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Related Concept Videos

Pulse01:16

Pulse

2.1K
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...
2.1K
Pulse01:05

Pulse

3.6K
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.
Pulse Rate and its Significance
Pulse rate, often measured in beats per minute (bpm), reflects the heart rate (HR), which is influenced by numerous factors such as stress, physical activity, and hormonal changes. A normal resting adult pulse rate falls...
3.6K
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

1.8K
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.
1.8K
Pulse Oximetry01:24

Pulse Oximetry

1.4K
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...
1.4K
Regulation of Pulse01:20

Regulation of Pulse

2.3K
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.
2.3K
Pulse rhythm01:30

Pulse rhythm

1.4K
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.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac...
1.4K

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Related Experiment Video

Updated: Jan 29, 2026

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Analysis of terahertz generation using tilted pulse fronts.

Koustuban Ravi, Franz Kärtner

    Optics Express
    |February 9, 2019
    PubMed
    Summary

    This study analyzes terahertz generation using tilted optical pulses, detailing how distortions affect terahertz output. It provides analytical expressions for terahertz transients and spectra, crucial for optimizing generation efficiency.

    Area of Science:

    • Optics and Photonics
    • Terahertz Science

    Background:

    • Terahertz (THz) generation via optical rectification of tilted pulse fronts is a key technique.
    • Understanding spatio-temporal distortions is critical for efficient THz generation.

    Purpose of the Study:

    • To present a comprehensive spatio-temporal analysis of THz generation by optical rectification of tilted pulse fronts.
    • To derive closed-form expressions for THz transients and spectra, considering various optical pump pulse distortions.
    • To analytically reveal the impact of these distortions on THz characteristics.

    Main Methods:

    • Spatio-temporal analysis of THz generation.
    • Derivation of closed-form expressions for THz transients and spectra in the undepleted limit.
    • Incorporation of optical pump pulse distortions: angular dispersion, group velocity dispersion (GVD) due to angular dispersion, spatial and temporal chirp, and beam curvature.

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    Main Results:

    • Analytical expressions for THz transients and spectra in two spatial dimensions are provided.
    • The influence of the radius of curvature on the pulse front tilt angle is quantified.
    • The detrimental effects of GVD due to angular dispersion on THz frequency, conversion efficiency, and peak field are analytically determined, especially at large pump bandwidths and beam sizes.

    Conclusions:

    • Spatio-temporal distortions, particularly GVD due to angular dispersion, significantly impact THz generation efficiency and characteristics.
    • The derived analytical expressions offer valuable insights for optimizing THz generation processes by mitigating these distortions.
    • This work provides a theoretical framework for designing and improving THz sources based on optical rectification.