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相关概念视频

Entropy Change in Reversible Processes01:10

Entropy Change in Reversible Processes

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In the Carnot engine, which achieves the maximum efficiency between two reservoirs of fixed temperatures, the total change in entropy is zero. The observation can be generalized by considering any reversible cyclic process consisting of many Carnot cycles. Thus, it can be stated that the total entropy change of any ideal reversible cycle is zero.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
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Standard Entropy Change for a Reaction03:00

Standard Entropy Change for a Reaction

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Entropy is a state function, so the standard entropy change for a chemical reaction (ΔS°rxn) can be calculated from the difference in standard entropy between the products and the reactants.
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Entropy and Solvation02:05

Entropy and Solvation

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The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
7.2K
Entropy and the Second Law of Thermodynamics01:20

Entropy and the Second Law of Thermodynamics

3.1K
The second law of thermodynamics can be stated quantitatively using the concept of entropy. Entropy is the measure of disorder of the system.
The relation  between entropy and disorder can be illustrated with the example of the phase change of ice to water. In ice, the molecules are located at specific sites giving a solid state, whereas, in a liquid form, these molecules are much freer to move. The molecular arrangement has therefore become more randomized. Although the change in average...
3.1K
Convolution: Math, Graphics, and Discrete Signals01:24

Convolution: Math, Graphics, and Discrete Signals

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In any LTI (Linear Time-Invariant) system, the convolution of two signals is denoted using a convolution operator, assuming all initial conditions are zero. The convolution integral can be divided into two parts: the zero-input or natural response and the zero-state or forced response, with t0 indicating the initial time.
To simplify the convolution integral, it is assumed that both the input signal and impulse response are zero for negative time values. The graphical convolution process...
400
Hückel's Rule Diagram of π MOs: Frost Circle01:08

Hückel's Rule Diagram of π MOs: Frost Circle

4.7K
The Frost circle or the inscribed polygon method is a graphical method for determining the relative energies of π molecular orbitals (MOs) for planar, fully conjugated, and monocyclic compounds. This method was first described by A. A. Frost and Boris Musulin in 1953.
A Frost circle is constructed by drawing a polygon whose number of edges is equal to the number of carbons of the given cyclic system, with one of the vertices pointing down. Then, a circle is drawn enclosing the polygon so...
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相关实验视频

Updated: Sep 11, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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一个使用优化混乱地图的高图像加密方案,使用约瑟夫的排列策略.

Nawal El Ghouate1, Mohamed Amine Tahiri1, Ahmed Bencherqui1

  • 1Laboratory of Engineering, Systems and Applications, National School of Applied Sciences, Sidi Mohamed Ben Abdellah University, Fez, Morocco.

Scientific reports
|August 11, 2025
PubMed
概括
此摘要是机器生成的。

这项研究介绍了一种使用混乱地图和约瑟夫问题的新型图像加密算法. 该方法提高了医疗和监控中保护敏感数字图像的安全性和速度.

关键词:
混乱的开普勒优化器加密过程中的加密过程.约瑟夫·约瑟夫的问题

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High-Throughput Analysis of Optical Mapping Data Using ElectroMap
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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

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相关实验视频

Last Updated: Sep 11, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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High-Throughput Analysis of Optical Mapping Data Using ElectroMap
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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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科学领域:

  • 计算机科学 计算机科学
  • 密码学 密码学 密码学
  • 图像处理 图像处理

背景情况:

  • 数字数据交换需要强大的图像保护,特别是在医学,监视和安全通信方面.
  • 由于像素冗余和相关性,传统的加密方法 (DES,AES,RSA) 对图像是不理想的.
  • 现有的图像加密方案经常面临速度和计算复杂性的挑战.

研究的目的:

  • 开发一种新的,弹性和高效的图像加密算法,克服传统方法的局限性.
  • 通过使用混乱地图,通过最佳扩散和像素混来增强图像安全性.
  • 改进密钥生成并减少处理时间,同时保持高加密质量.

主要方法:

  • 一个新的图像加密算法,结合了混乱的地图和可变步骤的约瑟夫问题.
  • 开普勒混乱优化算法 (CKOA) 用于选择最佳的混乱地图.
  • MD5和SHA-256哈希函数用于安全的密钥生成.
  • 离散波纹转换 (DWT) 用于图像压缩和减少处理时间.

主要成果:

  • 对于加密图像,实现了7.999的高平均.
  • 对加密攻击具有很强的抵抗力,像素变化率为99.6%,统一平均变化强度为33.31%.
  • 与现有方案相比,拟议的算法提供了更高的安全性.

结论:

  • 新的图像加密算法提供了增强的安全性,速度和减少的计算复杂性.
  • 混沌地图,约瑟夫问题和DWT的整合为图像保护提供了一个强大的解决方案.
  • 这种方法非常适合在各种关键领域的敏感图像数据.