Closure to “Discussions of ‘An Analysis of the Flow of a Viscoelastic Fluid Between Arbitrary Two-Dimensional Surfaces Subject to Normal High Frequency Oscillations’” (1978, ASME J. Lubr. Technol., 101, pp. 152–153)

1979 ◽  
Vol 101 (2) ◽  
pp. 153-153
Author(s):  
J. A. Tichy ◽  
Mary Ellen Skinkle
Keyword(s):  
Viscoelastic Fluid ◽  
High Frequency ◽  
Two Dimensional ◽  
High Frequency Oscillations

An Analysis of the Flow of a Viscoelastic Fluid Between Arbitrary Two-Dimensional Surfaces Subject to Normal High Frequency Oscillations

1979 ◽  
Vol 101 (2) ◽  
pp. 145-152 ◽  
Author(s):  
J. A. Tichy ◽  
Mary Ellen Skinkle
Keyword(s):  
Viscoelastic Fluid ◽  
High Frequency ◽  
Equations Of Motion ◽  
Oscillation Amplitude ◽  
Complex Viscosity ◽  
Two Dimensional ◽  
Fluid Inertia ◽  
Inertia Effects ◽  
Resonance Effects ◽  
High Frequency Oscillations

An analytic solution is presented for the flow of a viscoelastic fluid between arbitrary but sufficiently smooth two-dimensional surfaces, one of which is subjected to small high frequency oscillations normal to the other. The results are presented in terms of the complex viscosity parameters of linear viscoelasticity, and are valid for any simple viscoelastic fluid, provided the oscillation amplitude is sufficiently small. Fluid inertia effects are included although convective inertia terms are shown to be negligible through order-of-magnitude considerations. The resulting linearized equations of motion can be solved through conventional means by techniques established in earlier works. Solutions for the velocity field, pressure distribution, and load are presented in terms of the Reynolds and Deborah numbers. Two illustrative cases are demonstrated—the tapered thrust bearing and the partial journal bearing. Unusual resonance effects in pressure and load are exhibited as the oscillation frequency (or Reynolds number) is increased for a particular fluid.

Despeckling of Sar Images Using Shrinkage of Two-Dimensional Discrete Orthonormal S-Transform

2020 ◽  
pp. 2150023
Author(s):  
Priya R. Kamath ◽  
Kedarnath Senapati ◽  
P. Jidesh
Keyword(s):  
High Frequency ◽  
Low Frequency ◽  
Relevant Information ◽  
Detection Algorithm ◽  
Two Dimensional ◽  
Sar Images ◽  
S Transform ◽  
Processing Step ◽  
Frequency Components ◽  
Shock Filter

Speckles are inherent to SAR. They hide and undermine several relevant information contained in the SAR images. In this paper, a despeckling algorithm using the shrinkage of two-dimensional discrete orthonormal S-transform (2D-DOST) coefficients in the transform domain along with shock filter is proposed. Also, an attempt has been made as a post-processing step to preserve the edges and other details while removing the speckle. The proposed strategy involves decomposing the SAR image into low and high-frequency components and processing them separately. A shock filter is used to smooth out the small variations in low-frequency components, and the high-frequency components are treated with a shrinkage of 2D-DOST coefficients. The edges, for enhancement, are detected using a ratio-based edge detection algorithm. The proposed method is tested, verified, and compared with some well-known models on C-band and X-band SAR images. A detailed experimental analysis is illustrated.

scholarly journals Can we use intraoperative high‐frequency oscillations to guide tumor‐related epilepsy surgery?

Epilepsia ◽  
2021 ◽  
Author(s):  
Nicole E. C. Klink ◽  
Willemiek J. E. M. Zweiphenning ◽  
Cyrille H. Ferrier ◽  
Peter H. Gosselaar ◽  
Kai J. Miller ◽  
...  
Keyword(s):  
Epilepsy Surgery ◽  
High Frequency ◽  
High Frequency Oscillations

scholarly journals High-frequency oscillations recorded with surface EEG in neonates with seizures

2021 ◽  
Author(s):  
Lotte Noorlag ◽  
Maryse A. van 't Klooster ◽  
Alexander C. van Huffelen ◽  
Nicole E.C. van Klink ◽  
Manon J.N.L. Benders ◽  
...  
Keyword(s):  
High Frequency ◽  
High Frequency Oscillations ◽  
Surface Eeg
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