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Feb 23, 2021Open AccessArticle
The purpose of the work was the correct experimental discovery of the effect of “weak” gyrotropy of the “nongyrotropic” transparent crystals. The original experiment was based on the study of the light transmission (T) of the system: Polarizer—wedgeshaped Crystal’s sample—Analyzer (orthogonal to Polarizer). It was shown that: if the optical axis of the crystal is parallel to the rib of the wedge and to the polarization of the linearpolarized incident light, then the transmission T of the syst...
Jul 14, 2020Open AccessArticle
Developing new absorbing and shielding materials with a large band of frequency and high performance to allow the coexistence of the electronic components without the damaging electromagnetic interference (EMI) is needed. For this reason, this work is focused on polycaprolactone (PCL) and rice husk particles (RHP) prepared at filler percentage of 0 to 60 wt% leading to the formation of PCL/RHP composites. The RHP was prepared by washing with water, acetone, sundried and grinded in a milling mac...
Jun 12, 2020Open AccessArticle
The main subject of this study is to adapt the fractional step method to the resolution of the radiative heat equation. This interest is justified by the intervention of the flow radiation in the modeling of several physical phenomena. Since this differential equation is actually difficult to solve, a new method has to be used to solve the equations that govern the heat transfer in the porous medium. The results have been limited to the less fine parametric study and have brought us to the concl...
May 26, 2020Open AccessArticle
In electromagnetic welding (EMW) process, optimization of process parameters is very important aspect. Optimization process leads to generation of mechanically and metallurgically sound interface weld without overstressing tool coil and electromagnetic welding equipment. This work investigates the effect of four important process parameters (Magnetic field in coil ID, Frequency of current pulse, Taper angle of SS316 L (N) plug and Standoff distance between D9 tube and SS316 L (N) plug) on weld...
May 26, 2020Open AccessArticle
In order to improve the reliability of busbar protection, a new fast busbar protection algorithm based on active power and extreme learning machine is proposed. By performing Stransformation on the fault voltage and current traveling wave, the active power amplitude within 0.1 ms after the fault is obtained. Simulate different fault types in the busbar area and build a bus fault feature vector sample set. The intelligent model of fault learning of extreme learning machine is established, and th...
Apr 29, 2020Open AccessArticle
In this paper, a new iterative formula for solving ordinary and partial nonlinear differential equations is derived based on the combination between Bernstein’s polynomial and the Adomian decomposition formula. The solution of the differential equations has been transformed into iterative formulas that find the solution directly without the need to convert it into a nonlinear system of equations and solving it by other numerical methods that require considerable time and effort. The obtained re...
Nov 07, 2019Open AccessArticle
In this paper we take a new approach to solving the RayleighSommerfeldSmythe equation for a telescope’s optical impulse response to a monochromatic point source spherical wave radiating outward from the origin in the object plane. Two cases are covered: 1) the point source at the origin in the telescope’s nearfield object plane; 2) the point source at the origin in the farfield object plane as is the case wi ...
Aug 27, 2019Open AccessArticle
Neutron pairing energies of some of the finite nuclei have been calculated to understand how the neutron pairing changes as the neutron and proton numbers change from odd to even values in isotopes. How its value changes for even (N)  even (Z), even (N)  odd (Z), odd (N)  even (Z) and odd (N)  odd (Z) nuclei has been brought out. The values of pairing energies have been calculated for ligh ...
Aug 27, 2019Open AccessArticle
Electrical transport properties of superconducting materials are a widely studied area in superconductivity. In this study, the role of holes in determination of resistivity, Hall coefficient and Hall angle has been explored using a twoband model due to coexistence of holes and electrons in highTc YB2Cu3O7δ and Bi2Sr2CaCu2O8δ. The results obtained from this study show that hole resistivity decreases with increase in the ratio ...
Aug 26, 2019Open AccessArticle
A plasma has been defined as a quasineutral gas of charged particles showing collective behaviour. Plasmas can support waves depending on the local conditions, the presence of external electric and magnetic fields. A characteristic property of plasmas is their ability to transfer momentum and energy via collective motion. An example in this case, is the Langmuir waves where plasma electrons oscillate against a st ...
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