite, it has no effect on the parameters of the silicon PV cell/module. But, the power production, open-circuit voltage and photocurrent density of the silicon PV cell/module decrease when the DC magnetic field points in the other directions. Moreover, the reduction in the power production, open-circuit voltage and photocurrent density reaches its maximum when the DC magnetic field is applied in the direction perpendicular to the junction electric field. The above-mentioned points concluded in this paper are the contributions of this work to the state of the art of the topic.

Temperature Estimation of Lithium-Ion Battery Based on an Improved Magnetic Nanoparticle Thermometer

Lithium-ion batteries are widely used in new energy vehicles, especially electric vehicles. Temperature estimation is very important for battery life and safety. However, current temperature measurement methods cannot accurately measure the battery internal temperature. In this paper, a new method for battery temperature estimation based on an improved magnetic nanoparticle thermometer (MNPT) is proposed. The influence of dc magnetic field on temperature accuracy of a MNPT is firstly studied, the optimal dc magnetic field is found out under limitation of maximum temperature sensitivity and minimum temperature error, a new model of an improved MNPT is also established based on the ratio of first and second harmonics, and then the Lithium-ion battery temperature is estimated by use of the improved MNPT, the simulation and experiment results show that the improved MNPT can accurately estimate the battery internal temperature, which provides a new method for monitoring battery temperature of a new energy vehicle.

Numerical Simulation of Inductive Measurement Method for Critical Current Density in HTS Thin Film: Influence of DC Magnetic Field on Accuracy

A numerical code has been developed for analyzing the shielding current density in a High-Temperature Superconducting (HTS) thin film. By using the code, the inductive method has been successfully reproduced even when the <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">B</i> -dependence of the critical current density is taken into account. The results of computations show that the outer radius of the coil must be nearly equal to or less than the sample radius to ensure the sufficient accuracy of the inductive method. Furthermore, Mawatari's conjecture on the third-harmonic voltage generation is justified by use of the numerical simulation.

Effective dielectric and magnetic properties of (Ni–Co–Cu)ferrite/BTO composites

Particulate composites of Ni 0.93Co 0.02Cu 0.05Fe 2O 4 as a ferrite phase and BaTiO 3 as a ferroelectric phase were synthesized by normal ceramic method with variations of mole percentage. The structural analysis of both the constituent phases and their composites carried out by X-ray diffraction (XRD) pattern showed the cubic spinel structure for ferrite phase and tetragonal perovskite structure for ferroelectric phase. The phase percentage after final sintering is well consistent with the mole percentage of constituent phase used for synthesis. The surface morphological studies were carried out to calculate average grain size. The effect of temperature on dielectric properties of composites and their constituent phases is discussed. With increasing content of BaTiO 3 in composites, the dielectric constant decreased and the Curie temperature shift towards the low temperature side. The high value of dielectric constant indicates the applicability of these composites as a capacitor material. The hysteresis measurements were carried out under the influence of dc magnetic field to determine the saturation magnetization, remanent magnetization and magnetic moment for all the composites. The variation in magnetic behavior with the composition of constituent phases was measured as a function of the applied dc magnetic field.

Influence of DC Magnetic Field on AC Loss of YBCO Coated Conductor with Ferromagnetic Substrate

Influence of DC Magnetic Field on AC Loss of YBCO Coated Conductor with Ferromagnetic Substrate

Modification of Bubble-driven Liquid Metal Flows under the Influence of a DC Magnetic Field

The paper presents an experimental study devoted to a bubble-driven liquid metal flow under the influence of an external DC magnetic field. Experiments have been performed on laboratory scale at ambient temperature using the ternary alloy GalnSn. Measurements of the bubble-driven liquid metal flow have been carried out using the Ultrasound Doppler Velocimetry (UDV). The magnetic field has been imposed either in vertical direction parallel to the main bubble motion or in horizontal direction, respectively. Whereas a global damping of the flow field was generally observed in the case of the vertical aligned magnetic field, the application of a horizontal magnetic field can provoke a restructuring of the flow pattern with strong, non-steady vortical structures. This finding could attain relevance for metallurgical engineering, for instance the control of the mould flow during the continuous casting of steel by means of an electromagnetic brake.

Nonlinear microwave response of Bi-Sr-Ca-Cu-O single crystal at microwave frequencies

The third harmonic generation by monocrystalline Bi-Sr-Ca-Cu-O under the influence of high microwave power at frequency 9 GHz has been investigated. Two modes of operation have been found. For comparatively weak driving forces we observed that dc magnetic field significantly increased amplitude of the third harmonic hysteresis when the dc magnetic field was changed, and different amplitude of the third harmonic for zero- and nonzero-field cooled states. All these peculiarities could be explained in the framework of phenomenological Ginzburg-Landau theory if one takes into account the higher spatial derivatives of the order parameter. At strong driving forces we found only weak influence of dc magnetic field without any hysteresis. It probably indicates that the harmonic generation for these powers is the result of creating and destroying vortices by a high-frequency field.

Group theoretical approach to eigenvalue problems of symmetrical multiports with gyrotropic media

Eigenvalue problems of symmetrical multiports with gyrotropic media are considered. It is shown that the perturbation method known in quantum mechanics may be used for symmetrical structures with gyrotropic media in order to determine the influence of dc magnetic field on the eigenvalue degeneracy. In gyrotropic structures, an additional degeneracy may appear which is not predicted by the unitary subgroup. The eigenvalue equation for [S]-matrix in the case of magnetic groups of the third category and the problem of calculation of eigenvectors for transposed matrix are investigated. The theory is illustrated by some examples.

Magnetostrictive deformation of YBa 2Cu 3O 7−δ during S-N transition in magnetic field

The XRD method has been used to investigate the influence of dc magnetic fields on the behavior of crystal lattice parameters of ceramic superconducting specimens YBa 2Cu 3O 7−δ with δ ∼ 0.5 at T < T c [ T c ∼ 48 K, H c2(4.2 K) ∼ 50 kOe]. At T < T c and H ∼ H c2 we at first observed the anisotropic jumps of the crystal lattice parameters.

Influence of a dc magnetic field on proximity measurements with eddy-current gauges

The influence of an external dc magnetic field on proximity measurements with an eddy-current gauge was studied with iron, stainless steel, and copper samples. The magnetic flux density was varied from 0 to 1 T and the direction of the external field was either perpendicular or parallel to the probe axis. Measurements show that with an iron sample, a magnetic field perpendicular to the axis has a tremendous influence on the gauge’s response, but practically no influence at all when parallel to the axis.