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相关概念视频

Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Two-dimensional Gel Electrophoresis01:22

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Two-dimensional gel electrophoresis is a high-resolution protein separation method first introduced by O' Farrell and Klose in 1975. This method involves protein separation by two dimensions, mass and charge, making it more accurate than one-dimensional gel electrophoresis.
The first dimension separation uses the isoelectric focusing or IEF technique performed on immobilized pH gradient (IPG) strips that separate proteins according to their isoelectric points.
Biological samples, such...
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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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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...
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相关实验视频

Updated: May 15, 2025

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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可分离的可逆数据被空置空间隐藏在使用加密的像素差异加密后.

Veeramuthu Venkatesh1, R Anushiadevi2, Padmapriya Velupillai Meikandan3

  • 1School of Computing, SASTRA Deemed University, Thanjavur, 613401, India.

Scientific reports
|April 8, 2025
PubMed
概括

本研究介绍了一种用于加密数字媒体的新型可分离可逆数据隐藏方法. 该SRDH-VRAE-EPD技术增强了安全性,并实现了高嵌入率的无损数据提取和图像恢复.

关键词:
图像加密 图像加密信息安全信息安全.无损数据隐藏,可以隐藏数据.可逆的数据隐藏方式可分离的可逆数据隐藏.史蒂冈图形 (Steganography) 是一种隐藏的图形.

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科学领域:

  • 信息安全 信息安全
  • 密码学 密码学 密码学 密码学
  • 数字法医学数字法医学

背景情况:

  • 互联网的增长需要先进的信息安全措施.
  • 密码学和隐形学是早期的方法,但有局限性.
  • 可逆数据隐藏 (RDH) 提供无损数据和媒体恢复.

研究的目的:

  • 通过使用加密像素差异 (SRDH-VRAE-EPD) 方法,在加密后通过空置房间隐藏新的可分离可逆数据.
  • 增强数据安全性和在数字媒体中嵌入效率.
  • 确保独立的提取和回收过程.

主要方法:

  • 结合了同态加密和加密的像素差异.
  • 采用一个空置房间后加密策略.
  • 使用加密的像素差异来隐藏数据.

主要成果:

  • 实现了1.2 bpp的嵌入率,超过了标准的VRAE算法.
  • 确保无损数据提取和图像恢复.
  • 提供对统计,差异和选定的纯文本攻击的高安全性.

结论:

  • 该SRDH-VRAE-EPD方法提供了一个可分离和安全的方法,用于隐藏在加密图像中的数据.
  • 它显著提高了嵌入率,同时保持了数据完整性.
  • 独立的提取和回收过程提高了可用性和安全性.