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    Effect of thermal modification on the properties of narrow-leaved ash and chestnut
    (Elsevier, 2012) Korkut, Süleyman; Korkut, Derya Sevim; Kocaefe, Duygu; Elustondo, Diego; Bajraktari, Agron; Çakıcıer, Nevzat
    The concept of thermal modification has evolved from a challenging research program to commercial reality in several European countries in recent years. The aim of this study is to determine the change of various physical properties (oven-dry density, air-dry density, weight loss, swelling and anti-swelling efficiency (ASE)), compression strength parallel to grain, colour difference (Delta E), glossiness and surface roughness of narrow-leaved ash (Fraxinus angustifolia Vahl.) and chestnut (Castanea sativa Mill.) woods after heat treatment under different temperatures and durations. For this study two different temperatures (160 degrees C and 180 degrees C) and two different durations (2h and 4h) were considered. A stylus method was employed to evaluate the surface characteristics of the samples. Roughness measurements by the stylus method were made in the direction perpendicular to the fiber. Four main roughness parameters which are mean arithmetic deviation of profile (RA, mean peak-to-valley height (R-z), root mean square roughness (R-q), and maximum roughness (R-y) obtained from the surface of wood were used to evaluate the effect of heat treatment on the surface characteristics of the specimens. The properties studied were significantly different (p=0.05) at two temperatures and two durations of heat treatment. Based on the findings of this study, the results showed that oven-dry density, air-dry density, swelling, compression strength parallel to grain and surface roughness decreases with increasing heat treatment temperature and time. (C) 2011 Elsevier B.V. All rights reserved.
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    Forest Resources and Sawmill Structure of Kosovo: State of the Art and Perspectives
    (Zagreb Univ, Fac Forestry, 2014) Bajraktari, Agron; Petutschnigg, Alexander; Ymeri, Muhamet; Candan, Zeki; Korkut, Süleyman; Nunes, Lina; Pereira, Helena
    Kosovo, located in the heart of the Balkans, was formerly a part of Yugoslavia. The breakup of Yugoslavia led not only to the creation of new countries and borders; it also had a huge impact on the transportation and availability of raw materials and goods. Kosovo's forest products industry has been greatly affected by the country's current political and legal environment. The creation of new boundaries, combined with trade constraints between Kosovo and some neighboring countries, has changed the amount and type of available wood raw material. Although the forest products industry is a very important part of Kosovo's economy, this change in distribution has had a negative impact on the sawmill structure of the country. To better understand the current state of Kosovo's forest products sector, data was collected through a survey of all sawmills in Kosovo and through information gathered from the Ministry of Agriculture, Forestry and Rural Development of Kosovo. In this paper, the forest resources and sawmill structure of Kosovo are analyzed and the availability of different species of wood in different regions of the country is presented. Based on these findings, recommendations are provided for further development of the forest and sawmill industry.