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Related Concept Videos

Beams01:30

Beams

1.9K
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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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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Atomic Structure01:33

Atomic Structure

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Overview
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Proton (¹H) NMR: Chemical Shift01:07

Proton (¹H) NMR: Chemical Shift

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Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal.
Absorption signals of all the protium nuclei...
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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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Related Experiment Video

Updated: Feb 1, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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All-optical structuring of laser-driven proton beam profiles.

Lieselotte Obst-Huebl1,2, Tim Ziegler3,4, Florian-Emanuel Brack3,4

  • 1Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiation Physics, Bautzner Landstr. 400, 01328, Dresden, Germany. l.obst-huebl@hzdr.de.

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|December 15, 2018
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Researchers developed an all-optical method to control MeV proton beam profiles by imprinting laser pulse structures onto proton bunches. This technique utilizes quasi-static electric fields for precise proton beam manipulation.

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Related Experiment Videos

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Area of Science:

  • Plasma Physics
  • Laser-driven particle acceleration
  • Beam dynamics

Background:

  • Relativistic laser-matter interactions with thin targets generate MeV proton beams.
  • Controlling the spatial profile of these proton beams is a significant challenge.

Purpose of the Study:

  • To present a novel all-optical approach for imprinting spatial information from a laser pulse onto a proton bunch.
  • To enable direct control over the proton beam profile.

Main Methods:

  • Experiments involving relativistic laser interactions with limited-size thin solid targets.
  • Analysis of the spatial structure of the resulting energetic proton bunches.
  • Investigation of the role of quasi-static electric fields formed by residual gas ionization.

Main Results:

  • The spatial profile of the proton bunch was found to mirror the structure of the laser pulse fraction that bypassed the target.
  • Demonstrated a mechanism for information transfer from the laser to the proton bunch via laser-induced electric fields.
  • Showcased the potential for programmable proton beam shaping.

Conclusions:

  • An accessible all-optical method for controlling MeV proton beam profiles has been demonstrated.
  • Quasi-static electric fields act as a programmable memory for precise proton beam manipulation.
  • This technique opens new avenues for advanced applications in compact accelerators.