Filtreler
An operations research application in the particleboard industry [Yongalevha endüstrisinde bir yöneylem araştirmasi uygulamasi]

Karayilmazlar S. | Balaban E.

Article | 2000 | Turkish Journal of Agriculture and Forestry24 ( 1 ) , pp.11 - 18

In this study, a model was used for the optimization of product mix (the amounts of each product in the mixture) in particleboard industry by using linear programming. A theoretical model was constructed in which operations research methods and linear programming were applied to the maximization of the profit of a particleboard mill (KÖYKOBIR) as the consumer of industrial wood. To this end, 1993-1994-1995-1996 production, sales, stock quantities and costs as well as data related to capacities of the chipping, drying, pressing, sanding and gluing units were processed. Moreover, processing times of every product at these units were c . . .alculated. The linear programming model to determine optimum stock quantity, sale, production of particleboard at eight different thicknesses planned to be produced in 1997 was solved by industrial Lindo program and the results are shown in the tables Daha fazlası Daha az

Mechanical properties of heat-treated wooden material utilized in the construction of outdoor sitting furniture

Tankut N. | Tankut A.N. | Zor M.

Article | 2014 | Turkish Journal of Agriculture and Forestry38 ( 1 ) , pp.148 - 158

The present study examined the bending moment capacity and rigidity of T-type out-of-plane furniture joints and investigated the effects of heat treatment, wood species, and joint type factors on these joints. Heat treatment method clearly decreased the modulus of rupture (MOR) and the modulus of elasticity (MOE) of selected wood species. The bending strength of wood samples was reduced after the heat treatment, decreasing with increased loss of mass. For the heat-treated T-type joints, maximum bending strength values were obtained with Iroko (Chlorophora excelsa) for both mortise and tenon (MT) joints and blind MT (BMT) joints. The . . . lowest reduction in bending strength was observed in Ash (Fraxinus excelsior L.) constructed with MT joints and with BMT joints. In general, the BMT joint had higher bending strength than MT joints. The best rigidity constant (7.21) was obtained with control Iroko BMT joints, while the worst rigidity constant (15.10) was obtained with control Oriental spruce (Picea orientalis L.) MT joints. In terms of heat-treated samples, the best rigidity constant (7.59) was obtained with Black pine (Pinus nigra L.) MT joints, while the worst rigidity constant (14.01) was obtained with Oriental spruce BMT joints. The maximum performance in joint stiffness was determined for Iroko sample BMT joints and Iroko MT joints. Lowest reduction in joint stiffness was observed in Scotch pine MT joints and Ash BMT joints. Heat treatment, wood type, and joint type had a significant effect on the bending strength of T-type MT post-rail joints. BMT joints produced from heat-treated Iroko wood can be considered as the most durable T-type joint for outdoor sitting furniture construction. © TÜBİTAK Daha fazlası Daha az

Development of a method for priority setting in forestry research projects in Turkey

Daşdemir, İsmet

Article | 2005 | Turkish Journal of Agriculture and Forestry29 ( 3 ) , pp.211 - 220

Bu çalışma Türkiye'de kamu sektörü ormancılık araştırma projelerinde öncelik belirleme sorununa çözüm getirmek amacıyla ele alınmıştır. Bu amaçla uygulanması ve anlaşılması kolay ve pratik, çok boyutlu, objektif, dinamik, tutarlı ve bilimsel bir metot (kombine metot) geliştirilmiştir. Metodun teorik yapısı, özellikleri, kriterleri ve bu kriterlerin ağırlıklandırılması açıklanmıştır. Kriterlerin seçiminde ve ağıriıklandırılmasında, ulusal kalkınma ve sektörel planlardaki amaçlar ve öncelikler ile ormancılık araştırma projeleri öncelikleri arasında hiyerarşik olarak çok boyutlu tutarlılığı sağlayan, bir yaklaşım izlenmiştir. Çevre ve . . .Orman Bakanlığfna önerilen metot, Türkiye bazında 60 uzmanın katıldığı Araştırma Danışma Çalıştayında, 15 adet yeni ormancılık araştırma projesinin önceliğini belirlemek amacıyla uygulanmıştır. Uygulama sonunda, Türkiye'nin kalkınma amaçlarına, Ormancılık Araştırma Master Planı ve Ulusal Ormancılık Programındaki önceliklere uygun olarak ağaçlandırma, doğa koruma, erozyon kontrolü, mera ıslahı ve agroforestry gibi konuları içeren projelerin ilk sıralarda yer alması, metodun başarılı sonuçlar verdiğini ve kullanılabilir olduğunu göstermektedir. Metodun diğer bazı ülkelerdeki uygulamalardan ve benzer metotlardan farkları ortaya konularak, sağlayacağı faydalar kıt kaynakların etkin kullanımı ve sürdürülebilir kalkınma açısından değerlendirilmiş ve tartışılmıştır. This paper deals with the priority-setting problem in public research projects in the Turkish forestry sector. For this aim, a combined method has been developed, that is scientific, objective, dynamic, consistent, multidimensional, easily applicable and understandable. The theoretical framework, peculiarities and criteria of the method and weighting of the criteria are explained. Assuring hierarchical multidimensional consistency between the purposes and priorities in the national and sectoral plans with the priorities of forestry research projects was followed for selecting the criteria and weighting them. This method was suggested to the Ministry of Environment and Forestry and its application was implemented through a case study in the Research Consulting Workshop consisting of 60 participants to determine the priorities of new 15 forestry research projects on the basis of Turkey. The research projects dealing with plantation, nature conservation, erosion control, range improvement and agroforestry were primarily ranked in accordance with the priorities of development purposes, the National Forestry Program and the Forestry Research Master Plan of Turkey. This means that the method gives successful results and it is applicable. Differences between this method and some other similar methods and its benefits were discussed with regards to the effective use of scarce resources and sustainable development Daha fazlası Daha az

The effect of different land uses on soil microbial biomass carbon and nitrogen in Bartın province

Kara, Ömer | Bolat, İlyas

Article | 2008 | Turkish Journal of Agriculture and Forestry32 ( 4 ) , pp.281 - 288

http://www.trdizin.gov.tr/publication/paper/detail/TnpjMU5EazU= https://hdl.handle.net/20.500.12628/772

Shear and bending strength of some end to end grained joints prepared from scotch pine

Tokgöz H. | Özçifçi A. | Atar M. | Uysal B.

Article | 1999 | Turkish Journal of Agriculture and Forestry23 ( 6 ) , pp.621 - 625

This study was carried out to determine the shear and bending strength of different end-to-end grain joints, which were glued with PVAc (polyvinyl acetate). For this reason, specimens, prepared from scotch pine (Pinus sylvestris I), were made with three types of end to end grain joints namely: half-lap, mortise and tenon and double mortise-and-tenon. End-to-end grain of half-lap joints gave the highest strength in shear (2.385 N/mm2) and bending (0.540 N/mm2) experiments.

Mechanical properties of heat-treated wooden material utilized in the construction of outdoor sitting furniture

Tankut, Nurgül | Tankut, Ali Naci | Zor, Mustafa

Article | 2014 | Turkish Journal of Agriculture and Forestry38 ( 1 ) , pp.148 - 158

Te present study examined the bending moment capacity and rigidity of T-type out-of-plane furniture joints and investigated the efects of heat treatment, wood species, and joint type factors on these joints. Heat treatment method clearly decreased the modulus of rupture (MOR) and the modulus of elasticity (MOE) of selected wood species. Te bending strength of wood samples was reduced afer the heat treatment, decreasing with increased loss of mass. For the heat-treated T-type joints, maximum bending strength values were obtained with Iroko (Chlorophora excelsa ) for both mortise and tenon (MT) joints and blind MT (BMT) joints. Te low . . .est reduction in bending strength was observed in Ash (Fraxinus excelsior L.) constructed with MT joints and with BMT joints. In general, the BMT joint had higher bending strength than MT joints. Te best rigidity constant (7.21) was obtained with control Iroko BMT joints, while the worst rigidity constant (15.10) was obtained with control Oriental spruce (Picea orientalis L.) MT joints. In terms of heat-treated samples, the best rigidity constant (7.59) was obtained with Black pine (Pinus nigra L.) MT joints, while the worst rigidity constant (14.01) was obtained with Oriental spruce BMT joints. Te maximum performance in joint stifness was determined for Iroko sample BMT joints and Iroko MT joints. Lowest reduction in joint stifness was observed in Scotch pine MT joints and Ash BMT joints. Heat treatment, wood type, and joint type had a signifcant efect on the bending strength of T-type MT post-rail joints. BMT joints produced from heat-treated Iroko wood can be considered as the most durable T-type joint for outdoor sitting furniture construction. Te present study examined the bending moment capacity and rigidity of T-type out-of-plane furniture joints and investigated the efects of heat treatment, wood species, and joint type factors on these joints. Heat treatment method clearly decreased the modulus of rupture (MOR) and the modulus of elasticity (MOE) of selected wood species. Te bending strength of wood samples was reduced afer the heat treatment, decreasing with increased loss of mass. For the heat-treated T-type joints, maximum bending strength values were obtained with Iroko (Chlorophora excelsa ) for both mortise and tenon (MT) joints and blind MT (BMT) joints. Te lowest reduction in bending strength was observed in Ash (Fraxinus excelsior L.) constructed with MT joints and with BMT joints. In general, the BMT joint had higher bending strength than MT joints. Te best rigidity constant (7.21) was obtained with control Iroko BMT joints, while the worst rigidity constant (15.10) was obtained with control Oriental spruce (Picea orientalis L.) MT joints. In terms of heat-treated samples, the best rigidity constant (7.59) was obtained with Black pine (Pinus nigra L.) MT joints, while the worst rigidity constant (14.01) was obtained with Oriental spruce BMT joints. Te maximum performance in joint stifness was determined for Iroko sample BMT joints and Iroko MT joints. Lowest reduction in joint stifness was observed in Scotch pine MT joints and Ash BMT joints. Heat treatment, wood type, and joint type had a signifcant efect on the bending strength of T-type MT post-rail joints. BMT joints produced from heat-treated Iroko wood can be considered as the most durable T-type joint for outdoor sitting furniture construction Daha fazlası Daha az

Bazı bitki tohumlarında çimlenmenin aktivasyonu

Sarıbaş, Metin

Other | 2000 | Turkish Journal of Agriculture and Forestry24 ( 5 ) , pp.579 - 584

In this study, activation experiments of germination were done in three species seeds which are naturally distributed in Turkey. Because" The stratification method" needs a long time, a new and faster germination method was sought. The results of the three species are below. Ostrya carpinifolia Scop naturally exists in the Black Sea region, Central Anatolia and as well as in Antalya, Adana and Antakya forests in the Carpinetumzone. This decidous species is from the Betulaceafamily, Coryleaesubfamily, Ostrya L. genus and can be 20m in height with an irregular canopy. Generally, it is confused with CarpinusL. and foresters d . . .o not pay sufficent attention to this species. Seeds have a germination obstacle. In order to overcome this obstacle and provide a faster germination, 5 different germination techniques were applied; Control 16% (in water); Boiling 8%, treatment with hydrogen peroxide 32 %; 64 % (P.S.- AG 30 mg / l) , 56 % (P.S Ğ K 30 mg./ l) . The Taxus baccata L is in danger of extinction and is under protection in Turkey. The result of experiments done in industrial production for germination obstacle prevention showed that the best result was obtained with "P.S.-K 35 mg/l" hormone, and the percentage of germination was 15-35 %. Rosa caninaL is important in the food sector. The result of experiments done in industrial production on the germination obstacle showed that the best results were obtained with "P.S.-AG 50 mg/l" hormone and the germination percentage was 22.2 %. In this study, activation experiments of germination were done in three species seeds which are naturally distributed in Turkey. Because" The stratification method" needs a long time, a new and faster germination method was sought. The results of the three species are below. Ostrya carpinifolia Scop naturally exists in the Black Sea region, Central Anatolia and as well as in Antalya, Adana and Antakya forests in the Carpinetumzone. This decidous species is from the Betulaceafamily, Coryleaesubfamily, Ostrya L. genus and can be 20m in height with an irregular canopy. Generally, it is confused with CarpinusL. and foresters do not pay sufficent attention to this species. Seeds have a germination obstacle. In order to overcome this obstacle and provide a faster germination, 5 different germination techniques were applied; Control 16% (in water); Boiling 8%, treatment with hydrogen peroxide 32 %; 64 % (P.S.- AG 30 mg / l) , 56 % (P.S Ğ K 30 mg./ l) . The Taxus baccata L is in danger of extinction and is under protection in Turkey. The result of experiments done in industrial production for germination obstacle prevention showed that the best result was obtained with "P.S.-K 35 mg/l" hormone, and the percentage of germination was 15-35 %. Rosa caninaL is important in the food sector. The result of experiments done in industrial production on the germination obstacle showed that the best results were obtained with "P.S.-AG 50 mg/l" hormone and the germination percentage was 22.2 % Daha fazlası Daha az

The investigation of loading, unloading and stacking operations in forest transportation in terms of time, productivity and cost in western black sea region [Bati karadeniz bölgesindeki orman nakliyatinda yükleme, boşaltma ve i·stifleme i·şlerinin zaman, verim ve masraf yönünden i·ncelenmesi]

Tunay M. | Varol T.

Article | 1999 | Turkish Journal of Agriculture and Forestry23 ( SUPPL. 2 ) , pp.441 - 447

This study was conducted on methods used in loading, unloading and stacking carried out in forests and forest depots in the western Black Sea region. The aims of this study were to compare methods in terms of time, cost and productivity, and to make suggestions on how these activities could be made more efficient. Time studies were conducted using human and mechanical force for loading, unloading and stacking operations in chosen sample working units, with continuously running chronometer. The results, according to analysis of time measurements, show that administration expenses canbe minimized by using Granab 4515, which has maximu . . .m loading productivity (19.807 m3/h) in areas with annual loading capacities of over 8500 m3, and Caterpillar 920, which has maximum stacking productivity (79.437 m3/h). in areas with annual stacking capacities of over 148.000 m3 Daha fazlası Daha az

Shear and Bending Strength of some End to End Grained JointsPrepared from Scotch Pine

Tokgöz, Hanifi | Özçifçi, Ayhan | Atar, Musa | Uysal, Burhanettin

Article | 1999 | Turkish Journal of Agriculture and Forestry23 ( 6 ) , pp.621 - 625

Bu çalışma, yapı elamanı olarak kullanılan sarıçam odununun polivinil asetat (PVAc) tutkalı ile yapılan farklı boy birleştirmelerinkesme ve eğilme dirençlerini belirlemek amacıyla yapılmıştır. Bu maksatla, sarıçam (Pinus sylvestris I.) odunundan kertme, tam (tek)ve çift zıvanalı olarak hazırlanan ve PVAc tutkalı ile birleştirilen örneklere kesme ve eğilme direnci deneyleri uygulanmıştır.Sonuç olarak, kertme zıvanalı boy birleştirme; kesme (2.385 N/mm2) ve eğilme deneylerinde (0.540 N/mm2) en yüksek direncivermiştir. This study was carried out to determine the shear and bending strength of different end-to-end grain joints, which wer . . .eglued with PVAc (polyvinyl acetate). For this reason, specimens, prepared from scotch pine (Pinus sylvestris l), were made with threetypes of end to end grain joints namely: half-lap, mortise and tenon and double mortise-and-tenon.End-to-end grain of half-lap joints gave the highest strength in shear (2.385 N/mm2) and bending (0.540 N/mm2) experiments Daha fazlası Daha az

Kızılağaç (Alnus glutinosa Gaertn subsp. barbata (C.A. Mey.) Yalt.) gövde hacim tablosu

Saraçoğlu, Nedim

Article | 1998 | Turkish Journal of Agriculture and Forestry22 ( 3 ) , pp.215 - 225

Bu çalısmanın amacı, Dogu Karadeniz Bölgesi Kızılagaç Mescerelerinin tek agaç gövde hacım miktaralarının tahmin edilmesidir. Bölgesel (çift girişli) Gövde Hacim Tablosu, Perşembe-Hopa/Kemalpaşa arasında yayılıs gösteren saf, aynı yaşlı, müdahale görmemiş, normal kapalı ve doğal gelişen 55 Kızılağaç geçici deneme alanlarında seçilen 510 deneme ağacının verilerine göre düzenlenmiştir. Bölgesel Gövde Hacım Tablosunun düzenlenmesinde Regresyon yöntemlerinden yararlanılmıştır. Bu amaçla 6 hacım modeli seçilmiştir. The objective of this study is to estimate the stem volume per single tree for Alnus glutinosa Gaertn subsp. barbata (C.A. Me . . .y.)Yalt. stands of East The Blacksea Region. Double Entry Volume Table was constructed by means of the material collected at the 510 sample trees, were choosen in 55 temporary trial plots taken in the pure, even aged, untouched, normal stocked and naturally grown stands of the Alnus barbata between Persembe and Hopa-Kemalpasa. Several mehods were in evaluation of material and constructing the table. It was based on Regression Methods in obtaining Double Entry Volume Table. 6 volume models were choosen for this purpose Daha fazlası Daha az

Variation in resistance to marine borers in commercial timbers from Turkey, as assessed by marine trial and laboratory screening

Sivrikaya, Hüseyin | Cragg, Simon M. | Borges, Luisa M. S.

Article | 2009 | Turkish Journal of Agriculture and Forestry33 ( 6 ) , pp.569 - 576

Türkiye’de kıyı inşaatlarında ve yat yapımında kullanılan odun türlerinin odun delici omurgasızlara karşı deniz denemesi ve laboratuar testleri yapılmıştır. Çalışmada kayın, meşe, kestane ve sarıçam odunları test edilmiştir. Deniz denemesi 5 ayın üzerinde Türkiye’nin güney kıyısında bulunan Mersin de gerçekleştirilmiştir. Bu süre boyunca teredinid’ lerin aktivitesi çok yüksek olmuştur ve sarıçam diri ve öz odun panelleri EN 275 standardında belirtilen puanlara göre maksimum olan 4 ile derecelendirilmiştir. Meşe panelleri ortalama 2.8 tahribat puanı ile kestane panelleri en az saldırıya maruz kaldığı için 2.3 ile sıralanmıştır. Test . . .edilen odun örneklerinden toplanan teredinidlere ait kabukların büyüklükleri arasında az miktarda farklılık bulunmuştur. Organizmaların saldırı derecesindeki farklılık, çam örneğine nazaran kestane ve meşe panellerinde çok az sayıda canlının yerleştiğini ifade edebilir. Teşhis edilen teredinidlerin yaklaşık yarısı Teredo navalis (Linnaeus 1758), dörtte birlik kısmı Bankia carinata (JE Gray 1827) diğer dörtte birlik kısmı ise Nototeredo norvagica (Spengler 1792) olmuştur. Organizmaların belli bir odun türünü tercih ettiğine dair bir kanıt bulunamamıştır. Ayrıca, paneller üzerinde bazı limnorid saldırılarına da rastlanmıştır. Kabuklu organizmalardan Chelura sp. kestane panelleri üzerinde bulunmuştur. Laboratuar denemesinde Limnoria quadripunctata (Holthuis 1949) nın beslenme oranı dışkı üretimlerine göre değerlendirilmiştir. Kestane, kayın ve meşe öz odunları üzerindeki ortalama beslenme oranı sarıçam diri ve öz odununa göre yarıdan daha az bulunmuştur. Odun yoğunluğu ile beslenme oranı arasındaki ilişki zayıf bulunmuştur. Commercial timbers from Turkey used in coastal construction and boat building were tested for their resistance to marine wood-boring invertebrates in a marine trial and in a laboratory screening test. The timbers tested were beech (Fagus orientalis Lipsky), oak (Quercus petraea (Mattuschka) Liebl.), chestnut (Castanea sativa Mill.), and Scots pine (Pinus sylvestris L.). The marine trial was conducted over a period of 5 months at Mersin on the southern Mediterranean coast of Turkey. Activity by teredinid (Mollusca, Bivalvia) borers during this period was very high, resulting in the maximum rating of 4 on the EN 275 scale for P. sylvestris sapwood and heartwood panels. Q. petraea panels averaged 2.8 and C. sativa panels were attacked the least with a mean rating of 2.3. There was little variation between the timbers tested in the size of the shells of the teredinids found, and so variation in the level of attack can be ascribed to fewer animals colonising C. sativa and Q. petraea than P. sylvestris. About one half of the teredinids identified were Teredo navalis (Linnaeus 1758), one quarter Bankia carinata (JE Gray 1827), and one quarter Nototeredo norvagica (Spengler 1792). No evidence of preference for a particular timber by any of these species was observed. Teeth on the ridges of the shells of teredinids from C. sativa were partially or wholly immersed in a dark brown substance that might reduce the boring efficiency of the shell. Some attacking by limnoriids (Isopoda, Crustacea) was also detected. Specimens of the amphipod crustacean Chelura sp. were observed on panels of C. sativa. In a laboratory screening trial in which the feeding rate of individual Limnoria quadripunctata (Holthuis 1949) was assessed by measuring faecal pellet production, feeding on heartwood of C. sativa, F. orientalis, and Q. petraea averaged less than half of that on the non-durable sapwood and heartwood of P. sylvestris. The correlation between wood density and feeding rate was weak Daha fazlası Daha az

Ağaç Malzemenin Yanmaya Dayanıklılığını Etkileyen Emprenye Maddeleri

Örs, Yalçın | Sönmez, Abdullah | Uysal, Burhanettin

Article | 1999 | Turkish Journal of Agriculture and Forestry23 ( supp2 ) , pp.389 - 394

Yapı malzemesi olarak kullanılan ağaç malzeme bu maksatla kullanılan diğer malzemelerden üstün özelliklere sahip olmakla beraber, biyotik ve abiyotik zararlılardan olumsuz etkilenmektedir. Bu nedenle koruyucu kimyasal maddelerle emprenye edildikten sonra kullanılması önerilmektedir. Bu çalışmada, ağaç malzemeyi koruyucu kimyasal maddelerden suda çözünen tuzlarla emprenye etmenin yanmaya karşı dayanıklılığı üzerine etkileri araştırılmıştır. Bu maksatla yaygın olarak kullanılan sarıçam (Pinus sylvestris L.) ve doğu kayını (Fagus orientalis Lipsky) odunları ile, emprenye maddesi olarak; potasyum nitrat (KNO3), çinko sülfat (ZnSO4), sod . . .yum tetra borat (Na2 B4 O7), sodyum sülfat (Na2SO4) ve bakır sülfat (Cu2SO4) kullanılmıştır. Emprenye metodu olarak uzun süreli daldırma ve 1 saat vakum-1 saat basınç, 30 dakika vakum-30 dakika basınç olmak üzere dolu hücre metodları uygulanmıştır. Emprenye edilen numunelerde, alev kaynaklı ve alev kaynaksız yanma sırasında oluşan ağırlık kayıpları esas alınarak yapılan değerlendirme sonuçlarına göre; Cu2SO4, ZnSO4 ve Na2SO4 sarıçam ve kayında yanmaya dayanıklılık kazandırmışlardır. Bu bakımdan dolu hücre metodu ile yapılan emprenye işlemi daha etkili bulunmuştur. Wood is an important material used in construction elements. However since it can be affected by biotic and abiotic deteriorating agents, it should be treated with chemical impregnating materials prior to use.In this study, the effects of water-soluble impregnating chemicals on the combustion resistance of wood was investigated. For this purpose, panels were prepared with oriental beech wood (Fagus orientalis L.) and pine wood (Pinus silvestris L.), which are widely used in industry. These panels were impregnated with potassium nitrate (KNO3), zinc sulfate (Zn SO4), sodium tetra borate (Na2 B4 O7), sodium sulfate (Na2 SO4) and copper sulfate (Cu2SO4). Two different methods were used for impregnation of the wood samples: extended dipping without pressure, and and full cell with either 60 minutes vacuum-60 minutes pressure, or 30 minutes vacuum-30 minutes pressure.The amount of weight lost during flame- and non-flame burning showed that impregnation with Cu2SO4, Zn SO4 and Na2 SO4 increased the fire resistant of pine and oriental beech wood. For this reason, the full-cell method is more effective in impregnation Daha fazlası Daha az

6698 sayılı Kişisel Verilerin Korunması Kanunu kapsamında yükümlülüklerimiz ve çerez politikamız hakkında bilgi sahibi olmak için alttaki bağlantıyı kullanabilirsiniz.

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