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相关概念视频

Collisions in Multiple Dimensions: Introduction01:05

Collisions in Multiple Dimensions: Introduction

4.9K
It is far more common for collisions to occur in two dimensions; that is, the initial velocity vectors are neither parallel nor antiparallel to each other. Let's see what complications arise from this. The first idea is that momentum is a vector. Like all vectors, it can be expressed as a sum of perpendicular components (usually, though not always, an x-component and a y-component, and a z-component if necessary). Thus, when the statement of conservation of momentum is written for a...
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Collisions in Multiple Dimensions: Problem Solving01:06

Collisions in Multiple Dimensions: Problem Solving

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In multiple dimensions, the conservation of momentum applies in each direction independently. Hence, to solve collisions in multiple dimensions, we should write down the momentum conservation in each direction separately. To help understand collisions in multiple dimensions, consider an example.
A small car of mass 1,200 kg traveling east at 60 km/h collides at an intersection with a truck of mass 3,000 kg traveling due north at 40 km/h. The two vehicles are locked together. What is the...
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Vector Algebra: Method of Components01:08

Vector Algebra: Method of Components

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It is cumbersome to find the magnitudes of vectors using the parallelogram rule or using the graphical method to perform mathematical operations like addition, subtraction, and multiplication. There are two ways to circumvent this algebraic complexity. One way is to draw the vectors to scale, as in navigation, and read approximate vector lengths and angles (directions) from the graphs. The other way is to use the method of components.
In many applications, the magnitudes and directions of...
13.9K
Ampere-Maxwell's Law: Problem-Solving01:17

Ampere-Maxwell's Law: Problem-Solving

613
A parallel-plate capacitor with capacitance C, whose plates have area A and separation distance d, is connected to a resistor R and a battery of voltage V. The current starts to flow at t = 0. What is the displacement current between the capacitor plates at time t? From the properties of the capacitor, what is the corresponding real current?
To solve the problem, we can use the equations from the analysis of an RC circuit and Maxwell's version of Ampère's law.
For the first part of...
613
Singularity Functions for Shear01:26

Singularity Functions for Shear

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In structural analysis, singularity functions are crucial in simplifying the representation of shear forces in beams under discontinuous loading. These functions describe discontinuous  variations in shear force across a beam with varying loads by using a single mathematical expression, regardless of the complexity of the loading conditions. The singularity functions are derived from creating a free-body diagram of the beam and then making conceptual cuts at specific points to examine the...
126

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相关实验视频

Updated: Jun 22, 2025

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

Published on: September 25, 2020

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通过芯片集成元表面的多维加密.

Shuai Wan1, Kening Qu1, Yangyang Shi1

  • 1Electronic Information School, Wuhan University, Wuhan 430072, China.

ACS nano
|July 3, 2024
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种使用芯片集成元表面的新光学加密方法. 它可以通过增强的安全功能进行安全的多维数据存储和检索.

关键词:
增强现实全息图增强现实全息图芯片集成的地表变化器.多维操纵的多维操纵纳米打印技术的使用通过光学加密进行加密.

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MPI CyberMotion Simulator: Implementation of a Novel Motion Simulator to Investigate Multisensory Path Integration in Three Dimensions
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相关实验视频

Last Updated: Jun 22, 2025

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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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科学领域:

  • 光学和光子学 在光学和光子学.
  • 信息安全 信息安全
  • 材料科学 材料科学 材料科学

背景情况:

  • 基于metasurface的光学加密在关键复杂性和多维性方面面临限制.
  • 由于解码密钥和加密能力的限制,当前的方法会对信息安全构成风险.

研究的目的:

  • 开发使用芯片集成的超表面的多维光学加密系统.
  • 通过结合同时操纵光学参数来克服现有技术的局限性.

主要方法:

  • 同时操纵波长,方向和极化,使用芯片集成的超表面.
  • 近距离和远距离的融合加密用于隐藏增强现实 (AR) 全息图.
  • 多维加密和解密过程的实验演示.

主要成果:

  • 成功隐藏了多达八个频道的AR全息图.
  • 只有使用正确的三维解码键才能实现全息图提取.
  • 在解密的全息图中显示了低交叉声,高清晰度,并且没有零级斑点噪声.

结论:

  • 拟议的芯片集成超表面战略为增强加密能力和安全提供了可行的途径.
  • 这种方法有望在防伪性能和光学加密存储方面取得进展.
  • 多维加密系统解决了数字时代信息安全的关键挑战.