Yazarlar
- Tozlu, Alperen(15)
- Kul, Sinan(13)
- Kutlu, Naciye(12)
- Cuce, Erdem(8)
- Cuce, Pinar Mert(8)
- Uçurum, Metin(8)
- Gökçe, H.S.(7)
- Kamiloğlu, Aybike(7)
- Özahi, Emrah(6)
- Şahin, Engin(6)
- Ayata, Ümit(5)
- Ecem Bayram, Nesrin(5)
- Ekmekyapar Torun, Fatma(5)
- Guclu, Tamer(5)
- Gökçe, H. Süleyman(5)
- Serencam, Huseyin(5)
- Yilmaz, Fatih(5)
- Özdemir, Akın(5)
- Bayram, Sinan(4)
- Cengiz, Ibrahim(4)
- Elbir Abca, Tuğba(4)
- Gerçek, Yusuf Can(4)
- Gökçe, H. S.(4)
- Karbancioglu-Guler, Funda(4)
- Mercan, Emin(4)
- Serencam, Hüseyin(4)
- Sert, Durmuş(4)
- Teke, Çağatay(4)
- Torun, Fatma Ekmekyapar(4)
- Tozlu, A.(4)
- İrdemez, Şahset(4)
- Abusoglu, Aysegul(3)
- Abuşoğlu, Ayşegül(3)
- Baştürk, Fatma Nur(3)
- Bingül, Züleyha(3)
- Can, Zehra(3)
- Duran, Celal(3)
- Kamiloğlu, Hakan Alper(3)
- Karakaş, İbrahim Hakkı(3)
- Kırkıncı, Seran(3)
Yayınlar
- MakaleAçık Erişim2024Scopus SJRQ2Optimization of a Novel–Enriched Pasta Production and Its Physical, Chemical, and Characteristic Properties
Yilmaz, Merve Silanur; Kutlu, Naciye; Sakiyan, Ozge; Isci, Asli
The aim of the study is to enrich pasta with cornelian cherry powder, a product with high bioactive contents. In this way, it was aimed to obtain a new product that is more nutritionally advanced and can contribute to the country’s economy. In this study, cornelian cherry with high bioactive content and an attractive color advantage was used for the enrichment of the pasta formulation. In addition, the pasta production procedure was revised by applying microwave technology for drying. Cornelian cherry powder:dough ratio, dough thickness, and microwave power were optimized with response surface methodology. Total phenolic content, antioxidant activity, color, and water-holding capacity were determined as responses. Optimum conditions were found as 4.53% for powder:dough ratio, 0.1 cm for dough thickness, and 270 W for microwave power. According to optimization results, it was detected that the cornelian cherry powder:dough ratio affected the total phenolic content and antioxidant activity, and microwave power was found to be effective only on antioxidant activity. For optimum conditions, the total phenolic content and antioxidant activity were found as 1.29 GAE/g and 0.5 mg TE/g, respectively. The characterization analysis showed that the microwave–dried sample shrank less than those dried with the conventional method. In Fourier transform infrared spectroscopy (FTIR) results, it was determined that the amount of carbohydrates in the samples obtained under optimum conditions was lower than that of control. It has been observed that the application of microwave technology for drying pasta enriched with cornelian cherry powder had positive effects on the quality of the final product.
AtıfScopus2WoS2OpenAlex2
İncele - MakaleAçık Erişim2024Scopus SJRQ2Green synthesis of (S)-1-(furan-2-yl)propan-1-ol from asymmetric bioreduction of 1-(furan-2-yl)propan-1-one using whole-cell of Lactobacillus paracasei BD101
Bülbül, Ali Savaş; Şahin, Engin
Chiral heterocyclic alcohols are important precursors for production of pharmaceutical medicines and natural products. (S)-1-(furan-2-yl)propan-1-ol ((S)-2) can be used production of pyranone, which can be used in the synthesis of sugar analogues, antibiotics, tirantamycines, and anticancer drugs. The synthetic approaches for (S)-2, however, have substantial difficulties in terms of inadequate enantiomeric excess (ee) and gram scale synthesis. Moreover, the biocatalytic synthesis of (S)-2 is unknown until now. In this study, the synthesis of (S)-2 was carried out by performing the asymmetric bioreduction of 1-(furan-2-yl)propan-1-one (1) using the Lactobacillus paracasei BD101 biocatalyst obtained from boza, a grain-based fermented beverage. (S)-2 was obtained with >99% conversion, >99% ee, and 96% yield under the optimized conditions. Furthermore, in 50 h, 8.37 g of 1 was entirely transformed into (S)-2 on gram scale (96% isolated yield, 8.11 g). This is the first report on the high-gram scale biocatalyzed synthesis of enantiopure (S)-2. These data suggest that L. paracasei BD101 can be used to bioreduction of 1 in gram scale and efficiently produce (S)-2. Furthermore, these findings laid the base for future study into the biocatalytic production of (S)-2. It was particularly notable as it was the highest known to date optical purity of (S)-2 generated by asymmetric reduction using a biocatalyst. This work offers a productive environmentally friendly method for producing (S)-2 using biocatalysts.
AtıfScopus10WoS10OpenAlex12
İncele - MakaleAçık Erişim2024Scopus SJRQ2Optimization of pectin extraction from crab apple peel and usage in a model meat emulsion system
Aldemir, Hazal; Kamiloğlu, Aybike; Çakır, Özlem
The aim of this study was to optimize conditions of microwave-assisted pectin extraction from crab apple peels using the Box–Behnken experimental design. For this purpose, microwave-assisted pectin extraction was performed at different extraction time (3, 6, and 9 min), liquid/solid ratio (75, 100, and 125), and pH (1.5, 2.0, 2.5). The optimum conditions were selected as extraction time (7.77 min), liquid/solid ratio (77.53 mL/g), and pH/1.79). The response, obtained under optimum conditions was determined as 0.1128 ± 0.0137 g pectin/g crab apple peel. In addition, it was determined that the obtained pectin sample had an esterification degree of 79.14% and oil and water binding capacities of 8.5 ± 0.7 g oil/g pectin and 8.1 ± 1.5 g water/g pectin, respectively. It was determined that pectin emulsions showed higher stability at 1% pectin level. The possibilities of using pectin obtained under optimized conditions as a fat replacer in a model sausage system were investigated. Pectin was evaluated in the model sausage system at two different concentrations. With the increasing pectin concentration, the cooking loss value increased from 14 to 18%, while leakage decreased from 0.31% to 0.18%, showing a negative effect on cooking loss and a positive impact on the amount of leakage into the packaging. Pectin obtained from crab apple peel has the potential to be used for reducing fat content in sausage environment.
AtıfScopus15WoS12OpenAlex14İncele - MakaleAçık Erişim2024Scopus SJRQ1Production of high strength and colored concrete using textile waste reactive dyestuffs as superplasticizers
Erdem, Emin; Aydın, Gülsüm Merve; Kılınçarslan, Rafet
Herein, we are reporting the effect of reactive dyestuffs, currently widely used in textile industry, on the hydration of Portland cement and their usability as water-reducing additives. For this purpose, solutions containing various ratios (0,005- 0,016 g/100 ml tap water) dyestuffs as superplasticizers were used as mixing water for cements. The effects of these dyes on the hydration of Portland cement were determined by physical tests and DSC-TG-DTG, FT-IR and X-ray diffraction techniques. It was found that the dyestuff added to the cement reduced the cement water/cement ratio (2–7%) and increased the compressive strength (8–13%), depending on the molecular size and structure, and it was also determined that it had no negative effect on cement hydration.
AtıfScopus4WoS4OpenAlex5İncele - MakaleYayıncıda açık erişim2024Scopus SJRQ1Energy, exergy, environmental, and enviroeconomic (4E) analysis of cascade vapor compression refrigeration systems using nanorefrigerants
Yılmaz, Metin; Cimşit, Canan; Keven, Arzu; Karaali, Rabi
The refrigerants used in traditional vapor compression refrigeration systems are harmful to the ozone layer and contribute to global warming. The demand for refrigeration is increasing because of global warming. In this study, for the first time, an energy, exergy, environmental, and enviroeconomic (4E) analysis was performed using different refrigerants and nanoparticles to reduce the energy required in low-temperature vapor compression cascade refrigeration systems and to determine more environmentally friendly nanorefrigerants. The R290 refrigerant was used for the Low-Temperature Circuit (LTC), while the High-Temperature Circuit (HTC) used RE170, R1234yf, R600, R600a, and R450A refrigerants. The nanoparticles used in the analysis were Al2O3, CNT, CuO, TiO2, ZnO, and SiO2. The R600 nanorefrigerant performed the best, whereas the R1234yf nanorefrigerant performed the worst. The results indicate that the CuO nanoparticles provided the highest performance. In addition, the results showed that the R290+R600-CuO nanorefrigerant emitted 11 % less CO2 than the pure R290+R600 refrigerant. The nanorefrigerants provide a more environmentally sustainable option because of their high efficiency and lower energy consumption than conventional refrigerants.
AtıfScopus9WoS7OpenAlex8İncele - MakaleAçık Erişim2024Scopus SJRQ3Green Synthesis of Selenium Nanoparticles using Green Coffee Beans: An Optimization Study
Baluken, Pınar; Kamiloglu, Aybike; Kutlu, Naciye
In this study, ultrasonication extraction of some bioactive compounds from green coffee beans was optimized with the response surface method using Box-Behnken experimental design. The best condition was selected as 90.90 W ultrasonic power, 33.63 min sonication time and 30 % solid concentration. The responses obtained under optimum conditions had TPC, DPPH and CUPRAC values identified as 6603.33±2025.94 ppm GAE, 9638.31±372.17 ppm TE and 98.83 mmol, respectively. Microwave-assisted selenium nanoparticle production was carried out using the extract obtained under optimized conditions. The produced selenium nanoparticles showed absorbance between 350–400 nm. The surface morphology and size of the nanoparticles were determined by transmission electron microscopy (TEM) and spherical nanoparticles of about 100 nm were produced. Functional groups affecting the reduction were determined by FTIR analysis. In addition, the produced selenium nanoparticles had amorphous (non-uniform) structure and could maintain their stability at high temperatures.
AtıfScopus5WoS5OpenAlex5İncele - Derleme MakaleAçık Erişim2024Scopus SJRQ1Oxidative stability, quality, and bioactive compounds of oils obtained by ultrasound and microwave-assisted oil extraction
Walayat, Noman; Yurdunuseven-Yıldız, Aysun; Kumar, Manoj; Goksen, Gulden; Öztekin, Sebahat; Lorenzo, José Manuel
Vegetable oils are extracted from oilseeds, fruits and other parts of plants. The method used in oil extraction is of great importance, as it affects both the quality of the final product and the environment. It is desirable that the extraction method be minimally costly, fast, environmentally friendly, and produce oil of high quality and quantity. Common oil extraction methods are mechanical pressing and solvent extraction, and these methods have advantages and disadvantages over each other. Mechanical extraction and solvent extraction are controversial due to poor product quality and high environmental impacts. This review presents applications where conventional oil extraction processes are assisted by microwave or ultrasound. It is necessary to evaluate the impact of ultrasound and microwave-assisted extraction on the quality of the extracted oil and also to compare the results with those of conventional extraction methods. For this purpose, this review discusses the effects of microwave and ultrasound-assisted extraction on the physicochemical, oxidation indices, bioactive compounds, and antioxidant properties of oil extracted from oil seeds and fruits. Furthermore, this review provides readers with in-depth information on the mechanisms involved, their use, and the impact of operating conditions. The yield and quality of the oil obtained by these processes can vary depending on parameters such as microwave power, ultrasound power, processing time, and temperature. Finally, the review also discusses the challenges and advantages of the industrial application of these technologies.
AtıfScopus47WoS41OpenAlex45İncele - MakaleAçık Erişim2024Scopus SJRQ1Analysis of cascade vapor compression refrigeration system using nanorefrigerants: Energy, exergy, and environmental (3E)
Yilmaz, Metin; Cimsit, Canan; Keven, Arzu; Karaali, Rabi
Nanorefrigerants are considered the most efficient heat transfer fluids for improving heat transfer properties in the refrigeration and air conditioning equipment. For the first time in this study, energy, exergy, and environmental evaluation (3E) analyses were performed by the addition of different nanoparticles to a low GWP refrigerant pair such as R290/R1233ZDE in a cascade refrigeration system. CNT, CuO, and, TiO2 nanoparticles were added to the refrigerant. The effect of nanoparticles on the cascade refrigeration system was analyzed using a model based on density changes. A detailed thermodynamic analysis was performed of the cascade refrigeration system at different evaporator temperatures and mass ratios. The power consumption of the compressor decreases as the evaporator temperature increases for all types of nanoparticles, resulting in an increase in COP values. The analyses showed that CuO nanoparticles had the highest performance. It has been observed that the energy and exergy efficiency increase as compressor work decreases with increasing mass ratios in all nanorefrigerants. In addition, the results indicated that all nanorefrigerants emit lower monthly CO2 emissions compared to the pure refrigerants. The nanorefrigerants play a crucial role in reducing energy consumption and promoting environmental protection compared to traditional refrigerants.
AtıfScopus16WoS16OpenAlex17İncele - MakaleYalnız künye2024Scopus SJRQ3Microwave hydrodistillation of Pelargonium graveolens L’Her leaves: Essential oil profile, phytochemical composition of wastewater, histo-anatomical structure
Boztaş, Kadir; Gercek, Yusuf Can; Türer, Gizem; Canlı, Deniz; Bayram, Sinan; Çelik, Saffet; Kırkıncı, Seran; Basturk, Fatma Nur; Feizollahi, Sepideh; Cevahir Öz, Gül
By-products with remarkable bioactive properties are formed in extraction processes of essential oils from plant materials. In present study, it was aimed to determine the concentration of individual phenolic and organic acid compounds by LC-MS/MS of the by-product (wastewater) collected after the essential oil isolation from Pelargonium graveolens L. and to determine some bioactive properties of this by-product. In addition, the chemical analysis and antibacterial activity of the essential oil extracted from P. graveolens were determined and the histo-anatomical characterization of the glandular trichomes in the leaf sample was performed. As a result, quercetin (95862.22 μg/kg), myricetin (59834.32 μg/kg) and rutin (36522.90 μg/kg) were the phenolic compounds determined in the highest concentrations in the by-product extracted using two different extraction techniques (non-hydrolysis and hydrolysis methods). Moreover, the individual organic acids of the by-product screened in LC-MS/MS was found to be 4487.17 mg/kg in total. When the essential oil component profile of the plant sample was examined, the citronellol (38.78%) compound was found to be dominant, and it was also detected that the essential oil had remarkable bioactive properties. In conclusion, it can be stated that both the essential oil obtained from P. graveolens and the by-product obtained during essential oil isolation can be considered as a source of some bioactive components in many different industrial applications.
AtıfScopus6WoS4OpenAlex6İncele - MakaleAçık Erişim2024Scopus SJRQ1Recruiting grape-isolated antagonistic yeasts for the sustainable bio-management of Botrytis cinerea on grapes
Oztekin, Sebahat; Karbancioglu-Guler, Funda
Botrytis cinerea is the causative agent of grey mould disease in grapes, which was linked to significant postharvest losses. This study examined three grape-isolated yeasts (Metschnikowia aff. fructicola, Metschnikowia pulcherrima, and Hansenispora uvarum) through in vitro and in vivo tests on detached grape berries against grey mould, as well as the elucidation of their possible mechanisms of action. The antifungal mechanism of action of yeasts was determined by the lytic enzyme activity, inhibition of spore germination, biofilm activity, iron depletion, diffusible metabolites, wound-site colonisation, mycocin, and volatile organic compounds (VOCs) production. The highest in vitro efficacy (83.13%) was observed on M. aff. fructicola, followed by M. pulcherrima (82.10%) and H. uvarum (71.66%). Metschnikowia yeasts exhibited comparable enzyme activities, including protease, β-1,3 glucanase, gelatinase chitinase, and cellulase, while H. uvarum had a poor enzymatic activity with chitinase and gelatinase. M. aff. fructicola showed relatively higher iron depletion activity than M. pulcherrima, while M. pulcherrima outperformed via diffusible metabolites. All yeast cultures significantly reduced spore germination by at least 86%. Overall, M. aff. fructicola exhibited the highest biocontrol activity with its iron depletion, inhibition of conidial germination, biofilm formation, VOCs, and well colonisation on grape berries. M. aff. fructicola 1-UDM outperformed all other yeasts by significantly reducing disease incidence and lesion diameter values (93.4% and 94.3%, respectively). Remarkably, H. uvarum VOCs demonstrated potential as a biofumigant for suppressing grey mould. All yeasts are well adapted to their ecological niche to bio-protect grapes from grey mould disease.
AtıfScopus15WoS11OpenAlex12İncele - MakaleAçık Erişim2024Scopus SJRQ2Effects of Recycled Asphalt Material and Natural Pozzolan as Additives of Hot-Mix Asphalt: A Field Study
Yilmaz, Bahadır; Şentürk, Mehmet Akif
Using existing resources more efficiently and effectively becomes important currently. The question of how to make the best use of resources arises in the choice between constructing new roads and improving deteriorated existing roads. It is also important to reduce the amount of consumption and cost of materials. This has emerged the need to use waste materials by recycling and reusing. In this study, a new hot-mix asphalt (HMA) mixture was developed using recycled asphalt pavement (RAP), which was obtained by excavating the surface of a road at the end of its service life, together with a waste material namely natural pozzolan (NP). The final obtained mixture was used as a wear layer on an active highway. Core specimens were extracted from the paved layer for one year and subjected to dynamic and mechanical laboratory tests. Adding NP improved the resistance of the HMA mixture under heavy seasonal effects and traffic loads. In addition, NP increased the tensile strength, making the HMA mixture more resistant to deformation than control and RAP HMA mixtures. Dynamic creep test results showed that the control asphalt mixture had the most deformation and that the RAP mixture with NP had the least. According to the laboratory results, NP addition increased the stability value of the control mixture by 40%. Especially in cold seasons, the role of NP was more evident. In the performance tests that were applied on core samples taken from the field, ITS values for September increased by 98%, and the deformation values obtained as a result of the dynamic creep test decreased by 12%. In summary, adding NP to RAP HMA improves the performance of the pavement and the cost-effectiveness of the environmentally friendly use of RAP in HMA.
AtıfScopus1WoS1OpenAlex1İncele - MakaleAçık Erişim2023Tüketici Tercih ve Davranışlarında İyi Tarım Uygulamalarına Yönelik Bir Araştırma: Karaman İli Örneği
Göktaş, Bora; Tarakçı, İnci Erdoğan; Oflaz, Özkan
Amaç – Organik Tarım ürünlerinin birim maliyetinin yüksek olması, konvansiyonel ürünlerin ise, kimyasal kalıntılar barındırması nedeniyle insan sağlığına, çevreye (toprak, su vb.) ve doğadaki diğer yaşam paydaşlarına (hayvanlar, bitkiler vb.) zararlı olması tüketicileri iyi tarım uygulamaları ürünlerine yöneltmiştir. İyi Tarım Uygulamalarına (İTU) yönelik tüketici tutumlarını “İnsan Sağlığı”, “Çevreye Faydası” ve “Satın Alma” boyutu bakımından incelemek ve istatistiksel sınamalar yaparak bulguları ortaya koymaktır. Yöntem – Araştırmanın popülasyonu, Karaman ilinde gıda ürünleri alışverişleri yapan hane halkları arasından, kolayda örnekleme yöntemi ile seçilmiştir. Nicel araştırma modeli benimsenerek yürütülen bu çalışmada veri toplama aracı olarak anket kullanılmıştır. Ankette demografik sorular, tüketici tutum ölçeği ve marka kişiliği ölçeğinden yararlanılmıştır. Elde edilen veriler, SPSS-25 istatistik programı kullanılarak analiz edilmiştir. Ayrıca bu veriler ile tek yönlü varyans (Anova) testi, T-testi, Korelasyon analizi yapılmıştır. Bulgular – Araştırma sonucunda ortaya çıkan bulgulara göre; İTÜ’nin insan sağlığına ve çevreye faydalıdır algısı gibi boyutların tüketicilerin tutum ve davranışlarına etki ettiği anlaşılmıştır. Ayrıca bu boyutlar arasında tüketicilerin demografik özelliklerine dair istatistiksel olarak anlamlı farklılıklar elde edilmiştir. Tartışma – Tüketicilerin sağlık ve çevre bilincine bağlı olarak tarımsal gıda ürünlerini satın alma noktasında tutum ve davranışlarının değiştiği görülmektedir. Bireylerin satın aldıkları gıdaların insan sağlığına olumsuz etkileri ve çevreye verdikleri zararı hakkında bilgisi arttıkça insan sağlığına ve çevreye daha duyarlı hale geldikleri görülmüştür.
- MakaleAçık Erişim2023Karanlık üçlü kişilik özelliklerinin sürdürülebilir tüketim davranışına etkisi
Sunaoglu, Serife Kazanci; Özdemir, Neslişah
Sürdürülebilir kalkınmanın sağlanmasında tüketicilerin topluma ve çevreye karşı duyarlı bir tüketim davranışı sergilemeleri oldukça önemlidir. Bu noktada, tüketicileri sürdürülebilir tüketime yönlendiren ya da sürdürülebilir tüketimi baskılayan faktörlerin tespit edilmesi gerekmektedir. Bu kapsamda bu araştırmada, karanlık üçlü kişilik özelliklerinin sürdürülebilir tüketim davranışına etkisinin incelenmesi amaçlanmaktadır. Karanlık üçlü; narsisizm, makyavelizm ve psikopati olarak üç boyutta incelenmektedir. Sürdürülebilir tüketim davranışı; çevreye duyarlılık, tasarruf, ihtiyaç dışı tüketim ve yeniden kullanılabilirlik olarak dört boyut kapsamında ele alınmaktadır. Araştırmanın verisi 307 tüketiciden çevrimiçi anket tekniğiyle toplanmıştır. Gerçekleştirilen doğrulayıcı faktör analizi neticesinde, makyavelizm ve psikopati boyutları birleştirilerek tek bir kişilik özelliği olarak değerlendirilmiştir. Ayrıca, sürdürülebilir tüketim davranışının yeniden kullanılabilirlik boyutu faktör analizi neticesinde analiz dışı bırakılmıştır. Yapısal eşitlik modeli kullanılarak gerçekleştirilen analizler sonucunda narsisizmin çevreye duyarlılık, tasarruf ve ihtiyaç dışı tüketim üzerinde anlamlı bir etkisinin olmadığı tespit edilmiştir. Makyavelizm-psikopati özelliği çevreye duyarlılık, tasarruf ve ihtiyaç dışı tüketim boyutlarını olumsuz yönde etkilemektedir. Araştırmanın sürdürülebilir tüketim davranışını açıklamada kişiliğin karanlık yönlerine odaklanması yönüyle literatüre katkı sağlayacağı düşünülmektedir.
AtıfOpenAlex5TR Dizin5
İncele - MakaleAçık Erişim2023Combination of Conventional Ball Mill and Stirred Mill to Obtain Ultra-Fine Talc
Uçurum, Metin; Güleç, Ömer; Toraman, Oner Yusuf
In this study, it was investigated that talc ore could ground to very fine sizes using a combination of conventional ball mill and vertical stirred mill. Firstly, the conventional ball mill parameters such as mill speed (% of critical speed), material filling ratio (Jb), ball filling ratio (fc), ball size distribution (10-20-30-40 mm, %), grinding aid ratio (% of powder) and grinding time (min.) were optimized using classic experimental design. As a result of the optimization, fine talc product was obtained with d90=93.52 µm particle size. In the second stage, the ball mill product was re-milled using a stirred mill. As a result of study, a final ultra-fine talc powder was obtained after 60 minutes grinding time with d50=1.85 µm particle size and 14058 cm2/g total surface area. It has been seen that the conventional ball mill+stirred mill combination effective a process to obtain talc powder that suitable for industrial use.
- MakaleAçık Erişim2023Covid-19 Pandemisinde Trabzon İli Tıbbi Atık Verilerinin Değerlendirilmesi
Fandaklı, Seda; Ates, Fatih; Atar, Büşra
Nüfusun, şehirleşmenin ve toplumsal refah düzeyinin artışı, teknolojinin gelişmesi, satın alma gücünün artışı, tüketim alışkanlıklarının değişimi, hizmetlerde lüks ve kalite arayışı atık miktarını artırmaktadır. Bu çalışmada, ayrı atık toplama ve azaltma stratejileri ile Trabzon İl Ambulans Servisi ve Toplum Sağlığı Merkezleri'nin atık yönetimini ve bu kurumlardaki atık miktarı ve dağılımına Covid-19'un etkisini incelenmiştir. Covid-19 enfeksiyonunun atık miktarına ve dağılımına etkisini incelemek için ülkemizde Covid-19 enfeksiyonunun ilk görüldüğü 2020 yılı ile önceki ve sonraki yılların verileri karşılaştırılmıştır. Trabzon İli Ambulans Servisinde, ülkemizde ilk Covid-19 vakasının görüldüğü yıl olan 2020 yılında öncesi ve sonrası yıllara göre daha fazla tıbbi atık miktarı (8641 kg) ortaya çıktığı tespit edilmiştir. Toplum Sağlığı Merkezinde ise 2020 yılında oldukça fazla artış gösteren tıbbi atık miktarı, en fazla 2021 yılında (5350 kg) olarak gerçekleşmiştir. Tıbbi atık yönetimi çeşitli riskleri de bünyesinde barındıran maliyetli bir süreçtir. Mevzuata uyumlu atık yönetimi ile riskler engellenebilir ve karşılaşılabilecek iş kazaları da minimize edilebilir. Atık yönetiminin bütün evrelerinde dikkat edilmesi gereken nokta; insan sağlığını, çevre sağlığını ve ekonomiyi olumsuz etkilemeyecek adımların atılmasıdır.
- MakaleAçık Erişim2023Scopus SJRQ2Optimizing and investigating durability performance of sandy soils stabilized with alkali activated waste tuff-fly ash mixtures
Yilmaz, Fatih; Kuvat, Ahmet; Kamiloğlu, Hakan Alper
The search for alternative environmentally-friendly materials to Portland cement is increasing its importance in geotechnical engineering as in other fields. In this study, alkali activated waste volcanic tuff (BT) and fly ash (FA) utilized as an alternative to conventional binders. The specific objectives of this paper were to, (1) optimize fly ash, waste tuff and activator content using Response Surface Methodology (RSM), (2) investigate the UCS performance of the optimum amount of alkali-activated fly ash and waste tuff mixtures as a binder in soil stabilization by comparing with various codes, (3) characterize the optimized parameters, (4) examine durability performances of the samples. Optimum binder and activator content and effect of waste tuff on strength characteristics were evaluated statistically with RSM approach. XRF, XRD, FTIR analyses were performed to verify the synthesized alkali activated material in the inner structures of the optimized samples. The durability and mechanical properties of samples stabilized with alkali activated binders against soaking condition, wetting-drying and were investigated. Destructive and non-destructive methods were employed to examine mechanical and durability characteristics. Unconfined compression strength, strength reduction ratio, soil deterioration, and water absorption capacity was taken into account to evaluate durability performances. UCS values of the stabilized samples were compared with limit UCS values suggested by several standards. As a result of the study it was determined that alkali activated waste tuff and fly ash mixture shows significant mechanical and durability performance in soil stabilization, and capable to use as an alternative to conventional non-green binders.
AtıfScopus6WoS4OpenAlex8İncele - MakaleYayıncıda açık erişim2023Scopus SJRQ4Development of Alkali-Activated Binders from Recycling Regional Tuff and Marble Wastes
Tekin, İlker; Ciza, Baraka; Gökçe, H.S.
The sustainability goals of the developing world have led many industries to recycle their wastes and reduce emitting greenhouse gases. To contribute to these environmental responsibilities, this study has focused on the development of eco-friendly binder materials from regional ground tuff and marble wastes by the activation of sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) or slaked lime (Ca(OH)2). The results of this study show that alkali-activated composites experienced expansion, drying shrinkage cracking, leaching, and efflorescence. The compressive strength values of the NaOH and Ca(OH)2-activated pastes reached up to 15 MPa and 9 MPa, respectively. A reduction in NaOH molarity improved the compressive strength, dimensional stability, and durability of tuff-based alkali-activated pastes.
AtıfScopus5OpenAlex3İncele - MakaleAçık Erişim2023Testing of waste vegetable oils as color modifiers in American walnut (Juglans nigra L.) wood; [Amerikan ceviz (Juglans nigra L.) odununda renk değiştirici olarak bitkisel atık yağların denenmesi]
Peker, Hüseyin; Esteves, Bruno; Ayata, Ümit
American walnut (Juglans nigra L.) wood is used for veneer due to its beautifully grained and dark-colored wood. This study was conducted to test the use of plant waste oils as color modifiers on American walnut wood. As waste vegetable oils, discarded walnut, olive, corn, and sunflower oils were employed. After applying waste oils to the wooden surfaces, several surface properties (brightness, color, and whiteness index: WI*) were determined. It was observed that multivariate analysis of variance tests conducted for WI* values and color parameters were found to be statistically significant. For all vegetable waste oils, decreases were identified in L*, C*, ho, and b* parameters, as well as in WI* values and glossiness values (for all degrees and orientations). The ∆E* values were measured at 19.18 for sunflower, 22.02 for walnut, 22.65 for corn, and 19.49 for olive. Each of the discarded vegetable oils had an impact on the color of the wooden surface. Keywords.
AtıfScopus2OpenAlex2İncele - MakaleAçık Erişim2023Scopus SJRQ1The effect of various industrial dust particles on the performance of photovoltaic panels in Turkey
Güngör, Okan; Kahveci, Hakan; Gökçe, H. Süleyman
The accumulation of dust is one of the main causes of power loss in photovoltaic (PV) farms, and the effect of dust particles’ size and chemistry on system performance is often overlooked. This study has focused on a comprehensive analysis of the effect of different dust particles collected from common industrial production facilities in Turkey on the performance of PV panels in the indoor laboratory environment. The collected dust samples were analyzed to determine the dust sample particles’ chemical properties, size, character, and topography. The data for dust samples at different weights with changes in maximum power point (MPP) of PV panel has been collected using the artificial solar irradiation source system. Thus, the mathematical correlations (R2≥0.965) between the PV panel Thevenin resistance (RTH), fill factor (FF), MPP, and pollution rate were obtained using these collected data and particle swarm optimization (PSO). According to the results of the obtained mathematical correlations, marble dust is 2.3, 3.4, and 4.2 times less polluting than cement, fly ash, and silica fume, respectively. Additionally, it was observed that smaller dust particles block more light than larger ones of the same weight and reduce MPP, FF while increasing the RTH.
AtıfScopus19WoS14OpenAlex21İncele - MakaleAçık Erişim2023Scopus SJRQ1Sustainability Ranking of Turkish Universities with Different Weighting Approaches and the TOPSIS Method
Akyol Özcan, Kübra
The concept of sustainability has become more important, especially as a result of the depletion of energy resources and increasing environmental concerns. UI GreenMetric ranks universities based on sustainability, environmental, and energy concerns, addressing issues of environmental pollution, food and water scarcity, and energy supply. By prioritizing sustainability on their campuses and campuses, universities are working to ensure a more sustainable future for humanity. This study evaluates university sustainability in energy and climate change using the UI GreenMetric ranking, focusing on Turkish universities’ sustainability ranking. It incorporates variables like infrastructure, energy, climate change, waste, water, public transportation, and educational research, using weighting approaches to reveal the most important variables for the country’s universities. The study utilized weighting techniques like CRITIC, entropy, standard deviation-based, and equal weighting approaches to obtain rankings for UI GreenMetric rankings. Entropy and equal weighting methods were found to be closest to the UI GreenMetric rankings. Universities’ rankings were analyzed using the TOPSIS method and four weighting techniques for 83 Turkish universities. For Turkish universities, the CRITIC method yielded the highest weight for energy and climate change variables, while water was identified as the most significant factor for entropy, installation infrastructure, and standard deviation-based weighting techniques.
AtıfScopus13WoS11OpenAlex15İncele
