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Short-distance Transport of Resources02:12

Short-distance Transport of Resources

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Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
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Network Function of a Circuit01:25

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Frequency response analysis in electrical circuits provides vital insights into a circuit's behavior as the frequency of the input signal changes. The transfer function, a mathematical tool, is instrumental in understanding this behavior. It defines the relationship between phasor output and input and comes in four types: voltage gain, current gain, transfer impedance, and transfer admittance. The critical components of the transfer function are the poles and zeros.
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In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
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Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant...
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相关实验视频

Updated: Apr 29, 2026

Quantitatively Measuring In situ Flows using a Self-Contained Underwater Velocimetry Apparatus SCUVA
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水下无线传感器网络的路由协议基于信任模型和空格避免算法.

Jun Ye1, Weili Jiang1

  • 1Key Laboratory of Internet Information Retrieval of Hainan Province, School of Cyberspace Security, Hainan University, 58 Renmin Avenue, Haikou 570228, China.

Sensors (Basel, Switzerland)
|December 17, 2024
PubMed
概括
此摘要是机器生成的。

本研究介绍了水下无线传感器网络的新路由方案. 它有效地检测恶意节点并优化数据传输,改善网络性能并减少能源消耗.

关键词:
模糊的逻辑模糊的逻辑安全传输安全的传输.信任模型信任模型水下无线传感器网络

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科学领域:

  • 海洋技术 海洋技术
  • 网络安全 网络安全
  • 传感器网络是一个传感器网络.

背景情况:

  • 水下无线传感器网络 (UWSNs) 面临诸如资源限制,通道问题和安全威胁等局限性.
  • 复杂的水下环境对可靠的数据传输和网络管理构成重大挑战.

研究的目的:

  • 为UWSNs提出一种新的路由方案,以提高安全性和效率.
  • 为应对水下环境中恶意节点和网络空隙所带来的挑战.

主要方法:

  • 开发了一个信任模型,根据直接,间接和环境信任评估节点.
  • 整合了一个Void-Avoided算法,用于对路径选择进行双跳可用性检查.
  • 优先考虑尽量减少总布线距离,能源消耗和延迟.

主要成果:

  • 拟议方案通过异常行为分析有效检测恶意节点.
  • 与现有方法相比,在恶意节点检测率方面取得了卓越的性能.
  • 在能源消耗和端到端延迟方面取得了显著的改善.

结论:

  • 集成的信任模型和Void-Avoided算法为UWSN路由提供了一个强大的解决方案.
  • 该方案提高了网络安全性,并优化了在具有挑战性的水下环境中数据传输效率.
  • 为可靠的海洋勘探和环境监测应用提供了一个有前途的方法.