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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 ...
Jun 13, 2016Open AccessArticle
A physical fundament was derived to support the empirical correction to
the balance between the force given by Newton 2^{nd} law and Newton
gravitation introduced previously by the author to account for the perihelion precession
of Mercury. An equation was obtained that coincided in sign and magnitude with
the Einstein perihelion shift when the 3^{rd} law of Kepler was used to
express the orbital period in term of the semimajor axis and the same level of
accuracy was demanded. O...
Nov 11, 2015Open AccessArticle
A theory of relativistic traveling wave tube (RTWT) with magnetized cold plasmafilled
corrugated waveguide with solid electron beam is given. The entire system
influenced a strong longitudinal magnetic field that magnetized plasma and
electron beam. The characteristic of the dispersion relation is obtained by
numerical solutions. The effect of electron beam density, corrugated period,
waveguide radius on the dispersion relation and growth rate is analyzed. Some
useful results are given.
Oct 14, 2015Open AccessArticle
For many years the attempts to create a super long conductive channel
were taken in order to study the upper atmosphere and to settle special tasks,
related to the energy transmission. There upon the program of “Impulsar”
creation represents a great interest, as this program in a combination with highvoltage high repetition rate
electrical source can be useful to solve the above mentioned problems.
It looks like as some kind of “renaissance of N. Tesla ideas” for the days of
high power lasers. ...
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