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Diffusion01:12

Diffusion

226.2K
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...
226.2K
Passive Diffusion: Overview and Kinetics01:17

Passive Diffusion: Overview and Kinetics

1.5K
Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting...
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Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models00:57

Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models

402
Physiological pharmacokinetic models, often called flow-limited or perfusion models, typically assume a swift drug distribution between tissue and venous blood, creating a rapid drug equilibrium. This premise is based on the idea that drug diffusion is extremely fast, and the cell membrane presents no barrier to drug permeation. In this scenario, where no drug binding occurs, the drug concentration in the tissue equals that of the venous blood leaving the tissue. This greatly simplifies the...
402

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Related Experiment Video

Updated: May 2, 2026

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
05:30

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Published on: September 8, 2023

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DADiffNet: Delay-aware diffusion networks with adaptive subgraphs for large scale traffic forecasting.

Yujie Fan1, Jing Chen2, Wenqiang Xu3

  • 1School of Computer Science and Technology, Hangzhou Dianzi University, Hangzhou, 310018, China.

Neural Networks : the Official Journal of the International Neural Network Society
|March 4, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces the Delay-Aware Diffusion Network (DADiffNet) for improved traffic forecasting. DADiffNet accurately predicts traffic flow by modeling perturbations and their delays, outperforming existing methods.

Keywords:
Diffusion networksGraph neural networksPropagation delaySpatiotemporal modelingSubgraph sampling

Related Experiment Videos

Last Updated: May 2, 2026

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Area of Science:

  • Transportation Science
  • Data Science
  • Network Analysis

Background:

  • Accurate traffic forecasting is crucial for urban areas with increasing traffic demand.
  • Existing methods struggle to capture upstream traffic perturbations and their downstream propagation delays.

Purpose of the Study:

  • To develop a novel network model for enhanced spatiotemporal traffic forecasting.
  • To explicitly address the challenge of modeling delayed diffusion of traffic perturbations.

Main Methods:

  • Proposes the Delay-Aware Diffusion Network (DADiffNet) that reformulates spatiotemporal coupling.
  • Models traffic-flow increments and uses adaptive subgraph structures for efficient topology encoding.
  • Employs temporal differences to capture high-frequency perturbations and propagation delays.

Main Results:

  • DADiffNet consistently outperformed fifteen baseline methods across eight real-world datasets.
  • Achieved average improvements of 8.04% in MAE, 7.65% in RMSE, and 8.40% in MAPE.
  • Demonstrated reduced memory consumption, enhancing accuracy, efficiency, and interpretability.

Conclusions:

  • DADiffNet offers a superior approach to large-scale traffic forecasting by explicitly modeling delays and perturbations.
  • The model provides a better balance between predictive accuracy, computational efficiency, and interpretability.
  • This advancement is vital for managing traffic in rapidly expanding urban environments.