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Related Concept Videos

Pulse01:16

Pulse

2.0K
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...
2.0K
Pulse01:05

Pulse

3.5K
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...
3.5K
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

1.7K
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.
1.7K
Pulse Oximetry01:24

Pulse Oximetry

1.3K
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...
1.3K
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 27, 2026

Non-invasive 3D-Visualization with Sub-micron Resolution Using Synchrotron-X-ray-tomography
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Non-invasive 3D-Visualization with Sub-micron Resolution Using Synchrotron-X-ray-tomography

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Pulse picking in synchrotron-based XPEEM.

Lucia Aballe1, Michael Foerster1, Meritxell Cabrejo1

  • 1ALBA Synchrotron, Carrer de la llum 2-26, 08290 Cerdanyola del Valles, Spain.

Ultramicroscopy
|April 1, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed a cost-effective, high-speed gating device for photoemission electron microscopy (PEEM). This innovation enables stroboscopic data collection with sub-10 ns on-time, advancing pump-probe imaging capabilities.

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Area of Science:

  • Physics
  • Materials Science
  • Microscopy

Background:

  • Photoemission Electron Microscopy (PEEM) is a powerful surface imaging technique.
  • Pulsed photon sources require precise timing for advanced applications.
  • Existing gating methods can be complex or costly.

Purpose of the Study:

  • To develop a simple, cost-effective, high-speed gating device for PEEM.
  • To enable stroboscopic data collection with pulsed photon sources.
  • To enhance PEEM capabilities for time-resolved studies.

Main Methods:

  • A compact device with miniaturized electrode plates was designed.
  • The device deflects the photoelectron beam for selective detection.
  • It is optimized for the Elmitec SPELEEM III microscope and driven by low-amplitude voltage pulses.

Main Results:

  • The gating device achieves an on-time of less than 10 nanoseconds.
  • It operates at repetition rates from 1 MHz to 250 MHz.
  • Successful demonstration of pump-probe imaging for magnetic domains and surface acoustic waves.

Conclusions:

  • The developed gating device offers a cost-effective solution for high-speed PEEM.
  • It facilitates stroboscopic data acquisition, crucial for time-resolved experiments.
  • This technology opens new avenues for high-resolution pump-probe studies in surface science.