Results 11 to 20 of about 204,662 (249)

Square Wave Quadrature Amplitude Modulation for Visible Light Communication Using Image Sensor

open access: yesIEEE Access, 2019
Most visible light communication (VLC) technologies use a light emitting diode (LED) as a data transmitter and a photodiode as a receiver. In this paper, we alternatively focus on the use of an image sensor or camera as a receiver due to its wide ...
Syukron Abu Ishaq Alfarozi   +4 more
doaj   +3 more sources

Influence of Phase-Shifted Square Wave Modulation on Medium Frequency Transformer in a MMC Based SST

open access: yesIEEE Access, 2020
This article proposes an approach to identify intrinsic power losses of the medium frequency transformer that interfaces two modular multilevel converters (MMC) operated with phase-shifted square wave modulation (PS-SWM) to form a DC solid state ...
Rachit Agarwal, Sandro Martin, Hui Li
doaj   +3 more sources

Theoretical Analysis of Parameter Optimization for Lower-Ionosphere Excitation ELF/VLF Waves Based on Chirp-BOK Modulated Heating

open access: yesIEEE Access, 2020
To improve the anti-interference for ELF/VLF communication based on modulated heating lower-ionosphere, chirp spread spectrum technology with strong anti-interference is combined with square wave amplitude modulation, a novel method of chirp-BOK ...
Kaijie Zhou, Huali Wang, Peipei Cao
doaj   +1 more source

Magnetic bias-driven modulation of graphene for tunable gyrotropic and magnetoplasmon devices [PDF]

open access: yesAIP Advances
This work investigates the electromagnetic response of graphene subjected to a magnetic bias field under harmonic modulation. Two representative configurations are analyzed: a small square patch to examine scattering behavior, and a graphene microstrip ...
S. Amanatiadis   +4 more
doaj   +1 more source

Optimized Design of a Pump Laser System for a Spin Exchange Relaxation Free Inertial Measurement Device

open access: yesSensors, 2021
In order to improve the precision and beam quality of a pump laser for a spin exchange relaxation free inertial measurement device, we applied one scheme to achieve the square wave modulation and power stability control of the pump laser and another one ...
Jian Hao   +3 more
doaj   +1 more source

Analysis of Kapitza-Dirac diffraction patterns beyond the Raman-Nath regime [PDF]

open access: yes, 2009
We study Kapitza-Dirac diffraction of a Bose-Einstein condensate from a standing light wave for a square pulse with variable pulse length but constant pulse area.
Adams   +24 more
core   +1 more source

Sinusoidal and Relaxation Wide Range Voltage Controlled Oscillators

open access: yesCommunications, 2015
This paper presents a sinusoidal Wien-bridge and square wave wide range voltage controlled oscillators. The square wave oscillator is based on relaxation (Schmitt trigger) topology.
Milan Stork
doaj   +1 more source

Phase boom for an electromagnetic wave in a ferromagnet [PDF]

open access: yes, 1996
We study the propagation of an electromagnetic wave with a high intensity in a ferromagnetic medium, in a way analogous to the mathematical theory of nonlinear geometric optics.
H. Leblond
core   +2 more sources

Electronic spin-triplet nematic with a twist [PDF]

open access: yes, 2016
We analyze a model of itinerant electrons interacting through a quadrupole density-density repulsion in three dimensions. At the mean field level, the interaction drives a continuous Pomeranchuk instability towards $d$-wave, spin-triplet nematic order ...
Green, A. G.   +3 more
core   +2 more sources

Periodically and quasi-periodically driven dynamics of Bose-Einstein condensates

open access: yesSciPost Physics, 2020
We study the quantum dynamics of Bose-Einstein condensates when the scattering length is modulated periodically or quasi-periodically in time within the Bogoliubov framework.
Pengfei Zhang, Yingfei Gu
doaj   +1 more source

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