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Related Concept Videos

Group Polarization01:01

Group Polarization

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.
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

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,...
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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
Encoding01:19

Encoding

Information enters the brain through encoding, which is the input of information into the memory system. Once sensory information is received from the environment, the brain labels or codes it. The information is then organized with similar information and connected to existing concepts. Encoding occurs through automatic processing and effortful processing.
Automatic processing involves the encoding of details like time, space, frequency, and the meaning of words, usually done without conscious...

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Related Experiment Video

Updated: Jun 12, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Outer product processor using polarization encoding.

A P Ittycheriah, J F Walkup, T F Krile

    Applied Optics
    |June 18, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This paper introduces a novel optical architecture for parallel processing, enhancing spatial capacity fourfold using polarization encoding. This design enables efficient evaluation of quadratic functions, primarily for quadratic neural networks.

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    Area of Science:

    • Optical engineering
    • Computer architecture
    • Artificial intelligence

    Background:

    • Traditional architectures face limitations in parallel processing and spatial capacity.
    • Evaluating complex functions like second-order polynomials requires specialized hardware.

    Purpose of the Study:

    • To present a novel optical architecture for outer product operations and element weighting.
    • To enhance spatial capacity and computational versatility for applications like quadratic neural networks.

    Main Methods:

    • Utilizing a polarization encoding technique to increase spatial capacity.
    • Employing space-integrating photodiodes for evaluating second-order polynomials.
    • Implementing spatial multiplexing for parallel operations.

    Main Results:

    • Achieved a fourfold increase in spatial capacity compared to other techniques.
    • Demonstrated the capability to evaluate second-order polynomials.
    • Enabled versatile parallel processing for complex computations.

    Conclusions:

    • The proposed architecture offers significant advantages in spatial capacity and parallel processing.
    • It is well-suited for implementing advanced computational models such as quadratic neural networks.