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Search Results: 1 - 10 of 461675 matches for " A. Cigdem Ozcan "
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Strongly J-Clean Rings with Involutions
Huanyin Chen,Abdullah Harmanci,A. Cigdem Ozcan
Mathematics , 2012,
Abstract: A ring with an involution * is called strongly $J$-*-clean if every element is a sum of a projection and an element of the Jacobson radical that commute. In this article, we prove several results characterizing this class of rings. It is shown that a *-ring $R$ is strongly $J$-*-clean, if and only if $R$ is uniquely clean and strongly *-clean, if and only if $R$ is uniquely strongly *-clean, that is, for any $a\in R$, there exists a unique projection $e\in R$ such that $a-e$ is invertible and $ae=ea$.
Strongly Nil-*-Clean Rings
Huanyin Chen,Abdullah Harmanci,A. Cigdem Ozcan
Mathematics , 2012,
Abstract: A *-ring $R$ is called a strongly nil-*-clean ring if every element of $R$ is the sum of a projection and a nilpotent element that commute with each other. In this article, we show that $R$ is a strongly nil-*-clean ring if and only if every idempotent in $R$ is a projection, $R$ is periodic, and $R/J(R)$ is Boolean. For any commutative *-ring $R$, we prove that the algebraic extension $R[i]$ where $i^2=\mu i+\eta$ for some $\mu,\eta\in R$ is strongly nil-*-clean if and only if $R$ is strongly nil-*-clean and $\mu\eta$ is nilpotent. The relationships between Boolean *-rings and strongly nil-*-clean rings are also obtained.
Validation of the Scales for Age Determination in a Cyprinid, Scardinius erythrophthalmus (L., 1758)
Cigdem Gursoy,Ali Serhan Tarkan,Hasan Acipinar,Ozcan Gaygusuz
International Journal of Zoological Research , 2005,
Abstract: In this study, scales were used to find out timing of annulus formation in Scardinius erythrophthalmus and following assumptions were tested; the existence of periodical marks, the ability to identify these marks correctly and to convert the number of marks into age. Time of annulus formation was derived from annual changes of opaque and hyaline zones on scale margins. Scales exhibited opaque and hyaline zones whose combination was formed once a year. Opaque zones appeared formed from July to February and the hyaline ones from March to June. A procedure is described to assess age by using the number of annuli, the condition of the scale edge and the capture data. The results of this study would be a useful guide for this species and also for other cyprinid species which is suitable for similar ageing techniques to improve precision of the age determination of fish.
Information Worth of MinMaxEnt Models for Time Series  [PDF]
Aladdin Shamilov, Cigdem Giriftinoglu
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.62021
Abstract: In this study, by starting from Maximum entropy (MaxEnt) distribution of time series, we introduce a measure that quantifies information worth of a set of autocovariances. The information worth of autocovariences is measured in terms of entropy difference of MaxEnt distributions subject to different autocovariance sets due to the fact that the information discrepancy between two distributions is measured in terms of their entropy difference in MaxEnt modeling. However, MinMaxEnt distributions (models) are obtained on the basis of MaxEnt distributions dependent on parameters according to autocovariances for time series. This distribution is the one which has minimum entropy and maximum information out of all MaxEnt distributions for family of time series constructed by considering one or several values as parameters. Furthermore, it is shown that as the number of autocovariances increases, the entropy of approximating distribution goes on decreasing. In addition, it is proved that information worth of each model defined on the basis of MinMaxEnt modeling about stationary time series is equal to sum of all possible information increments corresponding to each model with respect to preceding model starting with first model in the sequence of models. The fulfillment of obtained results is demonstrated on an example by using a program written in Matlab.
Genetic Analysis for Milk Traits in Different Herds of Holstein Friesian Cattle in Turkey
H?lya Atil,A. Salah Khattab,Cigdem Yakupoglu
Journal of Biological Sciences , 2001,
Abstract: A total of 5093 lactation records of Holstein Friesian cows sired by 181 bulls kept at five herds in West of Turkey during the period from 1972 to 1987 were used to estimate phenotypic and genetic parameters for 305 day milk yield (305 dMY), lactation period (LP) and days open (DO). In addition, sire transmitting ability for these traits studied were also examined. Least squares analysis of variance showed significant effect of herds, season of calving, year of calving and parity on all traits studied, except the effect of season of calving on lactation period. Including age at calving as a polynomial regression of the second degree in the model yielded significant partial linear and quadratic regression of 305 dMY on age at calving, while the effect of age at calving on LP were not significant. In addition, days open had a significant effect on 305 dMY and LP. Sires within herds and cows within herds within sires were significant effect on most traits studied. Heritability estimates were 0.38 + 0.06, 0.13 + 0.03 and 0.007 + 0.02 for 305 dMY, LP and DO, respectively. All phenotypic and genetic correlations among all traits studied were positive and significant (P < 0.01), while, the genetic correlation between 305 dMY and DO was negative. Sires with at least 10 daughters were evaluated by using best linear unbiased prediction (BLUP), sire transmitting ability ranged from -717 to 601 kg for 305 dMY, from -24 to 40 d for LP and from -5 to 6 d for DO. Sires give positive and higher BLUP values for 305 dMY give positive BLUP values for LP and negative BLUP values for DO.
Unintentional F doping of the surface of SrTiO3(001) etched in HF acid -- structure and electronic properties
Scott A. Chambers,Timothy C. Droubay,Cigdem Capan,Guangyuan Sun
Physics , 2011, DOI: 10.1016/j.susc.2011.11.029
Abstract: We show that the HF acid etch commonly used to prepare SrTiO3(001) for heteroepitaxial growth of complex oxides results in a non-negligible level of F doping within the terminal surface layer of TiO2. Using a combination of x-ray photoelectron spectroscopy and scanned angle x-ray photoelectron diffraction, we determine that on average ~13 % of the O anions in the surface layer are replaced by F, but that F does not occupy O sites in deeper layers. Despite this perturbation to the surface, the Fermi level remains unpinned, and the surface-state density, which determines the amount of band bending, is driven by factors other than F doping. The presence of F at the STO surface is expected to result in lower electron mobilities at complex oxide heterojunctions involving STO substrates because of impurity scattering. Unintentional F doping can be substantially reduced by replacing the HF-etch step with a boil in deionized water, which in conjunction with an oxygen tube furnace anneal, leaves the surface flat and TiO2 terminated.
Valuing Health Effects of Natural Radionuclides Releases from Yatagan Power Plant  [PDF]
Tayfun BUKE, Aylin CiGdem KONE
Energy and Power Engineering (EPE) , 2010, DOI: 10.4236/epe.2010.21008
Abstract: The objective of this paper is the valuation of radiological health effects of Yatagan Power Plant. To this aim the radiation dose calculations are carried out for the population living within 80 km radius of the plant. The average of the maximum measured specific isotopes 238U, 232Th and 226Ra in the flying ash samples are considered as radioactive sources. Based on the dose calculations, first the stochastic health effects and then monetary health effects are estimated. The estimated total collective dose and economic value of the pre-dicted health effects are 0.3098 man Sv/y and 14791 US$/y respectively. The results obtained from the dose calculations are lower than the limits of International Commission of Radiation Protection (ICRP) and it does not pose any risk for public health. Monetary value of health risks is also negligible in comparison to the av-erage yearly sales revenue of the plant which is 250 million US$.
An Innovative Description of Elastic Constant Tensor Based upon Orthonormal Representations
Cigdem Dinckal
Lecture Notes in Engineering and Computer Science , 2012,
On The Properties of Anisotropic Engineering Materials Based upon Orthonormal Representations
Cigdem Dinckal
IAENG International Journal of Applied Mathematics , 2012,
Developing a Public Open Space Network: A Case Study in Ortaca District (Mugla, Turkey)
Cigdem Kilicaslan
Journal of Applied Sciences , 2006,
Abstract: Enclosed with agricultural lands, Ortaca is well known with its holiday resorts such as Sarigerme with a long coastal strip and Dalyan with the sea turtles and the rock graves of the ancient city of Kaunos. In line with recent policies aimed at opening the region to tourism, Ortaca is growing fast and unplanned. The starting point of this study is the unplanned, insufficient, divided and disconnected public open spaces of Ortaca which are far away to respond the requirements of people. In this context; the purpose of this study is to argue out entirely the public open spaces of Ortaca district to redevelop the image of the town and to make a progress in the physical, cultural and socio economical structure.
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