Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models00:57

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

335
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...
335
Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion03:48

Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion

31.1K
Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
31.1K
Carrier Transport01:21

Carrier Transport

915
The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
915
Linear Approximation in Time Domain01:21

Linear Approximation in Time Domain

347
Nonlinear systems often require sophisticated approaches for accurate modeling and analysis, with state-space representation being particularly effective. This method is especially useful for systems where variables and parameters vary with time or operating conditions, such as in a simple pendulum or a translational mechanical system with nonlinear springs.
For a simple pendulum with a mass evenly distributed along its length and the center of mass located at half the pendulum's length,...
347
Diffusion01:12

Diffusion

216.4K
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...
216.4K
Diffusion01:21

Diffusion

6.2K
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...
6.2K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Natural microcosms in ecology: fulfilling the promise of model systems?

Philosophical transactions of the Royal Society of London. Series B, Biological sciences·2026
Same author

Linking species local trends from assemblage monitoring to global extinction risk.

Nature communications·2026
Same author

Biomedical open source software: Crucial packages and hidden heroes.

PLoS computational biology·2026
Same author

Ethical Frameworks for Conducting Social Challenge Studies.

Journal of empirical research on human research ethics : JERHRE·2026
Same author

Biodiversity Trends Show an Excess of Both Near Stasis and of Very Large Change.

Ecology letters·2026
Same author

Innate defense mechanisms against Nosema ceranae in hygienic honey bee (Apis mellifera) colonies.

PloS one·2026
Same journal

Desert lizards modulate nutritional responses to match seasonal biological needs.

Royal Society open science·2026
Same journal

Multi-generational fidelity, ecological and social determinants of roosting in a cooperatively breeding bird (<i>Argya squamiceps</i>).

Royal Society open science·2025
Same journal

Multifaceted polarization and information reliability in climate change discussions on social media platforms.

Royal Society open science·2025
Same journal

Comparing the kinematics related to inflicted head injury between violent shaking of a 6-week-old and a 1-year-old infant surrogate.

Royal Society open science·2025
Same journal

Partner choice increases observed reciprocity-based cooperation but decreases unobserved stake-based cooperation.

Royal Society open science·2025
Same journal

Importation models for travel-related SARS-CoV-2 cases reported in Newfoundland and Labrador during the COVID-19 pandemic.

Royal Society open science·2025
查看所有相关文章

相关实验视频

Updated: Jan 18, 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

8.4K

随机扩散使用平均场极限来近似总方程.

Laurent Hébert-Dufresne1,2,3, Matthew M Kling4,5, Samuel F Rosenblatt1,2

  • 1Vermont Complex Systems Institute, University of Vermont, Burlington, VT, USA.

Royal Society open science
|September 11, 2025
PubMed
概括
此摘要是机器生成的。

新的平均场模型准确地跟踪随机扩散,改善了对流行病和物种范围转移的预测. 这种方法提供了一个局部精确的方法,它改进了传统的决定性模型.

关键词:
疾病模型 疾病模型生态扩散 生态扩散变种群是指一个变种群.时间空间的动态.随机的过程是随机的过程.

更多相关视频

Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules
10:20

Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules

Published on: September 5, 2019

8.8K
Image Processing Protocol for the Analysis of the Diffusion and Cluster Size of Membrane Receptors by Fluorescence Microscopy
12:15

Image Processing Protocol for the Analysis of the Diffusion and Cluster Size of Membrane Receptors by Fluorescence Microscopy

Published on: April 9, 2019

9.2K

相关实验视频

Last Updated: Jan 18, 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

8.4K
Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules
10:20

Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules

Published on: September 5, 2019

8.8K
Image Processing Protocol for the Analysis of the Diffusion and Cluster Size of Membrane Receptors by Fluorescence Microscopy
12:15

Image Processing Protocol for the Analysis of the Diffusion and Cluster Size of Membrane Receptors by Fluorescence Microscopy

Published on: April 9, 2019

9.2K

科学领域:

  • 数学生物学 数学生物学
  • 计算生态学计算生态学
  • 流行病学 流行病学

背景情况:

  • 随机扩散模拟了流行病和物种范围的传播,这对于流行病准备和气候变化适应至关重要.
  • 目前的建模依赖于计算上昂贵的模拟或不准确的确定性工具,忽视随机性.
  • 对空间动态的准确建模对于理解生态和流行病学过程至关重要.

研究的目的:

  • 介绍"平均FLAME"模型,用于使用近似总方程跟踪随机分散.
  • 提供局部精确的建模方法,弥合详细的随机模拟和简化的决定性模型之间的差距.
  • 提高模拟灭绝事件,流行异质性和空间扩散速度的准确性.

主要方法:

  • 开发了基于近似总方程的"平均FLAME"模型,以跟踪系统状态的概率分布.
  • 将模型应用于捕食者-猎物系统,疾病动态和非线性分散场景.
  • 研究了用于灭绝建模的吸收状态附近跟踪关键状态的准确性.

主要成果:

  • 平均火焰模型通过跟踪基本状态,准确地预测掠食者-猎物系统的灭绝.
  • 经典的平均场模型低估了流行病的异质性,强调了随机性的重要性.
  • 确定性工具无法在非线性模型中捕捉空间扩散的真实速度.

结论:

  • 平均FLAME模型在模拟随机扩散的传统方法上提供了显著的改进.
  • 准确的随机性建模对于理解边缘区域的过程至关重要,例如物种范围边缘和小种群流行病.
  • 这种方法提高了对流行病的准备和适应气候驱动范围变化的能力.