Results 201 to 210 of about 264,807 (268)

Kinematic Characteristics of the Racket in Table Tennis During Backhand Flick Followed by Backhand Fast Block and Forehand Fast Block Combinations. [PDF]

Sensors (Basel)
Niu J, Gan C, May Teo X, Xue Y, Guo X, Ma W, Li H, Gao Z, Zhen Z.   +8 more
europepmc   +1 more source

Cusp-singularity-enhanced Coriolis effect for sensitive chip-scale gyroscopes. [PDF]

Nature
Zhang S, Xiao D, Wang F, Huang R, Yu L, Zhou N, He K, Wu X, Nori F, Jing H, Zhou X.   +10 more
europepmc   +1 more source

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Infinite phase velocity as the boundary between positive and negative phase velocities

Microwave and Optical Technology Letters, 2004
AbstractThe concept of infinite‐phase velocity (IPV) is shown as the boundary between positive‐ and negative‐phase velocities (PPVs and NPVs). As materials displaying PPV and NPV are physically realizable, we conjecture that this applies IPV materials as well. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 41: 165–166, 2004; Published online
Akhlesh Lakhtakia, Tom G. Mackay
openaire   +1 more source

Apparent phase velocities and fundamental-mode phase velocities of Rayleigh waves

Soil Dynamics and Earthquake Engineering, 2003
Abstract Rayleigh wave dispersion data usually appear in the form of multimodal spectra for a layered model structure. The number of dispersion modal curves depends on the number of layers in the model. The measured dispersion velocities from the frequency–wavenumber (F–K) space, however, may not represent the true phase velocities of the fundamental-
Shen, XK, Dai, FC, Zhang, SX, Chan, LS, Zhong, H, Chen, CY   +5 more
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On Einsteinian velocity addition and the notion of phase velocity

Proceedings of the IEEE, 1977
It is shown that conventional notions of the electromagnetic phase velocity in moving media are in general, inconsistent with the Einsteinian velocity addition. A new vector quantity, normalized phase slowness, is introduced and shown to be consistent with both the Lorentz transformation and the Einsteinian law of velocity addition.
Y. Rahmat-Samii, R.C. Menendez
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Measurements of phase velocity and group velocity in human calcaneus

Ultrasound in Medicine & Biology, 2000
Ultrasonic velocity in calcaneus correlates highly with bone mineral density, which is a good predictor of osteoporotic fracture risk. Several commercial bone sonometers perform a velocity measurement based on the transit time of a broadband pulse to assess skeletal status.
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Nonlinear waves with negative phase velocity

Physical Review E, 2009
Recently, waves propagating with negative phase velocity [simply called antiwaves (AWs)] have attracted great attention in the area of nonlinear oscillatory systems. In the present work we investigate the parameter conditions for AWs. So far AWs have been revealed from systems slightly beyond Hopf bifurcation or some other instabilities, and from some ...
Xiaoqing, Huang, Xuhong, Liao, Xiaohua, Cui, Hong, Zhang, Gang, Hu   +4 more
openaire   +2 more sources