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相关概念视频

Uncertainty in Measurement: Reading Instruments02:46

Uncertainty in Measurement: Reading Instruments

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Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process. Such measurements result in exact numbers. By counting the eggs in a carton, for instance, one can determine exactly how many eggs are there in the carton. Similarly, the numbers of defined quantities are also exact. For example, 1 foot is exactly 12 inches, 1 inch is exactly 2.54 centimeters, and 1 gram is exactly 0.001 kilograms. Quantities...
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Uncertainty in Measurement: Accuracy and Precision03:37

Uncertainty in Measurement: Accuracy and Precision

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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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Uncertainty: Confidence Intervals00:54

Uncertainty: Confidence Intervals

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The confidence interval is the range of values around the mean that contains the true mean. It is expressed as a probability percentage. The interpretation of a 95% confidence interval, for instance, is that the statistician is 95% confident that the true mean falls within the interval. The upper and lower limits of this range are known as confidence limits. The confidence limits for the true mean are estimated from the sample's mean, the standard deviation, and the statistical factor...
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Propagation of Uncertainty from Systematic Error01:10

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The atomic mass of an element varies due to the relative ratio of its isotopes. A sample's relative proportion of oxygen isotopes influences its average atomic mass. For instance, if we were to measure the atomic mass of oxygen from a sample, the mass would be a weighted average of the isotopic masses of oxygen in that sample. Since a single sample is not likely to perfectly reflect the true atomic mass of oxygen for all the molecules of oxygen on Earth, the mass we obtain from this...
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Uncertainty: Overview00:59

Uncertainty: Overview

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In analytical chemistry, we often perform repetitive measurements to detect and minimize inaccuracies caused by both determinate and indeterminate errors. Despite the cares we take, the presence of random errors means that repeated measurements almost never have exactly the same magnitude. The collective difference between these measurements - observed values - and the estimated or expected value is called uncertainty. Uncertainty is conventionally written after the estimated or expected value.
526
Propagation of Uncertainty from Random Error00:59

Propagation of Uncertainty from Random Error

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An experiment often consists of more than a single step. In this case, measurements at each step give rise to uncertainty. Because the measurements occur in successive steps, the uncertainty in one step necessarily contributes to that in the subsequent step. As we perform statistical analysis on these types of experiments, we must learn to account for the propagation of uncertainty from one step to the next. The propagation of uncertainty depends on the type of arithmetic operation performed on...
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相关实验视频

Updated: Jun 9, 2025

The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe
08:53

The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe

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负载反响室的基于相关性的不确定性.

Maria G Becker1, Michael Frey2, Sarah Streett3

  • 1National Institute of Standards and Technology, Boulder, CO 80305 USA. She is now with the Hastings College, Hastings, NB 68901 USA.

IEEE transactions on electromagnetic compatibility
|October 24, 2024
PubMed
概括
此摘要是机器生成的。

在反响室中优化动序列可以减少调制信号测量的不确定性. 一个新的相关模型准确地预测不确定性,使用户能够找到最佳的序列,以提高测量可靠性.

关键词:
相对应关系 相对应关系电磁测量 电磁测量 电磁测量进入的过程中,测量相关性 测量相关性测量效率的测量效率是什么测量不确定性 测量不确定性这是一个反响室.无线系统无线系统.

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相关实验视频

Last Updated: Jun 9, 2025

The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe
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The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe

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Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
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科学领域:

  • 电磁学和波浪传播
  • 测量科学和计量学测量科学和计量学

背景情况:

  • 反响室对于电磁兼容性 (EMC) 测试至关重要.
  • 增强连贯带宽的加载室可以减少空间统一性,增加测量不确定性.

研究的目的:

  • 调查在负载的反响室中减轻不确定性的方法.
  • 开发一个预测模型,用于从序列中产生的不确定性.
  • 为了确定最佳的动序列,以尽量减少测量不确定性.

主要方法:

  • 开发一种新的模式调样本相关性模型.
  • 使用开发的模型和经验方法分析不确定性.
  • 在三个不同的反响室中,在四个装载箱中进行演示.
  • 探索测量和不确定性之间的关系.

主要成果:

  • 新的模式调样本相关性模型显示与经验不确定性分析的一致性在2.5%以内.
  • 对于特定的室内设置,可以确定最佳动序列.
  • 最大化的测量与最小化的不确定性相对应.

结论:

  • 适当的动序列,结合诸如和天线平台动之类的机制,有效地减少负载的反响室中的不确定性.
  • 开发的模型提供了对不确定性来源的洞察力,并使序列的优化成为可能.
  • 这种方法提高了反响室调制信号测量的可靠性.