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

Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

2.2K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
2.2K
Buoyancy and Stability for Submerged and Floating Bodies01:11

Buoyancy and Stability for Submerged and Floating Bodies

1.7K
In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
1.7K
Buoyancy00:59

Buoyancy

9.9K
When an object is placed in a fluid, it either floats or sinks. All objects in a fluid experience a buoyant force. For example, a metal ball sinks, while a rubber ball floats. Similarly, a submarine can sink and float by adjusting its buoyancy.  The concept of buoyancy raises several interesting questions. For instance, where does this buoyant force come from? How much buoyant force is required to make an object sink or float? Do objects that sink get any support at all from the...
9.9K
Density and Archimedes' Principle01:05

Density and Archimedes' Principle

6.6K
When a lump of clay is dropped into water, it sinks. But if the same lump of clay is molded into the shape of a boat, it starts to float. Because of its shape, the clay boat displaces more water than the lump and experiences a greater buoyant force, even though its mass is the same. The same holds true for steel ships. The average density of an object majorly determines if the object will float. If an object's average density is less than that of the surrounding fluid, it will float. The...
6.6K
Design Example: Application of Archimedes' Principle01:11

Design Example: Application of Archimedes' Principle

149
Archimedes' principle is fundamental in analyzing the buoyant force and stability of floating bodies. In this example, a wooden block with a rectangular section floats in seawater. Based on the block's dimensions, its specific gravity and the specific weight of seawater are used to find the volume of water displaced and the center of buoyancy.
The volume of seawater displaced by the block is determined by first calculating the block's weight. This is done by multiplying the...
149
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

3.3K
For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
3.3K

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

Sesquiterpene lactones from the roots of Lindera strychnifolia.

Phytochemistry·2012
Same author

Performance of single particle fritted capillary columns in electrochromatography.

Journal of chromatography. A·2012
Same author

[Characteristics of 11 patients with acute myeloid leukemia accompanied with karyotype aberration t(6;9)].

Zhongguo shi yan xue ye xue za zhi·2012
Same author

Interval cancers in nasopharyngeal carcinoma screening: comparing two screening intervals after a negative initial screening result.

Journal of medical screening·2012
Same author

The miR-183/96/182 cluster regulates oxidative apoptosis and sensitizes cells to chemotherapy in gliomas.

Current cancer drug targets·2012
Same author

Two Epstein-Barr virus-related serologic antibody tests in nasopharyngeal carcinoma screening: results from the initial phase of a cluster randomized controlled trial in Southern China.

American journal of epidemiology·2012

相关实验视频

Updated: Jun 14, 2025

Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
09:37

Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold

Published on: October 23, 2015

12.6K

聚合物矩阵固体浮力材料的最新趋势:一篇评论

Xingcan Lu1, Yu Li1, Ze Chen1

  • 1Department of Chemistry and Materials, Naval University of Engineering, Wuhan 430033, China.

Polymers
|August 29, 2024
PubMed
概括

聚合物矩阵固体浮力材料 (PSBMs) 为海洋工程提供了卓越的性能. 本综述详细介绍了它们的制备和特性,重点关注矩阵和填充剂的进步,以提高在恶劣环境中的性能.

科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物科学 聚合物科学
  • 海洋工程 海洋工程

背景情况:

  • 聚合物矩阵固体浮力材料 (PSBMs) 对于海洋应用至关重要,因为它们的密度低,强度高,吸水率低.
  • 在恶劣的海洋环境中提高PSBM性能是关键的研究领域.

研究的目的:

  • 综合总结单组件和多组件PSBM的制备方法和特性.
  • 审查PSBM研究的进展,重点关注矩阵和填充元件.

主要方法:

  • 对现有PSBM研究进行系统审查.
  • 分析热固化和热塑性树脂作为矩阵.
  • 检查填充剂,如空洞玻璃,陶和聚合物微球,以及飞灰.

主要成果:

  • 详细了解各种PSBM的制备和特性.
  • 评估不同的矩阵树脂和填充材料.
  • 识别PSBM发展中的趋势和挑战.

结论:

  • PSBM 是用于海洋工程的多功能材料.
  • 对矩阵填充剂相互作用的进一步研究可以优化材料性能.
关键词:
浮力材料是一种浮力材料.有空洞的微球.界面的修改是界面的修改.聚合物是一种聚合物.

更多相关视频

Microbubble Fabrication of Concave-porosity PDMS Beads
11:52

Microbubble Fabrication of Concave-porosity PDMS Beads

Published on: December 15, 2015

8.3K
Author Spotlight: A Stable Phantom Material for Optical and Acoustic Imaging
04:54

Author Spotlight: A Stable Phantom Material for Optical and Acoustic Imaging

Published on: June 16, 2023

2.8K

相关实验视频

Last Updated: Jun 14, 2025

Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
09:37

Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold

Published on: October 23, 2015

12.6K
Microbubble Fabrication of Concave-porosity PDMS Beads
11:52

Microbubble Fabrication of Concave-porosity PDMS Beads

Published on: December 15, 2015

8.3K
Author Spotlight: A Stable Phantom Material for Optical and Acoustic Imaging
04:54

Author Spotlight: A Stable Phantom Material for Optical and Acoustic Imaging

Published on: June 16, 2023

2.8K
  • 这一审查为未来的PSBM调查提供了基础.