Results 21 to 30 of about 2,258,641 (273)

Wave reflection at a stent

open access: yesProceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 2012
A simple analytical expression has been derived to calculate the characteristics of a wave that reflects at a stent implanted in a uniform vessel. The stent is characterized by its length and the wave velocity in the stented region. The reflected wave is proportional to the time derivative of the incident wave.
Crespo Martínez, Antonio   +2 more
openaire   +3 more sources

P138 Modelling and Simulation of Pressure Re-reflections at the Aortic Valve Using Difference Equations

open access: yesArtery Research, 2020
Introduction The concept of re-reflections of blood pressure waves at the heart has been neglected in most models and is only poorly understood so far.
Bernhard Hametner   +2 more
doaj   +2 more sources

Wave reflection in semiconductor nanostructures

open access: yesTheoretical and Applied Mechanics Letters, 2018
: Based on nonlocal thermoelastic theory, this article studies the reflection of waves in nanometer semi-conductor media. Firstly, the governing equations are established based on coupled nonlocal elasticity theory, plasma diffusion equation, and moving ...
Feixiang Tang, Yaqin Song
doaj   +1 more source

An Image Processing Method for Extraction of the Stress Wave Reflection Period

open access: yesApplied Sciences, 2020
The stress wave reflection method is widely used in the detection of structure size and integrity due to its advantages of low environmental impact and convenience.
Panpan Gong   +4 more
doaj   +1 more source

Normal Reflection Characteristics of One-Dimensional Unsteady Flow Shock Waves on Rigid Walls from Pulse Discharge in Water

open access: yesShock and Vibration, 2017
Strong shock waves can be generated by pulse discharge in water, and the characteristics due to the shock wave normal reflection from rigid walls have important significance to many fields, such as industrial production and defense construction.
Dong Yan, Jinchang Zhao, Shaoqing Niu
doaj   +1 more source

Reflected waves and quantum gravity

open access: yesPhysical Review D, 2023
In the context of canonical quantum gravity, we consider the effects of a non-standard expression for the gravitational wave function on the evolution of inflationary perturbations. Such an expression and its effects may be generated by a sudden variation in the (nearly constant) inflaton potential.
Leonardo Chataignier   +3 more
openaire   +3 more sources

Effect of Rosensweig instability in a ferrofluid layer on reflection loss of a high-frequency electromagnetic wave

open access: yesAIP Advances, 2022
A ferrofluid layer separates into numerous subscale crests, which is referred to as Rosensweig instability, whose shape and size depend on the field condition and the composition of the ferrofluid. A ferrofluid consisting of nanoscale magnetite particles
Yan-Hom Li, Kuo-Lung Huang
doaj   +1 more source

Limitations of augmentation index in the assessment of wave reflection in normotensive healthy individuals.

open access: yesPLoS ONE, 2013
ObjectivesAugmentation index (AIx) is widely used as a measure of wave reflection. We compared the relationship between AIx and age, height and sex with 'gold standard' measures of wave reflection derived from measurements of pressure and flow to ...
Alun D Hughes   +6 more
doaj   +1 more source

Physical Experimental Study on the Wave Reflection and Run-Up of a New Ecological Hollow Cube

open access: yesJournal of Marine Science and Engineering
Implementing quadrangular hollow blocks on breakwaters is a common method for wave mitigation and ocean disaster prevention. In order to improve the wave-damping performance of conventional quadrangular hollow blocks, a new quadrangular hollow block is ...
Haitao Zhao   +7 more
doaj   +1 more source

3D simulation of stress wave propagation in jointed rock mass with filling joint

open access: yesShuili Shuiyun Gongcheng Xuebao, 2020
In order to study the propagation characteristics of stress wave in rock mass with filling joints, the Three- Dimension Distinct Element Code was used to explore the influence of different occurrence joints on the penetration and reflection rules of P ...
DING Yingxun   +2 more
doaj   +1 more source

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