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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
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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
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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
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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.
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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
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Jun 13, 2016Open    AccessArticle

An Extended Newtonian Theory for Gravitational Bound Systems

Barbaro Quintero-Leyva
A physical fundament was derived to support the empirical correction to the balance between the force given by Newton 2nd 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 3rd law of Kepler was used to express the orbital period in term of the semi-major axis and the same level of accuracy was demanded. O...


Nov 11, 2015Open    AccessArticle

Dispersion and Growth-Rate Characteristics of a Sinusoidally Corrugated Slow-Wave Structure in Presence of Cylindrical Electron Beam

Maryam Garjasi, Shahrooz Saviz
A theory of relativistic traveling wave tube (RTWT) with magnetized cold plasma-filled 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

Laser Source for Wireless Power Transmission in Space

Victor V. Apollonov
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 high-voltage 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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