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Time and frequency -Domain Interpretation of Phase-lead Control01:24

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Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
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The Delta-to-Y Circuit01:16

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In the delta-wye circuit, the source is delta-connected, while the load is in a wye configuration. This means that the phase voltage of the delta-connected source is equal to the line voltage of the wye-connected load. The connection between two-line currents originates from the delta-connected source. The phase difference in the balanced system allows for calculating one line current given the other, utilizing the positive sequence of phases. In the delta-wye system, the phase currents in the...
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In a balanced four-wire wye-to-wye system, the arrangement involves wye-connected sinusoidal voltage sources and loads, connected through a neutral wire that links the neutral nodes of the source and load. The load impedance is connected across each phase of the load. The wye-connected source can be connected to the wye-connected load in four-wire and three-wire arrangements. A three-phase system is considered balanced when the load on each phase is equal, leading to uniform current flow and...
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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Chaotic encryption scheme for physical layer security in twin-SSB system via phase ambiguity.

Zhanjiang Wang, Jianguo Yu, Kaile Li

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    This study introduces a novel physical layer encryption method using digital chaos in optical communication systems. The technique enhances security for twin-SSB signals, achieving high capacity and resistance to attacks for future secure networks.

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    Area of Science:

    • Optical Communications
    • Physical Layer Security
    • Chaos Engineering

    Background:

    • Traditional encryption methods face challenges in high-speed optical networks.
    • Need for robust physical layer security to prevent signal interception.

    Purpose of the Study:

    • To propose a novel physical layer encryption method for optical twin-SSB signals.
    • To integrate digital chaos and phase ambiguity for enhanced security.
    • To demonstrate secure transmission of a complex modulated signal.

    Main Methods:

    • Utilizing digital chaos via phase ambiguity in a twin-SSB signal single-photodiode detection system.
    • Implementing bit-level XOR encryption and chaotic sequence generation.
    • Synthesizing a multiple-sideband-superposed 64-ary quadrature amplitude modulation (MSBS-64QAM) signal from GS-QPSK and GS-16QAM components.

    Main Results:

    • Achieved stable transmission of encrypted MSBS-64QAM over 10-km standard single-mode fiber.
    • Bit error rates (BER) met hard-decision forward error correction (HD-FEC) thresholds.
    • Demonstrated a key space magnitude of 10^90, offering strong resistance to brute-force attacks.

    Conclusions:

    • The proposed digital chaos-based encryption method provides dual-security protection for optical signals.
    • The scheme shows significant potential for short-reach, high-capacity secure communication systems.
    • Successful integration of chaos theory into optical communication security is demonstrated.