Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Kaygusuz, Abdullah(35)
- Sipahi, Ferkan(35)
- Karsli, Orhan(34)
- Dokuz, Abdurrahman(30)
- Duran, Celal(30)
- Kandemir, Raif(29)
- Ozdes, Duygu(28)
- Maden, Nafiz(27)
- Uzun, Sevda(27)
- Merdan, Mehmet(26)
- Vural, Alaaddin(26)
- Öztürk, Serkan(25)
- Araz, Onur(24)
- Kulakaç, Nurşen(24)
- Ashyralyyev, Charyyar(23)
- Yildiz, Salih(23)
- Yilmaz, Ozgur(23)
- Doğan, Kadir Caner(21)
- Arslan, Mehmet(20)
- Aydin, Faruk(20)
- Doğru, Bülent(20)
- Bayraktar, Alemdar(19)
- Kankal, Murat(19)
- Ayaydin, Hasan(18)
- Baltaci, Cemalettin(18)
- Yolcu, Halil(18)
- Cakir, Tufan(17)
- Cengiz, Ekrem(17)
- Demir, Selim(17)
- Gücer, Mehmet Ali(17)
- Akaryali, Enver(16)
- Artan, Seyfettin(16)
- Hayaloğlu, Pınar(16)
- Kaya, Afşin Ahmet(16)
- Tosunoğlu, Büşra(16)
- Uysal, Ibrahim(16)
- Kurt, Kemal(15)
- Ozturk, Samet(15)
- Reis, Hatice Catal(15)
- Aksakal, Vecihi(14)
Yayınlar
- Kitap BölümüYalnız künye2013Geophysical approach for the detection and evaluation of geothermal energy potential stimulated from geology and tectonics in Cappadocia Region (Central Turkey)
Maden, Nafiz
Geothermal energy, which is a renewable energy source, can be used to heat buildings or generate electricity and does not contribute to air pollution when used properly, and it is heat continuously produced inside the earth that generates geological phenomena on a planetary scale. Central Anatolia is a triangular region which is limited by North Anatolian Fault Zone (NAFZ) to the north, East Anatolian Fault Zone (EAFZ) to the east, Dead sea FZ and Cyprus FZ to the south. The tectonic structure of the Cappadocia region is composed of NW trending Salt Lake Fault Zone extending approximately 220 km in length, Salanda fault zone extending 140 km, and NE trending Central Anatolian Fault zone more than 700 km in length. There are 82 geothermal regions having 171 sources with low and high temperatures due to the young volcanism and tectonic activities in this region. These geothermal regions caused by fault and fracture zones extending to the mantle parallel to the tectonic zones of the region and are situated on the areas having low Curie, high heat flow values. The Curie point depth, heat flow and geothermal gradient values determined from geophysical data of the region are correlated with tectonics and geothermal potential of the region. While the minimum crustal thickness is 38 km, the maximum crustal thickness is 41 km in Mt. Hasan and Mt. Erciyes. The Curie point depth value is computed as 13.7 km determined from magnetic anomaly data of the region. The geothermal gradient and heat flow values are estimated to be 42.3 °Ckm-1, 88.8 mWm-2, respectively. Geothermal systems and reservoir temperature of geothermal sources should be understood clearly to provide sustainability of the project with respect to the economical conditions. Various geothermometers methods have been used to determine the reservoir temperature in order to estimate the field of usage of the thermal water before the drilling stage because of the high price of the borehole. Silica geothermometers method applied to the SiO2 content of the sources gives the best information about the reservoir temperature. The maximum temperatures and depth to reservoir of the geothermal sources located in the Kayseri region are estimated as 131.8 °C, 1.14 km, respectively, in Kayseri region. It is concluded from these values that the Cappadocia region has very high geothermal potential caused by tectonic activities after the Late Triassic and partial melting of the lower crust.
- MakaleYalnız künye2013Scopus SJRQ2A statistical assessment of current seismic quiescence along the North Anatolian fault zone: Earthquake precursors
Öztürk, Serkan
The variations of the current seismicity rate on the North Anatolian Fault Zone in the beginning of 2009 have been analyzed based on the phenomenon of precursory seismic sequence before crustal main shocks. For this purpose, a statistical assessment is made to detect the seismic quiescence situation by using the standard normal deviate Z-value. Eight seismic quiescence regions are observed and quiescence anomalies in these regions have been observed since the beginning of 2005. On the Marmara part of the North Anatolian Fault Zone, four quiescence areas have been found on Silivri, in the Black Sea, around Izmit region and Çanakkale, Saros Gulf. On the Anatolian part of the North Anatolian Fault Zone, two quiescence areas have been observed on the Düzce fault and around the city of Amasya. Other anomalies have been observed around Erzincan, Elaziǧ and Bingöl regions on the eastern part of the North Anatolian Fault Zone. Due to the occurrences of the last strong earthquakes "MW = 6.0-Elaziǧ earthquake, 2010 March 08; MW = 5.2 - Çanakkale (Saros Gulf) earthquake, 2010 November 03; MW = 5.5-Erzincan earthquake, 2011 September 22 and MW = 5.1-Marmara Ereǧlisi (Tekirdaǧ) earthquake, 2012 June 07", other seismic quiescence regions may contribute to the forecasting of impending main shocks. Spatial and temporal estimates of the future seismic hazard of the North Anatolian Fault Zone are provided based on the results.
AtıfScopus14WoS10
İncele - MakaleYalnız künye2013Scopus SJRQ3Application of carrier element free coprecipitation (CEFC) method for determination of Co(II), Cu(II) and Ni(II) ions in food and water samples
Serencam, Huseyin; Duran, Celal; Ozdes, Duygu; Bektas, Hakan
A simple and highly sensitive separation and preconcentration procedure, which has minimal impact on the environment, has been developed. The procedure is based on the carrier element free coprecipitation (CEFC) of Co(II), Cu(II), and Ni(II) ions by using 2-{4-[2-(1H-indol-3-yl)ethyl]-3-(4-methylbenzyl)-5-oxo- 4,5-dihydro-1H-1,2,4-triazol- 1-yl}-N'-(pyridin-2-yl methylidene)acetohydrazide (IMOTPA), as an organic coprecipitant. The levels of analyte ions were determined by flame atomic absorption spectrometry (FAAS). The detection limits for Co(II), Cu(II) and Ni(II) ions were found to be 0.40, 0.16 and 0.17 μg L-1, respectively, and the relative standard deviations for the analyte ions were lower than 3.0%. Spike tests and certified reference material analyses were performed to validate the method. The method was successfully applied for the determination of Co(II), Cu(II) and Ni(II) ions levels in sea and stream water as liquid samples and red pepper, black pepper, and peppermint as solid samples.
AtıfScopus10WoS10
İncele - MakaleYalnız künye2013Scopus SJRQ2A multistage variational iteration method for solution of delay differential equations
Gökdoǧan, Ahmet; Merdan, Mehmet; Ertürk, Vedat Suat
In this paper, the approximate solution of delay differential equations is obtained by a reliable algorithm based on an adaptation of the classical variational iteration method (VIM), which is called the multi-stage variational iteration method (MSVIM). Examples are carried out and numerical results with comparison to exact solutions, VIM and MATLAB dde23 solver are given. The comparison reveals that the MSVIM is a promising tool to solve delay differential equations.
AtıfScopus3WoS2OpenAlex4İncele - MakaleYalnız künye2013Scopus SJRQ1The effect of the spew fillet on an adhesively bonded single-lap joint subjected to bending moment
Akpinar, Salih; Doru, Muhammet Onur; Özel, Adnan; Aydin, Murat Demir; Jahanpasand, Hamed Ghaffarzadeh
The mechanical behaviors of an adhesively bonded single lap joint with a spew fillet under bending moment, where the widths of the upper-adherend and lower-adherend are not the same, were studied experimentally and numerically. Using AA2024-T3 aluminum alloy as adherend and DP460 as paste adhesive, four different types of single-lap joint samples (without spew fillet, with spew fillet at joint edges, with spew fillet at joint ends and with spew fillet at all edges) were produced for experimental studies. Stress analyses in the single-lap joint were performed with a three dimensional non-linear finite element method by considering the geometrical non-linearity and non-linear material behaviors of both adhesives (DP460) and adherend (AA2024-T3). The single lap joint with the spew fillet with different widths had a significant effect on the stress distribution. Additionally, the spew fillet increased the load carrying capacity of the joint and decreased the stress concentration of the joint.
AtıfScopus55WoS51OpenAlex57İncele - MakaleYalnız künye2013Scopus SJRQ2Organic geochemical characteristics and depositional environments of the eocene deposits in the eastern black sea region, NE Turkey
Eker, C.S.
Type of organic material, thermal maturity, depositional environment, and source rock potential of Eocene aged clastic rocks of the Eastern Black Sea Region were investigated. Based on total organic carbon values, clastic rocks range from weak-good source rock. Samples contain a mixture of Type I-Type III kerogen. Based on T max values, Eocene aged clastic rocks were thermally mature. Moretane/hopane ratio of samples <0.15, 22S/(22S + 22R) homohopane (C32), and 20S/(20S + 20R) sterane (C29) maturity parameters were equal or very close to equilibrium value of oil generation. The deposition environment was transitional marine environment and clastic rocks do not have the potential to form hydrocarbon.
AtıfScopus5WoS5OpenAlex8İncele - MakaleYalnız künye2013Scopus SJRQ2Separation and pre-concentration of palladium(II) from environmental and industrial samples by formation of a derivative of 1,2,4-triazole complex on Amberlite XAD-2010 resin
Serencam, Huseyin; Bulut, Volkan Numan; Tufekci, Mehmet; Gundogdu, Ali; Duran, Celal; Hamza, Sibel; Soylak, Mustafa
A simple separation/pre-concentration method was developed for extraction of Pd(II) in various environmental samples, based on its adsorption of 4-phenyl-5-{[(4-phenyl-5-pyridin-4-yl-4H-1,2,4-triazole-3-yl)thio]methyl}-4H-1,2,4-triazole-3-thyol (PPTTMET) complex on Amberlite XAD-2010 resin in a mini column. The ligand has high affinity for Pd(II) among many other metals that are taken into consideration. The flame atomic absorption spectrometry is employed to determine the concentration of Pd(II). The optimum working conditions which were determined are as follows: 0.05 mol L-1 HNO3 as working medium, 1.0 mol L-1 HCI in acetone as elution solvent, 0.75 mg of PPTTMET amount and 750 mL of sample volume. The system was independent from the flow rates between 3.1 and 23.1 mL min-1. The Pd(II) adsorption capacity of Amberlite XAD-2010 resin was found to be 12.8 mg g-1 and the enrichment factor was calculated as 375. The method was successfully applied for the determination of Pd(II) in motorway dust samples, anodic sludge, gold ore, industrial electronic waste materials and various water samples.
AtıfScopus17WoS15OpenAlex17İncele - MakaleYalnız künye2013Scopus SJRQ2Biosorption properties of Morus alba L. for Cd (II) ions removal from aqueous solutions
Serencam, Huseyin; Ozdes, Duygu; Duran, Celal; Tufekci, Mehmet
The abundantly available industrial waste product Morus alba L. pomace (MAP) is one of the cost-effective biosorbent for removal of metal ions from aqueous solutions. Hence, in the present study, we aimed to test the ability of MAP to remove Cd(II) ions through batch biosorption process. Firstly, MAP was characterized using several techniques, and then the influence of various experimental parameters such as initial pH of the aqueous solution, initial Cd(II) concentration, contact time, MAP concentration, and temperature were evaluated upon the biosorption process. It was found that the maximum uptake of Cd(II) ions occurred at initial pH 6.0 and optimum contact time was observed as 60 min. Cd(II) ions adsorption on MAP analyzed by the Langmuir and Freundlich isotherm models and the maximum monolayer biosorption capacity of MAP was found to be 21.69 mg g-1 by using the Langmuir isotherm model. The pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion models were employed to describe the biosorption kinetics. In order to investigate the thermodynamic properties of the biosorption process, the changes in the Gibbs free energy (â̂†G), enthalpy (â̂†H), and entropy (â̂†S) were also evaluated and it has been concluded that the process was feasible, spontaneous, and endothermic in the temperature range of 5-40 C.
AtıfScopus38WoS36OpenAlex46İncele - MakaleYalnız künye2013Scopus SJRQ3The effect of water stress on spikelet position weight variation in wheat
Yildirim, Mustafa
This study was conducted in Eskisehir during the 2004-05 and 2005-06 growing seasons, and aimed to evaluate the response of six bread wheat varieties to rainfed and irrigated conditions in terms of grain yield, heading date, plant height and position weight variation (PWV). Of the six varieties tested, three (Sultan, Yildiz, Bezostaja) are drought-sensitive cultivars and three (Gerek, Altay, Sonmez) are drought-tolerant cultivars. Spikes from each variety were divided into five spikelet groups in order to study the effect of spikelet position upon grain weight (S1, S2, S3, S4 and S5, with S1 the spikelet closest to the base). This study focused on position weight variation (PWV) in order to better understand how 1000-kernel weight is affected by spikelet position under both rainfed and irrigated conditions and thus gains a better understanding of wheat resistance to drought. Linear increases in grain yield, heading date and plant height were observed in response to irrigated conditions, whereas a linear increase in PWV was observed in response to rainfed conditions for both seasons. Grain yield was negatively associated with heading date (r=-0.746). PWV was positively associated with grain yield and negatively associated with heading date (p<0.01; r=0.804 and r=-0.860, respectively). The observed differences in grain weight between spikelet positions have important implications for drought tolerance in wheat and can be used as a new parameter for predicting drought tolerance.
AtıfScopus2WoS2
İncele - MakaleYalnız künye2013Scopus SJRQ1Petrogenesis of the post-collisional volcanic rocks from the Borçka (Artvin) area: Implications for the evolution of the Eocene magmatism in the Eastern Pontides (NE Turkey)
Aydinçakir, Emre; Sen, Cüneyt
Whole-rock geochemistry, 40Ar-39Ar data, and Sr-Nd isotopes are presented for the Eocene Borçka volcanic rocks on the eastern corner of the eastern Pontide orogenic belt (NE Turkey). Borçka (Artvin) volcanic rocks are divided into three suites-basic dyke, Borçka basalt, and Civanköy suite. These rocks contain plagioclase (An49-88), clinopyroxene (Wo38-49En38-54Fs8-25), hornblende (Mg#=0.57-0.74) phenocrysts, and magnetite/titanomagnetite and apatite microphenocrysts. 40Ar-39Ar ages on hornblendes, ranging from 46.9±0.1 to 39.9±0.5Ma, within the middle Eocene. The volcanic rocks show tholeiitic-calc-alkaline affinities and have low-to-medium K contents. They are enriched in large ion lithophile (LILE) and light rare earth elements (LREE), with pronounced depleted high field strength elements (HFSE). The chondrite-normalized REE patterns (Lacn/Lucn=1-19) show low-to-medium enrichment, indicating similar sources for the rock suite. Initial 87Sr/86Sr values [(87Sr/86Sr)46Ma] vary between 0.70423 and 0.70495, while initial 143Nd/144Nd values [(143Nd/144Nd)46Ma] lie between 0.51263 and 0.51285. The main solidification processes involved in the evolution of the volcanics consist of fractional crystallization, with minor amounts of crustal contamination. All our evidences support the conclusion that the parental magma of the rocks probably derived from an enriched mantle, previously metasomatized by fluids derived from subducted slab, in a post-collisional, extension-related geodynamic setting.
AtıfScopus93WoS84OpenAlex88İncele - MakaleYalnız künye2013Scopus SJRQ1Post-collisional adakitic volcanism in the eastern part of the Sakarya Zone, Turkey: Evidence for slab and crustal melting
Dokuz, Abdurrahman; Uysal, Ibrahim; Siebel, Wolfgang; Turan, Mehmet; Duncan, Robert; Akçay, Miǧraç
New geochemical and isotopic data for post-collisional Early Eocene and Late Miocene adakitic rocks from the eastern part of the Sakarya Zone, Turkey, indicate that slab and lower crustal melting, respectively, played key roles in the petrogenesis of these rocks. The Early Eocene Yoncali{dotless}k dacite (54.4 Ma) exhibits high Sr/Y and La/Yb ratios, low Y and HREE concentrations, moderate Mg# (44-65), and relatively high εNd and low ISr values, similar to adakites formed by slab melting associated with subduction. Geochemical composition of the Yoncali{dotless}k dacite cannot be explained by simple crystal fractionation and/or crustal contamination of andesitic parent magma, but is consistent with the participation of different proportions of melts derived from subducted basalt and sediments. Sr/Y correlates horizontally with Rb/Y, and Pb/Nd correlates vertically with Nd isotopic composition, indicating that Sr and Pb budgets are strongly controlled by melt addition from the subducting slab, whereas positive correlations between Th/Nd and Pb/Nd, and Rb/Y and Nb/Y point to some contribution of sediment melt. In addition to low concentrations of heavy rare earth elements (~2-3 times chondrite), a systematic decrease in their concentrations and Nb/Ta ratios with increasing SiO2 contents suggests that slab partial melting occurred in the garnet stability field and that these elements were mobilized by fluid flux. These geochemical and isotopic signatures are best explained by slab breakoff and fusion shortly after the initiation of collision. Although the Late Micone Tavdaǧi{dotless} rhyolite (8.75 Ma) has some geochemical features identical to adakites, such as high Sr/Y and La/Yb ratios, low Y and HREE concentrations, other requirements, such as sodic andesite and/or dacite with relatively high MgO and Mg# (>50), relatively high Ni and Cr, low K2O/Na2O (<0.4), high Sr (>400 ppm), for slab-derived adakites are not provided. It is sodic in composition and shows no traces of fractionation from dacitic parent magma. Low Nd and high Sr isotope ratios suggest derivation by partial fusion of calc-alkaline, juvenile crust with high Sr/Y and La/Yb ratios.
AtıfScopus84WoS79OpenAlex76İncele - MakaleYalnız künye2013Scopus SJRQ3Analytical approximate solutions of fractionel convection-diffusion equation with modified Riemann-Liouville derivative by means of fractional variational iteration method
Merdan, M.
In this article, an analytical approximate solution of nonlinear fractional convection-diffusion with modified Riemann-Liouville derivative was obtained with the help of fractional variational iteration method (FVIM). A new application of fractional variational iteration method (FVIM) was extended to derive analytical solutions in the form of a series for this equation. It is indicated that the solutions obtained by the FVIM are reliable and an effective method for strongly nonlinear partial equations with modified Riemann-Liouville derivative.
AtıfScopus15WoS15İncele - MakaleYalnız künye2013Scopus SJRQ3The relationship among the current deficit - Short term capital movements and economic growth: Evidence from Turkey
Akbas, Yusuf Ekrem; Senturk, Mehmet; Sancar, Canan; Akyazi, Haydar
In this study, it was analysed if there is a short and long term relationship among the current deficit, short-term capital movements and the economic growth within the periods of 1998Q1-2011Q4 in Turkey. It was used to Autoregressive Distributed Lag model for analyzing the series. As a result of the Autoregressive Distributed Lag model test, it was confirmed the co-integration relationship among the series related to current deficit, economic growth and short term capital flows in short term and long term.
- MakaleYayıncıda açık erişim2013Scopus SJRQ3Fire analysis of reinforced concrete beams with 2-d plane stress concrete model
Zandi, Yousef; Burnaz, Oguz; Durmus, Ahmet
The main purpose of this study is to investigate the nonlinear response of reinforced concrete beams under standard fire conditions. With this purpose, the 2-D nonlinear structural analysis of a chosen reinforced concrete simple beam is carried out. This beam is exposed to fire form three sides and fixed distributed loads on top of it. In these structural analyses the changes of material properties of concrete and reinforcements according to increasing temperatures are taken into account. Results drawn from these analyses are compared with the results from some simplified methods and put forward some conclusions and recommendations concerning the fire design of reinforced concrete beams.
AtıfScopus1OpenAlex1İncele - MakaleYalnız künye2013Scopus SJRQ3Bay laurel (Laurus nobilis L.) in Japanese quails feeding. 2. Fatty acid content and oxidative stability of breast meat
Karaalp, M.; Genc, N.
In this study, the antioxidant effect of dietary supplementation with bay laurel (Laurus nobilis L.) leaves (LN) to a conventional diet on fatty acid content and oxidatif stability of breast meat was studied. For that purpose, a total number of 60 Japanese quails aged 56-d were fed diets supplemented with 0 (LN0), 2 (LN2) and 4 g (LN4) leaves/kg of feed, respectively. Quails were housed individually in cages during ten weeks. Fatty acid composition was determined for fresh breast meat. Malondialdehyde (MDA) values were determined in breast meat samples stored at +4°C (2, 5 and 8 d) and at -20°C (3 and 6 mo). Supplementation of LN had no effect on any fatty acid content of meat. However, addition of LN lowered (P<0.01) MDA content of the refrigerated meat samples only at 8 d. On the other hand, supplementation with LN had no significant effect on reducing the MDA values of meat samples during the other stored times. Besides, the amount of MDA increased (P<0.01) in all of the refrigerated and frozen meat samples with time. The results of this study demonstrated that supplementation of LN could reduce MDA content of refrigerated meat samples only at 8 d.
AtıfScopus8İncele - MakaleYalnız künye2013Scopus SJRQ2Solution of time-fractional generalized Hirota-Satsuma coupled KdV equation by generalised differential transformation method
Merdan, Mehmet; Gökdogan, Ahmet; Yildirim, Ahmet; Mohyud-Din, Syed Tauseef
Purpose - In this article, the aim is to obtain an approximate analytical solution of time-fraction generalized Hirota-Satsuma coupled KDV with the help of the two dimensional differential transformation method (DTM). Exact solutions can also be obtained from the known forms of the series solutions. Design/methodology/approach - Two dimensional differential transformation method (DTM) is used. Findings - In this paper, the fractional differential transformation method is implemented to the solution of time-fraction generalized generalized Hirota-Satsuma coupled KDV with a number of initial and boundary values has been proved. DTM can be applied to many complicated linear and strongly nonlinear partial differential equations and does not require linearization, discretization, restrictive assumptions or perturbation. The presented method is a numerical method based on the generalised Taylor series expansion which constructs an analytical solution in the form of a polynomial. Originality/value - This is an original work in which the results indicate that the method is powerful and significant for solving time-fraction generalized generalized Hirota-Satsuma coupled KDV type differential equations.
AtıfScopus19WoS16İncele - MakaleYalnız künye2013Scopus SJRQ3Effects of sister line mixtures on grain yield and some quality parameters in wheat
Yildirim, Mustafa; Cakmak, Mustafa
This study examined grain yield and grain quality (protein content, 1000 kernel weight, SDS sedimentation) of 100 wheat plant materials including 4 varieties (Gerek, Aytin, Kutluk and Kirac), 6 sister line mixtures (with each mixture consisting of 15 sister lines per diallel cross) and 90 F7 sister lines (6 crosses x 15 sister lines). In total, 100 different plant materials were used in a 10 x 10 lattice design. Plant material was sown during the 2006- 2007 growing season in two locations in Turkey (Eskisehir and Mahmudiye) with three replications per location. Analysis of variance of the combined locations found significant differences (p≤0.01) between locations and among genotypes for all 4 parameters examined. Grain yield varied significantly (p≤0.01) by block [replication] in Eskisehir and by variety in both Eskisehir and Mahmudiye. Mean grain yields at Eskisehir, Mahmudiye and the combined locations were higher for sister-line mixtures when compared to sister lines and varieties. Mean grain yields of the combined locations varied between 5125 kg ha-1 (GRK/AYT) and 2764 kg ha-1 (GRK/KRC-9). Significant differences (p≤0.05) in SDS sedimentation of plant materials were found at both Eskisehir and Mahmudiye, whereas significant differences (p≤0.05) in 1000 kernel weight and protein composition were found at Eskisehir only. In high-variety vigor, significant difference (p≤0.05) was detected for protein content at AYT/KRC (-6.8) among the sister-line mixtures in the combined locations. These results suggest that a good mixture of sister lines may result in higher grain yields. Further studies are required that look at grain yields among a greater number of sister lines.
- BildiriYalnız künye2013Three-dimensional modeling of women's talus bone
Catal, Hatice; Corumluoglu, Ozsen; Bayram, Bulent
In this study, semi-automatic region-based digital image processing techniques were used to create 3-dimensional (3D) virtual model of talus bone. 5 ballerinas and 5 sedentary women have voluntarily been involved in to the study. Total 20 right and left feet have been used which have been taken from the multidetector computed tomography (MDCT). We used 3D Doctor Software in this research. Image preprocessing, segmentation and 3D modeling steps were done respectively. Volume, area and length based various statistical ratios were computed according to the measurements. The comparisons have been accomplished by using these ratios for sedentary and ballerinas. As an outcome, some differences were found in talus of ballerina and sedentary women. We hope that the results from the biometric and reconstructive techniques carried out in this study will contribute to the present knowledge in orthopedics and digital image processing in this area.
- MakaleYalnız künye2013Scopus SJRQ1The contribution of hydropower in meeting electric energy needs: The case of Turkey
Akpinar, Adem
In this article, an attempt is made to better understand the contribution of hydropower in meeting electric energy needs of Turkey. Thus, a comparison between Turkey and other countries, which have some similarities with Turkey or which are more developed nations compared to Turkey, for evaluating from different aspects the contribution of hydropower in meeting electric energy needs is performed. The producers of electricity and hydroelectricity in the world, and the electric sectors of all the selected countries are firstly examined. Thereafter, Turkey's water resources and its potential, hydropower potential, and current status of hydropower in Turkey are investigated in detail. A detailed discussion regarding economic and energy indicators, hydroelectricity versus thermal electricity, the contributions of hydroelectricity to the total and renewable electricity generation, and the usage status of hydro potential of each selected nation is also made. Finally, it is found that hydropower is the second largest contributor in meeting Turkey's electric energy needs after thermal, mainly natural gas. It is also estimated that the contribution of hydropower will continue because a vast amount of its economically feasible hydro potential (about 64%) is undeveloped. Besides, it is determined that the contribution of hydropower in the total electricity generation in Turkey is greater than that of China and India, but it is lower than that of Norway, Brazil, and Canada.
AtıfScopus21WoS20OpenAlex27İncele - MakaleYalnız künye2013Scopus SJRQ1The effects of antifreeze use on physical and mechanical properties of concrete produced in cold weather
Çullu, Mustafa; Arslan, Metin
This study examined the effects of antifreeze on the physical and mechanical properties of the concrete which are produced in cold weather. 30% Calcium Nitrate and 5% hydroxyethylaminemixture (HEA), Calcium Nitrate (KN) and Polyhydroxy Amine (PA) were used as additives in antifreeze. Prepared concrete samples were placed in a formwork and exposed to the frost at 0 °C, -5°C, -10°C, -15°C and -20°C for 2 days. Afterwards, concrete samples in the freezer were cured at the room temperature until the 28th day and permeable pore space volume, water absorption ratio, density, capillarity ratio, impermeability, compressive strength, static modulus of elasticity, Poisson's ratio and tensile strength values of the concrete samples were determined after the curing. In conclusion, 30% Calcium Nitrate and 5% hydroxyethylaminemixture (HEA) were found to be giving the best performance among the antifreeze types. The physical and mechanical properties of the concrete were negatively affected from all antifreeze types due to the temperature decrease of the exposed fresh concrete.
AtıfScopus47WoS37OpenAlex44İncele