Akcin N.A.

Makale | 2000 | Mineral Resources Engineering9 ( 3 ) , pp.323 - 334

The air blasting system which had been used between 1930 and 1950 was abandoned after the development of mechanized production systems. In the 1960s, it has been improved to produce coal by sublevel caving method in steep and thick seams. It has been applied to the steep and thick coal seams at Zonguldak hardcoal region, in Turkey, for 6 years. In this paper, firstly, the air blasting excavation system and sublevel caving production methods are introduced. Secondly, the optimum conditions for the application of the system in the region are presented. For the determination of the optimum conditions, the properties of the coal seam, c . . .haracteristics of air blasting excavation system and limitations of the sublevel caving method are considered. Finally, the results of a pilot application at the Kozlu Colliery are given Daha fazlası Daha az

Coşkun T.

Makale | 2000 | Proceedings of the Indian Academy of Sciences: Mathematical Sciences110 ( 4 ) , pp.357 - 362

In this work we obtain, under suitable conditions, theorems of Korovkin type for spaces with different weight, composed of continuous functions defined on unbounded regions. These results can be seen as an extension of theorems by Gadjiev in [4] and [5].

Güven, M. Haluk

Makale | 2000 | Turkish Journal of Physics24 ( 5 ) , pp.607 - 615

The fragmentation mechanism of the super heated Nİ4 cluster is studied by em­ploying the micro canonical molecular dynamics simulations and an empirical model potential. $Ni_4$ cluster is heated up above the bulk Ni evaporation point temperature and then classical trajectory analysis as well as RRK theory are used to calculate survival probability, evaporation rate, average kinetic energy release and dissociation energy. The fragmentation mechanism of the super heated Nİ4 cluster is studied by em­ploying the micro canonical molecular dynamics simulations and an empirical model potential. $Ni_4$ cluster is heated up above the . . . bulk Ni evaporation point temperature and then classical trajectory analysis as well as RRK theory are used to calculate survival probability, evaporation rate, average kinetic energy release and dissociation energy Daha fazlası Daha az

Dincer, SL | Kargy, E

Konferans nesnesi | 2000 | BLOOD96 ( 11 ) , pp.607 - 615

WOS: 000165256201549

Özçifçi, Ayhan | Yıldırım, Kemal

Diğer | 2000 | Technology3 ( 2-3 ) , pp.91 - 98

Demir, Y | Latifoglu, O | Yenidunya, S | Celebi, C

Mektup | 2000 | ANNALS OF PLASTIC SURGERY45 ( 2 ) , pp.223 - 224

WOS: 000088658800034 PubMed: 10949366

Uysal, Burhanettin | Özçifçi, Ayhan

Diğer | 2000 | Fırat Üniversitesi Fen ve Mühendislik Bilimleri Dergisi12 ( 1 ) , pp.363 - 371

Bu çalışmada, çeşitli kimyasal maddelerle rengi açılan Doğu kayını odununun alev kaynaklı yanma özelliği belirlenmiştir. Renk açma işleminde Oksalik asit (C2O4H2), Sodyum hidroksit (NaOH), Hidrojen peroksit (H2O2), Amonyak (NH3), Hidroklorik asit (HC1) kullanılmıştır. Asetik asit (CH3 COOH) ise nötürleştirme işleminde kullanılmıştır. Deney örnekleri ASTM-E 69 esaslarına göre yakılmıştır. Sonuç olarak; en fazla ağırlık kaybı C2O4H2'de, en fazla CO değişim miktarı NH3+H2O2'de, en yüksek CO2 değişimi ise C2O4H2'de elde edilmiştir. Sıcaklık artışında ve O2 miktarında önemli bir değişiklik görülmemiştir. In this study, the combustion pro . . .perties of beech wood which was bleached by the various chemicals have been determined. In the bleaching process, oxalic acid (C2 O4 H2), Sodium hydroxide (NaOH), Hydrogen peroxide (H2O2), Ammoniac (NH3), Hydrochloric acid (HC1) have been used. Acetic acid (CH3 COOH) has been used for neutralization. Combustion tests have been applied according to ASTM-E 69 standard. As a result, the highest weight loss in C2O4H2, the highest CO rate in NH3+H2O2, the highest CO2 in NH3+H2O2 have been obtained. There is no important differences in heat increasing and O2 rate Daha fazlası Daha az

Ayaz, Y | Horing, NJM

Makale | 2000 | PHYSICAL REVIEW B61 ( 19 ) , pp.12636 - 12638

An explicit closed form determination of the inverse dielectric function for an N-sheet two-dimensional (2D) electron superlattice embedded in a nonlocal bulk host semiconductor plasma is presented here, as well as for an infinite superlattice. The coupled plasmon dispersion relation is analyzed for the model in which the 2D quantum wells constituting the superlattice have just one occupied subband and the bulk plasma of the host has hydrodynamic nonlocality. Nonlocal corrections are obtained for a hybrid superlattice plasmon in interaction with the host bulk plasmon. In addition, we find that this model predicts a new nonlocal low- . . .frequency mode Daha fazlası Daha az

Karayilmazlar S. | Balaban E.

Makale | 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

Uyar, Güray | Çetin, Barbaros

Diğer | 2000 | Ot Sistematik Botanik Derg.7 ( 1 ) , pp.205 - 209

Ankara, Kızılcahamam Soğuksu Milli Parkı, Çamlıdere, Çamkoru bölgelerine 1996-98 yılları arasında yapılan arazi çalışmaları sırasında toplanan örneklerin değerlendirilmesi sonucunda Grimmia trichophylla Grev. var. robusta (Freg.) A.J.E. Smith ve Fontinalis antlpyretica Hedw. var. gigantea (Sull.) Sull. varyetelerinin Türkiye için yeni kayıt oldukları saptanmıştır. As a result of the identification of the taxa collected from Ankara, Kızılcahamam Soğuksu National Park, Çamlıdere, Çamkoru districts between 1996 and 1998. It is found that Grimmia trichophylla Grev. var. robusta (Freg.) A.J.E. Smith ve Fontinalis antipyreti . . .ca Hedw. var. gigantea (Sull,) Sull. are new varieties for the moss flora of Turkey Daha fazlası Daha az

Uysal, Burhanettin | Özçifçi, Ayhan | Atar, Musa

Diğer | 2000 | Technology3 ( 2-3 ) , pp.81 - 90

Bu çalışmada, yüzeyleri sentetik vernikle kaplanmış 18 mm kalınlığındaki etiket yongalı levha (WFB) örnekleri 6, 24, 60 ve 96 saat süre ile su buharı etkisinde bırakılmıştır. Hazırlanan kontrol ve vernikli 10'ar adet örnek TS 3639 standardında belirlenen esaslara uygun olarak su buharı etkisi sonucu ağırlık, kalınlık ve genişlik değerlerinde meydana gelen değişmeler incelenmiştir. Kontrol örneklerine göre vernikli örnekler toplam 186 saat su buharı etkisinde bekletilmesi sonucu sırasıyla, ağırlık artışları % 14, kalınlık artışları % 7 ve genişlik artışları % 0,2 olarak tespit edilmiştir. In this study, the 18 mm thick experimental s . . .amples prepared from waferboard (WFB), covered all faces with synthetic varnish and control samples have been exposed to steam for 6, 24, 60 and 96 hour periods. The effects of weight, thickness and width values of the control and the varnished samples have been determined according to the procedure of the Turkish Standard (TS) 3639. As a result, according to the control samples different dimensional increases have been obtained on weight increases as %14 , thickness as %7 and width as % 0.2 respectively. According to these, there has been less change in the dimensions of the varnished samples than unvarnished one Daha fazlası Daha az

Aydın, Şenay | İrget, M. Eşref | Karakurt, Rıfat | Tutam, Murat | Çakıcı, Hakan

Diğer | 2000 | ANADOLU Ege Tarımsal Araştırma Enstitüsü Dergisi10 ( 2 ) , pp.139 - 157

Bu araştırma Bartın ilinde yetiştirilen fındık bahçelerinin beslenme durumu ve toprak bitki ilişkilerini ortaya koymak amacı ile yapılmıştır. Bu amaçla 14 bahçeden toprak ve yaprak örnekleri alınarak analiz edilmiştir. İncelenen toprakların %35,71'inde toplam azot; %57'sinde alınabilir P, %50'sinde alınabilir K, %7,14'ünde Ca ve Mg, %14,29'un da ise alınabilir Zn açısından yetersizlik bulunabileceği belirlenmiştir. İncelenen fındık bahçelerinden alman yaprak örneklerinin analiz sonuçlarına göre bahçelerin büyük çoğunluğunda N, P ve K açısından yetersiz beslenmenin söz konusu olabileceği belirlenmiştir. This study was carried out in . . .order to determine the plant nutrition ofhazelnut plantations of Bartın province and the relationships between the soil and plant. For this purpose, the samples of soil and leaf taken from 14 plantations were analyzed. It was determined that the deficiencies for nutrition with total N in 35.71%, available P in 57.00%, available K in 14.29% of all soils studied could be existed. According to results obtained from analyses of leaf samples taken from hazelnut plantations studied, it was found that inadequate nutrition appeared in majority for N, P and K Daha fazlası Daha az