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相关概念视频

Calibration Curves: Linear Least Squares01:20

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A calibration curve is a plot of the instrument's response against a series of known concentrations of a substance. This curve is used to set the instrument response levels, using the substance and its concentrations as standards. Alternatively, or additionally, an equation is fitted to the calibration curve plot and subsequently used to calculate the unknown concentrations of other samples reliably.
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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value.  Highly accurate...
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Accuracy, limits, and approximation01:28

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Accuracy, limits, and approximations are common in many fields, especially in engineering calculations. These concepts are imperative for ensuring that a given value is as close as possible to its true value.
Accuracy is defined as the closeness of the measured value to the true or actual value. In engineering mechanics, repeated measurements are taken during theoretical or experimental analyses to ensure that the result is precise and accurate.
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Uncertainty in Measurement: Accuracy and Precision03:37

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Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value. 
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Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
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相关实验视频

Updated: Jun 8, 2025

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator
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基于机器学习的优化摄像度 JRC 的精度.

Qinzheng Yang1, Ang Li2, Yipeng Liu3

  • 1School of Highway, Chang'an University, Xi'an, 710064, People's Republic of China.

Scientific reports
|November 4, 2024
PubMed
概括

这项研究通过开发优化模型,通过使用光度计来增强联合粗度系数 (JRC) 估计. 这些模型利用地面采样距离 (GSD) 和点密度来显著提高准确性.

关键词:
3D重建重建的3D重建共同研究中心优化优化关节粗度系数 关节粗度系数这是一种摄影计量技术 (photogrammetry).

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科学领域:

  • 地质技术工程 地质技术工程
  • 这是一种摄影计量技术 (photogrammetry).
  • 岩石力学 岩石力学 岩石力学

背景情况:

  • 准确估计联合粗度系数 (JRC) 对岩石力学和地质工程至关重要.
  • 传统的JRC估计方法可能是主观的,耗时的.
  • 摄影计量为JRC客观和高效的评估提供了潜力.

研究的目的:

  • 开发和验证优化模型,以提高光度测量关节粗度系数 (JRC) 估计的准确性.
  • 调查地面样本距离 (GSD) 和点密度对JRC估计准确性的影响.
  • 建立一个可靠的光度计方法用于JRC的评估.

主要方法:

  • 开发了一种自动空间设备定位的算法,使用运动结构和多视图立体声 (SfM-MVS) 原则以及拍摄参数选择算法 (SPSA).
  • 设计了一个带有地面控制点和检查点的便携式定位板,加上SPSA引导的移动摄像头捕捉策略.
  • 在岩石样本上进行了光度测量实验,收集了48个数据集,并分析了GSD,点密度,RMSE和JRC指标之间的相关性.

主要成果:

  • 建立了一个数据集,将GSD,点密度,RMSE和JRC估计指标联系起来,揭示了关键的相关性和敏感性.
  • 利用七个机器学习算法来开发光度计 JRC 精度优化模型.
  • 在使用线性多维回归和高斯过程回归模型的JRC准确度中,平均提高了85.73%.

结论:

  • 拟议的优化模型显著提高了光度计 JRC 估计的准确性.
  • 该研究证明了将SPSA,便携式定位板和高级机器学习集成到JRC评估中的有效性.
  • 开发的方法提供了一种更客观,更准确的方法来评估现场的岩石关节粗度.