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相关概念视频

Unsoundness of Aggregate due to Volume Change01:26

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Unsoundness in aggregates due to volume changes is primarily caused by the physical alterations aggregates undergo, such as freezing and thawing, thermal changes, and wetting and drying. Unsound aggregates, when subjected to these changes, result in volume change upon disintegration. This, in turn, contributes to the deterioration of concrete, including scaling, pop-outs, and cracking. Particular types of aggregates, such as porous flints, cherts, and those containing clay minerals, are...
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On many occasions, physicists, other scientists, and engineers need to make estimates of a particular quantity. These are sometimes referred to as guesstimates, order-of-magnitude approximations, back-of-the-envelope calculations, or Fermi calculations. The physicist Enrico Fermi was famous for his ability to estimate various kinds of data with surprising precision. Estimating does not mean guessing a number or a formula at random. Instead, estimation means using prior experience and sound...
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The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
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Sampling Methods: Overview01:06

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A sample refers to a smaller subset representative of a larger population. In analytical chemistry, studying or analyzing an entire population is often impractical or impossible. Therefore, samples are used to draw inferences and generalize the whole population. The sampling method selects individuals or items from a population to create a sample. Standard sampling methods include random, judgemental, systematic, stratified, and cluster sampling. 
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Air content measurement in concrete is critical for ensuring structural integrity and durability of concrete structures, especially in environments prone to severe weather conditions. Accurate air content analysis optimizes concrete's resistance to freeze-thaw cycles and enhances its workability and strength. Several methods are standardized under ASTM guidelines to measure the air content in fresh concrete, each suitable for different concrete types and conditions.
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一个基于声音的无效体积估计算法的验证.

Gyoohwan Jung1, Hoyoung Ryu2, Jeong Woo Lee3

  • 1Department of Urology, Hanyang University College of Medicine, 222, Wangsimni-ro, Seongdong-gu, Seoul, Korea.

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概括

一个新的基于声音的算法准确地估计了排尿量,为传统排尿日记提供了方便和精确的替代方案. 这种经过验证的方法支持改善尿路健康监测.

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科学领域:

  • 生物医学工程 生物医学工程
  • 泌尿器科 泌尿器科 泌尿器科 泌尿器科
  • 声学信号处理 声学信号处理

背景情况:

  • 传统的排泄日记用于尿路健康监测,由于手动记录的不准确性和不便.
  • 基于声音的空空体积估计算法为这些局限性提供了潜在的解决方案.

研究的目的:

  • 通过使用体重变化作为参考来验证基于声音的空化体积估计算法 (proudP).
  • 为了评估算法的性能在一个大的,多个网站的人口.

主要方法:

  • 收集了来自美国和韩国的508名受试者的584个数据点,将排尿声音数据与排尿后的体重变化相匹配.
  • 采用五倍交叉验证来评估算法的准确性.
  • 利用皮尔森的相关系数,配对的t测试和布兰德-阿尔特曼图表进行统计分析.

主要成果:

  • 算法估计的平均空化体积为202.6毫升 (SD: ±114.8),与平均体重变化为208.0g (SD: ±121.5) 保持一致.
  • 在估计和测量体积之间观察到强烈的线性相关性 (皮尔森r = 0.92,p < 0.001).
  • 配对的t测试显示在10毫升的范围内具有相当性,而布兰德-阿尔特曼分析显示平均差异为-5.5毫升.

结论:

  • 基于声音的空调音量估计算法表现出高性能和准确性.
  • 经过验证的算法为监测尿路健康提供了一个方便和可靠的工具.
  • 结果支持该算法在多个地点的临床试验中适用于不同人群.