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Related Concept Videos

Group Polarization01:01

Group Polarization

34.9K
Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition.
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Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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Photochemical Electrocyclic Reactions: Stereochemistry01:26

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Measuring Reaction Rates03:09

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Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical...
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Cell Polarization by Rho Proteins01:21

Cell Polarization by Rho Proteins

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Cell polarity is the asymmetric distribution of cellular and membrane components, making one side of the cell different from the other. This polarity is essential to many processes such as embryogenesis, axon migration, glucose transport across epithelial cells, and directional cell migration. A migrating cell responds to intracellular or extracellular signals via molecular cascades that reorganize the actin cytoskeleton to establish this polarity. In these cells, the Rho family proteins Cdc42,...
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Related Experiment Video

Updated: Aug 23, 2025

Author Spotlight: Non-Invasive Imaging of Complex Bio-Structures Using Polarization-Sensitive Two-Photon Microscopy
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Author Spotlight: Non-Invasive Imaging of Complex Bio-Structures Using Polarization-Sensitive Two-Photon Microscopy

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Image-based polarization detection and material recognition.

Yi-Hsin Lin, Hao-Hsin Huang, Yu-Jen Wang

    Optics Express
    |October 27, 2022
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a fast, image-based polarization detection system for identifying materials. The technology enhances material recognition capabilities, potentially improving safety in Advanced Driver Assistance Systems.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Computer Vision

    Background:

    • Material recognition is crucial for autonomous systems.
    • Polarization imaging offers unique material contrast.
    • Existing methods can be slow or complex.

    Purpose of the Study:

    • To develop a single-shot, image-based polarization detection system.
    • To enable rapid material recognition using polarization properties.
    • To assess the system's applicability in Advanced Driver Assistance Systems (ADAS).

    Main Methods:

    • Utilized 4 electrically tunable liquid crystal wave plates, 4 polarizers, and 4 camera modules for Stokes parameter measurement.
    • Implemented a single-shot measurement technique for efficiency.
    • Conducted experiments using metallic and glass substrates for validation.

    Main Results:

    • Successfully demonstrated single-shot, image-based polarization detection.
    • Achieved material recognition using the developed system.
    • Validated the system's performance on different material types.

    Conclusions:

    • The developed system provides a practical approach for image-based polarization detection.
    • This technology has potential applications in material recognition for ADAS.
    • Enhanced material recognition can contribute to improved driving safety.