Computational Analysis of Vortex Wakes Without Near-Field Rollup Characteristics

2018 ◽  
Vol 55 (5) ◽  
pp. 2008-2021 ◽  
Author(s):  
Prateek Ranjan ◽  
Phillip J. Ansell
Keyword(s):  
Computational Analysis ◽  
Near Field

Computational Analysis of a Wingtip Vortex in the Near-Field

2009 ◽  
Author(s):  
Rajani Satti ◽  
Yanbing Li ◽  
Richard Shock ◽  
Brad Duncan
Keyword(s):  
Computational Analysis ◽  
Near Field ◽  
Wingtip Vortex

Electromagnetic Radiation From the Detonation of Metal Encased Explosives

2011 ◽  
Author(s):  
W. T. Brown ◽  
M. F. Schmidt ◽  
P. T. Dzwilewski
Keyword(s):  
Electromagnetic Radiation ◽  
Electric Fields ◽  
Computational Analysis ◽  
Fragment Size ◽  
Near Field ◽  
Time Dependent ◽  
Far Field ◽  
Fragment Size Distribution ◽  
Metal Fracture ◽  
Electromagnetic Emissions

Electromagnetic radiation accompanying the detonation of chemical explosives was first reported in 1954. Such emissions result from detonations of both bare and cased explosives. However, the dominant wavelengths of emissions from these two types of explosions generally differ by as much as three or four orders of magnitude. We present results of far-field and near-field experimental measurements of electric fields emitted by metal encased explosives, and show that metal fracture is the dominant mechanism leading to these emissions. Additionally, we present results of computational analysis of explosive fracture of steel cylinders performed to investigate the correlation between the time-dependent fragment size distribution and the pattern of electromagnetic emissions.

Near-field scanning optical microscopy

1986 ◽  
Vol 44 ◽  
pp. 642-643
Author(s):  
E. Betzig ◽  
A. Harootunian ◽  
M. Isaacson ◽  
A. Lewis
Keyword(s):  
Near Field ◽  
Optical Microscope ◽  
Visible Radiation ◽  
Field Methods ◽  
Optical Elements ◽  
Optical Region ◽  
Order Of Magnitude ◽  
Nondestructive Imaging ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning

In general, conventional methods of optical imaging are limited in spatial resolution by either the wavelength of the radiation used or by the aberrations of the optical elements. This is true whether one uses a scanning probe or a fixed beam method. The reason for the wavelength limit of resolution is due to the far field methods of producing or detecting the radiation. If one resorts to restricting our probes to the near field optical region, then the possibility exists of obtaining spatial resolutions more than an order of magnitude smaller than the optical wavelength of the radiation used. In this paper, we will describe the principles underlying such "near field" imaging and present some preliminary results from a near field scanning optical microscope (NS0M) that uses visible radiation and is capable of resolutions comparable to an SEM. The advantage of such a technique is the possibility of completely nondestructive imaging in air at spatial resolutions of about 50nm.

Principles of Planar Near-Field Antenna Measurements

2007 ◽  
Author(s):  
Stuart Gregson ◽  
John McCormick ◽  
Clive Parini
Keyword(s):  
Near Field ◽  
Antenna Measurements

Measurement and Three-Dimensional Computational Analysis for Flow Electrification in Complex-Shaped Ducts

2016 ◽  
Vol 136 (3) ◽  
pp. 318-324
Author(s):  
Naoya Miyamoto ◽  
Makoto Koizumi ◽  
Hiroshi Miyao ◽  
Takayuki Kobayashi ◽  
Kojiro Aoki
Keyword(s):  
Computational Analysis ◽  
Three Dimensional ◽  
Flow Electrification
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