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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

3.7K
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...
3.7K
Flat Belts: Problem Solving01:28

Flat Belts: Problem Solving

819
Flat belts are crucial in many industrial applications as they help transmit power from one pulley to another. The concept of forces and moments is used to determine the maximum moment on a pulley. For instance, consider a flat belt that wraps around two pulleys, A and B, with radii of 30 cm and 10 cm, respectively. The angle between the belt and the horizontal is 20 degrees at the pulleys. As pulley B rotates clockwise and drives pulley A, tension T2 is caused at one end of the belt, while...
819
Frictional Forces on Flat Belts01:28

Frictional Forces on Flat Belts

1.4K
Flat belts are commonly used in various industrial applications for transmitting power from one pulley to another. When a flat belt is wrapped around a set of pulleys, it experiences different tensions at the driving pulley ends due to the friction between the belt and pulley surface. When the pulley moves in a counterclockwise direction, the tension T2 on the opposite side of the pulley where the belt is moving away from is higher than the tension T1 on the side where the belt is moving...
1.4K
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

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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses

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Amplification of flat laser pulse train.

A Hanuka, J K Santucci, D Edstrom

    Optics Express
    |November 25, 2018
    PubMed
    Summary
    This summary is machine-generated.

    Researchers optimized laser pulse amplification using a new model that accounts for beam shape. This resulted in a high-gain, flat pulse train ideal for accelerator applications.

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    Area of Science:

    • Laser Physics
    • Accelerator Science

    Background:

    • Diode-pumped solid-state lasers are crucial for particle accelerators.
    • Achieving uniform energy distribution in amplified laser pulse trains is challenging.

    Purpose of the Study:

    • To model and improve flattop amplification of laser pulse trains.
    • To explain and mitigate energy variations within amplified pulse trains.

    Main Methods:

    • Developed a theoretical model incorporating the transverse Gaussian beam shape.
    • Conducted experimental measurements on a diode-pumped Neodymium-doped Yttrium Lithium Fluoride (Nd:YLF) system.
    • Verified the model's predictions regarding beam shape influence on pulse train flatness.

    Main Results:

    • The model successfully explained residual energy slopes in the pulse train.
    • Experimental verification confirmed the impact of Gaussian beam profiles on pulse train flatness.
    • Achieved a single-pass amplifier gain of approximately 7.
    • Produced a flat output pulse train for up to 1000 infrared seed pulses.

    Conclusions:

    • The developed model accurately describes flattop amplification in Nd:YLF systems.
    • Incorporating beam shape effects significantly enhances laser amplifier performance.
    • The improved system is suitable for generating high-gain, uniform pulse trains for accelerator applications.