405 research outputs found
Coupled fixed point theorems for mixed g-monotone mappings in partially ordered metric spaces
No full textIn this paper, we prove some coupled coincidence point results for mixed g-monotone mappings in partially ordered metric spaces. The main results of this paper are generalizations of the main results of Luong and Thuan (Nonlinear Anal. 74:983-992, 2011). ©2013 Turkoglu and Sangurlu; licensee Springer
An existence theorem for the common solutions for a pair of integral inclusions
No full textIn this paper we prove an existence theorem for the common solutions for a pair of integral inclusions via a common fixed point theorem of Turkoglu et al.[10]. © 2011 Watam Press
Novel Hybrid Scaffolds for the Cultivation of Osteoblast Cells
No full textTurkoglu Sasmazel, Hilal/0000-0002-0254-4541In this study, natural biodegradable polysaccharide, chitosan, and synthetic biodegradable polymer, poly(epsilon-caprolactone) (PCL) were used to prepare 3D, hybrid polymeric tissue scaffolds (PCL/chitosan blend and PCL/chitosan/PCL layer by layer scaffolds) by using the electrospinning technique. The hybrid scaffolds were developed through HA addition to accelerate osteoblast cell growth. Characteristic examinations of the scaffolds were performed by micrometer, SEM, contact angle measurement system, ATR-FTIR, tensile machine and swelling experiments. The thickness of all electrospun scaffolds was determined in the range of 0.010 +/- 0.001-0.012 +/- 0.002 mm. In order to optimize electrospinning processes, suitable bead-free and uniform scaffolds were selected by using SEM images. Blending of PCL with chitosan resulted in better hydrophilicity for the PCL/chitosan scaffolds. The characteristic peaks of PCL and chitosan in the blend and layer by layer nanofibers were observed. The PCL/chitosan/PCL layer by layer structure had higher elastic modulus and tensile strength values than both individual PCL and chitosan structures. The layer by layer scaffolds exhibited the PBS absorption values of 184.2; 197.2% which were higher than those of PCL scaffolds but lower than those of PCL/chitosan blend scaffolds. SaOs-2 osteosarcoma cell culture studies showed that the highest ALP activities belonged to novel PCL/chitosan/PCL layer by layer scaffolds meaning better cell differentiation on the surfaces. (C) 2011 Elsevier B.V. All rights reserved.Turkish Academy of Science (TUBA) L'Oreal; L'OrealThe author is greatly thankful to Turkish Academy of Science (TUBA) & L'Oreal for honoring this study with the award "Young Women in Science" in Materials Science in 2009. Her special thanks also go to L'Oreal for the precious financial support. The author also appreciates the invaluable contribution of AWAC (Academic Writing Advisory Center) to this study in linguistic terms
Turkish truffles I: 18 new records for Turkey
No full textWOS: 000352486200014We report the first records of 18 truffle species in Turkey. Three belong to the Ascomycota: Elaphomyces leucocarpus, E. muricatus, and Genea sphaerica; and 15 to the Basidiomycota: Alpova corsicus, Gautieria otthii, G. retirugosa, G. trabutii, Hymenogaster citrinus, H. hessei, H. luteus, H. lycoperdineus, Hysterangium clathroides, H. epiroticum, H. fragile, H. nephriticum, Leucogaster tozzianus, Octaviania asterosperma, and Protoglossum aromaticum. We also report new localities within Turkey for Picoa juniperi, P. lefebvrei, Geopora cooperi, Terfezia arenaria, T. claveryi, Tuber aestivum, and T. nitidum in the Ascomycota; and Leucogaster nudus, Hymenogaster thwaitesii, H. vulgaris, and Melanogaster broomeanus in the Basidiomycota.Scientific and Technological Research Council of Turkey projectTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [T-BAG-111T530, BIDEB-2221]The first author received funding from the Scientific and Technological Research Council of Turkey project number T-BAG-111T530 and BIDEB-2221. We appreciate the help from Abdulkadir Simsek, Ahmet Oksuzoglu, Cemhan Bucak, Coskun Bilgi, Duran Celik, Ekrem Toprak, Esra Er, Fatih Kaya, Gulsum Turkoglu, Idris Sener, Kadir Bazlica, Kadir Ceryan, Mehmet Halil Solak, Mehmet Metin, Mehmet Yucel, Murat Kilic, Mustafa Demir, Mustafa Turuncoglu, Niyazi Ulucoban, Okan Kursun, Osman Coban, Serkan Sevinc, Seyit Ahmet Akay, Tolga Keser, Ugur Demirbilek, Veysel Kodalak, and Yavuzalp Turkoglu in the collection of some of the specimens
Fixed point theorem for a generalized contractive fuzzy mapping
No full textExistence of a fixed point for a fuzzy mapping satisfying a generalized contractive condition is proved. Our result, supported with an example, provide extension as well as substantial improvements of several well known results in the existing literature. © 2014 IOS Press and the authors
Some fixed point results in complete generalized metric spaces
No full textThe Banach contraction principle is the most important result. This principle has many applications and some authors was interested in this principle in various metric spaces as Brianciari.
The author initiated the notion of the generalized metric space as a generalization of a metric space by replacing the triangle inequality by a more general inequality, for all pairwise distinct points of . As such, any metric space is a generalized metric space but the converse is not true. He proved the Banach fixed point theorem in such a space. Some authors proved different types of fixed point theorems by extending the Banach's result. Wardowski introduced a new contraction, which generalizes the Banach contraction. He using a mapping introduced a new type of contraction called -contraction and proved a new fixed point theorem concerning -contraction. In this paper, we have dealt with -contraction and -weak contraction in complete generalized metric spaces. We prove some results for -contraction and -weak contraction and we show that the existence and uniqueness of fixed point for satisfying -contraction and -weak contraction in complete generalized metric spaces. Some examples are supplied in order to support the useability of our results. The obtained result is an extension and a generalization of many existing results in the literature
SOME MECHANICAL AND PHYSICAL PROPERTIES OF AD-KD 5 IMPREGNATED AND THERMALLY MODIFIED SCOTS PINE WOOD
No full textDEGIRMENTEPE, Selim/0000-0002-3686-4551; Turkoglu, Turkay/0000-0003-2011-0410WOS: 000337934300007The purpose of this study is to determine some mechanical properties such as modulus of rupture (MOR) and some physical properties such as glossiness, color, surface roughness, and water absorption (WA) of adolit-KD 5 (AD-KD 5) impregnated and then heat treated of Scots pine (Pinus sylvestris L.) wood specimens. Heat treatment of Scots pine (Pinus sylvestris L.) wood was carried out by hot air in an oven for 2, 4, and 8 h at 150 and 175 C. Before the heat treatments, wood specimens were impregnated with 3% aqueous solution of AD-KD 5 which is a copper based chemical according to ASTM D 413-76. While MOR, glossiness, and colors of wood specimens impregnated with AD KD 5 were lower than that of the un-impregnated control specimen, WA of Scots pine impregnated with AD KD 5 was higher than that of the un-impregnated control specimen before heat treatments. Also, AD KD 5 impregnation caused an increase in surface roughness of Scots pine before the heat treatments. Results showed that oven heat-treated wood became darker in tone.While, a* coordinate (red component) increased as temperature increased, b* coordinate decreased at temperatures tested. As a result of heat treatment, a decrease was observed in MOR, WA, glossiness, and surface roughness of Scots pine wood specimens. Moreover, increasing treatment temperature and duration, resulted in decreasing values of MOR, WA, glossiness, and surface roughness
Student activism and the pandemic: a global round-up
No full textThe COVID-19 pandemic led to far-reaching changes in higher education globally, yet student activism continued to be a force to be reckoned with. Key concerns and commitments remained student funding; equality, social justice, and antidiscrimination; political freedoms and democracy; and gender equality. The single biggest cause of protests was, however, the pandemic itself. Recent additions to the protest agenda include climate change, academic freedom, and the Russian invasion of Ukraine.
Some common fixed point theorems for weakly compatible mappings in uniform spaces
No full textWe prove new common fixed point theorems for weakly compatible mappings on uniform spaces. Also, an application to locally convex spaces is presented
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