Results 241 to 250 of about 1,964,125 (283)
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The CSF pulse wave in hydrocephalus
Child's Nervous System, 1985Twenty-one dogs were rendered hydrocephalic by the intracisternal injection of kaolin. After various intervals between 1 and 44 days the animals were anesthetized for the measurement of arterial (lingual), ventricular, and sagittal sinus pressures. Following the recordings the animals were sacrificed by formalin infusion, the brains sectioned serially,
H D, Portnoy, C, Branch, M, Chopp
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Pulse wave velocities in the aorta
Bulletin of Mathematical Biology, 1984This paper is an analytical study on the pulse wave velocities in the aorta. In conformity to a physiologic state of loading, the distensibility of the vessel wall has been accounted for. The wall material is treated by using the theory of large elastic deformations. The orthotropicity of wall tissues and the effect of the surrounding tissues have been
Misra, J. C., Singh, S. I.
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Reproducibility of pulse wave velocity and augmentation index measured by pulse wave analysis
Journal of Hypertension, 1998The aim of this study was to determine the reproducibility of pulse wave velocity (PWV) and augmentation index (AIx) measured using pulse wave analysis (PWA), prior to its use in large-scale clinical trials.Arterial pressure waveforms were recorded and analysed using an established technique (Sphygmocor). Subjects with and without a range of recognized
I B, Wilkinson +6 more
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Pulse Wave Velocity and Pulse Wave Analysis in Experimental Animals
2012Until a few years ago, pulse wave velocity in experimental animals (mice, rats, rabbits, etc.) could only be measured by invasive methods. The carotid or femoral artery was surgically isolated and catheterized to assess intra-arterial pressure. The carotid and femoral signals were measured simultaneously, and the pulse wave transit time was then ...
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Wave Travel and Pulse Wave Velocity
2018Waves generated by the heart travel down the aorta and major conduit arteries. These waves are pressure waves, flow or velocity waves or diameter waves. The ratio of the distance Δx, and the time it takes for the foot of the wave to travel over this distance, Δt, gives the wave speed or pulse wave velocity, PWV=Δx/Δt.
Nicolaas Westerhof +3 more
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Instruments for Pulse Wave Analysis and Measurement of Pulse Wave Velocity
2012Over the last few years, a lot of new instruments for pulse wave analysis or measurement of pulse wave velocity have been launched onto the market. It seems that their main aim is to supply operator-independent devices, which can perform faster, while the accuracy of the measurement or the scientific soundness of the algorithms used are of secondary ...
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Wave collapse and optical-pulse compression
Physical Review A, 1993The past several decades of development of nonlinear optics clearly demonstrated an important role playing by universal nonlinear models. Simply formulated, but, at the same time, rich in content, the models such as the nonlinear Schrödinger equation, the sine-Gordon equation, the system describing three-wave resonant interaction, and others occur in a
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Four-wave mixing with femtosecond pulses
Physica Scripta, 2009The recent development of noncollinear optical parametric amplifiers (NOPAs) has equipped many laboratories with widely tunable, spectrally broad ultrashort laser pulses with a duration of 15-30 fs. The present work deals with sub-20 fs pulsed degenerate four wave mixing (DFWM) on high-frequency vibrational levels in all-trans-beta-carotene.
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Textile Triboelectric Nanogenerators for Wearable Pulse Wave Monitoring
Trends in Biotechnology, 2021Jun Chen, Jun Chen, Christian Au
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