Results 21 to 30 of about 2,395,426 (302)
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
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Gravitational waves propagating into Friedmann--Robertson--Walker universes [PDF]
, 1996 We consider space-times with two isometries which represent gravitational waves with distinct wavefronts which propagate into exact Friedmann-Robertson-Walker (FRW) universes.
Bicak, Jiri, Griffiths, Jerry B.
core +3 more sources
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
doaj +1 more source
Philosophical Transactions of the Royal Society B: Biological Sciences, 2004 Waves through living systems are best characterized by their speeds at 20°C. These speeds vary from those of calcium action potentials to those of ultraslow ones which move at 1–10 and/or 10–20 nm s−1. All such waves are known or inferred to be calcium waves.
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
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
IEEE Access, 2020 A novel dual-band patch antenna operating at 28/38 GHz is proposed for multiple-input multiple-output (MIMO) communication systems in this paper. The antenna utilizes substrate integrated waveguide (SIW) transmission line as the feed by means of a ...
Pengfei Liu +5 more
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A compact high‐sensitivity tangential E‐probe with resonator and coupled balun
Electronics Letters, 2022 A compact high‐sensitivity probe for sensing up tangential E‐field is proposed and measured in this paper. The probe consists of an electric dipole with patches used to induce the tangential E‐field, a resonator made up of open circuit stubs (capacitor ...
Shang Zhang +4 more
doaj +1 more source
The geometry of a naked singularity created by standing waves near a Schwarzschild horizon, and its application to the binary black hole problem [PDF]
, 2005 The most promising way to compute the gravitational waves emitted by binary black holes (BBHs) in their last dozen orbits, where post-Newtonian techniques fail, is a quasistationary approximation introduced by Detweiler and being pursued by Price and ...
C. W. Misner +3 more
core +2 more sources
Reverse Doppler effect in backward spin waves scattered on acoustic waves
, 2009 We report on the observation of reverse Doppler effect in backward spin waves reflected off of surface acoustic waves. The spin waves are excited in a yttrium iron garnet (YIG) film. Simultaneously, acoustic waves are also generated.
A. A. Serga +12 more
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