Results 11 to 20 of about 6,965,165 (306)

The Application of Frequency Offset Advantage (FOA) in Frequency Coordination

open access: yes, 1979
International Telemetering Conference Proceedings / November 19-21, 1979 / Town and Country Hotel, San Diego, CaliforniaA major telecommunications growth area at this time is narrowband digital transmissions via satellites.
Raghavan, Srini, Armes, Jerry
core   +4 more sources

FFT Frequency-response Program (Data File 3)

open access: yes, 2022
 "Frequency-response program.csv" is  the FFT frequency response program based on Matlab 7.0.  
Kuo Li (1468930)
core   +1 more source

Frequency-Hopping Wave Engineering with Metasurfaces

open access: yes, 2023
Wave phenomena can be artificially engineered by scattering from metasurfaces, which aids in the design of radio-frequency and optical devices for wireless communication, sensing, imaging, wireless power transfer and bio/medical applications.
Daisuke Nita (16541400)   +4 more
core   +1 more source

Frequency-domain precoding for single carrier frequency-division multiple access [PDF]

open access: yes, 2009
At present there is considerable interest in the use of single carrier frequency-division multiple access. This interest is justified by the inherent single carrier structure of the SC-FDMA scheme, which is more robust against phase noise and has a lower
Nix, AR, Noune, MB
core   +1 more source

High Responsivity and Ultra-Low Detection Limits in Nonlinear a-Si:H p-i-n Photodiodes Enabled by Photogating

open access: yesPhotonic Sensors, 2023
Photodetectors operating at the wavelength in the visible spectrum are key components in high-performance optoelectronic systems. In this work, massive nonlinearities in amorphous silicon p-i-n photodiodes enabled by the photogating are presented ...
Andreas Bablich   +4 more
doaj   +1 more source

Investigation of Frequency Scanning Printed Bruce Array Antenna

open access: yesIEEE Access, 2020
A printed edge-fed counterpart of wire Bruce array antenna, with open-stopband mitigation at broadside, is presented. The proposed antenna comprises of 11 meandered unit-cells periodically modulated in congruence with wire Bruce array antenna's theory ...
Zeeshan Ahmed   +3 more
doaj   +1 more source

Toward Applicable EEG-Based Drowsiness Detection Systems: A Review

open access: yesFrontiers in Biomedical Technologies, 2022
Purpose: Drowsy driving accounts for many accidents and has attracted substantial research attention in recent years. Electroencephalography (EEG) signals are shown to be a reliable measure for the early detection of drowsiness.
Nasrin Sheibani Asl   +3 more
doaj   +1 more source

Frequency conversion based on three-wave parametric solitons [PDF]

open access: yes, 2010
Parametric three-wave mixing in quadratic nonlinear crystals provides a versatile means of achieving widely tunable frequency conversion of laser light, thus permitting a substantial extension of the wavelength coverage of laser sources across broad ...
Degasperis, Antonio   +17 more
core   +1 more source

High-Performance Metamaterial Light Absorption from Visible to Near-Infrared Assisted by Anti-Reflection Coating

open access: yesPhotonics, 2023
This study experimentally demonstrates two types of ultra-broadband metamaterial absorbers with high performance in the visible-to-near-infrared range by using different anti-reflection coatings (i.e., SiO2 and Si3N4) and a multi-subcell Ti-SiO2-Ti ...
Dongqing Wu   +4 more
doaj   +1 more source

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