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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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Testing Water Quality01:14

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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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Design Example: Maintaining Level of an Embankment01:19

Design Example: Maintaining Level of an Embankment

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Constructing a roadway embankment over uneven terrain requires precise leveling to ensure stability and proper drainage. Surveyors use a leveling instrument and staff to calculate ground elevations and determine the required fill material at each point along the embankment alignment.The process begins by positioning a leveling instrument near a benchmark with a known elevation. A backsight reading establishes the instrument height, which serves as a reference for subsequent measurements. A...
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Pre-Procedural Guidelines for Assessing Blood Pressure01:10

Pre-Procedural Guidelines for Assessing Blood Pressure

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Accurate blood pressure assessment is crucial for diagnosing and managing various health conditions. To ensure the reliability of these measurements, healthcare professionals must adhere to standardized pre-procedural guidelines. These guidelines enhance patient safety and improve the overall quality of healthcare. The following steps are essential for obtaining accurate and consistent blood pressure readings, from using the appropriate tools to ensuring effective communication with the...
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Quality Control01:05

Quality Control

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Quality control is one of the three cyclical quality assurance activities that help keep a system under statistical control. Typical quality control activities include creating quality control charts, conducting proficiency testing, and documenting and archiving results.
Quality control helps track data, visualize trends, and identify variations, making it easier to detect deviations that may affect the accuracy of an analysis. One way to do this is by generating a quality control chart, which...
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Quality Assurance01:19

Quality Assurance

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Quality assurance is the overarching term used to describe the activities employed to ensure the proper performance of a system. These activities can be classified into three categories: quality control, quality assessment, and internal corrective measures. Typically, these activities work cyclically: quality control is performed before and during the analysis, while quality assessment occurs during and after the investigation. Internal corrective measures are implemented based on the findings...
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Has Water Quality Improved or Been Maintained? A Quantitative Assessment Procedure.

Graham B McBride

    Journal of Environmental Quality
    |April 6, 2019
    PubMed
    Summary

    A new trend direction assessment (TDA) method provides a better way to evaluate water quality trends. This approach calculates probabilities of increasing or decreasing trends, offering clearer interpretations than traditional statistical significance testing.

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    Area of Science:

    • Environmental Science
    • Statistical Modeling
    • Ecology

    Background:

    • Water quality trend reporting is crucial for policy-making.
    • Traditional methods often misinterpret non-significant results, masking concerning trends.
    • Statistical significance is sensitive to sample size, potentially obscuring real trends.

    Purpose of the Study:

    • To introduce a novel Trend Direction Assessment (TDA) procedure for evaluating environmental data trends.
    • To offer a more robust alternative to traditional hypothesis testing for trend analysis.
    • To provide a framework for assessing if environmental quality has been maintained.

    Main Methods:

    • The TDA procedure adapts a psychological formulation for comparing population means, focusing on error risks.
    • It calculates probabilities of increasing or decreasing trends, avoiding traditional hypothesis testing.
    • Probabilities are mapped to qualitative descriptors (e.g., 'extremely likely') for trend interpretation.

    Main Results:

    • The TDA procedure effectively categorizes trends using probability breakpoints, avoiding the 'not statistically significant' outcome.
    • It requires no additional data beyond traditional methods, reinterpreting significance levels as error rates.
    • Demonstrated applicability to both small and large datasets for water quality trend analysis.

    Conclusions:

    • The TDA procedure offers a more interpretable and reliable method for assessing environmental trends, particularly water quality.
    • It provides a graduated scale for trend description, enhancing communication of findings.
    • The framework can be extended to evaluate environmental quality maintenance, incorporating trend magnitude.