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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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Raman Spectroscopy: Overview01:20

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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Behavior of Concrete Under Compressive Load01:23

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Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
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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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Mean From a Frequency Distribution01:11

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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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Raman Spectroscopy Instrumentation: Overview01:26

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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Real-Time, Two-Color Stimulated Raman Scattering Imaging of Mouse Brain for Tissue Diagnosis
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Compressive Raman imaging with spatial frequency modulated illumination.

Camille Scotté, Siddharth Sivankutty, Patrick Stockton

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    A novel compressive Raman imaging technique uses modulated light and a single detector to rapidly identify chemicals. This technology achieves 40 Hz line scan rates for efficient chemical species classification.

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    Area of Science:

    • Spectroscopy
    • Chemical Imaging
    • Optical Technology

    Background:

    • Raman spectroscopy provides chemical information but is often limited by speed.
    • Traditional imaging methods can be slow and complex.
    • Developing faster, more efficient chemical identification techniques is crucial.

    Purpose of the Study:

    • To introduce a new line scanning imaging modality based on compressive Raman technology.
    • To demonstrate the capability of this modality for chemical species imaging and classification.
    • To achieve high-speed data acquisition for chemical analysis.

    Main Methods:

    • Utilized compressive Raman technology with spatial frequency modulated illumination.
    • Employed a single-pixel detector for data acquisition.
    • Implemented a line scanning approach for image construction.

    Main Results:

    • Successfully demonstrated imaging of chemical species.
    • Achieved classification of three distinct chemical species.
    • Reached line scan rates of 40 Hz, indicating high-speed performance.
    • Validated the effectiveness of spatial frequency modulation in compressive Raman imaging.

    Conclusions:

    • The developed line scanning compressive Raman modality offers a promising approach for rapid chemical identification.
    • The system's high speed (40 Hz) enables real-time or near-real-time chemical analysis.
    • This technology has potential applications in various fields requiring fast chemical detection and classification.