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Capacitors and Capacitance01:18

Capacitors and Capacitance

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A device consisting of two electrical conductors that are separated by a distance and used to store electrical charges is called a capacitor. The space between the conductors is either a vacuum or an insulating material, called a dielectric. Capacitors have many applications, ranging from filtering static from radio reception to energy storage in heart defibrillators.
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Multiple capacitors can be connected in a circuit in series or parallel configuration. When the capacitor combination is connected to a battery, the potential drop across each capacitor and the magnitude of charge stored in the individual capacitor depends on the type of the connection. The capacitor combination is replaced by a single equivalent capacitor that stores the same amount of charge as the combination for a given potential difference.
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From the study of resistive circuits, it is understood that employing a series-parallel combination serves as an effective strategy for simplifying circuits. Capacitors can be arranged within a circuit in one of two ways: a series configuration or a parallel configuration. The way these capacitors are connected to a battery will influence both the potential drop across each individual capacitor and the size of the charge that each capacitor can store. This is determined by the specific type of...
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The Sense of Self: Reflected Self-Appraisal and Social Comparison02:57

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According to Charles Cooley, we base our image on what we think other people see (Cooley 1902). We imagine how we must appear to others, then react to this speculation. We don certain clothes, prepare our hair in a particular manner, wear makeup, use cologne, and the like—all with the notion that our presentation of ourselves is going to affect how others perceive us. We expect a certain reaction, and, if lucky, we get the one we desire and feel good about it. But more than that, Cooley...
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In electrical power systems, understanding the capacitance of transmission lines is fundamental for efficient operation.
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In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
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Multidimensional Capacitive Sensing for Robot-Assisted Dressing and Bathing.

Zackory Erickson, Henry M Clever, Vamsee Gangaram

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    Summary
    This summary is machine-generated.

    Robots can now sense and track human limbs through clothing using a novel capacitive sensing technique. This breakthrough enables robots to assist with daily tasks like dressing and bathing for individuals with physical disabilities.

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    Area of Science:

    • Robotics
    • Human-Robot Interaction
    • Biomedical Engineering

    Background:

    • Robotic assistance offers potential for individuals with physical disabilities.
    • Accurate human body sensing and motion tracking remain challenges for robots.
    • Existing sensing methods struggle with opaque materials like clothing.

    Purpose of the Study:

    • To introduce a multidimensional capacitive sensing technique for real-time human limb pose estimation.
    • To enable robots to sense limbs through opaque materials for assistive tasks.
    • To demonstrate the application of this sensing method in daily living activities.

    Main Methods:

    • A multielectrode capacitive sensor is mounted on a robot's end effector.
    • A neural network model estimates limb position and orientation relative to the sensor.
    • The system uses pose estimates for feedback control, allowing the robot to interact with the limb.

    Main Results:

    • The technique successfully senses human limbs through opaque materials, including wet cloth.
    • A PR2 robot utilized the capacitive sensor to assist with dressing and bathing tasks.
    • The robot accurately tracked human motion and adapted its end effector movements during assistance.

    Conclusions:

    • Multidimensional capacitive sensing is a promising approach for robots to perceive and track the human body.
    • This technology can enhance robots' capabilities in physical human-robot interaction for assistive applications.
    • The method facilitates robots in performing complex tasks requiring close physical contact and precise movement.