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Weighted approximation of unbounded continuous functions by sequences of linear positive operators

Coskun T.

Article | 2003 | Indian Journal of Pure and Applied Mathematics34 ( 3 ) , pp.477 - 485

We prove two weighted Korovkin type theorem on the approximation of unbounded continuous functions by linear positive operators on the whole real axis. A construction of a sequence of linear positive operators is given which satisfies our results by applying to Gadjev-Ibragimov operators.

Reactivity and characterisation of various rank turkish bituminous coal chars

Kizgut S. | Baran Y. | Cuhadaroglu D.

Article | 2003 | Journal of Thermal Analysis and Calorimetry71 ( 3 ) , pp.857 - 865

A set of seven bituminous coal chars has been characterised by IR spectroscopy (FTIR), thermogravimetry (TG) and elemental analysis. FTIR study provided suitable information to establish differences between coal samples according to their chemical compositions. The reactivity of these samples was also studied and correlated with the coal parameters of mean vitrinite reflectance, fuel ratio and H/C ratio. The data suggest that reactivity as determined can be correlated with the mean vitrinite reflectance, fuel ratio and H/C ratio (0.90). The order of reactivity of samples were; Amasra (S1) (Rm= 0.65)>Azdavay (S4) (Rm=0.99)?Armutcu . . .k (S2) (Rm=0.81)?Acenta (S3) (Rm=0.92)>Ac212k (S6) (Rm=1.11) Cay (S5) (Rm=1.03)>Sogutozu (S7) (Rm=2.14) Daha fazlası Daha az

Effects of dowels produced from various materials on withdrawal strength in MDF and Pb

Uysal B. | Özçifçi A.

Article | 2003 | Journal of Applied Polymer Science88 ( 2 ) , pp.531 - 535

Wood dowels are commonly used in the construction furniture, but little information is available about the additive effects of dowels on the ultimate withdrawal strength of single or multidowel joints. This study was carried out to determine the tensile strength of 10-mm-diameter dowels produced from medium-density fiberboard (MDF), plywood, scotch pine (Pinus sylvestris L.), and beech (Fagus orientalis lipsky), bonded parallel and vertical to the surface of MDF and particleboard (Pb) with poly(vinyl acetate) (PVAc) and Desmodur-VTKA (D-VTKA). Tensile strength was applied to the dowels according to the procedure in the ASTM-D 1037 s . . .tandard. The effects of dowel species, direction of tensile, composite material, and type of adhesive on tensile strength were determined. The results showed that the highest tensile strength was obtained in beech dowels bonded vertically with PVAc adhesive to the surface of MDF at 7.91 N/mm2. If the dowels used in furniture production are subjected to great tensile strength, beech dowels bonded with PVAc adhesive on MDF should be used. However, when dowels produced from MDF and plywood waste are used, they also can produce positive results Daha fazlası Daha az

2019-12-23

Babuccu, O

Letter | 2003 | TRANSPLANT INTERNATIONAL16 ( 1 ) , pp.58 - 60

WOS: 000181025700010 PubMed: 12545343

Anisotropy and its relation to liquefaction resistance of granular material

Ishibashi I. | Capar O.F.

Article | 2003 | Soils and Foundations43 ( 5 ) , pp.149 - 159

This research establishes quantitative relationships between soil's anisotropy and liquefaction resistance for granular materials. Uniform medium density (Dr = 50%) sand specimens were prepared using three different sample preparation techniques (air pluviated (AP), moist tamped (MT), and moist vibrated (MV)) to create different initial soil fabrics. Undrained cyclic triaxial tests were then performed to determine the liquefaction resistance of each soil specimen. On the same specimens in the triaxial cell, vertical and horizontal compression wave velocities and vertical shear wave velocity (Vs) were measured using piezoelectric ben . . .der elements. Anisotropic (transversely isotropic) elastic constants of the soil specimens were determined from the elastic wave measurements and additional consolidation test data. With the aid of additional data from earlier discrete element model (DEM) simulations, anisotropic parameters, which influence the liquefaction resistance, were examined. It was found that when liquefaction resistance is divided by G12/(E1/E2)3, by G average/(E1E2)3, or by V s 5.0, liquefaction resistance curves converge to a unique curve regardless of the sample preparation techniques. Liquefaction Stress Ratio Reduction Factor (LSRRF) was introduced to estimate the reduction of liquefaction cyclic stress ratio of an anisotropic specimen from the isotropic specimen as simple functions of (E1/E2)-5.0 or (Vs/Vs(iso.))5.0 Daha fazlası Daha az

The effect of Polystimulin-A6 on some morphological properties of beech seedlings (Fagus orientalis L.)

Kirdar, E | Allahverdiev, S

Article | 2003 | ACTA AGRICULTURAE SCANDINAVICA SECTION B-SOIL AND PLANT SCIENCE53 ( 4 ) , pp.200 - 207

An investigation was carried out to consider the effect of polystimulin-A6 on the growth of beech seedlings. A total of 1200 seedlings treated with Polystimulin-A6 at four different concentrations, and a total of 300 control seedlings, were investigated taking account of height, collar diameter, dry weight, number and size of leaves. The greatest height and collar diameter were found with the treatment Polystimulin-A6 at 200 mg/l. In contrast, the control treatment resulted in the least height and collar diameter. The greatest seedling height measured 52.77 cm at the 200 mg/l level, compared with 38.37 cm for the control seedlings. . . .The greatest root collar diameter measured 16.44 mm with the transplanted seedlings, while the least measured 7.01 mm. with the control seedlings. Also, seedling dry weight, root percentage, number and size of leaves were higher than the control. To conclude, it is obvious that Polystimulin-A6 is very effective and has contributed significantly to the metabolism of Fagus orientalis L . seedlings. According to this study, the application of Polystimulin-A6 to beech seedlings has been recommended for practical use in nursery situations Daha fazlası Daha az

Posterior interosseous artery flap in traumatic hand injuries

Ege A. | Tuncay I. | Erçetin Ö.

Article | 2003 | Archives of Orthopaedic and Trauma Surgery123 ( 7 ) , pp.323 - 326

Introduction: Nineteen cases of posterior interosseous artery (PIOA) flap were reviewed. The patients' mean age was 24 (range 14-53) years. Materials and methods: Nine patients were operated on as emergencies, and 10 patients were treated electively. Mean time of delay after trauma was 7.8 h (range 2-20 h) in emergency cases. Nine of them were non-replantable amputations. Skin defects were between 1.9×2.4 cm and 5.0×12.0 cm. Mean hospitalization time was 2.2 (range 1-5) days. Results: Mean flap sensation was evaluated as 2.83-6.65 with the Semmes-Weinstein evaluation scale (only 2 patients scored less than 3.61). Five patients prese . . .nted with discoloration and coolness. Average subjective evaluation was 8.2/10. Mean web opening after first web reconstruction was 40°. One posterior interosseous neuropraxia (recovered in 4 months), one distal flap necrosis, and one flap lost (due to infection) occurred as early complications. Mean follow-up was 12.8 months (range 15 days to 30 months). Conclusions: PIOA flap applications have reduced the need for lateral arm and radial forearm flaps and also shortened hospitalization time in clinical practice Daha fazlası Daha az

Contributions to the knowledge of conifer aphid fauna in Turkey and their zoogeographical distribution

Kaygin A.T. | Çanakçioglu H.

Article | 2003 | Anzeiger fur Schadlingskunde76 ( 2 ) , pp.50 - 56

The Aphidoidea (Homoptera) has 29 species which attack coniferous trees in Turkey. The family Aphididae has 25 (Aphidinae, 1; Lachninae, 22; Mindarinae, 2) species and the Adelgidae, 4. The tribe Cinarini in Lachninae has alone 22 species most of which are important. Especially Cinara cedri Mimeur on Cedrus libani and C. pilicornis (Hartig) on Picea spp. are harmful species. Schizolachnus pineti (Fabricius) is also very important. An Eastern Palearctic species in the tribe Macrosiphini in Aphidinae, Elatobium momii (Shinji), is numerous on Abies bornmülleriana in Bursa-Uludag forests. Pineus orientalis (Dreyfus) in the family of Ade . . .lgidae (Chermesidae) is the most destructive in our Picea orientalis forests in Artvin area (Eastern Black-Sea Section). 21 species out of 29 aphids on coniferous trees are of European origin; only 4 are Mediterranean, 2 Caucasus and Turkistan, one Eastern Palearctic and one of Cosmopolitan origin Daha fazlası Daha az

Türkiye'de Kayıtdışı Ekonominin Tahmini

Çetintaş, Hakan | Vergil, Hasan

Article | 2003 | Doğuş Üniversitesi Dergisi4 ( 1 ) , pp.15 - 30

Bu çalışmada 1971 ve 2000 yılları arasında Türkiye'de kayıtdışı ekonominin büyüklüğü Tanzi'nin metodolojisinden yararlanılarak ekonometrik olarak tahmine çalışılmıştır. Nakit para talebi kullanılarak yapılan çalışmada, 2000 yılında kayıtdışı ekonominin resmi ekonomiye oranı %24 olarak tahmin edilmiştir. In this study, size of the underground economy in Turkey is estimated econometrically by using Tanzi's methodology in period 1971-2000. According to currency demand approach, the ratio of the underground economy to official one is estimated 24 percent in 2000.

Galvanizli çeliklerin mikroyapısı

Baycık, Handan | Koltuk, Fatmagül | Müftüoğlu, Füsun

Article | 2003 | Mühendis ve Makina44 ( 525 ) , pp.27 - 31

Metal korozyonunu engellemek için kullanılan değişik yöntemlerden biri yüzey kaplamadır. Yüzey kaplama için çeşitli yöntemler kullanılır. Metalik kaplama yöntemleri içinde yer alan çinko kaplama, galvanizleme olarak adlandırılır. Galvanizleme genellikle, sıcak daldırma, elektroliz veya metal püskürtme yöntemleri ile yapılır. Bilindiği gibi, galvanizli malzemeler inşaat, konstrüksiyon, otomotiv ve beyaz eşya sanayiinde kullanılmaktadır. Bundan dolayı, galvanizleme konusundaki gelişmelerin tüm toplumu etkileyeceği açıktır. Bu makalede, sıcak daldırma yöntemi ile galvanizleme ve çinko kaplama tavı (galvannealing) yaparak elde edilen ma . . .lzemelerin mikroyapıları incelenmiştir. Galvanizlemede, kaplama yapısı genellikle çelik, $Gamma$, $delta$, $zeta$ ve $eta$ fazlarından oluşur. Çinko kaplama tavında yapı çelik, $zeta$ fazı, $Gamma$ fazı ve yüzeyde küçük bir miktar $zeta$ fazı ile büyük miktarda $delta$ fazı içerir. Surface coating is one of the various methods used for preventing of metal corrosion. Different methods are available for surface coating. Zinc coating which takes part in the metallic coatings methods, is named galvanizing. Galvanizing is usually applied with hot dip, elektrodeposition or metal spraying methods. As it is known, galvanized steels are used for building, construction, automotive industry and electrical goods (refrigerator, oven etc.). Therefore, it is clear that, developments about galvanizing affect all society. In this article, microstructures of the materials galvanized with hot dip method and galvannealed have been examined. In galvanizing, the coating structure generally made up of steel, $Gamma$, $delta$, $zeta$ and $eta$ phases. In galvannealing, the structure comprises steel, $zeta$ phase, $delta$ phase and in the surface small amount of $zeta$ phase and large amount of d phase Daha fazlası Daha az

Effect of different neoadjuvant chemotherapy regimens on locally advance breast cancer

Coskun, U | Gunel, N | Onuk, E | Yilmaz, E | Bayram, O | Yamac, D | Cihan, A

Article | 2003 | NEOPLASMA50 ( 3 ) , pp.210 - 216

In this retrospective study, we evaluated the results of 91 locally advanced breast cancer (LABC) patients (30 patients in stage IIIA-33.0%, 61 patients in stage IIIB-67.0%) who had been treated with different neoadjuvant chemotherapy regimens. Forty-three (47.3%) patients treated with FAC (5-Fluorouracil, doxorubicin, cyclophosphamide) or CA (cyclophosphamide, doxorubicin), 33 (36.3%) with FEC (5-Fluorouracil, epirubicin, cyclophosphamide) or CE (cyclophosphamide, epirubicin) and 15 (16.5%) with CMF (cyclophosphamide, methotrexate, 5-Fluorouracil) combination as neoadjuvant setting. Median follow-up duration was 33 (6-116) months i . . .n 91 patients. There was no significant difference in the pretreatment characteristics of patients receiving FAC/CA, FEC/CE and CMF including age, disease stage, menopausal and estrogen/progesteron receptor (ER/PR) status (p > 0.05). In CMF group, no patient was treated with taxan as adjuvant setting. However, ten patients (30.3%) in FEC/CE group and 21 patients (48.8%) in FAC/CA group were treated with taxans. Overall response rate was lower in CMF group (60.0%), when compared to FEC/CE (81.9%) and FAC/CA (91.0%) groups (p < 0.05). Median overall survival (OS) and diseases free survival (DFS) were similar in three groups; 28.0 months (range: 14.8-41.1) and 12.0 months (range: 5.3-18.6) in CMF, 45.0 months (range: 16.8-73.1) and 23.0 months (range: 0.0-48.6) in FEC/CE, 46.0 months (range: 41.1-50.8) and 22.0 months (range: 11.1-32.8) months in FAC/CA groups, respectively (p > 0.05). In conclusion, overall response rates were found to be higher in anthracycline-based combinations than CMF, but these regimens had no additional survival advantage over CMF regimen. Long-term effects of these regimens should be investigated in further randomized trials Daha fazlası Daha az

Effect of different neoadjuvant chemotherapy regimens on locally advanced breast cancer

Coskun U. | Gunel N. | Onuk E. | Yilmaz E. | Bayram O. | Yamac D. | Cihan A.

Article | 2003 | Neoplasma50 ( 3 ) , pp.210 - 216

In this retrospective study, we evaluated the results of 91 locally advanced breast cancer (LABC) patients (30 patients in stage IIIA - 33.0%, 61 patients in stage IIIB - 67.0%) who had been treated with different neoadjuvant chemotherapy regimens. Forty-three (47.3%) patients treated with FAC (5-Fluorouracil, doxorubicin, cyclophosphamide) or CA (cyclophosphamide, doxorubicin), 33 (36.3%) with FEC (5-Fluorouracil, epirubicin, cyclophosphamide) or CE (cyclophosphamide, epirubicin) and 15 (16.5%) with CMF (cyclophosphamide, methotrexate, 5-Fluorouracil) combination as neoadjuvant setting. Median follow-up duration was 33 (6-116) mont . . .hs in 91 patients. There was no significant difference in the pretreatment characteristics of patients receiving FAC/CA, FEC/CE and CMF including age, disease stage, menopausal and estrogen/progesteron receptor (ER/PR) status (p>0.05). In CMF group, no patient was treated with taxan as adjuvant setting. However, ten patients (30.3%) in FEC/CE group and 21 patients (48.8%) in FAC/CA group were treated with taxans. Overall response rate was lower in CMF group (60.0%), when compared to FEC/CE (81.9%) and FAC/CA (91.0%) groups (p0.05). In conclusion, overall response rates were found to be higher in anthracycline-based combinations than CMF, but these regimens had no additional survival advantage over CMF regimen. Long-term effects of these regimens should be investigated in further randomized trials Daha fazlası Daha az

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