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相关概念视频

IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
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Computed Tomography01:10

Computed Tomography

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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Extraction: Partition and Distribution Coefficients01:14

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The distribution law or Nernst's distribution law is the law that governs the distribution of a solute between two immiscible solvents. This law, also known as the partition law, states that if a solute is added to the mixture of two immiscible solvents at a constant temperature, the solute is distributed between the two solvents in such a way that the ratio of solute concentrations in the solvents remains constant at equilibrium.
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Reconstruction of Signal using Interpolation01:10

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Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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相关实验视频

Updated: Jul 16, 2025

Cryo-Electron Tomography Remote Data Collection and Subtomogram Averaging
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一个用于多带遥感图像传输的联合加密和压缩算法.

Weijia Cao1,2, Xiaoran Leng1,2, Tao Yu1,2

  • 1Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China.

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

本研究介绍了用于多带遥感图像的联合加密和压缩算法 (JECA),提高了安全性并减少了预处理时间. JECA提供了改进的视觉安全性和关键灵敏度,用于安全的数据传输.

关键词:
这是一个二维无限崩地图.在 JPEG 文件中,您可以使用 JPEG.加密-然后-压缩系统.图像加密 图像加密远程传感图像传输 远程传感图像传输

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科学领域:

  • 遥感 遥感 遥感 遥感
  • 网络安全 网络安全
  • 图像处理 图像处理

背景情况:

  • 敏感的遥感图像数据需要在传输过程中得到强有力的保护,尤其是在跨越国际边界的过程中.
  • 现有的多带远程传感图像的联合压缩和加密方法存在长时间的预处理时间,有限的带兼容性和安全性不足的问题.
  • 网络威胁日益复杂,需要先进的解决方案来保护地理空间数据.

研究的目的:

  • 开发和评估一种用于多带遥感图像的新型联合加密和压缩算法 (JECA).
  • 解决现有方法的局限性,重点是减少预处理时间,多频段兼容性和增强安全性.
  • 提高传输敏感遥感数据的效率和安全性.

主要方法:

  • 提出了一个三阶段的算法:预处理加密,加密压缩和解码.
  • 将多个图像带拼接成一个灰度图像,然后使用混乱系统进行块级编码.
  • 加密的直流和交流系数,然后进行解密和块恢复以重建图像.

主要成果:

  • 与现有的方法相比,JECA减少了50%的发送者预处理时间.
  • 该算法证明了与多带遥感图像的兼容性.
  • 杰卡增强了安全性,特别是视觉安全性和密钥灵敏度,同时保持了压缩比.

结论:

  • JECA提供了一种更有效,更安全的解决方案,用于联合压缩和加密多带遥感图像.
  • 该算法有效地解决了以前方法的局限性,提高了数据传输安全性.
  • 在运输过程中,JECA提供了一种可靠的方法来保护敏感的遥感数据.