The use of Resistograph for the purpose of nondestructive evaluation of certain properties of standing trees and wooden materials has increased in recent years. The resistance to penetration of a fine drill bit is measured and recorded by the device. A number of properties of the wood can be assessed by the amplitude values obtained from the Resistograph. The aim of this study was to assess the utility of the IML-Resistograph F 500 as a nondestructive tool for estimating spruce wood density using the amplitude data generated and the application of statistical modeling. Wood density data were determined using a volumetric method and were compared with the density data generated by the model. In this model, amplitude was used as an independent variable and the dependent variable for experimental purposes was wood density. No statistical difference (P = 0.176 > 0.05; 95% confidence level) was found between the groups. Moisture content was added as second independent variable and a second model was built. The results demonstrated that wood density can be estimated nondestructively using Resistograph data from lumber and/or large wooden materials, but more comprehensive models are required for the practical use of the device in the forest products industry.
In this study the utilization of kermes oak (Quercus coccifera L.) wood, which could be used as an industrial raw material for the production of fiberboard, was investigated. In the experimental design, boards were produced from mixtures of kermes oak and brutian pine (Pinus brutia Ten.
Özet: Bu çalışmada, yağlı tohumlu bir otsu bir bitki olan kanola (Brassica napus L.) bitkisinin saplarından elde edilen yongalevhaların termal, yanma ve yüzey pürüzlülüğü özellikleri araştırılmıştır. Levhaların deneysel tasarımını, kanola ile kızılçam (Pinus brutia Ten.) yongalarının %0, 25, 50, 75 ve 100 oranındaki karışımları oluşturmuştur. Termal analiz bulguları, kanola yongalarının katılım oranı yükseldikçe üretilen levhaların termal dayanıklılığının artacağını ortaya koymuştur. Ayrıca tek kaynaklı alev testinin sonuçları termal analiz bulgularını desteklemiştir. Levhalardaki yanma izi kanola yonga oranı arttıkça azalmıştır. Levhaların üretiminde kanola yongalarının oranı arttıkça yüzey pürüzlülük değerleri düşüş göstermiştir. Çalışma sonucunda, kanola bitkisine ait sapların kuru şartlarda kullanılacak termal dayanımlı levha üretiminde hammadde olarak kullanılma potansiyeline sahip olduğu görülmüştür.
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