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In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Updated: Sep 11, 2025

Atom Probe Tomography Analysis of Exsolved Mineral Phases
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基于特征带选反转研究的高光谱磁石等级.

Yang Bai1, Xiaoxiao Xie2, Yuna Jia3

  • 1College of Mining Engineering, North China University of Science and Technology, Tangshan, 063210, China.

Scientific reports
|August 13, 2025
PubMed
概括

频谱分析揭示了在特定波长范围内具有明显的磁石等级特征. 部分最小平方回归 (PLSR) 与多次线性渐进回归 (MLSR) 相比,为预测磁铁质量提供了更高的准确性.

关键词:
标志性频段是一种特征.倒置模型的倒置模型.磁铁石是一种磁铁石.这就是PLSR PLSR.频谱签名 频谱签名

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科学领域:

  • 地质科学是地球科学.
  • 矿物学是什么?矿物学是什么?
  • 频谱学是一种光谱学.

背景情况:

  • 磁铁的等级显著影响其光谱特性.
  • 了解这种关系对于矿产勘探和资源评估至关重要.
  • 现有的方法可能缺乏准确的等级确定所需的精度.

研究的目的:

  • 为了研究铁等级对磁铁反射频谱的影响.
  • 为了识别标志着不同磁铁等级的特征光谱带.
  • 从光谱数据中开发和比较用于反转磁石等级的模型.

主要方法:

  • 对各种磁铁铁等级的光谱测试.
  • 分析反射光谱以确定特征波段 (350-1000 nm和1800-2500 nm).
  • 开发部分最小平方回归 (PLSR) 和多线性渐进回归 (MLSR) 模型,用于梯度反转.

主要成果:

  • 磁石等级在光谱曲线趋势中显示出微妙但可辨认的差异.
  • 磁石等级的特征光谱带主要位于350-1000nm和1800-2500nm范围.
  • 比起MLSR模型,PLSR模型实现了比MLSR模型更高的反转精度 (R2 = 0.9982,RMSE = 0.95%).

结论:

  • 反射光谱学可以有效地区分磁铁的等级.
  • 使用光谱数据,PLSR是一种更准确的方法,用于使用光谱数据对磁石等级的定量逆转.
  • 已识别的光谱范围为磁性质评价提供了关键指标.