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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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Transcranial Pulse Stimulation for Alzheimer's Patients
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3D pulsed chaos lidar system.

Chih-Hao Cheng, Chih-Ying Chen, Jun-Da Chen

    Optics Express
    |May 3, 2018
    PubMed
    Summary
    This summary is machine-generated.

    We developed a novel 3D pulsed chaos lidar system for intelligent machinery. This system offers superior precision, a 100m detection range, and millimeter-level accuracy, outperforming commercial lidar technologies.

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    Area of Science:

    • Optics and Photonics
    • Robotics and Intelligent Systems
    • Signal Processing

    Background:

    • Conventional continuous-wave (CW) chaos lidars offer anti-jamming and no range ambiguity.
    • Existing lidar systems face limitations in energy utilization efficiency and detection range.

    Purpose of the Study:

    • To develop an unprecedented 3D pulsed chaos lidar system for intelligent machinery.
    • To enhance energy-utilization efficiency and detection performance.

    Main Methods:

    • Development of a 3D pulsed chaos lidar system.
    • Implementation of self-homodyning and time gating for pulsed homodyned chaos generation.
    • Integration of a 2-axis MEMS mirror for active laser scanning.

    Main Results:

    • Achieved millimeter-level accuracy and precision in ranging with a 1.25 GS/s sampling rate.
    • Demonstrated a detection SNR improvement of over 20 dB compared to original chaos.
    • Obtained a detection range up to 100 m, surpassing commercial Spectroscan and Lidar-lite.
    • Realized real-time 3D imaging with depth errors less than 4 mm.

    Conclusions:

    • The developed 3D pulsed chaos lidar system offers superior performance for intelligent machinery applications.
    • The system exhibits enhanced precision, extended detection range, and high-accuracy 3D imaging capabilities.
    • The pulsed chaos lidar complies with class-1 eye-safe regulations.