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Related Concept Videos

Maxwell-Boltzmann Distribution: Problem Solving01:20

Maxwell-Boltzmann Distribution: Problem Solving

Individual molecules in a gas move in random directions, but a gas containing numerous molecules has a predictable distribution of molecular speeds, which is known as the Maxwell-Boltzmann distribution, f(v).
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Uniform Depth Channel Flow01:27

Uniform Depth Channel Flow

Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...
Uniform Depth Channel Flow: Problem Solving01:18

Uniform Depth Channel Flow: Problem Solving

To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
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Radiation: Applications

The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
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Unsoundness of Aggregate due to Volume Change01:26

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Unsoundness in aggregates due to volume changes is primarily caused by the physical alterations aggregates undergo, such as freezing and thawing, thermal changes, and wetting and drying. Unsound aggregates, when subjected to these changes, result in volume change upon disintegration. This, in turn, contributes to the deterioration of concrete, including scaling, pop-outs, and cracking. Particular types of aggregates, such as porous flints, cherts, and those containing clay minerals, are...
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Radiation Pressure: Problem Solving

The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
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Related Experiment Video

Updated: May 28, 2026

Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics
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Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics

Published on: October 27, 2017

Extinction-based shading and illumination in GPU volume ray-casting.

Philipp Schlegel1, Maxim Makhinya, Renato Pajarola

  • 1Visualization and MultiMedia Lab, Department of Informatics, University of Zürich, Switzerland. schlegel@ifi.uzh.ch

IEEE Transactions on Visualization and Computer Graphics
|October 29, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces advanced illumination for direct volume rendering using GPU ray-casting. The method achieves high frame rates with realistic lighting effects like soft shadows and ambient occlusion.

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Large Volume, Behaviorally-relevant Illumination for Optogenetics in Non-human Primates
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Related Experiment Videos

Last Updated: May 28, 2026

Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics
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Published on: October 27, 2017

Large Volume, Behaviorally-relevant Illumination for Optogenetics in Non-human Primates
08:32

Large Volume, Behaviorally-relevant Illumination for Optogenetics in Non-human Primates

Published on: October 3, 2017

Area of Science:

  • Computer Graphics
  • Scientific Visualization

Background:

  • Direct volume rendering (DVR) is widely used for volumetric data visualization.
  • Achieving sophisticated illumination in DVR at interactive frame rates remains a significant challenge.

Purpose of the Study:

  • To present a novel approach for advanced illumination in direct volume rendering.
  • To enable realistic lighting effects while maintaining interactive performance.

Main Methods:

  • Utilizes GPU ray-casting for direct volume rendering.
  • Exploits the summation property of the discretized volume rendering integral for lighting effects.
  • Implements directional soft shadows, ambient occlusion, and color bleeding.

Main Results:

  • Achieves very competitive frame rates with advanced illumination.
  • Fully supports multiple dynamic lights and interactive transfer function changes.
  • Demonstrates a novel implementation of volume lighting effects on the GPU.

Conclusions:

  • The proposed GPU ray-casting approach effectively integrates advanced illumination into direct volume rendering.
  • This method overcomes previous limitations by leveraging the integral nature of volume rendering for realistic lighting.
  • Enables interactive visualization of complex volumetric data with sophisticated lighting.