Results 201 to 210 of about 1,036,598 (264)

Frequency-Domain and Spatial-Domain Reconfigurable Metasurface

ACS Applied Materials & Interfaces, 2020
The recently proposed digital reconfigurable metasurfaces make it possible to manipulate electromagnetic (EM) waves flexibly. However, most existing reconfigurable metasurfaces can only exhibit a relatively single performance in the spatial domain.
Guang Yao Liu, Long Li, Jia Qi Han, Hai Xia Liu, Xiao He Gao, Yan Shi, Tie Jun Cui   +6 more
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Frequency domain Nonlinear Optics

Nonlinear Optics, 2017
Frequency-domain Nonlinear Optics (FNO) merges the simplicity of linear optics with the power of nonlinear optics. Employing FNO, we demonstrate pulse shaping in the deep UV and amplification of two-cycle infrared pulses to 2.5 TW.
Schmidt B. E., Gruson V., Lassonde P., Ernotte G., Leblanc A., Clerici M., Morandotti R., DiMauro L., Corkum P. B., Ibrahim H., Legare   +10 more
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Frequency-domain Hadamard spectroscopy

Journal of Magnetic Resonance, 2003
A new technique is proposed for multichannel excitation and detection of NMR signals in the frequency domain, an alternative to the widely used pulse-excited Fourier transform method. An extensive array of N radiofrequency irradiation channels covers the spectrum of interest.
Eriks, Kupce, Ray, Freeman
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Frequency Domain

2019
Time series analysis in frequency domain has always been an active area of research. Theorists often employ techniques in frequency domain to advance current understanding on complex time series properties and develop useful toolboxes for practical time series analysis.
Chan, Felix, Reale, M.
openaire   +2 more sources

Frequency-Domain Transient Imaging

IEEE Transactions on Pattern Analysis and Machine Intelligence, 2017
A transient image is the optical impulse response of a scene, which also visualizes the propagation of light during an ultra-short time interval. In contrast to the previous transient imaging which samples in the time domain using an ultra-fast imaging system, this paper proposes transient imaging in the frequency domain using a multi-frequency time-of-
, Jingyu Lin, , Yebin Liu, , Jinli Suo, , Qionghai Dai   +3 more
openaire   +2 more sources

Frequency domain chaotic watermarking

ISCAS 2001. The 2001 IEEE International Symposium on Circuits and Systems (Cat. No.01CH37196), 2002
A watermarking procedure to be applied in the frequency domain to digital images has been proposed and investigated, with purpose of copyright protection. The selected digital signature is a chaotic sequence embedded by considering a shaping function to weight in different manner each sequence value, as a function of the image properties in the ...
GIOVANARDI, Alessandra, MAZZINI, Gianluca   +1 more
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Effective frequency-domain ADC testing

IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, 2000
Frequency domain based analog-to-digital converter testing is addressed in this brief. It proposes a design technique based on a suitable class of window functions. The resulting testing procedure is characterized by robustness to model uncertainties, high accuracy, low computational burden, and ease of use.
CARBONE, Paolo, D. Petri
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Frequency Domain Interpolation

IEEE Transactions on Aerospace and Electronic Systems, 1977
A formula is derived for interpolation between output samples of a fast Fourier transform (FFT), i.e., in the frequency domain. Such a formula is useful for obtaining greater frequency resolution when two coarse FFT outputs are available. Consideration is also given to the effect of such interpolation on a weighted FFT.
C.T. Leondes, D.D. Rivers
openaire   +1 more source

The Ultrahigh-Frequency Domain

Transactions of the American Institute of Electrical Engineers, 1937
Use of ultrahigh frequencies for educational broadcasting has been thought to offer attractive possibilities because of the supposedly almost unlimited number of channels; however, the demands of other radio services, particularly television, may be expected to congest this newly opened region. Ultrahigh-frequency waves behave somewhat like light waves,
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Frequency Domain Analysis

2014
So far, we have mostly examined the response of dynamic systems to relatively simple inputs: impulses, steps, and ramps. While we have used Matlab ® to calculate the response of systems to more complex inputs numerically, there are also analytical methods that can be used to identify the response of systems to inputs of a general form.
Matthew A. Davies, Tony L. Schmitz
openaire   +2 more sources