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Related Concept Videos

Masking and Demasking Agents01:19

Masking and Demasking Agents

3.7K
EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on...
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Crown Ethers02:36

Crown Ethers

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Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether molecules...
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Protecting Groups for Aldehydes and Ketones: Introduction01:23

Protecting Groups for Aldehydes and Ketones: Introduction

9.2K
Protecting groups are compounds that can bind to a specific functional group in the presence of other functional groups to protect them from undesired chemical reactions. These compounds can selectively bind to particular functional groups and advance chemoselective reactions in polyfunctional systems (Figure 1). After the functional group has served its purpose, it is removed by reacting it with specific compounds.
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Protection of Alcohols02:31

Protection of Alcohols

8.1K
This lesson delves into the concept of protection and deprotection of a functional group fundamental to synthetic organic chemistry. These phenomena are explained in the context of aliphatic and aromatic alcohols.
Protection
It defines a protecting group as the masking agent to make the more reactive species inert to a given set of conditions. This concept is depicted via the illustration of liquid flow through different outlets in an assembly of pipes. The analogy helps to understand the role...
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Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Related Experiment Video

Updated: Feb 21, 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

9.0K

High-security floating probabilistic encryption methods based on chain-embedded masking.

Haisu Qian, Bo Liu, Jianxin Ren

    Optics Express
    |February 20, 2026
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel encryption method for optical networks using a unique constellation design. The Hierarchical Triangular-Distorted Hexagonal (HTDH) 16QAM constellation enhances transmission security and receiver sensitivity.

    Related Experiment Videos

    Last Updated: Feb 21, 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

    9.0K

    Area of Science:

    • Optical communication networks
    • Information security
    • Signal processing

    Background:

    • Increasing demands for transmission performance and security in optical access networks.
    • Need for advanced encryption methods to protect data integrity and confidentiality.
    • Limitations of conventional modulation schemes in balancing performance and security.

    Purpose of the Study:

    • To propose a high-security floating probabilistic encryption method based on chain-embedded masking for optical access networks.
    • To design a novel constellation structure that reduces transmission power and enhances security.
    • To investigate the co-optimization of transmission security and system sensitivity.

    Main Methods:

    • Development of a chain-embedded masking technique with a Hierarchical Triangular-Distorted Hexagonal (HTDH) constellation.
    • Utilizing a Lorenz chaotic model for dynamic perturbation of constellation points.
    • Experimental validation on a seven-core fiber transmission system.

    Main Results:

    • The HTDH 16 Quadrature Amplitude Modulation (16QAM) constellation achieved a 0.48 dB improvement in receiver sensitivity compared to conventional 16QAM at a bit error rate of 3.8 × 10⁻³.
    • Encrypted signals showed an additional 0.33 dB sensitivity enhancement over unencrypted signals.
    • The proposed method achieved a constellation figure of merit (CFM) value of 0.444.

    Conclusions:

    • The proposed encryption method effectively enhances transmission security in optical networks.
    • The HTDH constellation design synergizes with the encryption mechanism to improve receiver sensitivity.
    • The study demonstrates a co-optimization of transmission security and system sensitivity through innovative modulation and encryption.