Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Uzun, Sevda(62)
- Merdan, Mehmet(58)
- Duran, Celal(50)
- Ozdes, Duygu(47)
- Kaygusuz, Abdullah(43)
- Ashyralyyev, Charyyar(38)
- Karsli, Orhan(33)
- Öztürk, Serkan(32)
- Araz, Onur(31)
- Demir, Selim(29)
- Kulakaç, Nurşen(29)
- Dokuz, Abdurrahman(28)
- Arslan, Mehmet(27)
- Baltacı, Cemalettin(27)
- Maden, Nafiz(27)
- Sipahi, Ferkan(27)
- Topal, Fevzi(27)
- Turan, Ibrahim(27)
- Kandemir, Raif(25)
- Kurt, Kemal(24)
- Ozturk, Samet(24)
- Peker, Iskender(24)
- Vural, Alaaddin(24)
- Reis, Hatice Catal(23)
- Yücel, Cem(23)
- Aydin, Faruk(22)
- Baltaci, Cemalettin(22)
- Gücer, Mehmet Ali(22)
- Günen, Mehmet Akif(22)
- Kankal, Murat(22)
- Topal, Meryem(22)
- Karimullah, Suud Sarim(21)
- Uysal, Ibrahim(20)
- Kurnaz, Muammer(19)
- Tuncer, Metin(19)
- Yolcu, Halil(19)
- Çelik, Necati(19)
- Ürkek, Bayram(19)
- Şan, Murat(19)
- Aliyazicioglu, Yuksel(18)
Yayınlar
- MakaleYalnız künye2018Scopus SJRQ4Investigation of the inhibitory effects of human carbonic anhydrase i and jack bean urease by coumarin derivates
Aygul, Imdat; Karahalil, Fatma Yaylaci; Danis, Ozkan; Ogan, Ayse; Kolayli, Sevgi
Introduction: This study investigated the in vitro inhibition properties of newly synthesized coumarin derivates (C1-C5) against human carbonic anhdyrase I (hCA-I) and jack bean urease. Activities were expressed as IC50 (mg/mL), the concentration reducing 50% of the enzymes. The IC50 values for hCA-I ranged 5.20 µM from 12.10 µM, with compound C3 exhibiting the highest activity. The inhibition values for urease ranged 22.30 µM to 39.00 µM, the highest activity being observed in C5. Conclusion: Comparing the inhibitions with standard inhibitors of the enzymes, while the samples exhibited moderate inhibitions against hCA I, high inhibition was determined against urease.
AtıfScopus2OpenAlex1
İncele - BildiriYalnız künye2018Optimal scheduling of time shiftable loads in a task scheduling based demand response program by symbiotic organisms search algorithm
Cakmak, R.; Altas, I.H.
Demand side management is one of the key issues in smart electrical grid studies. Power demand of consumers can be managed via demand response(DR) programs. Task scheduling (TS) based demand response is one of the DR schemes. Objective of the TS approach is to schedule activation time of the appropriate time-shiftable loads to reduce power consumption in peak-demand hours. Heuristic optimization methods can be used to provide this objective. Symbiotic Organisms Search (SOS) and Cuckoo Search (CS) algorithms are two of the most recent heuristic methods. In this paper, scheduling of the time-shiftable home appliances executed by SOS and CS algorithms. Time-shiftable home appliances of the consumers and run time tolerances of them aggregated by mini public survey to achieve results which close to reality. Obtained results are indicated the superiority of the SOS algorithm and demonstrated the positive effects of the demand side management on the electrical grid.
AtıfScopus20WoS12OpenAlex18
İncele - BildiriYalnız künye2018On the Yearly Performance of a Bifacial PV Module in Central Anatolia - Turkey
Özden, Talat; Turan, Raşit; Aklnoǧlu, Bülent Gültekin; Zaz, Y.; Essaaidi, M.
With the tremendous increase in the photovoltaic (PV) power plants world-wide remarkable decreases in their installation prices per watt are attained mainly due to economic scale effect. This brings questioning to increase their energy yields by considering any possible way like fabricating bifacial solar modules. Present study is on the performance analysis of a bifacial PV module using one-year outdoor testing results in Ankara-Turkey. The module performed very well and reached a specific yield value of 1750 kWh/kWp. This value for Central Anatolia region is well above the values predicted (and suggested) by the local authorities. The efficiency and performance ratio variation with respect to ambient and module temperature are obtained. The calculated dependence of efficiency on the module temperature is found to be η=-0.073Tmod+18.05, and the maximum measured module temperature is about 70 °C. The results show that the bifacial modules have the potential to replace the mono facial modules that are now dominating the PV market.
AtıfScopus3OpenAlex2İncele - MakaleYalnız künye2018Scopus SJRQ1Geochemical and Sr-Nd-Pb isotope characteristics of the Miocene to Pliocene volcanic rocks from the Kandilli (Erzurum) area, Eastern Anatolia (Turkey): Implications for magma evolution in extension-related origin
Kaygusuz, Abdullah; Aslan, Zafer; Aydınçakır, Emre; Yücel, Cem; Gücer, Mehmet Ali; Şen, Cüneyt
This paper presents Sr-Nd-Pb isotopic and whole-rock geochemical data of Miocene to Pliocene volcanic rocks in the Eastern Anatolia (Turkey) aiming to unravel their sources and evolutionary history. The wide compositional range of lavas and pyroclastics includes basaltic andesite, basaltic trachyandesite, trachyandesite, andesite and trachydacite. These calc-alkaline volcanics are enriched in large ion lithophile elements and light rare earth elements and depleted in the high field strength elements. Sr-Nd isotope data indicate low values for 87Sr/86Sr(i) (0.70432–0.70464) and high values for 143Nd/144Nd(i) (0.51272–0.51282). Further, these data are within the mantle array of the isotope ratio diagram. The lead (Pb) isotopic compositions (206Pb/204Pb(i) = 18.33 to 18.62, 207Pb/204Pb(i) = 15.51 to 15.60, 208Pb/204Pb(i) = 38.10 to 38.45) reveals the presence of an enriched source. The main petrological processes involved fractional crystallization and the mixing of at least two fractionated magmas having same source characteristics. All evidence supports the findings that the Kandilli volcanic rocks were derived from a partial melting of the both spinel and garnet bearing subcontinental lithospheric mantle, which had been previously metasomatized by mostly fluids derived from subducted slab during the collisional and post-collisional extension-related geodynamic setting in the Eastern Anatolia region of Turkey.
AtıfScopus35WoS31OpenAlex35İncele - MakaleAçık Erişim2018Scopus SJRQ2Sensitivity-Based Model Updating of Building Frames using Modal Test Data
Altunişik, Ahmet Can; Karahasan, Olguhan Şevket; Genç, Ali Fuat; Okur, Fatih Yesevi; Günaydin, Murat; Adanur, Süleyman
Model updating is of significant importance in the actual analyses of real structures. The differences between experimental and numerical dynamic characteristics can be minimized by means of this procedure. This procedure can be carried out using two approaches, namely, the manual model updating and the global or local automated model updating. The local model updating is a convenient tool for all kind of structures capable of minimizing the differences mentioned previously nearly to zero and also of identifying the damage locations and monitoring structural integrity. In this way, current realistic behavior of structures can be represented by updated finite element models. This paper describes a Reinforced Concrete (RC) frame model, its ambient vibration testing, finite element modeling and sensitivity-based automated model updating. The RC frame is of ½ geometric scale with two floors and two bays in the longitudinal direction. It was built and then subjected to ambient vibration tests to determine experimentally their dynamic characteristics. Additionally, the finite element computer program ANSYS was used to determine its initial numerical dynamic characteristics. The experimental and numerical results were compared resulting in maximum differences of 38.38% between them. To minimize these differences, the finite element model was updated using the global and local automated approach using a sensitivity-based analyses with some uncertain parameters. The differences were finally reduced to 4.4% and 0.21% by the global and the local automated model updatings, respectively. It is concluded that sensitivity-based automated updating is a very effective procedure to obtain the updated finite element model which can reflect the current behavior of a structure.
AtıfScopus14WoS13OpenAlex13İncele - MakaleAçık Erişim2018Scopus SJRQ3Next-generation sequencing of plasmid carrying blaOXA-48 in Klebsiella pneumoniae from Turkey
Düzgün, Azer Özad; Saral, Ayşegül
A carbapenem-resistant Klebsiella pneumoniae strain was isolated in Turkey in 2012 and blaNDM-1 and blaOXA-48 genes were observed in this strain. The aim of this study was to investigate transferability of plasmid bearing blaOXA-48 in K. pneumoniae and to use whole-genome sequencing in order to understand the genetic context of plasmid. K. pneumoniae strain was used as donor in conjugation experiments. Antibiotic susceptibility profile of selected transconjugant was determined. Plasmid was isolated from transconjugant colony and was named as pKPT. Complete sequencing of the pKPT was conducted using a next-generation sequencing. Annotation of the contigs was performed using the Geneious R9, followed by finding open reading frames (ORFs) with selected web-based tools. BLAST analysis was performed at the NCBI BLAST server to determine genes showing more than 90% similarity with these ORFs. Results of antibiotic susceptibility test showed that transconjugant colony was resistant to ampicillin/ sulbactam, piperacillin, and piperacillin/tazobactam. The pKPT plasmid had a length of 45,217 bp and an average G + C content of 49%. Blast analysis revealed that pKPT was included in the IncL/M incompatibility group. The pKPT was found to contain blaOXA-48 within Tn1999.2 transposon without any other antibiotic resistance gene.
AtıfScopus3WoS3OpenAlex5
İncele - MakaleYalnız künye2018Scopus SJRQ2Investigation of high temperature wear resistance of TiCrAlCN/TiAlN multilayer coatings over M2 steel
Sukuroglu, E.E.; Baran, O.; Totik, Y.; Efeoglu, I.
In this study, TiCrAlCN/TiAlN multilayer coatings were deposited on M2 high speed steel substrates by the Closed-Field Unbalanced Magnetron Sputtering system. The chemical composition, microstructure, morphology, mechanical and high temperature wear resistance properties of the coatings were characterized, analyzed and compared to the substrate. The high temperature wear tests were carried out under a load of 2 N at the lap (wear test distance) of 50 m and in dry sliding condition at Room Temperature (RT), 150, 300, 450, and 600 °C on atmospheric conditions. It has been found that the TiCrAlCN/TiAlN multilayer coatings have a higher wear resistance than the M2 substrate. The stable friction behavior and low friction tendency was determined at 600 °C. When the test temperature increased, the wear rates decreased. Narrow and smooth wear tracks and also the lowest wear rate were obtained at 600 °C.
AtıfScopus6WoS6OpenAlex8İncele - MakaleYalnız künye2018Scopus SJRQ1The effect of reiki on pain: A meta-analysis
Demir Doğan, Melike
Objective: Pain is one of the most common symptoms and may lead to important psychological, mental, and physiological problems in individuals. According to data by The Center for Reiki Research, Reiki is an effective approach to decrease the levels of pain, depression, and anxiety. Therefore, the aim of this meta-analysis was to investigate the effect of Reiki on pain level. Methods: Randomized controlled clinical trials in databases of Pubmed, ISI Web of Sciences, and Google Scholar were investigated. 4 randomized controlled studies involving 212 participants were included in the meta-analysis. Results: The result obtained after the final Reiki application was evaluated in VAS pain score. When Reiki (n = 104) group was compared with control group (n = 108), standardized mean difference was observed to be −0.927 (95% CI: −1.867 to 0.0124). Reiki was observed to cause a statistically significant decrease in VAS score. Conclusion: Consequently, this meta-analysis revealed that Reiki was an effective approach in relieving the pain.
AtıfScopus63WoS56OpenAlex93İncele - BildiriYalnız künye2018A third order of accuracy difference scheme for Bitsadze-Samarskii type elliptic overdetermined multi-point problem
Ashyralyyev, Charyyar; Akyüz, Gulzlpa; Ashyralyev, A.; Sadybekov, M.; Lukashov, A.
In this study, a third order of accuracy difference scheme for Bitsadze-Samarskii type multi-point elliptic overdetermined problem is studied. For solution of constructed difference problem stability, almost coercive stability and coercive stability estimates are established. The theoretical statements for the solution of this difference problem are supported by numerical results in test example by using Matlab.
- MakaleAçık Erişim2018Scopus SJRQ2Experimental analysis for heat transfer of nanofluid with wire coil turbulators in a concentric tube heat exchanger
Akyürek, Eda Feyza; Geliş, Kadir; Şahin, Bayram; Manay, Eyüphan
Nanofluids are a novel class of heat transfer suspensions of metallic or nonmetallic nanopowders with a size of less than 100 nm in base fluids and they can increase heat transfer potential of the base fluids in various applications. In the last decade, nanofluids have become an intensive research topic because of their improved thermal properties and possible heat transfer applications. For comparison, an experiment using water as the working fluid in the heat exchanger without wire coils was also performed. Turbulent forced convection heat transfer and pressure drop characteristics of Al2O3-water nanofluids in a concentric tube heat exchanger with and without wire coil turbulators were experimentally investigated in this research. Experiments effected particle volume concentrations of 0.4–0.8 to 1.2–1.6 vol% in the Reynolds number range from 4000 to 20,000. Two turbulators with the pitches of 25 mm and 39 mm were used. The average Nusselt number increased with increasing the Reynolds number and particle concentrations. Moreover, the pressure drop of the Al2O3-water nanofluid showed nearly equal to that of pure water at the same Reynolds number range. As a result, nanofluids with lower particle concentrations did not show an important influence on pressure drop change. Nonetheless, when the wire coils used in the heat exchanger, it increased pressure drop as well as the heat transfer coefficient.
AtıfScopus121WoS110OpenAlex126İncele - BildiriYalnız künye2018Experimental Channel Measurement for Indoor Office Visible Light Communication
Yazgan, Ayhan; Simsek, Cemaleddin; Albayrak, Cenk; Tugcu, Emin; Turk, Kadir; Herencsar, N.
Channel measurement for visible light communication (VLC) is theoretically and experimentally performed in a real office platform. Six armatures composed of phosphor based white LED arrays are fed by designed analog LED drivers. Measurements are taken in a 6m x 7.8m office room which is formed as 10×13 matrix with 60 cm grid distance for both simulation and experiment studies. The link distance between LED arrays and optical receiver is kept minimum 2.5 meters for each measurement. Experimental results are generally in good agreement with simulation results, which are obtained using Barry's theoretical channel model.
AtıfScopus3OpenAlex4İncele - MakaleAçık Erişim2018The relationship between university students' music preferences and drug abuse tendencies and personality traits
Altun, Zühal Dinç; Bülbül, Kenan; Türkkan, Tuğba
The purpose of this study is to determine whether music preferences differ in terms of drug abuse tendencies and personality traits with regard to the type of music that music teacher candidates listen to. The research group of the study was comprised of 141 university students. Research data were collected using the Substance Use Tendency Scale, the Adjective-Based Personality Test (ABPT), and the Personal Information Form developed by the researchers. Pop music (93.6%) was determined to be the music type most listened to, and Heavy Metal music (21.3%) music the type least listened to. While the students were determining their music preferences, they indicated that the moods (99.3%) and the melody of the music (98.6%) were primarily important. The results of the analysis show that there are significant differences in music preferences based on the tendency for drug abuse and on personality traits. Findings have been discussed in the light of the relevant literature, and proposals have been made to professionals working in the fields of research, music therapy and music education.
AtıfScopus4OpenAlex6İncele - MakaleYalnız künye2018Scopus SJRQ2Shelf-life, physicochemical, and nutritional properties of wheat bread with optimized amount of dried chickpea sourdough and yeast by response surface methodology
Hendek Ertop, Muge; Coşkun, Yunus
The aim of this study was to optimize of the instant active dry yeast (A) and the dried chickpea sourdough (B) amount in bread formulation and to evaluate of usage possibilities of dried chickpea sourdough in bread production by examining some quality parameters.Response surface methodology was used to determine the effects of the variable factors (Aand B) on the product volume (V), acceptability value (AV) and pore factor (PF) of the bread. The usage rates were determined 0.63% for A and 10.21% for B.The bread produced according to optimized model (OB) was compared with control bread in terms of some quality parameters. The pore structures of bread samples and microtextural features obtained scanning electron microscopy during shelf life were examined by Image Analysis. Smaller and more homogeneous pore structures were obtained in the bread texture; antioxidant activity, mineral content, microbial shelf life were improved, and the volume and crust thickness of the bread increased by the usage of chickpea sourdough. Practical applications: Chickpea sourdough was dried in oven at low temperature short time condition.The protection of microbial vitality was ensure during the drying processes.The level of instant active dry yeast (A) and dried sourdough (B) were optimized with RSM. The usage rates were determined 0.63% for A and 10.21% for B.Optimized bread and control bread were compared in terms of various quality properties. The antioxidant activity, mineral content, microbial shelf life, and physicochemical properties were improved.
AtıfScopus20WoS16OpenAlex23İncele - MakaleAçık Erişim2018Obesity in adolescents and the risk factors
Eker, Hasan Hüseyin; Taşdemir, Mustafa; Mercan, Sümeyye; Mucaz, Meltem; Bektemur, Güven; Sahinoz, Saime; Ozkaya, Emin
Objectives: This study aims to investigate the frequency of obesity and to identify possible risk factors affecting obesity in adolescents. Materials and methods: This cross-sectional study included a total of 1,357 adolescents between March 2011 and May 2012 in Beyoglu district of Istanbul province of Turkey. The questionnaire including 38 questions which was developed based on the Youth Risk Behavior Survey, which is used by the Center for Disease Control and Prevention (CDC), was used for the data collection. The weight and height of the participants were measured and their body mass index (BMI) values were calculated. Results: Of all participants, 54.8% were females, 5% of them were underweight, 12.6% were overweight, and 2.6% were obese. Among the male participants, the BMI values were higher (21.06±3.32 kg/m2) than females (20.26±2.88 kg/m2) (p<0.0001). The obesity ratio was higher in males (p<0.0001) and in children of highly educated parents (p<0.05). Of the participants, 23.5% were physically active. Physical activity level was higher in males, compared to females (p<0.0001). The rate of breakfast habit was higher in males than females (p=0.002). Healthy diets and losing weight in a healthy way were more commonly accepted by the students in the public schools, compared to those in private schools (p<0.0001). Conclusion: Obesity is an important public health problem and proper eating habits and regular physical activity should be encouraged. High-income families should also encourage their children to become more aware of the importance of physical activity. The right time for this is childhood and adolescence, in which permanent habits can be easily acquired.
AtıfScopus17WoS9OpenAlex21
İncele - MakaleYalnız künye2018Scopus SJRQ2Increasing adherence to mine plan through data integration and process change
Kahraman, Muhammet Mustafa; Dessureault, Sean
This paper focuses on the development of a decision support element to control real-time adherence to mine plan within a control room environment. This system, known as a mine planning screen (MPL), integrates mine planning and production processes. The key inputs are production data tracked by the fleet management system and mine plans entered by mine planners into spreadsheets. The data are integrated with the use of database query languages and MPL charts are displayed in a web environment. The MPL screen displays two types of information: real-time adherence to plan by pit and historical adherence by crews. The objective of the screen is to increase adherence to the overall plan, a key part of a larger real-time blending initiative. This research discusses the technical development of the new tool, its deployment and peer pressure technique for user motivation.
AtıfScopus2WoS2OpenAlex4İncele - BildiriYalnız künye2018Performance of Visible Light Communication with Colour Shift Keying Modulation and Polar Code
Simsek, Cemaleddin; Tugcu, Emin; Albayrak, Cenk; Yazgan, Ayhan; Turk, Kadir; Herencsar, N.
Visible light communication (VLC) is an emerging technology to fulfill both illumination and communication purposes considered as either an alternative or a support system for some of scenarios carried by RF communication systems. Colour shift keying (CSK) is the modulation given in IEEE 802.15.7 VLC standard which proposes Reed-Solomon as error correction code. Polar code is the first theoretically proven capacity achieving error correction code with low encoding and decoding complexities. Performance of Polar code with belief propagation decoder has not been studied under VLC CSK scheme. In this study we investigate performance of Polar code with belief propagation decoder under VLC CSK scheme and compare it with performance of Reed-Solomon code. Result show that Polar code with belief propagation decoder outperforms Reed-Solomon code by at least 1.5dB.
AtıfScopus4WoS4OpenAlex4İncele - BildiriYalnız künye2018Fast and accurate classifier-based brain-computer interface system using single channel EEG data
Maleki, Masoud; Manshouri, Negin; Kayikcioglu, Temel
In brain-computer interface system (BCIs), direct communication between humans and computers is performed by analyzing neural signals and transforming them into digital signals. In the continuation of our previous works, in this paper, we advanced the proposed BCI system that was based on the gaze on rotating vanes. The speed of communication and convenience of the user are very important factors in BCI systems. Therefore, in this paper, for the convenience of the user, a single EEG channel was used. Also, for to increase the speed of the system, we tried to the classification of 0.5 sec epochs with a partial least squares regression (PLSR) as a fast classifier. In addition, we computed the information transfer rate (ITR) that has proved our proposed BCI system is fast and accurate. This system could be used in real-time implementations due to having high classification rate, speed and convenience of the user.
AtıfScopus6OpenAlex5İncele - MakaleAçık Erişim2018Energy concept understanding of high school students: A cross-grade study
Takaoğlu, Zeynep Başkan
Energy is a difficult concept to be understood by students of all levels. Thus, the aim of the study is to determine how high school students at different levels perceive the energy and related concepts. In line with this purpose, 173 students in total of which 57 ones of the 9th grade, 94 ones of the 10th grade and 22 ones of the 11th grade participated in the study in which developmental research method of descriptive research design has been conducted. Four open-ended questions about energy and related concepts have been asked to the students in the study. As a result of the study, it is concluded that the students use energy instead of work, power, repulsion and pulling concepts and they consider energy as a feature specific to living creatures and moving situations. The potential and kinetic energy types are most expressed ones. The students frequently give examples from renewable and non-renewable energy types and they classify them accordingly. It is also concluded that they don’t have enough information about conservation of energy. It is thought that this misconception among the students emerges because energy and related concepts are taught them disconnected in different lessons of different disciplines and they do not understand preconceptions about energy and related notions. It is considered that the concept networks, concept maps, and conceptual change texts will help to relate energy concepts in students' minds.
AtıfScopus10OpenAlex14İncele - Kitap BölümüYalnız künye2018Reputation management as a strategic practice of public relations in the frame of Turkey
Güllüpunar, Hasan
- MakaleAçık Erişim2018Scopus SJRQ3Bounds for radii of starlikeness and convexity of some special functions
Aktaş, Ibrahim; Baricz, Árpád; Orhan, Halit
In this paper we consider some normalized Bessel, Struve, and Lommel functions of the first kind and, by using the Euler-Rayleigh inequalities for the first positive zeros of a combination of special functions, we obtain tight lower and upper bounds for the radii of starlikeness of these functions. By considering two different normalizations of Bessel and Struve functions we give some inequalities for the radii of convexity of the same functions. On the other hand, we show that the radii of univalence of some normalized Struve and Lommel functions are exactly the radii of starlikeness of the same functions. In addition, by using some ideas of Ismail and Muldoon we present some new lower and upper bounds for the zeros of derivatives of some normalized Struve and Lommel functions. The Laguerre-Pólya class of real entire functions plays an important role in our study.
AtıfScopus37WoS36TR Dizin7İncele