RF pulse compression using helically corrugated waveguides by MacInnes, P, Ronald, K, Burt, G, Cross, A, Young, A, Phelps, A, Konoplev, I, He, W, Samsonov, S, Bratman, V, Denisov, G

“…The helically corrugated waveguide has a large variation of group velocity with frequency, but in a region where the group velocity remains large. …”

Development of X-band single-cell dielectric disk accelerating structures by B. Freemire, J. Shao, S. Weatherly, M. Peng, E. Wisniewski, S. Doran, W. Liu, C. Whiteford, X. Lu, S. Poddar, E. Gomez, J. Power, C. Jing

“…Accelerating structures with high group velocity (on the order of 0.1c) are required in this scheme to reduce the filling time so as to efficiently accelerate the main beam with multiple bunches. …”
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Regulation Mechanism of the Shock Waves in a Pentamode Lattice-Ring Structure Subjected to Collision by Zhenhua Zhang, Bangyi Han

“…The laws governing the effects of cellular structure parameters on group velocity anisotropy and pentamode characteristic parameters were also revealed. …”
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Tomography of crust and lithosphere in the western Indian Ocean from noise cross-correlations of land and ocean bottom seismometers by Hable, S, Sigloch, K, Stutzmann, E, Kiselev, S, Barruol, G

“…The 100 highest-quality group velocity curves are selected for tomographic inversion at crustal and lithospheric depths. …”

“Fast” Plasmons Propagating in Graphene Plasmonic Waveguides with Negative Index Metamaterial Claddings by Zeyang Zhao, Shaojian Su, Hengjie Zhou, Weibin Qiu, Pingping Qiu, Qiang Kan

“…A forbidden band appears between the negative and positive group velocity regions, which is enhanced gradually as the width of the core increases. …”
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Determination of Lamb Wave Modes on Lithium-Ion Batteries Using Piezoelectric Transducers by Markus Koller, Gregor Glanz, Alexander Bergmann, Hartmut Popp

“…To determine the type of mode and the group velocity at a specific frequency, two- and three-transducer setups were created. …”
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Cylindrical photonic crystals by Ibanescu, Mihai, 1977-

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Analog Signal Processing in Transmission Line Metamaterial Structures by S. Gupta, C. Caloz

“…These systems are either guided-wave or radiated-wave systems, and employ either the group velocity or the group velocity dispersion parameters. …”
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Observation of THz evanescent waves in a Smith-Purcell free-electron laser by H. L. Andrews, C. A. Brau, J. D. Jarvis, C. F. Guertin, A. O’Donnell, B. Durant, T. H. Lowell, M. R. Mross

“…These waves, predicted by both theory and simulations, have wavelengths longer than the Smith-Purcell radiation, group velocity antiparallel to the electron beam, and for sufficiently high current, provide feedback to bunch the electron beam. …”
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Wave packet tunneling and imaginary wave vector dispersion by Walter Unglaub, A.F.J. Levi

“…The imaginary k-space dispersion in a tunnel barrier may be viewed as a filter that controls the arrival time, shape, and group velocity of a transmitted wave packet. This k-space filter can be designed to increase or decrease the group velocity of the transmitted pulse and a transmitted peak-pulse probability arrival time can be engineered to occur before or after that of an electron wave packet propagating in the absence of the tunnel barrier.…”
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Automated detection and association of surface waves by C. R. D. Woodgold, R. G. North

“…Regional calibration of group velocity and azimuth is required. . Large variations in both group velocity and azimuth corrections were found, as an example, signals from events in Fiji Tonga arrive with apparent group velocities of 2.9 3.5 krn/s and azimuths from 5 to + 40 degrees clockwise from true (great circle) azimuth, whereas signals from Kuriles Kamchatka have velocities of 2.4 2.9 km/s and azimuths off by 35 to 0 degrees. …”
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Delineation of upper crustal structure beneath the island of Lombok, Indonesia, using ambient seismic noise tomography by Sarjan, Achmad F. N., Zulfakriza, Zulfakriza, Nugraha, Andri D., Shindy Rosalia, Wei, Shengji, Widiyantoro, Sri, Cummins, Phil R., Muzli, Muzli, Sahara, David P., Puspito, Nanang T., Priyono, Awali, Afif, Haunan

“…We used frequency-time analysis (FTAN) to acquire the interstation group velocity from the dispersion curves. Group velocity was obtained for the period range of 1 s to 6 s. …”
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Analysis of the interaction between torsion wave and phononic crystal in pipes by Boris I, Jaesun Lee

“…The unit cell of the presented structure was meticulously examined to obtain dispersion curves, revealing the presence of bandgaps and negative group velocities. The calculations of effective material parameters, based on eigenfrequencies, are presented to substantiate the existence of the bandgap and the negative value of group velocity. …”
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Observation of Magnon Bound States in the Long-Range, Anisotropic Heisenberg Model by Florian Kranzl, Stefan Birnkammer, Manoj K. Joshi, Alvise Bastianello, Rainer Blatt, Michael Knap, Christian F. Roos

“…For long-range interactions with the experimentally realized power-law exponent, the group velocity of magnons is unbounded. Nonetheless, for sufficiently strong interactions, we observe bound states of these unconventional magnons which possess a nondiverging group velocity. …”
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Two-Dimensional Attenuation and Velocity Tomography of Iran by Thomas M. Hearn

“…Seismic bulletin data collected by the Iranian Seismological Center are used to image crust and mantle seismic attenuation, group velocity, and phase velocities for Lg, Pg, Sn, and Pn phases. …”
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57-fs, Er-doped all-fiber all-polarization-maintaining amplifier based on a hybrid DCF/FBG scheme for dispersion compensation by Kuo Meng, Shuchao Sun, Mohan Li, Zengchao Wang

“…By evaluation of pulse shaping, one third of group velocity dispersion in the amplifier was compensated by the pair of gratings, and the remained amount compensated by the dispersion compensation fiber.…”
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First determination of whistler wave dispersion relation in superhot (T_{e}>5keV) plasmas by W. Z. Zhang, H. S. Fu, J. B. Cao, Z. Wang, W. D. Fu, Y. Y. Liu, Y. Yu

“…Especially in high-temperature mediums, the group velocity dispersion properties of whistlers are still unverified by spacecraft experiments despite their practical importance. …”
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Wave Patterns of Gravity–Capillary Waves from Moving Localized Sources by Vladimir Gnevyshev, Sergei Badulin

“…We detail characteristic angles of the wake patterns: (i) angle of demarcation of gravity and capillary waves—“the phase Mach” cone, (ii) angle of the minimal group velocity of gravity–capillary waves—“the group Mach” cone, (iii, iv) angles of cusps of isophases that appear after a threshold current speed. …”
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Slow surface plasmon polaritons with a large normalized delay bandwidth product in an ultracompact metal gap superlattice by Li, Chunlei, Zhang, Xueru, Wang, Yuxiao, Song, Yinglin, Kong, Degui, Wang, Yueke

“…We propose a metal gap superlattice that can decrease the group velocity of surface plasmon polaritons (SPPs) with a large normalized delay bandwidth product (NDBP) and small high-order dispersion. …”
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Negative refraction of elastic waves in two-dimensional inertial amplification metamaterials by Zhao, Cheng, Li, Yue, Deng, Zichen, Wang, Yifan, Zhang, Kai

“…The positive (negative) inertia of the system can be tuned by the IA angle, which determines whether the passband of the lattice is positive (negative) group velocity. By analyzing the dispersion relations of the 2D IAMs, we find that the IA angle 45° is the critical point where the group velocity flips. …”
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