Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Akkurt, Nevzat(31)
- Gul, Muhammet(11)
- Yucesan, Melih(11)
- Paksoy, Mehmet Yavuz(7)
- Serdar, Osman(7)
- Tanyol, Mehtap(7)
- Torğut, Gülben(7)
- Utku, Anıl(7)
- Xu, Qian(7)
- Aksu, Önder(6)
- Alataş, Mevlüt(6)
- Kocabaş, Mehmet(6)
- Xiong, Yaxuan(6)
- ALMisned, Ghada(5)
- Akmaz, Düzgün(5)
- Alp Dal, Nursel(5)
- Aslan, Naim(5)
- Dal, Nursel Alp(5)
- Du, Yanping(5)
- Eldin, Sayed M.(5)
- Guler, Omer(5)
- Ince, Muharrem(5)
- Qiang, Yujie(5)
- Say, Yakup(5)
- Tekin, H.O.(5)
- Topal, Murat(5)
- Yildirim, Numan(5)
- Yilmaz, Ersen(5)
- Zengin, Gokhan(5)
- Zhang, Hui(5)
- Aksakal, B.(4)
- Basgoz, Oykum(4)
- Can, Umit(4)
- Etli, Serkan(4)
- Ezer, Tülay(4)
- Güler, Ömer(4)
- Pekdemir, Mustafa Ersin(4)
- Pıhtılı, Güzin(4)
- Susam, Selim Orhun(4)
- Tasar, Neslihan(4)
Yayınlar
- MakaleYalnız künye2022Scopus SJRQ4Semi-invariant submanifolds of normal complex contact metric manifolds
Vanli, Aysel Turgut; Ünal, Inan
In this paper, we study on semi-invariant submanifolds of normal complex contact metric manifolds. We give the definition of such submanifolds and we obtain useful relations. Moreover, we give the integrability conditions of distributions.
- MakaleAçık Erişim2022Scopus SJRQ2A statistical overview to the chromosome characteristics of some Centaurea L. taxa distributed in the Eastern Anatolia (Turkey)
Açar, Mikail; Taşar, Neslihan
This study performed statistical analyses based on chromosome micromor-phology of 18 Centaurea taxa, two of which are endemic. ANOVA, Correlation analy-sis, Discriminant analysis and Cluster analysis were performed to determine the relationships between taxa based on chromosomal features. In addition, according to the data obtained from these analyses, the relationships between taxa and sections were tried to be interpreted. As a result of the analyses, the taxa C. drabifolia Sm. floccosa (Boiss.) Wagenitz & Greuter, C. kotschyi (Boiss. & Heldr.) Hayek var. floccosa (Boiss.) Wagenitz and C. behen L. and C. polypodiifolia Boiss pseudobehen (Boiss.) Wagen-itz were located close to each other. These taxa are located in the same sections in the morphological classification. Besides, in the Discriminant analysis, the taxa of Acrocen-tron, Microlophus, Cheirolepis sections were closely located compared to all other taxa. However, results were not seen to cover all taxa of the sections. This study revealed various chromosomal characteristics of some Centaurea taxa distributed in the Eastern Anatolia. It also performed statistical analyses on these data. While determining the relationships between taxa according to chromosomal characteristics, comparing chromosomal formulas and indices collectively and evaluating the relationships was found to be relatively consistent with morphological classification.
AtıfScopus3WoS3OpenAlex3
İncele - MakaleAçık Erişim2022Scopus SJRQ3The Effectiveness Of Trigger Point Treatment In Chronic Pelvic Pain; A Pilot Randomised Controlled Trial; [Wirksamkeit der Triggerpunkt-Therapie bei chronischen Unterbauchschmerzen – eine randomisierte kontrollierte Pilotstudie]
Atas, Kubra; Mutlu, Ebru Kaya; Yasa, Cenk; Ugurlucan, Funda Gungor
Objective To investigate the effectiveness of ischemic compression and low-level laser therapy methods combined with exercise on the myofascial trigger points in women with Chronic Pelvic Pain and to determine which method is more effective. Methods It was a parallel designed, single-blind pilot randomized clinical trial. Patients were recruited at physiotherapy laboratory of the Istanbul University from September 2017 to June 2019. Twenty-eight women patients with Chronic Pelvic Pain were included into the trial. Patients were randomized into two groups. Group 1 received ischemic compression and Group 2 received low-level laser therapy twice a week for 6 weeks. Both groups received the same standard exercise program. Pain, range of motion, pelvic floor symptom severity, quality of life, satisfaction, anxiety, and depression were assessed after 6 weeks, and 1-year follow up. Results Following the treatment, significant differences were observed within both group subjects in pain, range of motion, symptom severity, quality of life, and anxiety-depression (p < 0.05). This significant improvement in pain, symptom severity, symptoms related quality of life and pain subgroup of Short Form 36, continued after 1-year follow up (p < 0.05). In comparison between group, Group 1 have more significant improvement than Group 2 in terms of symptoms related quality of life (p < 0.05). Conclusion Both methods have shown efficacy and can be used safely in chronic pelvic pain patients. Because it is more effective on symptoms related quality of life, the ıschemic compression method may be preferred for primary use.
AtıfScopus1WoS1OpenAlex2İncele - MakaleAçık Erişim2022Scopus SJRQ2Effect of chlorpyrifos on some biochemical changes in Cyprinus carpio: the protective effect of ellagic acid
Mişe Yonar, Serpil; Yonar, Muhammet Enis; Ural, Mevlüt Şener; Pala, Ayşegül
In this study, ameliorative effects of ellagic acid (EA) on oxidative stress induced by chlorpyrifos (CPF) in carp, Cyprinus carpio, were investigated. Fish were divided into six groups: C (no treatment), EA (100 mg kg fish−1), CPF-1 (0.040 mg L−1), CPF-2 (0.080 mg L−1), CPF-1 + EA, and CPF-2 + EA. CPF and EA were applied simultaneously for 14 days and, at the end of the study, liver, kidney, and gill samples were collected from fish. On the taken tissue samples, malondialdehyde (MDA) level and some antioxidant enzyme (superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), and glutathione-S-transferase (GST)) activities were evaluated. The results demonstrated statistically significant increases in the MDA levels of the CPF-1 and CPF-2 groups. On the other hand, the MDA levels were significantly decreased by EA administration. Also, CPF exposure caused statistically significant increases in the SOD and GST activities and statistically significant decreases in the CAT and GPx activities. However, treatment with EA reversed negative alterations in the SOD, CAT, GPx, and GST activities. Therefore, the results of this study results showed that simultaneous treatment with EA alleviates CPF-induced oxidative stress in fish.
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İncele - MakaleYalnız künye2022Scopus SJRQ1Dynamic response model and equivalent solution method of large-diameter buried energy transportation pipeline under moving load
Xu, Qian; Yang, Gang; Li, Zhuorui; Zou, Zhenwei; Zheng, Qiang; Zhong, Liqiong; Chen, Xingli; Akkurt, Nevzat; Du, Yanping; Xiong, Yaxuan
Long-distance energy pipeline pass under roads, subjecting them to repeated stress and posing pipeline safety problems. To simulate the effects of vehicles driving over energy transmission pipeline, this paper examines large-caliber buried pipelines in the suburbs. In this study, a mechanical action model of vehicle-soil-pipeline (VSP) interactions to transform the process of a vehicle driving into the dynamic process of a load changing with time in the specified area was created. The VSP model was used to analyze the influence of moving load and position on the structural characteristics of the pipeline section. An equivalent solution method with high precision and high calculation efficiency was proposed. The results showed that as the loading position approaches the pipeline or the load increases, the stress value at the top of the pipeline gradually exceeded the stress value at the bottom of the pipeline and became the area with the maximum stress value. The minimum stress location also changed from the lower half near the pipeline bottom (Point D-135°) to the upper half near the pipeline top (Point B-45°or Point H-315°). Using the polynomial fitting method, the stress values of the maximum points were equivalently converted. Under the premise of considering pipeline safety, the most suitable functional relationship for the moving load equivalent model was obtained.
AtıfScopus16OpenAlex13İncele - MakaleAçık Erişim2022Scopus SJRQ1Graphene reinforced hybrid-bioceramic coatings on porous-Ti6Al4V for biomedical applications: morphology, corrosion resistance, and cell viability
Aslan, N.; Aksakal, B.; Dikici, B.; Sinirlioglu, Z.A.
The effect of Hydroxyapatite (HA)-based coatings reinforced with reduced graphene oxide (rGO) on porous-Ti6Al4V (P-Ti6Al4V) alloys in terms of electrochemical corrosion and cell viability for potential biomedical applications was investigated in this study. The scaffold-porous surfaces of P-Ti6Al4V were coated by the biocomposite structure of HA and reduced graphene oxide (rGO) at various porosity rates (40, 50, and 60%) by using the sol–gel dip-coating method. The results of 0.5, 1.0, and 1.5 wt% rGO-HA coatings were compared to coatings that contained only HA (free-rGO). Raman spectroscopy, X-ray diffractometer, and scanning electron microscopy were used for structural and morphological characterizations. The coatings in vitro corrosion susceptibilities were tested in simulated body fluid at 37 °C. Compared to free-rGO coatings, the results showed that rGO reinforcements phases reduced the corrosion rate of the scaffolds. The corrosion rate increased as the porosity content of the scaffolds increased. In vitro cell viability tests revealed that samples of 0.5 and 1.0 wt% rGO-HA coating groups performed better than the control and 1.5 wt% rGO-HA samples. Graphical abstract: [Figure not available: see fulltext.]
AtıfScopus8WoS7OpenAlex6İncele - MakaleAçık Erişim2022Characterization and dye adsorption effectiveness of activated carbon synthesized from olive pomace
Deniz, Fatma; Başgöz, Öyküm; Güler, Ömer; Mazmanci, Mehmet Ali
Studies, about products obtained from agricultural wastes, have increased within the scope of zero waste studies. The olive pomace is produced as a result of olive oil production. In the present study, activated carbon was synthesized using the olive pomace taken from the olive pomace processing plant operating with a three-phase process. The synthesized activated carbon characterization was performed using Scanning Electron Microscope (SEM), Fourier-Transform Infrared Spectroscopy (FT-IR), Brunauer – Emmett – Teller (BET), and X-Ray Crystallography (XRD) devices. Olive pomace activated carbon (OPAC) was used for the adsorption of dye from an aqueous solution. The adsorption efficiency of the OPAC was investigated. The initial pH value of dye solution (6–9), the amount of activated carbon (0.5 and 1.0 g/L), and initial dye concentration (600–1200 mg/L) were optimized. Also, adsorption kinetic and isotherm calculations were evaluated. The optimum parameters were found as the original pH value (pH=8) of dye solutions, OPAC amount of 1.0 g/L and the initial concentration of 1000 mg/L. The Langmuir isotherm model and the pseudo-second-order kinetic model were found as the most suitable models. It can be said that the synthesized material can be used at dye removing from wastewater.
AtıfScopus6OpenAlex3
İncele - MakaleAçık Erişim2022Scopus SJRQ2Assessment of heavy metal accumulations and health risk potentials in tomatoes grown in the discharge area of a municipal wastewater treatment plant
Arslan Topal, E. Işıl; Topal, Murat; Öbek, Erdal
Some heavy metals were detected in organs of the tomatoes grown in the discharge area of effluents of a municipal wastewater treatment plant. Also, the health risk potentials of heavy metals in the tomatoes consumed by human were investigated. The highest concentrations for Cu, Ni, Cr, Mn and Pb were followed the order of root>leaf>stem>fruit. When the bioconcentration factors values calculated for bioconcentration of metals from effluent to stem and root were examined, the highest values were determined for Cu. When translocation factors values are examined, the highest translocation from root to leaf was determined for Cd. The highest translocation from stem to leaf was determined for Pb. The estimated total exposure dose for male, female and children was listed as Zn>Mn>Cu>Cr>Ni>Pb>Cd. In terms of dietary, we can list the non-carcinogenic risks of heavy metals as children> female> male. The highest carcinogenic risk was calculated for Cr via dietary intake.
AtıfScopus17WoS18OpenAlex20İncele - MakaleYalnız künye2022Scopus SJRQ1Experimental and material characterization of composites, including waste iron and marble powder
Gülmez, Nihan
Due to its fine particle size, waste marble slurry originating in cutting and processing units mixes into the air after drying, causing environmental and health problems in nearby areas. On the other hand, large amounts of iron particles are generated as metalworking industry waste, affecting the environmental system. In this study, 0%, 10%, and 20% marble powder (instead of cement) and iron particles (instead of fine aggregate) were used in mixtures, and the composites produced were subjected to two different curing periods: 7 and 28 days. The physical, mechanical, microstructural, and thermal properties of the fresh and hardened composites were ascertained via bulk density, consistency, porosity, water absorption, capillary water absorption, strength tests, particle size distribution, X-ray diffraction (XRF), X-ray fluorescence (XRF), scanning electron microscopy and energy dispersive spectroscopy (SEM–EDS), and thermogravimetric analyses (TGA). The results revealed that minimum water absorption (8.5%) and porosity (19.8%) values were achieved in 28-day composites produced with 10% marble–20% iron wastes among all composites. Thus, iron particles substituted for natural aggregates were mainly responsible for the increase in mechanical performance. A maximum flexural strength of 5.9 MPa and a compressive strength of 26.7 MPa were observed in 28-day composites containing 0% marble–20% iron wastes. Furthermore, capillary water absorption tended to decrease with the substitution of 10% marble powder.
AtıfScopus3WoS2İncele - MakaleYalnız künye2022Scopus SJRQ1Numerical evaluation of the coupled/uncoupled effectiveness of a fluid-solid-thermal multi-field model for a long-distance energy transmission pipeline
Wang, Kang; Xie, Kai; Zhang, Hui; Qiang, Yujie; Du, Yanping; Xiong, Yaxuan; Zou, Zhenwei; Zhang, Mingbao; Zhong, Liqiong; Akkurt, Nevzat
As the main component of energy transmission, long-distance energy transmission pipeline (LETP), whose safety problem is becoming more and more prominent with the development of the oil and gas transportation industry, is susceptible to the traffic loading, temperature loading, pressure loading and other loadings. In this paper, the mechanical characteristics of LETP under the interaction of temperature loading and pressure loading are investigated. Based on the theory of multi-field coupling, the mathematical model of fluid-solid-thermal coupling of fluid-filled pipelines under the combined effect of temperature and pressure loadings is established and verified. Meanwhile, an equivalent model is proposed to accurately calculate the stress of any pipeline segment in LETP. The results show that the coupling of temperature loading and the pressure loading is significantly affected by the end-side constraints of the pipelines. For strong end-side constraint, the coupling effect of temperature and pressure loadings has a significant effect on the calculated equivalent stress. The difference between the stress solution under coupling effect and decoupling effect is above 30 MPa. However, for weak end-side constraints, the error is within 10 MPa. The equivalent stress can be approximated by the decoupling solution instead of the coupling solution.
AtıfScopus15OpenAlex15İncele - MakaleAçık Erişim2022Scopus SJRQ3Decolorization of Remazol Brilliant Violet 5R and Brilliant Green dyes by Hypnum cupressiforme using response surface methodology-central composite design methodology: toxicity assessment studies by Daphnia magna
Korkmaz, Volkan; Erguven, Gokhan Onder; Tanyol, Mehtap; Alatas, Mevlut; Yildirim, Numan
This study is the first report that aims to optimize the removal of Remazol Brilliant Violet 5R (RBV 5R) and Brilliant Green (BG) from synthetic solutions using Hypnum cupressiforme samples from Abant Mountains of Bolu (Turkey) as biosorbent and to conduct toxicity evaluation studies of treated wastewater using Daphnia magna. Optimization was performed using central composite design under response surface methodology with the operational factors of dye concentration, H. cupressiforme dose, and process time. The optimal conditions for dye concentration, H. cupres-siforme dose, and process time obtained by the numerical analysis were 19.02 mg/L, 0.18 g/50 mL and 110.59 min for RBV 5R, while these values were 18.57 mg/L, 0.18 g/50 mL and 99.45 min for BG, respectively. At the optimum values, maximum RBV 5R and BG removal were achieved as 99.39% and 99.22%, respectively. The D. magna mortality rates showed that treatment with adsorption were sufficient to remove the complete toxicity of dyes especially for RBV 5R.
AtıfScopus2WoS2OpenAlex2İncele - MakaleAçık Erişim2022Scopus SJRQ1Evaluation of the mechanical properties and durability of self-compacting alkali-activated mortar made from boron waste and granulated blast furnace slag
Yön, Merve Şahin; Karataş, Mehmet
The production of high-strength alkali-activated mortar and concrete by using waste materials instead of cement in order to reduce the amount of carbon dioxide released to nature in cement production is an important study that attracts the attention of researchers. In this study, self-compacting alkali-activated mortar samples were produced using boron waste (BW) and granulated blast furnace slag (GBFS). Prismatic samples of 40 × 40 × 160 mm and cubes of 50 × 50 × 50 mm were produced, in which 0%, 5%, 10%, 15%, 20%, 25% of BW were used. To achieve self-compacting alkali-activated mortar (SCAAM) slump-flow test method was conducted by per The European Federation of Specialist Construction Chemicals and Concrete Systems (EFNARC) guidelines. The samples prepared using Na2SiO3 (NS)/NaOH (NH) = 3.0 were exposed to oven curing at 60 °C and 100 °C for 3 days. The flexural and compressive strength (CS) values of 3, 28 and 90 days were obtained for the samples whose curing period was completed. According to the mechanical strength results, influence of capillary water absorption, porosity, water absorption and density and freeze-thaw from durability tests were carried out. After experimental tests, Scanning Electron Microscope (SEM) and Energy-dispersive X-ray Spectroscopy (EDS) images were utilized to determine microstructures of the samples. As a result of the study, it was determined that the highest strengths were obtained at the curing temperature of 60 °C. Also, it was seen that mechanical strengths and durability decreased with the increase in the BW ratio in the mixtures.
AtıfScopus31WoS28OpenAlex33İncele - MakaleYalnız künye2022Scopus SJRQ2THE TUNCELI IRON AGE AND HELLENISTIC SURVEY, 2021
Erdoğan, Serkan; Çakirca, Düzgün; Özcan, Gizem NUR
Carried out in the province of Tunceli since 2016, the ‘Tunceli Iron Age and Hellenistic Survey’ project is aimed at the discovery of new sites and acquisition of new data of mostly known archaeological remains that have not yet been researched thoroughly. During the final observation and documentation of the survey project’s 2021 season, two new archaeological sites were identified in the Tunceli region. The new archaeological sites in question are Masumu-Pak Fortress, which has traces of the Iron Age and the Middle Ages, and the Uzunçayır Necropolis, which should be dated to the Late Iron Age-Early Hellenistic Period. In addition, certain previously undescribed characteristics of the Gelin Odaları Necropolis, Aşağı Doluca, Rabat and Sağman Fortress settlements will be discussed in this paper. The article also includes an observation of medieval spolia artifacts used in traditional house building in the village of Til near Pertek.
- MakaleYalnız künye2022Scopus SJRQ1A novel prediction model for durability properties of concrete modified with steel fiber and Silica Fume by using Hybridized GRELM
Cemalgil, Selim; Gül, Enes; Onat, Onur; Yılmaz Aruntaş, Hüseyin
The service life performance of conventional and modified concrete subjected to harsh climatic condition environment is directly related to durability properties of concrete like abrasion, freezing and thawing cycles. These properties are critical issues that should be predicted before performing experimental test. On this basis, the basic purpose of this paper is to predict the abrasion loss, freezing and thawing properties of concrete modified with silica fume (SF) and steel fiber (SFb) by using mix design and additional properties. From this point of view, a conducted experimental study was selected as a case study. In the control concrete (CC) mixtures, Portland cement, crushed stone aggregate, and superplasticizer (SP) were used in the selected experimental study. SP in concrete mixtures was used in the amounts of 1.0%, 1.5%, and 2.0% by weight of cement, and so modified concrete was produced with and without SFb according to the target strength of C25. Furthermore, SF and SFb were used in different amounts to modify the concrete. The SF was replaced with cement in the amounts of 7.5%, 10.0%, and 15.0%. In total, 16 different mix designs were prepared with different SP and SF ratios. In addition, SFb was added to all mixtures of designed concrete at a constant amount of 65 kg/m3. Additionally, a 16-mix design was prepared with SFb. Cumulatively, 32 different mix designs were prepared for the experimental study. Tests on the fresh, hardened, and life-cycle performance properties of the concrete were conducted. As for the metaheuristic part of this study, on the basis of the available experimental data, life-cycle performance parameters of the concrete modified with SF and SFb are predicted by using single and hybrid generalized extreme learning machine methods. Eight different data sets were generated with gradually extended input data. Two different outputs were considered: abrasion resistance (AL) and freezing/thawing (FT). Particle Swarm Optimization (PSO) and Grey Wolf Optimization (GWO) algorithms were used to produce binary and ternary hybrid methods. Four different models were proposed as listed: single use of Generalized Extreme Learning Machine (GRELM), binary use of GRELM-PSO, and GRELM-GWO. Finally, PSO and GWO were hybridized and integrated into GRELM. Two quality indicators, namely Root Mean Square Error (RMSE) and correlation of determination (R2), were considered to see the performance of the prediction. The results showed that the proposed ternary prediction model composed of GRELM-PSO-GWO provided more accurate results in all sets from 74% to 91% by extending input parameters, even if complicated parameters are inserted in as an input to the data set.
AtıfScopus28WoS22OpenAlex25İncele - MakaleAçık Erişim2022Scopus SJRQ1Preliminary assessment of health risks associated with consumption of grapevines contaminated with mining effluents in Turkey: Persistent trace elements and critical raw materials
Topal, Murat; Arslan Topal, E.Işıl; Öbek, Erdal
In this study, some persistent trace elements and critical raw materials were investigated in grapevines contaminated with Pb–Zn mining effluents. The persistent trace elements under certain conditions remain without any change in form in the environment over long periods. The critical raw materials are the ones that have economic importance and have the risks associated with their supply. The health risks of persistent trace elements and critical raw materials in the leaves of grapevine that are consumed by humans were determined. The highest persistent trace elements concentrations followed the order of root > stem > leaf for Mn, Cu, Cd, Ni, and Cr while root > leaf > stem for Zn and leaf > root > stem for Pb. The maximum critical raw material concentrations for Co and V followed the order of root > stem > leaf. For Sb and La, these were leaf > root > stem and root > stem > leaf, respectively. The maximum critical raw materials concentrations for W was leaf > stem = root. The total maximum carcinogenic value was 0.146 for Cd while the total minimum carcinogenic value was 0.0054 for Pb. In this study, potential carcinogenic risk values in terms of ingestion of contaminated soil (Cr, Cd, and Ni) and dietary take of grapevine leaves (Ni, Cr, Cd, and Pb) are higher than acceptable levels (1 × 10−4 – 1 × 10−6). Maximum cancer risk on human health was determined as dietary intake of grapevine leaves. When hazard quotient for dietary (HQdie), hazard quotient for ingestion (HQing), and hazard quotient for inhalation (HQinh) values of critical raw materials were examined, the maximum values were observed for children. Also, the highest hazard quotient for dermal (HQder) value was determined for men. The hazard index and total hazard index values were >1 for critical raw materials. As a result, values >1 indicated potential non-carcinogenic human health risk associated with the consumption of grapevines contaminated with mining effluents. Actual region-specific exposure estimates for consumption of grapevines, however, were not evaluated. Integr Environ Assess Manag 2022;18:517–527.
AtıfScopus2WoS2OpenAlex3İncele - MakaleYalnız künye2022Scopus SJRQ2Eco-Friendly, Thermal Resistant Cotton Fabric Enhanced with Nano Zinc Borate Powder
İpek, Yeliz
The easy burning of cotton fabrics, which have the widest usage area among natural fibers, is a serious problem. Thus, treatment with an environmental friend flame retardant material is essential for cotton fabrics. Zinc borates are multifunctional fire retardants. They can act as smoke suppressor, flame retardant and spark suppressor. Since they are non-toxic and environmental friend materials, they are ideal flame retardants for fabric treatment. In this study, nano-sized zinc borate (ZnO·3B2O3·7H2O) was synthesized and cotton fabric was treated with zinc borate powder with a novel method. Zinc borates are slightly soluble in water. They were dissolved with aid of ammonia as zinc ammonia borate complexes and were recrystalised on the cotton fabric fibers through the evaporation of ammonia. The burning resistance of treated cotton fabric was investigated. The hardness, hydrophobicity, smoke suppression and burning resistance of untreated and treated cotton fabrics were compared. Since zinc borates have smoke suppression feature, a more slight smoke was observed and a higher rate of carbonization occurred during combustion test of treated cotton fabric compared to the untreated cotton fabric. In addition, the burning rate was reduced from 2.26 cm/s to 1.26 cm/s.
AtıfScopus4WoS3OpenAlex4İncele - MakaleAçık Erişim2022Scopus SJRQ2Effect of Cu, Sn and Sb addition on the structural, thermal and magnetic properties of body-centered cubic structured CoNiMnGaSi high entropy alloy
Şimşek, Telem; Özkul, İskender; Canbay, Canan Aksu; Avar, Barış; Şimşek, Tuncay; Güler, Seval Hale; Özcan, Sadan; Güler, Ömer; Chattopadhyay, Arun K.
In this study structural, morphological, thermal and magnetic properties of equiatomic CoNiMnGaSi (base), CoNiMnGaSiCu, CoNiMnGaSiSn and CoNiMnGaSiSb alloys are discussed. The formation of solid-solution nanocrystalline bcc structure of the alloys was determined by XRD and DTA techniques. SEM–EDS analyses also revealed the homogeneous distribution of the elements. The room temperature magnetic hysteresis loops showed that as-casted alloys reached saturation easily with coercivity less than or equal to 35 Oe. As the Cu and Sn were added to the alloy, the saturation magnetization was decreased from 112 emu/g to 50 emu/g, which was mainly due to the substitution of non-magnetic atoms to the magnetic Co in the base CoNiMnGaSi alloy, whereas the addition of Sb to the base alloy did not have a significant effect on the Ms. The CoNiMnGaSiSb was found to have the highest Curie Temperature of 670 K, which makes the alloy a promising candidate for power industry-related applications.
AtıfScopus3OpenAlex4İncele - MakaleAçık Erişim2022Scopus SJRQ3A New Rail Surface Defects Detection Approach Using 3D Laser Cameras Based on ResNet50
Santur, Yunus; Yilmazer, Merve; Karakose, Mehmet; Akin, Erhan
Rail transportation systems, which are used as one of the most common means of transportation worldwide, should be regularly inspected to prevent accidents that may occur. The rail condition monitoring can be performed in high accuracy and real time using computer vision, deep learning algorithms today. In this study, a new deep learning based approach using 3D laser cameras for rail inspection is presented. In the proposed approach, two 3D laser cameras placed on a real train, seeing the rail line from the left and right surfaces were used. These data consisting of sensitive distance value constitute the input data of the ResNet50 transfer learning model. The training was carried out on Nvidia Cuda supported graphics processing units using ResNet50 Convolutional Neural Network. During the test phase, the operation speed and accuracy rate of the method was measured by repeating the process on real-time rail profiles. The accuracy rate was calculated as 94%. As a result a new approach is presented based on deep learning using 3D laser cameras for rail inspection is presented.
AtıfScopus12WoS8OpenAlex9İncele - MakaleAçık Erişim2022Scopus SJRQ2Temperature-Dependent Density and Magnetohydrodynamic Effects on Mixed Convective Heat Transfer along Magnetized Heated Plate in Thermally Stratified Medium Using Keller Box Simulation
Ullah, Zia; Akkurt, Nevzat; Alrihieli, Haifaa F.; Eldin, Sayed M.; Alqahtani, Aisha M.; Hussanan, Abid; Ashraf, Muhammad; Jabeen, Mah
The heat transmission properties along the non-magnetized geometries have been numerically obtainedby various researchers. These mechanisms are less interesting in engineering and industrial processes because of excessive heating. According to current studies, the surface is magnetized and the fluid is electrically conductive, which helps to lessen excessive surface heating. The main objective of the current analysis is to numerically compute the temperature-dependent density effect on magnetohydrodynamic convective heat-transfer phenomena of electrical-conductive fluid flow along the vertical magnetized and heated plate placed in a thermally stratified medium. For the purpose of numerical analysis, the theoretical process governing heat and magnetic intensity along a vertical magnetic plate is examined. By using suitable and well-known similarity transformations for integration, the non-linear coupled PDEs for the aforementioned electrical-conductive fluid flow mechanism are changed and subsequently converted into non-similar formulation. The Keller Box method is used to numerically integrate the final non-similar equations. The MATLAB software program plots the transformed algebraic equations graphically and quantitatively. The behavior of the physical quantities such asvelocity graph, magnetic field graph, and temperature plot along with their slopes that arerate of skin friction, the rate of heat transfer, and the rate of magnetic intensity for different parameters included in the flow model. The novelty of the current work is to compute the magneto-thermo analysis of electrically conducting flow along the vertical symmetric heated plate. First, we secure the numerical solution for steady part and then these results are used to find skin friction, heat transfer, and magnetic intensity. In the current work, the fluid becomes electrically conducing due to a magnetized surface which insulates heat during the mechanism and reduces the excessive heating. The results are excellent and accurate because they are satisfied by its given boundary conditions. Additionally, the current problems have a big impact on the production of polymer materials, glass fiber, petroleum, plastic films, polymer sheets, heat exchangers, catalytic reactors, and electronic devices.
AtıfScopus20OpenAlex18İncele - MakaleAçık Erişim2022Scopus SJRQ2A New Hybrid Fuzzy Multi-Criteria Decision Methodology for Prioritizing the Antivirus Mask over COVID-19 Pandemic
Kaya, Sema Kayapinar; Pamucar, Dragan; Aycin, Ejder
During the COVID-19 pandemic, masks have become essential items for all people to protect themselves from the virus. Because of considering multiple factors when selecting an antivirus mask, the decision-making process has become more complicated. This paper proposes an integrated approach that uses F-BWM-RAFSI methods for antivirus mask selection process with respect to the COVID-19 pandemic. Finally, sensitivity analysis was demonstrated by evaluating the effects of changing the weight coefficients of the criterion on the ranking results, simulating changes in Heronian operator parameters, and comparing the obtained solution to other MCDM approaches to ensure its robustness.
AtıfScopus21WoS15OpenAlex23İncele