Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Uzun, Sevda(77)
- Merdan, Mehmet(73)
- Duran, Celal(54)
- Ozdes, Duygu(50)
- Baltaci, Cemalettin(45)
- Kaygusuz, Abdullah(45)
- Kulakaç, Nurşen(39)
- Ashyralyyev, Charyyar(38)
- Karsli, Orhan(37)
- Demir, Selim(36)
- Öztürk, Serkan(36)
- Dokuz, Abdurrahman(35)
- Turan, Ibrahim(35)
- Araz, Onur(33)
- Kandemir, Raif(31)
- Sipahi, Ferkan(30)
- Topal, Fevzi(30)
- Kurt, Kemal(28)
- Peker, Iskender(28)
- Arslan, Mehmet(27)
- Baltacı, Cemalettin(27)
- Maden, Nafiz(27)
- Ozturk, Samet(27)
- Aydin, Aydanur(26)
- Vural, Alaaddin(26)
- Bayrakdaroglu, Serdar(25)
- Kurnaz, Muammer(25)
- Reis, Hatice Catal(25)
- Akar, Zeynep(24)
- Aydin, Faruk(24)
- Gücer, Mehmet Ali(24)
- Topal, Meryem(24)
- Yolcu, Halil(24)
- Yücel, Cem(24)
- Anaç, Halil(23)
- Kankal, Murat(23)
- Ürkek, Bayram(23)
- Aliyazicioglu, Yuksel(22)
- Günen, Mehmet Akif(22)
- Tuncer, Metin(22)
Yayınlar
- MakaleAçık Erişim2022Scopus SJRQ2Investigation of Yield and Quality Parameters of Some Local and Newly Registered Bread (hexaploid) Wheat (Triticum aestivum L.) Genotypes Under Rainfed Agricultural Conditions; [Untersuchung von Ertrags- und Qualitätsparametern einiger lokaler und neu registrierter (hexaploider) Brotweizen-Genotypen (Triticum aestivum L.) unter Regenfeldbaubedingungen]
Sirat, Abdulveli
Hexaploid bread wheat is an economically important crop grown worldwide. There is need to new breed cultivars to meet the needs of ever-growing populations. This study was carried out to determine the yield and quality traits of some newly bread wheat cultivars and locally popular wheat cultivars. The research was carried out at Siran-Gumushane (Turkey) during 2015–2016 and 2016–2017. A total of 24 bread wheat genotypes (14 commercial cultivars and 10 local genotypes) were used as plant materials in the study. The experiment was carried out in randomized complete block design with three replications. Duration of heading, plant height, spike length, number of seeds per spike, seed weight per spike, seed yield, thousand seed weight, hectolitre weight, protein percentage, zeleny sedimentation, and wet gluten percentage values were investigated in this study. Statistically significant different results were noted among some parameters according to the results obtained from the research. The maximum seed yields were obtained from Saraybosna, Ozcan, Tosunbey, Sakin, Sonmez-2001 and Altay-2000 cultivars. The maximum thousand seed weight was obtained from the Kate-A1 variety, while the Sakin variety stood out first in terms of zeleny sedimentation trait. It has been determined that Saraybosna, Ozcan and Sakin cultivars have high seed yield and have high quality under dry farming conditions. If these cultivars are used in regional conditions, bread wheat production quantity and quality will be increased.
AtıfScopus1WoS1OpenAlex2
İncele - MakaleAçık Erişim2022Scopus SJRQ1Continuous flow microwave processing of peanut butter: A (hypothetical) computational process design study with experimental validation
Coskun, Eda; Ozturk, Samet; Topcam, Huseyin; Karatas, Ozan; Li, Rui; Wang, Shaojin; Mert, Behic; Erdogdu, Ferruh
The increase in foodborne pathogen cases in low moisture foods has raised a significant food safety concern for food industry. One of the most significant outbreaks related with these food products was observed in 2008–2009 due to Salmonella problem in peanut butter. This issue was recently observed again for a multinational case. Challenges of conventional thermal processing due to the lower thermal conductivity – diffusivity value and higher viscosity, microwave (MW) heating might be an efficient processing while the non-uniform heating is a challenging drawback. Therefore, the objective of this study was to develop a mathematical model for MW processing of peanut butter and present industrial scale designs for continuous flow processing. For this purpose, the mathematical model was first experimentally validated using a lab-scale system and validated with experimental data. Following this, continuous flow MW process design studies were carried out with different holding tube configurations to obtain a temperature increase to enable decontamination and improve the temperature uniformity. These design simulations provided a better understanding to enhance the process efficiency of high viscosity low moisture peanut butter samples and for design and optimization of continuous flow MW processing.
AtıfScopus23WoS21OpenAlex23İncele - MakaleAçık Erişim2022Scopus SJRQ2Optimization of tuned mass damper inerter for a high-rise building considering soil-structure interaction
Araz, Onur
The dynamic responses of the buildings and the optimum parameters of tuned mass damper inerter (TMDI) may change significantly when soil-structure interaction (SSI) is considered. Thus, it is necessary to consider the effect of the SSI in the optimization of TMDI. The study aims at proposing a methodology for optimization of TMDI parameters in reducing maximum structural responses of a high-rise building under earthquake considering the SSI effects. The equations of motion for time-domain analysis are derived for obtaining seismic-induced vibrations of a multi-story shear building with TMDI when the SSI is considered. An improved particle swarm optimization (IPSO) is used to obtain the optimum parameters. The aim of the optimization is to reduce the amplitude of the acceleration transfer function (ATF). The effectiveness of the optimally designed TMDI is assessed for twelve earthquake records with different frequency contents. The effect of the different mass ratios (µ), inertance ratios (β) and support conditions on control performance of the TMDI are investigated in detail. Numerical results proved that the SSI effect and the inertance ratio have a significant impact on the optimal design and effectiveness of the TMDI. From the seismic analysis results, it is seen that the controlled displacement response usually increases with the increase in the inertia ratio for both the fixed and flexible foundation, and a lower seismic response is obtained in the building controlled by TMD compared with the TMDI with different inertance ratios.
AtıfScopus40WoS41OpenAlex39İncele - MakaleAçık Erişim2022Scopus SJRQ1Radio-elemental microzonation (RELMIC): a case study of Karadeniz Technical University Campus and surroundings (Trabzon, Turkey)
Altundaş, S.; Çınar, H.
In situ radioactivity measurements were performed to describe and map the relationship between the radioactive concentration distribution on the surface and geological formations in the Karadeniz Technical University (KTU) campus and surrounding area located on the shore of the Black Sea in NE Turkey. The concentrations of radio-elements (eU, eTh, and K) and dose rate values were measured using a portable gamma-ray spectrometer with NaI(Tl) crystal at 150 points in the study area with a duration of 5 min for each measurement point. In addition, the geochemical radio-element ratios (eTh/eU, K/eU, and eU/eTh) give information about the origin of the rocks, and radiological hazard parameters for humans and the environment were also calculated. Average values of eU, eTh, and K concentrations, and dose rate, were calculated to be 3.59 ppm, 13.46 ppm, 0.84%, and 65.38 nGy/h, respectively. While the highest concentrations of radio-element and dose rate values were recorded at outcrops of Eocene-Neogene basaltic rocks and red clays, which are the weathering product of the Kabaköy formation, the lower anomaly zones coincide with brown and reddish brown forest and agricultural soils of volcanic origin in the study area. According to the average radio-element ratios, it was concluded that the rocks in the study area do not completely originate from the crust, but formed as a result of the mixture of upper mantle and continental crust. All the calculated hazard parameters seem to be lower than the internationally recommended values, and there is no cancer risk in and around the campus area.
AtıfScopus1WoS1OpenAlex1İncele - MakaleAçık Erişim2022Scopus SJRQ2Optimization insulation thickness and reduction of CO2 emissions for pipes in all generation district heating networks
Terhan, Meryem
District heating systems are provided solutions for the increasing energy problems in high-population cities. Energy costs go up depending on increasing heat loss in DHS's distribution network. Heat loss from the network consists of 5–20% of transferred energy, and this loss is higher than the other losses in the heating system. In the study, heat losses from the pipes such as supply-return pipes, hot water and circulation pipes into heat canals are investigated based on energy, exergy, economic and environmental. Optimum insulation thicknesses, energy savings, reduction of CO2 emissions, the first investment costs and payback periods of the pipes in the network of all-generation district heating systems are investigated by using Life Cycle Cost Analysis (LCCA) method for fuel types like natural gas, fuel oil and coal. Optimum insulation thicknesses are calculated for different nominal sizes of pipes and various insulation materials such as glass wool, and rock wool for the different climatic zones. According to the results of the study, the heat losses from pipes in the 4th generation DHS network are decreased between 38.19% and 33.33% from the warmest climate zone to the coldest climate zone according to the 3rd generation. Energy savings, reduction of CO2 emissions, payback periods and optimum insulation thickness values of supply and return pipes in the network are respectively changed between 7.80–98.86 $/m, 39.61–322.32 kg CO2/year, 0.028–0.38 years and 0.025–0.0105 m depending on various fuel types, insulation materials, nominal size pipes, climatic zones and all generation types.
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İncele - MakaleYalnız künye2022Scopus SJRQ4Geometric optimisation of chicanes using driving simulator trajectory data
Akgol, Kadir; Gunay, Banihan; Aydin, Metin Mutlu
Vertical traffic-calming applications may possess certain disadvantages. For instance, drivers sometimes apply a harsh brake very late or they may even prefer to accelerate rather than slow down to by-pass the suspension's shock threshold level. This has negative consequences on both vehicular and pedestrian traffic. In this study, the effects of chicanes-one of the most common horizontal speed reduction applications-on driver behaviour were examined and certain design characteristics were evaluated in the traffic laboratory of Akdeniz University in Turkey. To complete the driving tests safely and in an economical fashion, they were performed in a driving simulator. The trajectory data of some 125 drivers were saved by the simulator software. To examine these data in detail, a new method was developed using VisualLisp programming. The trajectory data were then transferred to an ArcGIS analysis program and the driving test data on the virtual chicanes were evaluated according to position and speed data. Finally, the optimum chicane design characteristics and their efficiency were determined.
AtıfScopus9WoS11OpenAlex10İncele - MakaleAçık Erişim2022Scopus SJRQ1Determination of rock quality designation (RQD) in metamorphic rocks: a case study (Bayburt-Kırklartepe Dam)
Alemdag, Selcuk; Sari, Mahmut; Seren, Aysel
The role and importance of rock mass classification systems from past to present in engineering designs are indisputable. Therefore, the correct estimation of the parameters that make up these systems is essential in terms of reliability, time, and economy. One of the crucial parameters commonly used in rock mass classification is the rock quality designation (RQD). This study aimed to indirectly estimate the RQD value determined from the core samples obtained from the exploration drillings. In this context, P wave velocity (Vp) was obtained by seismic refraction tomography (SRT) from the geophysical measurements applied in the metamorphic rock mass, and the discontinuity frequency parameter was obtained from the line survey studies carried out on the rock mass. What determined RQD values with the help of simple regression analyzes and empirical equations with high estimation capacity using Vp and discontinuity frequency parameters were obtained without drilling in the rock mass. Accordingly, the performance indexes of the equations produced by different researchers and the equations produced in this study were evaluated in determining the RQD parameter. In the generated equations, the highest coefficient of determination value depending on joint frequency and Vp wave velocity with RQD was calculated as R2 = 0.89 and R2 = 0.82, respectively. When the produced equations are evaluated according to the performance indexes, it is seen that the empirical equations obtained by previous studies have the highest root mean square error (RMSE) and values account for (VAF) values compared to the other equations and have very high estimation capacities. Thanks to the equations with high estimation capacity, the RQD value was determined depending on the joint density and Vp speeds.
AtıfScopus25WoS24OpenAlex25İncele - Derleme MakaleYayıncıda açık erişim2022Scopus SJRQ1Spatial variations of fundamental seismotectonic parameters for the earthquake occurrences in the Eastern Mediterranean and Caucasus
Ahadov, Bahruz; Ozturk, Serkan
In this study, a comprehensive statistical analysis was made for different parts of the world. For this purpose, fundamental seismotectonic earthquake parameters such as b-value, magnitude completeness, Mc-value stress distribution and moment release were analysed and their interrelationship was investigated. In this context, for the evaluation of earthquake hazard potential, spatial variations of these fundamental parameters were achieved for the Eastern Mediterranean and Caucasus since there do not exist detailed studies including these parameters for these regions of the world. The high-resolution maps of the b-value, Mc-value and stress variance were analysed in the different seismotectonic regions in the Eastern Mediterranean and Caucasus. This study considers the spatial anomalies and correlation models between the b-value, faulting styles, and stress regime and moment release. Lower b-values (b ≤ 1) were observed along with the Main Marmara Fault, eastern Turkey, western Alborz, northern Zagros, south-east Iran and the north-east Caucasus, and these small b-values indicate the active seismic region. Mc level in most of Turkey is in and around 2.8. However, Mc-value is about 3.0 in the Caucasus and about 3.5 level in Iran. This work also includes a stress inversion map in the region based on the focal mechanisms. The normal, strike-slip and a few thrust fault solutions were observed in the research areas. The results show that a combination of these parameters may supply preliminary tools for future researches. Consequently, the spatial pattern of the b-values, moment releases and stress regimes can be used as considerable promise for the predicting of forthcoming seismic hazard regions.
AtıfScopus15WoS10OpenAlex15İncele - Kitap BölümüYalnız künye2022Dynamics of self-belief to fight against climate change: Evidence from European social survey
Popescu, Cristina Raluca Gh.; Kocağ, Esra Karapinar
All prominent leaders, managers, researchers, and specialists worldwide position the positive and constructive contributions for Sustainable Development Goals (SDGs) in the centre of their activities and interests due to the power that the international community holds in reaching all SDG targets and achieving a global partnership for sustainable development (SD). The focal point of this study is represented by individuals' self-belief to fight against climate change and utilizes valuable data from the European Social Survey (ESS) Wave 10 in 2020 on two main areas: the impact that large numbers of people limiting their energy use might have on climate change and the causes of climate change which could be represented by natural processes, human activity, or both. The findings show that more than half of those individuals in the sample are taking bold and transformative steps towards a better future for all choosing sustainability, being more likely to have positive attitudes about individual efforts to control climate change, centering on reducing their energy consumption.
AtıfScopus1OpenAlex1İncele - MakaleYalnız künye2022Scopus SJRQ1Numerical studies on axially loaded doubler plate reinforced elliptical hollow section T-joints
Saria, Busra; Ozyurt, Emre
This paper presents results of numerical studies completed on unreinforced and doubler plate reinforced Elliptical Hollow Section (EHS) T-joints subjected to axial compressive loading on the brace member. Non-linear finite element (FE) models were developed using the finite element code, ABAQUS. Available test data in literature was used to validate the FE models. Subsequently, a parametric study was carried out to investigate the effects of various geometrical parameters of main members and reinforcement plates on the ultimate capacity of reinforced EHS T-joints. The parametric study found that the reinforcing plate significantly increases the ultimate capacity of EHS T-joints up to twice the capacity of the corresponding unreinforced joint. The thickness and length of the reinforcing plate have a positive effect on the ultimate capacity of Type 1 joints. This study, however, found that the capacity of Type 1 orientation is not dependent on the brace-to-chord diameter ratio. As for type 2 orientations, the thickness and length of the reinforcement have a minimal effect on the ultimate capacity. A new design method is introduced to predict the capacity of the reinforced EHS T-joints Type 1 and 2 based on the multiple linear regression analyses.
AtıfScopus5WoS6İncele - Derleme MakaleYalnız künye2022Scopus SJRQ1Comprehensive review on distributed maximum power point tracking: Submodule level and module level MPPT strategies
Başoğlu, Mustafa Engin
Maximum power point tracking (MPPT) procedure in photovoltaic (PV) systems can be realized with many different methods. Especially in arrays consisting of PV modules (PVMs) connected in series; the maximum power point (MPP) may change due to partial shading conditions (PSC), aging, degradation, fabrication production differences etc. In addition, even in small power systems containing a single PVM, the difference in shading and irradiation between submodules affects the maximum power potential of the PVM. In this study, power electronics-based power processing methods in distributed MPPT (DMPPT) systems are emphasized. Power electronics-based hardware MPPT solutions are examined in two groups as full power processing (FPP) and differential power processing (DPP). In addition, commercially available power optimizers have been examined under many criteria. The literature on the subject has been analyzed in a broad perspective, and it has been comprehensively evaluated according to criteria such as power processing level, converter configuration, MPPT algorithm, MPPT application level and control approaches. This study is an important guide for scientists and hardware engineers doing academic studies on the subject. This study, which examines the topologies and control approaches used in application-oriented studies, has the feature of triggering future studies. The features that commercial power optimizers should have and the examination of the products in the market within the framework of some criteria is one of the original aspects of the study. It is expected that this study will contribute to the PV industry in building applied and building integrated studies, where extreme shading scenario occurs.
AtıfScopus62WoS41OpenAlex56İncele - MakaleYalnız künye2022Scopus SJRQ1Investigation of physiological and psychological effects of robotic cat and betta fish therapies in hemodialysis patients: A randomized controlled study
Demirağ, Hatice; Hintistan, Sevilay
Aims: This randomized controlled study was conducted to investigate the physiological and psychological effects of pet therapy in hemodialysis patients. Background: Pet therapy has both physiological and psychological effects on individuals with chronic diseases. However, to the best of our knowledge, no studies have examined the physiological and psychological effects of pet treatment in hemodialysis patients worldwide. Design: A randomized controlled study. Methods: The study was completed with 18 robotic cats, 18 Betta fish, and 18 control group patients. The data were collected at XXX State Hospital between May and September 2021 using data collection tools. Robotic pet treatment was applied to the robotic cat group for 20 min a week for two months during hemodialysis. The Betta fish group was allowed to keep Betta fish at home for two months, and they were followed for another two months. The data were evaluated in the Statistical Package for Social Sciences 23.0 package program. The study was registered on Clinical Trials (NCT05339711). Results: During robotic cat therapy, patients' loneliness and dialysis symptoms decreased, and happiness and treatment adherence to the end-stage renal disease (ESRD) increased; In the post-test follow-up, in the first measurement, the treatment adherence to the ESRD decreased, the loneliness and dialysis symptoms increased, the happiness did not change; In the second measurement of the post-test, happiness, and treatment adherence to ESRD decreased, loneliness and dialysis symptoms increased. During Betta fish therapy, patients' body mass index, happiness, and treatment adherence to ESRD increased, loneliness and dialysis symptoms decreased; in the first measurement, and loneliness, dialysis symptoms, body mass index, and treatment adherence to the ESRD increased; In the second measurement, loneliness, dialysis symptoms increased, body mass index and happiness decreased. Conclusions: The study revealed that Robotic cat and Betta fish therapies had positive physiological and psychological effects in hemodialysis patients, and these effects were different from each other.
AtıfScopus12WoS11OpenAlex12İncele - MakaleAçık Erişim2022Scopus SJRQ1SUPPLIER SELECTION BY INTEGRATED IFDEMATEL-IFTOPSIS METHOD: A CASE STUDY OF AUTOMOTIVE SUPPLY INDUSTRY
Gergin, Ramazan Eyüp; Peker, Iskender; Kısa, A. Cansu Gök
Selecting the best supplier emerges as a crucial subject for all sectors to achieve long term collaborations in supply chains. This study object to select the most suitable supplier for a company engage in activities in the automotive supply industry. For this purpose, a five-stage Intuitionistic Fuzzy Multi-Criteria Decision Making (IFMCDM) model is conducted. Firstly, decision criteria are defined by literature research and expert group opinions. Secondly, the importance weights of these criteria are obtained by IF Decision Making Trial and Evaluation Laboratory (IFDEMATEL). Followingly, the most suitable supplier is assessed by IF Technique for Order Preference by Similarity to Ideal Solution (IFTOPSIS). In the fourth stage, Sensitivity Analysis is utilized to analyze the effect of differentiation in criterion. Lastly, a comparative analysis is carried out. The results of the study has pointed that “Price” is the most important criterion in supplier selection and “Supplier 4” is the best alternative for this case. Main contribution of this study is to integrate IFDEMATEL-IFTOPSIS method for the first time in automotive supplier selection literature and propose a specific decision framework. In addition, proposed model is found robust and valid.
AtıfScopus39OpenAlex39İncele - MakaleAçık Erişim2022Scopus SJRQ3Homotopy Perturbation Elzaki Transform Method for Obtaining the Approximate Solutions of the Random Partial Differential Equations
Anac, Halil; Merdan, Mehmet; Kesemen, Tulay
The series solutions of the random nonlinear partial differential equations have been examined by a hybrid method. The random nonlinear partial differential equations are studied by both normal and uniform distributions. Two initial-value problems are indicated to exemplify the influence of the solutions acquired by the hybrid method. Also, the functions for the first and second moments of the approximate solutions of random nonlinear partial differential equations are acquired in the MAPLE software. The hybrid method is implemented to analyze the solutions of the random nonlinear partial differential equations. MAPLE software is used to find the solutions. Besides, MAPLE software is used for the drawing the figures.
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İncele - MakaleYalnız künye2022Scopus SJRQ1Alleviating the Impact of the Barriers to Circular Economy Adoption Through Blockchain: An Investigation Using an Integrated MCDM-based QFD With Hesitant Fuzzy Linguistic Term Sets
Erol, Ismail; Murat Ar, Ilker; Peker, Iskender; Searcy, Cory
Despite its clear potential to contribute to sustainability, there are many challenges to adopting circular economy (CE). These barriers impede the implementation of CE; however, research to address them is ongoing. For example, novel technologies have become a key enabler for easing the impact of CE adoption barriers. Blockchain is one disruptive technology that has the potential to address some of those barriers, notably technological, organizational, and ecological. Blockchain is particularly well suited to help address supply chain-oriented barriers to CE adoption. However, a review of the literature shows that while there are a limited number of conceptual studies that address the capabilities of blockchain to alleviate the impact of the barriers to CE, no previous study has focused on this vital subject using a decision tool based on expert data. To this end, this paper proposes an integrated decision framework involving Multi-Criteria Decision-Making (MCDM)-based Quality Function Deployment (QFD) method with Hesitant Fuzzy Linguistic Term Sets (HFLTS) to investigate the true potential of blockchain to address the CE adoption barriers. Our findings indicate that enhanced supply chain traceability management, improved collaboration and coordination in supply chain ecosystems, building higher levels of trust in supply chain ecosystems, and enhanced business models are the most significant functions of blockchain to help overcome the CE adoption barriers.
AtıfScopus97WoS88OpenAlex102İncele - MakaleYayıncıda açık erişim2022Scopus SJRQ2Producing maximally entangled Bell type states in an efficient way for quantum teleportation
Çelik, Necati; Ünal, Nüket
In quantum teleportation, the sender must interact her/his qubit to one of the qubits in a maximally entangled Bell/Bell-type state and as a result, a joint state is obtained. This joint state has to be rearranged in terms of the appropriate number of Bell/Bell-type states. Then the sender measures her/his qubits and sends the results via a classical channel to the receiver. According to the outcome of the measurement results, the receiver applies appropriate gates to the qubits in her/his share to recover the teleported state. Perhaps the most important step in this protocol is to be able to rewrite the joint state in terms of the appropriate number of Bell-type states. An efficient way to produce Bell-type states for quantum teleportation of an arbitrary n-qubit state is proposed. Quantum teleportation of an arbitrary three-qubit state is studied as an example.
AtıfScopus1WoS1OpenAlex2İncele - MakaleAçık Erişim2022Scopus SJRQ1Late Jurassic Paleotethyan oceanic slab break-off revealed by Sr-Nd-Hf isotopes of Na-rich adakitic granites from northwestern Turkey
Karsli, Orhan; Şengün, Fırat; Santos, José Francisco; Uysal, İbrahim; Dokuz, Abdurrahman; Aydin, Faruk; Kandemir, Raif
The Mesozoic geodynamic evolution of the Paleotethys Ocean is critical but a poorly known piece of the geological history of the Sakarya Zone, north Turkey. Here, we describe new integrated research of zircon U-Pb geochronology, bulk-rock major-trace element and Sr–Nd isotopes as well as Hf isotope of zircons from the granitic rocks of the Demirköy and Kızıldamlar plutons located in Bilecik area along the western Sakarya Zone, northwestern Turkey. Zircon U–Pb ages obtained by LA-ICP-MS reveal that the granitic magma intruded into the basement rocks during the Late Jurassic (ca. 162–157 Ma). The granites are tholeiitic and show slightly metaluminous to peraluminous geochemical affinities. The granite samples are adakitic, having relatively high Na2O (6.35–7.58 wt%) and Sr (172–580 ppm), and low K2O (0.39–1.13 wt%) and Y (3.2–5.3 ppm), and thus have high Sr/Y (70–250). The samples exhibit enrichment of light rare earth elements (REE) and large ion lithophile elements (LILE) and depletion in heavy REE and the high field strength elements (HFSE; e.g., Nb, Ti, Ta). The samples possess low 87Sr/86Sr(t) values of 0.70313 to 0.70372, and εNd(t) of −0.66 to +9.24. Zircon grains exhibit positive εHf (t) values of 5.0 to 12.8 and depleted mantle model ages of Hf (TDM1 = 0.24 to 0.68 Ga). These geochemical features and Sr–Nd–Hf radiogenic isotope systematics reveal that the adakitic rocks were likely formed by low degree melting (<10%) of the eclogitic part of an oceanic slab and subsequent melt fractionation and crustal contamination. An ongoing subduction scenario cannot explain the formation of the investigated adakitic rocks. We suggest that the adakitic plutons were generated through slab break-off after the final closure of the Paleotethys Ocean throughout the Late Jurassic (ca. 162–157 Ma). Considering the previous data, the continental back-arc basin system, leading to the opening of Neotethys Ocean at the southern margin of the continent, has been put forward to decipher the Late Jurassic tectonic evolution of the Paleotethys Ocean and the western Sakarya Zone.
AtıfScopus14WoS14OpenAlex13İncele - MakaleAçık Erişim2022Scopus SJRQ3The Determinants of Immigrants’ Skill Composition
Karapınar Kocağ, Esra; Li, Yutong; Popescu, Cristina Raluca Gh.
Movements of labor across the world is an ongoing debate in the literature in terms of its drivers and results in sending and receiving areas. Skill composition of immigrant labor has been discussed by several papers, although they generally focused on visa policies or firm level productivity. However, this paper focuses on the relationship between immigrants’ educational attainment and government budgeting on research and development (R&D). Panel data analysis is applied for European countries, along with instrumental variable approach as a robustness check. Findings reveal that higher budget allocation for R&D is associated with higher skill level of immigrants within overall immigrant population. This finding is driven by young immigrants whose ages are between 25 and 34 and female immigrants in these countries, suggesting that this relationship varies among sub-groups of immigrants, which would have significant policy implications. Hence, the novel and original approach of the paper resides in the deciding factors of immigrants’ skill composition.
AtıfScopus1İncele - MakaleYalnız künye2022Scopus SJRQ2The two-way perspective of tourism undergraduates towards (post-)viral world: The future of tourism, and vocational development and career
Seyitoğlu, Faruk; Atsız, Ozan; Kaya, Fazıl; Taş, Sedat
This timely paper explores the future of tourism and vocational career in the Covid-19 period from the perspective of undergraduate tourism students. The data were collected through semi-structured interviews with 30 students majoring in tourism faculty departments following the qualitative methodology. The findings demonstrate that vocational development and career planning in the Covid-19 era and the future of tourism are the main dimensions identifying students’ perspectives. The vocational and psychological pandemic effects are shaping the future career decisions of students. Furthermore, the future of tourism includes the elements related to tourist expectations and behaviours and trends in the (post-)viral tourism.
AtıfScopus23WoS16OpenAlex25İncele - MakaleAçık Erişim2022Scopus SJRQ3Women Entrepreneurs' Education Level, Political Skill, and Firm Performance: Political Influence and Human Capital Theories
Demirbaǧ, Orkun; Demirbaǧ, Kübra Simşek; Batl, Gülgönül Bozoǧlu
Purpose: Because of the growing interest in the literature in education and political skill as facilitators of firm performance, this article aims to reveal whether there is a moderating role of women entrepreneurs' political skill on the relationship between their education level and firm performance when firm- and entrepreneur-level characteristics remain under control. Methodology: The study was conducted in Istanbul, Kocaeli, and Bursa, cities with the lowest gender gap in Turkey. The participants of the questionnaires were 291 entrepreneurs who are members of the Women Entrepreneurs Association of Turkey (KAGIDER), the Women Entrepreneur Members of Endeavor Turkey, and the TOBB Women Entrepreneurs. Hierarchical regression analysis was performed to analyze the dataset. Findings: When firm- and the entrepreneur-level characteristics remain under control, women entrepreneurs' political skill shows a moderator role in the relationship between women entrepreneurs' education level and firm performance. Practical Implications: A bachelor's degree or higher, along with political skill, allow women entrepreneurs to increase their firm performance. Furthermore, the higher the political skill, the higher the effect of education level on firm performance. Originality/Value: This is the first study to investigate the moderating role of political skill of women entrepreneurs in the relationship between education level and firm performance. Moreover, political influence and human capital theories are jointly applied to the theoretical model.
AtıfScopus4WoS2OpenAlex5İncele