Research Article   |   Volume 5, Issue 1 DOI: 10.35840/2631-5068/6521

Anti-Reciprocal Motional Impedance and its Properties

Noori Kim and Jont B Allen
Abstract

The concept of motional impedance (Zmot) was first suggested by Arthur E. Kennelly in 1912a. It is a unique characteristic of every electro-mechanical system such as earphones, loudspeakers, hybrid cars, etc. The Zmot is defined as the component of the electrical impedance proportional to the output velocity. From measurements of the electrical impedance at the electrical input, one may accurately estimate the mechanical or acoustic load impedance. This property alone makes it worth of study.

PDF   |    Full Text  |   EPUB   |   XML

Research Article   |   Volume 5, Issue 1 DOI: 10.35840/2631-5068/6520

Effect of Lattice Size on the Critical Temperature of Ising Nanofilms and Nanotubes on the Square Lattice: Cellular Automata Simulation

Nabi Javadi
Abstract

Lattice size dependency of critical temperature of Ising nanofilms and nanotubes on the square lattice have been investigated Using Cellular Automata simulation approach. The obtained values of critical temperature for single-layer nanofilm on the infinite size of lattice is equal to 2.36, the corresponding value for single-layer nanofilm on the honeycomb lattice was 1.45. The effects of length and diameter of nanotube on the critical temperature were also studied.

PDF   |    Full Text  |   EPUB   |   XML

Research Article  |   Volume 5, Issue 1 DOI: 10.35840/2631-5068/6519

Electrodynamic Concentration of Non-ferrous Metallic Particles in the Moving Gas-powder Stream: Mathematical Modeling and Analysis

Yuze Huang, Mir Behrad Khamesee and Ehsan Toyserkani
Abstract

This paper presents theory, modeling, and analysis of a novel electrodynamic concentration approach for submillimeter-sized conductive metal particles focusing in moving gas-powder stream. Such method is of particular interest in blown-powder feeding fabrication industry (e.g., powder-fed additive manufacturing) to generate a tightly focused powder stream.

PDF   |    Full Text  |   EPUB   |   XML

Research Article  |   Volume 5, Issue 1 DOI: 10.35840/2631-5068/6518

Simulated Thermomagnetic Properties of Dyal2, Hoal2 and Eral2 Compounds in Comparison with the Results for Tbal2, Gdal2 and Smal2 Calculated by ATOMIC MATTERS MFA Computation System

R Michalski and J Zygadlo
Abstract

We present the results of calculations of magnetic properties of 3 compounds from Laves phase C15 family: DyAl2, HoAl2 and ErAl2 performed with a new computation system called ATOMIC MATTERS MFA. We compare these results with the recently published results for TbAl2, GdAl2 and SmAl2. The calculation methodology was based on the localized electron approach applied to describe the thermal evolution electronic structure of rare-earth R3+ ions over a wide temperature range and to compute magnetocaloric effect (MCE).

PDF   |    Full Text  |   EPUB   |   XML

Research Article  |   Volume 5, Issue 1 DOI: 10.35840/2631-5068/6517

Optimization of the Absorption of Radiation in NiZnMn Ferrite by Electron-Phonons in Composites of Dielectric Polymer and Crystals

Régia C Pessoa, Ricardo S Nasar, Marinalva C Nasar and José H Araújo
Abstract

Ferrites were synthesized with the formula Ni0.5-xZn0.5MnxFe2O4 for x = 0, 0.3, and 0.5 mol%, respectively. The magnetic characteristics and the absorption of radiation of the powder-epoxy composite were investigated. X-ray diffractometry, XRD and scanning electron microscopy, SEM, were performed. The magnetic hysteresis was investigated by vibrating-sample magnetometer, VSM, and the Bohr magneton was compared with the reflectivity measurements of the composites. The Bohr magneton of 6 μB/cell for NiZn and 7.5 μB/cell for NiZnMn, respectively, show the effect of inversion between theoretical and experimental results.

PDF   |    Full Text  |   EPUB   |   XML

Research Article  |   Volume 5, Issue 1 DOI: 10.35840/2631-5068/6516

The Simulation and Optimization of the Magnetic Circuit for Magnetorheological Damper

Benxiang Ju
Abstract

Design and analysis of the magnetic circuit is an important step in design of magnetorheological (MR) damper. Magnetic Field-dependent damping force is affected by the construction of magnetic circuit and related parameters. In this paper, a kind of integrated piston assembly was presented and analyzed. The effect of several factors on performance of the magnetic circuit was calculated and studied, such as the different-stage coil, the same and opposite direction of coil, the width of damping channel, the diameter of core, bypass, and so on.

PDF   |    Full Text  |   EPUB   |   XML



Volume 5 Issue 1

© 2020 VIBGYOR ePress. All Rights Reserved.