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Related Concept Videos

Beams01:30

Beams

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Beams are integral components of structural engineering and construction, designed to support loads applied at various points along their length. These long, straight members can be classified based on geometry, cross-section, support type, and equilibrium condition.
Based on geometry, beams can be straight, tapered, or curved. Straight beams are the most common type and have a constant cross-section throughout their length. Tapered beams, on the other hand, have a varying cross-section along...
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Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Deflection of a Beam01:19

Deflection of a Beam

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Accurately determining beam deflection and slope under various loading conditions in structural engineering is crucial for ensuring safety and structural integrity. Singularity functions offer a streamlined approach to analyzing beams, especially when multiple loading functions complicate the bending moment equation.
Singularity functions, described in an earlier lesson, are powerful mathematical tools that represent discontinuities within a function commonly encountered in structural loading...
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Prismatic Beams: Problem Solving01:15

Prismatic Beams: Problem Solving

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In the design of a supported timber beam subjected to a distributed load, both the beam's physical dimensions and the timber's characteristics, such as its grade and species, are critical. These factors determine the allowable stress values, which are crucial for calculating the necessary beam depth to ensure structural integrity and safety.
The design begins with analyzing the beam as a free body to identify moments and force balances, thereby determining support reactions. Next, the...
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Principal Stresses in a Beam01:11

Principal Stresses in a Beam

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In prismatic beams subject to arbitrary transverse loading, It is essential to analyze the interaction between shear forces and bending moments in order to understand stress distribution and ensure structural integrity. The highest normal or bending stress occurs at the outer fibers of the beam, decreasing linearly to zero at the neutral axis. In contrast, shear stress peaks at the neutral axis and diminishes toward the outer surfaces.
Analyzing principal stresses is crucial, especially in...
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Beams with Symmetric Loadings01:15

Beams with Symmetric Loadings

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The moment-area method is an analytical tool used in structural engineering to determine the slope and deflection of beams under various loads. Consider a cantilever with a concentrated load and moment at the free end. The first step is constructing a free-body diagram to calculate the reactions at the fixed end. Next, the bending moment diagram is plotted to visualize how the bending moment varies along the beam's length, focusing on points where the bending moment equals zero.
The M/EI...
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Related Experiment Video

Updated: Feb 9, 2026

Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization
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Quantification and optimization of ADF-STEM image contrast for beam-sensitive materials.

Karthikeyan Gnanasekaran1, Gijsbertus de With1, Heiner Friedrich1,2

  • 1Laboratory of Materials and Interface Chemistry, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Eindhoven, The Netherlands.

Royal Society Open Science
|June 13, 2018
PubMed
Summary

This study presents a method to optimize scanning transmission electron microscopy (STEM) imaging for beam-sensitive, low-contrast materials. The technique enhances analysis of thick specimens, crucial for nanomaterials and dynamic experiments.

Keywords:
Monte Carlo simulationsbeam-sensitive materialselectron doseimage contrastlow-contrast materialsscanning transmission electron microscopy

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Area of Science:

  • Materials Science
  • Electron Microscopy

Background:

  • Analyzing beam-sensitive and low-contrast functional materials using scanning transmission electron microscopy (STEM) is challenging, especially for thick specimens.
  • Investigating nanomaterials or dynamic processes in liquid cells exacerbates these difficulties due to low contrast and beam damage.

Purpose of the Study:

  • To develop and validate a method for optimizing annular dark-field (ADF) STEM imaging conditions and detector geometries.
  • To improve the analysis of thick, beam-sensitive, and low-contrast materials.

Main Methods:

  • Utilized Monte Carlo simulations to predict optimal contrast conditions.
  • Performed quantitative ADF-STEM imaging experiments to verify simulation predictions.
  • Applied the method to a carbon nanotube/polymer nanocomposite and a polymer vesicle in a liquid cell.

Main Results:

  • Successfully optimized ADF-STEM imaging for a challenging carbon nanotube/polymer nanocomposite.
  • Demonstrated the method's adaptability to a polymer vesicle in a TEM liquid cell.
  • Provided a predictive framework for experimental feasibility and optimal imaging parameters.

Conclusions:

  • The presented method effectively enhances contrast and feasibility for analyzing difficult specimens in STEM.
  • This approach is generalizable to various beam-sensitive and low-contrast materials.
  • Offers guidance for researchers on experimental design and parameter selection in electron microscopy.