Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Yildiz, Salih(5)
- Karsli, Orhan(4)
- Uk, Zuhal Cilingir(4)
- Adanur, Süleyman(3)
- Bayraktar, Alemdar(3)
- Dokuz, Abdurrahman(3)
- Kandemir, Raif(3)
- Kucuk, Haydar(3)
- Küçük, Haydar(3)
- Uysal, Ibrahim(3)
- Wijbrans, Jan(3)
- Ayaydin, Hasan(2)
- Aydin, Faruk(2)
- Bahar, Bilge(2)
- Bayram, Bahri(2)
- Bilici, Ahmet(2)
- Cengiz, Ekrem(2)
- Chen, Bin(2)
- Gedikli, Hasan(2)
- Gumus, Mahmut(2)
- Kantekin, Halit(2)
- Kaya, Elif Celenk(2)
- Kefeli, Umut(2)
- Kurtuldu, Hüseyin Sabri(2)
- Merdan, Mehmet(2)
- Nazir, Bayram(2)
- Oncel, Mustafa(2)
- Sadiklar, M. Burhan(2)
- Salepci, Taflan(2)
- Sipahi, Ferkan(2)
- Topal, Umut(2)
- Uzman, Ümit(2)
- Yetgin, Şükrü(2)
- Yildirim, Emre(2)
- Yildirim, Mehmet(2)
- Çavdar, Ahmet(2)
- Çavdar, Özlem(2)
- Özbek, Mehmet Ferhat(2)
- Özdemir, Atilla(2)
- Akbulut, Omer(1)
Yayınlar
- Derleme MakaleYalnız künye2010Zigana (Gümüşhane, KD-Türkiye)volkanitlerinin alterasyon mineralojisi ve kütle değişimi
Sadiklar, M. Burhan; Sipahi, Ferkan
Doğu Karadeniz (KD-Türkiye) metalojenik provensi’nde bulunan Zigana Dağı (Gümüşhane) civarındaki Geç Kretase volkanik kayaçları yoğun hidrotermal alterasyona ve çok az yüzeysel ayrışmaya maruz kalmışlardır. Tabanda bulunan Geç Kretase bazalt, andezit ve bunların piroklastitleri yine aynı yaşlı Dasit-I ve Dasit-II olarak adlandırılan dasitik kayaçlar tarafından üstlenmektedir. Volkanik kayaçlar bimodal karakterde olup, volkanik yay ortamlarında gelişmişlerdir. Volkanitler serizit/illit-klorit fasiyesinde bozunmuşlardır ve alterasyon ürünü olarak serizit/illit, klorit, kuvars, karbonat mineralleri (ankerit ve kalsit), demir oksit ve nadiren kaolinit, simektit ve epidot içerirler. Serizitleşme/illitleşme volkanitlerinde görülen en yaygın hidrotermal alterasyon türüdür. İllitten sonra en yaygın görülen alterasyon türü klorittir. Piritleşme tüm volkanitlerde görülmekle birlikte en yaygın dasitlerde gözlenir. Bazı alanlarda, yer yer limonitleşme mevcuttur. Epidotlaşma ise nadirdir ve özellikle bazalt ve andezitlerde görülür. Hidrotermal alterasyonun bir sonucu olarak Zigana volkanitlerinde oluşan kütle kazanç ve kayıplarını hesaplamak için isocon analizi uygulanmış ve genel olarak bazalt ve andezitte %2-61 kütle kazancı, Dasit-I %71 kütle kazancı ve %42 kütle kaybı ve Dasit-II’de %44 kütle kazancı ve %32 kütle kaybı hesaplanmıştır. Dolayısıyla, ana kayacın hidrotermal alterasyonu esnasında volkanitlerde hem kütle kazancı hem de kütle kaybı meydana gelmiştir. Genellikle, az altere kayaçtan çok altere kayaca doğru illit-klorit-kaolinit artarken karbonat mineralleri azalır. Volkanitlerde, serizitleşme/illitleşme, kloritleşme ve silisleşmeye sebep olan sıvıların Cu, Pb ve Zn gibi metalleri arttırmadığı, gerçekte bu sıvıların bu metallerce fakir olduğu söylenebilir. Bu aynı zamanda onların değişik hidrotermal şartlar altında geliştiğine işaret eder.
- MakaleYalnız künye2010Measurement of the physician empathy and the variation of the this measurement in relation to demographic variables
Teke, A. Kadir; Demir, Cesim; Cengiz, Ekrem
Empathy is the capacity to recognize or understand another's state of mind oremotion. It is often characterized as the ability to "put oneself into another's shoes", orto in some way experience the outlook or emotions of another being within oneself. Theimportance of empathy is more apparent in professions like medicine. In this study, it isaimed to determine the empathy levels of physicians and to investigate whether thesevary by demographic factors. As a result, it is demonstrated that the empathy level ofphysicians is determined by two factors named “posit” and “emotional approach”.Furthermore, it is suggested that the empathy level differs by gender, years of practice,position, age and department variables.
- MakaleYalnız künye2010Yerel yönetimlerde halkla ilişkiler faaliyetlerinin kurum imajına etkisi üzerine bir çalışma: Trabzon
Bekiroğlu, Habibe Akçay; Türk, M. Sezai
Belediyeler, halk ile yönetim arasındaki ilişkilerin en yoğun yaşandığı kurumlardır. Günümüzde halk, geçmişe oranla, yönetimle ilgili bilgi sahibi olmayı daha fazla istemekte, yönetimle ilgilenmektedir. Kurumla iletişimde bulunmak için ise çoğu zaman informal olmak üzere, birçok yola başvurmaktadır. Doğru halkla ilişkiler çalışması ve imaj stratejisi örgütün hedef kitle tarafından olumlu algılanması ve içselleştirilmesini sağlamaktadır. Bu çalışmada, Trabzon Belediyesi’nin yapmış olduğu halkla ilişkiler faaliyetlerini tanıma ve tanıtma faktörleri şeklinde sınıflandırılmış ve bu faktörlerin, kurum imajı faktörü olarak belirlenen fiziksel özellik, sosyal sorumluluk, hizmet kalitesi ve kurum yöneticisi faktörlerine etkisi ölçülmüştür.
- MakaleYalnız künye2010Fen Bilgisi Öğretmen adaylarının ışık ve atom kavramlarını anlama seviyelerinin tespiti
Kaya, Ali
Bu çalışma, Fen Bilgisi Öğretmenliği bölümü öğrencilerinin ışık ve atom kavramlarını anlama seviyelerini ve onların bu kavramlarla ilgili yanlış anlamalarının olup olmadığının tespit edilmesi amacıyla yapılmıştır. Çalışma verileri, 2003–2004 eğitim-öğretim yılı güz yarıyılında Fen Bilgisi Öğretmenliği programı 3. sınıf öğrencilerinden 62 öğrenciye geliştirilen 16 maddelik bir test uygulanması ve 12’si ile de mülakat yapılmak suretiyle elde edilmiştir. Test ve mülakatlardan elde edilen bulgular, öğrencilerin ışık ve atom kavramlarını anlama düzeylerinin sırasıyla % 26 ve % 84 olduğu yine bu kavramlarla ilgili sırasıyla % 34 ve % 6 oranlarında yanlış anlamalara sahip oldukları tespit edilmiştir. Bu yanlış anlamalardan ışık kavramı ile ilgili olan bazıları; “Işık ulaştığı yüzeyi aydınlatan maddedir”, “Işık, belli bir kaynaktan çıkıp sonsuza kadar giden doğrular topluluğudur” şeklinde ve atom kavramı ile ilgili ise; “Atom, maddenin bölünemeyen en küçük yapı taşıdır” şeklindedir. Öğrencilerin ışık kavramı konusunda oldukça düşük bir anlama seviyesine sahip oldukları ve iki kavramla ilgili olarak da yanlış anlamalarının olduğu görülmektedir. Benzer çalışmaların diğer eğitim fakültelerinde de gerçekleştirilerek bu konuların sunumunda elde edilen araştırma sonuçlarının dikkate alınmasının yararlı olacağına inanılmaktadır.
- Proje2010Adakit benzeri porfirlerin petrolojik özellikleri, KD Türkiye: Doğu pontidler'in üst kretase sonrası jeodinamik modeli için yeni bulgular
Wijbrans, Jan; Uysal, İbrahim; Chen, Bın; Karsli, Orhan; Erduran, Murat; Boztuğ, Durmuş; Kandemir, Raif
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- Proje2010Asfalt kaplamalarda sinerjik fayda kavramının anlaşılması, mekaniksel performans deneyleri ve bilgisayarlı tomografi görüntüleri yardımıyla deformasyon ve çatlama problemlerinin değerlendirilmesi
Iskender, Erol; Yildirim, Yetkin; Tayfur, Süreyya; Aksoy, Atakan; Ozen, Halit
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- Proje2010Karadeniz Bölgesi' nde karayemiş seleksiyonu ve çoğaltılması üzerine araştırmalar
Kalkışım, Özgün; İslam, Ali; Vardal, Emre; Aygün, Ahmet; Çelık, Hüseyın
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- MakaleAçık Erişim2010Combination technique of tumescent anesthesia during endovenous laser therapy of saphenous vein insufficiency
Memetoglu, Mehmet Erdem; Kurtcan, Serpil; Kalkan, Asim; Özel, Deniz
Objective: This study aimed at evaluating the efficiency of applying tumescent anesthesia before an ablation procedure and continuously during endovenous laser treatment (EVLT) (combined tumescent technique) of saphenous vein insufficiency to reduce the patients pain and discomfort. Methods: Twenty-five patients with 31 duplex-confirmed great saphenous vein insufficiency underwent endovenous laser (940 nm) varicose vein treatment between December 2009 and April 2010. The patients were randomized in two groups. In group A (15 patients) tumescent anesthesia was used before the ablation procedure and in group B (10 patients) tumescent anesthesia was used before and continuously during the procedure. Patients were scheduled for a three-day examination after EVLT to assess the level of pain experienced. Results: According to the statistic analysis we observed that the mean level of pain score for the patients given classical tumescent anesthesia showed a higher level (P=0.003) compared with the patients given tumescent anesthesia in the combined procedure. Conclusion: Combination technique of administering tumescent anesthesia before ablation and continuously during the EVLT procedure may be an alternative way to reduce the patient's peroperative pain and discomfort. (C) 2010 Published by European Association for Cardio-Thoracic Surgery. All rights reserved.
- MakaleAçık Erişim2010The Relationship Between Knee Osteoarthritis and Osteoporosis
Sezer, Ilhan; Illeez, Ozge G.; Tuna, Serpil D.; Balci, Nilufer
Objective: The aim of this study was to investigate the association between knee osteoarthritis (OA) and bone mineral density (BMD) in the femur and lumbar vertebrae. Materials and Methods: A total of 74 female patients (mean age 61.9 +/- 9.1 years, mean body mass index 27.09 +/- 4.24) diagnosed with knee OA were included in this study. To assess knee OA, bilateral weight-bearing antero-posterior knee radiographs were taken and graded from 0 to 4 according to Kellgren-Lawrence criteria. The BMD of the subjects was measured using dual-energy X-ray absorptiometry (DEXA). BMD measurements of those with OA were compared with those without OA. Results: While there was no correlation between BMD and the grade of knee OA, a significant negative correlation was found between age and femur BMD. Body mass index was positively correlated with OA and negatively correlated with OP. Conclusion: Further investigations are needed to demonstrate the association between knee OA and BMD.
- MakaleAçık Erişim201017,18-Dibromo-8-methyl-4,12-ditosyl-3,4,5,6,7,8,9,10,11,12,13,14-dodecahydro-2H-benzo[b][1,4,7,11,15]dioxatriazacycloheptadecine
Kelesoglu, Zeynep; Kaya, Elif Celenk; Kantekin, Halit; Bueyuekguengoer, Orhan
In the title compound, C31H39Br2N3O6S2, a 17-membered aza-macrocyclic ligand containing two ether O and three aza N atoms, the three pendant aromatic rings form an 'E' shape. The dihedral angles between the central benzene ring and the side ones are 17.8 (3) and 7.4 (3)degrees , and the dihedral angle between the tosyl rings is 10.6 (3)degrees . The methyl group is disordered over two orientations, with occupancies of 0.52 (15) and 0.48 (15).
- MakaleYalnız künye2010The Alteration Mineralogy and Mass Change of the Zigana (Gumushane) Volcanics of NE Turkey
Sipahi, Ferkan; Sadiklar, M. Burhan
The Late Cretaceous volcanic rocks around Zigana Mountain (Gumushane) in the eastern Black Sea metallogenic province in NE Turkey show intensive hydrothermal alteration but less weathering alteration. The basement of the study area is formed by Late Cretaceous basalt, andesite and their pyroclastics. These rocks are overlain by dacitic rocks of the same age, namely Dacite-I and Dacite-II. These volcanic rocks are bimodal in character and have developed in a volcanic arc environment. The volcanic rocks in the study area have been altered to the sericite/illite-chlorite facieses, and contain sericite/illite, chlorite, quartz, carbonate minerals (ankerite and calcite), iron-oxide, and rare kaolinite, smectite and epidote as the products of alteration. Sericitization/illitization is the most common type of hydrothermal alteration associated with these volcanics, and chloritization is the most common alteration type after illitization; pyritisation is seen in all volcanics, and is the most common in dacites. In some fields limonitisation is occasionally present. Epidotization is rare, and especially seen in basalt and andesite. Isocon analysis was undertaken to estimate the mass gains and losses of the Zigana Volcanics as a result of hydrothermal alteration. In general terms, the results shows that, basalt and andesite have 2-61% mass gain, Dacite-I 71% mass gain and 42 % mass loss, and Dacite-II 44% mass gain and 32% mass loss. Namely, both mass gain and mass loss occurred in the volcanics during the hydrothermal alteration of the parent materials. From less altered rock to highly altered rock there was an increase in illite-chlorite-kaolinite whereas there was a decrease in carbonate minerals. In the volcanics, fluids which cause sericitization and chloritization did not increase metals like Cu, Pb and Zn and, in fact, it can be said that these fluids are poor in point of these metals. This also shows that the metals developed under different hydrothermal conditions.
- MakaleYalnız künye2010The synthesis and characterization of metal-free and metallophthalocyanine polymers by microwave irradiation containing diazadithia macrocyclic moieties
Kaya, Elif Celenk; Karadeniz, Huelya; Kantekin, Halit
A tetranitrile monomer was synthesized by nucleophilic aromatic substitution of N,N'-(2,2'-(propane-1,3-diylbis(sulfanediyl))bis(ethane-2,1-diyl))bis(4-methylbenzenesulfonamide) onto 4-nitrophthalonitrile. A metal-free phthalocyanine polymer was prepared by the reaction of the tetranitrile monomer under N-2 in the presence of 2-(dimethylamino)ethanol at 145 degrees C for 24 h. Zinc(II), copper(II), cobalt(II), nickel(II), lead (II), phthalocyanine polymers were prepared by reaction of the tetranitrile with the chlorides of zinc (II), copper (II), cobalt (II), nickel (II), lead (II), employing microwave irradiation in the presence 2-(dimethylamino)ethanol at 175 degrees C, 350 W for 10 min. The thermal stabilities of the phthalocyanine compounds were determined by thermogravimetric analysis. The new compounds were characterized by a combination of IR, H-1 NMR, C-13 NMR, UV-vis, elemental analysis and MS spectral data. (C) 2009 Elsevier Ltd. All rights reserved.
- MakaleYalnız künye2010Liquefaction of cotton stalks (Gossypium hirsutuml.) with phenol
Fidan, M.Said; Alma, M.Hakki; Bektas, Ibrahim
In this study, we aimed to synthesize resol type wood adhesive from resinification of cotton stalk liquefied into phenol in the presence of sulfuric acid as catalyst. The biomass was first liquefied with phenol in the presence of sulfuric acid as a catalyst at various reaction conditions. It was detected that increasing acid concentration, temperature and time resulted in a great decrease on the amount of unliquefied cotton stalks and a significant increase in the percentage of combined phenol in the produced resin. It was also found out that the resin produced from cotton stalks can be perfectly used in the production of wood composite materials.
- MakaleAçık Erişim2010Structure and geochemistry of an Alaskan-type ultramafic-mafic complex in the Eastern Pontides, NE Turkey
Eyuboglu, Yener; Dilek, Yildirim; Bozkurt, Erdin; Bektas, Osman; Rojay, Bora; Sen, Cuneyt
The Karayasmak ultramafic-mafic association (KUMA) in NE Turkey represents an Alaskan-type, pre-Liassic intrusion in the Pulur metamorphic massif and is one of many such intrusive complexes that were emplaced into the continental basement of the Eastern Pontides belt during the pre-Liassic. Its main lithological units include plagioclase peridotite, melagabbronorite, banded gabbro and anorthosite (Phase-I), gabbro-pegmatite dikes (Phase-II), unmetamorphosed banded gabbro (Phase-III), cumulate olivine gabbronorite (Phase-IV), and non-cumulate gabbroic dikes and stocks (Phase-V). The contact relations between these units are gradational or intrusive, with the peridotites (Phase-I) enveloping the cumulate gabbronorites (Phase-IV) in the center of the elliptical body, displaying a concentric reverse-zoning pattern. Cr-Al spinel, plagioclase, and olivine are the first crystallizing phases in all cumulate rocks, whereas pyroxene, hornblende, phlogopite, magnetite, and ilmenite represent the intercumulus phases. The existence of hornblende and phlogopite, the high Wo and Cr2O3 contents of clinopyroxene, and the high Fo and NiO contents of olivine indicate that the KUMA units were the near-liquidus fractional crystallization products of hydrous basaltic magma. The Phase-I and Phase-III cumulates are slightly enriched in LILE and LREE, depleted in HFSE and HREE with respect to chondrite and primitive mantle, and show negative Nb, Zr, Hf and Ti anomalies. The Phase-IV cumulate gabbronorites are even more enriched in LILE and LREE and show less depletion in HFSE and HREE in comparison to the earlier phases. The KUMA units formed from high-Al hydrous basaltic magmas, which were derived from partial melting of a previously subduction-metasomatized subcontinental-lithospheric mantle. These magmas underwent crystal fractionation and mineral concentration processes in small magma chamber(s) at shallow crustal levels (< 5 kbar).
- MakaleYalnız künye2010Consumer perceptions of organic foods in Turkey
Ilyasoǧlu, Huri; Temel, Sara; Özçelik, Beraat
This study presents the results of a survey regarding consumer perceptions of organic foods in Turkey. The survey was conducted to determine consumer attitudes towards organic foods and the reasons for consumption or non-consumption of organic foods. A total of 383 consumers from different occupational groups living in Istanbul participated in the research. The results of the survey revealed that more than half of the survey participants had knowledge about organic foods. The majority of the participants were positive towards organic foods and purchased them as well. The results of chi-square analysis showed that the consumption of organic foods varied with respect to gender, job and education. Women and more educated participants tend to buy organic foods more than other participants. In market, fruits and vegetables, cereals and legumes, dried fruits and dairy products were organic products recognized by consumers. The main organic products purchased by consumers were fruits and vegetables. The results of the survey also indicated that the participants confidence in organic foods was at moderate level. About 37% of the participants was found to rely on organic foods and about 49% of the participants were unsure about organic foods. Organic foods were purchased because they were perceived as healthy, environmentally friendly and more nutritious than conventional foods. However, the consumption of organic foods was found to be lower. The majority of the participants stated that they consumed organic foods rarely or sometimes. Price and lack of availability of organic foods were barriers to increase the consumption of organic foods.
- MakaleYalnız künye2010Generation of the Early Cenozoic adakitic volcanism by partial melting of mafic lower crust, Eastern Turkey: Implications for crustal thickening to delamination
Karsli, Orhan; Dokuz, Abdurrahman; Uysal, Ibrahim; Aydin, Faruk; Kandemir, Raif; Wijbrans, Jan
Early Cenozoic (48-50 Ma) adakitic volcanic rocks from the Eastern Pontides, NE Turkey, consist of calc-alkaline and high-K calc-alkaline andesite and dacite, with SiO2 contents ranging from 56.01 to 65.44 wt.%. This is the first time that Early Eocene volcanism and adakites have been reported from the region. The rocks are composed of plagioclase, amphibole, quartz, and Mg-rich biotite. They have high and low-Mg# values ranging from 55 to 62 and 13 to 42, respectively. High-Mg# rocks have higher Ni and Co contents than low-Mg# samples. The rocks exhibit enrichments in large ion lithophile elements including the light rare earth elements, depletions in Nb, Ta and Ti and have high La/Yb and Sr/Y ratios. Their relative high ISr (0.70474-0.70640) and low εNd (50 Ma) values (- 2.3 to 0.8) are inconsistent with an origin as partial melts of a subducted oceanic slab. Combined major- and trace element and Sr-Nd isotope data suggest that the adakitic magmas are related to the unique tectonic setting of this region, where a transition from a collision to an extension stage has created thickening and delamination of the Pontide mafic lower crust at 50 Ma. The high-Mg adakitic magmas resulted from partial melting of the delaminated eclogitic mafic lower crust that sank into the relatively hot subcrustal mantle, and its subsequent interaction with the mantle peridotite during upward transport, leaving garnet as the residual phase, elevates the MgO content and Mg# of the magmas, whereas low-Mg# magmas formed by the melting of newly exposed lower crustal rocks caused by asthenospheric upwelling, which supplies heat flux to the lower crust. The data also suggest that the mafic lower continental crust beneath the region was thickened between the Late Cretaceous and the Late Paleocene and delaminated during Late Paleocene to Early Eocene time, which coincides with the initial stage of crustal thinning caused by crustal extensional events in the Eastern Pontides and rules out the possibility of an extensional regime before ~ 50 Ma in the region during the Late Mesozoic to Early Cenozoic.
- MakaleYalnız künye2010Prognostic significance of perineural invasion in patients with gastric cancer who underwent curative resection
Bilici, Ahmet; Seker, Mesut; Ustaalioglu, Bala Basak Oven; Kefeli, Umut; Yildirim, Emre; Yavuzer, Dilek; Aydin, Fatih Muhammed; Salepci, Taflan; Oncel, Mustafa; Gumus, Mahmut
Background: The prognostic significance of perineural invasion (PNI) in gastric cancer has been previously investigated in a few studies, but had not reached a consensus. The aim of this study was to determine the prognostic value of PNI in patients with gastric cancer who underwent curative resection. Materials and Methods: We retrospectively analyzed 238 patients who had undergone curative gastrectomy. Paraffin sections of surgical specimens from all patients were stained with hematoxylin and eosin. PNI was defined when carcinoma cells infiltrated into the perineurium or neural fascicles. PNI and the other prognostic factors were evaluated by univariate and multivariate analysis. Results: PNI was detected as positive in 180 of the 238 patients (75.6%). pT stage, tumor size, lymph node metastasis, clinical stage, tumor differentiation, Borrmann classification, histological type, lymphatic vessel invasion, and blood vessel invasion were closely associated with the presence of PNI. The PNI-positive tumors had significantly larger size and more lymph node metastasis than the PNI-negative tumors (P =.001 and P <.001, respectively). The median survival of the PNI-positive patients was significantly worse than that of the PNI-negative patients (28.1 vs. 64.9 months, P =.001). Multivariate analysis indicated that the positivity of PNI was an independent prognostic factor (P =.02, hazard ratio [HR]: 2.75; 95% confidence interval [95% CI]:1.12-3.13) as were classical clinicopathological features. Conclusion: Our results showed that the frequency of PNI was high in patients with gastric cancer who underwent curative gastrectomy and the proportion of PNI positivity increased with progression and clinical stage of disease. PNI may be useful in detecting patients who had poor prognosis after curative resection in gastric cancer.
- MakaleYalnız künye2010Responses of some wheat genotypes and their F2 progenies to salinity and heat stress
Yildirim, Mehmet; Bahar, Bilge
Both heat and salinity cause yield decrease in wheat. Grain yield in wheat has increased as a result of breeding efforts for different stress conditions. However, there are still substantial opportunities to improve grain yield by using conventional breeding under stress conditions, like heat and salt stress. The objective of this study was to investigate heat and salt effects on yield and some agronomic traits of four wheat genotypes and their six half F2 diallel cross progenies grown in pots. Significant differences were found among the genotypes for grain yield under both heat stress and non-stress condition. There was a mean reduction in yield of 12.6% due to salt stress. The reduction in biomass was higher than grain yield under salt stress while it was lower at heat stress. Grain yield was positively correlated with spike weight, harvest index, grain numbers per plant and biological yield under non stress (NS), heat stress (HS) and salt stress (SS) conditions. Cultivars Seri 82 and Chil's had high yield among parents under both NS and SS. Chil's and its hybrids showed low reduction in yield due to SS; thus, exhibiting salt tolerance. Also, Chil's was found to be good combiner with high General Combining Ability (GCA) effects for grain yield under SS conditions. 84 CZT04 was the most susceptible cultivar under SS. Significant GCA effects of Genç 99 and 84CZT04 provided positive contribution to grain yield under HS. It was impossible to select both heat and salt tolerant genotype with high yield capacity from the used genotypes. However, heat or salt tolerant genotypes can be improved by selection breeding due to genetic variation among genotypes.
- MakaleYalnız künye2010Late Cretaceous high-K volcanism in the eastern Pontide orogenic belt: Implications for the geodynamic evolution of NE Turkey
Eyüboǧlu, Yener
High-K volcanics were produced in two different Late Cretaceous cycles during the infilling of back-arc basins of the eastern Pontides. The first cycle, represented by shoshonitic trachyandesites and associated pyroclastics, containing high K2O (2.74-4.81 wt-%) and NaK2O (3.60-5.51 wt-%), overlies a mid-Cretaceous ophiolitic-olistostromal melange formed during the rifting stage of a back-arc basin (Neotethys). 40Ar39Ar dating of biotite from trachyandesite at the base of the first cyle indicates that shoshonitic volcanism in the far south of the eastern Pontides started in the early Campanian. Volcanic rocks of this cycle are overlain by upper Campanian-Maastrichtian rudist-bearing reefal limestones. The second cycle of high-K volcanism is represented by analcime-bearing volcanic rocks erupted in a Neotethyan lagoonal environment. These volcanic rocks, intercalated with continental detritus, are characterized by high a2O (3.22-7.16 wt-%), now concentrated in secondary analcime crystals. Their K2O contents also range between 0.83 and 6.05 (wt-%). All of these units are disconformably overlain by Eocene turbidites with a basal conglomerate. Volcanic rocks belonging to both cycles show various enrichment degrees in LILE, HFSE, LREE, and HREE with respect to primitive mantle and chondrite [(La/Lu) cn=11.10-25.89]. Negative Nb, Ta, Zr, Hf, and Ti anomalies are typical of these subduction-related arc magmas. Geochemical similarities between the two volcanic cycles suggest that trachyandesites and analcime-bearing volcanics were derived from similar enriched mantle sources, and that they formed in the same geotectonic setting of a back-arc basin environment of the eastern Pontide magmatic arc during the Late Cretaceous. In addition, Nd-Sr and Pb isotope ratios of the investigated volcanic units indicate that their mantle melt sources were similar. The new geological, geochemical and isotopic data suggest that southward subduction of the Palaeotethyan oceanic crust can be separated into two main stages for the late Mesozoic Pontide orogenic belt. Early southward subduction ended by slab break-off during the mid-Cretaceous, resulting in upwelling and injection of asthenospheric mantle that caused the opening of the eastern Pontide back-arc basin (Neotethys). Resumption of southward subduction began with intense TH-CA bimodal volcanism in the northern front of the arc during the Turonian-Coniacian. The intensity of this Late Cretaceous magmatism in the north decreased towards the south, and a transition to monogenic calcalkaline-alkaline (CA-A) Campanian andesitic volcanism developed in the southern zone. Yet farther south, andesitic igneous activity graded into the Campanian-Maastrichtian shoshonitic and ultrapotassic volcanism in the Bayburt-Maden, Tokat, Amasya, and Gümüshaciköy areas. This zoning of the Late Cretaceous arc magmatism (TH-CA, CA-A and shoshonitic-ultrapotassic, from north to south) also supports the concept of southward subduction during late Mesozoic evolution of the eastern Mediterranean region.
- MakaleYalnız künye2010Numerical analysis of entropy generation in concentric curved annular ducts
Kucuk, Haydar
The entropy generation has been numerically investigated in concentric curved annular square ducts under constant wall temperature boundary condition. The problem has been assumed to be steady, hydrodynamically and thermally fully developed and incompressible laminar flow with constant physical properties. The solutions of discretized equations for continuity, momentum and energy have been obtained by using an elliptic Fortran Program based on the SIMPLE algorithm. Solutions have been achieved for i) Dean numbers ranging from 3.6 to 207.1, ii) Annulus dimension ratios of 5.5, 3.8, 2.9 and 2.36, and iii) Prandtl number of 0.7. In this regard, local entropy generation as well as overall entropy generation in the whole flow field has been analyzed in detail. Moreover, the effects of Dean number and annulus dimension ratio on entropy generation arising from the friction and heat transfer have been investigated. Accordingly, it is concluded that the effect of volumetric entropy generation that is a result of fluid frictional irreversibility can be neglected as compared with volumetric entropy generation due to heat transfer irreversibility. As Dean number increases, the distribution of volumetric entropy generation coming out from the heat transfer irreversibility is formed by the temperature field, which is depending on the curvature.