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相关概念视频

Generalized Hooke's Law01:22

Generalized Hooke's Law

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The generalized Hooke's Law is a broadened version of Hooke's Law, which extends to all types of stress and in every direction. Consider an isotropic material shaped into a cube subjected to multiaxial loading. In this scenario, normal stresses are exerted along the three coordinate axes. As a result of these stresses, the cubic shape deforms into a rectangular parallelepiped. Despite this deformation, the new shape maintains equal sides, and there is a normal strain in the direction of the...
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Generalized Anxiety Disorder01:30

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Generalized Anxiety Disorder (GAD) is a chronic condition characterized by excessive and uncontrollable worry that persists for at least six months, significantly interfering with daily functioning. Unlike situational anxiety, which arises in response to specific stressors, GAD often occurs without a clear cause. Individuals may experience disproportionate worry about work, health, or relationships. For instance, a person might continuously fear poor health despite normal medical evaluations or...
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Social Foundations of Self II: The Generalized Other01:20

Social Foundations of Self II: The Generalized Other

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According to George Herbert Mead, as children progress beyond the game stage, they develop a more comprehensive understanding of societal rules and norms. This cognitive and social development enables them to internalize the expectations of the broader community, refining their ability to regulate behavior.Consistent participation in organized activities is crucial in helping children recognize that their actions are not isolated but contribute to a more significant, interconnected group...
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Generalization, Discrimination, and Extinction01:24

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Generalization, discrimination, and extinction are key concepts in operant conditioning that influence how behaviors are learned and maintained.
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DC Generator01:19

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An alternator converts mechanical energy into electrical energy that varies sinusoidally, resulting in AC current. Meanwhile, a DC generator converts mechanical energy into electrical energy, which are DC pulses with the same polarity. The construction of a DC generator is similar to that of an alternator, except that the pair of slip rings is replaced by a single split ring, also called a commutator. The commutator functions like a periodic rotary switch; it changes the contacts with the...
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Bacterial generation time, the period required for a bacterial population to double during its exponential growth phase, serves as a critical measure of microbial growth dynamics under optimal conditions. This parameter varies significantly across bacterial species and can be influenced by factors such as temperature, pH, and the availability of nutrients. For example, Escherichia coli can achieve a generation time of approximately 20 minutes, while Mycobacterium tuberculosis exhibits a much...
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相关实验视频

Updated: Jan 23, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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带有元表面的矢量通用阵列生成.

Qingsong Yao1, Zile Li1,2, Guoxing Zheng3,4,5

  • 1Electronic Information School, Wuhan University, Wuhan, China.

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概括
此摘要是机器生成的。

现在可以使用达曼优化和元表面来创建复杂的3D光结构. 这种技术可以完全控制光的特性,从而实现新的光子应用.

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科学领域:

  • 光学和光子学 在光学和光子学.
  • 地表表面技术的技术.

背景情况:

  • 产生复杂的三维 (3D) 光场在光学研究中提出了重大挑战.
  • 对光的偏振,相位和角动量进行精确控制对于先进的应用至关重要.

研究的目的:

  • 开发一种创新的技术,用于创建复杂的3D光结构.
  • 为了实现对光参数的全面控制,包括极化,相位,角动量和空间模式.

主要方法:

  • 整合达曼优化算法与先进的超表面设计.
  • 利用超表面精确操纵光波前线.

主要成果:

  • 展示了一种技术,使得能够以前所未有的控制来生成3D光结构.
  • 同时成功操纵两极化,相位,角动量和空间模式.

结论:

  • 开发的技术提供了一种强大的新方法,用于生成3D通用束.
  • 这一突破有可能显著推进光子学中的应用.