Speaker system with reconfigurable high-frequency dispersion pattern

1999 ◽  
Vol 105 (1) ◽  
pp. 22
Author(s):  
David L. Smith
Keyword(s):  
High Frequency ◽  
Frequency Dispersion ◽  
Dispersion Pattern

Magnetic Permeability and Relaxation Frequency in High Frequency Magnetic Materials.

2001 ◽  
Vol 674 ◽  
Author(s):  
M.I. Rosales ◽  
H. Montiel ◽  
R. Valenzuela
Keyword(s):  
High Frequency ◽  
Domain Walls ◽  
Magnetocrystalline Anisotropy ◽  
Low Frequency ◽  
Frequency Dispersion ◽  
Anisotropy Constant ◽  
Relaxation Frequency ◽  
Resonance Relaxation ◽  
Frequency Behavior

ABSTRACTAn investigation of the frequency behavior of polycrystalline ferrites is presented. It is shown that the low frequency dispersion (f < 10 MHz) of permeability is associated with the bulging of pinned domain walls, and has a mixed resonance-relaxation character, closer to the latter. It is also shown that there is a linear relationship between the magnetocrystalline anisotropy constant, K1, and the relaxation frequency. The slope of this correlation depends on the grain size. Such a relationship could allow the determination of this basic parameter from polycrystalline samples.

scholarly journals Hawking spectrum and high frequency dispersion

1996 ◽  
Vol 54 (2) ◽  
pp. 1568-1586 ◽  
Author(s):  
Steven Corley ◽  
Ted Jacobson
Keyword(s):  
High Frequency ◽  
Frequency Dispersion

scholarly journals From frequency dispersion to ohmic impedance: A new insight on the high-frequency impedance analysis of electrochemical systems

2019 ◽  
Vol 320 ◽  
pp. 134609 ◽  
Author(s):  
Oumaïma Gharbi ◽  
Arthur Dizon ◽  
Mark E. Orazem ◽  
Mai T.T. Tran ◽  
Bernard Tribollet ◽  
...  
Keyword(s):  
High Frequency ◽  
Frequency Dispersion ◽  
Impedance Analysis ◽  
Electrochemical Systems

The ponderomotive force of a high-frequency electromagnetic field in a cold magnetized plasma

1982 ◽  
Vol 27 (2) ◽  
pp. 215-224 ◽  
Author(s):  
V. I. Karpman ◽  
A. G. Shagalov
Keyword(s):  
Electromagnetic Field ◽  
Liquid Medium ◽  
Magnetic Moment ◽  
High Frequency ◽  
Ponderomotive Force ◽  
Frequency Dispersion ◽  
Magnetized Plasma ◽  
Complete Agreement ◽  
Microscopic Approach ◽  
High Frequency Electromagnetic Field

An expression is derived for the ponderomotive force acting in a cold collisionless magnetized plasma in a high-frequency electromagnetic field. Some related topics, such as the magnetic moment and solenoidal currents induced by the HF field are considered. A microscopic approach is used. The results are in complete agreement with the general expression for the ponderomotive force in a liquid medium with frequency dispersion obtained earlier by Washimi & Karpman by means of phenomenological considerations.

scholarly journals Debye’s temperature and heat capacity for Sr0.15Ba0.85Bi2Nb2O9 relaxor ferroelectric ceramic

2016 ◽  
Vol 06 (01) ◽  
pp. 1620001
Author(s):  
A. Peláiz-Barranco ◽  
Y. González-Abreu ◽  
P. Saint-Grégoire ◽  
J. D. S. Guerra ◽  
F. Calderón-Piñar
Keyword(s):  
Heat Capacity ◽  
Dielectric Permittivity ◽  
High Frequency ◽  
Frequency Dispersion ◽  
Freezing Temperature ◽  
Ferroelectric Ceramic ◽  
Relaxor Ferroelectric ◽  
Relaxor Behavior ◽  
Temperature Range ◽  
Glass Model

A lead-free relaxor ferroelectric, Sr[Formula: see text]Ba[Formula: see text]Bi2Nb2O9, was synthesized via solid-state reaction and the temperature-dependence of the heat capacity was measured in a wide temperature range. The dielectric permittivity was also measured between 500[Formula: see text]Hz and 5[Formula: see text]MHz in the same temperature range. No anomaly has been detected in the heat capacity curve for the whole temperature range covered in the present experiments, while broad peaks have been observed in the dielectric permittivity with high frequency dispersion. A typical relaxor behavior has been observed from the dielectric analysis. The Debye’s temperature has showed a minimum value near the freezing temperature. The results are discussed considering the spin-glass model and the high frequency dispersion, which has been observed for the studied relaxor system.

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