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Related Concept Videos

Frequency-dependent Selection01:21

Frequency-dependent Selection

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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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What is a Frequency Distribution00:51

What is a Frequency Distribution

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A frequency is the number of times a value of the data occurs. The sum of all the frequency values represents the total number of students included in the sample. It is commonly used to group data of quantitative types. Frequency distributions can be displayed in a table, histogram, line graph, dot plot, or pie chart, just to name a few. A histogram is a graphical representation of tabulated frequencies, shown as adjacent rectangles, erected over discrete intervals (bins), with an area equal to...
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Mean From a Frequency Distribution01:11

Mean From a Frequency Distribution

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Sometimes, data gathered from an experiment on a large sample or population are organized into concise tables. In such cases, the frequency of the quantitative data set is plotted in the form of a table. Or else, the data values are grouped into the quantity’s intervals, which form classes, and their respective frequencies are known. That is, the data values are distributed over different categories or classes. This is known as frequency distribution.
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Muscle Stimulation Frequency01:22

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The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
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Frequency Response of BJT01:24

Frequency Response of BJT

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The frequency response of a Bipolar Junction Transistor (BJT) in a common-emitter configuration is critical to its functionality, especially in applications involving amplification of alternating current (AC) signals. This response can be analyzed through low-frequency and high-frequency equivalent circuits, considering various internal parameters and external conditions.
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Load-frequency control01:28

Load-frequency control

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Load-frequency control (LFC) is vital for maintaining power system stability, ensuring that frequency and power flows remain within acceptable limits during load changes. Turbine-governor control eliminates rotor accelerations and decelerations following load changes. However, a steady-state frequency error persists when the change in the turbine-governor reference setting is zero. In an interconnected power system, each area agrees to export or import a scheduled amount of power through...
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Related Experiment Video

Updated: Feb 6, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Free-space-based multiple-access frequency dissemination with optical frequency comb.

Dong Hou, Danian Zhang, Fuyu Sun

    Optics Express
    |August 17, 2018
    PubMed
    Summary
    This summary is machine-generated.

    We show a new method for stable frequency transfer over free space using an optical frequency comb. This technique achieves high precision, enabling reliable signal dissemination at any point in a free-space link.

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    Area of Science:

    • Optics
    • Metrology
    • Quantum Information Science

    Background:

    • Accurate frequency dissemination is crucial for scientific and technological advancements.
    • Free-space optical links offer flexible alternatives to fiber-based systems but face challenges with signal stability.

    Purpose of the Study:

    • To demonstrate a robust free-space frequency dissemination system using an optical frequency comb.
    • To evaluate the performance of a passive phase conjunction correction technique for mitigating timing fluctuations.

    Main Methods:

    • Utilized an optical frequency comb for generating a stable optical carrier.
    • Employed a passive phase conjunction correction technique to compensate for environmental disturbances.
    • Measured timing fluctuations and Allan Deviations to quantify frequency instability.

    Main Results:

    • Successfully reproduced a 2 GHz radio-frequency signal over a 60-m free-space link.
    • Achieved a total root-mean-square (RMS) timing fluctuation of approximately 224 fs.
    • Demonstrated fractional frequency instability of 8 × 10-14 at 1 s and 1 × 10-16 at 1000 s.

    Conclusions:

    • The developed free-space frequency dissemination system offers high precision and stability.
    • Passive phase conjunction correction effectively reduces timing fluctuations in free-space links.
    • This technology enables reliable dissemination of stable frequency signals to arbitrary locations in free space.