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相关概念视频

Waterproofing and Anti-Bacterial Admixtures in Concrete01:22

Waterproofing and Anti-Bacterial Admixtures in Concrete

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Concrete's susceptibility to water absorption is due to the capillary action within the pores of its hydrated cement paste. This action draws water in, creating the need for waterproofing admixtures to prevent such penetration. The efficacy of these admixtures is contingent upon the water pressure, with variations arising from different conditions such as rain, capillary rise, or hydrostatic pressure in structures intended to hold water.
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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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相关实验视频

Updated: Jul 16, 2025

Scalable Stamp Printing and Fabrication of Hemiwicking Surfaces
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Scalable Stamp Printing and Fabrication of Hemiwicking Surfaces

Published on: December 18, 2018

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强大的PDF水印对抗打印扫描攻击.

Lei Li1, Hong-Jun Zhang1, Jia-Le Meng2

  • 1Command and Control Engineering College, Army Engineering University, Nanjing 210007, China.

Sensors (Basel, Switzerland)
|September 9, 2023
PubMed
概括
此摘要是机器生成的。

本研究介绍了一种隐形数字水印技术,用于便携式文档格式 (PDF) 文件. 该方法增强了对打印扫描攻击的安全性,使得纸质和扫描文档的有效泄漏追踪成为可能.

关键词:
在PDF中保护PDF保护.数字水印是指数字水印.泄漏的追踪 泄漏的追踪打印扫描攻击强度 坚固性 坚固性

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科学领域:

  • 计算机科学 计算机科学
  • 信息安全 信息安全
  • 数字法医学数字法医学

背景情况:

  • 便携式文档格式 (PDF) 文件在文件交换中无处不在.
  • 当前的PDF水印方法经常在打印扫描攻击中失败,阻碍了泄漏追踪.
  • 强大且隐形的水印对于保护分布式文档至关重要.

研究的目的:

  • 为PDF文件开发一个看不见的数字水印技术.
  • 为了确保对泄漏追踪的打印扫描攻击的稳定性.
  • 为了保持对人类观察者的不可感知性.

主要方法:

  • 在原始PDF文档中修改文本笔画的边缘像素.
  • 分段文本行并根据像素密度改变特定的边缘像素.
  • 水印嵌入需要原始PDF来进行检测.

主要成果:

  • 实现了对打印扫描,JPEG压缩和噪声攻击的高强度.
  • 在超过32dB的峰值信号与噪声比 (PSNR) 值时,已被证明是不可感知.
  • 在JPEG压缩下提取隐藏信息时100%的准确性;在没有攻击的情况下无损恢复.

结论:

  • 拟议的方法为PDF水印提供了一个强大而隐形的解决方案.
  • 在分发后有效地追踪官方纸质文件的泄漏.
  • 解决了现有方法对打印扫描漏洞的局限性.