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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
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A survey team is tasked with determining the elevation difference between points Point A and Point B, separated by uneven terrain. They use a leveling instrument and a leveling rod.Common MistakesMisreading the Rod: During a backsight reading at Point A, the instrumentman observes the rod partially obscured by tall grass. Instead of reading 1.135 m, they mistakenly record 1.735 m due to the misalignment of the crosshair with the wrong graduation. This error adds 0.600 m to all subsequent...
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相关实验视频

Updated: Jan 12, 2026

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在土壤光谱学中减轻来自白色参考退化的光谱误差.

Simon Ian Futerman1, Rachel Lugassi1, Jonti Evan Shepherd2

  • 1Remote Sensing Laboratory, Porter School of the Environment and Earth Sciences, Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 699780, Israel.

Applied spectroscopy
|November 3, 2025
PubMed
概括
此摘要是机器生成的。

内部土壤标准 (ISS) 有效地纠正了土壤反射光谱中的白色参考 (WR) 面板污染引起的光谱数据不一致. 这提高了实验室内的数据可靠性,并支持协调努力.

关键词:
国际空间站 (ISS) 是一个空间站.土壤光谱学 土壤光谱学在 WR WR 里面.数据统一和数据协调.内部土壤标准 内部土壤标准系统性错误是系统性的错误.这是一个白色的参考文献.

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科学领域:

  • 土壤科学 土壤科学
  • 频谱学是一种光谱学.
  • 分析化学是一种分析化学.

背景情况:

  • 土壤反射光谱能够快速,非破坏性地评估土壤属性.
  • 白色参考 (WR) 面板的污染或恶化会导致光谱差异,阻碍数据协调.

研究的目的:

  • 调查WR面板污染对土壤光谱测量的影响.
  • 评估内部土壤标准 (ISS) 对纠正光谱差异的有效性.

主要方法:

  • 用与干净和受污染的WR面板校准的接触探头设置测量了土壤样本.
  • 使用内部土壤标准 (ISS) 根据IEEE P4005协议纠正光谱数据.
  • 用修改的平均光谱差异稳定性 (mASDS) 测量方法量化了光谱不一致性.

主要成果:

  • 国际空间站的校正显著减少了光谱不一致,特别是在可见 (Vis) 区域.
  • ISS有效地协调了在不同的WR条件下获得的频谱,降低了mASDS.
  • 该方法在常规操作变化下增强了实验室内部的一致性.

结论:

  • 内部土壤标准对于纠正受WR面板污染影响的光谱数据至关重要.
  • 常规使用ISS与WR校准一起,提高了土壤光谱数据集的可靠性.
  • 通过WR校准实现ISS测量,支持长期协调土壤光谱库.