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Related Concept Videos

Quality of Water01:19

Quality of Water

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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...
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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...
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Imaging Studies II: Ultrasonography01:24

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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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Related Experiment Video

Updated: Jul 16, 2025

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Underwater image quality assessment.

Xieliu Yang, Jianping Li, Wenfeng Liang

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |September 14, 2023
    PubMed
    Summary
    This summary is machine-generated.

    This study reviews underwater image quality assessment (UIQA) methods for evaluating image restoration techniques. It analyzes typical UIQA metrics on datasets and suggests future research directions for better underwater image enhancement.

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    Area of Science:

    • Computer Vision
    • Image Processing

    Background:

    • Underwater image restoration and enhancement methods are crucial for high-visual-quality imaging.
    • Underwater Image Quality Assessment (UIQA) methods are needed to evaluate these restoration techniques.

    Purpose of the Study:

    • To comprehensively summarize subjective and objective UIQA methods, metrics, and datasets.
    • To analyze the performance of typical UIQA metrics on underwater image datasets.

    Main Methods:

    • Literature review of subjective and objective UIQA methods.
    • Experimental analysis of UIQA metrics on two distinct underwater image datasets.

    Main Results:

    • A comprehensive overview of existing UIQA methodologies is presented.
    • Performance analysis of common UIQA metrics provides insights into their effectiveness.

    Conclusions:

    • The study provides a consolidated view of UIQA research.
    • Identifies areas for future research in underwater image quality assessment and enhancement.