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Koleksiyondaki öğeler
- MakaleYalnız künye2018Scopus SJRQ2Testing twin deficits hypothesis for Eu-27 and Turkey: A panel granger causality approach under cross-sectional dependence
Bölükbaş, Mehmet; Topal, Mehmet Hanefi; Hotunluoğlu, Hakan
Twin deficits hypothesis has been one of the most widely-applied phenomenon in the economics literature. In this study, the twin deficits hypothesis was tested for the EU-27 member states and Turkey with the data covering the 2002:Q1-2014:Q1 period. Unlike other studies, the twin deficits hypothesis was tested by using second generation panel causality tests that considered the cross-sectional dependence. According to the findings of this study, which used panel Granger causality tests suggested by Dumitrescu-Hurlin (2012) and Emirmahmutoğlu-Kose (2011), there is statistically significant bidirectional causality between budget deficit (BD) and current account deficit (CAD) in the relevant period. It was found out a bidirectional causality between BD and CAD in sixteen of the twenty-eight countries (Austria, Belgium, Bulgaria, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Italy, Netherlands, Romania, Spain, Turkey and the UK) and a unidirectional causality from BD to CAD was also noticed in five EU countries (Cyprus, Latvia, Lithuania, Poland and Slovakia). Nevertheless, the findings indicated that there is a unidirectional causality from CAD to BD in Hungary, Luxembourg and Malta but there is no causality between BD and CAD in Ireland, Portugal, Slovenia, and Sweden.
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İncele - MakaleYalnız künye2017Scopus SJRQ1Nothing is more important than my partner's health: Turkish men's perspectives on partner's appearance after mastectomy and alopecia
Gürsoy, Ayla; Koçan, Sema; Aktuğ, Cemile
Purposes The aim of this study was to acquire a deeper understanding of male experiences on the emotional and social impact of their partners’ mastectomy and chemotherapy-induced alopecia. Methods A purposive sample of 16 males whose partners had undergone mastectomy and alopecia due to chemotherapy was chosen. The data were collected through a semi-structured interview method. Interpretative Phenomenological Analysis of tape-recorded interviews was employed. Results Two main themes emerged from the data: facing the changes and my wife and I at present. Male partners were affected differently by the change in the physical appearance of their female partners. Our study participants said it was a difficult experience to see their partners for the first time after the surgery, but they emphasized that it was more important that their partners were healthy than the fact that they did not have a breast and hair. They also said they did not know how to behave towards their partners after surgery and/or chemotherapy. Nevertheless, they felt that the disease process of their partners had strengthened their bond and had not negatively influenced their relationship with others. Conclusions The changes in the partners’ physical appearance after mastectomy and chemotherapy affected males differently in psychological, emotional and social terms. Since nurses working in this field are in contact with patients during all phases of treatment and care, it would be positive and beneficial to plan nursing interventions that give emotional support for male partners of patients with breast cancer.
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İncele - MakaleAçık Erişim2018Student views on using smart boards in turkish education
Kırbaş, Abdulkadir
One of the greatest opportunities for technological developments in the field of education is computer aided smart boards. Our country has adapted to these technological developments and initiated the smart board applications with FATIH Project which is one of the few projects of its size of the world. The aim of this research is to reveal the contribution of smart boards – which are the most important elements of the FATIH project-to Turkish education, their effects on student motivation, and also their negative aspects by taking the views and opinions of students who are directly involved in the project. The sample of the research consists of 600 students studying in Yakutiye, Palandöken and Aziziye districts of Erzurum province in the Fall semester of 2017-2018 academic year. Based on the results of the research, it was found that thanks to using smart boards in Turkish education lessons, the students understood Turkish better, learned the course subjects easily, were more successful in Turkish, the visual and audio materials used in smart board applications were beneficial in better understanding the topic, students had the opportunity to learn the topics from more and various sources, smart boards made the lessons fun and enjoyable, increased interest for the lessons, students liked using the smart boards, smart boards had positive effects on learning and student motivation; whereas some negative opinions were also found that some students had difficulties using smart boards, frequent malfunctions in the smart boards caused a loss of time in lessons, students were not willing to prepare homework that included the use of smart boards, visual quality of the boards was low, and smart boards made the students more lazy.
AtıfScopus9OpenAlex10İncele - MakaleYalnız künye2016Scopus SJRQ2Multiplicative Laplace transform and its applications
Yalcin, Numan; Celik, Ercan; Gokdogan, Ahmet
In this work, taking definitions and properties of Laplace transform in classical analysis as a basis, we give some basic definitions and properties of the multiplicative Laplace transform. In addition, solutions of some multiplicative differential equations are obtained by the help of this transform.
AtıfScopus23WoS23OpenAlex32İncele - MakaleYalnız künye2017Scopus SJRQ3Approximate solution for an inverse problem of multidimensional elliptic equation with multipoint nonlocal and neumann boundary conditions
Ashyralyyev, Charyyar; Akyuz, Gulzipa; Dedeturk, Mutlu
In this work, we consider an inverse elliptic problem with Bitsadze-Samarskii type multipoint nonlocal and Neumann boundary conditions. We construct the first and second order of accuracy difference schemes (ADSs) for problem considered. We stablish stability and coercive stability estimates for solutions of these difference schemes. Also, we give numerical results for overdetermined elliptic problem with multipoint Bitsadze-Samarskii type nonlocal and Neumann boundary conditions in two and three dimensional test examples. Numerical results are carried out by MATLAB program and brief explanation on the realization of algorithm is given.
AtıfScopus22WoS19İncele - BildiriAçık Erişim2018Daily and monthly module temperature variation for 9 different modules
Özden, Talat; Tolgay, Doga; Akinoglu, Bulent G.
One of the main parameter affecting the efficiency of PV modules is the module temperature. In this respect, outdoor testing of modules is very important to determine the temperature dependent performances and degradation rates. In this work, we analyzed the module temperatures of 9 different modules tested in the outdoor testing facility of METU-GUNAM, Ankara (latitude ∼40°N, in Central Anatolia and the climate is dry continental). The tested module types are two CIS (identical), one μc-Si/a-Si, one Poly-Si, three Mono-Si (two identical), one HIT and one bifacial. The module temperatures can reach up to 76°C while the ambient is around 39 °C during summer days. Monthly average module temperatures can reach up to 33.7°C (CIS) while the monthly average ambient is at 26.0°C and drops down to 1 °C while average ambient temperature is about the same as average module temperature. The results showed that the monthly averages of module temperatures differences are maximum during summer (∼3.5°C) and minimum during winter (1.1°C). It is interesting that the two CIS modules have the highest monthly average module temperature and although they are supposed to be identical their temperatures differ significantly. Bifacial and HIT module temperatures are lower than the Mono-Si modules. One of the two identical Mono-Si modules was not cleaned and its module temperature is always lower than the one that was cleaned periodically, as expected. In this work, we also present the results and discussions on the spatial variations of measured module temperatures of PV panels.
AtıfScopus6OpenAlex6İncele - BildiriYalnız künye2017Black sea basin satellite gravity data and major tectonic features: Tectonic implications
Maden, N.
The Black Sea is a marginal sea represented by the Caucasus to the east, by the Balkanides-Pontides to the south and southwest, the Crimean Mountains to the north, and young platforms (Moesian and Scythian) to the west and northwest.The Black Sea basin is divided into two parts, Western and Eastern, separated by the Mid Black Sea ridge.The origin of the eastern Black Sea basin and Pontides orogenic belt is still controversial due to lack of systematical geological, geophysical and geochemical data. It is widely accepted that the eastern Pontides orogenic belt was shaped by northward subduction of Neotethys or Paleotethys oceanic lithosphere during the late Mesozoic and the Black Sea basin opened as a back-arc basin behind the eastern Pontides magmatic arc. In this study, the tectonic elements of the Black Sea basin are investigated by using satellite gravity data.The time of formation of Black Sea basin occurred from Paleozoic to Mesozoic, showing the Black Sea is a remnant of the Paleotethys Ocean.The numerical studies give the indication of southward subduction model for the origin of the Pontides during late Mesozoic-Cenozoic and compressional tectonic regime is still active in the Eastern Black Sea region.
- MakaleAçık Erişim2017Scopus SJRQ3Production of structured lipid with a low omega-6/omega-3 fatty acids ratio by enzymatic interesterification
Ilyasoglu, H.
A structured lipid (SL) constituting omega fatty acids was synthesized by using linseed and grape seed oils as substrates via a lipase-catalyzed reaction. Lipozyme® TL IM was used as a biocatalyst. Good quadratic models predicting the incorporation of omega fatty acids were achieved via the Response surface methodology (RSM). The optimal conditions for targeted omega-6/omega-3 fatty acid ratio (2:1) were obtained at a substrate molar ratio 1.4, time 8.4 h, and enzyme amount 6.4%. The SL contained linoleic acid (43 g 100g-1), which was mainly located in the sn-2 position (40 g 100g-1). α-Linoleic acid, and α-linolenic acid at the sn-2 position were 22 g 100g-1, and 11 g 100g-1, respectively. The oxidative stability of the SL, and SL with antioxidants was also investigated. The produced SL may be proposed as a source of a balanced intake of omega fatty acids and an ingredient in functional food formulations.
AtıfScopus5WoS4OpenAlex6İncele - MakaleYalnız künye2019Scopus SJRQ4On some properties of hyper-bessel and related functions
Aktaş, I.
In this study, by using the Hadamard product representation of the hyper- Bessel function and basic concepts in mathematics we investigate the sign of the hyper- Bessel function x → J αd (x) on some sets. Also, we show that the function x → J αd (x) is a decreasing function on [0, J αd ,1), and the function is an increasing function on (0,∞), where j αd ,1 and II αd denote the first positive zero of the function J αd (x) and modified hyper-Bessel function, respectively. In addition, we prove the strictly log-concavity of the functions J αd (x) and J αd (x) on some sets. Moreover, we give some illustrative examples regarding our main results.
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İncele - MakaleYalnız künye2018Scopus SJRQ4Investigation of the inhibitory effects of human carbonic anhydrase i and jack bean urease by coumarin derivates
Aygul, Imdat; Karahalil, Fatma Yaylaci; Danis, Ozkan; Ogan, Ayse; Kolayli, Sevgi
Introduction: This study investigated the in vitro inhibition properties of newly synthesized coumarin derivates (C1-C5) against human carbonic anhdyrase I (hCA-I) and jack bean urease. Activities were expressed as IC50 (mg/mL), the concentration reducing 50% of the enzymes. The IC50 values for hCA-I ranged 5.20 µM from 12.10 µM, with compound C3 exhibiting the highest activity. The inhibition values for urease ranged 22.30 µM to 39.00 µM, the highest activity being observed in C5. Conclusion: Comparing the inhibitions with standard inhibitors of the enzymes, while the samples exhibited moderate inhibitions against hCA I, high inhibition was determined against urease.
AtıfScopus2OpenAlex1İncele - BildiriYalnız künye2018Optimal scheduling of time shiftable loads in a task scheduling based demand response program by symbiotic organisms search algorithm
Cakmak, R.; Altas, I.H.
Demand side management is one of the key issues in smart electrical grid studies. Power demand of consumers can be managed via demand response(DR) programs. Task scheduling (TS) based demand response is one of the DR schemes. Objective of the TS approach is to schedule activation time of the appropriate time-shiftable loads to reduce power consumption in peak-demand hours. Heuristic optimization methods can be used to provide this objective. Symbiotic Organisms Search (SOS) and Cuckoo Search (CS) algorithms are two of the most recent heuristic methods. In this paper, scheduling of the time-shiftable home appliances executed by SOS and CS algorithms. Time-shiftable home appliances of the consumers and run time tolerances of them aggregated by mini public survey to achieve results which close to reality. Obtained results are indicated the superiority of the SOS algorithm and demonstrated the positive effects of the demand side management on the electrical grid.
AtıfScopus20WoS12OpenAlex18İncele - BildiriYalnız künye2017Detecting and removing repetitive errors from PPP time series by means of adaptive filter
Yalvaci, Sefa; Ustun, Aydin; Berber, Mike Mustafa
PPP (Precise Point Positioning) is a relatively new GNSS (Global Navigation Satellite System) method that enables position determinations using a single receiver. Being able to survey with a single receiver makes this approach more attractive and affordable than other GNSS positioning techniques. Since a single receiver is used, a drawback of this technique is propagation of errors such as orbit and clock uncertainties, atmospheric disturbances etc. Due to these errors, precision of point positioning may reach up to decimeter levels. Fortunately, some of these error sources such as orbital errors, multipath etc. are repetitive errors and therefore can be detected by using digital filters. Adaptive noise canceling filters are used to detect the correlated part of the time series. These filters optimize themselves using the Least Mean Square (LMS) algorithm which is a powerful tool for Geosciences and are also used for many engineering applications. In this study, it is aimed to detect repetitive errors on coordinate time series by using adaptive noise canceling filter. For the application, four stations have been selected from NGS CORS (National Geodetic Survey Continuously Operating Reference Station) network. Two of these stations are highly affected by multipath error and the other two are not. The coordinate time series of the GNSS sites have been obtained using PPP technique on kinematic mode (epoch by epoch) for several consecutive days. The cross-correlation analysis has been performed and up to 92% correlation has been detected between the daily time series. The correlated part of the data set has been captured by means of adaptive noise canceling filter and removed from the data set. After the filtration process, up to 50% precision improvement has been achieved on coordinate time series, especially for the stations affected by multipath.
AtıfScopus1İncele - MakaleYalnız künye2016Scopus SJRQ3Effect of chemical Ni – B coating on the structure and tribological properties of plasma nitrided pure titanium
Çelik, Ýlhan; Karakan, Mehmet
The structure and the wear resistance of commercial-purity titanium subjected to plasma nitriding followed by chemical deposition of a Ni – B coating are studied.
AtıfScopus4WoS4OpenAlex4İncele - MakaleAçık Erişim2017Scopus SJRQ4Association of IGF and IGFBP2 gene polymorphisms with growth and egg traits in Atak-S laying hens
Das, Huseyin; Tarim, B.; Demir, S.; Küçükkent, N.; Cengiz, S.; Tülek, E.; Aksakal, V.
Atak-S laying hens are a high-performance hybrid obtained by crossing of the Rhode Island Red (RIR) X the Barred Plymouth Rock (BR) and are being produced in the Ankara Poultry Research Institute since 1997. Phenotypic and genetic improving studies are continuous for this hybrid. In this study three different SNPs, two from IGF1 and one from IGFBP2 genes, were examined in 150 Atak-S chickens. Genetic association of SNPs were compared to body weight and egg number till 32 weeks of age, body weight at sexual maturity, age at sexual maturity and also egg quality traits such as egg shell breaking strength, shell thickness, Haugh unit, albumen index, yolk index and shape index were statistically analyzed. Only IGF1(a) locus was in agreement with Hardy-Weinberg equilibrium, while, the rest of the loci were not. As a result of the comparisons performed to the three SNPs, it was determined that there was a significant association (P < 0.05) between the T364C haplotypes of the IGF1(b) locus and body weight at 32 weeks of age, but there was not any association to the other traits.
AtıfScopus3WoS2OpenAlex4İncele - MakaleAçık Erişim2017Scopus SJRQ3Numerical solution to Bitsadze-Samarskii type elliptic overdetermined multipoint NBVP
Ashyralyyev, Charyyar
This paper is devoted to a Bitsadze-Samarskii type overdetermined multipoint nonlocal boundary value problem (NBVP). This inverse problem is reduced to an auxiliary multipoint NBVP. Stability estimates for the solution of the auxiliary NBVP are established. The finite difference method is applied to get the first and second order of accuracy of approximate solutions of the abstract overdetermined problem. Stability estimates for the solution of difference problems are proved. Then the established abstract results are applied to get stability estimates for the solution of the Bitsadze-Samarskii type overdetermined elliptic multidimensional differential and difference problems with multipoint nonlocal boundary conditions (NBVC). Finally, numerical results with explanation on the realization for two dimensional and three dimensional elliptic overdetermined multipoint NBVPs in test examples are presented.
AtıfScopus30WoS23OpenAlex27İncele - MakaleYalnız künye2006Scopus SJRQ2Sedimentary records of the extensional tectonic regime with temporal cessation: Gümüşhane Mesozoic Basin (NE Turkey)
Yilmaz, Cemil; Kandemir, Raif
The Gümüşhane Mesozoic Basin is characterized by Lower-Middle Jurassic volcanic-siliciclastic sediments (Şenköy Formation), Upper Jurassic-Cenomanian platform carbonates (Berdiga Formation) and Upper Cretaceous turbidites (Kermutdere Formation). Four extensional periods (Lias-Dogger, Turonian-Coniacian, Late Campanian (?) and Early (?) Maastrichtian) separated by two quiet tectonic periods (early Malm-Cenomanian and Santonian-Campanian) have been defined in this sequence. The previous studies suggested that Mesozoic basins only formed by extensional movements in the middle Cretaceous. Three extensional periods seperated by two quiet periods from the Cenomanian to the end of the Maastrichtian in Gümüşhane and NE Turkey were firstly proved by sedimentological findings in this study. The definition of these periods depends on features such as (1) neptunian dykes in different levels, (2) shallow marine limestone, (3) thinning-and-fining-upward sequences, (4) mixed faunal assemblages, (5) micro-turbiditic structures, (6) syn-sedimentary fault, (7) grabens, half-grabens, (8) pelagic limestone, (9) calciturbidites, (10) laterally and vertically rapid changes of the thickness and facies, (11) platform-to-basin transition and (12) monogenic breccias.
AtıfScopus48İncele - MakaleYalnız künye2008Scopus SJRQ1Elemental and Sr-Nd-Pb isotopic geochemistry of the most recent Quaternary volcanism in the Erzincan Basin, Eastern Turkey: framework for the evaluation of basalt-lower crust interaction
Karsli, Orhan; Chen, Bin; Uysal, Ibrahim; Aydin, Faruk; Wijbrans, Jan R.; Kandemir, Raif
Whole-rock geochemical and Sr, Nd and Pb isotope data are presented for a representative suite of the Quaternary Erzincan Volcanics (QEV) from the Erzincan basin (EB) along the North Anatolian Fault Zone, aiming to understand their origin and implications for basalt-lower crust interaction. Unspiked K-Ar and 40Ar/39Ar dating of dome lavas from the QEVs yielded ages of 102 ± 2 to 1061 ± 88 ka. The QEVs range from high-K low silica trachy-andesite to rhyolite in composition, with rhyolite volumetrically the most abundant. All rocks show high-K calc-alkaline affinity, a geochemical signature common to many post-collisional magmas. They are characterized by enrichment in LILE (Rb, Ba, K, Th) and LREE ((La/Yb)CN = 3-33), with pronounced depletion of HFSE. All lavas show negligible or small negative Eu anomalies in the andesitic to dacitic and strong Eu anomalies in the rhyolitic samples. These rocks have relatively low 87Sr/86Sr = 0.70404-0.70587 and slightly depleted Nd isotopic compositions (εNd from - 0.9 to 2.8), with significantly varied Mg# ranging from 2 to 53. Pb isotopic compositions [206Pb/204Pb = 18.90-19.02, 207Pb/204Pb = 15.64-15.70, 208Pb/204Pb = 38.91-39.97] reveal an enriched source signature, which implies that some portions of metasomatized lithospheric mantle could have contributed to their genesis. The isotopic ratios and chemical features along with the textural and compositional disequilibrium of the plagioclases and amphiboles suggest that mixing of mafic and felsic magmas played an important role in the magma genesis. A possible scenario for the genesis of these volcanic rocks is that basaltic magma formed as a result of partial melting of a subcontinental lithospheric mantle source responding to a possible upwelling of asthenospheric mantle which was caused by the extension produced by strike-slip tectonics. Underplating of these high-temperature basaltic magmas sparked partial fusion of a juvenile lower continental crust producing felsic melts; then magma mixing between basaltic and the felsic magmas followed. Fractional crystallization, with minor amounts crustal contamination could have played an important role in the evolution of magma. Modelling based on Sr and Nd isotope data shows that less than 10% of a basic magma and about 90% of juvenile lower continental crustal material was involved in the generation of the QEVs in a pull-apart basin along the North Anatolian Fault Zone.
AtıfScopus40OpenAlex38İncele - DüzeltmeYalnız künye2017Scopus SJRQ1Retraction notice to “Regional sustainable water and energy development projects: A case of Southeastern Anatolia Project (GAP) in Turkey” [Renew Sustain Energy Rev 16/2 (2011) 1146–1156](S136403211100551X)(10.1016/j.rser.2011.11.015)
Akpinar, A.; Kaygusuz, K.
This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/about/our-business/policies/article-withdrawal). This article has been retracted at the request of the Editor-in-Chief. The authors have plagiarized part of a paper that had already appeared in Renewable Energy, Volume 39 (2012), Pages 17–23, DOI: 10.1016/j.renene.2011.08.006. Although the authors were contacted for a reaction, we were unsuccessful in obtaining a response. One of the conditions of submission of a paper for publication is that authors declare explicitly that the paper is not under consideration for publication elsewhere. Re-use of any data should be appropriately cited. As such this article represents a severe abuse of the scientific publishing system. The scientific community takes a very strong view on this matter and apologies are offered to readers of the journal that this was not detected during the submission process.
- BildiriYalnız künye2018On the Yearly Performance of a Bifacial PV Module in Central Anatolia - Turkey
Özden, Talat; Turan, Raşit; Aklnoǧlu, Bülent Gültekin
With the tremendous increase in the photovoltaic (PV) power plants world-wide remarkable decreases in their installation prices per watt are attained mainly due to economic scale effect. This brings questioning to increase their energy yields by considering any possible way like fabricating bifacial solar modules. Present study is on the performance analysis of a bifacial PV module using one-year outdoor testing results in Ankara-Turkey. The module performed very well and reached a specific yield value of 1750 kWh/kWp. This value for Central Anatolia region is well above the values predicted (and suggested) by the local authorities. The efficiency and performance ratio variation with respect to ambient and module temperature are obtained. The calculated dependence of efficiency on the module temperature is found to be η=-0.073Tmod+18.05, and the maximum measured module temperature is about 70 °C. The results show that the bifacial modules have the potential to replace the mono facial modules that are now dominating the PV market.
AtıfScopus3OpenAlex2İncele - MakaleAçık Erişim2017Scopus SJRQ3Morus rubra extract induces G1 cell cycle arrest and apoptosis in human lung and prostate cancer cells
Turan, Ibrahim; Demir, Selim; Kilinc, Kagan; Aliyazicioglu, Yuksel; Alver, Ahmet; Misir, Sema; Yaman, Serap Ozer; Akbulut, Kubra; Mentese, Ahmet; Deger, Orhan
Objective: Cancer is one of the most deadly types of disease and evasion from apoptosis and unstoppable cell proliferation are accepted as its distinctive features. Many studies have evaluated the cytotoxic effect of different Morus species but, there is no study about cytotoxic effect of Morus rubra. In this study we aimed to evaluate phenolic composition, antioxidant properties and cytotoxic effect of acidified dimethyl sulfoxide extract of M. rubra (AMRE). Method: Antioxidant properties, phenolic composition and cytotoxic effect of AMRE were determined using spectrophotometric methods, HPLC, and MTT assay, respectively. Then, mechanisms of cytotoxic effect of AMRE on human prostate (PC-3) and lung (A549) cancer cells were examined in regard to cell cycle, apoptosis and mitochondrial membrane potential using flow cytometric methods. Results: Total phenolic content and reducing power values were 11.9 mg gallic acid equivalents and 42.9 mg trolox equivalents per g sample, respectively. Ascorbic and gallic acid were detected in AMRE as major antioxidant compounds. We determined that AMRE increased cell cycle arrest at G1 phase and exhibited apoptotic features via decreasing mitochondrial membrane potential in both prostate and lung cancer cells. Conclusion: These findings demonstrate that M. rubra extract can affect the behavior of human prostate and lung cancer cells in vitro conditions, and this effect now needs to be investigated in vivo.
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