scholarly journals Interference in edge-scattering from monocrystalline gold flakes [Invited]

2018 ◽  
Vol 8 (12) ◽  
pp. 3688 ◽  
Author(s):  
Sergejs Boroviks ◽  
Christian Wolff ◽  
Jes Linnet ◽  
Yuanqing Yang ◽  
Francesco Todisco ◽  
...  
Keyword(s):  
Edge Scattering

The theory of edge scattering

2017 ◽  
pp. 327-343
Author(s):  
Stewart Glegg ◽  
William Devenport
Keyword(s):  
Edge Scattering

scholarly journals On the noise prediction for serrated leading edges

2017 ◽  
Vol 826 ◽  
pp. 205-234 ◽  
Author(s):  
B. Lyu ◽  
M. Azarpeyvand
Keyword(s):  
Leading Edge ◽  
Directivity Pattern ◽  
Destructive Interference ◽  
Far Field ◽  
Low Frequencies ◽  
Power Spectral ◽  
Edge Scattering ◽  
Field Noise ◽  
Sound Reduction ◽  
Dipolar Pattern

An analytical model is developed for the prediction of noise radiated by an aerofoil with leading-edge serration in a subsonic turbulent stream. The model makes use of Fourier expansion and Schwarzschild techniques in order to solve a set of coupled differential equations iteratively and express the far-field sound power spectral density in terms of the statistics of incoming turbulent upwash velocity. The model has shown that the primary noise-reduction mechanism is due to the destructive interference of the scattered pressure induced by the leading-edge serrations. It has also shown that in order to achieve significant sound reduction, the serration must satisfy two geometrical criteria related to the serration sharpness and hydrodynamic properties of the turbulence. A parametric study has been carried out and it is shown that serrations can reduce the overall sound pressure level at most radiation angles, particularly at small aft angles. The sound directivity results have also shown that the use of leading-edge serration does not significantly change the dipolar pattern of the far-field noise at low frequencies, but it changes the cardioid directivity pattern associated with radiation from straight-edge scattering at high frequencies to a tilted dipolar pattern.

Influence of 3D-printed collimator thickness on near-the-edge scattering of high-energy electrons

2020 ◽  
Vol 15 (04) ◽  
pp. C04023-C04023
Author(s):  
S.G. Stuchebrov ◽  
A.A. Bulavskaya ◽  
Yu.M. Cherepennikov ◽  
E. Gargioni ◽  
A.A. Grigorieva ◽  
...  
Keyword(s):  
High Energy ◽  
High Energy Electrons ◽  
Edge Scattering ◽  
3D Printed

scholarly journals Edge scattering of surface plasmons excited by scanning tunneling microscopy

2013 ◽  
Vol 21 (12) ◽  
pp. 13938 ◽  
Author(s):  
Yang Zhang ◽  
Elizabeth Boer-Duchemin ◽  
Tao Wang ◽  
Benoit Rogez ◽  
Geneviève Comtet ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Surface Plasmons ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Edge Scattering

Resolution Performance of Programmable Proximity Aperture MeV Ion Beam Lithography System

2007 ◽  
Vol 1020 ◽  
Author(s):  
Sergey Gorelick ◽  
Timo Sajavaara ◽  
Mikko Laitinen ◽  
Nitipon Puttaraksa ◽  
Harry J. Whitlow
Keyword(s):  
Heavy Ions ◽  
Ion Beam ◽  
Computer Control ◽  
Object Oriented ◽  
Linear Motion ◽  
Ion Beam Lithography ◽  
Edge Scattering ◽  
Edge Sharpness ◽  
The University ◽  
Lithography System

AbstractAn ion beam lithography system for light and heavy ions has been developed at the University of Jyväskylä's Accelerator Laboratory. The system employs a programmable proximity aperture to define the beam. The proximity aperture is made up of four Ta blades with precise straight edges that cut the beam in the horizontal and vertical directions. The blade positions and dimensions are controlled by a pair of high-precision linear-motion positioners. The sample is mounted on a X-Y-Z stage capable of moving with 100 nm precision steps under computer control. The resolution performance of the system is primarily governed by the proximity aperture. Pattern edge sharpness is set by the beam divergence, aperture blade straightness, and secondary and scattered particles from the aperture blade edges. Ray tracing simulations using the object oriented toolkit GEANT4 were performed to investigate the beam spatial resolution on the sample defined by the proximity aperture. The results indicate that the edge-scattering does not significantly affect the pattern edge sharpness.

High Lift Device Modifications for Reducing Airport Noise - A Review

2021 ◽  
Vol 263 (6) ◽  
pp. 635-640
Author(s):  
Daryoush Allaei ◽  
Benjamin Reydel ◽  
James Rall
Keyword(s):  
Negative Impact ◽  
Environmental Issues ◽  
Air Transportation ◽  
Aircraft Noise ◽  
Operating Costs ◽  
Noise Levels ◽  
Structural Vibrations ◽  
High Lift ◽  
Community Acceptance ◽  
Edge Scattering

Aircraft noise has been one of the top environmental issues at and near airports across the country because of its negative impact on communities. The growth of the nation's air transportation system is restricted predominantly due to regulations on limiting aircraft noise generated around airports. Reducing aircraft noise will lead to wider community acceptance of new or larger airports, lower airline operating costs by reducing noise quota fees, and increase air traffic growth through operating more flights. One of the most significant contributors to aircraft noise, structural vibrations caused by air flow across its frame, are high lift devices. A review of high lift devices, such as flaps, and methods to reduce their noise levels will be presented. Solution reviews will focus on reducing flap trailing-edge scattering and flap side-edge vortices.

Elastic scattering in thick targets and edge scattering

1988 ◽  
Vol 37 (11) ◽  
pp. 3292-3307 ◽  
Author(s):  
A. Van Ginneken
Keyword(s):  
Elastic Scattering ◽  
Edge Scattering
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