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Predicting components of pulpwood feedstock for different physical forms and tree species using NIR spectroscopy and transfer learning

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Abstract

Pulp feedstock components (including extractives, lignin and holocellulose) are major products of the pulp and paper industry, and their proportion in production feedstock (e.g., wood) greatly impact pulp yield and pulp production costs. Near-infrared (NIR) spectroscopy offers a potential solution for rapid characterizing physical and chemical properties of woody biomass. However, NIR models are highly specific to the physical form and species of the samples used in the production process. Traditional calibration transfer (CT) methods usually fail to adapt NIR models to significant differences between spectra. Adversarial transfer learning (ATL) strategies, an emerging algorithm in computer imaging, align source and target distributions by introducing adversarial mechanisms. For the first time, deep ATL architecture, coupled with NIR spectroscopy (collected from ASD LabSpecPro spectrometer), was applied to quantitatively predict the pulpwood feedstock component content for adapting models of different physical forms (wood blocks, wood meals) and tree species to each other without the need for constructing a new model. It was discovered that ATL methods, including domain adversarial neural networks (DANN), domain separation networks (DSN), and dynamic adversarial adaptation networks (DAAN) not only remove the differences between wood block and wood meal spectral data sources (i.e., domains), but also make desired predictions for cross-species domain adaptation. The robustness and stability of the transferred models exceed those of traditional CT and transfer learning methods. Our results suggest that ATL models could be effectively adapted to polymorphic, multi-species pulp feedstock data, and can be extended to the detection and inversion of other feedstock properties.

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Acknowledgments

The authors received supports from the Innovation Foundation for Doctoral Program of Forestry Engineering of Northeast Forestry University (LYGC202114), the Fundamental Research Funds for the Central Universities (Grant Number 2572022AW45) and the Applied Technology Research and Development Plan of Heilongjiang Province (Grant Numbers GA19C006, GA21C030).

Funding

This work was supported by the Innovation Foundation for Doctoral Program of Forestry Engineering of Northeast Forestry University (LYGC202114), the Fundamental Research Funds for the Central Universities (Grant Number 2572022AW45) and the Applied Technology Research and Development Plan of Heilongjiang Province (Grant Numbers GA19C006, GA21C030).

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All authors contributed to the study conception and design. ZZ: Conceptualization, methodology, software, formal analysis, visualization, funding acquisition, writing-original draft. HZ: conceptualization, methodology, software, formal analysis, visualization, funding acquisition, writing-original draft. YL: Funding acquisition, writing-original draft, writing- review & editing. RAW: Writing- review & editing. RP: investigation, data curation. YC: formal analysis, investigation. XL: investigation.

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Correspondence to Yaoxiang Li.

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Zhang, Z., Zhong, H., Li, Y. et al. Predicting components of pulpwood feedstock for different physical forms and tree species using NIR spectroscopy and transfer learning. Cellulose 31, 551–566 (2024). https://doi.org/10.1007/s10570-023-05619-5

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  • DOI: https://doi.org/10.1007/s10570-023-05619-5

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