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Reflection of Waves

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When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...

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$Interference and Diffraction$ 02:18

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Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.

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Assessing Cerebral Autoregulation via Oscillatory Lower Body Negative Pressure and Projection Pursuit Regression

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Arterial pressure fractality is highly dependent on wave reflection.

Ricardo L Armentano, Leandro J Cymberknop, Walter Legnani

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference

|October 11, 2013

Summary

Wave reflection significantly impacts arterial pressure complexity, measured by fractal dimension (FD). Reduced FD correlates with aortic stiffening and increased wave reflection, highlighting their interconnectedness.

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Area of Science:

Cardiovascular Physiology
Biomedical Engineering
Complex Systems Analysis

Background:

Wave reflection is crucial in determining arterial pressure wave morphology.
Aging exacerbates wave reflection, increasing cardiovascular risk.
Fractal dimension (FD) quantifies time series complexity in physiological signals.

Purpose of the Study:

To investigate the relationship between arterial pressure wave reflection and fractal dimension (FD).
To evaluate arterial pressure and diameter time series for insights into wave reflection dynamics.

Main Methods:

Simultaneous measurement of aortic pressure and diameter in 14 conscious dogs.
Utilized ultrasonic crystals, a pressure microtransducer, and a pneumatic cuff occluder in the descending aorta.

Main Results:

Aortic stiffening was observed.
Total wave reflection, induced by occlusion, led to a decrease in FD.
Wave reflection and aortic stiffening occurred concurrently.

Conclusions:

Arterial pressure fractality is strongly influenced by wave reflection.
Wave reflection plays a significant role in the complexity of arterial pressure signals.