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Related Concept Videos

Shearing Stresses in a Beam: Problem Solving01:14

Shearing Stresses in a Beam: Problem Solving

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...
Shear on the Horizontal Face of a Beam Element01:16

Shear on the Horizontal Face of a Beam Element

To understand shear on the flat side of a prismatic beam element, consider the vertical and horizontal shearing forces, and the normal forces, acting on the element. The element's upper (U) and lower (L) sections, which are divided by the beam's neutral axis, are examined. The equilibrium of these forces is determined by applying the equilibrium equation, which helps identify the horizontal shearing force. This force is directly related to the bending moments and the cross-section's first...
Fluid Pressure over Flat Plate of Variable Width01:02

Fluid Pressure over Flat Plate of Variable Width

When a flat plate is submerged in a fluid, the fluid exerts pressure on the plate. This pressure can lead to many different phenomena, including drag and buoyancy. To understand the behavior of the fluid over a flat plate of variable width, it is essential to analyze the distribution of the pressure exerted.
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Lift01:23

Lift

Lift is a fundamental aerodynamic force that acts perpendicular to the direction of airflow. It plays a central role in achieving and sustaining flight and in stabilizing various vehicles. Lift primarily originates from pressure differences created across surfaces, such as an airfoil. A lower pressure region forms above the wing, while a higher pressure region forms below it, generating an upward force. This differential results from the shape and orientation of the airfoil, enabling the wing...
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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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Fluid Pressure over Flat Plate of Constant Width

When a body is submerged in water, it experiences fluid pressure acting normal on its surface and distributed over its area. For better design structures, it is crucial to determine the magnitude and location of the resultant force acting on the surface. In the case of a rectangular plate of constant width submerged in water, the pressure increases with depth, resulting in a linearly varying trapezoidal pressure distribution from the upper to the lower edge of the plate.
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Structural Design and Manufacturing of a Cruiser Class Solar Vehicle
14:57

Structural Design and Manufacturing of a Cruiser Class Solar Vehicle

Published on: January 30, 2019

"Light sail" acceleration reexamined.

Andrea Macchi1, Silvia Veghini, Francesco Pegoraro

  • 1CNR/INFM/polyLAB, Pisa, Italy. macchi@df.unipi.it

Physical Review Letters
|October 2, 2009
PubMed
Summary
This summary is machine-generated.

Superintense lasers accelerate ultrathin foils via radiation pressure. Optimal foil thickness results in rear-side acceleration, with the light sail model providing estimates but overestimating efficiency.

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Area of Science:

  • Plasma physics
  • Laser-matter interactions
  • High-energy-density physics

Background:

  • Radiation pressure from intense lasers can accelerate matter.
  • Understanding ultrathin foil acceleration is key for applications like inertial confinement fusion and particle acceleration.

Purpose of the Study:

  • Investigate the dynamics of ultrathin foil acceleration by circularly polarized laser radiation pressure.
  • Analyze the roles of self-induced transparency and charge separation in this process.

Main Methods:

  • Analytical modeling of laser-plasma interactions.
  • Particle-in-cell (PIC) simulations to capture complex plasma dynamics.

Main Results:

  • Identified "optimal" foil thicknesses for efficient acceleration.
  • Demonstrated that only a rear-side layer of the foil is accelerated by radiation pressure.
  • The light sail model accurately estimates energy per nucleon but overestimates laser-to-ion conversion efficiency.

Conclusions:

  • Radiation pressure acceleration of ultrathin foils is a complex process influenced by target thickness and laser polarization.
  • Self-induced transparency and charge separation are critical factors.
  • The light sail model serves as a useful approximation but requires refinement for precise efficiency predictions.