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Measurements of Strain01:27

Measurements of Strain

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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...
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Strain Energy01:13

Strain Energy

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Strain energy is a fundamental concept in the field of materials science and structural engineering, describing the energy absorbed by a material or structure when it is deformed under load.
Consider a rod that is fixed at one end and subjected to an axial force at the free end. This axial force induces stress within the rod, leading to its elongation. As the axial force increases, so does the elongation of the rod, illustrating a direct relationship between the force applied and the resulting...
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Esophageal Strictures-I: Introduction01:30

Esophageal Strictures-I: Introduction

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Esophageal strictures involve abnormal narrowing or tightening of the esophagus. They vary in length and severity, ranging from mild constriction to complete obstruction, and are classified as benign (noncancerous) or malignant (cancerous).
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True Stress and True Strain01:28

True Stress and True Strain

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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...
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Strain-Energy Density01:20

Strain-Energy Density

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Understanding the strain energy density in materials under axial load is crucial for evaluating their mechanical behavior and durability. When a rod is subjected to such a load, it elongates and stores energy, known as strain energy, as potential energy within the material. This energy is measured in terms of energy per unit volume.
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Thermal Strain01:19

Thermal Strain

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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Assessment of DNA Contamination in RNA Samples Based on Ribosomal DNA
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Striga.

J Musembi Mutuku1, Ken Shirasu2

  • 1Biosciences eastern and central Africa - International Livestock Research Institute (BecA-ILRI) Hub, Nairobi, Kenya; Department of Plant Sciences, University of Cambridge, Cambridge, UK.

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|October 23, 2019
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Summary
This summary is machine-generated.

This study introduces the parasitic plant genus Striga. It provides foundational information on these agriculturally significant weeds.

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Area of Science:

  • Botany
  • Plant Science
  • Agricultural Science

Background:

  • Parasitic plants pose significant threats to global agriculture.
  • The genus Striga, commonly known as witchweed, includes many destructive agricultural pests.

Purpose of the Study:

  • To provide a comprehensive introduction to the parasitic plant genus Striga.
  • To consolidate existing knowledge on Striga taxonomy, biology, and ecological impact.

Main Methods:

  • Literature review and synthesis of existing research on Striga.
  • Taxonomic classification and description of key Striga species.

Main Results:

  • Detailed overview of the genus Striga, including its evolutionary history and diversity.
  • Identification of major Striga species and their host plant interactions.
  • Discussion of the economic and ecological impacts of Striga infestations.

Conclusions:

  • Striga represents a critical genus in plant science and agriculture due to its parasitic nature.
  • Further research into Striga biology and control strategies is essential for mitigating crop losses.