scholarly journals Density perturbation mode structure of high frequency compressional and global Alfvén eigenmodes in the National Spherical Torus Experiment using a novel reflectometer analysis technique

2017 ◽  
Vol 58 (1) ◽  
pp. 016051 ◽  
Author(s):  
N.A. Crocker ◽  
S. Kubota ◽  
W.A. Peebles ◽  
T.L. Rhodes ◽  
E.D. Fredrickson ◽  
...  
Keyword(s):  
High Frequency ◽  
Density Perturbation ◽  
Spherical Torus ◽  
Mode Structure ◽  
Analysis Technique ◽  
Perturbation Mode ◽  
Alfven Eigenmodes

scholarly journals Study of chirping toroidicity-induced Alfvén eigenmodes in the National Spherical Torus Experiment

2012 ◽  
Vol 52 (9) ◽  
pp. 094001 ◽  
Author(s):  
M. Podestà ◽  
R.E. Bell ◽  
A. Bortolon ◽  
N.A. Crocker ◽  
D.S. Darrow ◽  
...  
Keyword(s):  
Spherical Torus ◽  
Alfven Eigenmodes

Acoustic Signals Analysis Based on Empirical Mode Decomposition and Spectrum Analysis Technique

2010 ◽  
Vol 40-41 ◽  
pp. 91-95 ◽  
Author(s):  
Yan Li Zhang
Keyword(s):  
Empirical Mode Decomposition ◽  
High Frequency ◽  
Acoustic Signals ◽  
Intrinsic Mode Functions ◽  
Mode Decomposition ◽  
Analysis Technique ◽  
Marginal Spectrum ◽  
Rock Interface ◽  
Coal Rock ◽  
Instantaneous Energy

A method to analyze the acoustic signals collected in fully-mechanized caving face is presented in this paper. Through analyzing the marginal spectrum and frequency spectrum of intrinsic mode functions obtained by empirical mode decomposition, acoustic signals’ frequency and amplitude characteristics are gotten, that is, high frequency signals about 1000Hz ~2800Hz are produced when the top coal is combined with gangue. Furthermore, the acoustic signals’ instantaneous energy spectrums in the frequency range of 1000Hz ~2800Hz can be used to identify the coal-rock interface.

scholarly journals High frequency mode generation by toroidal Alfvén eigenmodes

2019 ◽  
Vol 26 (7) ◽  
pp. 074501
Author(s):  
Shizhao Wei ◽  
Peiwan Shi ◽  
Liming Yu ◽  
Wei Chen ◽  
Ningfei Chen ◽  
...  
Keyword(s):  
High Frequency ◽  
Frequency Mode ◽  
High Frequency Mode ◽  
Alfven Eigenmodes ◽  
Mode Generation

Properties of Alfvén eigenmodes in the Toroidal Alfvén Eigenmode range on the National Spherical Torus Experiment-Upgrade

2013 ◽  
Vol 20 (8) ◽  
pp. 082502 ◽  
Author(s):  
M. Podestà ◽  
N. N. Gorelenkov ◽  
R. B. White ◽  
E. D. Fredrickson ◽  
S. P. Gerhardt ◽  
...  
Keyword(s):  
Spherical Torus ◽  
Alfven Eigenmodes

scholarly journals Effects of Toroidal Rotation Sshear on Toroidicity-induced Alfven Eigenmodes in the National Spherical Torus Experiment

2010 ◽  
Author(s):  
M Podesta ◽  
E Fredrickson ◽  
N Gorelenkov ◽  
B LeBlanc ◽  
W Heidbrink ◽  
...  
Keyword(s):  
Spherical Torus ◽  
Toroidal Rotation ◽  
Alfven Eigenmodes

A mel-cepstral analysis technique restoring high frequency components from low-sampling-rate speech

2014 ◽  
Author(s):  
Kazuhiro Nakamura ◽  
Kei Hashimoto ◽  
Keiichiro Oura ◽  
Yoshihiko Nankaku ◽  
Keiichi Tokuda
Keyword(s):  
High Frequency ◽  
Sampling Rate ◽  
Cepstral Analysis ◽  
Analysis Technique ◽  
Frequency Components
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