İlker Usta

A REVIEW OF THE CONFIGURATION OF BORDERED PITS TO STIMULATE THE FLUID FLOW

As the bordered pits have generally been thought to have an influence on the refractory nature of softwoods, structural behaviour of this conducting pathways is discussed according to the published literature. Various theories on the role of bordered pits to axial flow are expounded in respect to preservative treatment. Pit aspiration is also reviewed.

The effect on shear strength of different surfacing techniques in Oriental beech (Fagus orientalis Lipsky) and Scotch pine (Pinus sylvestris L.) bonded joints

The selection of the most appropriate surfacing technique is influential in the success of bonding, painting and varnishing processes. The objective of the study was to determine which surfacing technique was the most appropriate when applied as the final process in the production of structural wood members, which were subjected to shearing. The study also includes the effect on shear strength of the variables, such as type of wood, plane of cut, type of adhesive and pressing pressure, as they are directly related to the main objective of the study. In view of this objective, the changes in shear strength on radial and tangential cut surfaces of Oriental beech (Fagus orientalis Lipsky) and Scotch pine (Pinus sylvestris L.) woods having different roughness values as a result of sawing with a circular ripsaw, planing and sanding, and bonded with polyurethane (PU) and poly(vinyl acetate) (PVAc) adhesives at 3, 6 and 9 MPa pressure, were studied. The 936 specimens prepared with the objective of determining the effects of variables on bond performance were subjected to a shear test in a universal test equipment in accordance with the ASTM D 905-98 standard. The highest shear strength (13.85 N/mm2) was obtained for the Oriental beech specimens cut from their tangential surfaces with a circular ripsaw, which were glued with PVAc adhesive by applying a pressure of 9 MPa. The lowest value (4.22 N/mm2) was obtained in the specimens planed from their tangential surfaces, which were glued with PU adhesive by applying a pressure of 3 MPa. The specimens obtained from Oriental beech wood showed a higher shear strength compared to the specimens obtained from Scotch pine. In general, in both species of wood, the specimens glued with PVAc adhesive, both on the tangential surfaces and on the radial surfaces, produced higher shear strengths compared to the specimens glued with PU adhesive.

DEPICTIONS ON WOOD: ACCEPTATION AND INTERNALIZATION OF WOOD, WHICH IS AN INTERCULTURAL INTERACTION TOOL, AS “A VALUABLE OBJECT” (WOOD IS VALUABLE)

Kulturlerarasi etkilesim araci olan ahsabin “Degerli Bir Nesne” olarak kabul edilip ozumsenmesi olgusu, “Ahsap Guzeldir” zemininde oznel mantalite ongorusuyle, mumkun oldugunca degisik tarzda ve yapida olusturulan ozgun kompozisyonlarla (asagida takdim edilen toplam 5 adet orijinal betimleme nezdinde) betimlenmistir. Bu betimlemelere esas teskil eden cikarimlar, mesleki/teknik bilgi temelinde icsellestirilmis olup ahsapsever yaklasimla yapilan bu ornek betimlemelerde, (kulturlerarasi etkilesimde seckin bir dogal malzeme olarak benimsenen) ahsabi tanitmaya yonelik genel tasvirler ve ahsabin farkindaligini pekistirici kuramsal aciklamalar yapilmistir