Analysis of radio wave scattering from rough sea surfaces based on high frequency approximation algorithm

2014 ◽  
Author(s):  
Lanchao Zhang ◽  
Tao Jiang
Keyword(s):  
Approximation Algorithm ◽  
Radio Wave ◽  
High Frequency ◽  
Wave Scattering ◽  
Rough Sea ◽  
Frequency Approximation

scholarly journals A HAMILTONIAN-PRESERVING SCHEME FOR HIGH FREQUENCY ELASTIC WAVES IN HETEROGENEOUS MEDIA

2006 ◽  
Vol 03 (04) ◽  
pp. 741-777 ◽  
Author(s):  
SHI JIN ◽  
XIAOMEI LIAO
Keyword(s):  
Elastic Waves ◽  
High Frequency ◽  
Wave Scattering ◽  
Heterogeneous Media ◽  
Numerical Schemes ◽  
Material Interfaces ◽  
Numerical Convergence ◽  
Numerical Resolution ◽  
Singular Coefficients ◽  
Frequency Approximation

We develop a class of Hamiltonian-preserving numerical schemes for high frequency elastic waves in heterogeneous media. The approach is based on the high frequency approximation governed by the Liouville equations with singular coefficients due to material interfaces. As previously done by Jin and Wen [10, 12], we build into the numerical flux the wave scattering information at the interface, and use the Hamiltonian preserving principle to couple the wave numbers at both sides of the interface. This gives a class of numerical schemes that allows a hyperbolic CFL condition, is positive and l∞ stable, and captures correctly wave scattering at the interface with a sharp numerical resolution. We also extend the method to curved interfaces. Numerical experiments are carried out to study the numerical convergence and accuracy.

scholarly journals Radio wave scattering in the outer heliosphere

2000 ◽  
Vol 105 (A3) ◽  
pp. 5149-5156 ◽  
Author(s):  
J. W. Armstrong ◽  
W. A. Coles ◽  
B. J. Rickett
Keyword(s):  
Radio Wave ◽  
Wave Scattering ◽  
Outer Heliosphere

scholarly journals Non‐Gaussian Radio‐Wave Scattering in the Interstellar Medium

2006 ◽  
Vol 640 (1) ◽  
pp. 344-352 ◽  
Author(s):  
Stanislav Boldyrev ◽  
Arieh Konigl
Keyword(s):  
Interstellar Medium ◽  
Radio Wave ◽  
Wave Scattering ◽  
Non Gaussian

scholarly journals High-frequency radio wave electrocautery in modified Hotz operations for epiblepharon correction

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Hyunkyu Lee ◽  
Jimin Youn ◽  
Sehyun Baek
Keyword(s):  
Radio Wave ◽  
Recurrence Rate ◽  
High Frequency ◽  
Operation Time ◽  
Lower Eyelid ◽  
Dual Frequency ◽  
Ocular Symptoms ◽  
Minimal Scarring ◽  
Degree Of Satisfaction

AbstractTo report the experience and advantageous effects of high-frequency radio wave electrocautery in modified Hotz operations for epiblepharon, We reviewed the records of all pediatric patients who underwent a modified Hotz operation with the use of high-frequency radio wave electrocautery (Ellman Surgitron Dual Frequency RF S5; Ellman International, Inc, Hewlett, NY) for epiblepharon between March 2016 and September 2019 at Korea University Guro Hospital. We evaluated the success rate, complications, recurrence rate and degree of satisfaction of our technique. Information from the medical records was collected, including demographics, ocular symptoms, severity of keratopathy, operation time, success/recurrence rate, and complications. 133 patients (98.52%) showed good correction of epiblepharon without complications or unpleasant cosmetic problems during 3 months of median follow-up period. Two patients (1.48%) showed recurrent corneociliary touch, but the degree was very mild and re-operation was not performed. One patient showed mild ectropion on his left lower eyelid, but the patient recovered well without operation. For complications, suture abscess and granulation were the most common, 3 cases in each, but all of those were temporary and resolved with conservative management. The approach with electrocautery for epiblepharon allows precise and fast incision of the lower eyelid, little bleeding, and minimal scarring. Surgical outcomes associated with the modified Hotz operation with electrocautery were consistent with previous studies.

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