Yazar "Işık Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü" için listeleme
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Component resolved OSL dose response and sensitization of various sedimentary quartz samples
Güneç Kıyak, Nafiye; Polymeris, George S.; Kitis, George (Elsevier Ltd, 2007-02)The structure of the linearly modulated optically stimulated luminescence (LM-OSL) signal was studied for four sedimentary quartz samples, collected from different sites around Istanbul, Turkey. Applying a computerized ... -
Component-resolved thermal stability and recuperation study of the LM-OSL curves of four sedimentary quartz samples
Kitis, George; Polymeris, George S.; Güneç Kıyak, Nafiye (Elsevier Ltd, 2007-09)Thermal stability as well as recuperation stands among the crucial general characteristics of different OSL components in quartz. Through a series of thermal stability and recuperation experiments, in conjunction with curve ... -
The conformal Penrose limit and the resolution of the pp-curvature singularities
Güven, Rahmi (IOP Publishing, 2006-01-21)We consider the exact solutions of the supergravity theories in various dimensions in which the spacetime has the form M-d x SD-d where M-d is an Einstein space admitting a conformal Killing vector and SD-d is a sphere of ... -
The conformal Penrose limit: back to square one
Güven, Rahmi (IOP Publishing LTD, 2008-08-21)We show that the conformal Penrose limit is an ordinary plane wave limit in a higher dimensional framework which resolves the spacetime singularity. The higher dimensional framework is provided by Ricci-flat manifolds which ... -
Constructing quantum logic gates using q-deformed harmonic oscillator algebras
Altıntaş, Azmi Ali; Özaydın, Fatih; Yeşilyurt, Can; Buğu, Sinan; Arık, Metin (Springer, 2014-04)We study two-level q-deformed angular momentum states, and using q-deformed harmonic oscillators, we provide a framework for constructing qubits and quantum gates. We also present the construction of some basic one-qubit ... -
The correlation of fast OSL component with the TL peak at 325 degrees C in quartz of various origins
Kitis, George; Güneç Kıyak, Nafiye; Polymeris, George S.; Tsirliganis, Nestor C. (Elsevier Science BV, 2010-02)The fast component of the optically stimulated luminescence (OSL) signal in quartz is the basic tool for the optical dating. Its relation with the thermoluminescence (TL) glow-peak at about 325 degrees C is well established ... -
Critical behavior of thermal phase transitions of iota-carrageenan in CaCl2 solution
Özbek, Haluk; Pekcan, Mehmet Önder (Elsevier B.V., 2006-07-15)In situ photon transmission method was applied to study thermal phase transitions of ?-carrageenan in CaCl2 solution. Coil-to-helix (c-h) and helix-to-dimer (h-d) transitions were detected upon cooling. An extra dimer-to-dimer ... -
Dating fossil root cast (Black Sea coast, Turkey) using thermoluminescence: Implications for windblown drift of shelf carbonates during MIS 2
Polymeris, George S.; Kitis, George; Güneç Kıyak, Nafiye; Theodosoglou, Eleni; Tsirliganis, Nestor C.; Ertek, Topçu Ahmet; Erginal, Ahmet Evren (Elsevier Ltd., 2016-05-16)Rhizoliths are mostly sub-aerially exposed root prints which appear through removal of the rock units that cap them. A horizontal-lying residual of a rhizolith, consisting purely of soft inner core material of white color ... -
Determination of pre-gelation and post-gelation activation energies during free radical crosslinking copolymerization
Kaya Aktaş, Demet; Pekcan, Mehmet Önder (Taylor & Francis Ltd, 2005)Steady-state fluorescence (SSF) and dilatoraetric techniques were used to study the free-radical crosslinking copolymerization (FCC) of styrene (S) and divinylbenzene (DVB) in bulk. The gel points (t g) were recorded by ... -
Did amphistegina lobifera Larsen reach the mediterranean via the Suez Canal?
Engin, Meriç; Yokeş, Mehmet Baki Aki; Avşar, Niyazi; Güneç Kıyak, Nafiye; Öner, Ertuğ; Nazik, Atike; Demirtaşlı, Erdoğan; Dinçer, Feyza; Öztürk, Muhammed Zeynel (Elsevier Ltd., 2016-05-16)It has been accepted by many researchers that Amphistegina lobifera Larsen migrated to the Mediterranean Sea via Suez Canal like many other Indo-Pacific originated foraminifers and organisms. This idea was also supported ... -
Differential uplift along the northern margin of the Central Anatolian Plateau: inferences from marine terraces
Yıldırım, Cengiz; Melnick, Daniel; Ballato, Paolo; Schildgen, Taylor F.; Echtler, Helmut P.; Erginal, Ahmet Evren; Güneç Kıyak, Nafiye; Strecker, Manfred (Pergamon-Elsevier Science LTD, 2013-12-01)Emerged marine terraces and paleoshorelines along plate margins are prominent geomorphic markers that can be used to quantify the rates and patterns of crustal deformation. The northern margin of the Central Anatolian ... -
Dissipative dynamics and the statistics of energy states of a Hookean model for protein folding
Tüzel, Erkan; Erzan, Ayşe (Kluwer Academic Publishers-Plenum Publishers, 2000-07)A generic model of a random polypeptide chain, with discrete torsional degrees of freedom and Hookean spring connecting pails or hydrophobic residues, reproduces the energy probability distribution of real proteins over a ... -
Dissolution and subsequent re-crystallization as zeroing mechanism, thermal properties and component resolved dose response of salt (NaCl) for retrospective dosimetry
Polymeris, George S.; Kitis, George; Güneç Kıyak, Nafiye; Sfamba, Ioanna; Subedi, Bhagawan; Pagonis, Vasilis (Pergamon-Elsevier Science Ltd, 2011-09)In the present study we report dosimetric properties of iodized salt aiming at using it as an accidental luminescent dosimeter. It was found that the very good sensitivity of its main dosimetric peak is strongly affected ... -
Dissolution of Al2O3-polystyrene latex composites: A fluorescence study
Uǧur, Şaziye; Tepehan, Fatma Zehra; Pekcan, Mehmet Önder (Taylor & Francis Ltd, 2005)This work reports the use of the steady state fluorescence (SSF) technique to study dissolution of a composite film formed from a mixture of Al 2O3 and polystyrene (PS) latex particles. The composite films were cast from ... -
Doç. Dr. İsmail Karakurt
Işık Üniversitesi; Karakurt, İsmail; Işık Üniversitesi; Işık Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü (Işık Üniversitesi, 2011-07-08)Işık Üniversitesi Fen Edebiyat Fakültesi Fizik Bölümü Öğretim Üyesi Doç. Dr. İsmail Karakurt'un, Fizik Bölümü hakkında bilgi verdiği videonun erişimidir. -
Drying of PAAm hydrogels at various temperatures: A fluorescence study
Aktaş, Demet Kaya; Evingür, Gülşen Akın; Pekcan, Mehmet Önder (Taylor & Francis Group, 2007-05)The steady-state fluorescence (SSF) technique was employed for studying the drying of polyacrylamide (PAAm) hydrogels. Disc-shaped hydrogels were prepared by free-radical crosslinking copolymerization of acrylamide (AAm) ... -
Effect of annealing rate on film formation from poly(vinyl acetate) latex particles
Arda, Ertan; Kara, Selim; Pekcan, Mehmet Önder (Taylor & Francis Ltd, 2008)The photon transmission technique was used to monitor the time and temperature evolution of film formation from poly(vinyl acetate) (PVAc) latex particles. The latex films were prepared below the glass transition temperature ... -
Effect of annealing temperature on determining trap depths of quartz by various heating rates method
Güneç Kıyak, Nafiye; Buluş, E. (Pergamon-Elsevier Science, 2001-12)The aim of this study is to determine the trap parameters (trap depth E, frequency factors) of quartz using various heating rates method and also to investigate the effect of annealing temperature on determining trap depths. ... -
The effect of clay particles on film formation from polystyrene latex
Uğur, Şaziye; Alemdar, Ayşe; Pekcan, Mehmet Önder (Wiley, 2006-06)Film formation from surfactant-free polystyrene (PS) latex was performed in the presence of 5% Na-montmorillonite (NaMMT). The composite films were prepared from pyrene (P)-labeled PS particles at room temperature and ... -
Effects of annealing on morphology of polymer/polymer (PS/PMMA) blend; a fluorescence study
Uğur, Şaziye; Pekcan, Mehmet Önder (John Wiley& Sons Inc, 2006-05-05)Steady state fluorescence (SSF) technique conjunction with optical microscopy were used to study the morphology of polystyrene (PS)/poly(methyl methacrylate) (PMMA) blend upon annealing above glass transition in elevated ...