scholarly journals The diagnostic value of power spectra analysis of the sleep electroencephalography in narcoleptic patients

2015 ◽  
Vol 16 (12) ◽  
pp. 1516-1527 ◽  
Author(s):  
Julie Anja Engelhard Christensen ◽  
Emil Gammelmark Schreiner Munk ◽  
Paul E. Peppard ◽  
Terry Young ◽  
Emmanuel Mignot ◽  
...  
Keyword(s):  
Power Spectra ◽  
Diagnostic Value ◽  
Spectra Analysis

Chaotic vibrations of carbon nanotubes subjected to a traversing force considering nonlocal elasticity theory

2021 ◽  
pp. 239779142110633
Author(s):  
Reza Ebrahimi
Keyword(s):  
Nonlocal Parameter ◽  
Power Spectra ◽  
Beam Theory ◽  
Nonlocal Elasticity Theory ◽  
Effective Control ◽  
Maximum Lyapunov Exponent ◽  
Harmonic Force ◽  
Spectra Analysis ◽  
Chaotic Vibrations ◽  
Euler Bernoulli Beam

The existence of chaos in the lateral vibration of the carbon nanotube (CNT) can contribute to source of instability and inaccuracy within the nano mechanical systems. So, chaotic vibrations of a simply supported CNT which is subjected to a traversing harmonic force are studied in this paper. The model of the system is formulated by using nonlocal Euler–Bernoulli beam theory. The equation of motion is solved using the Rung–Kutta method. The effects of the nonlocal parameter, velocity and amplitude of the traversing harmonic force on the nonlinear dynamic response of the system are analyzed by the bifurcation diagrams, phase plane portrait, power spectra analysis, Poincaré map and the maximum Lyapunov exponent. The results indicate that the nonlocal parameter, velocity and amplitude of the traversing harmonic force have considerable effects on the bifurcation behavior and can be used as effective control parameters for avoiding chaos.

Autofocusing based on power-spectra analysis

1994 ◽  
Vol 33 (26) ◽  
pp. 6210 ◽  
Author(s):  
Suganda Jutamulia ◽  
Toshimitsu Asakura ◽  
R. D. Bahuguna ◽  
Panfilo C. De Guzman
Keyword(s):  
Power Spectra ◽  
Spectra Analysis

Power Spectra Analysis of Levator Veli Palatini Muscle Electromyogram During Velopharyngeal Closure for Swallowing, Speech, and Blowing

Dysphagia ◽  
2007 ◽  
Vol 22 (2) ◽  
pp. 135-139 ◽  
Author(s):  
Kanji Nohara ◽  
Yasuko Kotani ◽  
Maki Ojima ◽  
Yasuhiro Sasao ◽  
Takashi Tachimura ◽  
...  
Keyword(s):  
Power Spectra ◽  
Spectra Analysis ◽  
Levator Veli Palatini ◽  
Velopharyngeal Closure

scholarly journals Identification of Physical Components in Pulsar Emission

2000 ◽  
Vol 177 ◽  
pp. 177-178 ◽  
Author(s):  
J.H. Seiradakis ◽  
A. Karastergiou ◽  
M. Kramer ◽  
D. Psaltis
Keyword(s):  
Radio Telescope ◽  
High Frequency ◽  
Power Spectra ◽  
Emission Characteristics ◽  
Pulsar Emission ◽  
Spectra Analysis ◽  
Physical Components

AbstractWe have used power spectra analysis on high frequency (1.4 GHz) data, obtained with the Effelsberg 100m radio-telescope in order to investigate the emission characteristics of pulsars. This analysis has not only revealed the prominent periodicities of the fluctuating components, but has also proven a powerful tool for identifying weak and often unresolved components and their longitudinal location within the integrated pulsar profile. Furthermore, close examination of the properties of the fluctuating components indicates physical connections between them, giving new insight to the structure of the emitting region.

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