Fen - Edebiyat Fakültesi

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Citation Count: 4
Atomic Force Microscopy and Spectroscopy Studies of Annealed Ce/Ti Mixed Oxide Thin Films Prepared by Sol-Gel Process
(Elsevier Science Bv, 2006) Ghodsi, Farhad E.; Tepehan, Fatma Zehra; Tepehan, Galip Gültekin
Mixed Ce/Ti/Zr oxide thin films with a molar ratio of 0.5:0.25:0.25 were prepared using the sol-gel process and deposited on glass substrates by the dip coating technique. The effect of heat treatment temperature on surface morphology of the films was examined by atomic force microscopy AFM. The optical transmittance and reflectance of the films were measured over the spectral range from 350 to 1000 nm. The refractive index and extinction coefficient and thickness of the films were determined as a function of the heat treatment temperature. The refractive index increased from 1.51 to 2.02 at lambda = 600 nm and the extinction coefficient values increased from 0.006 to 0.094 while the thickness of the films decreased from 81 nm to 45 nm when annealing temperature increased from 100 degrees C to 500 degrees C. The results show that the optical properties and surface morphology of the mixed Cc/Ti/Zr oxide thin films were affected by annealing temperature. (c) 2006 Elsevier B.V. All rights reserved.
Citation Count: 0
Bayesian and Graph Theory Approaches To Develop Strategic Early Warning Systems for the Milk Market
(Springer-Verlag Berlin, 2015) Gürpınar, Furkan; Bisson, Christophe; Diner, Öznur Yaşar
This paper presents frameworks for developing a Strategic Early Warning System allowing the estimatation of the future state of the milk market. Thus this research is in line with the recent call from the EU commission for tools which help to better address such a highly volatile market. We applied different multivariate time series regression and Bayesian networks on a pre-determined map of relations between macro economic indicators. The evaluation of our findings with root mean square error (RMSE) performance score enhances the robustness of the prediction model constructed. Finally we construct a graph to represent the major factors that effect the milk industry and their relationships. We use graph theoretical analysis to give several network measures for this social network
Citation Count: 5
Double Branch Outage Modeling and Its Solution Using Differential Evolution Method
(2011) Ceylan, Oğuzhan; Ozdemir, Aydogan; Dağ, Hasan
Power system operators need to check the system security by contingency analysis which requires power flow solutions repeatedly. AC power flow is computationally slow even for a moderately sized system. Thus fast and accurate outage models and approximated solutions have been developed. This paper adopts a single branch outage model to a double branch outage one. The final constrained optimization problem resulted from modeling is then solved by using differential evolution method. Simulation results for IEEE 30 and 118 bus test systems are presented and compared to those of full AC load flow in terms of solution accuracy. © 2011 IEEE.
Citation Count: 0
Electromagnetic Interactions of Heavy Ions at Small Impact Parameters and Lepton Pair Productions
(Institute of Physics Publishing, 2011) Güçlü, Mehmet Cem; Yılmaz Şengül, Melek
In peripheral collisions the strong electromagnetic fields are produced since the fully stripped heavy ions moves at ultra-relativistic velocities. Lepton pairs especially the electron-positron pairs are the result of this collisions. At the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC) virtual photons produce many particles such as electron-positron pairs heavy lepton (muons and tauons) pairs magnetic monopoles W-pairs b-quark pairs and possibly the Higgs. At small impact parameters the colliding nuclei make peripheral collisions photon fluxes are very large and these are responsible for the multiple photonuclear interactions. Free pair productions bound free pair productions and nuclear Coulomb excitations are important examples of such interactions and these processes play important roles in the beam luminosity at RHIC and LHC. Here we obtained bound free electron-positron pair production with nuclear breakup for heavy ion collisions at RHIC and LHC.
Citation Count: 2
Jonson and the Alchemical Economy of Desire: Creation Defacement and Castration in the 'alchemist
(Univ Paul Valery, 2002) Meskill, Sermin Lynn
Behind images of Ben Jonson as the virtuous centred stoic writer lie the traces of a morbid fear concerning the fate of the poet's creation and name. The Jonsonian oeuvre reveals a fear of the ultimate defacement and effacement of the writer's ephemeral text. A prophylactic strategy of auto-critique as well as borrowing and even plagiarism from established literary sources point to the desire to control the critical reception of the writer's works and guarantee the terms of his own posterity. In The Alchemist this urge to control literary inheritance is reflected in the struggle between a 'father' alchemist and his apprentice 'son' for claims to authority: it is played out as a family romance in what might be called a 'maidenheadless' plot as opposed to the romantic courtship plot perfected by the father and rival Shakespeare. The son's struggle for authority may be seen in terms of the writer's fantasy of acquiring the virile power of the literary antecedent as talisman against the power of envy to deface poetic creation and name. The need to 'save face' in the complicated and tricky game of inheriting the mantle of the father is literally figured in Face's attempt to steal the playhouse cloak of Hieronimo of Kyd's The Spanish tragedy in an extraordinary example of literary mise en abime.
Citation Count: 7
On Sectional Curvatures of a Weyl Manifold
(2006) Özdeğer, Abdülkadir
In this paper it is proved that if at each point of a Weyl manifold the sectional curvature is independent of the plane chosen then the Weyl manifold is locally conformal to an Einstein manifold and that the scalar curvature of the Weyl manifold is prolonged covariant constant.
Citation Count: 0
On the Inverse Point-Source Problem of the Poisson Equation
(Istanbul University, 2005) Yılmaz, Melek; Şengül, Metin Y.; Geçkinli, Melih
In this work a basic inverse heat conduction problem of a simple 2-D model with steady state heat source is taken into view. The physical problem is for a square region with uniform thermophysical properties and a point heat source of unit magnitude. To obtain boundary data temperature probes are placed at the midpoints of the sides of the square domain. The objective of the inverse problem is to estimate the coordinates of the point source with the least amount of data. Initially the inverse problem is analyzed to determine the main causes that render the problem ill conditioned. As for the solution among the methods that has been tried so far the best results are obtained from a backpropagating ANN with four-probe data. When white Gaussian noise is added to the measurements no catastrophic failure has been observed.
Citation Count: 22
Selective Liquid-Liquid Extraction of Mercuric Ions by Octyl Methane Sulfonamide
(Marcel Dekker Inc, 2003) Bıçak, Niyazi; Sungur, Sana; Gazi, Mustafa; Tan, Nükhet
N-octyl methane sulfonamide (OMSA) has been demonstrated to be a very efficient reagent for selective extraction of Hg(II) ions from aqueous solutions. The extraction bases on rapid reaction of OMSA with Hg(II) ions yielding mono and disulfonamido mercury compounds in ordinary conditions. Solubility of OMSA and its mercury compounds in 2-ethyl hexanol provide a clear-cut phase separation in the extraction. The solution of OMSA in 2-ethyl hexanol (0.4 mol L-1) is able to extract 82.2% of mercuric-acetate (0.4 mol L-1) in non-buffered conditions. Although the process depends on the nature of accompanying anions the distribution coefficient is reasonably high (k(d) greater than or equal to 1.27) even in the presence of chloride ions. The extraction is strictly selective and the presence of Cd(II) Zn(II) Pb(II) do not bring any interference. The extraction system works in moderate concentrations. Extracted mercury in the organic phase can be recovered by back-extraction with concentrated HCl or H2SO4 solutions. After acid treatment the organic solution of OMSA becomes regenerated without losing its activity due to reasonable hydrolytic stability of the sulfonamide linkage and it can be recycled for further extractions.
Citation Count: 0
Strangers To and Producers of Their Own Culture: American Popular Culture and Turkish Young People
(2010) O'Neil, Mary Lou; Güler, Fazil
American popular culture is virtually everywhere including Turkey. Turkey is a close ally of the United States and American cultural products have long been present in Turkey. How does the presence of American popular culture in Turkey affect young people? Employing a series of focus groups comprised of Turkish university students we explored the meanings they attach to American popular culture and the place it has in their lives. What emerged was a portrait of Turkish young people constructing themselves and their imaginations from a multiplicity of traditions including American into an ever changing shifting whole. The Turkish young people in this study seem to exemplify this as they blend their lives not always easily or smoothly around Turkish American European and numerous other cultures. © W. S. Maney & Son Ltd 2010.
Citation Count: 0
Translation as the Sine Qua Non in Modern American Poetics
(Palacky Univ, 2014) Kenne, Mel
This essay is based largely on the theory of translation set forth by Walter Benjamin in the 1923 essay "The Task of the Translator," which introduced his translation of Baudelaire's "Tableaux parisiens." It attempts to show that modernist and postmoderhist American poetry, beginning with the symbolist movement in America concurrent with Ezra Pound and T. S. Eliot's seminal poetic texts that initiated the imagist movement and the high modernist style of writing, conform to Benjamin's ideas about "a pure language" and translation as a means of renewing the language. The argument hinges on the idea implied by Benjamin that translation may be defined as much more than the rewriting of a text in another language and that all writing may be viewed as a form of translation: a process, that is, of recreating or renewing a language through the translation of an "original" text which has "ripened" to the point that it becomes a vehicle for furthering the linguistic possibilities of the "target" language. It concludes by showing how these early to mid-twentieth-century movements culminated in the group of postmodernist poets who became known as "The New York School," with a particular focus on the poetry of John Ashbery, Kenneth Koch, and Frank O'Hara, the three poets who found their own styles and voices to a large extent through their reading and translation of French poets who were heirs to the symbolists.

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