Results 31 to 40 of about 1,274,578 (287)

Study on the ultra-wide band gap characteristics of novel star-shaped chiral metamaterials

Hangkong gongcheng jinzhan
The suppression of vibration and noise has always been an important issue in engineering，and metamaterials have shown significant application value in vibration and noise reduction.
WANG Shuo, YAN Qun, YAN Hao, SUN Yongtao, WANG Anshuai, ZHANG Zhaozhan, DING Qian, WANG Liang   +7 more
doaj   +1 more source

On the age heterogeneity of the Pleiades, Hyades and Sirius moving groups [PDF]

, 2007
We investigate the nature of the classical low-velocity structures in the local velocity field, i.e. the Pleiades, Hyades and Sirius moving groups. After using a wavelet transform to locate them in velocity space, we study their relation with the open ...
A. Jorissen, A. Siebert, Arifyanto, B. Famaey, Bensby, Chakrabarty, Chereul, Chereul, Daflon, De Silva, De Silva, De Simone, Dehnen, Dehnen, Dettbarn, Ecuvillon, Eggen, Eggen, Eggen, Eggen, Famaey, Famaey, Freeman, Fux, Helmi, Lejeune, Luri, Montes, Nordström, Platais, Quillen, Raboud, Schaller, Woolley   +33 more
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A Comprehensive Investigation of the Two-Phonon Characteristics of Heat Conduction in Superlattices

Crystals
The Anderson localization of phonons in disordered superlattices has been proposed as a route to suppress thermal conductivity beyond the limits imposed by conventional scattering mechanisms.
Pranay Chakraborty, Milad Nasiri, Haoran Cui, Theodore Maranets, Yan Wang   +4 more
doaj   +1 more source

Hermiticity-tunable beam reshaping: localization, recurrence and group velocity oscillation

New Journal of Physics, 2019
We propose a novel method to reshape the light beam in a Hermiticity-tunable photonic lattice with PT symmetric perturbations. By adjusting the PT perturbations, the Hermiticity of the system varies alternatively, further resulting in the periodic ...
Kaiwen Ji, Zhenjuan Liu, Yanan Dai, Yuanmei Gao, YiShan Wang, Jintao Bai, Guoquan Zhang, Xinyuan Qi   +7 more
doaj   +1 more source

Some Theorems in Group Velocity [PDF]

Proceedings of the Edinburgh Mathematical Society, 1956
We consider a medium in which the equation satisfied by a disturbance ø(x,t) is capable of solutions of the form sin(vx—wt), with v and ω real but not necessarily of the same sign. If the phase velocity U = ω/v is not of constant magnitude the medium is said to be dispersive, and the group velocity V may conveniently be defined as dω/v, an expression ...
openaire   +2 more sources

Group velocity study in hot Rb vapor with buffer gas

, 2003
We study the behavior of the group velocity of light under conditions of electromagnetically induced transparency (EIT) in a Doppler broadened medium.
Mikhailov, Eugeniy E., Rostovtsev, Yuri V., Welch, George R.   +2 more
core   +1 more source

Temperature Variation of Ultra Slow Light in a Cold Gas [PDF]

, 1999
A model is developed to explain the temperature dependence of the group velocity as observed in the experiments of Hau et al (Nature {\bf397}, 594 (1999)). The group velocity is quite sensitive to the change in the spatial density.
A. Kasapi, A.S. Parkins, E.V. Goldstein, F. Dalfovo, H. Pu, H. Shi, J. Martińez-Linares, J. Tempere, J.D. Jackson, K. Huang, K.B. Davis, L.V. Hau, M.H. Anderson, M.M. Kash, M.O. Scully, M.R. Andrews, N.B. Delone, N.J. van Druten, O. Schmidt, S. Grossman, S. Grossmann, S. Stringari, S.E. Harris, W. Ketterle   +23 more
core   +4 more sources

Differential Kernels for Group Velocity [PDF]

Geophysical Journal International, 1976
Summary It is shown that the wavenumber dcrivative of the dispersion relation, dω(k)/dk, is a Frkchet differentiable gross Earth datum. The differential kernel functions are given explicitly as expressions quadratic in the normal mode eigenfknctions and their wavenumber derivatives.
openaire   +2 more sources

Fully nonlinear inversion of fundamental mode surface waves for a global crustal model [PDF]

, 2007
We use neural networks to find 1-dimensional marginal probability density functions (pdfs) of global crustal parameters. The information content of the full posterior and prior pdfs can quantify the extent to which a parameter is constrained by the data.
A. Curtis, Bassin, Beghein, Boschi, Brocher, Christensen, Devilee, Ekström, J. Trampert, Meier, Mitra, Montagner, Mosegaard, Ritzwoller, Sambridge, Sambridge, Shapiro, Tarantola, Tarantola, Trampert, U. Meier, Woodhouse   +21 more
core   +1 more source

Randomized, Open-Label Phase 3 Study Evaluating Immunogenicity, Safety, and Reactogenicity of RSVPreF3 OA Coadministered with FLU-QIV-HD in Adults Aged ≥ 65

Infectious Diseases and Therapy
Introduction Respiratory syncytial virus (RSV) and influenza pose major disease burdens in older adults due to an aging immune system and comorbidities; seasonal overlap exists between these infections.
Robert Buynak, Kevin Cannon, David DeAtkine, John Kirby, Lisa Usdan, Amit Bhavsar, Catherine Gérard, Anastasia Kuznetsova, Amulya Jayadev, Hiwot Amare, Sofia Valenciano, Nadia Meyer   +11 more
doaj   +1 more source