Spectral Sensitivity of Thermally Modified and Unmodified Wood

Cīrule, Dace; Meija-Feldmane, Anete; Kuka, Edgars; Andersons, Bruno; Kurnosova, Nina; Antons, A.; Tuherm, H.

doi:10.15376/biores.11.1.324-335

Cited by 9 publications

(10 citation statements)

References 21 publications

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“…The light wavelength dependence of photodegradation for thermally modified and unmodified aspen samples were also investigated [28,29]. The total irradiation time was 100 h. It was found, that wavelength longer than 600 nm did not generate degradation of wood.…”

Section: Introductionmentioning

confidence: 99%

Colour stability of oil-heat treated black locust and poplar wood during short-term UV radiation

Németh

Tolvaj

Bak

et al. 2016

Journal of Photochemistry and Photobiology A: Chemistry

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A B S T R A C TBlack locust (Robinia pseudoacacia L) samples with high extractive content and poplar (Populus Â euramericana cv. Pannónia) samples with low extractive content were chosen for the test. The specimens were thermally treated at 160 and 200 C in sunflower oil for 2, 4, and 6 h then irradiated by a strong UV emitter mercury lamp up to 36 h. The effects of thermal treatment and UV radiation were monitored by colour measurement. The results indicated that the extractives play an important role in the photodegradation of oil-heat treated wood. Thermal treatments reduced the lightness change effect of photodegradation. The oil-heat treated black locust samples showed similar photodegradation properties independently on the thermal pre-treatment time and temperature. The redness of oilheat treated black locust samples hardly changed during UV radiation proving the photostability of the thermally modified extractives. The redness change of poplar samples caused by UV radiation was partly determined by the temperature of thermal treatment (darkening and lightening also happened). The yellow colour change of the investigated samples showed that the lignin of thermally modified wood undergoes similar photodegradation as that of the untreated natural wood.

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Section: Introductionmentioning

confidence: 99%

Colour stability of oil-heat treated black locust and poplar wood during short-term UV radiation

Németh

Tolvaj

Bak

et al. 2016

Journal of Photochemistry and Photobiology A: Chemistry

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“…Even where light-induced discolouration was controlled by this treatment, spectroscopic data still showed marked degradation due to heat treatment. 377 The presence of different types of extractives 378 , 379 in wood might account for the variability in results; extractives are organic compounds in wood that can be extracted with solvents. Variables affecting the level of UV stability delivered by thermal treatment of wood has to be further studied before it can find widespread commercial use in outdoor applications.…”

Section: Heat Treatment Of Wood To Control Degradation By Uv Radiation Shows Mixed Results With the Majority Of Studies Indicating No Advmentioning

confidence: 99%

Environmental effects of ozone depletion and its interactions with climate change: Progress report, 2016

Panel¹

2017

Photochem Photobiol Sci

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The Parties to the Montreal Protocol are informed by three Panels of experts. One of these is the Environmental Effects Assessment Panel (EEAP), which deals with two focal issues. The first focus is the effects of UV radiation on human health, animals, plants, biogeochemistry, air quality, and materials. The second focus is on interactions between UV radiation and global climate change and how these may affect humans and the environment. When considering the effects of climate change, it has become clear that processes resulting in changes in stratospheric ozone are more complex than previously believed. As a result of this, human health and environmental issues will be longer-lasting and more regionally variable. Like the other Panels, the EEAP produces a detailed report every four years; the most recent was published as a series of seven papers in 2015 (Photochem. Photobiol. Sci., 2015, 14, 1-184). In the years in between, the EEAP produces less detailed and shorter Progress Reports of the relevant scientific findings. The most recent of these was for 2015 (Photochem. Photobiol. Sci., 2016, 15, 141-147). The present Progress Report for 2016 assesses some of the highlights and new insights with regard to the interactive nature of the direct and indirect effects of UV radiation, atmospheric processes, and climate change. The more detailed Quadrennial Assessment will be made available in 2018.

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“…Apesar de não ser europeia, a maior quantidade de artigos (13) foi encontrada na revista BioResources, editada pela Universidade da Carolina do Norte, Estados Unidos da América (ČERMÁK et al, 2015;CIRULE et al, 2016;FAJDIGA et al, 2016;GAFF et al, 2015;GAŠPARÍK et al, 2015;GAŠPARÍK;GAFF, 2015;KVIETKOVÁ et al, 2015;LING et al, 2016;TORNIAINEN;ELUSTONDO;DAGBRO, 2016;YANG;CHENG;HAN, 2015;YANG et al, 2015;ZHANG et al, 2015).…”

Section: Revistas Científicas Internacionaisunclassified

Retificação térmica, termorretificação, tratamento térmico, tratamento com calor ou modificação térmica?

Batista

2019

Ciênc. Florest.

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As pesquisas brasileiras sobre o processo que tem sido denominado de retificação térmica, termorretificação, tratamento térmico, tratamento com calor e modificação térmica vêm crescendo desde o ano 2000. Como a padronização de conceitos é algo importante para o desenvolvimento científico de uma determinada área, o objetivo deste trabalho foi realizar uma revisão bibliográfica sobre esse processo com a finalidade de se propor a nomenclatura técnica mais adequada para o mesmo em Língua Portuguesa, com fins de padronização. Foram revisados os artigos publicados no tema em 2015, em dez revistas científicas internacionais e em sete brasileiras. Também foi verificado um livro didático estrangeiro, o maior evento científico do tema e informações de empresas europeias detentoras de patentes de processo e que comercializam produtos. Com base análise de todas as fontes, para a padronização do processo e da madeira processada/produto originado, recomenda-se o uso das nomenclaturas técnicas modificação térmica e modificada termicamente, respectivamente. Tecnicamente, não está errado o uso dos termos tratamento térmico e tratada termicamente e seus equivalentes tratamento com calor e tratada com calor (apesar destas serem formas mais raras). Contudo, para não incorrer em erros de interpretação, essas nomenclaturas devem ser evitadas porque são genéricas e tradicionalmente empregadas para o consagrado processo de secagem artificial da madeira. Não se estimula o uso das nomenclaturas retificação térmica e termorretificação, bem como seus derivados retificada termicamente e termorretificada.

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Spectral Sensitivity of Thermally Modified and Unmodified Wood

Cited by 9 publications

References 21 publications

Colour stability of oil-heat treated black locust and poplar wood during short-term UV radiation

Colour stability of oil-heat treated black locust and poplar wood during short-term UV radiation

Environmental effects of ozone depletion and its interactions with climate change: Progress report, 2016

Retificação térmica, termorretificação, tratamento térmico, tratamento com calor ou modificação térmica?

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