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

Basic Equation for Pressure Field01:13

Basic Equation for Pressure Field

199
The basic equation for a pressure field in fluid mechanics captures the balance of forces within any segment of fluid, providing a foundational understanding of how pressure changes within fluids under various forces. Generally, two main types of forces act on any part of a fluid: surface forces and body forces. Surface forces arise from pressure differences across points within the fluid, which result in net forces that can vary depending on the local pressure gradient. Body forces, on the...
199
Concept of Pressure at a Point01:15

Concept of Pressure at a Point

215
The concept of pressure at a point in a fluid establishes that pressure within a fluid is uniform in all directions at a specific location. This uniformity occurs because fluid molecules exert force evenly across any point due to their random motion and continuous collisions within the fluid. Pressure at a point is determined by the surrounding fluid molecules and is influenced by factors like depth and density, rather than by shape or orientation.
In a fluid at rest, pressure acts equally in...
215
Definition and Measurement of Pressure: Atmospheric Pressure, Barometer, and Manometer02:57

Definition and Measurement of Pressure: Atmospheric Pressure, Barometer, and Manometer

35.9K
Gas pressure is caused by force exerted by gas molecules colliding with the surfaces of objects. Although the force of each collision is very small, any surface of an appreciable area experiences a large number of collisions in a short time, which can result in high pressure.
35.9K
Control Volume and System Representations01:16

Control Volume and System Representations

871
Two key frameworks are employed to analyze mass, energy, and momentum transfer: the control volume approach and the system approach. These frameworks offer different perspectives, depending on whether the focus is on a specific region in space (control volume approach) or a defined mass of fluid (system approach).
The control volume approach considers a stationary region in space through which fluid flows. This region is bounded by a control surface.  For instance, in the case of water...
871
Pressure and Volume in an Adiabatic Process01:27

Pressure and Volume in an Adiabatic Process

2.6K
Free expansion of a gas is an adiabatic process. However, there are few differences between free expansion and adiabatic expansion. During free expansion, no work is done, and there is no change in internal energy. But, for an adiabatic expansion, work is done, and there is a change in internal energy. During an adiabatic process, the relation between the pressure and volume is obtained from the condition for the adiabatic process, that is, 
2.6K
Static, Stagnation, Dynamic and Total Pressure01:24

Static, Stagnation, Dynamic and Total Pressure

230
The concept of static, stagnation, dynamic, and total pressure is fundamental in fluid dynamics, often explained using Bernoulli's equation:
230

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

Widespread peat carbon losses driven by the 2025 Scottish megafire.

Nature geoscience·2026
Same authorSame journal

A Simple Stomatal Model That Unifies the Metabolic and Hydraulic Control of Carbon and Water Flux.

Global change biology·2026
Same author

Eddy Covariance Theory: A Review.

Global change biology·2026
Same author

Height does not impair the hydraulic system of the tallest tropical Dipterocarp trees.

Science (New York, N.Y.)·2026
Same author

Water Released From Vessel Embolism May Temporarily Halt Further Embolism in Tropical Dipterocarp Trees.

Plant, cell & environment·2026
Same author

Mechanisms and scales in modeling forest responses to changing disturbance regimes.

The New phytologist·2026

相关实验视频

Updated: Jun 8, 2025

Watershed Planning within a Quantitative Scenario Analysis Framework
12:44

Watershed Planning within a Quantitative Scenario Analysis Framework

Published on: July 24, 2016

8.0K

一个理论框架来量化生态系统的压力-体积关系.

Oliver Binks1, Patrick Meir2, Alexandra G Konings3

  • 1CREAF, Cerdanyola del Vallès, Barcelona, Spain.

Global change biology
|November 6, 2024
PubMed
概括

了解植被水的潜力和含水量是生态系统功能的关键. 这项研究将各种生态系统的水潜力和含量联系起来,找到与生物质的储水规模.

关键词:
生态水文学平衡理论生态系统的功能生态系统的功能生态系统水资源潜力 生态系统水资源潜力森林中的水含量.湿度释放曲线的曲线是树木液压系统 树木液压系统

更多相关视频

Cardiac Pressure-Volume Loop Analysis Using Conductance Catheters in Mice
08:15

Cardiac Pressure-Volume Loop Analysis Using Conductance Catheters in Mice

Published on: September 17, 2015

19.4K
Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
10:20

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter

Published on: March 12, 2013

13.3K

相关实验视频

Last Updated: Jun 8, 2025

Watershed Planning within a Quantitative Scenario Analysis Framework
12:44

Watershed Planning within a Quantitative Scenario Analysis Framework

Published on: July 24, 2016

8.0K
Cardiac Pressure-Volume Loop Analysis Using Conductance Catheters in Mice
08:15

Cardiac Pressure-Volume Loop Analysis Using Conductance Catheters in Mice

Published on: September 17, 2015

19.4K
Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
10:20

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter

Published on: March 12, 2013

13.3K

科学领域:

  • 生态生态学 生态生态学
  • 植物生理学 植物生理学
  • 遥感 遥感 遥感 遥感

背景情况:

  • 水的潜力对植被功能至关重要,但很难与生态系统的水流联系起来.
  • 遥感可以检测植被中的水含量,增加将其与生态系统过程相连接的需求.

研究的目的:

  • 审查和评估生态系统规模的水潜力和水含量之间的联系.
  • 探索生态系统中压力-体积 (PV) 关系的应用和限制.
  • 为扩大植物水关系从组织到生态系统水平提供一个框架.

主要方法:

  • 审查现有的压力-体积 (PV) 关系理论.
  • 使用平衡水潜力和含水量生成块规模的地面植被光伏曲线.
  • 分析了来自九个不同地块的数据,包括热带雨林,大草原和温带森林.

主要成果:

  • 发现生态系统容量和储存水量在不同系统中与生物质线性扩展.
  • 从生理上可访问的储水和生态系统液压容量与生物质没有系统变化.
  • 一种自下而上的缩放方法强调了水潜在分布和社区级植物组织分量的重要性.

结论:

  • 压力-体积关系可以应用于生态系统,但由于水量变化存在限制.
  • 该研究提供了一种方法,将组织规模的生物物理过程与陆地表面模型和遥感联系起来.
  • 这些发现有助于弥合微观植物生理学和宏观生态系统水力学之间的差距.