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Related Concept Videos

Pulse01:16

Pulse

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When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level.
The pulse serves as a clinical...
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Pulse01:05

Pulse

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The pulse is one of the most fundamental physiological indicators of the body's cardiovascular health. It is the rhythmic expansion and contraction of the arterial walls in response to the pressure generated by the heart's pumping action.
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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Pulse Oximetry01:24

Pulse Oximetry

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Pulse oximetry, or SpO2, is a non-invasive method for continuously monitoring arterial oxygen saturation (SaO2). This procedure involves attaching a probe or sensor to the patient's fingertip, forehead, earlobe, or nose bridge. The sensor works by detecting changes in oxygen saturation levels through light signals generated by the oximeter and reflected by the pulsing blood under the probe.
Purpose
Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...
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Regulation of Pulse01:20

Regulation of Pulse

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Pulse regulation involves physiological mechanisms that ensure adequate blood flow throughout the body. The heartbeat, regulated by the autonomic nervous system, is influenced by hormonal balance, physical activity, and emotional state.
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Pulse rhythm01:30

Pulse rhythm

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Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
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Production of Metal Nanoparticles by Pulsed Laser-ablation in Liquids: A Tool for Studying the Antibacterial Properties of Nanoparticles
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Millimetric granular craters from pulsed laser ablation.

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  • 1Department of Chemical Engineering, Texas Tech University, Lubbock, Texas 79409, USA.

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This study explores granular crater formation using laser-induced optical energy, offering new insights into non-contact cratering mechanisms. Researchers observed energy scaling laws for millimetric craters, revealing relationships between crater size and laser energy.

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Area of Science:

  • Physics
  • Materials Science
  • Geophysics

Background:

  • Granular cratering is typically studied through impact or explosion events.
  • Understanding crater formation mechanisms is crucial for various scientific and engineering applications.
  • Non-contact methods for crater initiation are less explored, particularly at small scales.

Purpose of the Study:

  • To experimentally investigate granular crater formation induced by optical energy from a pulsed laser.
  • To analyze energy scaling laws for laser-induced granular craters.
  • To explore cratering dynamics at millimetric scales without physical contact.

Main Methods:

  • A pulsed laser was focused onto the surface of a granular bed to create craters.
  • Experimental parameters included varying laser energy and granular media characteristics.
  • Crater dimensions were measured to determine scaling relationships.

Main Results:

  • Granular craters were successfully formed using a non-contact optical energy mechanism.
  • A power-law relationship between crater diameter (D_c) and laser energy (E) was observed: D_c ~ E^β.
  • The exponent β ranged from approximately 0.31 to 0.43, depending on granular media properties.

Conclusions:

  • Optical energy provides a novel, non-contact method for granular crater formation.
  • The study demonstrates energy scaling laws applicable to laser-induced granular craters at millimetric scales.
  • Findings contribute to a fundamental understanding of granular dynamics and energy transfer in cratering processes.