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相关概念视频

Radiation: Applications01:17

Radiation: Applications

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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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Radiation Pressure: Problem Solving01:09

Radiation Pressure: Problem Solving

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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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Light Acquisition02:16

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In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
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Absorption of Radiation01:05

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The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
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Induced Electric Fields: Applications01:27

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An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
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The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
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An Intra-Tissue Radiometry Microprobe for Measuring Radiance In Situ in Living Tissue
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VD-NeRF:可见度意识脱的神经辐射场用于视图一致的编辑和高频再照明.

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    本研究介绍VD-NeRF,这是一种用于现实的3D场景编辑和重新照明的新方法. 它有效地将外观与几何脱,使得一致的编辑和高频重新照明能够提高可见度意识.

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    科学领域:

    • 计算机视觉 计算机视觉
    • 计算机图形 计算机图形
    • 人工智能的人工智能

    背景情况:

    • 神经辐射场 (NeRFs) 在新的视图合成方面表现出色,但由于集成的几何和外观编码,在场景操纵方面遇到了困难.
    • 现有的NeRF编辑方法经常产生视图不一致的结果,并且在建模高频照明效果方面存在局限性.
    • 在NeRF中的当前照明表示,例如球体波或低分辨率地图,对于复杂的重新照明场景是不够的.

    研究的目的:

    • 开发一种视觉意识的方法 (VD-NeRF) 来解脱3D场景中的视觉独立和视觉依赖的外观.
    • 为了在NeRF中实现一致的外观编辑和高频环境重新照明.
    • 通过整合可见性信息来提高场景分解和重新照明的质量.

    主要方法:

    • 从输入场景重建一个明确的网格,使用签名距离函数.
    • 使用脱的NeRF,使用脱的特征将视图独立的外观附加到网格中.
    • 使用混合照明表示,具有明确的可学习环境地图和隐性照明网络,进行全面的重新照明.

    主要成果:

    • 在编辑场景外观后获得了视图一致的结果.
    • 通过支持新型环境地图和隐性照明网络,实现了高频环境重新照明.
    • 通过可见度意识,证明了更好的分解和重新照明质量.
    • 在编辑和重新照明任务方面,在数量和质量上优于以前的方法.

    结论:

    • VD-NeRF成功地将场景属性脱,以提高可编辑性和重新点亮性.
    • 混合照明表示和可见度意识显著改善染和编辑结果.
    • 拟议的方法为复杂的3D场景操纵和现实的重新照明应用提供了强大的解决方案.