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Related Concept Videos

Beams01:30

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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.
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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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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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Prismatic Beams: Problem Solving01:15

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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.
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Principal Stresses in a Beam01:11

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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.
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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.
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A Method to Study the C924T Polymorphism of the Thromboxane A2 Receptor Gene
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Vector polymorphic beam.

José A Rodrigo1, Tatiana Alieva2

  • 1Universidad Complutense de Madrid, Facultad de Ciencias Físicas, Ciudad Universitaria s/n, Madrid, 28040, Spain. jarmar@fis.ucm.es.

Scientific Reports
|May 18, 2018
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Summary
This summary is machine-generated.

Researchers developed a vector polymorphic beam for precise control over light intensity, phase, and polarization. This innovation enables advanced optical manipulation and laser micromachining with reconfigurable 3D particle trajectories.

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Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Nanotechnology

Background:

  • Scalar polymorphic beams offer independent control of intensity and phase for laser traps.
  • Existing methods are limited in controlling light polarization along arbitrary curves.

Purpose of the Study:

  • To introduce and experimentally validate the vector polymorphic beam.
  • To demonstrate independent control of light polarization along arbitrary curves.

Main Methods:

  • Design of a vector polymorphic beam with a simple closed-form expression.
  • Generation of the beam using a computer-generated hologram.
  • Experimental validation of polarization shaping tangential and orthogonal to the curve.

Main Results:

  • Successful demonstration of independent polarization control along arbitrary laser curves.
  • Achieved polarization shaping tangential and orthogonal to the curve.
  • The vector polymorphic beam is easily generated via computer-generated holography.

Conclusions:

  • The vector polymorphic beam represents a significant advancement in optical beam shaping.
  • This technology enhances capabilities in optical manipulation and laser micromachining.
  • Enables precise control of micro/nano-particle manipulation along complex 3D trajectories.