Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Dertli, Enes(10)
- Bayram, Ozkan(8)
- Elban, Mehmet(6)
- Simsek, Onder(5)
- Sorkun, Kadriye(5)
- Yazici, Sinan(5)
- Battal, Fetullah(4)
- Bayram, Nesrin Ecem(4)
- Cuce, Erdem(4)
- Erdogan, Ummugulsum(4)
- Pabuçcu, Hakan(4)
- Tozlu, Alperen(4)
- Yıldırım, Gürkan(4)
- Yıldız, Şaduman(4)
- Özahi, Emrah(4)
- Abuşoğlu, Ayşegül(3)
- Başar, Enes Emre(3)
- Can, Ömer(3)
- Cokkizgin, Alihan(3)
- Demirtas, M.(3)
- Dolgunsöz, Emrah(3)
- Girgel, Umit(3)
- Guney, Harun(3)
- Güzel, Ferdi(3)
- Igman, Erdal(3)
- Kaya, Metin(3)
- Korkmaz, Özge(3)
- Purcek, G.(3)
- Selvitopu, Abdullah(3)
- Sert, Durmuş(3)
- Tekin, Ilker(3)
- Töman, Ufuk(3)
- Yanar, H.(3)
- Yildirim, Serkan(3)
- Çölkesen, Mustafa(3)
- Şahin, Abdulgani(3)
- Şahin, Bünyamin(3)
- Agar, Guleray(2)
- Akkan, Yaşar(2)
- Akın, Nihat(2)
Yayınlar
- Kitap BölümüYalnız künye2018Scopus SJRQ3Contribution of the cogeneration systems to environment and sustainability
Kemal, Çomakli; Uğur, Çakir; Ayşegül, Çokgez Kuş; Erol, Şahin; Aloui, F; Dincer, I
The kind of energy that buildings need changes, like heating energy, cooling energy, electrical energy, and thermal energy for hot top water. Usually, the processes or systems that produce thermal energy emit pollutants while they produce heat because of the fossil fuels they use. A lower consumption of thermal energy will contribute not only to a reduction in the running costs but also in the reduction of pollutant emissions that contribute to the greenhouse effect and a lesser dependence of the hospital on the external power supply. Cogeneration or CHP (combined heat and power) is the system that produces power and usable heat simultaneously. Combined production of mechanical or electrical and thermal energy using a simple energy source, such as oil, coal, natural or liquefied gas, biomass, or the sun, affords remarkable energy savings and frequently makes it possible to operate with greater efficiency when compared to a system producing heat and power separately. Because of the life standard of humanity in new age, energy sources must be continually improved and updated. For this reason, the installation of a system for the simultaneous generation of electrical, heating, and cooling energy would be one of the best solutions if we want to have qualified energy and reduce investment and operating costs and meet ecological requirements. This study aims to bring out the contributions of cogeneration systems to the environment and sustainability by saving the energy and reducing the emissions.
AtıfOpenAlex1
İncele - MakaleAçık Erişim2018Scopus SJRQ1Investigation of seismic performance of in-plane aligned masonry panels strengthened with Carbon Fiber Reinforced Polymer
Can, Ömer
Masonry structures are economical, easy to construct and has important advantages such as the use of natural materials. In Turkey, these structures have been heavily built especially with traditional construction methods and nowadays they are popular as well. Therefore, the reinforcement of masonry structures and seismic safety are of paramount importance. Masonry walls are not naturally stable and cannot be considered as homogeneous structures so it is difficult to predict their behavior under load by using numerical methods. Supportive framework of the mathematical model and the data of the experimental studies are required. In this study, 36 wall blocks were prepared in 900 × 900 × 200 mm using hollow masonry brick, blend brick and aerated concrete and these blocks are reinforced with Carbon Fiber Reinforced Polymer in both directions by using three different methods. For the analysis of retrofit brick walls produced and reinforced with different materials, ASTM E591 test method was used. At the end of the experiment period; shear strength performances of the reinforcement methods of the elements, their deformation and energy dissipation capacities were evaluated. According to results, maximum shear strength performance was observed at the masonry panel strengthened by two face. Maximum load value was 172.63 Kn. Also maximum dissipation capacity was observed at the masonry wall reinforced with CFRP covered diagonally. Maximum energy dissipation capacity was 317.1 J.
AtıfScopus32WoS26OpenAlex34İncele - MakaleYalnız künye2018Scopus SJRQ2Changes of surface properties of calcite particles with calcium stearate using conventional experimental design and properties of coated calcite
Ucurum, Metin; Bayram, Ozkan; Toraman, O. Yusuf; Kilic, Habibe; Yalcin, Seyma
Calcite is utilized as a filler mineral in the industries such as plastics, rubber, and paint, to gain products with a variety of features. In order to use a calcite ore as a filler, some specific physical and physico-chemical properties are required such as ultra-fine sizes and conversion of hydrophilic to hydrophobic structure. In the present study, for these purposes, surfaces of the ultra-fine calcite powder (d50=2.94 μm) were coated by a mechano-chemical process with calcium stearate [Ca(C17H35COO)2] in a stirred ball mill. The influence of operating parameters such as calcite filling-ratio, ball-filling ratio, operation speed, grinding time and chemical dosage on the active ratio (%) was systematically examined. Then, the properties of modified calcite product were measured and evaluated by contact angle, TGA, DTA, FTIR, and SEM. The results showed that the mechano-chemical technology is very effective for modifying the surface of micronized calcite products using calcium stearate chemical.
AtıfScopus20WoS18İncele - MakaleYalnız künye2018Scopus SJRQ3Width, length, and height conceptions of students with learning disabilities
Güven, N. Dilşad; Argün, Ziya
Teaching responsive to the needs of students with learning disabilities (LD) can be provided through understanding students’ conceptions and their ways of learning. The current research, as a case study based on qualitative design, aimed to investigate the conceptions of students with learning disabilities with regard to the different representations of length (width, length, and height). The participants were 3 Turkish students at 4th, 5th and 6th grades recognised by the local Counselling and Research Centre (CRC) as having learning disabilities. The data were collected through semistructured and task-based interviews, and analysed via content analysis method. The findings suggest that width, length, and height conceptions of students with learning disabilities are influenced by their conceptions of length and visual-spatial abilities.
AtıfScopus9İncele - MakaleYalnız künye2018Scopus SJRQ1Thermodynamic and thermoeconomic analyses of an organic Rankine cycle adapted gas turbine cycle using S-CO2 ; [Organik Rankine çevrimi entegre edilmiş S-CO2 kullanılan bir gaz türbin çevriminin termodinamik ve termoekonomik analizi]
Tozlu, Alperen; Özahi, Emrah; Abuşoğlu, Ayşegül
In this study, a model of an organic Rankine cycle (ORC) adopted gas turbine cycle using supercritical CO2 (S-CO2) as working fluid is performed. Thermodynamic analyses of a system are carried out using Aspen Plus and EES programs. As a result of thermodynamic analyses, electricity production capacity, energy and exergy efficiencies of the proposed system are evaluated as 1530.88 kW, 23.30% and 59.60%, respectively. For the thermoeconomic analysis of the system, specific exergy costing method, SPECO, is applied as widely used one among the second law based methods. Unit exergetic cost of electricity production for 1 kWh is found to be 7.28 ¢ and the total cost of electricity production for 1530.88 kWh is found to be 114.43 $. Annual return from the system of ORC adopted gas turbine cycle using S-CO2which has the total investment cost of 3,033,300 $ is evaluated as 741,146 $ taking into account the difference between the cost of electricity production and the sale price of electricity. As a result of the thermoeconomic analysis, the payback period of the system is found to be 4.09 years. Purpose: To propose a model (an organic Rankine cycle (ORC) adopted gas turbine cycle using supercritical CO2: S-CO2) for an existing solid waste power plant in the frame of the heat recovery (Waste-to-energy). Theory and Methods: Thermodynamic and thermoeconomic analyses were utilized for the proposed model in order to evaluate the energy and exergy efficiencies. Results: The energy and exergy efficiencies of the system were calculated as 23.30 % and 61.60 % respectively. 1 kWh of electricity generated from GT-ORC system is produced to 7.28 ¢. The total electricity production cost of 1530.88 kW-hours was calculated as $ 111.43. Conclusion: The total cost of the developed GT-ORC system is $ 3,033,300. The difference between the cost of electricity generated from the GT-ORC system and the cost of the electricity sales is expected to be $ 741,146 annually for the proposed GT-ORC system. As a result of this profit, the payback period of the system was calculated as 4.09 years.
AtıfScopus8İncele - MakaleYalnız künye2018Scopus SJRQ1Vibration and stability analysis of functionally graded sandwich beams by a multi-layer finite element
Kahya, Volkan; Turan, Muhittin
This paper presents a finite element model based on the first-order shear deformation theory for free vibration and buckling analyses of functionally graded (FG) sandwich beams. The present element has 3 N + 7 degrees-of-freedom for an N-layer beam. Lagrange's equations are employed for derivation of the equations of motion. Two types of FG sandwich beams are considered: (a) Type A with FG faces and homogeneous ceramic core, and (b) Type B with homogeneous ceramic and metal faces and FG core. Natural frequencies and buckling loads are calculated numerically for different boundary conditions, power-law indices, and span-to-height ratios. Accuracy of the present element is demonstrated by comparisons with the results available, and discussions are made on the results given in graphs and tables for the sandwich beams considered.
AtıfScopus89WoS81OpenAlex81İncele - MakaleAçık Erişim2018Scopus SJRQ2The assessment of knowledge economy efficienccomparing Turkey with the European Union countries; [Procjena učinkovitosti ekonomije znanja: Usporedba turske s državama Europske Unije]
Ayan, Tuba Yakıcı; Pabuçcu, Hakan
Knowledge economy is an economy that produces, distributes and uses information. Nowadays, investment in quality information rather than capital inputs is becoming more and more important for countries to develop and to be able to compete with each other. The increasing speed in the creation and spreading of knowledge has made it a crucial component in economic development. It is a fact that the countries that make large investments in information factors experience a fast and sustainable growth and are the most dynamic and competitive countries in the world. In this paper, we use context dependent DEA to measure the relative efficiency of the European Union (EU) countries’, including Turkey, knowledge economy policy based on 2016 data. In addition, we implement factor-specific DEA in order to identify achievable targets in short term for each output of countries. Four outputs and three inputs were used in the analysis. The results showed that Germany is clearly ahead of other countries such as France, England, Malta and the Netherlands. Turkey, on the other hand, separates from other countries and is the least efficient one. The reason for this separation is that Turkey produces less output than expected relative to its facilities. Another conclusion of the paper is that the countries’ patent applications and high-tech exports are more inefficient than other knowledge economy outputs.
AtıfScopus2WoS2İncele - MakaleAçık Erişim2018Scopus SJRQ2Effect of different levels of grapeseed (Vitis vinifera) oil addition on physicochemical, microbiological and sensory properties of set-type yoghurt
Mercan, Emİn; Sert, Durmuş; Karakavuk, Emrah; Akın, Nİhat
The aim of this study was to determine the effect of different concentrations of grapeseed oil (GSO) addition (0.5%, 1% and 1.5% w/v) to yoghurt milk on survival of starter bacteria, and physicochemical, textural and sensory properties of set-type yoghurts during the 21 days of storage. Moreover, radical scavenging activity (RSA) and total phenolic content (TPC) of yoghurts were investigated. Yoghurts containing GSO exhibited significantly higher TPC and RSA as compared to control yoghurts. The results obtained from this investigation show that GSO has a potential to be used as a food supplement to improve health-promoting properties of yoghurt.
AtıfScopus17WoS15OpenAlex16İncele - MakaleAçık Erişim2018Scopus SJRQ2Effect of grain refinement and phase composition on room temperature superplasticity and damping capacity of dual-phase Zn-Al alloys
Demirtas, Muhammet; Atli, Kadri C.; Yanar, Harun; Purcek, Gencaga
The effects of grain refinement and phase composition on superplasticity and damping capacity of eutectic Zn-5Al and eutectoid Zn-22Al alloys were investigated. For grain refinement, equal-channel angular pressing (ECAP) was applied to these alloys. ECAP completely eliminated the as-cast lamellar microstructures of both alloys and resulted in ultrafine-grained structures along with room temperature superplasticity. Furthermore, these microstructural changes with ECAP increased the damping capacity of both alloys in the dynamic hysteresis region, where damping arises from viscous sliding of phase/grain boundaries. Dynamic recrystallization at the surface and thermally activated viscous motion of grain/phase boundaries at the subsurface of the samples of both alloys were proposed as the damping mechanisms in the region where the alloys showed combined aspects of static/dynamic hysteresis damping behavior. Although the grain size is larger in Zn-5Al compared to Zn-22Al, it showed higher damping capacity due to the different sliding characteristics of its phase boundaries.
AtıfScopus14WoS11OpenAlex14İncele - MakaleYalnız künye2018Scopus SJRQ43-D simulation of simultaneous heat and mass transfer of apple
Turkan, B.; Canbolat, A.S.; Etemoglu, A.B.
Drying is a complex process associated with the coupled mechanism of heat and mass transfer which plays an important role in almost all industrial sectors. For this reason, the intensive research on drying is carried on specially based on optimisation of energy and process control. The aim of this study is to present a numerical method for drying processes widely used in food industries to provide enhanced product quality and economically advantages at definite production conditions. The governing equations of drying process in a 3-D rectangular object (e.g. apple slices) are solved numerically to predict the temperature and moisture distributions inside the object. Then, statistical tests of agreement between results are performed by determining the coefficient of regression (R2), chi-square test (2) and standard error of estimate (SEE) values, and it is found that predicted results agree well with the results in literature. Finally, a parametric study is conducted to emphasize the role of parameters on food drying as an important contributor to energy consumption.
AtıfScopus2İncele - MakaleAçık Erişim2018Scopus SJRQ3Qualitative and quantitative structure-activity relationships studies of quercetin derivatives as chemotherapeutic activity
Rouane, Abderrahmane; Tchouar, Noureddine; Kerassa, Aicha; Cinar, Mehmet; Belaidi, Salah
Qualitative and Quantitative structure activity relationship (SAR/QSAR) analysis was applied to eighteen Quercetin derivatives using a combination of various physicochemical, steric, electronic, and structural molecular descriptors. A multiple linear regression (MLR) procedure was used to model the relationships between molecular descriptors and the chemotherapeutic activity of the Quercetin derivatives. The stepwise regression method was used to derive the most significant models as a calibration model for predicting the inhibitory activity of this class of molecules. The best QSAR models were further validated by a leave one out technique as well as by the calculation of statistical parameters for the established theoretical models. High agreement between experimental and predicted inhibitory values, obtained in the validation procedure, indicated the good quality of the derived QSAR models.
AtıfScopus3OpenAlex3İncele - MakaleAçık Erişim2018An investigation into the learning of ecological concepts
Toman, Ufuk
The aim of this research; secondary, high school and university levels of the students to understand the concepts related to ecology of Bayburt in Turkey. In this study, a progressive research method was used. In this method, conceptual understanding test was used as data collection tool. Open-ended test questions were used in this study. The test consisted of 150 students, 50 were from the secondary school, 50 were from the high school and 50 from the university in Bayburt. The data obtained from the test indic ate that the meanings of the ecological concept are in different categories and that this concept is not fully understood by the students at all three levels of learning. While students at secondary level relate the concepts related to ecology to their everyday use, high school and university students have more scientific definitions in their descriptions. In addition, misconceptions regarding these concepts have been identified at all levels of learning.
AtıfScopus4OpenAlex5İncele - MakaleYalnız künye2018Scopus SJRQ2Infinitely many solutions for a class of stationary Schrödinger equations with non-standard growth
Ayazoglu (Mashiyev), R.; Alisoy, Gulizar
In this paper, we study the existence of infinitely many solutions for a class of stationary Schrödinger type equations in ℝN involving the p(x)-Laplacian. The non-linearity is superlinear but does not satisfy the Ambrosetti-Rabinowitz type condition. The main arguments are based on the geometry supplied by Fountain Theorem. We also establish a Bartsch type compact embedding theorem for variable exponent spaces.
AtıfScopus2WoS1OpenAlex2İncele - MakaleAçık Erişim2018Scopus SJRQ1Glucan type exopolysaccharide (EPS) shows prebiotic effect and reduces syneresis in chocolate pudding
İspirli, Hümeyra; Demirbaş, Fatmanur; Dertli, Enes
Exopolysaccharides (EPS) of lactic acid bacteria are important biopolymers that can improve the physicochemical properties of food products and act as prebiotics. In this study the physicochemical role and the prebiotic effects of a glucan type EPS with (α1-3) and (α1-6) linkages were assessed in chocolate pudding containing Lactobacillus rhamnosus GG as a probiotic strain. The functions of EPS were determined by developing three different formulations: control, probiotic (Lactobacillus GG) and symbiotic pudding (Lactobacillus GG + EPS) samples. The pH and acidity of the symbiotic pudding sample were higher than the probiotic and the control samples during the 28-day of storage period. Similarly, an important level of increment in Lactobacillus GG levels in symbiotic sample was observed compared to the probiotic sample suggesting the prebiotic role of the α-glucan. Importantly, the syneresis in symbiotic pudding sample reduced significantly compared to other pudding samples which is related with the physicochemical role of glucan type EPS. This study reveals the prebiotic and physicochemical roles of α-glucan type EPS in a chocolate pudding model.
AtıfScopus33WoS28OpenAlex35
İncele - Derleme MakaleAçık Erişim2018Scopus SJRQ1Concentrating photovoltaic thermal (CPVT) collectors and systems: Theory, performance assessment and applications
Daneshazarian, Reza; Cuce, Erdem; Cuce, Pinar Mert; Sher, Farooq
Concentrating photovoltaic thermal (CPVT) collectors and systems are very popular in both domestic and industrial solar energy applications. CPVT collectors provides incomparably greater thermal and electrical outputs compared to stand alone PV or hybrid PVT systems as incoming solar energy is maximised inside the unit via energy-efficient concentrators. Within the scope of this paper, a comprehensive review on CPVT collectors and systems is proposed. For an easier assessment of the findings through state-of-the-art analyses on CPVT collectors, the review is presented in a thematic way. Historical overview of the technology is followed by the detailed description of a CPVT collector with main system elements and thermodynamic performance definitions. The review also covers thermal and electrical performance analysis of CPVT collectors using water or air as working fluid, analytical, numerical, simulation and experimental works for performance evaluation of different design configurations of CPVT systems and qualitative analysis of electrical and thermal energy generation. The impacts of concentrator type and concentration ratio on system efficiency, operating temperature and coefficient of performance (COP) are analysed in detail. It is observed from the findings that CPVT collectors are promising devices in market, and they have a good potential to be competitive with conventional power generation systems in the near future.
AtıfScopus193WoS174OpenAlex214İncele - MakaleYalnız künye2018Scopus SJRQ1The effects on performance, combustion and emission characteristics of DICI engine fuelled with TiO2 nanoparticles addition in diesel/biodiesel/n-butanol blends
Örs, I.; Sarıkoç, S.; Atabani, A.E.; Ünalan, S.; Akansu, S.O.
In this study, waste cooking oil biodiesel was mixed with titanium dioxide (TiO2), a metal-based nano particle, and n-butanol (C4H9OH) along with euro diesel to examine their effects on diesel engines. Various ratio of fuel blends were prepared with TiO2 nano particles-diesel-biodiesel and n-butanol. The tests fuels were euro diesel (D100), biodiesel (B100), B20, B20 + TiO2, B20But10 and B20But10 + TiO2, respectively. Thermo-physical properties such as density, pour point, cloud point, cold filter clogging point, flash point and kinematic viscosity of all test fuels were determined followed by investigating engine performance parameters such as torque, power, fuel consumption and etc. Combustion analysis was also investigated. In addition, the effects on emissions such as CO, CO2, HC, NO and smoke opacity were also carried out. The addition of n-butanol to the fuel blends substantially affected density, kinematic viscosity and cold flow properties, while the addition of TiO2 has not much effect on these properties. For all tested fuels, the maximum brake engine torque and power were recorded at approximately 1400 rpm and 2800 rpm, respectively. The addition of TiO2 increased the brake engine torque and power 10.20% and 9.74% and decreased the brake specific fuel consumption 27.73% and 28.37%, respectively compared to blends without TiO2 additive. TiO2 additive increases the maximum cylinder pressure and heat release rate, as a result improved the engine performance and combustion. The addition of n-butanol in the fuel blend increased the maximum cylinder pressure and heat release rate values in comparison to euro diesel. The results of exhaust emission showed a decrease in CO, HC and smoke opacity emissions, whereas increased CO2 and NO emission, except the use of n-butanol reduced the values of NO emission, in comparison to euro diesel and without TiO2 additive. The results show that biodiesel produced from waste cooking oil, n-butanol and TiO2 additive can be used in diesel engines at certain proportion and that the additive materials improve the combustion characteristics, engine performance and exhaust gas emission.
AtıfScopus231WoS193OpenAlex246İncele - Kitap BölümüYalnız künye2018Relationship between entrepreneurship and organization of akhism
Esmer, Yusuf; Yükse, Muhammet
Foreign direct investment, as an important instrument of economic development for developing countries, provides employment, technology transfer and productivity improvement by eliminating the capital deficiency in these countries. In recent years, foreign direct investments have increased considerably in developing countries. This increase makes it necessary to investigate the determinants of foreign direct investment. This paper focuses particularly on globalization and institutional quality variables that determine foreign direct investment using panel data of 48 developing countries from 1996 to 2015. The results suggest that globalization and institutional quality have a positive effect on foreign direct investment.
AtıfScopus1İncele - MakaleAçık Erişim2018Scopus SJRQ2The effect of government educational expendituron labor productivity in turkish manufacturing sector; [Utjecaj vladinih rashoda za obrazovanje na produktivnost rada: Ne-linearni ardl pristup na turski proizvodni sektor]
Durmaz, Atakan; Pabuçcu, Hakan
Labor productivity is very important phenomena to maintain the sustainable economic growth. Actually, there are many studies in the economic literature about determining the factors affecting labor productivity. At this point, this study aims to investigate the relationship between labor productivity and government educational expenditure by using the data covering the period of 1971-2015 for Turkey. To this aim, it is applied linear and non-linear autoregressive distributed lag model (ARDL). By using the bound testing approach, the long run relationship between variables has been investigated. Both models have been applied to determine whether the relationship between variables is linear or nonlinear. An asymmetric relationship between labor productivity and government educational expenditure was determined. For this reason, nonlinear model is preferred. The empirical findings indicate that positive changes in educational expenditure has negative effect on labor productivity and negative changes in educational expenditure has positive effect on labor productivity. The long run coefficient of openness is significantly positive; the short run coefficient of it is significantly negative for all lags. On the other hand, the effect of GDP growth on the labor productivity is significantly positive in both short and long run. While the effect of average annual labor worked hours is significantly negative for the first two lags, it is significantly positive the last two lags in short run, it is positive but not significant in long run.
AtıfScopus3WoS2OpenAlex3İncele - MakaleAçık Erişim2018Scopus SJRQ3Genome sequences of five Lactobacillus sp. isolates from traditional Turkish sourdough
Dertli, Enes; Skory, Christopher D.; Şimşek, Ömer
A high level of variation in microflora can be observed in profiles of lactic acid bacteria (LAB) from sourdoughs. Here, we present draft genome sequences of Lactobacillus reuteri E81, L. reuteri LR5A, L. rhamnosus LR2, L. plantarum PFC-311, and the novel Lactobacillus sp. strain PFC-70, isolated from traditional Turkish backslopped wheat sourdoughs.
AtıfScopus8WoS8OpenAlex9İncele - MakaleAçık Erişim2018Investigation of the visuals associated with the national identity in Turkish republic revolution history and kemalism textbooks
Elban, Mehmet
In this research, images related to national identity were examined in history textbooks. In the first stage, nationalism, the historical course of the Turkish national identity and related literature were examined, and some components of national identity were determined. Various categories related to national identity have been formed from the elements obtained. The data about the categories were collected through document analysis. In the second phase, 8 history textbooks taught in the years 1930-2014 were selected as samples. Content analysis was used in the examination of the mentioned textbooks, and quantitative method was chosen in data analysis. In this context, data obtained by document analysis were analyzed with SPSS 13 statistical program. Chi-square tests, Bonferroni corrections for chi-square tests and graphs were used in the analyzes. The significance level for all analyzes was taken as .05. In the research, it was determined that republic values and revolutions, national struggle and the images related to the founder leader Mustafa Kemal Atatürk be a most used in Turkish Republic Revolution History and Kemalism textbooks concerning national identity. In addition, it has been found that the images of national symbols such as homeland maps, flag, parliament, and capital are used too much for the national identity.
AtıfScopus4OpenAlex2İncele