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Related Concept Videos

Impulse Response01:17

Impulse Response

761
The impulse response is the system's reaction to an input impulse. In an RC circuit, the voltage source is the input, and the capacitor's voltage is the output. The system's state and output response before and after input excitation are distinctly defined.
Kirchhoff's law forms an input signal equation, with the capacitor's current and voltage providing the output. Substituting the current and dividing by RC yields a differential equation. The output for an impulse input is the impulse...
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Impulse01:13

Impulse

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According to Newton’s second law of motion, the rate of change of the momentum of an object is the net external force acting on it. The total change in momentum between two timepoints thus depends on both the external force acting on it and the time over which it acts. Describing this mathematically, the total change of an object’s motion is proportional to the force vector and the time over which it is applied. This product is called impulse.
Additionally, it can be shown that the...
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Ion Channels01:19

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The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
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Principle of Impulse and Moment01:15

Principle of Impulse and Moment

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When one considers a rigid body undergoing a plane motion, which is essentially a blend of translational and rotational movement, the application of Newton's second law gives the formula for the translational movement of such a body. If this equation is multiplied by a time interval, dt, and then integrated over the limits of integration, it results in an equation that embodies the principle of linear impulse.
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Impulse-Momentum Theorem00:49

Impulse-Momentum Theorem

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The total change in the motion of an object is proportional to the total force vector acting on it and the time over which it acts. This product is called impulse, a vector quantity with the same direction as the total force acting on the object.
By writing Newton's second law of motion in terms of the momentum of an object and the external force acting on it, and simultaneously using the definition of the impulse vector, it can be shown that the total impulse on an object is equal to its...
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Principle of Angular Impulse and Momentum: Problem Solving01:19

Principle of Angular Impulse and Momentum: Problem Solving

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Consider a ball of mass m, attached to a massless rod of known length, subjected to a time-dependent torque. If the initial velocity of the mass is known, then the final velocity of the mass for time t can be determined using the principle of angular impulse and momentum.
Initially, a free-body diagram of the system is drawn to illustrate all the forces acting upon the system, providing a crucial understanding of the dynamics at play. Then, the principle of angular impulse and momentum is...
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Impulse response modeling for underwater optical wireless channels.

Yiming Li, Mark S Leeson, Xiaofeng Li

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    |August 18, 2018
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    Summary
    This summary is machine-generated.

    A new impulse response model improves underwater optical wireless communication (UOWC) channel analysis. This novel function offers superior accuracy for modeling UOWC channel behavior and performance evaluation.

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    Area of Science:

    • Optical Wireless Communication
    • Signal Processing
    • Channel Modeling

    Background:

    • Impulse response is crucial for characterizing temporal dispersion in underwater optical wireless communication (UOWC) channels.
    • Existing models, like the weighted double gamma functions (WDGF), may not fully capture the complexities of realistic UOWC environments.

    Purpose of the Study:

    • To propose a novel, more accurate function for modeling impulse response in UOWC channels.
    • To demonstrate the superiority of the new model over conventional methods for realistic UOWC scenarios.

    Main Methods:

    • Development of a new impulse response modeling function based on UOWC channel properties.
    • Utilizing Monte Carlo simulations to validate the numerical fitting accuracy of the proposed model.

    Main Results:

    • The newly proposed model exhibits superior performance compared to the conventional WDGF model in fitting UOWC channel behavior.
    • Monte Carlo simulations confirm the enhanced numerical fitting accuracy of the new model in most realistic cases.

    Conclusions:

    • The proposed impulse response model provides a more accurate and convenient approach for UOWC channel analysis.
    • This advancement facilitates better performance evaluation for various UOWC systems.