Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Dertli, Enes(114)
- Kaya, Yunus(48)
- Şahin, Engin(48)
- İspirli, Hümeyra(47)
- Özen, Soner(38)
- Şenay, Volkan(37)
- Pat, Suat(36)
- Kutlu, Naciye(32)
- Artar, Musa(31)
- Can, Zehra(31)
- Korkmaz, Şadan(31)
- Yilmaz, Mustafa Tahsin(31)
- Öner, Erdal(31)
- Bayram, Sinan(30)
- Cuce, Erdem(30)
- Ertugrul, Mehmet(29)
- Hasar, Ugur Cem(29)
- Ecem Bayram, Nesrin(28)
- Mercan, Emin(28)
- Ayata, Ümit(27)
- Bayraktar, Bülent(27)
- Çolak, Murat(23)
- Özdemir, Akın(23)
- Ayazoglu, Rabil(22)
- Cuce, Pinar Mert(22)
- Sert, Durmuş(22)
- Bayram, Ozkan(21)
- Kamiloğlu, Aybike(21)
- Dirican, Ebubekir(20)
- Kadakal, Mahir(20)
- Abdioglu, Murat(19)
- Birinci, Ahmet(19)
- Tozlu, Alperen(19)
- Gerçek, Yusuf Can(18)
- Taylan, Osman(18)
- Cinar, Mehmet(17)
- Gul, Volkan(16)
- Hasar, Ugur C.(16)
- Kadakal, Huriye(16)
- Kara, Yakup(16)
Yayınlar
- MakaleYalnız künye2017Scopus SJRQ3EFFECTS OF AMBIENT CONDITIONS ON PERFORMANCE OF GAS TURBINE COGENERATION CYCLES
Karaali, Rabi; Öztürk, Ilhan Tekin
In this paper, effects of the ambient conditions on performance of cogeneration cycles are analyzed by Using exergy analysis method. These cogeneration cycles are the simple cycle, the air preheating cycle, the air-fuel preheating cycle and the inlet air cooling cycle. Also; these cycles are evaluated thermodynamically for different air and fuel mass ratio and the performance of these cycles are compared. The electrical power generation increases about 10-15 % by decreasing the inlet air temperature of the compressor from 25 degrees C to 0 degrees C. However, the thermal power decreases about 10 % with decreasing inlet air temperature. During the summer, the electric power can be easilyincreased 2-7 % by injecting water into the inlet air of the compressor. The exergetic efficiency of cycles is decreased 11-13 %; by decreasing the compressor inlet air pressure from 101.3 kPa to 70.18 kPa. But this change decreases the electric power generation about 25 %. The highest exergy efficiency is obtained for the air-fuel preheated cycle. The simple cycle is the best among the four cycles to obtain high heat rate and heat exergy. The effects of all ambient conditions on these cycles are considered simultaneously, analyzed and compared With each other in this study.
AtıfWoS3
İncele - MakaleYalnız künye2017Mechanical Properties of Conventional Concrete Produced With Different Type of Aggregates in Bayburt Region
Tekin, Ilker; Kotan, Turkay; Yurdakul, Muhammet; Öner, Erdal
In this study, the limestone, natural aggregate, serpentine and Bayburt stone located in the province of Bayburt used as aggregate in conventional concrete production. In the experiments, the cement dosage and workability were kept constant. Slump, Ve-Be, unit weight and the highest temperature values in first 2 hours of the fresh concrete were measured. The concrete samples prepared with Bayburt stone were cured for 90 days and the others were cured for 28 days in lime-saturated water. Strain-stress data and water absorption values were measured on the hardened concretes at 7 and 28th days age through the records of stress and strain data during compressive strength tests. According to results of this study, the compressive strengths of the concrete samples with limestone, natural aggregate and serpentine were on average of 40, 35 and 5 MPa, respectively, on the 28th day. Also, in concrete samples with Bayburt stone, the compressive strengths were reached to 16 MPa for 28 days and to 22 MPa for 90 days.
AtıfWoS4OpenAlex3İncele - MakaleAçık Erişim2017Searching Cursive Handwriting Process as a Part of Skills and Sights: Example of the First Grade Teachers
Sarikaya, Ismail; Yilar, Omer
The aim of this study is to analyze the processes of cursive handwriting of the teachers who perform the cursive handwriting teaching activity and their views about this process by the scope of the special content knowledge. In the study, the method of the case study by the interactive design of the qualitative approach was utilized. The study was conducted with 6 first grade teachers who work in 6 different primary schools in Bayburt City. Two of these schools are located in villages within the city center of Bayburt. The results of the study yield that most of the teachers participated in the study did not like their cursive handwriting and did not essentially follow the rules while writing, changed spectrograms, and did not give the required importance. Moreover, some other findings were obtained that, teachers' writing abilities were insufficient and fast writing negatively affected the handwriting. Teachers notably emphasized that they find cursive handwriting very exhausting and current spectrogram rules were not in line with cursive handwriting.
AtıfOpenAlex4İncele - MakaleYalnız künye2017Scopus SJRQ1Active Earth Thrust Theory for Horizontal Granular Backfill on a Cantilever Wall with a Short Heel
Kamiloglu, Hakan Alper; Sadoglu, Erol
Cantilever retaining walls are earth-retaining structures commonly used in construction. Conventional methods used to determine the active earth thrust acting on a wall often neglect friction between the soil and wall. This study presents an analytical solution for determining the active earth thrusts acting on a cantilever retaining wall with a short heel and a shear key that supports granular backfill. Three different earth thrusts were considered to be acting on three different parts of the rear face of the wall; the thrusts were derived using the limit equilibrium method. The active earth thrust formulas were also simplified in terms of earth thrust coefficients, unit weight, and wall height. An algorithm was developed to obtain earth thrust coefficients depending on various wall dimensions and internal friction angles and to prepare graphs representing earth thrust coefficients and failure surface angles. The effects of wall dimensions and internal friction angles on the earth thrusts and failure surface angles were determined. Finally, the proposed method of determining earth thrust coefficients was compared with other approaches.
AtıfWoS21OpenAlex20İncele - MakaleAçık Erişim2017Scopus SJRQ2Microalgae production and biofuel from microalgae
Elcik, Harun; Çakmakci, Mehmet
Fossil fuel reserves which supplying a major portion of energy needs, are depleting rapidly, and its environmental damages increases day by day. Therefore, like all developed and developing countries, our country have focused on the use of renewable energy sources. Within this scope in the our country, it was aimed gain of renewable energy sources to economy, promotion of sustainable energy production, and protection of environmental. Recently, one of the growing importance of renewable energy sources is the biomass energy. As an biomass energy source, all vegetable and animal organic substances which the main components are comprising carbohydrate compounds can be used. In these energy sources, microalgae seem promising for biofuel production due to their many advantages such as they have high photosynthetic efficiency, high biomass production, and they grow quickly. From microalgae, by using biochemical methods electricity, ethanol, hydrogen, methane and biodiesel and thermochemical methods syngas, biochar, biodiesel and electricity can be produced. In this review article, isolation of microalgae, microalgal biomass production, the methods used to biomass harvesting, and the availability of microalgae as a source of raw materials for renewable biofuels were viewed.
AtıfWoS13OpenAlex11İncele - MakaleYalnız künye2017Optimization of Pectin Extraction from Orange Pulp and Characterization of Compositional and Steady Shear Properties
Yilmaz, Mustafa Tahsin; Muslu, Asli; Karasu, Salih; Bozkurt, Fatih; Dertli, Enes
Pectin, which is one of the most important wastes of fruit juice industry, was extracted from orange pulp at optimum conditions (pH, time and temperature) and modified using pectinase. The effect of modification on the structural properties of pectin was monitored using Fourier transformed infrared spectroscopy (FTIR) and high performance liquid chromatography (HPLC) analyses. The bands at 1600-1800 cm(-1) which indicate the specific region and quality of pectin were detected using FTIR while galacturonic acid content was determined using HPLC. The results showed that the galacturonic acid content of pectin from orange pulp was determined to be 406.44 mg/g powder pectin while that of the modified pectin from the orange pulp was determined to be 465,34 mg/g powder pectin. In addition, flow properties of the pectin samples were determined using rheological analysis. The viscosity and viscoelastic properties of the modified pectin samples were revealed to be different from those of non-modified pectin samples. The consistency index values of unmodified and modified pectin samples were determined to be 0.0559 Pa.s(n) and 0.0046 Pa.s(n), respectively.
AtıfWoS3İncele - MakaleAçık Erişim2017The Possibilities of Using Some Spice Essential Oils in Ice Cream Production
Macit, Emine; Çaglar, Abdullah; Bakirci, Ihsan
In present study, some physical, chemical, sensory and microbiological characteristics of ice cream samples produced by using 4 different essential oils (Coconut, lemon bark, clove and cinnamon) in 2 different levels (0.2% and 0.4%) were investigated. The findings indicated that although the addition of essential oil was not significantly effective on the physical and chemical properties of ice cream samples (P>0.05), the melting rates increased during storage. The sample with 0.2% coconut essential oil was the most favorite sample in sensory evaluations, while the sample with 0.4% clove essential oil was the least favorite sample. In general, samples with 0.2% essential oil were more appreciated than samples with 0.4%. It has been determined that ice cream samples conformed to TS 4265 Ice Cream Standard (Turkish Standard) in terms of microbiological properties. With this study, it was determined that some essential oils can be used as a natural aroma substance in the production of ice cream.
AtıfWoS6OpenAlex5TR Dizin3
İncele - MakaleYalnız künye2017The effect of extreme sports on oxidative stress
Aggon, Eser; Agirbas, Ozturk; Ucan, Izzet; Hackney, Anthony C.
Background & Study Aim: Despite the high risk of extreme sports, participation rates have increased in the last years. Rafting and paragliding are two of the most popular extreme sports. The aim of this study was the effect of rafting and paragliding exercises in males on oxidative stress situation and antioxidant status. Material & Methods: Seventeen male rafters and ten male paragliders voluntarily participated in the study. The inclusion criteria were: non-smoker, no known history of cardiovascular disease, body mass index (BMI) < 30 kg/m2, and no intake of medications or antioxidant supplements. Blood samples were taken at rafting and paragliding practices' a day before and after the sporting activities. The data were statistically analysed with Wilcoxon and Mann-Whitney U tests. Results: Rafting activity increased the values of the total antioxidant situation (TAS), paragliding exercises decreased the level of TAS while paragliding increased the level of total oxidative stress (TOS). Differences existed between the group only before activities in TAS values. Conclusions: The specific property of the rafting workout is to stimulate of participants to cope with oxidative stress by activating the antioxidant status. In turn paragliding exercises increase oxidative stress due to the danger element in the sport and perhaps requiring the participants stay at a high altitude, in some situations, during its practice.
AtıfWoS1İncele - MakaleAçık Erişim2017Scopus SJRQ3Enhanced Pinning Properties of Laser-Irradiated Bulk MgB2 Superconductors
Erdem, O.; Yanmaz, E.
In order to investigate the effect of laser irradiation on the superconducting properties of MgB2, a pellet-shaped sample was produced and cut into two pieces. The dot-shaped molten patterns, with the distance of 100 µm between them, were formed on the surface of one of the pieces by using an Nd:YVO4 laser. The grains of the irradiated sample were significantly grown due to the laser-induced sintering. The modified surface appeared to have dense and compacted grains as a result of increasing interconnectivity among the superconducting grains. The critical current densities at 5 K in a field of 3 T were found to be 5.38 × 104 and 8.96 × 104 A cm−2 for the reference and the irradiated samples, respectively. The increment of critical current density for the irradiated sample is presumably connected with the changing of pinning mechanism after the laser irradiation. For the irradiated sample which showed a higher value of critical current density at 5 K under high fields, Δκ pinning was obtained as a dominant pinning mechanism, while the normal point pinning was dominant for the reference one. These results point out that the superconducting properties of bulk MgB2 can be changed and improved via laser irradiation in a short time.
AtıfScopus12WoS10OpenAlex11
İncele - MakaleAçık Erişim2017Scopus SJRQ3Comparison of wintering ability and colony performances of different honeybee (Apis mellifera L.) genotypes in eastern Anatolian/turkey conditions; [Doğu anadolu-Türkiye koşullarinda farklı bal arısı (Apis mellifera L.) genotiplerinin kışlama yeteneği ve koloni performanslarinin karşılaştırılması]
Cengiz, Mahir Murat; Erdoğan, Yaşar
In this study, wintering ability and some physiological properties of Buckfast, Carniolan, Caucasian and Erzurum honeybee genotypes were investigated in Eastern Anatolian conditions. During the wintering season of 2014, a total of 48 colonies, 12 from each of Buckfast, Carniolan, Caucasian and Erzurum honey bee genotypes, were taken from the equilibrated colonies of Langstroth type wooden hives for wintering. In the 2015 production period, a total of 43 colonies,11 from each of Buckfast, Carniolan, Erzurum genotypes and 10 from Caucasian genotype were used in the study. In the production season, the average number of combs covered with bees in genotype groups were found as 11.72±0.63, 12.17±0.62, 9.52±0.51 and 10.72±0.55 per colony, and the average brood areas were found as 2713.7±237.9, 2797.6±238.3, 2036.5±166.4, 2364.3±197.2 cm2/colony (19.04.2015-4.10.2015). The difference between the groups was found statistically significant (P<0.01) in terms of number of combs covered with bees and brood areas. Averarage honey yields were determined as 28.08±2.37, 29.94±2.17, 19.28±2.13 and 23.36±2.15 kg/colony, respectively. The difference between groups in honey yield was found statistically significant (P<0.05).
AtıfScopus9WoS5OpenAlex8İncele - MakaleYalnız künye2017Scopus SJRQ1Microbial diversity of traditional kefir grains and their role on kefir aroma
Dertli, Enes; Çon, Ahmet Hilmi
Kefir grains consist of rich bacterial and fungal microflora responsible for the production of this traditional fermented milk beverage with unique flavour properties. Here, a pyrosequencing approach was applied for the identification of microbial flora of four kefir grains collected from different regions of Turkey and the volatile compounds in kefir samples produced with these grains were determined. Lactobacillus kefiranofaciens presented in all grains at important levels and Enterobacter, Acinetobacter, Enterococcus and Pseudomonas spp. were observed in traditional kefir grains. The fungal microflora of kefir grains was dominated by yeast species and Dipodascaceae family was dominant and Saccharomyces cerevisiae presented in all grains. Other yeast species belonging to Kazachstania, Candida, Issatchenkia and Rhodotorula species were also detected in kefir grains. Volatile compounds of kefir samples were also diverse related to the microbial diversity of kefir grains. This study revealed the rich microflora of Turkish kefir grains and their interactions with the aromatic properties of kefir.
AtıfScopus143WoS130OpenAlex174İncele - MakaleYalnız künye2017Scopus SJRQ3Performance analyses of gas turbine cogeneration plants
Karaali, Rabi; Oztürk, Ilhan Tekin
In this study, some improving methods of gas turbine cogeneration cycles are applied on a simple cogeneration cycle. These methods are preheating air, preheating air and fuel, inlet air cooling by using evaporative cooling and absorption cooling. These cogeneration systems are evaluated with respect to energy efficiency (energy utilization factor), exergetic efficiency, electric and heat power, electric-heat energy rate, artificial thermal efficiency and fuel energy saving ratio and are compared with each other. In these analyses, the thermodynamic parameters such as compressing ratio, air and fuel mass ratio and compressor inlet temperatures of the cycles are used. It is concluded that these parameters can be listed from most effective to least effective as air fuel ratio, pressure ratio and compressor inlet temperature. It is also concluded that the most efficient cycle is found to be the air-fuel preheated cycle for obtaining more electric power and less heat power, and the simple cycle is the most suitable one for obtaining more heat power and less electric power.
AtıfScopus6İncele - MakaleAçık Erişim2017Scopus SJRQ3Possibility-induced simplified neutrosophic aggregation operators and their application to multi-criteria group decision-making
Şahin, Rıdvan; Liu, Peide
Simplified neutrosophic set (SNS) is an appropriate tool used to express the incompleteness, indeterminacy and uncertainty of the evaluation objects in decision-making process. In this study, we define the concept of possibility SNS including two types of information such as the neutrosophic performance provided from the evaluation objects and its possibility degree using a value ranging from zero to one. Then by extending the existing neutrosophic information, aggregation models for SNSs that cannot be used effectively to fusion the two different information described above, we propose two novel neutrosophic aggregation operators considering possibility, which are named as a possibility-induced simplified neutrosophic weighted arithmetic averaging operator and possibility-induced simplified neutrosophic weighted geometric averaging operator, and discuss their properties. Moreover, we develop a useful method based on the proposed aggregation operators for solving a multi-criteria group decision-making problem with the possibility simplified neutrosophic information, in which the weights of decision-makers and decision criteria are calculated based on entropy measure. Finally, a practical example is utilised to show the practicality and effectiveness of the proposed method.
AtıfScopus32WoS28OpenAlex33İncele - MakaleAçık Erişim2017Scopus SJRQ2Functional and Film-forming Properties of Mechanically Deboned Chicken Meat Proteins
Saricaoglu, Furkan Turker; Turhan, Sadettin
In the present study, the functional properties of mechanically deboned chicken meat proteins (MDCM-Ps) were determined at different pH (2, 4, 6, 8 and 12), and film-forming properties were evaluated depending on MDCM-P (2, 3 and 4%) and glycerol (30, 40 and 50%) concentrations. The highest solubility, emulsifying and foaming properties were determined at pH 12. MDCM-P solutions showed non-polyelectrolyte behavior and gelation onset temperature was determined at 36°C. Film-forming properties of MDCM-P showed that the tensile strength decreased, and elongation at break increased as glycerol concentration increased. Films became more transparent with increasing glycerol and decreasing protein concentration, while water vapor permeability increased with increasing glycerol and protein concentration. Water sorption data of films were fitted to the Guggenheim, Anderson, and De Boer model. In general, equilibrium moisture content of films increased as glycerol level increased. Overall, the results showed that MDCM-P could be useful as a new protein source for both food and packaging industries.
AtıfScopus7WoS6OpenAlex9İncele - MakaleAçık Erişim2017Scopus SJRQ2Effect of different levels of pine honey addition on physicochemical, microbiological and sensory properties of set-type yoghurt
Mercan, Emİn; Akın, Nİhat
In this study, the effects of different levels of pine honey addition (3%, 5% and 7% w/v) to the yoghurt milk on starter bacteria, physicochemical and sensory characteristics of set-type yoghurts during the storage were investigated. Antioxidant activity and total phenolic content of yoghurts with added honey increased compared to control yoghurt. There was a significant increase in water-holding capacity (WHC), viscosity, total solids, redness (a*) and yellowness (b*) values of the yoghurt samples with the addition of honey at higher concentrations, whereas water activity (aw), pH and luminosity (L*) values decreased. Viscosity and WHC of the yoghurts increased during the storage.
AtıfScopus17WoS16OpenAlex17İncele - MakaleAçık Erişim2017Scopus SJRQ2L-shell differential cross-section and alignment of uranium at 59.54-keV photon energy
Akkuş, Tuba; Alım, Bünyamin; Yılmaz, Demet; Şahin, Yusuf
L X-ray differential cross-sections of uranium were calculated at several polar scattering angles (85°, 95°, 105°, 115°, 125°, and 135°) at 59.54-keV photon energy by using a Si(Li) detector. We observed that Ll and Lα X-rays were dependent on the polar scattering angle, whereas Lβ and Lγ X-rays were independent of the polar scattering angle. Therefore, the anisotropy parameters for Ll and Lα X-rays were obtained using the intensity ratios of Ll to Lγ X-rays and of Lα to Lγ X-rays to reduce some systematic errors.
AtıfScopus2WoS2OpenAlex2
İncele - MakaleAçık Erişim2017Scopus SJRQ2A new species of Hoplopholcus Kulczyński, 1908 (Araneae: Pholcidae) from the European part of Turkey
Demircan, Nurcan; Topçu, Aydın
A new species of Hoplopholcus Kulczyński, 1908 is described from caves in Tekirdağ and Kırklareli provinces of Turkey on the basis of both sexes. A morphological description and diagnosis are presented together with figures of the habitus and copulatory organs. http://www.zoobank.org/urn:lsid:zoobank.org:pub:12383325-FFC5-428C-8F3B-74D79C7ABB4E
AtıfScopus2WoS2OpenAlex1İncele - MakaleAçık Erişim2017Scopus SJRQ3Effects of origanum syriacum essential oil on blood parameters of broilers reared at high ambient heat
Tekce, E.; Gül, M.
The biochemical and hematological blood values of broilers fed under heat stress and that were administered Origanum syriacum (OS) essential oil were investigated in this study. In total, 400 male broilers (Ross-308; age, 1 day) were used for the period of 42-days of the study. The experiment included ten groups (n = 50/group; each group divided into five sub-groups): normal heat, 22°C: basal feed (BF)-positive control group (PC), BF + 100 ppm OS; BF + 300 ppm OS; BF + 600 ppm OS). Heat stress, 36°C: BF-positive control group (PC), BF + 100 ppm SOS; BF + 300 ppm OS; and BF + 600 ppm OS). Biochemical and hematological parameters were measured in blood collected into EDTA tubes. Total bilirubin, cholesterol, low-density cholesterol, Na+, Ca2+, and Mg2+ increased, whereas alanine aminotransferase, aspartate aminotransferase, creatine kinase (CK), CK-MB, urea, uric acid, Cl–, and K+ decreased (p<0.05); however, no changes were detected in the other hematological values.
AtıfScopus18WoS17OpenAlex17İncele - MakaleAçık Erişim2017Scopus SJRQ2Chinese postman problem approach for a large-scale conventional rail network in Turkey; [Primjena pristupa "problem kineskog poštara" na široku mrežu Turske željeznice]
Yılmaz, Mustafa; Çodur, Merve Kayacı; Yılmaz, Hamid
Every year, railways are inspected periodically to examine the status of rail tracks and ensure the safety of train operations of the railroad networks in Turkey. These inspection projects must be performed by several specialized machines with large and expensive equipment. Finding the optimum route of inspection machines that control through travelling all lines is critically important in terms of cost and distance. In current practice, determining the route of these machines is largerly manual and primarily relies on the knowledge and judgment of experts. This paper proposes Chinese Postman Problem (CPP) to solve the inspection machine routing problem. The objective is to minimize the total travel distance on the railroads by finding the shortest route. The proposed model is applied to a large-scale real world problem. Compared to the current practice the proposed approach significantly outperforms the reduced objective value by 20, 76%.
AtıfScopus6WoS5OpenAlex10İncele - MakaleYalnız künye2017Scopus SJRQ1Antimicrobial and functional properties of lactic acid bacteria isolated from sourdoughs
Demirbaş, Fatmanur; İspirli, Hümeyra; Kurnaz, Asena Ayşe; Yilmaz, Mustafa Tahsin; Dertli, Enes
The technological and functional properties of 15 LAB species previously isolated from sourdough were determined in terms of antifungal and antibacterial activities, production of GABA as a functional component and phytase activity. All sourdough isolates were capable of producing GABA and Weissella paramesenteroides N-7 and Lactobacillus paralimentarius E-106 showed the highest and the lowest production levels as 18,43 mM and 3,39 mM, respectively determined by HPLC analysis. The antifungal activity of these strains were tested against Aspergillus niger and Penicillium chrysogenum and two strains Lactobacillus paraplantarum N-15 and L. paralimentarius E-106 showed significant inhibitory effects to these mould species. Generally, different levels of antibacterial activity of these species were observed against food-borne pathogens but only one strain showed low levels of inhibitory effect to Salmonella typhimurium but not the other strains. The PCR detection of several bacteriocin coding genes revealed that all strains were harboured at least one bacteriocin gene among the tested genes. Finally, all strains showed phytase activity but these activity was dependant on strain specific conditions. This study revealed some important techno-functional properties of sourdough LAB strains which can play crucial roles on sourdough technology.
AtıfScopus73WoS60OpenAlex68İncele