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Related Concept Videos

Diffusion01:12

Diffusion

Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
Diffusion01:21

Diffusion

Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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...
Modified-Release Drug Delivery Systems: Rate-Programmed I01:22

Modified-Release Drug Delivery Systems: Rate-Programmed I

Rate-programmed drug delivery systems (DDS) are designed to release drugs at specific, controlled rates to maintain consistent therapeutic levels. These systems are categorized based on their release mechanisms, including dissolution-controlled DDS, diffusion-controlled DDS, and combined dissolution-diffusion-controlled DDS.In dissolution-controlled DDS, the release rate depends on the slow dissolution of the drug itself or the surrounding matrix. Drugs with inherently slow dissolution rates,...
Theories of Dissolution: Diffusion Layer Model01:15

Theories of Dissolution: Diffusion Layer Model

Dissolution, the process by which drug particles dissolve in a solvent, is explained by the diffusion layer model, a theoretical framework that simulates the absorption of oral drugs and allows us to analyze experimental data.
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...

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Related Experiment Video

Updated: May 25, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
06:55

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

A chaos-based digital image encryption scheme with an improved diffusion strategy.

Chong Fu1, Jun-jie Chen, Hao Zou

  • 1School of Information Science and Engineering, Northeastern University, Shenyang 110004, China. fuchong@ise.neu.edu.cn

Optics Express
|February 15, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces an improved image encryption method using a novel bidirectional diffusion strategy. This enhances security and efficiency for real-time image transmission, requiring fewer encryption rounds.

Related Experiment Videos

Last Updated: May 25, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
06:55

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

Area of Science:

  • Cryptography
  • Image Processing
  • Network Security

Background:

  • Increasing demand for secure real-time image transmission over public networks.
  • Limitations in efficiency of existing permutation-diffusion image ciphers.

Purpose of the Study:

  • To propose an improved diffusion strategy for chaos-based image ciphers.
  • To enhance the efficiency and security of image encryption.

Main Methods:

  • Novel bidirectional diffusion strategy.
  • Plain-text related chaotic orbit turbulence mechanism.
  • Extensive cryptanalysis including differential, key space, statistical, and sensitivity analyses.

Main Results:

  • Significantly accelerated diffusion process.
  • Achieved high security with fewer encryption rounds.
  • Demonstrated satisfactory security level and low computational complexity.

Conclusions:

  • The proposed scheme is a strong candidate for real-time secure image transmission.
  • The bidirectional diffusion and chaotic orbit turbulence effectively improve encryption efficiency and security.