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相关概念视频

Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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Understanding the behavior of diodes when forward-biased is a fundamental aspect of electronic circuit design and analysis. This analysis primarily utilizes two models: the exponential diode model and the constant-voltage-drop model. The exponential model comes into play when the source voltage exceeds 0.5 volts, pushing the diode current to rise exponentially above the saturation current. This relationship is graphically depicted in the current-voltage (I-V) curve, illustrating the diode's...
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Modeling of Diode Reverse Characteristics01:14

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In electronic circuits, reverse-biased diode configurations are critical for regulating voltage levels. Zener diodes exploit the reverse breakdown phenomenon and exhibit a controlled breakdown at a specific Zener voltage (VZ). They are designed to maintain a constant voltage across their terminals and are commonly used for voltage regulation in circuits.
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Plastic Deformations of Members with a Single Plane of Symmetry01:21

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When a structural member undergoes plastic deformation due to bending, it is crucial to understand the position of the neutral axis and the stress distribution. This member, characterized by a single plane of symmetry, exhibits a uniform stress distribution, with negative stress above the neutral axis and positive stress below. Notably, the neutral axis does not align with the centroid of the cross-section. This misalignment is typical in cases where the cross-section is not rectangular or...
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Gauss's Law: Planar Symmetry01:27

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A planar symmetry of charge density is obtained when charges are uniformly spread over a large flat surface. In planar symmetry, all points in a plane parallel to the plane of charge are identical with respect to the charges. Suppose the plane of the charge distribution is the xy-plane, and the electric field at a space point P with coordinates (x, y, z) is to be determined. Since the charge density is the same at all (x, y) - coordinates in the z = 0 plane, by symmetry, the electric field at P...
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相关实验视频

Updated: Jun 15, 2025

4D Printed Bifurcated Stents with Kirigami-Inspired Structures
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生成模型在与kirigami元材料作斗争.

Gerrit Felsch1,2, Viacheslav Slesarenko3,4

  • 1Cluster of Excellence livMatS @ FIT - Freiburg Center for Interactive Materials and Bioinspired Technologies, 79110, Freiburg, Germany.

Scientific reports
|August 21, 2024
PubMed
概括
此摘要是机器生成的。

对超材料的生成模型可能会因为生存偏差而夸大成功. 对于kirigami,相似度的限制阻碍了像VAE和GAN这样的流行模型的有效性.

关键词:
生成型模型是一种生成型模型.反向设计是一种反向设计.基里加米 (Kirigami) 是一个城市.机器学习 机器学习机械超材料 机械超材料

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科学领域:

  • 材料科学 材料科学 材料科学
  • 机器学习 机器学习
  • 计算设计的计算设计.

背景情况:

  • 生成型机器学习模型擅长设计具有目标属性的元材料.
  • 超材料的行为取决于它们的内部结构,使设计复杂.
  • 基里加米超材料引入了由于相互依存的切割而导致的设计限制.

研究的目的:

  • 调查元材料的生成模型中的潜在生存偏差.
  • 评估kirigami结构上领先的生成模型的性能.
  • 确定当前生成模型在创建多样化的kirigami超材料方面的局限性.

主要方法:

  • 评估了四种流行的生成模型:变化自编码器 (VAE),生成对立网络 (GAN),瓦瑟斯坦GAN (WGAN) 和否定扩散概率模型 (DDPM).
  • 专注于生成kirigami结构,限制切割交叉点.
  • 分析了相似度测量的适用性,特别是欧几里德距离,对于kirigami几何.

主要成果:

  • 在元材料设计中,生成模型的成功感受可能受到生存偏差的影响.
  • 禁止在kirigami中切割交叉点使相似度量识别复杂化.
  • VAE和WGAN模型受到重大影响,因为它们依赖于欧几里德距离,这不适合基里加米几何.

结论:

  • 当前的生成模型在应用于kirigami元材料时面临重大局限性.
  • 像VAE和WGAN这样的模型的有效性受到不适合复杂几何形状的相似度指标的损害.
  • 需要进行进一步的研究,以开发针对各种kirigami元材料设计的强大的生成方法.