Scopus İndeksli Yayınlar Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12469/1248

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Citation - WoS: 1
Citation - Scopus: 1
The Associations Between Deviation From the Balanced Time Perspective and Depression and Anxiety: The Moderator Role of Mindfulness in a Two-Wave Study
(Sage Publications inc, 2025) Altan-Atalay, Ayse; Ranjbar, Hamed Abdollahpour; Altintas, Seda
Deviation from the balanced time perspective (DBTP) refers to difficulties in switching between different time frames in a flexible way by considering the situational demands. DBTP is associated with higher levels of depression and anxiety. Mindfulness acts as a protective mechanism against depression and anxiety. The current study examined the moderator role of mindfulness in the relationship between DBTP and psychological distress. The participants were 243 university students (53.09% women) between ages 18 and 29 (M = 19.88, SD = 1.42) who answered self-report measures of time perspective, mindfulness, anxiety, and depression at two-time points with a five-week time interval. The results showed that the interaction between DBTP and mindfulness measured at time one could prospectively predict both anxiety and depression measured at time two. Mindfulness plays a significant moderating role in the relationship between DBTP and anxiety and depression. The data indicate that for individuals with low levels of DBTP, those with higher mindfulness experience significantly lower anxiety and depression compared to those with lower mindfulness. However, as DBTP increases, anxiety and depression levels in the high mindfulness group rise significantly, ultimately converging with those observed in the low mindfulness group. This indicates that while high mindfulness offers buffering effects against anxiety and depression, these effects diminish under increased DBTP.
Tulczyjew's Triplet With an Ehresmann Connection I: Trivialization and Reduction
(World Scientific Publ Co Pte Ltd, 2023) Esen, Ogul; Kudeyt, Mahmut; Sutlu, Serkan
We study the trivialization and the reduction of Tulczyjew's triplet, in the presence of a symmetry and an Ehresmann connection associated to it. We thus establish a geometric pathway for the Legendre transformations on singular dynamical systems.
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.
Merging Grid Technology with Oil Fields Power Distribution: A Smart Grid Approach
(Springer international Publishing Ag, 2024) Al-Eryani, Omar Khaled Fadhl Ali; Kayakutlu, Gulgun; Bektas, Zeynep; Kayalica, M. Ozgur
This study explores how grid technology can help improve oil fields' power distribution using a fuzzy multi-criteria decision-making approach. The study compares different grid technologies based on multiple criteria, such as technical feasibility, economic viability, environmental impact, social acceptance, and regulatory compliance. The fuzzy TOPSIS method is used because it can effectively handle both crisp and fuzzy data, as well as linguistic and numerical values. After obtaining a ranking of alternatives, the study also conducts a sensitivity analysis and a robustness check to validate the results. The results show that the hybrid grid is the most preferred option for oil fields' power distribution, followed by the smart grid, themicrogrid, the nano grid, and the conventional grid. This implies that integrating different grid technologies can provide more benefits and advantages than using a single grid technology. The study provides some implications and recommendations for oil fields to adopt or integrate different grid technologies to enhance their power systems and operations.
Citation - Scopus: 57
Introduction: Orienting Istanbul-Cultural Capital of Europe?
(Routledge Journals Taylor & Francis Ltd, 2010) Göktürk, Deniz; Soysal, Levent; Türeli, Ipek
[Abstract Not Available]
Citation - WoS: 27
Citation - Scopus: 26
New Biological and Chemical Evidences of Two Lamiaceae Species (thymbra Capitata and Thymus Sipyleus Subsp. Rosulans): in Vitro, in Silico and Ex Vivo Approaches
(Mdpi, 2022) Llorent-Martinez, Eulogio J.; Ruiz-Medina, Antonio; Zengin, Gokhan; Ak, Gunes; Jugreet, Sharmeen; Mahomoodally, Mohamad Fawzi; Emre, Gizem
In this study, the methanolic and infusion extracts of two species, Thymbra capitata and Thymus sipyleus subsp. rosulans, were tested for their chemical composition and biological abilities (antioxidant, enzyme inhibitory and anti-inflammatory effects). The extracts yielded total phenolic and flavonoid contents in the range of 83.43-127.52 mg GAE/g and 9.41-46.34 mg RE/g, respectively. HPLC analysis revealed rosmarinic acid to be a major component of the studied extracts (15.85-26.43%). The best ABTS radical scavenging ability was observed in the methanol extract of T. capitata with 379.11 mg TE/g, followed by in the methanol extract of T. sipylus (360.93 mg TE/g). In the CUPRAC assay, the highest reducing ability was also found in the methanol extract of T. capitata with 802.22 mg TE/g. The phosphomolybdenum ability ranged from 2.39 to 3.61 mmol TE/g. In terms of tyrosinase inhibitory effects, the tested methanol extracts (83.18-89.66 mg KAE/g) were higher than the tested water extracts (18.74-19.11 mg KAE/g). Regarding the BChE inhibitory effects, the methanol extracts were active on the enzyme while the water extracts showed no inhibitory effect on it. Overall, the methanolic extracts showed better enzyme inhibition compared to the infusion extracts. Molecular docking also showed the selected exhibited potential binding affinities with all enzymes, with a preference for cholinesterases. Additionally, the extracts were effective in attenuating the LPS-induced increase in COX-2 and IL-6 gene expression in isolated colon, thus indicating promising anti-inflammatory effects. The preliminary results of this study suggest that these species are good natural sources of antioxidants and also provide some scope as enzyme inhibitors, most likely due to their bioactive contents such as phenolic acids, and thus can be exploited for different applications related to health promotion and disease prevention.
A Methodological Approach to the Computational Problems in the Estimation of Adjusted PIN Model
(Routledge, 2025) Ersan, O.; Ghachem, M.
It is well documented that computational problems may lead to large biases in the estimation of probability of informed trading (PIN) models. The complexity of the AdjPIN model [Duarte, J. and Young, L., Why is PIN priced? J. Financ. Econ., 2009, 91, 119–138.], an extension of the conventional PIN model, exacerbates further these computational issues due to its larger parameter set. We introduce a dual approach to improve estimation reliability: a logarithmic factorization of the likelihood function and a strategic algorithm for generating initial parameter sets. The logarithmic factorization addresses floating point exceptions and numerical instability, while the algorithm significantly reduces the likelihood of converging to local maxima. We show that our methodology outperforms existing best practices and it enables accurate estimation of the AdjPIN model. We, therefore, strongly suggest its use in future studies. © 2025 Informa UK Limited, trading as Taylor & Francis Group.
Citation - WoS: 10
Citation - Scopus: 12
Determinants of Investment in Turkey: a Firm-Level Investigation
(Routledge Journals Taylor & Francis Ltd, 2019) Gezici, Armağan; Orhangazi, Özgür; Yalçın, Cihan
In this article we analyze the financing constraints-investment link for the case of Turkey between 1996 and 2013. As different from the existing studies on Turkey we use a more comprehensive data set that includes both publicly-traded and privately-owned firms and analyze the differences in constraints across small- and medium-sized firms and large firms. In addition to the commonly used cash-flow sensitivities we use alternative measures of constraints build from multiple firm specific variables. We find that small- and medium-sized manufacturing firms in Turkey are subject to financing constraints regardless of the measure used.
What Is Wrong With Sovereignty? A Critical Approach Through the Limitations of Legal Violence
(Istanbul University Press, 2025) Bingöl, D.
This article provides a critical perspective on current debates about sovereignty through the structural limitations of legal violence. A central discussion revolves around the question of whether the disaggregation of sovereignty as a result of international and global developments should be welcomed or resisted. While some argue that this provides better protection for human rights and international cooperation, others defend sovereignty as it ultimately means self-determination and democratic rule. However, being able to evaluate these arguments and developments requires an understanding of how sovereignty functions and what is problematic with it. To achieve this, the article grasps sovereignty from its two interrelated facets: Sovereignty signifies, on the one hand, that the legitimacy of law and political power comes from a popular source. On the other hand, it points to the supremacy of the authority that creates and enforces law through violence if necessary. Hence, the instrumentalization of violence is integral to its functioning. However, this method has structural drawbacks as the legal order built by violence requires its further instrumentalization, compelling the sovereign to compete with the people as the constituent source rather than just representing it. This endangers the promises of sovereignty, such as self-determination and democracy, and the article maps out these drawbacks by following Walter Benjamin’s analysis of legal violence. Hence, the real problem of sovereignty lies in its functioning rather than its territorial configurations. This awareness of the problem inherent in sovereignty provides critical guidance in evaluating the arguments and developments about the concept’s future. © 2025 Elsevier B.V., All rights reserved.
Citation - WoS: 13
Citation - Scopus: 9
Tectonic Development of Western Anatolian Extensional Province
(Taylor & Francis Inc, 2023) Yilmaz, Yucel; Gurer, Omer Feyzi
Western Anatolia is one of the fastest-extending continental regions. The approximately N-S extension, in three phases, generated grabens of various ages and trends. The first phase occurred during the late Oligocene-Early Miocene and caused the exhumation of the high-grade metamorphic rocks in the footwall of the low-angle detachment fault(s). This phase caused the NNE trending grabens, particularly in the northern areas. The second phase happened in the Late Miocene. The initial rise of the central horst (the Bozdag Horst) bounded by the detachment faults corresponds to this extension. The third phase generated the dominant morphotectonic entities of western Anatolia, the E-W trending normal faults, and the associated grabens in Quaternary. Western Anatolia began rotating counter-clockwise since the westerly escape of the Anatolian Plate reached the region and caused the generation of the NE-NW trending conjugated strike-slip faults and the consequent grabens along the coastal areas in the Holocene.
Citation - WoS: 1
Citation - Scopus: 1
Continuity and Change in Turkish Politics: Economic and Behavioural Explanations of Democratic Backsliding
(Routledge Journals, Taylor & Francis Ltd, 2024) Aydin, Mustafa; Yildirim, Kerem
This paper introduces a special issue focusing on the intricacies of Turkey's party system and the evolution of Turkish party competition amid democratic challenges. The introduction provides a brief overview of each paper in this special issue, which delves into the relationship between economic factors and voter behavior, offering insights into the continued dominance of the ruling party. While doing so, the special issue specifically examines the 2023 Turkish General elections, presenting alternative perspectives on how the incumbent party maintains its electoral success.
Citation - Scopus: 2
Healthcare 4.0 and Decision-Making Techniques in the Health Industry: a Systematic Literature Review
(Springer Nature, 2023) Küçükönder, H.; Görçün, Ö.F.
The current study examines the state-of-the-art literature on using MCDM frames to solve various evaluation problems faced in the health industry. As is known, the health industry has a highly complicated and dynamic structure. Moreover, the requirement to use advanced technology in almost all phases of the treatment process makes it challenging to handle these assessment problems faced in the healthcare industry. Also, these requirements make evaluation and selection processes more complicated for practitioners, as they produce many complicated uncertainties aside from existing ambiguities. Therefore, the health industry is one of the promising fields of application for scholars dealing with decision-making approaches and proposing a new methodology. The authors applied a systematic literature review approach to determine the gaps and key research themes and synthesize the findings. The study concludes with recommendations about the research framework to help the authors carry out future works on this issue. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
Citation - WoS: 1
Citation - Scopus: 1
Across Dimensions: Two- and Three-Dimensional Phase Transitions From the Iterative Renormalization-Group Theory of Chains
(2020) Keçoğlu, İbrahim; Berker, A. Nihat
Sharp two- and three-dimensional phase transitional magnetization curves are obtained by an iterative renormalization-group coupling of Ising chains, which are solved exactly. The chains by themselves do not have a phase transition or nonzero magnetization, but the method reflects crossover from temperaturelike to fieldlike renormalization-group flows as the mechanism for the higher-dimensional phase transitions. The magnetization of each chain acts, via the interaction constant, as a magnetic field on its neighboring chains, thus entering its renormalization-group calculation. The method is highly flexible for wide application.
Citation - WoS: 17
Citation - Scopus: 17
The Stage: a Space for Queer Subjectification in Contemporary Turkey
(Routledge Journals Taylor & Francis Ltd, 2012) Selen, Eser
This article focuses on the role of the stage in complex modes of gender performativity in the work of three Turkish performers: Zeki Muren (1931-1996) Bulent Ersoy (b. 1952) and Seyfi Dursunoglu (b. 1932) a.k.a. Huysuz Virjin [Cranky Virgin]. These three I suggest are the pioneers of contemporary Turkish queer performance. Their performances - both on-and off-stage - are validated through a reiterative absence of queerness in their everyday lives and stand in the midst of various negotiations between queers and the secular Islamic nation-state in Turkey. In the works of Muren Ersoy and Huysuz the stage is suggestive of a space where queerness can be managed. It is a contested space that does at least allow for the communication of queer ideas to a wider audience. I discuss the works of these three performers as three variations of queerness in Turkey in relation to different eras and different political climates that are directly related to the nation-state's desire to perform modernity. While explicating complicated modes of gender performativity I consider the stage as the primary space for a queer body to exist. Through this discussion I aim to activate debates both within and against the context of secular Islam on gendered political space and on those overlooked sexualized spaces in which the nation-state produces powerful yet unstable values to manage queer subjectivity in contemporary Turkey.
Citation - Scopus: 5
The Akp Story: Turkey's Bumpy Reform Path Towards the European Union
(2011) McDonald, Deniz Bingöl
The Justice and Development Party (AKP) government between 2002 and 2007 managed to accomplish unprecedented economic reforms maintaining 8% growth and passed legislation to change Turkey into a more democratic country in line with the Copenhagen political conditions. After being rewarded with the start of accession negotiations in 2005 and an electoral landslide in 2007 AKP's second term in office is in stark contrast with its earlier days of glory. AKP disengaged itself from the IMF agreement and took EU reforms off the top of its agenda bringing half a decade of political and economic reforms to a halt. The paper argues that AKP utilized the credibility of IMF and EU support to defeat its domestic rivals but once the external incentives lessened AKP turned inwards to consolidate its power and cared for little else. The first part of the paper explores how AKP managed to construct such a broad reform consensus and assesses the role of the external influence. The second part explores why and how this reform consensus fell apart.
Citation - WoS: 21
Citation - Scopus: 22
My Eyes Hurt: Effects of Jitter in 3D Gaze Tracking
(IEEE Computer Soc, 2022) Mughrabi, Moaaz Hudhud; Mutasim, Aunnoy K.; Stuerzlinger, Wolfgang; Batmaz, Anil Ufuk
Jitter, small fluctuations in the signal, is one of the major sources for a decrease in motor performance and a negative user experience in virtual reality (VR) systems. Current technologies still cannot eliminate jitter in VR systems, especially in the eye-gaze tracking systems embedded in many head-mounted displays. In this work, we used an HTC Vive Pro Eye, artificially added 0.5 degrees, 1 degrees, and 1.5 degrees jitter to the eye-tracking data, and analyzed user performance in an ISO 9241:411 pointing task with targets at 1 or 2 meters visual distance using angular Fitts' law. The results showed that the user's error rate significantly increases with increased jitter levels. No significant difference was observed for time and throughput. Additionally, we observed a significant decrease in performance in terms of time, error rate, and accuracy for the more distant targets. We hope that our results guide researchers, practitioners, and developers towards better gaze-tracking-based VR applications.
Citation - Scopus: 7
Gastrointestinal: Epiploic appendagitis
(Blackwell Publishing, 2005) Kantarci,M.; Duran,C.; Sirvanci,M.
[No abstract available]
Citation - WoS: 5
Citation - Scopus: 5
Temperature Dependence of Oxygen Diffusion Into Clay-Doped Ps Films
(John Wiley & Sons Inc, 2010) Uğur, Şaziye; Yargı, Önder; Pekcan, Önder
Fluorescence technique was employed for the measurement of the diffusion coefficient of oxygen into polystyrene (PS) latex/modified Na-activated bentonite (MNaLB) clay composite films. Three different MNaLB content (0 5 and 20 wt%) composite films were prepared from PS/MNaLB mixtures by annealing them at 200 degrees C above the glass transition temperature of PS for 10 min. To determine the diffusivity of oxygen in PS/MNaLB composite films diffusion measurements were performed over the temperature range from 25 to 70 degrees C. Pyrene (P) was used as the fluorescent agent. The diffusion coefficients (D) of oxygen were determined by combining the fluorescence quenching method with Fickian transport model and were found as a function of temperature for each MNaLB content film. The results showed that D values are strongly dependent on both temperature and clay content in composite film. It was also observed that D coefficients obey Arrhenius behavior from where diffusion activation energies were measured. POLYM. COMPOS. 31:77-82 2010. (C) 2009 Society of Plastics Engineers
Citation - WoS: 9
Citation - Scopus: 9
Smoke-Free Turkey: Evaluation of Outdoor Areas of Public Places
(Academic Press Inc Elsevier Science, 2019) Kaplan, Bekir; Grau-Perez, Maria; Çarkoğlu, Aslı; Ergör, Gül; Hayran, Mutlu; Navas-Acien, Ana; Cohen, Joanna E.
Significance: Secondhand tobacco smoke (SHS) exposure is a major cause of morbidity and mortality around the world. The objective of this study was to evaluate the presence of smoking in outdoor areas of public places in three largest Turkish cities (Istanbul Ankara and Izmir). Method: For this cross-sectional observational study the Turkish Statistical Institute randomly selected 10 sampling points in each city. Around each sampling point fieldworkers visited the closest bars/nightclubs cafes government buildings hospitals restaurants schools shopping malls traditional coffee houses universities children's playgrounds parks and open markets. We observed smoking ashtrays and cigarette butts at the outdoor areas of public venues within the urban districts of each city. The fieldwork was conducted in April–May 2016. Results: 477 venues were observed covering 1017 outdoor locations in which 17737 people were observed. Smoking in outdoor areas ranged from 3.7% around schools to 90% in open markets. Ashtrays were almost ubiquitous in hospitals (95.6%) shopping malls (92.0%) and universities (90.9%). Cigarette butts were more often observed in open markets (100%) shopping malls (96%) universities (95.5%) and parks (93.3%). Smoking at outdoor areas around schools was significantly lower than around other venues. Conclusion: Smoking in outdoor areas was common in most public places in Turkey except schools. The current indoor SHS legislation should be extended to cover adjacent outdoor areas of public venues in order to effectively protect people from SHS exposure in Turkey. © 2019 The Authors
Segregation of Hourly Electricity Consumption: Quantification of Demand Types Using Fourier Transform
(Econjournals, 2025) Yucekaya, A.; Bilge, A.H.; Yukseltan, E.; Aktunc, E.A.
Although aggregate electricity consumption provides valuable information for market analysis, it does not provide demand composition, including industrial, residential, illumination, and other uses. The information for subconsumptions is required for the reliable and cost-effective operation of the power system. As a first step towards the segregation of hourly total electricity consumption into its components, we use spectral analysis (Fast Fourier Transform) to determine relative strengths of the harmonics of annual, weekly and daily variations, to quantify the share of electricity consumption for heating, cooling, illumination and industrial activities. The method is applied to the data of France, Sweden, Finland, Norway, Turkiye, Italy, Spain, Greece, Germany, Great Britain, Poland and the Netherlands. Quantitative results obtained via spectral analysis are supplemented by qualitative features observed via time-domain analysis. The consumption ratios for each demand type are calculated using daily, weekly and annual harmonics and the results are presented. © 2025, Econjournals. All rights reserved.

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