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Sep 13, 2018Open AccessArticle
By the
large and small wavefunction components approach we achieved the nonrelativistic limit
of the Dirac equation in interaction with an electromagnetic potential in
noncommutative phasespace, and we tested the effect of the phasespace
noncommutativity on it, knowing that the nonrelativistic limit of the Dirac
equation gives the SchrodingerPauli equation.
Jul 25, 2018Open AccessArticle
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 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
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
An error in The Lectures on Physics by Feyman, Leighton and Sands is discussed and corrected. It is caused by the improper application of Faraday’s induced voltage law.
Dec 15, 2017Open AccessArticle
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
A new type
of bistable spiral waves called “stepped spiral waves”, is investigated in
this study in an oscillatory medium exhibiting perioddoubling bifurcations.
Prior to the perioddoubling 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
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
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 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
NavierStokes equations in cylindrical coordinates. Because these solutions
cover the complete threedimensional 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 ...
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