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Related Concept Videos

Free-falling Bodies: Example01:05

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An object falling without any air resistance under the influence of gravitational force is said to be in free-fall. For free-falling bodies, the acceleration due to gravity is constant, irrespective of their mass. Free-fall is experienced not only by objects falling downward, but also by all objects whose motion is influenced by gravitational force alone. The dynamics of free-fall motion can be calculated using kinematic equations of motion, since free-fall acceleration is constant.
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False memories represent a cognitive distortion in which individuals recall events that did not happen, or remember them in an altered form. This phenomenon highlights the brain's constructive nature in processing and recalling memories, emphasizing that memory is not a perfect representation of past events but rather a dynamic reconstruction influenced by various factors.
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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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All objects, neglecting air resistance, fall with the same acceleration towards the Earth's center due to the force exerted by the Earth's gravity. This experimentally determined fact is unexpected because we are so accustomed to the effects of air resistance and friction that we expect light objects to fall slower than heavier ones. People believed that a heavier object had a greater acceleration when falling until Galileo Galilei (1564–1642) proved otherwise. We now know this is...
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The rate of reaction is the change in the amount of a reactant or product per unit time. Reaction rates are therefore determined by measuring the time dependence of some property that can be related to reactant or product amounts. Rates of reactions that consume or produce gaseous substances, for example, are conveniently determined by measuring changes in volume or pressure.
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Related Experiment Video

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A Low-Power Fall Detector Balancing Sensitivity and False Alarm Rate.

Changhong Wang, Wei Lu, Stephen J Redmond

    IEEE Journal of Biomedical and Health Informatics
    |July 11, 2018
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    Summary

    This study introduces a low-power wearable fall detector for older adults. The device offers high accuracy and a long battery life, addressing key challenges for real-world use.

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    Area of Science:

    • Gerontology
    • Biomedical Engineering
    • Wearable Technology

    Background:

    • Falls in older adults represent a significant public health concern.
    • Wearable fall detectors can improve response times by automatically detecting falls.
    • Existing research often overlooks crucial metrics like false alarm rates and battery life, impacting practical usability.

    Purpose of the Study:

    • To develop a low-power wearable fall detector.
    • To optimize the device for a balance between detection accuracy, low false alarm rate, and extended battery life.
    • To enhance user compliance through improved device performance.

    Main Methods:

    • Utilized triaxial accelerometry and barometric pressure sensing for fall detection.
    • Implemented hardware- and firmware-based techniques to minimize power consumption.
    • Optimized the fall detection algorithm for sensitivity, low false alarm rate, and reduced computational power demands.

    Main Results:

    • Achieved high sensitivity of 91% in fall detection.
    • Recorded a low false alarm rate of 0.1149 alarms per hour.
    • Demonstrated a commercially viable battery life of 1125 days.

    Conclusions:

    • The proposed low-power fall detector effectively balances performance metrics crucial for user compliance.
    • This device offers a practical solution for reducing fall-related risks in older populations.
    • The optimized design addresses limitations of previous fall detection systems.