scholarly journals Near‐field approach towards enhanced suppression of cross‐polarised radiation across different elevation planes using novel epsilon‐shaped clusters of shorting pins

2019 ◽  
Vol 13 (7) ◽  
pp. 966-975 ◽  
Author(s):  
Susamay Samanta ◽  
Kaushik Mandal ◽  
P. Soni Reddy ◽  
Partha P. Sarkar
Keyword(s):  
Near Field ◽  
Field Approach

The new near-field approach for microwave tomography of absorbing media

2019 ◽  
Vol 126 (10) ◽  
pp. 105101 ◽  
Author(s):  
Vladimir P. Yakubov ◽  
Victor P. Belichenko ◽  
Sergey E. Shipilov ◽  
Aleksandr S. Mironchev ◽  
Andrey V. Klokov ◽  
...  
Keyword(s):  
Near Field ◽  
Microwave Tomography ◽  
Field Approach ◽  
Absorbing Media

Near-Field Uniform Beams for Pulsed Doppler Ultrasound

1980 ◽  
Vol 2 (4) ◽  
pp. 324-337 ◽  
Author(s):  
Chong-Cheng Fu ◽  
Sharbel E. Noujaim ◽  
Robert S. Jaffe ◽  
Levy Gerzberg ◽  
Roger D. Melen
Keyword(s):  
Flow Measurement ◽  
Pattern Analysis ◽  
Ultrasonic Transducer ◽  
Near Field ◽  
Ultrasonic Field ◽  
Beam Pattern ◽  
Field Approach ◽  
Pulsed Doppler Ultrasound ◽  
Pulsed Ultrasonic

A mathematical model for the beam pattern of a pulsed ultrasonic transducer is introduced. Beam-pattern analysis and simulation of a circular transducer based on this model agree well with the experimental results. It is demonstrated that, in its near field, the pulsed transducer is capable of generating a good approximation to a uniform ultrasonic field which cannot be achieved with a cw transducer. Preliminary error analysis indicates that the near-field beam pattern of the pulsed transducer is suitable for quantitative blood-flow measurement, and design criteria are developed for this application. A prototype has been fabricated and tested in in-vitro experiments, and the results verify the feasibility of the quantitative blood flowmeter principle and the pulsed-transducer near-field approach to the formation of uniform beams.

A traditional Near Field-Far Field approach-based model and a spreadsheet workbook to manage Oxygen Deficiency Hazard

2021 ◽  
Vol 149 ◽  
pp. 537-556
Author(s):  
Elena Stefana ◽  
Filippo Marciano ◽  
Daniel Drolet ◽  
Thomas W. Armstrong
Keyword(s):  
Oxygen Deficiency ◽  
Near Field ◽  
Far Field ◽  
Field Approach

A system of hidden quantum dots in the magnetic field: a near-field approach

2004 ◽  
Vol 16 (4) ◽  
pp. 543-552 ◽  
Author(s):  
Yu Demidenko ◽  
A Kuzyk ◽  
V Lozovski ◽  
O Tretyak
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Near Field ◽  
Field Approach ◽  
The Magnetic Field

Disentangling time in a near-field approach to scanning probe microscopy

Nanoscale ◽  
2011 ◽  
Vol 3 (9) ◽  
pp. 3589 ◽  
Author(s):  
Marco Farina ◽  
Agnese Lucesoli ◽  
Tiziana Pietrangelo ◽  
Andrea di Donato ◽  
Silvia Fabiani ◽  
...  
Keyword(s):  
Scanning Probe Microscopy ◽  
Near Field ◽  
Scanning Probe ◽  
Probe Microscopy ◽  
Field Approach

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.

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