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Related Concept Videos

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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Shearing Stresses in a Beam: Problem Solving01:14

Shearing Stresses in a Beam: Problem Solving

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A cantilever beam with a rectangular cross-section under distributed and point loads experiences shearing stresses. The analysis begins by identifying the loads acting on the beam. Then, the reactions at the beam's fixed end are calculated using equilibrium equations. The vertical reaction is a combination of the distributed and point loads, while the moment reaction is the sum of their moments. The shear force distribution along the beam, resulting from these loads, is established by creating...
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Bending of Members Made of Several Materials01:11

Bending of Members Made of Several Materials

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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
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Design of Prismatic Beams for Bending01:23

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466
The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
466
Deformation of a Beam under Transverse Loading01:15

Deformation of a Beam under Transverse Loading

498
Understanding beam deflection, particularly for indeterminate beams with overhanging segments and multiple concentrated loads, is crucial for ensuring structural integrity and functionality. The process begins with constructing an accurate free-body diagram, which helps identify the forces and moments acting on the beam. This diagram is vital for visualizing how bending moments vary along the beam's length, influencing its curvature.
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Deflection of a Beam01:19

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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.
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Updated: Nov 6, 2025

Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2
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4D-STEM of Beam-Sensitive Materials.

Karen C Bustillo1, Steven E Zeltmann2, Min Chen2

  • 1National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.

Accounts of Chemical Research
|May 12, 2021
PubMed
Summary
This summary is machine-generated.

Four-dimensional scanning transmission electron microscopy (4D-STEM) images beam-sensitive materials by scanning a focused electron beam and recording diffraction patterns. This technique, optimized with cryogenic cooling and controlled electron dose, reveals detailed structural information in soft matter.

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Area of Science:

  • Materials Science
  • Electron Microscopy
  • Nanotechnology

Background:

  • Soft materials are challenging to image with transmission electron microscopy due to beam damage.
  • Electron beam exposure can cause diffusion of radicals, leading to material damage and disorder.
  • Existing techniques struggle to provide high-resolution structural information for beam-sensitive samples.

Purpose of the Study:

  • To present four-dimensional scanning transmission electron microscopy (4D-STEM) as a flexible approach for imaging beam-sensitive materials.
  • To detail experimental parameters and illumination conditions for optimizing 4D-STEM.
  • To enable the elucidation of local crystal orientation, structural distortions, and crystallinity in challenging samples.

Main Methods:

  • Utilizing a converged electron beam scanned across the sample.
  • Recording a pixelated diffraction pattern at each scan position, creating a four-dimensional dataset.
  • Employing cryogenic sample cooling to minimize beam-induced damage and disorder.

Main Results:

  • Demonstrated the ability to map local crystal orientation, structural distortions, and crystallinity.
  • Successfully applied 4D-STEM to both organic and inorganic beam-sensitive materials, including crystalline, semicrystalline, mixed-phase, and amorphous samples.
  • Reconstructed orientation, degree, and domain size of π-π stacking in organic materials.

Conclusions:

  • 4D-STEM is a powerful technique for analyzing the structure of beam-sensitive materials.
  • Optimized experimental parameters, including sample cooling and electron fluence control, are crucial for minimizing beam damage.
  • This technique is accessible and valuable for materials science research, even without aberration-corrected instruments.