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相关概念视频

Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

Design Example: Analyzing Capacity Contours for Flood Risk Assessment

327
Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
327
Responses to Drought and Flooding02:41

Responses to Drought and Flooding

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Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
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Communication01:03

Communication

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Communication between two animals occurs when one animal transmits an information signal that causes a change in the animal that receives the information. Organisms communicate with one another in a host of different ways. Signals can be auditory, chemical, visual, tactile, or a combination of these. Communication is a critical behavioral adaptation that promotes survival, growth, and reproduction.
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Communication01:28

Communication

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Sharing information, concepts, and emotions to foster mutual understanding is communication. The sender, recipient, and transaction must be considered in this manner. The sender is the person who shares the message, the recipient is the person who receives and understands the message, and the transaction is the method used to deliver the message and the variables that affect the communication's context and surroundings. The nurse-client connection is built on therapeutic communication.
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Lung Capacity01:47

Lung Capacity

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The air in the lungs is measured in volumes and capacities. Lung volume measures reflect the amount of air taken in, released, or left over after a lung function, like a single inhalation. Lung capacity measures are sums of two or more lung volume measures.
56.4K
Introduction to Test of Independence01:21

Introduction to Test of Independence

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In statistics, the term independence means that one can directly obtain the probability of any event involving both variables by multiplying their individual probabilities. Tests of independence are chi-square tests involving the use of a contingency table of observed (data) values.
The test statistic for a test of independence is similar to that of a goodness-of-fit test:
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相关实验视频

Updated: Feb 8, 2026

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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压力独立的声波沟通与增强容量和加密信息由自由淹没的metasurfaces.

Zhiwen Ren1, Xudong He1, Hao-Wen Dong1

  • 1Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing, China.

Advanced materials (Deerfield Beach, Fla.)
|February 7, 2026
PubMed
概括

研究人员开发了一种新的水下声学通信系统,使用声学波束. 该系统增强了信息能力,并为深海数据传输提供了物理计算安全性.

关键词:
水静压的压力是水静压.metasurfaces 是一个地表.水下声波通信是水下声波通信.旋波是波浪的波浪.

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Author Spotlight: Optimizing EAS with Long Electrodes for Enhanced Cochlear Coverage and Hearing Preservation
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相关实验视频

Last Updated: Feb 8, 2026

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科学领域:

  • 声学 声学 在声学方面
  • 超材料是什么?超材料是什么?
  • 信息理论 信息理论

背景情况:

  • 结构化的束可以促进多重传输通信,但由于压力和合,在水下声学方面面临挑战.
  • 提高水下声学信息容量仅限于同轴束的被动调制.

研究的目的:

  • 在水下声波沟通中实现同时增强信息能力和混合物理计算伪装.
  • 开发一种压力独立的系统,用于安全的深海数据传输.

主要方法:

  • 利用反向设计的,自由泛滥的元表面来实现水静态稳定性和波散射.
  • 合成和解调的同轴旋转束,具有不同的拓电荷.
  • 实施了计算掩码加密方案,用于在加密文本位流中数字隐藏纯文本图像.

主要成果:

  • 实验实现了压力独立的声波沟通.
  • 通过合成的束来证明物理加密的端口到端口信息传输.
  • 通过加密文本传输确认了物理计算反窃听能力.

结论:

  • 开发的系统为高容量,安全的水下声通信提供了一种新的方法.
  • 基于metasurface的声生成和混合加密为深海数据安全铺平了道路.
  • 这项研究使得安全的水下通信技术取得了前所未有的进步.