Yazar "Coşkun, Mahmut" seçeneğine göre listele

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    Applicability of noninteger bessel type orbital basis sets: numerical and analytical approaches
    (Springer Science and Business Media Deutschland GmbH, 2023) Coşkun, Mahmut; Ertürk, Murat
    Recently, usefulness of the noninteger principal quantum numbers for Bessel type orbitals was discussed by Weniger in (Adv Quant Chem 83:209–237, 2021). In this study, we analyzed the applicability and numerical accuracy of basis sets of noninteger Bessel type orbitals to electronic structure calculations. Both numerical and analytical approaches are applied to two-electron atomic systems. The results of the numerical test demonstrated the potential of the noninteger values of principal quantum number for the improving of Bessel type functions approach in use of LCAO methods. Nevertheless, the analytical approach is still not suitable and in development and needs to be investigated further.The performance of the presented basis functions is also compared to the numerical Hartree–Fock results.
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    Çanakkale çevresinde toplanan biyoindikator organizma Cladonia rangiformis'de bazı element konsantrasyonları
    (2008) Çayır, Akın; Coşkun, Münevver; Coşkun, Mahmut
    Al, Ba, Ca, Co, Fe, K, Li, Mg, Mn, Na, Ni ve Ti elementlerinin likendeki (Cladonia rangiformis) konsantrasyonlarını ve Çanakkale çevresindeki dağılımlarını belirlemek amacıyla 10 istasyonda örnekler toplanmıştır. Liken örneklerinin mineralizasyonu için mikrodalga çözme sistemi kullanılmıştır. Elementlerin konsantrasyonları ICP-OES ile belirlenmiş ve her bir elemente ait bölgesel dağılım haritaları çizilmiştir. Sonuçlar, çalışma alanında Al, Fe, Ti, Co ve Li'un dağılımlarının benzer olduğunu göstermiştir. Bu beş elemente ait en yüksek konsantrasyonlar Balıkesir-Balya çevresinde ölçülmüştür. Ayrıca Na, Mg, Ca ve Sr dağılımlarının benzer olduğu ve en yüksek konsantrasyonlarının denize yakın örnekleme istasyonlarında olduğu belirlenmiştir.
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    Concentrations of some elements in the bioindicator organism Cladonia rangiformis collected at the vicinity of Çanakkale
    (Ekoloji, 2008) Çayir, Akin; Coşkun, Münevver; Coşkun, Mahmut
    Lichen samples (Cladonia rangiformis) were collected at 10 different sampling sites to determine distribution patterns and concentrations of Al, Ba, Ca, Co, Fe, K, Li, Mg, Mn, Na, Ni, and Ti in lichen at the vicinity of Çanakkale. Microwave digestion system was used for mineralization of lichen samples. The concentrations of elements were determined using ICP-OES and the map of spatial distribution of each element's was plotted. Results showed that the distribution patterns of Al, Fe, Ti, Co, and Li were similar in the study area. The highest concentrations of these five elements were determined in Balikesir-Balya region. The distribution of Na, Mg, Ca, and Sr were also similar, and the maximum concentrations of these elements were determined near the sea shore sampling stations.
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    Corrigendum to “Spatial distribution and isotopic signatures of N and C in mosses across Europe” [Sci. Total Environ. 958 (2025) 178043](S0048969724082007)(10.1016/j.scitotenv.2024.178043)
    (Elsevier B.V., 2025) Izquieta-Rojano, Sheila; Morera-Gómez, Yasser; Elustondo, David; Lasheras, Esther; Santamaría, Carolina; Torrens-Baile, Julen; Alber, Renate; Coşkun, Mahmut; Coşkun, Münevver
    The authors regret that the printed version of the above article contained two errors in the author list. The correct and final version of the author list and their corresponding affiliations follows. The added authors are Winfried Schröder and Harald G. Zechmeister. These individuals provided both samples and data from previously analyzed samples, and contributed to the initial manuscript draft. The authors would like to sincerely apologize for any inconvenience caused and greatly appreciate the understanding of the two authors mistakenly included and the two authors initially omitted. Sheila Izquieta-Rojanoa, Yasser Morera-Gómeza, David Elustondoa, Esther Lasherasa, Carolina Santamaríaa, Julen Torrens-Bailea, Renate Alberb, Lambe Barandovskic, Mahmut Coşkund, Munevver Coskune, Helena Danielssonf, Ludwig De Temmermang, Harry Harmensh, Zvonka Jerani, Sébastien Leblondj, Javier Martínez-Abaigark, Encarnación Núñez-Oliverak, Winfried Schröderl, Gunilla Pihl Karlssonf, Juha Piispanenm, Harald G. Zechmeistern, Zdravko Spirico, Trajče Stafilovc, Lotti Thönip, Jesús Miguel Santamaríaa aUniversidad de Navarra, Instituto de Biodiversidad y Medioambiente BIOMA, Irunlarrea 1, 31008 Pamplona, Spain bAgency for Environment and Climate Protection, Biological Laboratory, Unterbergstr. 2, 39055 Leifers, Italy cInstitute of Physics, Faculty of Natural Sciences and Mathematics, Ss Cyril and Methodius University in Skopje, POB 162, 1000 Skopje, Macedonia dCanakkale Onsekiz Mart University, Faculty of Medicine, Turkey eCanakkale Onsekiz Mart University, Vocational Health School, Turkey fIVL - Swedish Environmental Research Institute, Sweden gVeterinary and Agrochemical Research Centre CODA-CERVA, Tervuren, Belgium hUK Centre for Ecology & Hydrology, Environment Centre Wales, Deiniol Road, Bangor, Gwynedd LL57 2UW, UK iJožef Stefan Institute, Ljubljana, Slovenia jPatriNat (OFB, MNHN), 12 Rue Buffon, CP39, 75005 Paris, France kUniversidad de La Rioja, Facultad de Ciencia y Tecnología, Madre de Dios 53, 26006 Logroño, Spain lChair of Landscape Ecology, University of Vechta, P.O.B. 1553, 49364 Vechta, Germany mNatural Resources Institute Finland, Paavo Havaksen tie 3, FI-90570 Oulu, Finland nUniversity of Vienna, Department of Biodiversity and Conservation Biology, Rennweg 14, 1030 Vienna, Austria oGreen Infrastructure Ltd., Borongajska cesta 81c., HR-10000 Zagreb, Croatia pFUB - Research Group for Environmental Monitoring, Alte Jonastrasse 83, 8640 Rapperswil, Switzerland © 2025 The Author(s)
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    Karayosunu biyomonitoring tekniğini kullanarak doğu ve güney marmara bölgesi atmosferik ağır metal kirlilik haritasının oluşturulması
    (2006) Coşkun, Mahmut; Coşkun, Münevver; Çayır, Akın; Kılıç, Önder
    [Abstract Not Available]
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    Quality of drinking water of Canakkale province, Turkey
    (2012) Coşkun, Mahmut; Çayır, Akın; Coşkun, Münevver; Kovancı, Aslı
    Açılır açılmaz ve belir süre akıtıldıktan sonra alınan musluk suyu örneklerinde arsenik, kad miyum, bakır, kurşun ve çinko konsantrasyonları belirlenmiştir. Bununla birlikte musluk suyunun 3 dakika akıtılmasından sonra alınan su örneklerinin bakteriyolojik analizi yapılmıştır. Elde edilen sonuçlar, açılır açılmaz alınan 40 örnekte ve belli bir süre akıtıldıktan sonra alınan 40 örnekte Cd ve Pb konsantrasyonlarının çalışmada kullanılan analitik metodun deteksiyon limitinin altında olduğu görülmüştür. As, Cu ve Znnun konsantrasyon aralıkları sıra ile 0.95 - 11.9 ?g/L, 0.011 - 0.58 ve 0.04 - 5.29 mg/L olar ak bulunmuştur. Cu ve Znnun en düşük konsantrasyonları belli bir süre akıtıldıktan sonra alınan 40 örnekte saptanmış ve sıra ile 0.010 - 0.343 ve 0.008 - 4.546 mg/L olarak bulunmuştur. Bakteriyolojik analiz için alınan 40 örneğin 28inde aerobik mezofilik bakteri, 18inde coliform ve 1inde Escherichia coli saptanmıştır. Yüksek seviyede bakteri kolonileri oluşturan örneklerin 2 fakülteden, 1 kafeteryadan ve 1 ekmek fırınından alındığı saptanmıştır. Bu sonuçlar, Çanakkale içme suyu ve şebekesinin iyileştirme gereksinimi olduğunu göstermiştir.
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    Spatial distribution and isotopic signatures of N and C in mosses across Europe
    (Elsevier B.V., 2025) Izquieta-Rojano, Sheila; Morera-Gómez, Yasser; Elustondo, David; Lasheras, Esther; Santamaría, Carolina; Torrens-Baile, Julen; Alber, Renate; Coşkun, Mahmut
    The accumulation of nitrogen (N) in moss tissue has proven to be a reliable marker of increasing N deposition. However, this measurement does not offer additional data about the origin of pollution. In this respect, the analysis of the N isotopic ratios might be a helpful tool in providing supplementary information about the nature of the nitrogenous species in biomonitoring surveys. Furthermore, isotopic signatures have been extensively used in the study of N and carbon (C) biogeochemical cycles. The main purpose of this study was to determine N and C elemental contents and their stable isotopes in mosses to investigate atmospheric pollution patterns across Europe. We aimed at identifying the main N polluted areas and evaluating the potential use of isotopic signatures in the attribution of pollution sources at a regional scale. With these objectives in mind, >1300 samples from 15 countries from Europe, all of them participants of the ICP-Vegetation programme 2005–2006, were analyzed for their C and N contents and ?15N and ?13C. The results were compared to those derived from EMEP model, which provided modeled deposition and emission data, as well as to the predominant land uses at the sampling sites (based on CORINE Land Cover). This evaluation suggests that additional measurements of stable C and N isotopes in mosses could be a valuable tool in European environmental surveys. Such measurements not only provide useful information for identifying probable pollution sources but also enable the quantification of their contributions, serving as biological indicators of significant environmental processes. This study presents the first quantitative assessment of major atmospheric nitrogen (N) sources based on stable isotope analysis on a European scale, establishing a framework for evaluating historical changes in N across the region.
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    Toxic metals in the austrian pine (Pinus Nigra) bark in the Thrace Region, Turkey
    (Springer Netherlands, 2006) Coşkun, Mahmut
    Austrian pine (Pinus nigra) bark was collected in thirty-seven localities in the Thrace region, Turkey, for the determination of airborne toxic metal distribution. Five toxic metals, As, Cd, Cu, Pb, and Zn, were monitored using atomic absorption spectrometry. Distribution maps of toxic elements in the region were plotted according to Geographic Information System technology. In general, the concentrations of all investigated elements were not high in the region apart from the vicinity of big cities, Tekirdag, Istanbul and, close to Bulgarian border. However, the highest concentrations were not at pollution level. They have a similar distribution pattern throughout the region. © Springer Science+Business Media, Inc. 2006.