scholarly journals Radial modes of laterally stiffened piezoelectric disc transducers for ultrasonic collimated beam generation

Wave Motion ◽  
2018 ◽  
Vol 76 ◽  
pp. 19-27 ◽  
Author(s):  
Vamshi Krishna Chillara ◽  
Cristian Pantea ◽  
Dipen N. Sinha
Keyword(s):  
Beam Generation ◽  
Piezoelectric Disc ◽  
Collimated Beam

scholarly journals Low-frequency ultrasonic collimated beam generation from piezoelectric discs

2017 ◽  
Author(s):  
Vamshi Krishna Chillara ◽  
Cristian Pantea ◽  
Dipen N. Sinha
Keyword(s):  
Low Frequency ◽  
Beam Generation ◽  
Collimated Beam

scholarly journals Low-frequency ultrasonic Bessel-like collimated beam generation from radial modes of piezoelectric transducers

2017 ◽  
Vol 110 (6) ◽  
pp. 064101 ◽  
Author(s):  
Vamshi Krishna Chillara ◽  
Cristian Pantea ◽  
Dipen N. Sinha
Keyword(s):  
Low Frequency ◽  
Piezoelectric Transducers ◽  
Beam Generation ◽  
Collimated Beam

Inquiry into the Processes of Electron Beam Generation in a Magnetron Gun with Secondary-Emission Cathode

1999 ◽  
Vol 53 (4-5) ◽  
pp. 144-149
Author(s):  
N. I. Ayzatsky ◽  
A. N. Dovbnya ◽  
V. V. Zakutin ◽  
N. G. Reshetnyak ◽  
V. P. Romas'ko ◽  
...  
Keyword(s):  
Electron Beam ◽  
Secondary Emission ◽  
Electron Beam Generation ◽  
Beam Generation ◽  
Emission Cathode

Vortex Beam Generation Based on Plasma Reflect-Array Surface at Microwave Frequencies

2021 ◽  
pp. 1-7
Author(s):  
Ehsan Koohkan ◽  
Saughar Jarchi ◽  
Ayaz Ghorbani ◽  
Mohammad Bod
Keyword(s):  
Vortex Beam ◽  
Microwave Frequencies ◽  
Beam Generation

scholarly journals Multicriterial CNN based beam generation for robotic radiosurgery of the prostate

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Stefan Gerlach ◽  
Christoph Fürweger ◽  
Theresa Hofmann ◽  
Alexander Schlaefer
Keyword(s):  
Deep Learning ◽  
Treatment Planning ◽  
Treatment Plan ◽  
Plan Quality ◽  
New Approach ◽  
Beam Generation ◽  
Radiological Features ◽  
Improve Treatment ◽  
Robotic Radiosurgery ◽  
Treatment Plans

AbstractAlthough robotic radiosurgery offers a flexible arrangement of treatment beams, generating treatment plans is computationally challenging and a time consuming process for the planner. Furthermore, different clinical goals have to be considered during planning and generally different sets of beams correspond to different clinical goals. Typically, candidate beams sampled from a randomized heuristic form the basis for treatment planning. We propose a new approach to generate candidate beams based on deep learning using radiological features as well as the desired constraints. We demonstrate that candidate beams generated for specific clinical goals can improve treatment plan quality. Furthermore, we compare two approaches to include information about constraints in the prediction. Our results show that CNN generated beams can improve treatment plan quality for different clinical goals, increasing coverage from 91.2 to 96.8% for 3,000 candidate beams on average. When including the clinical goal in the training, coverage is improved by 1.1% points.

Use Of Non-collimated Beam For Determining The Focal Length Of A Lens By Talbot Interferomentry

1993 ◽  
Vol 22 (3) ◽  
pp. 61-66
Author(s):  
K. V. Sriram ◽  
M. P. Kothiyal ◽  
R. S. Sirohi
Keyword(s):  
Focal Length ◽  
Collimated Beam

scholarly journals High-Efficiency Polarizer Reflectarray Antennas for Data Transmission Links from a CubeSat

Electronics ◽  
2021 ◽  
Vol 10 (15) ◽  
pp. 1802
Author(s):  
Eduardo Martinez-de-Rioja ◽  
Daniel Martinez-de-Rioja ◽  
Rafael López-Sáez ◽  
Ignacio Linares ◽  
Jose A. Encinar
Keyword(s):  
Circular Polarization ◽  
Data Transmission ◽  
High Efficiency ◽  
High Gain ◽  
Dual Band ◽  
Left Handed ◽  
Linearly Polarized ◽  
Flat Profile ◽  
First Time ◽  
Collimated Beam

This paper presents two designs of high-efficiency polarizer reflectarray antennas able to generate a collimated beam in dual-circular polarization using a linearly polarized feed, with application to high-gain antennas for data transmission links from a Cubesat. First, an 18 cm × 18 cm polarizer reflectarray operating in the 17.2–22.7 GHz band has been designed, fabricated, and tested. The measurements of the prototype show an aperture efficiency of 52.7% for right-handed circular polarization (RHCP) and 57.3% for left-handed circular polarization (LHCP), both values higher than those previously reported in related works. Then, a dual-band polarizer reflectarray is presented for the first time, which operates in dual-CP in the frequency bands of 20 GHz and 30 GHz. The proposed antenna technology enables a reduction of the complexity and cost of the feed chain to operate in dual-CP, as a linear-to-circular polarizer is no longer required. This property, combined with the lightweight, flat profile and low fabrication cost of printed reflectarrays, makes the proposed antennas good candidates for Cubesat applications.

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