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Uçar, Nuri

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https://hdl.handle.net/20.500.12416/8841
Name Variants
Ucar, N.
Ucar, Nuri
Job Title
Dr. Öğr. Üyesi
Email Address
nuriucar@cankaya.edu.tr
Main Affiliation
03.01. Bankacılık ve Finans
Bankacılık ve Finans
03. İktisadi ve İdari Birimler Fakültesi
01. Çankaya Üniversitesi
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Current Staff
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0000-0002-9687-652X
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DECENT WORK AND ECONOMIC GROWTH
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GOOD HEALTH AND WELL-BEING
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LIFE ON LAND
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PARTNERSHIPS FOR THE GOALS
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LIFE BELOW WATER
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QUALITY EDUCATION
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SUSTAINABLE CITIES AND COMMUNITIES
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CLEAN WATER AND SANITATION
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REDUCED INEQUALITIES
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INDUSTRY, INNOVATION AND INFRASTRUCTURE
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RESPONSIBLE CONSUMPTION AND PRODUCTION
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AFFORDABLE AND CLEAN ENERGY
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PEACE, JUSTICE AND STRONG INSTITUTIONS
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WoS Citation Count

171

Scopus Citation Count

187

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19. Uluslararası Ekonometri, Yöneylem Araştırması ve İstatistik Sempozyumu1
2.Uluslararası Ekonomi Araştırmaları ve Finansal Piyasalar Kongresi1
3rd International Conference on Computational and Experimental Science and Engineering (ICCESEN) -- OCT 19-24, 2016 -- Antalya, TURKEY1
Acta Physica Polonica A1
Econometrics Letters1
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Now showing 1 - 10 of 10
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    Conference Object
    Doğrusal Olmayan Bootstrap Koentegrasyon Testleri: OECD Ülkeleri için Satın Alma Gücü Paritesi Üzerine Bir Uygulama
    (2018) Uçar, Nuri; Güler, Hüseyin
    Bu çalışmanın doğrusal olmayan panel eşbütünleşme testleri önermesinin dışında ekonometri literatürüne ikinci katkısı ise, doğrudan eşbütünleşme testleri elde etmek yerine, uzun dönem denklemden elde edilen hata tahminlerinin hata düzeltme modellerine uzun dönem değişken olarak eklenip, doğrusal olmayan panel eşbütünleşme testlerini bu modeller üzerinden geliştirecek bootstrap yöntemi öne sürmesidir. Uygulamada, Bootstrap hipotez testleri, Monte Carlo yöntemiyle kritik değerler üretilip, bu kritik değerlere göre değerlendirilmiştir. Bootstrap tahminler için -hem parametre hem de istatistikler- Matlab da kod yazılmıştır. Üretilen eşbütünleşme testleri OECD ülkeleri için, Satın Alma Gücü Paritesi için uzun dönem ilişkinin olup olmadığını test etmek için kullanılmışlardır. Bu uygulamadan elde edilen sonuçlara göre, "diğer ülkelerde" uzun dönem ilişki varken, G7 ülkelerinde ise gözlemlenmemiştir. Satın Alma Gücü Paritesinin iki gurup arasında farklılaşması, ilginç bir sonuçtur. Veri seti oluştururken 2008 krizi dikkate alınarak oluşturulmuştur. Krizin 5 yıl öncesi ve sonrası veri setine dâhil edilmiştir. Buradaki amaç kriz şokunu ortak bir faktör olarak düşünmek ve bu faktörün yatay kesitte bağımlılığa neden olduğunu dikkate alarak bootstrap yaklaşımı ile parametre tahminlerini gerçekleştirmektir. Ayrıca, kriz öncesi dönemi kapsayan veriler içinde Satın Alma Gücü Paritesi araştırılmıştır. Tüm ülkeleri dikkate aldığımızda, kriz dönemini içeren 2003.01-2013.01 dönemi ile kriz öncesi dönem farklılaşmaktadır. Kriz öncesi doğrusal olmayan eşbütünleşme gözükürken, kriz döneminde böyle bir şey söz konusu değildir. Krizin neden olduğu ekonomik şokun ülke ekonomilerinde enflasyon ve döviz kuru verilerinde birlikte kırılmalara (co-breaking) neden olması bu değişkenler arasında doğrusal olmayan eşbütünleşmenin varlığı yönünde beklentiye neden olabilir. Bu doğrusal olmayan yapının "diğer ülkelerde" varlığını göstermesi fakat "G7" ülkelerinde ise eşbütünleşmenin gözlemlenmemesi, bu ülkelerin bu süreçte birbirlerinden ayrıştıklarını da göstermektedir Ekonometri teorisi açısından, bu çalışmada ortaya atılan testlerin istatiksel ve asimptotik özellikleri geliştirilmeye açıktır. Ayrıca, burada önerilen doğrusal olmayan testler uygulama açısından sadece bootstrap yaklaşımı ile değil, diğer yatay kesit bağımlılığını dikkate alan panel veri analizi içerisinde de geliştirilmeye uygundur. Uygulama aşamasında ise, döviz kurundaki değişen varyans problemini dikkate alan test istatistikleri ışığında Satın alma Gücü Paritesi geliştirilebilir.
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    Article
    Citation - WoS: 5
    Citation - Scopus: 7
    Testing Stochastic Income Convergence in Seasonal Heterogeneous Panels
    (Elsevier, 2010) Guler, Huseyin; Ucar, Nuri
    In this paper we introduce a seasonal version of the Solow-Swan growth model and acquire an empirical income convergence equation. We take this equation as a basis to investigate whether income convergence exists in an OECD sample. To do this, we propose the test statistics under various asymptotic properties for some of the seasonal frequencies in the context of nonstationary heterogeneous panels. Critical values and moments of our statistics are generated and their finite sample performances are examined via Monte Carlo simulations. (C) 2009 Elsevier B.V. All rights reserved.
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    Article
    Citation - WoS: 1
    Effect of Nickel Content on the Boronising Behaviour of Permalloys
    (Scibulcom Ltd, 2015) Ucar, N.; Karakaş, Mustafa Serdar; Iyi, O.; Uçar, Nuri; Calik, A.; Karakas, M. S.; Malzeme Bilimi ve Mühendisliği; Bankacılık ve Finans
    Permalloys with nickel contents ranging from 60 to 90% were boronised in a solid medium using the powder pack method. In this method, commercial Ekabor-II powders were thoroughly mixed with ferro-silicon powders to form the boronising medium. The samples were boronised in an electrical resistance furnace for 5 h at 1173 K under atmospheric pressure. The results showed that borosilicide and boride layers were formed on the surface of boronised permalloys, with average hardness of 900-1000 HV0.1. The average thickness of the multilayer coating was 90 mu m, and did not show significant change with Ni content within the range studied. The saw-tooth morphology of the boride layers were smoothened with increasing nickel content.
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    Article
    Citation - WoS: 5
    Citation - Scopus: 5
    Investigation of the Erosive Wear Resistance of Boronized Ash-Blowing Nozzles
    (Polish Acad Sciences inst Physics, 2017) Calik, A.; Ozbakir, O.; Karakas, S.; Ucar, N.
    In this study, pack boronizing was applied to ash-blowing nozzles manufactured from AISI 1040 steels using Ekabor II powders as the boronizing source at a temperature of 1273 K for a duration of 8 h. Erosive wear tests of boride ash-blowing nozzles were carried out in ash delivery line of thermal reactor under actual working conditions. It was observed that erosive wear resistance of borided ash-blowing nozzles were increased 3 times as a result of the boronizing process. The improved wear resistance of the borided samples can be explained by increased surface hardness and higher work hardening.
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    Article
    Citation - WoS: 150
    Citation - Scopus: 163
    Testing for Unit Root in Nonlinear Heterogeneous Panels
    (Elsevier Science Sa, 2009) Ucar, Nuri; Omay, Tolga
    We develop unit root tests for nonlinear heterogeneous panels where the alternative hypothesis is an exponential smooth transition (ESTAR) model, and provide their small sample properties. We apply our tests for investigating the income convergence hypothesis in the OECD sample. (C) 2009 Published by Elsevier B.V.
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    Conference Object
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    Article
    Citation - WoS: 9
    Citation - Scopus: 11
    Boriding Kinetics and Mechanical Properties of Borided Commercial-Purity Nickel
    (Natl inst Science Communication-niscair, 2017) Uçar, Nuri; Calik, A.; Ucar, N.; Delikanli, K.; Carkci, M.; Karakas, S.; Bankacılık ve Finans
    Kinetics of boride layer growth and tensile behaviour in bonded commercial-purity nickel was investigated. Bonding was carried out in a solid medium consisting of Ekabor-II powders at 1173, 1223 and 1273 K for periods of 3, 5 and 8 h. Scanning electron microscopy (SEM) and optical microscopy showed column morphology in the boride layer. X-ray diffraction (XRD) analyses indicated that the boride layer formed on the surface consisted mainly of Ni2B, with precipitates of Ni6Si2B. A parabolic relationship between layer thickness and processing temperature was observed. The obtained results showed that although the boride layer thickness increased with increasing boriding temperature and time, boriding parameters had no significant effect on the hardness of the boride layer or the matrix. Tensile properties were negatively influenced by the bonding treatment; both yield and tensile strength values decreased due to the presence of the hard yet brittle surface coating. In addition, the growth kinetics of boride layers was also analysed. The results showed a nearly parabolic relationship between the layer thickness and the process temperature, with activation energy of 47.3 kJ mol(-1).
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    Article
    Citation - WoS: 1
    Citation - Scopus: 1
    Testing for Unit Roots in Nonlinear Dynamic Heterogeneous Panels With Logistic Smooth Breaks
    (Mdpi, 2023) Omay, Tolga; Ucar, Nuri
    In this study, we investigate the validity of the purchasing power parity (PPP) proposition for 34 European and selected global countries. For this purpose, we propose a new unit root test for cross-sectionally dependent heterogeneous panels that allows for gradual structural breaks and symmetric nonlinear adjustment toward the equilibrium level. The alternative hypothesis stationary is obtained by symmetric adjustment due to exponential smooth transition autoregression (ESTAR) around a nonlinear trend. Moreover, we provide small sample properties extensively for the newly proposed test. Hence, this alternative hypothesis has been proven to characterize real exchange rate data (REER) correctly. Thus, the newly proposed tests provide an essential basis for modeling the REER series correctly. Finally, we also derive the approximate asymptotic distribution of the proposed tests using new techniques.
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    Article
    Rethinking Fisher Effect with New Keynesian Phillips Curve
    (2019) Uçar, Nuri
    I modify and enlarge the simple Fisher equation by including different inflation dynamics and multiple common unobservable factors. I investigate the long runrelationship by carrying out a series of estimators and models that have been developed recently. I observe that augmentation of Fisher equation leads to provide the supportive evidence for the long run relationship between nominal interest rate and inflation.
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    Conference Object
    Diffusion Kinetics of Binary Ti-Ni Shape Memory Alloys
    (Polish Acad Sciences inst Physics, 2017) Dogan, S.; Ozdemir, A. F.; Karakas, S.; Calik, A.; Ucar, N.
    In this work, the boriding of binary Ti-Ni shape memory alloys was carried out in a solid medium at 1173 and 1273 K for 2, 4, and 8 h using the powder pack method with Ekabor-Ni powders. The boride layer was characterized by optical microscopy and scanning electron microscopy. The obtained results show that boride layer thickness increases with the increasing boriding temperature and time. Depending on temperature and boride layer thickness, the diffusion process is thermally activated, with the mean value of the activation energy being close to 67 kJ/mol.