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The influence of the magnetic gradient tomography systems instability on the reconstruction quality is investigated. The simulation circuit of the tomograph was used to calculate the signal of free induction recession from the conditional object — the real tomogram. After that, the restoration was performed using an array of calculated signals. The visual and quantitative comparison criteria, including...
Non-stationary excitation of six electrical dipoles on a plane that form the correct hexagon is considered. The problem is solved analytically in time domain by the vector potential method. The radiated non-stationary field is compared with the field of one dipole with the same total excitation current and the equivalent length.
A detailed investigation of the composition dependences of magnetoresistance for polycrystalline Bi1−xSbx solid solutions in a concentration range x = 0 − 0.07 was performed at 300 K in weak and strong magnetic field. It was shown that the composition dependences of magnetoresistance are clearly expressed nonmonotonic type. The presence of concentration anomalies of magnetoresistance was confirmed...
This paper reports empirical evidence on using an augmented reality based simulator in a face-to-face learning environment. The simulator was used in a Physics course to allow students (N=112) to gain insight into the way in which magnetic fields interact with charged particles by watching in 3D the corresponding trajectories. Results suggest that augmented reality technology has a positive impact...
Control of light by an external magnetic field is one of the important methods for modulation of its intensity and polarization. Magneto-optical effects at the nanoscale are usually observed in nanostructured hybrid materials or magnetoplasmonic crystals. In this work, we combine the advantages of all-dielectric resonant nanostructures and magnetic materials for creating compact active magneto-optical...
Student who intends to pursue bachelor engineering program at Universiti Tenaga Nasional (UNITEN) must undergo a one-year foundation program. For mechanical (ME) and electrical (EE) engineering students, Physics courses are among the main subjects that they need to take during their foundation study. Physic 1 generally focuses more on mechanical topics, while Physics 2 focuses more on electrical topics...
For the purpose of plotting the H-T diagram for MgB2 granular superconductors, the behavior of electrical resistivity-versus-temperature dependences were studied at ∼ 35 to ∼ 45K in external magnetic fields with magnetic field strengths Hext up to ∼ 2kOe. The effect of increasing the superconductivity transition width ΔTc at increased Hext has been revealed. A model has been developed for superconductivity...
We present a comprehensive theoretical and numerical study of the stochastic rotational motion of a high anisotropic ferromagnetic nanoparticle in a viscous carrier driven by a time-periodic field. The effects of energy absorption of circularly and linearly polarized fields are analyzed. The analytical expressions and numerical data for the probability density and the power loss are compared for different...
Bulk films and heterostructures based on HgCdTe compounds can be engineered to fabricate “gapped-at-will” structures. Therefore, 1D [1], 2D [2] and even 3D [3] massless particles can be observed in topological phase transitions driven by intrinsic (quantum well thickness, Cd content) and external (magnetic field, temperature or pressure) physical parameters. So far, the phases of 2D [1] and 3D [4]...
Axial magnetic field (AMF) contact structures are often adopted for promoting interruption ability in the vacuum interrupters. After current-zero, there still exists residual magnetic field in the contact gap result from the eddy current. As a consequence, the plasma dissipation process which recovers the dielectric strength of the vacuum interrupter, was influenced immediately in the post-arc phase...
We report the observation of multiple polariton branches in an ultra-strongly coupled system of Landau level transitions in strained Ge quantum wells (sGe QWs) and a THz metamaterial. The sGe QW system shows narrow spin-split heavy-hole cyclotron resonances and thus leads to multiple cyclotrons. The coupled system can be described by an expanded ultra-strong coupling Hamiltonian including all oscillators...
The organic chip-scale physics package for MEMS atomic clocks with function of thermal management and magnetic field control is presented. The organic package consists of MEMS alkali vapor cell, vertical-cavity surface-emitting laser (VCSEL), photo-diode, and rigid-flexible organic frame for package. The alkali vapor cell is fabricated by conventional bulk-micromachining. For thermal management of...
There is quantization noise influence discussed in this paper. There is shown error for density and mobility estimating by mobility spectrum method for quantized signal. The digital filter processing is proposed for reducing this error. The proposed method is given better results than signal interpolation.
Bi2Se3 is one of the promising topological insulator (TI) materials, which have both helical spin polarization and strong spin-orbit coupling (SOC). In this work, high quality Bi2Se3 thin films were grown on c-plane sapphire (Al2O3) substrates by molecular beam epitaxy (MBE). The central part of the Bi2Se3 layer was covered with a permalloy (Ni80Fe20) layer by ion-beam sputtering (IBS) with a shadow...
Metamagnetism, a sudden increase in the magnetization of a material with a small change of external magnetic field, are calling more attentions because of their rich magnetic phenomena and scientific significance [1][2]. There are quite different physical causes for different types of metamag-nets. In this work, metamagnetism has been found in arc-melting Sm(Ni0.5Fe0.4Cu0.1)7. The physical property...
Recently, magnetic nanoparticles are gaining interest for use in magnetic biomedical applications, such as magnetomechanical cell destruction and magnetic hyperthermia. Biofunctionalized NiFe microdiscs, with the application of a low-frequency alternating magnetic field, have been used to demonstrate magnetomechanical cancer-cell destruction by generating an oscillatory motion that transmits a mechanical...
The performance in magnetic field (B-field) of a DC-DC converter ad hoc designed for LHC operation has been evaluated. The tests have been carried out at the Laboratorio Acceleratori e Superconduttività Applicata (LASA), in Milan (Italy), in the first months of 2014 and the experimental results are here presented and discussed. The ability to operate in hostile environment of the tested DC-DC converter...
High-current circuit breakers based on vacuum interrupter (VI) represent an alternative type of switching equipment suitable for operation under severe climatic conditions. Such devices can offer a number of other technological or environmental benefits compared to the currently used ones. Bringing the performance of the VI-based circuit breakers to the level of ∼3 kA nominal currents, ∼40 kA rate...
Electron and ion flows coupled with plasma and magnetic field inhomogeneity result in a number of instabilities in Hall thrusters and other systems with ExB drift, such as magnetrons and Penning discharges. The interaction of plasma density and magnetic field gradients, low-hybrid, collisional, and ionization driven instabilities are investigated within the reduced nonlinear fluid model taking into...
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