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相关概念视频

Prismatic Beams: Problem Solving01:15

Prismatic Beams: Problem Solving

208
In the design of a supported timber beam subjected to a distributed load, both the beam's physical dimensions and the timber's characteristics, such as its grade and species, are critical. These factors determine the allowable stress values, which are crucial for calculating the necessary beam depth to ensure structural integrity and safety.
The design begins with analyzing the beam as a free body to identify moments and force balances, thereby determining support reactions. Next, the...
208
Deflection of a Beam01:19

Deflection of a Beam

383
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.
Singularity functions, described in an earlier lesson, are powerful mathematical tools that represent discontinuities within a function commonly encountered in structural loading...
383
Design of Prismatic Beams for Bending01:23

Design of Prismatic Beams for Bending

379
The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
379

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相关实验视频

Updated: Sep 17, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
09:33

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Published on: June 7, 2019

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是可配置的编码声学元表面,用于多功能光束操纵.

Hu Jie1, Zhou Hao2, Jiang Mengqi2

  • 1College of information science and technology & College of artificial intelligence, Nanjing Forestry University, Nanjing, P.R. China. hujie@njfu.edu.cn.

Scientific reports
|July 2, 2025
PubMed
概括

本研究介绍了一种可重新配置的编码声学元表面,采用紧的低波长单位电池,用于动态声学波面成型. 该设计提供了广泛的操作带和简单的重新配置,使声学成像和通信中的应用成为可能.

关键词:
声学聚焦 声学聚焦声学超材料是一种声学超材料.梁分裂 梁分裂 梁分裂编码元地表的代码.可重新配置的可重新配置.

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相关实验视频

Last Updated: Sep 17, 2025

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科学领域:

  • 声学 声学 在声学方面
  • 材料科学 材料科学 材料科学
  • 波浪工程 波浪工程

背景情况:

  • 可重新配置的超表面为声波提供了先进的控制.
  • 在实现亚波长厚度,宽带宽和设计简单性方面仍然存在挑战.

研究的目的:

  • 理论设计和实验实现一个可重新配置的编码声学元表面.
  • 为了实现动态的波面成型,采用紧的,低波长和广泛的操作频段设计.

主要方法:

  • 紧的单元电池的设计,具有可启用二进制编码 (0和1) 的卷轴配置.
  • 使用单个结构参数变化进行重新配置.
  • 理论设计,数值模拟和实验验证.

主要成果:

  • 展示了一个可重新配置的编码声学元表面,具有深次波长尺度 (H=18毫米) 的单元细胞.
  • 在广的频率范围 (1.7-2.5 kHz) 中实现了动态波面成型.
  • 通过光束分割和声学聚焦进行验证的性能,模拟和测量结果之间有很好的一致性.

结论:

  • 设计的超表面高效灵活地根据所需的模式操纵声波前线.
  • 该设计在易于制造,超薄厚度和宽带宽方面具有优势.
  • 为新的声学功能设备和声学成像和通信中的应用打开了道路.