Results 241 to 250 of about 1,372,433 (300)

Experimental Laboratory Study on the Acoustic Response Characteristics of Fluid Flow in Horizontal Wells Based on Distributed Fiber Optic Sensing. [PDF]

Sensors (Basel)
Feng G, Yan Z, Li J, Ni Y, Li M, Li Z, Huang X, Li J, Liao Q, Liu X.   +9 more
europepmc   +1 more source

Nonlinear stability and vibration of flexible spacecraft solar arrays under thermally induced flutter during the penumbra phase. [PDF]

Sci Rep
Motaharifard O, Daneshjou K, Bakhtiari M.   +2 more
europepmc   +1 more source

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Gait phase varies over velocities

Gait & Posture, 2014
We sought to characterize the percent (PT) of the phases of a gait cycle (GC) as velocity changes to establish norms for pathological gait characteristics with higher resolution technology. Ninety five healthy subjects (49 males and 46 females with age 34.9 ± 11.8 yrs, body weight 64.0 ± 11.7 kg and BMI 23.5 ± 3.6) were enrolled and walked comfortably ...
Yancheng, Liu, Kun, Lu, Songhua, Yan, Ming, Sun, D Kevin, Lester, Kuan, Zhang   +5 more
openaire   +2 more sources

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
openaire   +3 more sources

MR Velocity Imaging by Phase Display

Journal of Computer Assisted Tomography, 1985
The ability of the nuclear magnetic resonance signal to encode information about macroscopic motion has been recognized since the works of Hahn and Carr and Purcell. In the medical imaging setting this ability has led to a variety of ingenious magnetic resonance flow imaging schemes that ultimately may become competitive with X-ray angiography in ...
V J, Wedeen, B R, Rosen, D, Chesler, T J, Brady   +3 more
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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
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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
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Superprism effect based on phase velocities

Optics Letters, 2004
The superprism effect has been studied in the past by use of the anomalous group velocities of optical waves in photonic crystals. We suggest the possibility of realizing agile beam steering based on purely phase-velocity effects. We present designs of photonic crystal prisms that might make experimental observation of this effect possible.
Chiyan, Luo, Marin, Soljacić, J D, Joannopoulos   +2 more
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Optical refraction in silver: counterposition, negative phase velocity and orthogonal phase velocity

European Journal of Physics, 2011
Complex behaviour associated with metamaterials can arise even in commonplace isotropic dielectric materials. We demonstrate how silver, for example, can support negative phase velocity and counterposition, but not negative refraction, at optical frequencies.
Qaisar A Naqvi, Tom G Mackay, Akhlesh Lakhtakia   +2 more
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