Sürdürülebilir Kalkınma Amaçları

Yazarlar

  • MakaleYalnız künye2019Scopus SJRQ1
    Circuit implementation of nano-scale TiO2 memristor using only metal-oxide-semiconductor transistors

    Gul, Fatih

    A metal-oxide-semiconductor (MOS)-based circuit model that emulates a TiO2 memristor is proposed in this study. First, a TiO2 (10-nm active layer thickness)-based memristor device was fabricated. The structural properties of the device were confirmed via energy dispersive X-ray spectroscopy. The memristive characteristics of the device were resolved by applying a time-dependent voltage. The typical pinched hysteresis memristive loops of the current-voltage curves were obtained. After physical implementation and characterization of the device, a circuit model was implemented using only four MOS transistors to emulate the fabricated TiO2 memristor. In addition to emulating the fabricated memristor, the proposed circuit model is suitable for use in general memristor-based applications. No active element or circuit blocks were used in the circuit to achieve memristive characteristics. The simulation and experimental results are in good agreement; moreover, the circuit is very simple compared to those presented in previous studies in the literature and it was able to emulate the fabricated memristor. All simulations were completed using 180 nm TSMC CMOS process parameters.

    AtıfScopus38WoS35OpenAlex40
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  • MakaleYalnız künye2019Scopus SJRQ2
    Effects of wood preservatives on the combustion process and combustion quality of wood

    Sadiye Yasar, S.

    This study examines the combustion properties of Scots pine (Pinus sylvestris L.) and Oriental beech (Fagus orientalis L.) in 3 stages (CWF, SC and EC) according to ASTM E 160-50 (1975). Wood samples were impregnated with Tanalith-E (T) and Wolmanit-CB (WC) and then were varnished with Synthetic (St) and water based (wb) varnishes. When the combustion was completed, the weight loss, combustion temperatures, illuminance values, total time of combustion, and demolition time were measured. As the result, illuminance value of Oriental beech wood decreased, while the smoke density increased. Scots pine was later destroyed in the combustion process. Areas with a risk of fire are advised to use pine wood instead of beech. Wolmanit-CB and synthetic varnish reduced the temperature and illuminance values. Oriental beech, Tanalith-E, and synthetic varnish resulted in the highest temperatures for all combustion stages. This triple interaction increased total combustion time values by more than 90% when compared with the control samples.

    AtıfScopus4WoS5
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  • MakaleAçık Erişim2019Scopus SJRQ2
    New desmid records from high mountain lakes in Artabel Lakes Nature Park, Gümüşhane, Turkey

    Şahin, Bülent; Akar, Bülent

    The algal flora of 17 lakes and 1 pond in the Artabel Lakes Nature Park were investigated during two summer seasons (2013 and 2016). In total, 26 desmid taxa were found and identified as new records for the desmid flora of Turkey based on their morphotaxonomic characteristics and ecological preferences. The taxa identified belong to the genera Actinotaenium (1), Closterium (1), Cosmarium (15), Micrasterias (1), Spondylosium (1), Staurastrum (5), Teilingia (1), and Tetmemorus (1). Morphotaxonomy, ecology, and distribution of each species were discussed in detail.

    AtıfScopus7WoS5OpenAlex8TR Dizin7
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  • MakaleYalnız künye2019Scopus SJRQ1
    A new use of the ant system algorithm for the max-mean dispersion problem

    Cura, Tunchan; Özdemir, Muhlis

    This study addresses an NP-hard problem known as the max-mean dispersion problem (MaxMeanDP), which belongs to a well-known class of diversity problems. In view of the increasing importance of parallel computing, this study proposes an ant system (AS) approach to the MaxMeanDP in which ants execute the search process in parallel. Moreover, by proposing a rather different use of the pheromone trail and visibility compared to the original AS, a new AS algorithm is introduced that runs in parallel. Our analysis indicates that the new use of the pheromone trail and visibility significantly contributes to the quality of the solution. The results show that the proposed method is effective, efficient and comparable to other approaches.

    AtıfScopus5WoS3OpenAlex3
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  • MakaleAçık Erişim2019Scopus SJRQ2
    Formal Assessment and Measurement of Data Utilization and Value for Mines

    Rogers, W. Pratt; Kahraman, M. Mustafa; Dessureault, Sean

    Most contemporary mines have considerable amounts of data. Structured and unstructured large data sets are colloquially named big data. Much of the data in mining operations come from a variety of systems, each with different databases and reporting environments. Standard technology deployments create a “silo-ification” of data leading to poor system benefit. Through modern server monitoring and systematic approach, data utilization and value can quantifiably be measured. The Data Utilization and Value Index (DUVI) can quantify business intelligence best practices and user interaction. This study seeks to provide a data management tool to measure data utilization across the process of converting data into action.

    AtıfScopus3WoS3OpenAlex6
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  • MakaleAçık Erişim2019Scopus SJRQ2
    Addressing the sneak-path problem in crossbar RRAM devices using memristor-based one Schottky diode-one resistor array

    Gül, Fatih

    Resistive random access memories (RRAMs) are favorable contenders in the race towards future technologies. Moreover, the desirable properties of memristor-based RRAM devices make them very good competitors in this field. The sneak paths problem poses one of the main difficulties in the construction of crossbar memory devices. This problem can be effectively suppressed by applying the 1diode-1resistor (1D1R) design structure. The Schottky diode has many advantages compared to the PN junction diode. The low-power (∼1 µW) ZnO active-layered thin-film (60 nm thick) one Schottky diode-one memristor device fabricated in this study included a top Ag electrode and a bottom Al electrode. The material makeup of the device was confirmed via energy dispersive X-ray spectroscopy (EDAX). The memristive and Schottky diode characteristics of the Ag/ZnO/Al device were resolved by measuring the time-dependent voltage/current. The characteristic pinched hysteresis memristive loops were observed at the first quadrant of the current-voltage plane, whereas the diode curves were seen at the third quadrant. Using the current-voltage curves, the height of the Schottky barrier, ideality factor and threshold voltage of the Schottky diode were found to be 0.68 eV, 3.75 and 0.49 V, respectively. After physical implementation and characterization of the one diode-one memristor device, its anti-crosstalk characteristics were investigated. Taking into account the 10% read margin, the maximum crossbar size was found to be 87.

    AtıfScopus121WoS115OpenAlex127
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  • MakaleYalnız künye2019Scopus SJRQ2
    Natural convection in an enclosure with a pair of discrete heat sources

    Saglam, Mehmet; Sarper, Bugra; Aydin, Orhan

    An experimental and numerical study is carried out to investigate natural convection cooling characteristics of discrete heat sources in a rectangular enclosure. One of the sidewalls of the enclosure is heated by a pair of identical discrete heat sources, whereas the other sidewall is maintained at a constant temperature. The effect of the heat dissipation ratio of the heat sources on buoyancy-induced flow and heat transfer characteristics is investigated. Experimental studies are performed for a constant value of the modified Rayleigh number (Ra = 7.7 × 105) and three different values of the heat dissipation ratio (rh = q1 = q2 = 0.5, 1 and 2), whereas numerical studies cover the range of 104to 5 × 106 for the modified Rayleigh number and different values of the heat dissipation ratios between 0.25 and 2. In the experimental study, qualitative flow visualization studies are carried out as well as temperature measurements. In the numerical study, a commercial computational fluid dynamics code in ANSYS Fluent is used. The variations of the surface temperatures, the hot spot temperature, and the mean Nusselt number with the modified Rayleigh number and the heat dissipation ratio are obtained. Results are presented in terms of streamlines, isotherms, and heat lines.

    AtıfScopus19WoS16OpenAlex26
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  • MakaleYalnız künye2019Scopus SJRQ4
    On some properties of hyper-bessel and related functions

    Aktaş, I.

    In this study, by using the Hadamard product representation of the hyper- Bessel function and basic concepts in mathematics we investigate the sign of the hyper- Bessel function x → J αd (x) on some sets. Also, we show that the function x → J αd (x) is a decreasing function on [0, J αd ,1), and the function is an increasing function on (0,∞), where j αd ,1 and II αd denote the first positive zero of the function J αd (x) and modified hyper-Bessel function, respectively. In addition, we prove the strictly log-concavity of the functions J αd (x) and J αd (x) on some sets. Moreover, we give some illustrative examples regarding our main results.

    AtıfScopus4WoS5TR Dizin2
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  • MakaleYalnız künye2019Scopus SJRQ3
    Radioactivity measurements in spas of central and Eastern Black Sea region, Turkey

    Duran, S.U.; Küçükömeroğlu, B.; Çevik, U.; Çelik, N.; Taskin, H.; Ersoy, H.

    Background: The aim of this study is to measure the level of radon gas in the thermal springs of the four seasons in the Black Sea Region and to determine the gamma activity levels in the soils around them. Materials and Methods: Indoor radon activity concentrations of four spa facilities, namely Ladik, Havza, Ilıcaköy, and Ayder, were measured using CR-39 passive radon dosimeters and active radon monitoring AlphaGUARD for all four seasons. Radon activity concentrations in the soil in the vicinity of these spa facilities were measured using AlphaGUARD. Radionuclides in the soil samples collected from the spa regions were also determined using gamma-ray spectroscopy. Results: The highest radon value in the air environment in the spa facility was measured in swimming pools. Indoor radon levels in the spa's swimming pool vary within a wide range, (30-2118) Bq·m−3. The average radon gas levels in the soil around the Ayder, Havza, Ladik and Ilıcaköy hot springs were measured as 38±1 kBqm-3, 9±1 kBq m-3, 50±3 kBqm-3, 955±5 kBqm-3, respectively. Conclusion: The annual effective doses due to indoor radon sources changed from 0.6 mSv to 13.4 mSv for workers, and from 1 x10 -4 mSv to 3x10-1 mSv for patients. The annual effective dose equivalents from the soils around the spa were calculated to be between 82-558 µSv y-1. The results were compared with those of other measurements performed in different parts of the world.

    AtıfScopus3WoS3
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  • MakaleAçık Erişim2019Scopus SJRQ3
    Investigation of certain nutritional properties of noodle enriched with raw flaxseed

    Yuksel, F.

    In this study, traditional homemade noodles were enriched with raw flaxseed and some nutritional properties such as resistant starch (RS), total starch, total dietary fibre (TDF), estimated glycaemic index (eGI) and major mineral composition of final products were investigated. Flaxseed was supplemented into the noodle mixture at three different concentrations (10, 15 and 20 g/100 g). RS content of the samples was in the range of 0.61-2.14 g/100 g and the highest RS was found for the sample having 10% flaxseed. Maximum TDF value was determined to be 8.28% for the noodle sample enriched with 20% of flaxseed while that of control was 1.68%. Estimated eGI of the samples was not significantly affected by the flaxseed fortification while mineral composition of noodle samples was significantly affected by the flaxseed addition (P < 0.05). The major mineral compounds present in the samples were sodium, potassium, magnesium and phosphorus. It could be concluded that the noodle enriched with 10% of flaxseed would be a healthier alternative product for consumption.

    • SDG 2 · Açlığa Son
    • SDG 3 · Sağlık ve Kaliteli Yaşam
    AtıfScopus10WoS9OpenAlex11
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  • MakaleAçık Erişim2019Scopus SJRQ3
    Optimum tuning of a gyroscopic vibration absorber for vibration control of a vertical cantilever beam with tip mass

    Ünker, F.; Çuvalcı, O.

    In this paper, a symmetric gyro with coupling to the tip mass of a beam mounted on a vibrating base is considered. Taking advantage of the angular momentum of the rotating gyroscope, gyrostabilizer systems are expected to become more widely actualized as they provide an effective means of motion control with several significant advantages for various structures. This paper mainly focused on finding optimized stiffness and damping values that minimize the vibration responses with the derivation of the frequency equations of a special combined gyro-beam system. Correctness of the analytical results is verified by numerical simulations. The comparison with the results from the derivation of the corresponding frequency equations shows that the optimized stiffness and damping values are very accurate.

    AtıfScopus8WoS5OpenAlex7
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  • MakaleYayıncıda açık erişim2019Scopus SJRQ4
    Investigating the mechanical behavior of reclaimed asphalt pavement (RAP) bases in large scale test box

    Seferoğlu, Ayşegül Güneş; Seferoğlu, Mehmet Tevfik; Akpinar, Muhammet Vefa

    The objective of this research was to assess the elastic deformations and permanent strains of reclaimed asphalt pavement (RAP) material as a base layer when it is treated or untreated with pozzolanic cement under cyclic loads. A large-scale cyclic plate loading testing (CPLT) device was developed for studying the mechanical characteristics of pavement base layer. The laboratory test results indicated that when the RAP percentage of the mixtures increased, elastic deformations and permanent strains increased, but the opposite was true when the cement percentage increased. It was concluded that 100% RAP material can be used in base layers with 3% pozzolanic cement. The obtained deformation values and strain rates can be used as reasonable default design input values by pavement designers when using RAP as a substitute for natural aggregate base layers.

    • SDG 9 · Sanayi, Yenilikçilik ve Altyapı
    • SDG 12 · Sorumlu Üretim ve Tüketim
    AtıfOpenAlex2
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  • MakaleYalnız künye2019Scopus SJRQ1
    U-Pb geochronology, bulk-rock geochemistry and petrology of Late Cretaceous syenitic plutons in the Gölköy (Ordu) area (NE Turkey): Implications for magma generation in a continental arc extension triggered by slab roll-back

    Temizel, İrfan; Arslan, Mehmet; Yücel, Cem; Yazar, Emel Abdioğlu; Kaygusuz, Abdullah; Aslan, Zafer

    Late Cretaceous felsic plutons in the Eastern Pontides orogenic belt of Turkey are found in varying ages, sizes and compositions. The Late Cretaceous syenitic bodies, namely Direkli and Yeniköy Tepe plutons in the Ordu area, intruded into the Late Cretaceous volcanics and volcanoclastics, and compositionally consist of syenite and minor quartz-syenite with mainly granular and rarely porphyric, poikilitic and perthitic textures. The studied plutons contain K-feldspar, plagioclase, quartz, clinopyroxene, biotite and minor hornblende, and Fe-Ti oxide, apatite, and zircon. Mineral thermobarometer estimations imply that the syenitic plutons were crystallized in P-T conditions representing mid to shallow crustal levels. Petrochemically, these syenitic plutons show I-type, metaluminous-peraluminous transitional (A/CNK = 0.85–1.04) and shoshonitic features. LA-ICP-MS U-Pb zircon dating on the syenitic plutons yielded weighted mean ages of 78.5–72 Ma. Primitive mantle-normalized trace element patterns of the studied plutons are characterized by negative anomalies of Ba, Sr, Nb, Ta and Ti, and enrichment in Rb, Th, K, Ce and La. The chondrite-normalized rare earth element (REE) plots of the studied plutons show moderately enriched concave-shaped patterns (La N /Lu N = 10.3–10.7 for the Direkli pluton; La N /Lu N = 6.8–11.7 for the Yeniköy Tepe pluton) with negative Eu anomalies. The plutons have 87 Sr/ 86 Sr ratios (0.705368–0.706954), 143 Nd/ 144 Nd ratios (0.512600–0.512672), 206 Pb/ 204 Pb ratios (19.29–19.52) and 207 Pb/ 204 Pb ratios (15.65–15.67). The geochemical data, as well as regional geology, suggest that the Late Cretaceous syenitic plutons have formed in an extensional continental arc setting triggered by slab roll-back. The parental magma of syenitic plutons was derived from melts of lower crustal materials (metabasalt/metaandesite) and lithospheric mantle component.

    AtıfScopus32WoS29OpenAlex32
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  • MakaleYalnız künye2019Scopus SJRQ1
    Forecasting of Turkey’s monthly electricity demand by seasonal artificial neural network

    Hamzaçebi, Coşkun; Es, Hüseyin Avni; Çakmak, Recep

    Electricity is one of the most important end-user energy types in today’s world and has an effective role in development of societies and economies. Stability of electricity supply is provided by matching of generated and consumed electricity amount during the all-day. So, electricity consumption forecasting is an essential issue for electric utilities. In this study, the monthly electricity demand of Turkey has been predicted. To model the effects of seasonality and trend, four different ANN models have been developed and selected the superior one. In addition, the selected ANN model has been compared with SARIMA model in order to increase the acceptability and reliability of the ANN model. The monthly electricity demand of Turkey has been predicted between 2015 and 2018 via the ANN model that can make successful and high-accuracy predictions according to the performance measures. The forecasting values will help in determining the medium-term and stable energy policies.

    • SDG 7 · Erişilebilir ve Temiz Enerji
    AtıfScopus66WoS51OpenAlex77
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  • MakaleYalnız künye2019Scopus SJRQ2
    A fuzzy logic embedded energy management software with multi-agent system for a stand-alone PV power plant

    Ozden, T.; Kesler, S.; Okumus, H.I.

    The worst scenario projected for an off-grid photovoltaic power system is the time interval that the solar irradiation amount is in short to supply the load throughout the day, and this situation is resulted in energy deficiency. Nowadays, an off-grid power generating system, which is designed to consider the worst scenario encountered only during a certain period of time, brings through big financial problems in terms of the initial installation costs. This study proposes a smart software to perform energy management considering users’ comfort and their criteria, which are taking some information from the agents communicating with the consumption units wirelessly and the battery agent. All loads and agents in this system are initially defined by the user according to the importance of the consumption loads such as critical, essential, significant, lesser, and insignificant loads. The proposed energy management software includes fuzzy logic-based decision maker to manage load suspension or put the suspended load into effect again according to the state of the sources. The total amount of consumption is kept less than the total existing energy so that the energy to be consumed by the critical loads is always provided. Considering the existing amount of energy and consumer preferences, the total amount of load units is maximized at each sampling step. The proposed system, which is attained without compromising the user comfort, enables more efficient energy consumption. Also, for supplying the critical loads in case of lack of energy is possible.

    • SDG 7 · Erişilebilir ve Temiz Enerji
    • SDG 9 · Sanayi, Yenilikçilik ve Altyapı
    AtıfScopus6WoS4OpenAlex8
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  • MakaleYayıncıda açık erişim2019Scopus SJRQ4
    Evaluation of soil geochemistry data of Canca Area (Gümüşhane, Turkey) by means of Inverse Distance Weighting (IDW) and Kriging methods-preliminary findings

    Vural, Alaaddin

    The purpose of this study is to assess soil geochemical data of the Canca alteration area (Gümüşhane-Turkey) using statistical methods and investigate potential gold mineralizations of the area. With this purpose, 288 soil samples were collected and analyzed for gold and associated pathfinder elements. The concentrations ranged (Au and Hg: in μg/kg, others in mg/kg) between 0,68-19,20; 0,02-28,97; 2-314; 7-857; 2,1-394; 4-199,5; 0,59-49,29; 5-89; 0,04-37; 0,52-16,30; 1,25-91,9 for Au, Ag, Cu, Pb, Zn, As, Sb, Bi, Mo, Sn and Hg respectively. According to Sperman’s rho correlation coefficients, although not very strong, correlation was observed between Cu and Au; Zn and Cu; Sb and Pb and As; Mo and Pb and As and Sb; Sn and As; Sb and Mo. The threshold values of the elements were obtained by median+2 the median absolute deviation. The prediction maps of the elements were formed by using the Inverse Distance Weighting and Kriging methods. According to prediction maps; especially in the western part of the study area and also related to tectonic lines, elemental enrichments, (gold and silver) were determined. Therefore, it is suggested to give importance to the west of the area in exploration drilling, geophysics, etc. Since the element prediction maps produced by the Inverse Distance Weighting method has higher resolution in anomaly contrast, it is suggested that maps produced with this method can preferably be used to give an idea at first sight in soil geochemistry studies.

    • SDG 15 · Karasal Yaşam
    AtıfScopus15WoS12OpenAlex5
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  • MakaleYalnız künye2019Scopus SJRQ3
    Preliminary investigation of yoghurt enriched with hazelnut milk

    Ilyasoğlu, H.; Yilmaz, F.

    The present work aimed to investigate the use of hazelnut milk (HM) with dairy milk in the preparation of yoghurt. Cow milk (CM) mixed with HM (75:25, v/v) was used as the raw material for HM-enriched yoghurt (HMEY). The control sample was prepared with CM only. The proximate composition, physicochemical and sensorial properties, and fatty acid and sterol compositions were determined. The proximate composition of the HMEY samples was found to be compatible with dairy yoghurt. The HMEY samples were rich in monounsaturated fatty acids (mainly oleic acid), whereas the control sample had a higher level of saturated fatty acids. The HMEY samples had a lower cholesterol content than the control sample. They also contained phytosterols (mainly β-sitosterol). These findings reveal that HM might have a potential in yoghurt manufacturing, and that the use of HM might enhance the health benefits of yoghurt especially in sustaining cardiovascular health.

    AtıfScopus11WoS10
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  • MakaleAçık Erişim2019
    OBJECT BASED BURNED AREA MAPPING WITH RANDOM FOREST ALGORITHM

    Comert, Resul; Matcı, Dilek Kucuk; Avdan, Ugur

    It is very important to map the burned forest areas economically, quickly and with the high accuracy of issues such as damage assessment studies, fire risk analysis, and management of forest regeneration processes. Remote sensing methods give advantages such as fast, easy-to-use and high accuracy for burned area mapping. Recent years machine learning algorithms have become more popular in satellite image classification, due to the effective solutions for the analysis of complex datasets which have a large number of variables. In this study, the success of object based random forest algorithm was investigated for burned forest area mapping. For this purpose, Object based image analysis (OBIA) was performed using Landsat 8 image of the Adrasan and Kumluca fires which occurred in 24 – 27 June 2016. The study consisted of five steps. In the first step, the multi-resolution image segmentation was performed for obtaining image objects from Landsat 8 spectral bands. In the second step, the image object metrics such as spectral index and layer values were calculated for all image objects. In the third step, a random forest classifier model was developed. Then, the developed model applied to the test site for classification of the burned area. Finally, the obtained results evaluated with confusion matrix based on the randomly sampled points. According to the results, we obtained 0.089 commission error (CE) with 0.014 omission error (OE). An overall accuracy was obtained as 0.99. The results show that this approach is very useful to be used to determine burned forest areas.

    • SDG 15 · Karasal Yaşam
    AtıfScopus49WoS47OpenAlex63TR Dizin13
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  • MakaleAçık Erişim2019Scopus SJRQ2
    The inhibition profile of sesamol against α-glycosidase and acetylcholinesterase enzymes

    Topal, Meryem

    Sesamol (1,3-benzodioxol-5-ol) is found in the oilseed product, sesame. In our study, the inhibitory effects of sesamol compound on acetylcholinesterase and α-glycosidase enzymes were evaluated. Another aim of this study was to compare the inhibitory effects of sesamol to acarbose for α-glycosidase enzyme and tacrine for acetylcholinesterase (AChE). Sesamol exhibited non-competitive inhibition for both metabolic enzymes. IC50 values for AChE and α-glycosidase enzymes were calculated as 86.63 nM and 99.00 nM, respectively. On the other hand, Ki values were calculated as 46.68 nM and 75.33 nM for AChE and α-glycosidase enzymes, respectively. According to the obtained results showed effective inhibition at low concentrations.

    • SDG 3 · Sağlık ve Kaliteli Yaşam
    AtıfScopus25WoS22OpenAlex25
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  • MakaleAçık Erişim2019Scopus SJRQ1
    Application of multi pass high pressure homogenization to improve stability, physical and bioactive properties of rosehip (Rosa canina L.) nectar

    Saricaoglu, Furkan T.; Atalar, Ilyas; Yilmaz, Volkan A.; Odabas, Halil I.; Gul, Osman

    The effect of high pressure homogenization (HPH) on physical and bioactive properties of rosehip nectar was investigated. Rosehip nectar has a sedimentation problem while waiting on the market shelf during the sale, for solving this problem, nectars were passed 1, 2 and 3 times through 75, 100 and 125 MPa pressures. Mean particle size decreased as pressure and pass number increased (p < 0.05), whereas zeta potential did not change (p > 0.05). Microstructural images revealed that HPH treatment disrupted the cells and caused to release of cell materials to serum. HPH treatment increased the ΔE values (from 2.48 to 6.03). HPH treated samples showed no sedimentation during storage for 15 days. All samples showed shear thinning behavior and were characterized as weak gel network (G′ > G″). Total phenolic content and ascorbic acid results were decreased by HPH treatments due to increasing outlet temperatures of product, however, antioxidant capacity of nectars increased after treatment due to increasing total carotenoid content. This study indicated that HPH treatment could solve the sedimentation problem during shelf life with minimally affecting bioactive and physical properties of rosehip nectar.

    • SDG 2 · Açlığa Son
    AtıfScopus49WoS39OpenAlex54
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