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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

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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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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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Cruise control systems in cars are designed as multi-input systems to maintain a driver's desired speed while compensating for external disturbances such as changes in terrain. The block diagram for a cruise control system typically includes two main inputs: the desired speed set by the driver and any external disturbances, such as the incline of the road. By adjusting the engine throttle, the system maintains the vehicle's speed as close to the desired value as possible.
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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.
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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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Related Experiment Video

Updated: Feb 9, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

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Coherent multi-heterodyne spectroscopy using acousto-optic frequency combs.

Vicente Durán, Cȏme Schnébelin, Hugues Guillet de Chatellus

    Optics Express
    |June 8, 2018
    PubMed
    Summary
    This summary is machine-generated.

    We developed a novel optical frequency comb source using acousto-optic modulators for advanced multi-heterodyne spectrometry. This technique generates over 1500 coherent lines for high-resolution molecular spectroscopy.

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    Area of Science:

    • Photonics and Spectroscopy
    • Laser Physics
    • Quantum Optics

    Background:

    • Optical frequency combs are crucial for high-precision measurements.
    • Existing comb generation methods often rely on complex setups or nonlinear processes.
    • A need exists for reconfigurable and robust frequency comb sources.

    Purpose of the Study:

    • To introduce and experimentally validate a new acousto-optic frequency comb source.
    • To demonstrate its application in multi-heterodyne spectrometry and molecular spectroscopy.
    • To showcase the comb's reconfigurability and high performance.

    Main Methods:

    • A frequency-shifting loop seeded by a continuous-wave laser was employed.
    • Acousto-optic frequency shifters generated multiple coherent comb lines.
    • The system was configured for self-heterodyne interferometry and dual-comb spectroscopy.
    • Spectroscopic measurements of hydrogen cyanide were performed.

    Main Results:

    • Generated frequency combs with over 1500 mutually coherent lines.
    • Achieved reconfigurable line spacing from kHz to MHz.
    • Demonstrated high-frequency resolution (500 kHz) self-heterodyne interferometry.
    • Performed sub-millisecond timescale molecular spectroscopy.
    • Validated the technique with near-infrared spectroscopy of hydrogen cyanide.

    Conclusions:

    • The acousto-optic frequency comb is a versatile and powerful tool for multi-heterodyne spectrometry.
    • This method offers a robust alternative to existing comb generation techniques.
    • The demonstrated spectroscopy capabilities highlight its potential for various scientific applications.