Intraband Faraday and Voigt effects in lead telluride

1969 ◽  
Vol 47 (1) ◽  
pp. 31-37 ◽  
Author(s):  
K. K. Chandler ◽  
P. R. Wallace
Keyword(s):  
Magnetic Fields ◽  
Electromagnetic Fields ◽  
Plasma Frequency ◽  
Normal Modes ◽  
Lead Telluride ◽  
Coupled System ◽  
Major Axis ◽  
Transmitted Wave ◽  
Elliptically Polarized

The Faraday and Voigt coefficients—rotation of the axis of polarization, and the ratio of minor to major axis of the elliptically polarized transmitted wave—have been calculated at frequencies up to and beyond the intraband plasma frequency, and for magnetic fields up to 120 kG. The behavior of these coefficients is simply related to the spectrum of normal modes of the coupled system of electrons, ions, and electromagnetic fields.

scholarly journals The perturbation of electromagnetic fields at distances that are large compared with the object's size

2014 ◽  
Vol 80 (3) ◽  
pp. 865-892 ◽  
Author(s):  
Paul D Ledger ◽  
William R B Lionheart
Keyword(s):  
Magnetic Fields ◽  
Electromagnetic Fields ◽  
Asymptotic Expansions ◽  
Low Frequency ◽  
Perfect Conductor ◽  
Small Object ◽  
Leading Order ◽  
Material Parameters ◽  
Electric And Magnetic Fields

Abstract We rigorously derive the leading-order terms in asymptotic expansions for the scattered electric and magnetic fields in the presence of a small object at distances that are large compared with its size. Our expansions hold for fixed wavenumber when the scatterer is a (lossy) homogeneous dielectric object with constant material parameters or a perfect conductor. We also derive the corresponding leading-order terms in expansions for the fields for a low-frequency problem when the scatterer is a non-lossy homogeneous dielectric object with constant material parameters or a perfect conductor. In each case, we express our results in terms of polarization tensors.

Experimental Periodic Localized Motions in Coupled Beams With Active Nonlinearities

1995 ◽  
Author(s):  
Melvin E. King ◽  
Johannes Aubrecht ◽  
Alexander F. Vakakis
Keyword(s):  
Steady State ◽  
Vibrational Energy ◽  
Normal Modes ◽  
Coupled System ◽  
Nonlinear Normal Modes ◽  
Nonlinear Frequency ◽  
Nonlinear Phenomenon ◽  
Response Curves ◽  
Nonlinear Motion ◽  
Spatially Extended

Abstract Steady-state nonlinear motion confinement is experimentally studied in a system of weakly coupled cantilever beams with active stiffness nonlinearities. Quasi-static swept-sine tests are performed by periodically forcing one of the beams at frequencies close to the first two closely-spaced modes of the coupled system, and experimental nonlinear frequency response curves for certain nonlinearity levels are generated. Of particular interest is the detection of strongly localized steady-state motions, wherein vibrational energy becomes spatially confined mainly to the directly excited beam. Such motions exist in neighborhoods of strongly localized anti-phase nonlinear normal modes (NNMs) which bifurcate from a spatially extended NNMs of the system. Steady-state nonlinear motion confinement is an essentially nonlinear phenomenon with no counterpart in linear theory, and can be implemented in vibration and shock isolation designs of mechanical systems.

scholarly journals Cytological effects of pulsed electromagnetic fields and static magnetic fields induced by a therapeutic device on in vivo exposed rats

2015 ◽  
Vol 12 (6) ◽  
pp. 162
Author(s):  
Abraham O. Rodríguez-De la Fuente ◽  
J. Antonio Heredia-Rojas ◽  
Pilar Carranza-Rosales ◽  
Omar Heredia-Rodríguez ◽  
Gerardo Lozano-Garza ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Electromagnetic Fields ◽  
Pulsed Electromagnetic Fields ◽  
Static Magnetic Fields ◽  
Therapeutic Device ◽  
Pulsed Electromagnetic

scholarly journals ANALISIS HUBUNGAN SALURAN TEGANGAN TINGGI LISTRIK TERHADAP JARINGAN SELULAR DI DAERAH GRAHA INDAH TAMBAKBOYO LAMONGAN

JOUTICA ◽  
2019 ◽  
Vol 4 (2) ◽  
pp. 255
Author(s):  
Kemal Farouq Mauladi ◽  
Nurul Fuad
Keyword(s):  
Public Health ◽  
Magnetic Fields ◽  
Electric Field ◽  
Cellular Networks ◽  
Electromagnetic Fields ◽  
Electricity Generation ◽  
Negative Impact ◽  
Electrical Energy ◽  
Electric And Magnetic Fields ◽  
The Impact

Telecommunications technology is developing very rapidly, ranging from users or engineers. The development of smartphone smartphones is also increasingly in demand, so that the use of electricity needs is also increasing. The need for electricity usage has resulted in more standing voltage in some settlements. The establishment of sutet will have a negative impact on public health. In addition, the influence of electrical energy on humans occurs because the electrical energy generated by electricity generation or electricity that is channeled gives rise to electromagnetic fields. The higher the voltage required by an equipment, the greater the electric field that is distributed. Besides that, it can also find ways to reduce the negative impact of the electric and magnetic fields produced by SUTET which impacts the process of the occurrence of electric and magnetic fields on SUTET. From the problems above, the author intends to determine the effect or correlation between the impact of SUTET on cellphone network transmissions or channels. This research can later determine the negative impact caused by SUTET for the surrounding community, and the impact of SUTET radiation on cellular networks.

Ion acceleration by multiple laser pulses and their spontaneous electromagnetic fields in plasma

2008 ◽  
Vol 74 (1) ◽  
pp. 111-118
Author(s):  
FEN-CE CHEN
Keyword(s):  
Magnetic Fields ◽  
Electric Field ◽  
Analytical Model ◽  
Electromagnetic Fields ◽  
Equations Of Motion ◽  
Charged Particles ◽  
Laser Pulses ◽  
The Self ◽  
Electric And Magnetic Fields ◽  
Relativistic Equations

AbstractThe acceleration of ions by multiple laser pulses and their spontaneously generated electric and magnetic fields is investigated by using an analytical model for the latter. The relativistic equations of motion of test charged particles are solved numerically. It is found that the self-generated axial electric field plays an important role in the acceleration, and the energy of heavy test ions can reach several gigaelectronvolts.

scholarly journals Plasma Damping of Gravitational Waves

1990 ◽  
Vol 142 ◽  
pp. 62-62
Author(s):  
C. Sivaram
Keyword(s):  
Neutron Star ◽  
Magnetic Fields ◽  
Gravitational Waves ◽  
Plasma Frequency ◽  
Landau Damping ◽  
Plasma Medium ◽  
Plane Gravitational Waves

The possibility of the damping of plane gravitational waves while propagating in a plasma medium is considered. The gravitational plasma frequency, is for a neutron star medium ~ 103Hz, which is the same as the frequency of the gravitational waves emitted by a collapsing star. So resonant damping of such waves within a collapsing star is probable. Estimates are made for the damping length for dense and dilute plasmas (also in the presence of magnetic fields). Analogies with Landau damping are made. Applications to other astrophysical situations are outlined.

The crystal dynamics of lead sulphide

1967 ◽  
Vol 300 (1461) ◽  
pp. 210-217 ◽  
Keyword(s):  
Inelastic Neutron Scattering ◽  
Normal Modes ◽  
Lead Telluride ◽  
Alkali Halides ◽  
Inelastic Neutron ◽  
High Symmetry ◽  
Lead Sulphide ◽  
Shell Models ◽  
Longitudinal Optic

The frequencies of normal modes propagating in the high symmetry directions, [001], [110] and [111], of lead sulphide have been measured by inelastic neutron scattering techniques. A marked decrease in the value of the longitudinal optic mode frequency has been observed at small wavevectors. A similar effect has been reported in lead telluride, and is attributable to the screening of the macroscopic electric field by the free carriers in the crystal. The longitudinal optic mode frequencies have been estimated for the particular case of zero carrier concentration. The corrected frequencies have been used to deduce the parameters of rigid ion models and shell models for the interatomic forces of lead sulphide. The quality of the fit for both types of models is less satisfactory than for the equivalent models used for the alkali halides, but is comparable with those obtained for lead telluride. The best model gives a good fit to the frequencies, and has been used to calculate the frequency distribution and specific heat of lead sulphide. There is a marked similarity between some of the models of lead sulphide and lead telluride. One of these models has been used to calculate dispersion curves for lead selenide, and fair agreement has been obtained with the available experimental data.

scholarly journals Large-scale magnetic fields, non-Gaussianity, and gravitational waves from inflation

2017 ◽  
Vol 32 (36) ◽  
pp. 1747021
Author(s):  
Kazuharu Bamba
Keyword(s):  
Scalar Field ◽  
Magnetic Fields ◽  
Gravitational Waves ◽  
Electromagnetic Fields ◽  
Conformal Invariance ◽  
Large Scale ◽  
Gauge Fields ◽  
Density Perturbations ◽  
Hubble Horizon

We explore the generation of large-scale magnetic fields in the so-called moduli inflation. The hypercharge electromagnetic fields couple to not only a scalar field but also a pseudoscalar one, so that the conformal invariance of the hypercharge electromagnetic fields can be broken. We explicitly analyze the strength of the magnetic fields on the Hubble horizon scale at the present time, the local non-Gaussianity of the curvature perturbations originating from the massive gauge fields, and the tensor-to-scalar ratio of the density perturbations. As a consequence, we find that the local non-Gaussianity and the tensor-to-scalar ratio are compatible with the recent Planck results.

Electromagnetic fields at work places experts of the cellular companies

10.12737/5019 ◽  
2014 ◽  
Vol 8 (1) ◽  
pp. 1-4
Author(s):  
Горохов ◽  
E. Gorokhov ◽  
Ляпкало ◽  
A. Lyapkalo
Keyword(s):  
Magnetic Fields ◽  
Electromagnetic Radiation ◽  
Electromagnetic Fields ◽  
Electric Fields ◽  
Working Conditions ◽  
Base Stations ◽  
Frequency Range ◽  
Magnetic Components ◽  
Electronic Computers ◽  
The Impact

The paper presents the results of instrumental studies by means of hygienic assessment of levels of electromagnetic fields (EMF) on the workplaces in cellular companies. Measurements of EFM were made on workplaces of 2 groups of employees during the studies: office administrative specialists and technical employees. Instrumental measurements of EMF levels were made by Personal Electronic Computers (PCs) and receivingtransmitting equipment of base cellular stations (BCS). Measurements of EMF from the PC´s screens based on electric and magnetic components were performed: a tension of electric fields with a frequency range of 5Hz-2 kHz and 2 kHz-4 kHz; a tension of magnetic fields in the frequency range of 5Hz-2 kHz and 2 kHz-4 kHz. Measurements of flux density of electromagnetic energy were performed at operating platforms of base stations and at control operating equipment rooms of cellular stations. There were about 150 workplaces of office administrative specialists with PCs surveyed and more 500 workplaces of technical specialists. The activities of administrations of cellular companies were estimated to ensure the safety of working conditions of employees under the influence of electromagnetic radiation (EMR). Literature data on the impact of EMR on human health and health of employees were presented.

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