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Related Concept Videos

Korotkoff Sounds01:12

Korotkoff Sounds

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Korotkoff sounds are the specific sounds heard while measuring blood pressure using a sphygmomanometer, typically with a stethoscope or a Doppler device. They are named after Russian physician Nikolai Korotkov, who first described them in 1905. These sounds correspond to turbulent blood flow in the artery as the blood pressure cuff is gradually released after inflation.
During blood pressure assessment, inflating the cuff 30 millimeters of mercury above the patient's systolic blood pressure...
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Heart Sounds01:15

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Heart sounds are generated by the turbulence in blood flow due to the closing of heart valves. These sounds are best perceived slightly away from the valves, where the blood flow disseminates the sound.
Auscultation is the process of listening to these internal body sounds using a stethoscope. The heart produces four types of sounds, but only two—S1 and S2—can usually be heard with a stethoscope.
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Soundness of Cement01:17

Soundness of Cement

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The soundness of cement refers to the ability of cement paste to retain its volume after setting. Unsound cement can lead to expansion and structural damage due to the presence of free lime, magnesia, and calcium sulfate. Free lime hydrates very slowly, expanding and causing unsoundness, which is difficult to detect because it intercrystallizes with other compounds. Magnesia also reacts with water, forming crystals that can disrupt the cement's structure. Calcium sulfate can create...
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Sound Waves01:01

Sound Waves

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Sound waves can be thought of as fluctuations in the pressure of a medium through which they propagate. Since the pressure also makes the medium's particles vibrate along its direction of motion, the waves can be modeled as the displacement of the medium's particles from their mean position.
Sound waves are longitudinal in most fluids because fluids cannot sustain any lateral pressure. In solids, however, shear forces help in propagating the disturbance in the lateral direction as well....
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Sound Intensity00:58

Sound Intensity

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The loudness of a sound source is related to how energetically the source is vibrating, consequently making the molecules of the propagation medium vibrate. To measure the loudness of a source, the physical quantity of interest is the intensity. This is defined as the energy emitted per unit of time per unit of area perpendicular to the sound wave's propagation direction. Since the total energy is greater if the source vibrates for a longer duration and over a larger area, dividing the...
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Speed of Sound in Gases01:08

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The speed of sound in a gaseous medium depends on various factors. Since gases constitute molecules that are free to move, they are highly compressible. Hence, sound waves travel slowly through gases. Thermodynamics helps us understand the relationship between pressure, volume, and temperature of gases, thus, the speed of sound in an ideal gas can be determined using the laws of thermodynamics. At the same time, Newton's laws of motion and the continuity equation of fluid dynamics also come...
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Related Experiment Video

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Extraction of the EPP Component from the Surface EMG
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Extraction of the EPP Component from the Surface EMG

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Recording EMG Signals on a Computer Sound Card.

Kevin M Crisp1

  • 1Biology Department, St. Olaf College, Northfield, MN 55057.

Journal of Undergraduate Neuroscience Education : JUNE : a Publication of FUN, Faculty for Undergraduate Neuroscience
|September 27, 2018
PubMed
Summary
This summary is machine-generated.

A low-cost circuit enables portable electromyography (EMG) recording using a laptop and sound card. This accessible setup enhances undergraduate experimental skills and innovation in data acquisition.

Keywords:
lab activityneurosciencenoise eliminationsignal analysisundergraduate

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Educational Technology

Background:

  • Electromyography (EMG) signal acquisition typically requires specialized and expensive equipment.
  • Portable and cost-effective solutions are needed for widespread use in research and education.
  • Undergraduate training in experimental techniques can be limited by resource constraints.

Purpose of the Study:

  • To develop an inexpensive, portable data acquisition system for recording EMG signals.
  • To utilize common consumer electronics like sound cards and laptops for EMG data collection.
  • To provide undergraduates with hands-on experience in experimental design and data analysis.

Main Methods:

  • A simple audio amplifier circuit was constructed using readily available integrated circuits.
  • The circuit amplifies EMG signals from surface electrodes and matches impedance for sound card input.
  • Open-source sound editing software was used for data recording, and Python code for analysis.

Main Results:

  • A functional and affordable portable EMG data acquisition system was successfully built.
  • The system effectively recorded EMG signals using a laptop's external sound card.
  • The setup allowed for offline data analysis using Python, demonstrating its practical utility.

Conclusions:

  • This low-cost system democratizes EMG data acquisition, making it accessible for educational and research purposes.
  • The project fosters innovation and confidence in undergraduate students through practical experimental work.
  • The integration of consumer electronics with scientific instrumentation offers a scalable model for portable bio-signal recording.