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相关概念视频

Control Volume and System Representations01:16

Control Volume and System Representations

979
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...
979
Pipe Flowrate Measurement01:28

Pipe Flowrate Measurement

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In pipe flow measurement, orifice, nozzle, and Venturi meters are commonly used to determine fluid flowrates by constricting the flow area, which increases fluid velocity and reduces pressure. This pressure difference, governed by Bernoulli's principle and adjusted for real-world conditions, is essential for calculating flowrate. Each meter type is suited to specific applications based on accuracy, efficiency, and compatibility with various flow conditions.
The orifice meter is a simple,...
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相关实验视频

Updated: Jun 11, 2025

BtM, a Low-cost Open-source Datalogger to Estimate the Water Content of Nonvascular Cryptogams
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一个新的基于输入-输出的框架来衡量主动和被动的用水量.

Lingfan Wu1, Yu Song1,2, Yueyang Li3

  • 1School of Business, Macau University of Science and Technology, Macau, 999078, China.

Heliyon
|September 30, 2024
PubMed
概括

本研究引入了一种双重视角的框架来衡量用水量,定义因经济变化而产生的波动,并为被动用水提供了一个新的指标. 它分析了用水道和供应链.

关键词:
双视角测量的测量假设的提取方法.输入-输出模型的模型.结构路径分析结构路径分析使用水 使用水 使用水

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A Low-Cost Method of Measuring the In Situ Primary Productivity of Periphyton Communities of Lentic Waters
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Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds
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Last Updated: Jun 11, 2025

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科学领域:

  • 环境科学 环境科学
  • 经济学 经济学 经济学
  • 供应链管理 供应链管理

背景情况:

  • 精确测量用水量对于可持续的资源管理至关重要.
  • 宏观经济变化对水消费模式产生重大影响.
  • 现有的框架可能无法完全捕捉间接或被动的用水.

研究的目的:

  • 开发一个双重视角的框架,用于全面测量用水量.
  • 定义和量化由宏观经济条件驱动的用水波动.
  • 引入一个新的指标来评估被动用水率.

主要方法:

  • 构建一个新的双视角用水量测量框架.
  • 定义与宏观经济状况变化相关的用水变化.
  • 应用结构路径分析 (SPA) 来估计被动用水道.

主要成果:

  • 从被动的角度使用SPA识别关键的用水道.
  • 量化宏观经济因素对用水动态的影响.
  • 证明供应链中介部门在用水方面的重要作用.

结论:

  • 拟议的双重视角框架为水资源会计提供了更全面的方法.
  • 了解被动用水对于有效的水资源政策和管理至关重要.
  • 供应链分析提供了对间接用水消耗的重要见解.