Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

581
Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
581
Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

1.2K
The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
1.2K
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

1.7K
A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
1.7K
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

2.9K
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
2.9K
Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

2.1K
In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
In the Volhard method, a standard excess of AgNO3 is first added to the...
2.1K
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

1.1K
IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
1.1K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Comparison of effectiveness and safety of different haemostatic materials in patients undergoing transradial coronary intervention and diagnosis: a protocol for systematic review and network meta-analysis.

BMJ open·2026
Same author

Effects of repetitive transcranial magnetic stimulation on upper limb motor recovery after stroke: an overview of systematic reviews.

Frontiers in neurology·2026
Same author

The linker governs the organelle targeting of TPP⁺-modified zinc phthalocyanine photosensitizers.

Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology·2026
Same author

pH Gradient at the Nanoscale Zerovalent Iron-Water Interface: Spatial Distribution, Formation Mechanism, and Impacts.

Environmental science & technology·2026
Same author

Evolutionarily conserved and divergent mechanisms of dual Ca<sup>2+</sup> sensors in synaptic vesicle exocytosis.

Proceedings of the National Academy of Sciences of the United States of America·2026
Same author

The impact of drought stress on the physiological biochemical indexes and metabolites in Panax notoginseng.

Scientific reports·2026
Same journal

Design and ab initio vibrational spectroscopy of low dimensional germanium carbide.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy·2026
Same journal

Explainable neural network models for rapid prediction of dielectric constant and acid value in edible oils using FTIR spectroscopy.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy·2026
Same journal

A novel AIE + ESIPT mechanism-based fluorescent probe for selective detection and imaging of cysteine in living cells.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy·2026
Same journal

Multiple pH spectral fusion and DNA methylation analysis based on SERS technology for differentiating benign and malignant lung cancer.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy·2026
Same journal

Comparison of the binding mechanisms and bioactivities of kaempferol and galangin targeting the TLR4 protein: Multispectral analysis and molecular simulation.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy·2026
Same journal

Spectroscopic quantification of aggregation-dependent spectral changes in phthalocyanines: a metric framework and CORRELATO validation.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy·2026
查看所有相关文章

相关实验视频

Updated: Sep 19, 2025

Construction of Models for Nondestructive Prediction of Ingredient Contents in Blueberries by Near-infrared Spectroscopy Based on HPLC Measurements
10:25

Construction of Models for Nondestructive Prediction of Ingredient Contents in Blueberries by Near-infrared Spectroscopy Based on HPLC Measurements

Published on: June 28, 2016

10.7K

基于转移学习的VIS-NIR频谱使用茶叶含水量预测的改进方法.

Haowen Liu1, Fengnong Chen1, Leilei Zhang2

  • 1College of Artificial Intelligence, Hangzhou Dianzi University, Hangzhou 310018 Zhejiang, China.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy
|June 18, 2025
PubMed
概括
此摘要是机器生成的。

可见近红外 (VIS-NIR) 光谱学提供了一种快速检测茶叶水分的方法. 转移学习显著改善了模型的概括性,在较少的样本中实现了高精度.

关键词:
模型优化模型优化支持矢量机器 支持矢量机器茶的水分含量 茶的水分含量转移学习转移学习可见近红外光谱学可见近红外光谱学

更多相关视频

Author Spotlight: Exploring Tea Aroma Using Solvent-Assisted Flavor Evaporation Technique
04:36

Author Spotlight: Exploring Tea Aroma Using Solvent-Assisted Flavor Evaporation Technique

Published on: May 26, 2023

3.6K
O-cresol Concentration Online Measurement Based On Near Infrared Spectroscopy Via Partial Least Square Regression
06:50

O-cresol Concentration Online Measurement Based On Near Infrared Spectroscopy Via Partial Least Square Regression

Published on: November 8, 2019

6.7K

相关实验视频

Last Updated: Sep 19, 2025

Construction of Models for Nondestructive Prediction of Ingredient Contents in Blueberries by Near-infrared Spectroscopy Based on HPLC Measurements
10:25

Construction of Models for Nondestructive Prediction of Ingredient Contents in Blueberries by Near-infrared Spectroscopy Based on HPLC Measurements

Published on: June 28, 2016

10.7K
Author Spotlight: Exploring Tea Aroma Using Solvent-Assisted Flavor Evaporation Technique
04:36

Author Spotlight: Exploring Tea Aroma Using Solvent-Assisted Flavor Evaporation Technique

Published on: May 26, 2023

3.6K
O-cresol Concentration Online Measurement Based On Near Infrared Spectroscopy Via Partial Least Square Regression
06:50

O-cresol Concentration Online Measurement Based On Near Infrared Spectroscopy Via Partial Least Square Regression

Published on: November 8, 2019

6.7K

科学领域:

  • 农业科学 农业科学
  • 频谱学是一种光谱学.
  • 机器学习 机器学习

背景情况:

  • 茶叶植物的生长和质量受到水分含量的影响.
  • 传统的湿度检测方法是破坏性的,缓慢的,劳动密集型.
  • 准确和快速的湿度评估对于茶叶质量控制至关重要.

研究的目的:

  • 开发一种使用可见近红外 (VIS-NIR) 光谱检测茶叶水分含量的非破坏性方法.
  • 调查和提高预测模型在不同样本批次的概括能力.
  • 探索转移学习和组合方法的有效性,以优化湿度预测.

主要方法:

  • 在500-870nm范围内利用可见近红外 (VIS-NIR) 光谱学来获取光谱数据.
  • 开发了茶叶水分含量的预测模型 (FD + SNV + CARS + ε-SVR).
  • 应用堆叠集体学习和基于实例的转移学习以增强模型概括性.

主要成果:

  • FD + SNV + CARS + ε-SVR模型对2024年的数据进行了优秀的预测 (Rp=0.903),但对2022年的数据进行了糟糕的概括 (Rp=0.138).
  • 基于实例的转移学习仅使用55个转移样本实现了高预测准确度 (Rp=0.851).
  • 堆叠集体学习在60个样本中实现了Rp=0.85,证明了更少样本的更好的预测.

结论:

  • VIS-NIR光谱是一种可行的技术,用于快速,非破坏性的茶叶湿度评估.
  • 转移学习和集合方法显著提高模型的概括性,并减少对广泛的样本数据的需求.
  • 优化的模型改善了光谱方法在茶叶质量管理中的实际应用.