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Related Concept Videos

Pulse01:16

Pulse

2.2K
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...
2.2K
Pulse01:05

Pulse

4.2K
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...
4.2K
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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Light-driven Enzymatic Decarboxylation
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Light-driven Enzymatic Decarboxylation

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Electron Dynamics Driven by Light-Pulse Derivatives.

Qi-Cheng Ning1, Ulf Saalmann1, Jan M Rost1

  • 1Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Straße 38, 01187 Dresden, Germany.

Physical Review Letters
|February 6, 2018
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Summary
This summary is machine-generated.

Ultrashort laser pulses enable a new light-matter interaction regime. The pulse

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Area of Science:

  • Attosecond physics
  • Quantum optics
  • Strong field physics

Background:

  • Standard photoionization models often assume adiabatic electron response.
  • Ultrashort laser pulses introduce complex light-matter interactions.
  • The envelope derivative of light pulses can play a crucial role.

Purpose of the Study:

  • To explore a new regime of light-matter interaction driven by the envelope derivative of ultrashort pulses.
  • To understand nonadiabatic electron dynamics influenced by the pulse shape.
  • To investigate the behavior of ionization bursts in this novel regime.

Main Methods:

  • Utilized a time-dependent close-coupling approach.
  • Employed cycle-averaged potentials within the Kramers-Henneberger reference frame.
  • Simulated electron dynamics driven by the light pulse envelope derivative.

Main Results:

  • Demonstrated that ultrashort pulses can mimic double pulses through their derivative.
  • Observed two distinct nonadiabatic ionization bursts with slightly different amplitudes.
  • Identified energy redistribution of continuum electrons as the cause for amplitude differences.

Conclusions:

  • Ultrashort pulse envelopes can drive novel nonadiabatic electron dynamics.
  • The derivative of the light pulse envelope is critical for this new interaction regime.
  • This work provides a detailed understanding of light-pulse derivative-driven electron dynamics.