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相关概念视频

Hybridization of Atomic Orbitals II03:35

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sp3d and sp3d 2 Hybridization
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Hybridization of Atomic Orbitals I03:24

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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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One-Degree-of-Freedom System01:24

One-Degree-of-Freedom System

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In mechanical engineering, one-degree-of-freedom systems form the basis of a wide range of electrical and mechanical components. Using these models, engineers can predict the behavior of various parts in a larger system, which gives them insight into how different forces interact with each other.
A one-degree-of-freedom system is defined by an independent variable that determines its state and behavior. One example of a one-degree-of-freedom system is a simple harmonic oscillator, such as a...
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Multi-input and Multi-variable systems01:22

Multi-input and Multi-variable systems

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Cruise control systems in cars are designed as multi-input systems to maintain a driver's desired speed while compensating for external disturbances such as changes in terrain. The block diagram for a cruise control system typically includes two main inputs: the desired speed set by the driver and any external disturbances, such as the incline of the road. By adjusting the engine throttle, the system maintains the vehicle's speed as close to the desired value as possible.
In the absence...
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Routh-Hurwitz Criterion I01:15

Routh-Hurwitz Criterion I

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Consider an electrical power grid, where stability is essential to prevent blackouts. The Routh-Hurwitz criterion is a valuable tool for assessing system stability under varying load conditions or faults. By analyzing the closed-loop transfer function, the Routh-Hurwitz criterion helps determine whether the system remains stable.
To apply the Routh-Hurwitz criterion, a Routh table is constructed. The table's rows are labeled with powers of the complex frequency variable s, starting from the...
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Cartesian Vector Notation01:28

Cartesian Vector Notation

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Cartesian vector notation is a valuable tool in mechanical engineering for representing vectors in three-dimensional space, performing vector operations such as determining the gradient, divergence, and curl, and expressing physical quantities such as the displacement, velocity, acceleration, and force. By using Cartesian vector notation, engineers can more easily analyze and solve problems in various areas of mechanical engineering, including dynamics, kinematics, and fluid mechanics. This...
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相关实验视频

Updated: Jun 16, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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基于五维哈密尔顿保守混沌系统的多键混合加密光学代码书.

Wei Zhang, Nana Yu, Xiangxiang Ji

    Optics express
    |June 14, 2025
    PubMed
    概括

    一个新的计算全息光学代码书,利用五维哈密尔顿保守混沌系统 (FHCCS),增强了对大数据挑战的安全性和能力. 这种方法提供了强大的抵抗野蛮武力攻击,证明适用于现代加密需求的实用性.

    科学领域:

    • 光学和信息安全 信息安全
    • 计算式全息学 计算式全息学
    • 混沌理论 混沌理论

    背景情况:

    • 传统的代码书方法在大数据和超级计算时代与信息容量和安全性作斗争.
    • 蛮力攻击对传统的加密技术构成重大威胁.
    • 现有的光学加密方法需要加强,以提高安全性和数据处理.

    研究的目的:

    • 提出一个计算全息光学代码书系统,以克服传统方法的局限性.
    • 增强信息能力和防范暴力攻击的安全性.
    • 为了利用混乱的系统进行强大的加密密钥生成和管理.

    主要方法:

    • 开发一个五维的哈密尔顿保守混沌系统 (FHCCS),用于生成混乱序列.
    • 实现光学密钥混合加密,使用混乱序列进行代码书和密码文本加密.
    • 使用计算机生成全息图 (CGH) 创建光学代码本,并使用混合加密,包含混乱的光学密钥.

    主要成果:

    • 拟议的系统具有高度安全性和庞大的信息容量.
    • 实现了快速解密速度,保留了光学加密的优势.
    • 光学代码书表现出强烈的抗击野蛮武力的攻击,验证了它的实际价值.

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    Last Updated: Jun 16, 2025

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    Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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    结论:

    • 基于FHCCS的计算全息光学代码书为大数据加密提供了安全有效的解决方案.
    • 混合加密策略显著扩大了密钥空间,使其几乎无法破解.
    • 该系统具有相当大的实用价值,因为其增强了安全性,容量和抗攻击能力.