Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Gul, Muhammet(102)
- Güler, Ömer(69)
- Akkurt, Nevzat(68)
- Tekin, H.O.(52)
- ALMisned, Ghada(49)
- Yucesan, Melih(49)
- Celik, Erkan(45)
- Zengin, Gokhan(40)
- Serdar, Osman(39)
- Kocabaş, Mehmet(37)
- Aslan, Naim(31)
- Baskonus, Haci Mehmet(31)
- Bulut, Hasan(31)
- Mete, Suleyman(31)
- Paksoy, Mehmet Yavuz(30)
- Kök, Mediha(27)
- Ince, Muharrem(26)
- Yildirim, Ozal(26)
- Özkul, İskender(26)
- Sulaiman, Tukur Abdulkadir(25)
- Topal, Murat(25)
- Guler, Omer(24)
- Serin, Faruk(23)
- Benzer, Fulya(22)
- Erten, Fusun(22)
- Alataş, Mevlüt(21)
- Güler, Seval Hale(21)
- Baykal, Duygu Sen(20)
- Taşgın, Yahya(20)
- Kutlu, Banu(19)
- Onat, Onur(19)
- Sahin, Kazim(19)
- Tanyol, Mehtap(19)
- Torğut, Gülben(19)
- Yildirim, Numan(19)
- Kahraman, Gökhan(18)
- Orhan, Cemal(18)
- Say, Yakup(18)
- Susam, Selim Orhun(18)
- Utku, Anıl(18)
Yayınlar
- MakaleYalnız künye2021Scopus SJRQ1Experimental design approach for ultra-fast nickel removal by novel bio-nanocomposite material
Ince, Olcay K.; Aydogdu, Burcu; Alp, Hevidar; Ince, Muharrem
In the present study, novel chitosan coated magnetic magnetite (Fe3O4) nanoparticles were successfully biosynthesized from mushroom, Agaricus campestris, extract. The obtained bio-nanocomposite material was used to investigate ultra-fast and highly efficient for removal of Ni2+ ions in a fixed-bed column. Chitosan was treated as polyelectrolyte complex with Fe3O4 nanoparticles and a Fungal Bio-Nanocomposite Material (FBNM) was derived. The FBNM was characterized by using X-Ray Diffractometer (XRD), Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy (SEM-EDS), Fourier Transform Infrared spectra (FTIR) and Thermogravimetric Analysis (TGA) techniques and under varied experimental conditions. The influence of some important operating conditions including pH, flow rate and initial Ni2+ concentration on the uptake of Ni2+ solution was also optimized using a synthetic water sample. A Central Composite Design (CCD) combined with Response Surface Modeling (RSM) was carried out to maximize Ni2+ removal using FBNM for adsorption process. A regression model was derived using CCD to predict the responses and analysis of variance (ANOVA) and lack of fit test was used to check model adequacy. It was observed that the quadratic model, which was controlled and proposed, was originated from experimental design data. The FBNM maximum adsorption capacity was determined as 59.8 mg g−1. Finally, developed method was applied to soft drinks to determine Ni2+ levels. Reusability of FBNM was tested, and the adsorption and desorption capacities were not affected after eight cycles. The paper suggests that the FBNM is a promising recyclable nanoadsorbent for the removal of Ni2+ from various soft drinks.
AtıfScopus11WoS11OpenAlex7
İncele - MakaleYalnız künye2021Scopus SJRQ2The assessment of basic blue 41 textile dye decolorisation using the Fenton process: response surface methodology optimisation and toxicity evaluation
Tanyol, Mehtap; Cikcikoglu Yildirim, Nuran; Tatar, Sule; Serdar, Osman; Yildirim, Numan
The biochemical biomarkers (Catalase (CAT), glutathione s-transferase (GST), cytochrome P4501A1 (CYP1A1450) activities and glutathione (GSH), malondialdehyde (MDA) levels) of D. polymorpha exposed to the basic blue 41 (BB41) solutions for 24 and 96 h before and after the Fenton process (FTP) were evaluated to investigate the efficiency of the FTP. The optimum conditions for the removal of BB41 were set using central composite design (CCD), which is a response surface methodology (RSM) module in the Design-Expert® software. The optimal conditions were found to be 27.87 min, 3.49 mg/L, and 0.04 for reaction time, initial BB41 concentration, and Fe2+/H2O2 molar ratio, respectively, resulting in maximum (99%) removal efficiency. After FTP, the MDA and GSH levels decreased significantly during the 24 and 96 h. CAT activities were increased after treatment. No statistically significant changes were observed in the CYP1A1 levels after FTP. GST activities decreased during 24 h but increased during 96 h after FTP. CYP1A1450, catalase, GST activities and MDA, GSH levels of D. polymorpha are useful biomarkers to evaluate the efficiency of FTP. This study suggests that BB41 dye must be further treated after the FTP to minimise the ecotoxicological risk.
AtıfScopus8WoS6OpenAlex8İncele - Kitap BölümüYalnız künye2021Fine–kinney-based occupational risk assessment using interval-valued pythagorean fuzzy vikor
Gul, Muhammet; Mete, Suleyman; Serin, Faruk; Celik, Erkan
This chapter aims at the adaptation of the Fine–Kinney occupational risk assessment concept into the VIKOR multi-attribute decision-making method with an interval-valued Pythagorean fuzzy set. The classical fuzzy set theory has been improved by proposing a number of extended versions. One of them is the Pythagorean fuzzy set. It has been firstly developed by Yager (IEEE Transactions on Fuzzy Systems 22:958–965, [1]). In this chapter, we use this type of fuzzy set with VIKOR since it reflects uncertainty in occupational risk assessment and decision-making better than other fuzzy extensions. To demonstrate the proposed approach applicability, a case study regarding the activities of the surface treatment area in a chrome plating unit of a gun factory is performed. Some additional analysis to test the solidity and validity of the approach is executed. Finally, the Python codes in the implementation of the proposed approach are given for scholars and practitioners for usage in further studies.
AtıfScopus14OpenAlex5İncele - MakaleAçık Erişim2021Scopus SJRQ3Determination of fatty acids in Allium tuncelianum (Tunceli garlic) by gas chromatography with flame ionization detection (GC–FID)
Ugur, Yilmaz; Karaaslan-Ayhan, Nagihan; Icen, M. Sina; Bicim, Tulin; Erdogan, Selim; Yaman, Mehmet
Garlic has an important place in daily nutrition. It is consumed by people because of its antimicrobial, antibacterial, and antioxidant properties, and it is also known to be good for many diseases. Along with these properties of garlic, its fatty acid content is also important. The goal of this study is to determine the fatty acids in Allium tuncelianum (Tunceli garlic), which grows naturally in Tunceli, Turkey, by gas chromatography with flame ionization detection (GC–FID). Fifteen of 37 fatty acids studied were detected in Allium tuncelianum, and the primary fatty acids in the sample extracts were determined to be the polyunsaturated fatty acid (PUFA) linoleic acid (C18:2n6c, 41.595%) and the monounsaturated fatty acid (MUFA) oleic acid (C18:1n9c, 33.302%). Small quantities of saturated fatty acids (SAFAs) were also present, including palmitic acid (C16:0, 11.739%), henoicosanoic acid (C21:0, 6.946%), and stearic acid (C18:0, 2.362%).
AtıfScopus12WoS8OpenAlex11İncele - EditoryalYalnız künye2021Preface
Gul, Muhammet; Mete, Suleyman; Serin, Faruk; Celik, Erkan
AtıfScopus2İncele - MakaleAçık Erişim2021Scopus SJRQ3Determination of anthocyanins and anthocyanidins in the wild grape (Vitis sylvestris Gmelin) by high-performance liquid chromatography-diode array detection (HPLC-DAD)
Karaaslan-Ayhan, Nagihan; Yaman, Mehmet
The determination of anthocyanins and anthocyanidins in wild grapes (Vitis sylvestris Gmelin) from Tunceli-Turkey are reported together with the influence of the extraction conditions on the results. Representative sets of anthocyanins (delphinidin-3-o-glucoside, cyanidin-3-o-glucoside, pelargonidin-3-o-glucoside, malvidin-3-o-glucoside) and anthocyanidins (delphinidin, cyanidin, pelargonidin, malvidin) were simultaneously determined by high performance liquid chromatography with diode array detection (HPLC-DAD). The extraction conditions including the solvent type, extraction time and liquid:solid ratio (v:w) were optimized. The anthocyanin and anthocyanidin contents changed significantly depending on the extraction conditions. Malvidin-3-o-glucoside was identified to be the primary compound.
AtıfScopus10WoS8OpenAlex11İncele - MakaleAçık Erişim2021Scopus SJRQ3Survival of Shiga Toxin-Producing Escherichia coli (STEC) Serogroups During Production and Storage of Yogurt
Celik1, G.; Dikici, A.; Koluman, A.
In this study, the survival of Escherichia coli O157:H7 and non-O157 STEC serogroups of O26, O111, O103, and O145 were investigated during production and storage of yogurt. For this purpose, pathogens were individually inoculated into milk after pasteurization along with the starter culture (approximately 7.00±1.00 log10 cfu/g). After incubation at 44oC (about 180 min), yogurt samples were capped and stored at 4oC for 20 days. Pathogens were enumerated at 0, 5, 10, 15, and 20th days of storage. Lactic acid content (%) and pH of the samples were also screened. Moreover, mesophilic Lactococcus spp. and mesophilic Lactobacillus spp. were enumerated during production of yogurt.After incubation, the number of E. coli O157, O26, O103, O145, O111were 6.76±0.45, 6.64±0.53, 7.12±0.43, 6.00±1.39, 5.89±1.37 log10 cfu/g, respectively. A significant decrease was determined in all groups during the storage of yogurt samples at 4oC (p<0.05). It was detected on the 20th day of storage that the number of E. coli O157:H7 and non-O157 STEC serogroups of O103 and O145 were under the detection limit. However, STEC O26 and O111 were viable around 1.51±0.98 and 1.18±0.62 log10 cfu/g respectively. Results of the study showed that Escherichia coli O157:H7 and non-O157 STEC serogroups might pose a potential health risk during production and storage of yogurt.
AtıfScopus4OpenAlex5İncele - MakaleYalnız künye2021Scopus SJRQ1Evaluation of the efficiency of chlorpyrifos-ethyl remediation by Methylobacterium radiotolerans and Microbacterium arthrosphaerae using response of some biochemical biomarkers
Onder Erguven, Gokhan; Tatar, Şule; Serdar, Osman; Yildirim, Nuran Cikcikoglu
This study reveals out detoxifying and antioxidant enzyme response of Gammarus pulex exposed/polluted to chlorpyrifos-ethyl insecticide before and after biodegradation/bioremediation by Methylobacterium radiotolerans and Microbacterium arthrosphaerae. Cytochrome P450 1A1, glutathione S-transferase, catalase, and superoxide dismutase activities in G. pulex exposed to chlorpyrifos-ethyl before and after bioremediation/biodegradation by these two bacteria during 24 and 96 h tested by using commercial ELISA kits. The activity of catalase enzyme was decreased depending on chlorpyrifos-ethyl before and after bioremediation/biodegradation the enzyme activity was increased repeatedly. Superoxide dismutase activity level increased after chlorpyrifos-ethyl exposure in 96 h (p > 0.05). Following bioremediation, superoxide dismutase enzyme activity decreased again during 24 h (p > 0.05) and increased during 96 h (p < 0.05). Statistical differences were not found in cytochrome P450 1A1 enzyme activity before and after the process (p > 0.05). No significant differences were determined during the activity of glutathione S-transferase in 24 h (p > 0.05). The activities of glutathione S-transferase were increased after exposure of chlorpyrifos-ethyl during 96 h. After bioremediation; the activity of glutathione S-transferase increased even more (p < 0.05). The results determined that activities of G. pulex at superoxide dismutase, catalase, and glutathione S-transferase are common biomarkers for revealing out the efficiency of bioremediation of chlorpyrifos-ethyl with these two types of soil bacteria. [Figure not available: see fulltext.]
AtıfScopus15WoS14OpenAlex16
İncele - Kitap BölümüYalnız künye2021Challenges, novel applications, and future prospects of chalcogenides and chalcogenide-based nanomaterials for photocatalysis
Ates, Mehmet; Tanaydın, Mehmet Kayra; Yılmaz, Ersen
Nanomaterials are composed of several atoms or molecules, which may be of various sizes and morphologies. Manmade nanomaterials are specially produced to take advantage of the unique properties of nanoscale. There are many metal chalcogenides with different structures and compositions such as CdSe, InAs, CdS, GaN, InGeAs, CdTe, PbS, PbSe, ZnS, Na2S, CaTe, Ti2S, and Cu2Se. The diversity of metal chalcogenides is related to the orbit of transition metals. In this chapter, new studies using chalcogenide compounds as photocatalysts were explained under the subtopics of metal chalcogenides and their properties, semiconductive nanostructures, nanomaterial production technique, chemical synthesis methods, and metal chalcogenides as photocatalysts. Novel applications of metal chalcogenide-based materials like water splitters, organic pollutant degraders, self-cleaning agents chalcogenide glasses and thermoelectric materials are explained in detail under the relevant headings. Future prospects of chalcogenides are also evaluated from a different perspective.
AtıfScopus30OpenAlex26İncele - Kitap BölümüYalnız künye2021Fine–kinney-based occupational risk assessment using interval type-2 fuzzy vikor
Gul, Muhammet; Mete, Suleyman; Serin, Faruk; Celik, Erkan
In this chapter, we improved Fine–Kinney occupational risk assessment approach with interval type-2 fuzzy VIKOR (IT2FVIKOR). VIKOR is a compromise multi-attribute decision-making method proposed by Opricovic (1998). Similar to other compromised solution-based approaches, it considers the solution which is closest to the ideal. In this chapter, we adapted the interval type-2 fuzzy sets (IT2FSs) into VIKOR as it reflects the uncertainty well in decision-making. IT2FVIKOR algorithm under the Fine–Kinney concept provides a useful and solid approach to the occupational health and safety risk assessment. In addition to proposing this new approach, a case study is performed in a gun and rifle barrel external surface oxidation and coloring unit of a gun factory. A validation and a sensitivity analysis is also attached to this study. Finally, the proposed approach is implemented in Python.
AtıfScopus4OpenAlex5İncele - MakaleAçık Erişim2021Scopus SJRQ2Metaheuristic Approaches Integrated with ANN in Forecasting Daily Emergency Department Visits
Pekel, Engin; Gul, Muhammet; Celik, Erkan; Yousefi, Samuel
The overall service quality level of Emergency Departments (EDs) can be improved by accurate forecasting of patient visits. Accordingly, this study aims to evaluate the use of three metaheuristic approaches integrated with Artificial Neural Network (ANN) in forecasting daily ED visits. To do this, five performance measures are used for evaluating the accuracy of the proposed approaches, including Bayesian ANN, Genetic Algorithm-based ANN (GA-ANN), and Particle Swarm Optimization algorithm-based ANN (PSO-ANN). The outputs of this study show that the PSO-ANN model provides the most dominant performance in both the training and testing process. The lowest error is obtained with a mean absolute percentage error (MAPE) of 6.3%, Mean Absolute Error (MAE) of 42.797, Mean Squared Error (MSE) of 2499.340, Root Mean Square Error (RMSE) of 49.933, and R-squared (R2) of 0.824 on the training dataset. The lowest error with an MAPE of 6.0%, MAE of 40.888, MSE of 2839.998, RMSE of 53.292, and R2 of 0.791 is also obtained on the testing process.
AtıfScopus7WoS5OpenAlex7İncele - MakaleYalnız künye2021Scopus SJRQ4Balneotherapy Features of Natural Thermal Source from Pertek (Turkey-Tunceli) Due to Its Some Chemical, Radioactivity and Biological Parameters
Sönmez, Pinar Erecevit
It can also be defined as a discipline that reviews the factors of balneology or hydrotherapy, which are alternative treatment methods for public health, from chemical, biological and medical aspects. In this study, it was aimed to investigate whether the underground waters in the Pertek district of Tunceli province are suitable for balneology. Chemical, radioactivity analysis, microbiological quality, antimicrobial activities were determined in relation to natural groundwater and its ability to be a natural healing source was investigated. When the chemical content is examined, it was determined to be bromide amount is 0.24 mg / L, Iodine (I); 1.9 mg / L, sulfur (S); 0.02 mg / L, boron (B): 2676 µg / L, silicium (Si); 1.9 mg / L. With respect to the results, thermal water has the feature to be used in balneolotherapy. According to the results of the radioactivity analysis, alpha (α) is 0.15 Bq / L; Beta (β) is <0.30 Bq / L and radon (Rn) is <13.4 Bq / L tritium (T) content is <10 Bq / L (<83.33 TB) and it is included in both mineral and young water group. This ground water and they comply with the standards in terms of microbiology (Total bacteria, coliform, Escherichia coli). Its antibacterial, antifungal and antidermatophyte properties prove to be a healing source. We confirmed the effectiveness of this healing water to both protect and promote human health as a drinking cure and reach the newest and most effective treatment modalities by using related water in Health and Thermal Tourism.
- MakaleYayıncıda açık erişim2021Scopus SJRQ4Effects of magnesium biotinate supplementation on serum insulin, glucose and lipid parameters along with liver protein levels of lipid metabolism in rats
Sahin, Kazim; Orhan, Cemal; Kucuk, Osman; Erten, Fusun; Tuzcu, Mehmet; Sahin, Nurhan; Ojalvo, Sara Perez; Komorowski, James Richard
The objective of this study was to investigate the effects of a novel form of biotin (magnesium biotinate) on serum glucose, lipid profile, and hepatic lipid metabolism-related protein levels in rats. Forty-two rats were divided into six groups and fed a standard diet-based egg white powdered diet supplemented with either d-biotin at 0.01, 1, or 100 mg/kg BW or magnesium biotinate at 0.01, 1, or 100 mg/kg BW for 35 days. Neither form of biotin influenced (p > 0.05) serum glucose or insulin concentrations. Serum total cholesterol and triglyceride decreased with biotin from both sources (p < 0.05). Concentrations were lower with magnesium biotinate when comparing the 1 mg/kg dose (p < 0.05). Serum, liver, and brain biotin and liver cyclic guanosine monophosphate (cGMP) concentrations were greater when rats were treated with magnesium biotinate versus d-biotin, particularly when comparing the 1 and 100 mg/kg dose groups (p < 0.05). Both biotin forms decreased the liver SREBP-1c and FAS and increased AMPK-a1, ACC-1, ACC-2, PCC, and MCC levels (p < 0.05). The magnitudes of responses were more emphasized with magnesium biotinate. Magnesium biotinate, compared with a commercial d-biotin, is more effective in reducing serum lipid concentrations and regulating protein levels of lipid metabolism-related biomarkers.
AtıfScopus5WoS5OpenAlex5İncele - MakaleAçık Erişim2021Scopus SJRQ2The effect of nurses' compassion on burnout: A cross-sectional study
Kaplan Serin, Emine; Özdemir, Ahmet; Işik, Kevser
Purpose: This study was carried out to determine the effect of nurses' compassion on burnout. Design and Methods: This cross-sectional descriptive study was conducted with 177 nurses. An introductory information form, the compassion scale and the Maslach burnout inventory were used as the data collection tools. Frequency, percentage, t test, analysis of variance, Kruskal-Wallis, correlation, and regression were used in the analysis of the data. Findings: The majority of the participants were determined to be female, married and university graduates. It was determined that there was a significant negative relationship between the nurses' sense of compassion and burnout levels, and burnout decreased as compassion increased. Practical Implication: Burnout and compassion fatigue may lead to inadequate care for the patient. This situation will negatively influence nurses' care quality.
AtıfScopus13WoS10OpenAlex14İncele - MakaleYalnız künye2021Scopus SJRQ2Infrared drying of dill leaves: Drying characteristics, temperature distributions, performance analyses and colour changes
Tezcan, Derya; Sabancı, Serdal; Cevik, Mutlu; Cokgezme, Omer Faruk; Icier, Filiz
Thin-layer drying behaviour of dill leaves samples under three different infrared radiation power intensities was investigated. Diffusion Approach was found to be the best model that describes the drying behaviour of dill leaves. Effective diffusivity values were 6.97 × 10−9, 6.84 × 10−9 and 8.96 × 10−9 m2/s for power intensities of 1790, 1970 and 2070 W/m2, respectively. According to the first and second law efficiencies, the infrared drying system was more efficient at higher power intensities (p < 0.05). However, the total colour change was maximum at the highest power intensity. For the investigated infrared drying conditions, 1970 W/m2 was recommended as the best-infrared power intensity applied for drying of dill leaves by taking into account both performance analyses and quality changes.
AtıfScopus40WoS34OpenAlex44İncele - MakaleYalnız künye2021Scopus SJRQ1İkinci Katil [The Second Murderer]: A Turkish Adaptation of Shakespeare's Scottish Play, Macbeth
Öğütcü, Murat
Serhat Yiğit’s İkinci Katil (2017) is a Turkish adaptation of Shakespeare’s Macbeth. Reminiscent of Tom Stoppard’s Rosencrantz and Guildenstern are Dead (1966), it focuses on minor characters and their otherwise disregarded and peripheral microcosms. However, different from the post-modern self-reflexivity of Stoppard’s play, Yiğit uses an Aristotelian model in his play. Through its concentration on hitherto insignificant minor characters, non-self-reflexive intertextuality, and non-Brechtian acting, İkinci Katil departs both from conventional Shakespearean tragedies and conventionalised avant-garde post-Shakespearean interpretations of these tragedies. The construction of the stage and scenery allows to construct and to deconstruct the play and the source text’s interplay of textual allusions by setting the story of Macbeth to the periphery and the story of the Second Murderer, Warden, to the centre of the action. Therefore, this article will analyse Yiğit’s İkinci Katil and illustrate how the play borrows, adapts and transforms Shakespeare’s Macbeth.
AtıfScopus2WoS1OpenAlex3İncele - MakaleAçık Erişim2021Scopus SJRQ2The usage of Ohmic heating in milk evaporation and evaluation of electrical conductivity and performance analysis
Ariç Sürme, Seda; Sabancı, Serdal
Ohmic heating is based on the principle of heating by passing an alternating current through the product between two electrodes and is an increasingly current electrical heating technique in food applications. The main purpose of the present study is to evaporate milk (cow's milk) from 7.85 kg-water/kg-dry matter (DM) content to approximately 3 kg-water/kg-DM content under atmospheric conditions in different voltage gradients and to examine the electrical conductivity (EC) value during the evaporation process. Also, performance evaluation was determined and compared with the traditional method. It was determined that the total process time in the Ohmic heating assisted evaporation (OHAE) process was 31–92.5 min, while in the traditional evaporation process, the total process time was 41.10 ± 2.1 min. The EC value was 0.43–1.89, 0.44–1.89, and 0.44–1.92 S/m for 7, 9, and 11 V/cm, respectively. In the OHAE process, it was determined that as the voltage gradient increased, the energy and exergy efficiency increased. The lowest energy and exergy efficiency values were obtained in the traditional method. In general, OHAE can be applied to milk, and it was a highly efficient process. Practical applications: Ohmic heating is one of the current electrical heating techniques studied in many areas by researchers. In this study, the change in electrical conductivity and performance values during the milk evaporation process was examined and compared with the traditional method. The OHAE process was more efficient than the traditional method in terms of both energy and exergy efficiency. It is thought that this evaluation will contribute as a data source for both industry and pilot-scale designs. Besides, it will contribute data to the literature with the exergy analysis that is limited in the Ohmic heating process. As a result, a concentrated milk sample with high yield and approximately 3 kg water/kg DM content was obtained.
AtıfScopus21WoS16OpenAlex20İncele - MakaleAçık Erişim2021Scopus SJRQ2Intercultural awareness, communication, and empathy skills in nurses and midwives working in provinces with mass migration
Gümüşsoy, Süreyya; Dal, Nursel Alp; Beydağ, Kerime Derya; Toker, Eylem
Purpose: The study was to evaluate the intercultural awareness, communication, and empathy skills of midwives and nurses (n = 479). Design and Methods: The descriptive study data were collected using the Communication-Skills-Scale (CSS), the Basic-Empathy-Scale (BES), and the Intercultural-Awareness-Scale (IAS). Findings: The total average scores of the CSS, BES, and IAS were found to be 100.07 ± 13.03, 70.70 ± 13.99, and 83.51 ± 14.24, respectively. There was a statistically significant difference between age, education, position, experience and the BES and IAS; gender, providing care for Syrian patients and the CSS and BES; marital status and the BES (P %3C.05). Practice Implications: Nurses and midwives have important responsibilities in terms of protecting and improving the health of migrant women.
AtıfScopus7WoS6OpenAlex9İncele - MakaleYalnız künye2021Scopus SJRQ1Assessment of Seismic Behavior Factor of Code-Designed Steel–Concrete Composite Buildings
Etli, Serkan; Güneyisi, Esra Mete
In this study, the seismic behavior factor of steel–concrete composite buildings was examined. For this purpose, 5-, 10-, 15- and 20-story composite moment-resisting frame (CMRF) buildings having concrete-filled steel tube columns and composite beams were designed at medium ductility (DCM) and high ductility (DCH) levels as per the regulations of Eurocode 8. Examined DCM structures were designed for a PGA of 0.2 g while DCH structures were designed for a PGA of 0.4 g. SeismoStruct software was utilized in the design and performance assessment of the case study structures. Nonlinear static pushover and incremental dynamic analyses were used. In the pushover analysis, the uniform and triangular load distributions were adopted while 12 earthquake ground motions were employed in the dynamic analysis. The effect of ductility levels and number of stories on the seismic behavior of CMRFs was studied using the results of the nonlinear analysis. To this, the variation in the lateral response, global yielding value, code-based behavior factor and component, and dynamic behavior factor were presented for CMRF structures with DCM and DCH. It was observed that the behavior factor of all CMRFs exhibited well above the design assumptions, especially DCM class CMRFs.
AtıfScopus16WoS11OpenAlex34İncele - MakaleYalnız künye2021Scopus SJRQ2Effect of graphene reinforcement on hybrid bioceramic coating deposited on the produced porous Ti64 alloys
Aslan, N.; Aksakal, B.
Porous-Ti64 alloys (P-Ti64), produced at various porosities by hot-pressing technique with the help of Mg spacer, were coated by hybrid-Graphene Oxide (rGO) reinforced-hydroxyapatite (HAp), using the sol–gel method. The synthesized rGO powder was used in reinforcing HAp by the Modified Hummers method having 30 µm particle size and nano (nm) scale layer thickness. Hybrid coatings were executed on Ti64 substrates in four different groups as single-HAp, HAp reinforced with 0.5 wt%, 1.0 wt% and 1.5 wt% rGO for three different porosities (41, 52, and 64%) were characterized by FT-IR, Raman, XRD and SEM. The average 21 µm coating film thicknesses were obtained and desirably, the only superficial pores of the substrates were closed by coating material rather than the inner connected open pores. It was also shown that 0.5 wt% and 1.0 wt% rGO reinforcements into HAp prevented crack formation on the Ti64 surfaces, whereas 1.5 wt% rGo reinforcement and single-HAp coatings caused. The highest adhesion strength values were achieved at low porosities (41–52%) and of 0.5–1.0 wt% rGO reinforcements through the adhesion tests.
AtıfScopus14WoS12OpenAlex20İncele