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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...
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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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一个基于自适应卷积方法和增强的北方Goshawk优化算法的叠加峰值分解方案.

Hexi Wu1, Sizhi Li2, Rui Qiu3

  • 1School of Nuclear Science and Engineering, East China University of Technology, Nanchang, 330013, China; Department of Engineering Physics, Tsinghua University, Beijing, 100084, China.

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概括
此摘要是机器生成的。

这项研究引入了自适应卷积 (AC) 和增强的北方鱼优化 (ENGO) 方法,用于精确分析化 (NaI(Tl)) 玛射线光谱中的重叠峰值. 这种新的方法准确地分解复杂的光谱,改进了放射性测量.

关键词:
适应性卷积方法适应性卷积方法分解重叠的峰值的分解.在 ENGO 算法中,马射线能量光谱仪 马射线能量光谱仪

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科学领域:

  • 核物理 核物理 核物理
  • 频谱学是一种光谱学.
  • 分析化学 分析化学

背景情况:

  • 化 (NaI(Tl)) 光谱仪对于放射性测量至关重要.
  • 有限的光谱分辨率导致重叠的峰值,阻碍了准确的分析.
  • 现有的方法与背景噪声和峰值重叠作斗争.

研究的目的:

  • 开发一种可靠的方法来准确分解NaI{\displaystyle NaI}{\displaystyle T}{\displaystyle T}{\displaystyle T}{\displaystyle T}}{\displaystyle T}{\displaystyle T}{\displaystyle T}}{\displaystyle T}{\displaystyle T}{\displaystyle T}}{\displaystyle T}{\displaystyle T}}{\displaystyle T}{\displaystyle T}{\displaystyle T}{\displaystyle T}{\displaystyle T}}}
  • 通过抑制背景干扰和改善噪声抵抗来增强光谱分析.
  • 为了实现高精度的峰值参数和区域确定.

主要方法:

  • 一个结合自适应卷积 (AC) 和增强的北方鱼优化 (ENGO) 的新方案.
  • 交流方法用于背景抑制和降噪,同时保留重叠的峰值信息.
  • ENGO算法利用SPM混乱映射,Lévy飞行和非线性步骤大小来进行高维优化.

主要成果:

  • 拟议的方案在分解跨数值,蒙特卡洛和国际原子能机构模拟光谱的重叠峰值方面取得了很高的准确性.
  • 所有峰值参数和区域的相对偏差分别为±0.530%,±0.573%和±1.173%.
  • 证明了精确的光谱分析,无需进行背景减去.

结论:

  • AC-ENGO方案在玛射线光谱分析方面取得了重大进展.
  • 这种方法提供了精确的重叠峰值分解,对于可靠的放射性测量至关重要.
  • 这种方法提高了NaI(Tl) 光谱仪在复杂的光谱环境中的实用性.