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Related Concept Videos

Beams01:30

Beams

1.8K
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...
1.8K
Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

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DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
323
Deflection of a Beam01:19

Deflection of a Beam

696
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...
696
Imaging Studies II: Positron Emission Tomography and Scintigraphy01:25

Imaging Studies II: Positron Emission Tomography and Scintigraphy

533
Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
Fundamental Principles of PET
533
Prismatic Beams: Problem Solving01:15

Prismatic Beams: Problem Solving

448
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...
448
Principal Stresses in a Beam01:11

Principal Stresses in a Beam

696
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...
696

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Related Experiment Video

Updated: Jan 25, 2026

Dynamic Pore-scale Reservoir-condition Imaging of Reaction in Carbonates Using Synchrotron Fast Tomography
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Two-photon Bessel beam tomography for fast volume imaging.

Andres Flores Valle, Johannes D Seelig

    Optics Express
    |May 5, 2019
    PubMed
    Summary

    This study introduces a novel tomography approach for fluorescence microscopy, enabling rapid 3D imaging of dynamic biological samples. The method captures entire volumes in a single scan, significantly advancing neural activity research.

    Area of Science:

    • Microscopy
    • Biophysics
    • Neuroscience

    Background:

    • Dynamic biological samples, such as neural activity, require high-speed 3D imaging over large volumes.
    • Current light microscopy techniques face limitations in achieving both speed and volumetric coverage.

    Purpose of the Study:

    • To develop a fast, volumetric imaging method for dynamic samples using scanning fluorescence microscopy.
    • To enable high-throughput imaging of neural activity and other biological processes.

    Main Methods:

    • A novel tomography approach for scanning fluorescence microscopy was developed.
    • Four independent projections were simultaneously recorded using temporally multiplexed, tilted Bessel beams.
    • Three-dimensional images were reconstructed using inverse Radon transforms and convolutional neural networks (U-net).

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    Preparing Lamellae from Vitreous Biological Samples Using a Dual-Beam Scanning Electron Microscope for Cryo-Electron Tomography
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    Main Results:

    • The developed method allows recording a volume image in a single frame scan.
    • This approach enables simultaneous recording of multiple projections for 3D reconstruction.
    • Successful reconstruction of 3D images from projection data was achieved.

    Conclusions:

    • The developed tomography approach significantly enhances the speed of volumetric imaging in fluorescence microscopy.
    • This technique is suitable for imaging dynamic biological processes, including neural activity.
    • The combination of Bessel beams and U-net reconstruction offers a powerful tool for 3D biological imaging.