Surface properties of impregnated and varnished Scots pine wood after accelerated weathering

2013 ◽  
Vol 130 (2) ◽  
pp. 140-146 ◽  
Author(s):  
Ergun Baysal ◽  
Eylem Dizman Tomak ◽  
Musa Ozbey ◽  
Ebedin Altin
Keyword(s):  
Surface Properties ◽  
Scots Pine ◽  
Accelerated Weathering ◽  
Pine Wood

scholarly journals Comparison of Micro- and Standard-Size Specimens in Evaluating the Flexural Properties of Scots Pine Wood

BioResources ◽  
2016 ◽  
Vol 11 (4) ◽  
Author(s):  
Ümit Büyüksarı ◽  
Nusret As ◽  
Türker Dündar ◽  
Ezel Sayan
Keyword(s):  
Scots Pine ◽  
Flexural Properties ◽  
Standard Size ◽  
Pine Wood

scholarly journals Accelerated weathering studies of bioepoxy/ionic liquid blends: influence on physical, thermo-mechanical, morphology and surface properties

2020 ◽  
Author(s):  
Harikrishnan Pulikkalparambil ◽  
Sanjay Mavinkere Rangappa ◽  
Senthilkumar Krishnasamy ◽  
Sabarish Radoor ◽  
Nishar Hameed ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Surface Properties ◽  
Accelerated Weathering

Evolution of extractive composition in thermally modified Scots pine during artificial weathering

Holzforschung ◽  
2019 ◽  
Vol 73 (8) ◽  
pp. 747-755 ◽  
Author(s):  
Haiying Shen ◽  
Jiaqi Xu ◽  
Jinzhen Cao ◽  
Jun Jiang ◽  
Shaodi Zhang ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Fatty Acids ◽  
Scots Pine ◽  
Degradation Products ◽  
Gas Chromatography Mass Spectrometry ◽  
Accelerated Weathering ◽  
Artificial Weathering ◽  
Thermally Modified Wood ◽  
Modified Wood

AbstractIn order to clarify the evolution and role of extractives in thermally modified wood during the process of weathering, the compositions of acetone extractives from thermally modified Scots pine after exposure in an accelerated weathering tester for different durations were determined using gas chromatography-mass spectrometry (GC-MS). Fatty acids and phenolics were proved to be the main types of extractives in weathered thermally modified Scots pine, and some sugars, terpenes and alcohols were also collected. With the progress of weathering, the content of fatty acids decreases significantly while that of phenolics increases. The reduction or even elimination of the fatty acids is presumed to be a physical process, namely, a discharge from wood during exposure to radiation and elevated temperature. The increase of phenolic extractives is mainly due to the photodegradation of other wood components. Phenolic degradation products play the role as a “barrier” against further photodegradation of thermally modified wood, among which vanillin or its derivatives appeared to be the most predominant and important ones.

Mechanical Properties of Alkyl Isocyanate Modified Scots Pine Wood Surfaces

1986 ◽  
Vol 18 (4) ◽  
pp. 259-262 ◽  
Author(s):  
William B. Banks ◽  
Gwynn Lloyd Jones
Keyword(s):  
Mechanical Properties ◽  
Scots Pine ◽  
Pine Wood ◽  
Wood Surfaces ◽  
Alkyl Isocyanate

scholarly journals INVESTIGATION OF 137CS AND 90SR TRANSFER FROM SANDY SOIL TO SCOTS PINE (PINUS SYLVESTRIS L.) RINGS

2010 ◽  
Vol 18 (4) ◽  
pp. 281-287 ◽  
Author(s):  
Ingrida Pliopaitė Bataitienė ◽  
Donatas Butkus
Keyword(s):  
Pinus Sylvestris ◽  
Scots Pine ◽  
Nuclear Power ◽  
Power Plants ◽  
Soil Layer ◽  
Climatic Conditions ◽  
Nuclear Industry ◽  
Transfer Coefficients ◽  
Transfer Factors ◽  
Pine Wood

Artificial radionuclides entered the environment mostly as a result of nuclear explosions, accidents at nuclear power plants and are entering due to the operation of the nuclear industry. After entering the environment, radionuclides spread globally at the world level, affect all environmental components and accumulate here. One of such environmental components is the tree. It, as if a historical chronicle, fixes the previous contamination and the former climatic conditions. One of the ways to read that chronicle is to estimate the radionuclide soil‐to‐tree transfer factors and coefficients. This work presents and analyses the experimental data of a study on the transfer of radionuclides from the soil to Scots pine (Pinus sylvestris L.). The report investigates the transfer of 90Sr and 137Cs from a soil layer of 0–20 cm to Scots pine wood. For investigation, Scots pine (Pinus sylvestris L.) was selected. Its growing site is in Alytus district, in a woody territory, where it falls into an increased radioactive contamination patch. On this growing site, sandy soils are prevailing. It is identified that 90Sr transfer factor to the pinewood under study ranges from 0.005 ± 0.002 to 0.315 ± 0.002, and transfer coefficients from (0.2 ± 0.1) •10–4 to (4.0 ± 0.6) •10–4m2/kg. Meanwhile, the coefficients of 137Cs transfer from the soil to Scots pine wood ranges from – (4.0 ± 1.0) • 10–4 m2/kg to (8.0 ± 2.0) • 10–4 m2/kg. The identified mean transfer coefficients of 137Cs are approximately five times higher than mean coefficients of 90Sr transfer from soil to wood. Santrauka Dirbtines kilmes radionuklidai daugiausiai i aplinka pasklido del vykdytu branduoliniu sprogdinimu, avariju atominese elektrinese ir tebepatenka veikiant branduolinei pramonei. Pateke i aplinka, radionuklidai globaliai pasklinda ir veikia visus aplinkos komponentus bei juose kaupiasi. Vienas iš tokiu aplinkos komponentu yra medis. Jis tarsi istorijos metraštis fiksuoja buvusia užtarša ir buvusias klimatines salygas. Vienas iš būdu perskaityti ši metrašti – radionuklidu pernašos iš dirvožemio i medi faktoriu ar koeficientu vertinimas. Darbe pateikiami ir analizuojami eksperimentiniai radionuklidu pernašos iš dirvožemio i paprastaja puši (Pinus sylvestris L.) duomenys. Nagrinejama 90Sr ir 137Cs pernaša iš 0–20 cm dirvožemio sluoksnio i paprastosios pušies mediena. Tirti parinkta paprastoji pušis (Pinus sylvestris L.). Jos augaviete yra Alytaus apskrityje miškingoje teritorijoje, kuri patenka i didesnes radioaktyviosios užtaršos zona. Šioje augavieteje vyrauja priesmelio tipo dirvožemiai. Nustatyta, kad 90Sr pernašos i tiriamaja pušies mediena faktorius kinta nuo 0,005±0,002 iki 0,315±0,002, o pernašos koeficientai – nuo (0,2 ± 0,1)•10–4 iki (4,0±0,6)•10–4 m2/kg. 137Cs pernašos iš dirvožemio i paprastosios pušies mediena koeficientai kinta nuo (4,0±1,0)•10–4 m2/kg iki (8,0±2,0)•10–4 m2/kg. Nustatyti 137Cs pernašos vidutiniai koeficientai yra apytiksliai 5 kartus didesni nei vidutiniai 90Sr pernašos iš dirvožemio i mediena koeficientai. Резюме Искусственные радионуклиды в окружающей среде появились вследствие ядерных взрывов, аварий на атомных электростанциях и выпадений при работе ядерной промышленности. Радионуклиды распространяются в атмосфере и накапливаются в компонентах окружающей среды. Одним из компонентов окружающей среды являются деревья. Они как бы записывают историю случившегося загрязнения окружающей среды и климатические условия прошлого. Один из способов прочтения такого ежегодника – изучение факторов или коэффициентов переноса радионуклидов из почвы в деревья. В статье анализируются экспериментальные данные о поступлении радионуклидов в сосну (Pinus sylvestris L.) из почвы. Изучается перенос 90Sr и 137Cs из слоя почвы толщиной 0–20 см в компоненты сосны. Местом роста анализируемой сосны (Pinus sylvestris L.) послужила лесная местность в Алитусском районе, в которой после Чернобыльской катастрофы зафиксировано повышенное радиоактивное загрязнение. На этом участке доминирует супесь. Было установлено, что фактор передачи 90Sr из почвы в сосну варьирует от 0,005±0,002 до 0,315±0,002, а коэффициенты – от (0,2 ± 0,1) · 10–4 до (4,0±0,6) · 10 –4 m 2 /кg. Коэффициент переноса 137Cs из почвы в древесину сосны варьирует от (4,0±1,0) · 10–4 m 2 /kg до (8.0±2.0) · 10–4 m 2 /кg. Установлено, что средний коэффициент переноса 137Cs из почвы в древесину сосны (Pinus sylvestris L.) примерно в 5 раз больше, чем коэффициент переноса 90Sr.

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