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相关概念视频

DNA Topoisomerases02:02

DNA Topoisomerases

31.3K
Topoisomerases are enzymes that relax overwound DNA molecules during various cell processes, including DNA replication and transcription. These enzymes regulate positive and negative DNA supercoiling without changing the nucleotide sequence. DNA overwinding in a clockwise direction results in positively supercoiled DNA, whereas underwinding in a counterclockwise direction produces negatively supercoiled DNA.
Types and Mechanism of action
Topoisomerases are divided into two main types. ...
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Stress Concentrations01:24

Stress Concentrations

286
Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller...
286
Unsymmetric Loading of Thin-Walled Members01:23

Unsymmetric Loading of Thin-Walled Members

110
Thin-walled members with non-symmetrical cross-sections are vital to engineering structures, offering material efficiency and structural integrity. However, unsymmetrical loading on these members leads to complex stress distributions, resulting in simultaneous bending and twisting can cause deformation or structural failure. The interaction between bending and twisting requires detailed analysis to ensure structural resilience.
The concept of the shear center is crucial in countering the...
110

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相关实验视频

Updated: Jun 26, 2025

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
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控制活跃拓缺陷的设计规则.

Suraj Shankar1,2, Luca V D Scharrer3,4, Mark J Bowick3,5

  • 1Department of Physics, Harvard University, Cambridge, MA 02138.

Proceedings of the National Academy of Sciences of the United States of America
|May 15, 2024
PubMed
概括
此摘要是机器生成的。

科学家们开发了一种新方法,使用活跃的拓子来控制活跃流体中的缺陷. 这允许缺陷的创建,移动和编织,使可编程活性材料成为可能.

关键词:
有活性物质的活性物质.控制 控制 控制 控制流体动力学 流体动力学液晶是一种液体晶体.拓上的缺陷 拓上的缺陷

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Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
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Atomically Traceable Nanostructure Fabrication
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Last Updated: Jun 26, 2025

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
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Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
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科学领域:

  • 活性物质的物理学 活性物质的物理学
  • 软冷凝物质物理学的物理
  • 非平衡的统计力学.

背景情况:

  • 拓缺陷在各种材料中至关重要,如磁铁和液晶.
  • 在活性流体中,缺陷就像自动运动的粒子一样,驱动混乱的流动.
  • 控制缺陷的时空行为是工程活性材料的关键,但缺乏设计原则.

研究的目的:

  • 提出基于对称性的添加剂策略,以精确控制活性流体中的拓缺陷.
  • 建立积极缺陷的时空操纵的设计原则.
  • 通过使用主动拓子来演示缺陷的创建,移动和编织.

主要方法:

  • 基于对称原则的理论建模.
  • 活动流体动力学的计算模拟.
  • 利用空间活动梯度作为"电场"用于缺陷操纵.

主要成果:

  • 通过使用主动拓子来控制缺陷,演示了添加策略.
  • 展示了空间活动梯度如何诱导缺陷的反向拓极化.
  • 在动态环境中成功地模拟和运输相互作用的活性缺陷.

结论:

  • 已经建立了一个用于雕塑流动和操纵空间和时间中的活跃缺陷的附加框架.
  • 这种方法可以设计可编程的活体和活体材料.
  • 潜在的应用包括运输,内存和逻辑设备.