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相关概念视频

Plasticizers01:31

Plasticizers

358
Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
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Plasticity00:58

Plasticity

3.0K
Plasticity is the property where an object loses its elasticity and undergoes irreversible deformation, even after the deformation forces are eliminated. If a material deforms irreversibly without increasing stress or load, then this is called ideal plasticity. For example, when a force is applied to an aluminum rod, it changes its shape, but it does not return to its original shape once the force is removed. Plastic deformation or ductility is thus a permanent deformation or change in the...
3.0K
Plastic Behavior01:21

Plastic Behavior

540
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
540
Plastic Deformations01:14

Plastic Deformations

412
It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
412
Plastic Deformations01:19

Plastic Deformations

444
Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
444
State Space Representation01:27

State Space Representation

547
The frequency-domain technique, commonly used in analyzing and designing feedback control systems, is effective for linear, time-invariant systems. However, it falls short when dealing with nonlinear, time-varying, and multiple-input multiple-output systems. The time-domain or state-space approach addresses these limitations by utilizing state variables to construct simultaneous, first-order differential equations, known as state equations, for an nth-order system.
Consider an RLC circuit, a...
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相关实验视频

Updated: Jan 27, 2026

Clean Sampling and Analysis of River and Estuarine Waters for Trace Metal Studies
10:44

Clean Sampling and Analysis of River and Estuarine Waters for Trace Metal Studies

Published on: July 1, 2016

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从太空探测河流塑料热点检测

Ámbar Pérez-García1,2, Graciela Amanda2, José F López1

  • 1Institute for Applied Microelectronics, University of Las Palmas de Gran Canaria, 35001 Las Palmas de Gran Canaria, Spain.

iScience
|January 26, 2026
PubMed
概括
此摘要是机器生成的。

科学家们使用卫星数据和人工智能开发了一种新方法,用于在河流中找到塑料污染热点. 这种可扩展的方法可以改善监测,并有助于更有效地针对清理工作.

关键词:
地球科学 地球科学环境科学环境科学污染 污染 污染遥感是一种远程传感.

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相关实验视频

Last Updated: Jan 27, 2026

Clean Sampling and Analysis of River and Estuarine Waters for Trace Metal Studies
10:44

Clean Sampling and Analysis of River and Estuarine Waters for Trace Metal Studies

Published on: July 1, 2016

12.0K
Trajectory Data Analyses for Pedestrian Space-time Activity Study
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Extraction of Organochlorine Pesticides from Plastic Pellets and Plastic Type Analysis

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科学领域:

  • 环境科学 环境科学
  • 遥感 遥感 遥感 遥感
  • 机器学习 机器学习

背景情况:

  • 塑料污染是全球环境危机,河流是塑料垃圾的主要输送道.
  • 识别河流中的塑料积累热点对于有效的缓解策略至关重要.
  • 目前用于检测河流塑料的方法通常在规模和可访问性方面受到限制.

研究的目的:

  • 开发和验证一个可扩展的,半自动化的管道,用于检测河流塑料积累热点.
  • 整合卫星遥感和机器学习,以加强塑料污染监测.
  • 评估开发的方法在不同河流系统的可转移性.

主要方法:

  • 使用谷歌地球引擎创建了一个半自动化,基于云的管道.
  • 高分辨率的PlanetScope图像用于训练数据注释.
  • 用 Sentinel-2 多光谱数据和随机森林分类器来检测热点.
  • 这种方法在Citarum,Motagua和Odaw河流系统上进行了测试.

主要成果:

  • 该管道在检测河流中的塑料热点方面取得了高精度 (高达99.5%).
  • 该模型的优化跨河转移导致塑料F1得分达到79%,超过了之前的基准值 (69%).
  • 该方法证明了在研究的河流系统中的各种环境条件中具有可转移性.

结论:

  • 开发的基于卫星的管道为监测河流塑料污染提供了可重复和可扩展的解决方案.
  • 这种方法支持制定评估和管理河流塑料污染的全球战略.
  • 开放访问的谷歌地球引擎应用程序促进了广泛采用和进一步研究.