Results 271 to 280 of about 129,657 (313)
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On the velocity of pulsed beams
Proceedings of CAOL'2003. 1st International Conference on Advanced Optoelectronics and Lasers. Jontly with 1st Workshop on Precision Oscillations in Electronics and Optics (IEEE Cat. No.03EX715), 2004The article aims to find appropriate speed parameter to characterize short pulse beam propagation and analysis of possible mistakes in simulations and experiments. From the discussions, it is shown that for free space superluminal propagation is by the most part results of different mistakes.
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Pulse centroid velocity of the Poynting vector
Journal of the Optical Society of America A, 2004The evolution of the pulse centroid velocity of the Poynting vector for both ultrawideband rectangular and ultrashort Gaussian envelope pulses is presented as a function of the propagation distance in a dispersive, absorptive dielectric material. The index of refraction of the material is described by the Lorentz-Lorenz formula in which a single ...
Natalie A, Cartwright, Kurt E, Oughstun
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Velocity‐selective RF pulses in MRI
Magnetic Resonance in Medicine, 2005AbstractA family of velocity‐selective pulses consisting of a series of RF hard pulses followed by bipolar gradients was designed. The succession of required pulses was deduced using a k‐space approach within a small tip‐angle approximation. Fourier transform of the desired velocity excitation determined the flip‐angle series, and the corresponding ...
Ludovic, de Rochefort +3 more
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Pulse wave analysis and pulse wave velocity
Journal of Hypertension, 2003The study of the pulse using the technique of applanation tonometry is undergoing a resurgence with the development of new computerized equipment. We aim here to present a critical review of the uses, potential uses, strengths and weaknesses of the technique of applanation tonometry for the assessment of augmentation index and pulse wave velocity.
Davies, Justine Ina, Struthers, Allan D.
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Pulse Wave Velocity and Pulse Pressure in Patients With Arterial Hypertension
Kardiologiia, 2014The article is devoted to assessment of pulse pressure (PP) in female postmenopausal patients and patients with arterial hypertension (AH) older than 55 years. It is shown that in postmenopausal women even aged 55 years or less PP is one of most important parameters associated with target organ damage.
O A, Kisliak, A V, Starodubova
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Rinsho byori. The Japanese journal of clinical pathology, 2004
Pulse wave velocity (PWV) reflects arterial stiffness. PWV correlates with other markers reflecting the severity of atherosclerosis such as the findings of ultrasound examination of carotid artery. In addition, several studies demonstrated that increased PWV is a predictor of future cardiovascular events in patients with either hypertension or diabetes
Hirofumi, Tomiyama, Akira, Yamashina
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Pulse wave velocity (PWV) reflects arterial stiffness. PWV correlates with other markers reflecting the severity of atherosclerosis such as the findings of ultrasound examination of carotid artery. In addition, several studies demonstrated that increased PWV is a predictor of future cardiovascular events in patients with either hypertension or diabetes
Hirofumi, Tomiyama, Akira, Yamashina
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Carotid–femoral pulse wave velocity in the elderly
Journal of Hypertension, 2014Predictive value of arterial stiffness in cardiovascular disease has been recognized for many decades. Carotid-femoral pulse wave velocity (cfPWV), as a noninvasive measurement, has been recommended as a gold standard of arterial stiffness, and we believe that this surrogate of arterial stiffness has been refined to the point that its utility in ...
Zhang Y. +5 more
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Characterization Of A Cemented Sand With The Pulse–Velocity Method
17th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems, 2004The effect of variation in cement content, initial water content, void ratio, and curing time on wave velocity (low-strain property) and unconfined compressive strength (large-strain property) of a cemented sand is examined in this paper. The measured pulse velocity is compared with predictions made using empirical and analytical models, which are ...
Anwar Majid +4 more
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Pulse velocities in an orthotropic elastic tube
The Bulletin of Mathematical Biophysics, 1967Moens-Korteweg relations are developed for the velocity of wave propagation through an orthotropic elastic tube based on the three dimensional equations of elasticity. Numerical examples are presented for the femoral artery of a dog and several other orthotropic materials.
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Pulse Modulation Effect on Velocity Fringes
Applied Optics, 1975The degradation of a hologram caused by object motion can be utilized to measure the rate of change of the length of an object beam. A rectangular shaped laser pulse is ordinarily used to illuminate the object in such an investigation. The velocity fringes obtained are considered in the calculation.
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