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Buoyancy and Stability for Submerged and Floating Bodies01:11

Buoyancy and Stability for Submerged and Floating Bodies

1.8K
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...
1.8K
Uniform Depth Channel Flow: Problem Solving01:18

Uniform Depth Channel Flow: Problem Solving

70
To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
70
Mesh Analysis for AC Circuits01:12

Mesh Analysis for AC Circuits

380
In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
380
Multicompartment Models: Overview01:14

Multicompartment Models: Overview

151
Multicompartment models are mathematical constructs that depict how drugs are distributed and eliminated within the body. They segment the body into several compartments, symbolizing various physiological or anatomical areas connected through drug transfer processes such as absorption, metabolism, distribution, and elimination.
These models offer a more comprehensive representation of drug behavior in the body than one-compartment models. They accommodate the complexity of drug distribution,...
151
Transmission Line Design Considerations01:23

Transmission Line Design Considerations

140
Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
140
Uniform Depth Channel Flow01:27

Uniform Depth Channel Flow

78
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 cross-section...
78

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相关实验视频

Updated: Jul 12, 2025

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

9.9K

为水下MIMO OCC系统开发一个全面的模型.

Ehsan Hamidnejad, Asghar Gholami

    Optics express
    |October 20, 2023
    PubMed
    概括

    光学摄像头通信 (OCC) 使用多输入多输出 (MIMO) 来提高数据速率. 这项研究模拟了水下OCC (UOCC),并展示了LED间距如何影响像素间干扰 (IPI),改善信号与干扰加噪声比 (SINR).

    科学领域:

    • 光学无线通信的无线通信
    • 水下光学通信系统
    • 信号处理 信号处理

    背景情况:

    • 光学摄像头通信 (OCC) 提供空间调制,但由于摄像头的率,其数据速率较低.
    • 采用多输入多输出 (MIMO) 技术来提高OCC数据速率.
    • 像素间干扰 (IPI) 是基于MIMO的OCC系统的一个重大挑战,影响图像传感器性能.

    研究的目的:

    • 为水下光学摄像机通信 (UOCC) 系统开发一个全面的模型.
    • 实验性地研究互像素干扰 (IPI) 对UOCC性能的影响.
    • 在UOCC中分析LED间距,LED直径和信号与干扰比 (SIR) 之间的关系.

    主要方法:

    • 开发一个UOCC系统模型.
    • 在IPI条件下对UOCC模型性能进行实验验证.
    • 信号与干扰加噪声比率 (SINR) 和信号与干扰比率 (SIR) 的比较分析.

    主要成果:

    • 沿海水路 (1-6米) 的信号与干扰比率 (SIR) 增加约为2.5dB.
    • 港口水道 (0.4-1.4米) 显示SIR增益从~2dB增加到~5dB,当LED间距为2D相比0.5D时.
    • 该研究量化了通过优化UOCC系统中的LED间距来实现的性能增长.

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    Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

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    Measuring the Structure, Composition, and Change of Underwater Environments with Large-area Imaging
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    Measuring the Structure, Composition, and Change of Underwater Environments with Large-area Imaging

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    相关实验视频

    Last Updated: Jul 12, 2025

    Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
    09:43

    Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

    Published on: March 20, 2017

    9.9K
    Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements
    09:36

    Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

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    Measuring the Structure, Composition, and Change of Underwater Environments with Large-area Imaging
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    Measuring the Structure, Composition, and Change of Underwater Environments with Large-area Imaging

    Published on: April 18, 2025

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    结论:

    • 拟议的UOCC模型准确地代表了IPI下的系统性能.
    • 优化LED相对于其直径之间的距离对于减轻IPI和增强UOCC中的SIR至关重要.
    • 这项研究为设计强大高效的水下光通信系统提供了宝贵的见解.