Výsledky vyhledávání - "E. J. Powers"

Implementation of the continuous wavelet transform for digital time series analysis

Autor: R. W. Miksad, D. Jordan, E. J. Powers

Publikováno v: Review of Scientific Instruments. 68:1484-1494

The wavelet transform has emerged as an important tool for the analysis of intermittent and nonstationary signals. This article addresses implementation issues of a digital continuous wavelet transform that is sufficiently general that any continuous

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8e43ac5dff1a52fbd66dc777c038ea33
https://doi.org/10.1063/1.1147636

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Nonlinear coupling of low n modes in PBX-M

Autor: B.P. LeBlanc, R. Kaita, G. Gammel, E. J. Powers, S. Sesnic, Fred Levinton, A. Holland, S. Im, R.E. Bell, H. Takahashi, S.M. Kaye, M. Okabayashi, H.W. Kugel

Publikováno v: Nuclear Fusion. 34:1365-1383

In many of the medium and high beta discharges in PBX-M, low n modes (n=1-4) with different n numbers are observed. The prevalence of low n modes decreases with increasing n number. Furthermore, if two modes of different frequency and n number (?1, a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a8abb9b8fdfd177274868973ad80ce50
https://doi.org/10.1088/0029-5515/34/10/i06

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Adaptive second-order Volterra filtering and its application to second-order drift phenomena

Autor: E. J. Powers, Kiho Kim, Sung Bae Kim, F.J. Fischer, R.W. Miksad

Publikováno v: IEEE Journal of Oceanic Engineering. 19:183-192

This paper presents an adaptive second-order Volterra filter and its application to model-test data of a prototype tension leg platform (TLP). The least-squares approach of a second-order Volterra model and its adaptive filtering algorithm based on r

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2787bb957eb34aad6d1566161e91240a
https://doi.org/10.1109/48.286640

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Wavenumber mismatch of interacting modes in a plane wake

Autor: J. B. Davila, M. R. Hajj, R. W. Miksad, E. J. Powers

Publikováno v: Applied Scientific Research. 51:385-389

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cf4f2a5fdf07ca023c1831405382104e
https://doi.org/10.1007/bf01082565

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Digital estimation of linear/Quadratic transfer functions with a general random input

Autor: E. J. Powers, Kyoung Yoon Kim

Publikováno v: ICASSP

A new digital method of estimating linear and quadratic transfer functions of a quadratic system with a general random input is presented. The feasibility of the technique is demonstrated by analyzing simulated data. It is also shown that considerabl

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::957f056a1858d1d58ac9dea4280b9d49
https://doi.org/10.1109/icassp.1986.1168758

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Experimental investigation of the fundamental-subharmonic coupling -Effect of the initial phase difference

Autor: R. W. Miksad, E. J. Powers, M. R. Hajj

Publikováno v: 29th Aerospace Sciences Meeting.

The effect of forcing the fundamental and subharmonic modes at different initial phases on the subharmonic growth in a transitioning free shear layer is investigated. The variations in the development of the subharmonic and fundamental modes under na

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ae5df3c13cd8c593ec460bab2ec4a0b0
https://doi.org/10.2514/6.1991-624

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Non-linear coupling of low n modes in PBX-M

Autor: E. J. Powers, S. Sesnic, H.W. Kugel, M. Okabayashi, S.M. Kaye, G. Gammel, B.P. LeBlanc, H. Takahashi, S. Im, R. Kaita, Fred Levinton, A. Holland, R.E. Bell

Publikováno v: Nuclear Fusion. 35:244-245

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f3b30d4f402eb8dfbabcde33c5dcbc90
https://doi.org/10.1088/0029-5515/35/2/515

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Estimation of wavenumber and frequency spectra using fixed probe pairs

Autor: Y. C. Kim, E. J. Powers, J. M. Beall

Publikováno v: Journal of Applied Physics. 53:3933-3940

We introduce the concept of the local wavenumber and frequency spectral density, which can be estimated using spatially fixed, point data sources (’’fixed probe pairs’’), and discuss the relationship of this spectral density to the convention

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b88275c7df7eb844a23536910286ad11
https://doi.org/10.1063/1.331279

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Transport studies in the TEXT Tokamak

Autor: D. L. Brower, P. E. Phillips, David W. Ross, D. Paterson, R. Savage, T. P. Price, B. Richards, William L. Rowan, Kenneth W Gentle, W. L. Hodge, Ch. P. Ritz, W. A. Peebles, Roger D. Bengtson, T. P. Kochanski, E. J. Powers, N. C. Luhmann, Y. S. Wan, R. V. Bravenec, J. C. Wiley

Publikováno v: Plasma Physics and Controlled Fusion. 26:1407-1418

The TEXT tokamak (BT=3 T; R=1 m; a=.27 m) has been used for extensive studies of particle and electron thermal transport and of the microturbulence which may be causing the transport, which is observed to be far greater than neoclassical predictions.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7586ee934c86779ebdf9e66fa0356a51
https://doi.org/10.1088/0741-3335/26/12a/006

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Microwave measurement of plasma density fluctuation amplitudes

Autor: T. C. Simonen, E. J. Powers

Publikováno v: Journal of Applied Physics. 47:3911-3917

A microwave beam is used to detect ion‐cyclotron oscillations in the 2XIIB mirror device. A model is used to estimate electron density and electric field oscillation amplitudes from measured modulation sideband intensities. Semiquantitative agreeme

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9e7a27b54b13fb29720fcd573e5eb733
https://doi.org/10.1063/1.323256

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