Results 21 to 30 of about 4,801,265 (322)
WAVE-WAVE INTERACTIONS, CURRENT-WAVE INTERACTIONS AND RESULTING EXTREME WAVES AND BREAKING WAVES
Coastal Engineering Proceedings, 1980 The influence of an opposing current on highly non-linear transient breaking waves in deep water is described quantitatively from experiments. 3 new parameters that describe crest front steepness and wave asymmetry are introduced. Further, joint probability density distributions are obtained from an analysis of field data containing nearly 25000 storm ...
Søren Peter Kjeldsen, Dag Myrhaug
openaire +2 more sources
Supershear Rayleigh waves at a soft interface [PDF]
, 2013 We report on the experimental observation of waves at a liquid foam surface propagating faster than the bulk shear waves. The existence of such waves has long been debated, but the recent observation of supershear events in a geophysical context has ...
Cobelli, Pablo +2 more
core +3 more sources
Shaping electromagnetic waves using software-automatically-designed metasurfaces
Scientific Reports, 2017 We present a fully digital procedure of designing reflective coding metasurfaces to shape reflected electromagnetic waves. The design procedure is completely automatic, controlled by a personal computer.
Qian Zhang +5 more
doaj +1 more source
Absorptive Microstrip-Fed Slot Antenna With Wide Reflectionless Band by Loading Bandstop Filter
IEEE Open Journal of Antennas and Propagation, 2021 This paper presents an absorptive microstrip-fed slot antenna with a wide reflectionless band and high radiation efficiency. The proposed antenna consists of a microstrip-fed slot antenna, a quarter-wavelength coupled-line bandstop filter (BSF), and ...
Yanqun Liu +4 more
doaj +1 more source
Cosmological backgrounds of gravitational waves [PDF]
Classical and quantum gravity, 2018 Gravitational waves (GWs) have a great potential to probe cosmology. We review early universe sources that can lead to cosmological backgrounds of GWs.
C. Caprini, Daniel G. Figueroa
semanticscholar +1 more source
Two-Dimensional Beam Steering Based on Compact Programmable Coding Metasurface
Applied Sciences, 2022 A programmable coding metasurface provides unprecedented flexibility to manipulate electromagnetic waves dynamically. By controlling the peculiarity of subwavelength artificial atoms, devices with metasurfaces perform various functionalities.
Fei Yang +6 more
doaj +1 more source
More Intense, More Frequent, and Longer Lasting Heat Waves in the 21st Century
Science, 2004 A global coupled climate model shows that there is a distinct geographic pattern to future changes in heat waves. Model results for areas of Europe and North America, associated with the severe heat waves in Chicago in 1995 and Paris in 2003, show that ...
G. Meehl, C. Tebaldi
semanticscholar +1 more source
An extension of the RiMAX multipath estimation algorithm for ultra-wideband channel modeling
EURASIP Journal on Wireless Communications and Networking, 2018 This work presents an extension of the high-resolution RiMAX multipath estimation algorithm, enabling the analysis of frequency-dependent propagation parameters for ultra-wideband (UWB) channel modeling. Since RiMAX is a narrowband algorithm, it does not
Brecht Hanssens +7 more
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Continuous-wave submillimeter-wave gyrotrons [PDF]
SPIE Proceedings, 2006 Recently, dynamic nuclear polarization enhanced nuclear magnetic resonance (DNP/NMR) has emerged as a powerful technique to obtain significant enhancements in spin spectra from biological samples. For DNP in modern NMR systems, a high power continuous-wave source in the submillimeter wavelength range is necessary. Gyrotrons can deliver tens of watts of
Seong-Tae, Han +10 more
openaire +2 more sources
Convolution operations on time-domain digital coding metasurface for beam manipulations of harmonics
Nanophotonics, 2020 Time-domain digital coding metasurfaces have been proposed recently to achieve efficient frequency conversion and harmonic control simultaneously; they show considerable potential for a broad range of electromagnetic applications such as wireless ...
Zhang Cheng +10 more
doaj +1 more source