OALib Journal
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Sep 13, 2018Open    AccessArticle

The Phase-Space Noncommutativity Effect on the Large and Small Wave-Function Components Approach at Dirac Equation

Ilyas Haouam
By the large and small wave-function components approach we achieved the nonrelativistic limit of the Dirac equation in interaction with an electromagnetic potential in noncommutative phase-space, and we tested the effect of the phase-space noncommutativity on it, knowing that the nonrelativistic limit of the Dirac equation gives the Schrodinger-Pauli equation.

Jul 25, 2018Open    AccessArticle

Design of a High Frequency Driving Circuit of Surface Acoustic Wave Transducer

Guan Zhao
In this paper, a high frequency driving circuit of surface acoustic wave transducer has been designed to separate oil from oil/water mixed droplet. The transmission frequency of the surface acoustic wave transducer driving circuit can be up to 1 MHz. The transmit frequency of conventional ultrasonic driving circuit is mostly 40 kHz. However, the high transmit frequency driving circuit presents a good stability and accuracy. By est

Mar 27, 2018Open    AccessArticle

The Motional EMF in Conductors with Ferromagnetic Shield

Alexander I. Korolev
The motional EMF in segments of the copper wire with magnetic shielding is found according to the voltage lack in two coils with partial shielding moving relative to the magnetic field lines. The first coil moved across the Earth’s magnetic field lines. The second one was located near the end face of the rotating disk magnet with an axial magnetization. Permalloy foil wound around a part of turns containing w

Feb 09, 2018Open    AccessArticle

Propagation of Natural Waves on Plates of a Variable Cross Section

Ismail Ibrahimovich Safarov, Zafar Ihterovich Boltaev
In this paper, a conjugate spectral problem and biorthogonality conditions for the problem of extended plates of variable thickness are constructed. A technique for solving problems and numerical results on the propagation of waves in infinite extended viscoelastic plates of variable thickness is described. The viscous properties of the material are taken into account using the Voltaire integral operator. The investigation is carr

Jan 31, 2018Open    AccessArticle

A Corrected EMF Problem

Frederick Young
An error in The Lectures on Physics by Feyman, Leighton and Sands is dis-cussed and corrected. It is caused by the improper application of Faraday’s in-duced voltage law.

Dec 15, 2017Open    AccessArticle

Scattering of Stationary and Non-Stationary Sound by Ideal and Elastic Scatterers, Placed near Interface of Media, in Underwater Sound Channel and in Plane Waveguide

Alexander Kleshchev
In the review we obtained a strict solution of problem of the sound diffraction by an elastic spheroidal shell, located near the interface of a liquid medium with an elastic solid medium. Calculation of the scattered sound field for ideal bodies (a spheroid and an elliptical cylinder) is performed. These bodies are placed on the interface between the liquid and the ideal medium; it is shown, that the main role is played not

Nov 22, 2017Open    AccessArticle

Bi-Stable Spiral Waves: Stepped Spiral Waves

Jian Gao, Qun Wang, Huaping Lv
A new type of bi-stable spiral waves called “stepped spiral waves”, is investigated in this study in an oscillatory medium exhibiting period-doubling bifurcations. Prior to the period-doubling bifurcation of this system, the stepped spiral waves are produced by an unwanted phase trajectory event; the loss of symmetry takes the form of synchronization defect lines, where the trajectory in the l

Nov 15, 2017Open    AccessArticle

Version of Accelerating Expansion Is in Contradistinction to a Lot of Facts of Observations

Banggu Zhang, Bangning Zhang, Yinan Zhang
The term “accelerating expansion” is contradicted to follow observation facts: Accelerating expansion means repulsive force account for 70% and the universal space will be open. However, the observation facts indicate that the cosmetic space is flat and cosmos microwave background radiation is blackbody radiation. That is to say, it is equilibrium radiation. The cosmos is a gravitationally bound system.

Mar 30, 2017Open    AccessArticle

Electromagnetic Waves Propagation Modes of Hot Plasma Located in Rotating Electromagnetic Field

Richard Mwamba Mutombo, Abert Kazadi Mukenga Bantu, Edmond Phuku Phuati, Alain Lubo Musongela
In this work it was established different electromagnetic wave propagation modes of hot plasma located in rotating electromagnetic field when the temperature is finite and when the temperature is considered as infinite. It is noticed that the plasma is completely transparent and isotropic with refractive index equal to unity when the temperature is infinite.

Jul 20, 2016Open    AccessArticle

The Entrance Region of Circular Pipes Revisited

Frederick J. Young
The laminar flow in the entrance region of pipes having a circular cross section is investigated by the use of finite element solutions to the full Navier-Stokes equations in cylindrical coordinates. Because these solutions cover the complete three-dimensional geometry the usual development length is no longer a very interesting parameter as explained herein. The velocities and pressures are determined throughout the pipe and pres