Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Kutlu, Naciye(4)
- Ecem Bayram, Nesrin(2)
- Kamiloglu, Hakan Alper(2)
- Turan, Huseyin(2)
- Akbaş, Dilek(1)
- Açikyildiz, Metin(1)
- Bayram, Sinan(1)
- Büşra Avlayan(1)
- Dertli, Enes(1)
- Elbir Abca, Tuğba(1)
- Ermis, Ertan(1)
- Gercek, Yusuf Can(1)
- Gerçek, Yusuf Can(1)
- Gücüyener, Alper(1)
- Güneş, Kübra(1)
- Gürses, Ahmet(1)
- Isci, Asli(1)
- Kamiloğlu, Aybike(1)
- Kamiloğlu, Hakan A.(1)
- Kamiloğlu, Hakan Alper(1)
- Kurucu, Kutluhan(1)
- Kutluhan Kurucu(1)
- Kâmiloğlu, Hakan Alper(1)
- Poyraz, Ecem(1)
- Sakiyan, Ozge(1)
- Yilmaz, Fatih(1)
- Yilmaz, Merve Silanur(1)
- Yilmaz, Mustafa Tahsin(1)
- Yilmaz, Özlem(1)
- Çelik, Saffet(1)
- Özkan, Esra(1)
Yayınlar
- MakaleYalnız künye2026Scopus SJRQ2Optimizing microwave drying parameters for rhododendron bee pollen: effects on antioxidant potential, polyphenols, and proteins
Kutlu, Naciye; Gercek, Yusuf Can; Ecem Bayram, Nesrin
Monofloral Rhododendron spp. bee pollen is a remarkable bee product due to its functional components as well as its potential pharmacological effects. In this study, Rhododendron spp. bee pollen was dried by the microwave method as an alternative to the conventional drying method. Different combinations of microwave powers (140, 210 and 280 W) and sample weights (10, 20 and 30 g) applied during microwave drying (MWD) were determined by Central Composite Design. Drying time, total protein, total carotenoid, total phenolic-flavonoid compounds, and proanthocyanidin yields of dried pollen were determined and antioxidant activity tests (CUPRAC and DPPH•) were performed. The analysis results were optimized by response surface methodology (RSM) and the optimum drying conditions were obtained when the microwave power was 280 W and the sample weight was 30 g. The optimal conditions have been established to reduce drying time and enhance the content of bioactive compounds. As a result of optimization, the composite desirability (d) was found to be 0.8. Experimental and predicted values were close to each other. In conclusion, MWD has demonstrated efficacy as a drying technique by significantly reducing drying time while maintaining and enhancing the yields of bioactive compounds in monofloral Rhododendron spp. bee pollen. In comparison to conventional techniques, the application of MWD in the drying process of monofloral Rhododendron spp. bee pollen is demonstrably more efficient and sustainable.
- MakaleAçık Erişim2026Scopus SJRQ3Low-Data Modeling of Shallow Foundations on Cohesive Slopes: A Comparison between Hybrid FEM–RSM and ML Models*
Kâmiloğlu, Hakan Alper; Gücüyener, Alper
In geotechnical engineering, accurately predicting the seismic bearing capacity of shallow foundations on cohesive slopes requires proper consideration of nonlinear effects and parameter interactions. However, most studies in the literature address these complex effects inadequately, either with numerical methods that demand a large number of analyses or with machine learning (ML) models that require large and heterogeneous data sets. In this study, it is aimed to propose an approach that allows for a robust analysis of the system and at the same time provides accurate forecasting for situations where working with small and homogeneous data sets is mandatory. Within the scope of the study, seismic bearing capacity analyses were performed using Plaxis 2D for 273 cases where eight independent variables took different values according to the Face Centered Composite Design (FCCD), and a database was created. Multiple Linear (MLR), Multiple Nonlinear (MNLR) Regression Models were established, and ML models, such as Support Vector Regression (SVR), Random Forest (RF), and Extreme Gradient Boosting (XGBoost), were trained. The models were compared with both in-sample and out-of-sample estimation performance, and parametric sensitivity analyses were evaluated by methods such as ANOVA and SHAP. The results show that the MNLR model with natural logarithmic transformation is the most successful method in terms of both accuracy (R² ≈ 0.98) and reflecting parameter interactions, while the SVR algorithm demonstrates the best generalization ability among ML models under low-data conditions. The results also confirm that the ML models effectively capture the parameter effects.
- MakaleYalnız künye2024Scopus SJRQ1Ultrasound assisted choline chloride-based deep eutectic solvent extraction of bioactive compounds from salsify (Tragopogon buphthalmoides (DC.) boiss. Var. Latifolius Boiss.): A Box–Behnken design approach for optimization
Yilmaz, Özlem; Elbir Abca, Tuğba; Kamiloğlu, Aybike; Kutlu, Naciye
This study aimed to investigate the ultrasound-assisted extraction of bioactive compounds from salsify using deep eutectic solvents (DESs) with different molar ratios. For this reason, total phenolic (TPC), total flavonoid (TFC) compounds, and antioxidant activities (1,1-diphenyl-2-picrilhydrazyl radical scavenging activity (DPPH•), and ferric reducing antioxidant power (FRAP)) of extracts prepared with DES were investigated with an experimental design and optimization study conducted for this purpose. An extraction time of 40.15 min was determined as the optimal condition. Under these conditions, a molar ratio of 3:1 (acetic acid:choline chloride) and a water ratio of 42.17 % provided the highest phenolic/flavonoid compounds and antioxidant activity. Correlations between water ratio, molar ratio, and sonication extraction time were determined using principal component analysis (PCA). In conditions where TPC, FRAP, and DPPH• were high according to PCA, it can be concluded that the extraction time, water ratio, and molar ratio are at high levels; contrarily, TFC is at a low level. In conclusion, ultrasound-assisted extraction using DES proved effective for salsify. Therefore, choline chloride-based DESs, can be recommended as environmentally friendly green solvents and an alternative to organic solvents for the extraction of bioactive compounds from salsify.
AtıfScopus11WoS8OpenAlex10
İncele - MakaleYalnız künye2024Scopus SJRQ2Optimization, Characterization, and Carbon Footprint Analysis of Alkali Activated Waste Tuff and Fly Ash Mixtures for Deep Mixed Columns
Kamiloğlu, Hakan Alper; Yilmaz, Fatih
Deep soil mixing (DSM) applications are one of the widely known soil stabilization techniques which can be applied to a wide range of soil types. Cement and lime are the major materials used as binders for DSM applications. However, as conventional binders lead to emit a large amount of CO2 during production, eco-friendly binders suitable for DSM applications have become prominent. Alkali-activated materials are good alternatives to conventional binders. This study was intended to investigate the usability of zeolite rich tuff wastes as an alkali-activated binder in DSM columns. Within this scope, the waste tuff and C-type fly ash mixture were used as an alkali-activated binder, and 10 M NaOH solution was used as an activator. Response surface methodology (RSM) was employed in experimental design to determine optimum components to obtain maximum unconfined compression strength and investigate the interaction between stabilization agents. From the RSM analysis the optimum ratios of activator (X1), waste tuff (X2), and precursor (X3) were determined as; X1 = 0.251, X2 = 0.548, and X3 = 0.538 for maximum UCS. UCS, mineralogical and microstructural characterization (XRF, XRD, SEM, EDX, FTIR) was performed for the DSM samples prepared considering the optimized components. It was determined that the UCS values of the 3, 7, and 28-day cured samples stabilized by considering the optimum values gave UCS values approximately 3 to 5 times higher than the lower limit values recommended by FHWA. As a result of mineralogical and microstructural investigation, the reason for the strength increase in the samples can be attributed to the formation of geopolymeric gel between the soil particles by tuff waste and fly ash activated with alkaline activator. Carbon footprint analyses were performed for 1m3 DSM columns produced with alkali-activated binders and ordinary Portland cement (OPC). From the analyses it was seen that the carbon footprint of the DSM column produced using alkali activated binders is lower than that of the DSM column obtained with OPC. After the general evaluation of the study, it is seen that the hypothesis that waste tuff can be used as environmentally safe alkali-activated binders instead of traditional binders is supported.
AtıfScopus6OpenAlex6İncele - 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.
AtıfScopus2WoS2OpenAlex2İncele - MakaleAçık Erişim2024Scopus SJRQ2An optimization study for amino acid extraction from bee bread using choline chloride-acetic acid deep eutectic solvent and determination of individual phenolic profile
Kutlu, Naciye; Gerçek, Yusuf Can; Çelik, Saffet; Bayram, Sinan; Ecem Bayram, Nesrin
In this study, the aim was to optimize the extraction conditions (molar ratio, time, temperature) in order to maximize the total individual amino acid (TAA) yield from bee bread, which is a fermented bee product, using choline chloride-acetic acid deep eutectic solvent (DES). In addition to the phenolic profile and amino acid profile investigated by LC-MS/MS, some spectrophotometric (total phenolic content, total flavonoid content, total proanthocyanidin content) and bioactivity (antioxidant/antimicrobial activity) tests were carried out on the extracts. Optimum conditions were determined as 1:2 for molar ratio, 15 min for time and 10 °C for temperature with optimization based on the TAA values of the different extracts (d: 0.99). Molar ratio and temperature were found to have statistically significant effects on TAA values. At optimum conditions, the amount of TAA obtained with DES (29.678 g/kg) was found to be approximately 35.2% and 54.4% higher than that obtained with ethanol and methanol extracts, respectively. All these results indicate that choline chloride-acetic acid DES can be chosen when preparing bee bread extracts, which are evaluated for different areas of use such as food and health due to active ingredient content. Higher active ingredients can be extracted by trying different DES combinations.
AtıfScopus7WoS9OpenAlex11İncele - MakaleAçık Erişim2024Scopus SJRQ2Investigating the Effect of Polypropylene Fiber on Mechanical Features of a Geopolymer-Stabilized Silty Soil
Kamiloğlu, Hakan A.; Kurucu, Kutluhan; Akbaş, Dilek
This study investigates the stabilization of silty soil using alkali-activated fly ash and fibers with lengths of 3 mm and 12 mm. The study examines the effects of hybrid fiber length, fiber content, fly ash content, and activator content on the mechanical properties of the geopolymerstabilized samples. The objectives of this paper are 1) to examine the effect of activator content and fly ash content on the UCS, Al/Si ratio, and SiO2/Na2O ratio of the stabilized samples using a statistical approach, 2) to investigate the effect of hybrid fiber length on UCS, secant modulus, flexural strength, toughness, and flexural load-deformation characteristics of the stabilized soil. A statistical approach was employed to investigate the relationship between fly ash content, alkali activator content, and UCS value. Optimal fly ash content and alkali activator content were determined based on the statistical model. The geopolymer structure of the stabilized soil was characterized via SEM, EDS, XRD, and FTIR analyses. The effects of fly ash and alkali activator content on UCS, Al/Si ratio, and SiO2/Na2O ratio were determined using the derived statistical model. The study demonstrated that activator content, a critical factor in compaction, significantly influences the UCS value, as much as the effect of the Si/Al and SiO2/Na2O ratios. Additionally, variations in fly ash content led to an increase in the UCS value of up to 15%. Moreover, changing the activator content resulted in a maximum 12-fold increase in UCS value. Incorporating hybrid fibers for stabilization led to higher secant modulus (up to 30%), flexural strength (up to 6%), and ductility without compromising UCS.
AtıfScopus20WoS17OpenAlex18İncele - Yüksek Lisans TeziAçık Erişim2022Polipropilen lif donatılı geopolimer derin karıştırma kolonunun yanıt yüzey yöntemi ile optimizasyonu ve sıcaklık etkisinin araştırılması
Büşra Avlayan
Boyları 30m'ye varan derin karıştırma kolonları kohezyonlu ve kohezyonsuz zeminlerde sıkça kullanılan derin zemin iyileştirme yöntemlerinden biridir. Tamamen zemine gömülü halde çalışan derin karıştırma kolonları kürlerini oluşturuldukları zemin ortamından almaktadır. Bu durumda zemin derinliği boyunca değişen zemin sıcaklığı aynı zamanda derin karıştırma kolonlarının kür sıcaklığı olmaktadır. Derin karıştırma kolonlarının imal edildikleri bölgenin yıllık ortalama sıcaklığı, imalatın yapıldığı günün hava sıcaklığı, zeminin termal iletkenlik katsayısı gibi parametreler zemin derinliği boyunca sıcaklığın yüzey sıcaklığından farklı olmasında rol oynar. Bu nedenle çoğu zaman zemin derinliği boyunca sıcaklık yüzey sıcaklığından farklı olur. Bu durum derin karıştırma kolonlarında zemin derinliği boyunca kür sıcaklığının değişken olması durumunu doğurur. Bu da kolonların taşıma gücüne etki eder. Yapılan bu tez çalışmasında sıcaklık etkisinin yüksek plastisiteli kil içeren bir zemin ortamında polipropilen donatı katkılı geopolimer esaslı derin karıştırma kolonu harcının mekanik özelliklerine olan etkisinin incelenmesi amaçlanmıştır. Yapılan çalışma kapsamında Amerikan Karayolları İdaresi'nin (FHWA) derin karıştırma kolonları için önermiş olduğu numune hazırlama şekilleri dikkate alınarak 50 mm çapında ve 100 mm yüksekliğinde numuneler oluşturulmuş. Geopolimer malzemenin elde edilmesinde bağlayıcı olarak F sınıfı uçucu kül kullanılmıştır. Aktivatör olarak kütlece %50-%50 oranında 10 M NaOH ve Na2SiO3 çözeltileri kullanılmıştır. Çalışma üç aşamada gerçekleştirilmiştir. Birinci aşamada yanıt yüzey yöntemi kullanılarak maksimum serbest basınç dayanımını veren bağlayıcı miktarı ve aktivatör içeriği belirlenmiştir. Çalışmanın ikinci aşamasında optimum miktarda bağlayıcı ve aktivatöre farklı oranlarda 6mm uzunluğunda polipropilen donatı karıştırılarak elde edilen numunelerin serbest basınç dayanımı belirlenmiştir. Bu suretle maksimum serbest basınç dayanımını veren donatı içeriği elde edilmiştir. Çalışmanın üçüncü adımında ideal miktarları belirlenen bağlayıcı, aktivatör ve polipropilen lif katkıları ile zemin numuneleri hazırlanmıştır. Hazırlanan numuneler 5°C, 10°C, 20°C ve 30°C'lik kür sıcaklıklarında 7 gün ve 28 gün kürlenmiştir. Kürlenen numuneler serbest basınç deneyleri ve üç eksenli basınç deneylerine tabi tutulmuştur. Bu suretle sıcaklık etkisinin serbest basınç dayanımı, elastisite modülü, içsel sürtünme açısı ve kohezyon parametrelerine olan etkisi incelenmiştir. Yapılan çalışma sonucunda numunelerin mekanik özelliklerinin 20°C'lik kür sıcaklığına kadar artan sıcaklıkla birlikte dikkate değer şekilde arttığı, bu sıcaklık değerinin üzerinde mekanik özelliklerde büyük bir değişimin olmadığı görülmüştür.
- Yüksek Lisans TeziAçık Erişim2022Geopolimer bağlayıcı ve mikro fiber donatı ile stabilize edilen yüksek plastisiteli silt zeminin mekanik özellikleri
Kutluhan Kurucu
Yapılan bu tez çalışması, kütlece %50 sodyum hidroksit ve %50 sodyum silikat bileşenlerinden oluşan aktivatörle aktive edilmiş C-Sınıfı uçucu kül, ve fiber donatı katkısı ile, yüksek plastisiteli siltli bir zeminin iyileştirilmesi esasına dayanmaktadır. Çalışma kapsamında 3 mm ve 12 mm uzunluğunda fiber donatı kullanılmıştır. Farklı fiber donatı uzunluk kombinasyonlarının alkali aktif C-sınıfı uçucu kül ile iyileştirilmiş, yüksek plastisiteli siltli bir zeminde eğilme ve kayma mukavemeti parametreleri üzerindeki etkisi araştırılmıştır. Tez çalışması üç kısımdan oluşmaktadır. Bu kısımlar; (i) Yanıt Yüzey Yöntemi (YYY) ile maksimum serbest basınç dayanımı veren aktivatör ve uçucu kül bileşenlerinin optimum miktarlarının belirlenmesi, (ii) 3 mm ve 12 mm uzunluğundaki fiber donatıların farklı oranlarda geopolimer harca eklenmesi sureti ile donatı içeriğinin maksimum eğilme dayanımı ve tokluk parametreleri üzerindeki etkilerinin belirlenmesi, (iii) 3 mm ve 12 mm uzunluğundaki donatıların farklı oranlarda karıştırılması sonucu elde edilen donatı kombinasyonlarının geopolimer esaslı zemin harçlarının maksimum eğilme gerilmesi, tokluk, kayma mukavemeti parametreleri üzerine olan etkilerinin incelenmesi aşamalarından oluşmaktadır. Çalışma kapsamında zemin tanımlama deneyleri, serbest basınç dayanımı, üç eksenli basınç dayanımı, üç nokta eğilme deneyleri gerçekleştirilmiştir. Çalışma sonucunda 3 mm ve 12 mm uzunluğundaki donatı kombinasyonlarının, yalnız 3 mm ya da yalnız 12 mm uzunluğundaki donatılara göre daha yüksek maksimum eğilme dayanımı ve kohezyon değeri verdiği görülmüştür. 12 mm uzunluğundaki donatılar kullanılarak iyileştirilen zeminlerin tokluk değerinin 3 mm uzunluğu ve farklı donatı kombinasyonlarına göre daha yüksek olduğu görülmüştür.
- MakaleAçık Erişim2022Scopus SJRQ3An Investigation of the Effect of Curing Temperature on the Deformation Characteristics of the Stabilized Soil Layers Treated with Lime and Tuff Wastes with Response Surface Method
Kamiloglu, Hakan Alper; Turan, Huseyin
The shallow spread foundations are one of the widely used foundation types for low-rise, low-cost or commercial buildings. However, it is not possible to use this type of foundation for soils with low bearing capacity or capable of excessive settlements. In these cases, stabilized soil layers overlying insufficient soil may be alternative to the high-cost foundation systems. As the temperature of the soils depends mostly on air temperature for shallow depths, curing conditions of the stabilized soil layers are affected by the air temperature. The effect of curing temperature on the pressure-settlement relation of the layered soil is a gap in the literature. This study investigates the effect of Bayburt tuff on pressure-settlement characteristics of layered soil for various curing temperatures. The specific objectives of this paper are to (1) examine the effect of using the waste tuffs as a stabilization agent in layered soils, (2) evaluate the usability of response surface methodology (RSM) to estimate shear strength parameters (c, ϕ), unconfined compression strength, and secant modulus of the stabilized soil with less experiment, (3) investigate the effect of dimensions of the stabilized soil block (length, with and thickness) on pressure-settlement relations under various curing temperature (T = 3 °C, 13 °C, 23 °C, 33 °C, 43 °C). This study comprises experimental and numerical parts. In the experimental part, strength parameters (c, ϕ) and secant modulus of stabilized soil samples were estimated with response surface methodology for various curing temperatures (3 °C, 23 °C, 43 °C). The effects of curing temperature on shear strength and Bulk’s modulus parameters were determined with the derived RSM model. In the numerical part of the study plate load test was simulated with the derived 2D axisymmetric FE model. The parameters required for the FE analyses were determined with the derived RSM model. As a result of the study, it was seen that it is possible to estimate experimental parameters accurately using the RSM approach with fewer tests. Bayburt tuff and lime mixtures increase the stiffness of the layered soil. The curing temperature has considerable effects on the pressure-settlement relationship up to a certain value. After a certain value increasing curing temperature has no considerable effects on the stiffness of the layered soil.
AtıfScopus3WoS1İncele - MakaleAçık Erişim2021Estimation of shear strength parameters of a high plasticity clayey soil stabilized with lime at different curing temperatures using Response Surface Methodology (RSM)
Kamiloglu, Hakan Alper; Turan, Huseyin
Response Surface Methodology (RSM) is useful to find the optimum value of the response, to examine the relationship between independent variables and responses, or to shorten very complicated and timeconsuming numerical analyses. Although the RSM is a commonly used method in many branches of engineering, the use of this method is limited in geotechnical studies. In this study, the effect of curing temperature on shear strength and unconfined compressive strength parameters of lime stabilized clayey soil was examined. Within the scope of the study, it was aimed to evaluate the Response Surface Method to estimate these parameters with less experimental effort. In the study effect of the temperature was controlled with five different curing temperature level (3 degrees C, 13 degrees C, 23 degrees C, 33 degrees C, 43 degrees C). Three axial (UU) and unconfined compression tests were performed on 40 pieces of stabilized soil samples cured along 28 days at various temperatures. The experimental design was performed with Response Surface Methodology to reduce the test number. Within this scope, an equation was derived statistically to estimate the deviator strength of the samples. Statistical analyses were performed considering deviator strengths of the 18 pieces of samples. As a result of the study, it was seen that it is possible to estimate shear strength and unconfined compression strengths of the samples accurately by using fewer test numbers with Response Surface Methodology.
AtıfWoS2OpenAlex2
İncele - MakaleAçık Erişim2020Optimization of exopolysaccharide production of Lactobacillus brevis E25 using RSM and characterization
Ermis, Ertan; Poyraz, Ecem; Dertli, Enes; Yilmaz, Mustafa Tahsin
Response surface methodology was used to determine the exopolysaccharide production of Lactobacillus brevis E25. The effects of three variables, temperature (30, 36 and 42 °C), incubation time (18, 33 and 48 h) and initial pH of growth medium (4.5, 5.5, and 6.5) were studied. Under optimum growth conditions, the amount of exopolysaccharide derived from Lactobacillus brevis E25 ranged from 10 to 35 gL-1. The size of EPS molecules ranged from 105 to 107 Da. Infra red spectrum analysis showed characteristics absorption peaks indicating the presence of-OH, C=O and C-H groups. Furthermore, only glucose was detected as monosaccharide in exopolysaccharide structure, revealing that the structure of exopolysaccharide is a homopolymeric glucan type. Based on the differential scanning calorimeter thermograms, exopolysaccharide’s melting temperature was observed around 116 °C.
AtıfScopus18OpenAlex18İncele - BildiriYalnız künye2012Scopus SJRQ3Optimization of process parameters for removal of Cr(VI) by Hypnum cupressiforme using response surface methodology (RSM)
Özkan, Esra; Gürses, Ahmet; Açikyildiz, Metin; Güneş, Kübra
Response surface methodology was applied to optimize the removal of chromium ion by Hypnum cupressiforme from an aqueous solution. Experiments were analyzed using response surface methodology (RSM). The biosorption process was investigated as a function of five independent factors, sorption time, sorption temperature, initial ion concentration, sorbent dosage, and mixing rate. The optimum conditions for the chromium biosorption were found to be 760 min, 313K, 30mg/L, 0.01 mg/100mL, 107 min-1 respectively, for sorption time, sorption temperature, initial ion concentration, sorbent dosage, and mixing rate.
AtıfScopus2İncele