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相关概念视频

Measurements of Strain01:27

Measurements of Strain

957
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
957
True Stress and True Strain01:28

True Stress and True Strain

317
Engineering stress is calculated as the load divided by the original, undeformed cross-sectional area. It approximates a material under load. This approximation is especially relevant post-yield in ductile materials. Though engineering stress-strain diagrams are often used for their convenience and accessibility, they can sometimes fall short in accuracy, particularly when dealing with large strain values.
In contrast, true stress offers a more precise portrayal. It is computed by dividing the...
317
Shearing Strain01:20

Shearing Strain

287
The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between...
287
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

270
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
270
Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

728
The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
728
Stress-Strain Diagram01:10

Stress-Strain Diagram

662
A stress-strain diagram is a crucial tool that graphically displays a material's mechanical characteristics. This diagram is derived from a tensile test performed on a carefully prepared cylindrical specimen. The specimen has two gauge marks inscribed on its central part, and the distance between these marks is known as the gauge length. The cylindrical specimen is placed in a testing machine, which applies an increasing centric load. As this load grows, so does the gauge length. This...
662

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相关实验视频

Updated: Jul 8, 2025

Production of a Strain-Measuring Device with an Improved 3D Printer
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Production of a Strain-Measuring Device with an Improved 3D Printer

Published on: January 30, 2020

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在菌株表征中实施强度量化的四种方法

Luca Torello Pianale1, Fabio Caputo1, Lisbeth Olsson2

  • 1Industrial Biotechnology Division, Department of Life Sciences, Chalmers University of Technology, Gothenburg, Sweden.

Biotechnology for biofuels and bioproducts
|December 20, 2023
PubMed
概括

在工业生物工艺中实施了强度量化,使用四种方法来评估酵母菌株. 乙醇红在各种纤维素化物中表现出优越的稳定性,突出显示了其工业潜力.

关键词:
生物工艺 生物工艺生物传感器是一种生物传感器.细胞内环境 细胞内环境生理学 生理学 生理学这种植物是Saccharomyces cerevisiae.酵母酵母是一种酵母.

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Using Digital Image Correlation to Characterize Local Strains on Vascular Tissue Specimens
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Using Digital Image Correlation to Characterize Local Strains on Vascular Tissue Specimens

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Intermediate Strain Rate Material Characterization with Digital Image Correlation
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Intermediate Strain Rate Material Characterization with Digital Image Correlation

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相关实验视频

Last Updated: Jul 8, 2025

Production of a Strain-Measuring Device with an Improved 3D Printer
06:17

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Published on: January 30, 2020

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Using Digital Image Correlation to Characterize Local Strains on Vascular Tissue Specimens
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Intermediate Strain Rate Material Characterization with Digital Image Correlation
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科学领域:

  • 微生物学 微生物学
  • 生物技术是生物技术.
  • 系统生物学 系统生物学

背景情况:

  • 工业生物工艺通常优先考虑性能而不是稳定性,定义为稳定的性能维护.
  • 在常规实验程序中量化和实施稳定性存在重大挑战.
  • 本研究介绍了将强度量化纳入菌株特征的四种方法.

研究的目的:

  • 在工业生物工艺中开发和实施量化微生物强度的方法.
  • 为了评估不同的酵母菌株 (Saccharomyces cerevisiae实验室菌株CEN.PK113-7D,乙醇红,PE2) 的稳定性,使用基纤维素水解剂.
  • 评估与生长相关的功能和细胞内参数,以进行全面的强度评估.

主要方法:

  • 使用了高通量试验装置和高通量试验装置来量化强度.
  • 评估了七种不同的林氏纤维素化物和不同酵母菌株的生长功能的稳定性.
  • 通过光生物传感器测量了八个细胞内参数的稳定性,随着时间的推移和细胞群体内的稳定性.

主要成果:

  • 乙醇红在所有测试条件下表现出最高的生长功能强度.
  • PE2显示出最大的种群异质性,表明显著的细胞内变异.
  • 红纤维素解酸盐类型影响了细胞内环境,诱导氧化应激或未折叠的蛋白质反应.

结论:

  • 强度量化为对菌株特征的生理和生化参数提供了有价值的见解.
  • 开发的方法是多用途的,在单细胞和高通量水平上都得到了验证.
  • 这种方法为微生物菌株开发和生物过程优化中的各种应用提供了显著的潜力.