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相关概念视频

Quality of Water01:19

Quality of Water

121
In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...
121
Testing Water Quality01:14

Testing Water Quality

135
When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
135
Imaging Studies II: Ultrasonography01:24

Imaging Studies II: Ultrasonography

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IntroductionUltrasonography, or renal ultrasound, is a noninvasive medical imaging technique that uses high-frequency sound waves to visualize the kidneys, ureters, bladder, and surrounding tissues.Indications for Urinary System UltrasonographyUrinary system ultrasonography is indicated in various clinical scenarios, such as:Kidney Stones (Urolithiasis): To detect and monitor the size and presence of kidney or urinary tract stones.Hydronephrosis: To assess the dilation of the renal pelvis and...
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相关实验视频

Updated: Jul 16, 2025

Reefshape: A System for the Efficient Collection and Automated Processing of Time-Series Underwater Photogrammetry Data for Benthic Habitat Monitoring
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水下图像质量评估水下图像质量评估

Xieliu Yang, Jianping Li, Wenfeng Liang

    Journal of the Optical Society of America. A, Optics, image science, and vision
    |September 14, 2023
    PubMed
    概括
    此摘要是机器生成的。

    本研究审查了用于评估图像恢复技术的水下图像质量评估 (UIQA) 方法. 它分析了数据集上的典型UIQA指标,并建议未来的研究方向,以更好地改善水下图像增强.

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    科学领域:

    • 计算机视觉 计算机视觉
    • 图像处理 图像处理

    背景情况:

    • 水下图像恢复和增强方法对于高视觉质量的成像至关重要.
    • 需要使用水下图像质量评估 (UIQA) 方法来评估这些恢复技术.

    研究的目的:

    • 综合总结主观和客观的UIQA方法,指标和数据集.
    • 分析在水下图像数据集上典型的UIQA指标的性能.

    主要方法:

    • 对主观和客观UIQA方法的文献综述.
    • 在两个不同的水下图像数据集上对UIQA指标进行实验分析.

    主要成果:

    • 提供了现有的UIQA方法的全面概述.
    • 对常见UIQA指标的性能分析提供了对其有效性的见解.

    结论:

    • 该研究提供了UIQA研究的综合观点.
    • 确定了在水下图像质量评估和增强方面的未来研究领域.