Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Dertli, Enes(115)
- Kaya, Yunus(50)
- Ayata, Ümit(48)
- Şahin, Engin(48)
- İspirli, Hümeyra(46)
- Bayraktar, Bülent(42)
- Şenay, Volkan(41)
- Can, Zehra(39)
- Özen, Soner(37)
- Bayram, Sinan(35)
- Pat, Suat(35)
- Öztürk, Mesut(35)
- Ecem Bayram, Nesrin(34)
- Esmer, Yusuf(34)
- Battal, Fetullah(33)
- Artar, Musa(32)
- Öner, Erdal(32)
- Korkmaz, Şadan(31)
- Yilmaz, Mustafa Tahsin(31)
- Ertugrul, Mehmet(30)
- Mercan, Emin(30)
- Hasar, Ugur Cem(29)
- Kutlu, Naciye(28)
- Özdemir, Akın(27)
- Kul, Murat(26)
- Cuce, Erdem(25)
- Kamiloğlu, Aybike(25)
- Bayram, Ozkan(24)
- Sefali, Abdurrahman(24)
- Sert, Durmuş(24)
- Çolak, Murat(24)
- Ayazoglu, Rabil(22)
- Gıdık, Betül(22)
- Maden, Sedat(22)
- Ustabulut, Mete Yusuf(22)
- Uçurum, Metin(22)
- Akeren, Zahide(21)
- Dirican, Ebubekir(21)
- Kara, Yakup(21)
- Abdioglu, Murat(20)
Yayınlar
- MakaleAçık Erişim2023Scopus SJRQ1Diversity of Clostridium spp. causing late blowing in Kaşar cheese and their behaviour against various antimicrobials
Kaya, Halıl Ibrahim; Simsek, Omer; Akgunoglu, Ozlem
One of the problems encountered during storage of Kaşar cheese is blowing. The diversity of Clostridium spp. having a role in blowing was screened and the sensitivity of Clostridium spp. strains against nisin, NaCl, CuSO4, and EDTA was determined and compared. According to 16S rDNA sequence similarity, 12 Clostridium spp. isolates were Clostridium sporogenes while 3 were Clostridium jeddahense. Gas formation by Clostridium spp. spores can be significantly inhibited by reducing the pH below 5.5 and adding 400 IU mL−1 nisin when the number of spores are below 300 spore mL−1. It was determined that the late-blowing problem in Kaşar cheese is caused by C. sporogenes and C. jeddahense strains, but the success of preventive agents is closely related to the amount of spores.
AtıfScopus7WoS4OpenAlex6
İncele - MakaleYalnız künye2023Scopus SJRQ2Efficient bioreduction of 1-(furan-2-yl)ethanone into enantiomerically pure drug precursor by Lactobacillus paracasei BD101
Şahin, Engin
Asymmetric bioreduction catalyzed by biocatalyst have shown considerable potential in the preparation of chiral alcohols. (R)-1-(furan-2-yl)ethanol ((R)-2) can be used precursor in the synthesis of many naturally bioactive piperidine alkaloids such as (−)-Cassine, (−)-Spectaline, (−)-Carnavaline, Prosafrine and (−)- Prosafrinine. Moreover, (R)-2 a key chiral precursor in the production of α, β-unsaturated δ- lactones, which have antifungal, antibiotic, and cytotoxic effects on human tumor cells. However, the synthesis routes of (R)-2 still pose significant challenges in term of unsatisfactory enantiomeric excess (ee) and gram scale synthesis. In this study, Lactobacillus paracasei BD101 biocatalyst from boza, a cereal-based fermented beverage, for the asymmetric bioreduction of the 1-(furan-2-yl)ethanone (1). Following biocatalytic process optimization, (R)-2 was generated with >99% ee and 97% yield. In addition, 9.9 g of 1 was completely converted into (R)-2 on a gram scale (9.78 g, 97% isolated yield) in 48 h. This is the first report about the fabrication of enantiopure (R)-2 in high gram scale using biocatalyst. The optical purity of (R)-2 produced by asymmetric reduction with L paracasei BD101 was also noteworthy since it was the highest documented to date. This study provides an efficient green process for the biocatalytic synthesis of (R)-2.
AtıfScopus16WoS15OpenAlex14İncele - MakaleYalnız künye2023Scopus SJRQ1Investigation of vibration performance of pure active single and multi-feedback controls for a tall RC building
Uyar, Mehmet; Ergün, Mustafa
Structural control methods are applied to eliminate the structural damages caused by the vibrations in the buildings and to improve their dynamic behavior of them under dynamic lateral loads. In this paper, the pure active control performance of a tall building under the influence of earthquake records, in which the effective time duration is determined by considering the ARIAS energy distribution, is presented. The building's pure active control performance in the period when the earthquake records have the maximum effect on the structure is examined. Eleven earthquake records are selected to better evaluate the effect of vibration control performance. A genetic algorithm is used to determine the parameters of single and multi-feedback controllers, and its effect on the vibration eliminations at the top and all floors is studied. Also, the effect of displacement and velocity feedback on seismic vibration control is evaluated. To carry out the vibration control studies of the building, the mathematical model is extracted from the finite element model created in ANSYS and verified with finite element analysis. It is observed that the displacement value at a reference location on the building is reduced from 0.735 m to 0.019 m, 0.004 m, and 0.002 m, respectively, by the Proportional-Integral-Derivative, Direct Velocity Feedback, and Optimal controllers. The results show that the multi-feedback control is more effective than the single-feedback control application in reducing the vibration amplitudes at all floors in the pure active control system.
AtıfScopus6WoS5OpenAlex5İncele - MakaleAçık Erişim2023Scopus SJRQ3A STUDY ON THE CONTACT PROBLEM OF A LAYER CONSISTING OF FUNCTIONALLY GRADED MATERIAL (FGM) IN THE PRESENCE OF BODY FORCE
Adiyaman, Gökhan; Öner, Erdal; Yaylaci, Murat; Birinci, Ahmet
One of the most important components of the early design process for layered systems is gaining a knowledge of the behavior of materials under varied contact situations. Functionally graded materials (FGMs) have grown in popularity in layered systems as a result of their numerous benefits, such as permitting the reduction of local stress concentrations and thermal stresses often experienced in traditional composites. This paper suggests an analytical approach to solving the continuous and discontinuous contact problems of a functionally graded (FG) layer subjected to a distributed load. Elasticity theory and integral transform methods provide the basis of the aforementioned analytical approach. The FG layer rests on a half-plane that is homogeneous, and there is no adhesion or bonding at the contact surface. For this problem, we assume an exponentially varying shear modulus and mass density in the FG layer. In the solution, the body force of the FG layer is considered. The problem is solved analytically by applying boundary conditions for both continuous and discontinuous contact cases. The presented results show the effects of load factor, amplitude of distributed load, inhomogeneity parameters, and interface material property mismatch on contact stress distributions, initial separation load (critical load), initial separation distance, starting and end point of separation, and separation interval.
AtıfScopus39WoS40OpenAlex30İncele - MakaleAçık Erişim2023Scopus SJRQ2EFFECTS OF ARTIFICIAL WEATHERING ON THE SURFACE PROPERTIES OF COATED RADIATA PINE
Sahin, Sirri; Esteves, Bruno; Can, Ahmet; Sivrikaya, Hüseyin; Domingos, Idalina; Ferreira, José; Ayata, Ümit
Radiata pine boards were coated with two different methods A and B both beginning with a hydro primer and finishing with a mat oil but method A using an acrylic high gloss coating and method B three layers of an acrylic sealer in between. The samples were subjected to aging processes for 144 h, 288 h, and 432 h by using UV-A 340 nm lamps. The CIE L*a*b* and CIE L*C*H* coordinates were determined (L*, a*, b*, C*, ho*, ΔE*), gloss (perpendicular (⊥) and parallel (//) to the grain at 20°, 60°, and 85° angles) and surface adhesion strength via the pull-off method were tested before and after weathering. Results have shown that lightness (L*), decreases with weathering for both varnish applications with a higher decrease for the B coating system. Redness increased for both applications with no significant differences. At the same time there was a yellowing of the samples along the weathering period. Parallel and perpendicular gloss decreased for 20º and 60º angles while it increased for 85º angle. The adhesion strength of method A was higher and its decrease with weathering was smaller than for method B. Both varnish applications have proven to confer some protection against wood discoloration, but method A showed the best results and is therefore the best method to be used by radiata pine.
AtıfScopus2WoS2OpenAlex2İncele - MakaleYalnız künye2023Scopus SJRQ3Seismic response of adjacent buildings interconnected by viscous dampers considering soil-structure interaction
Hatipoğlu, Yavuz S.; Düzgün, Oğuz A.
The effectiveness of fluid viscous dampers (FVDs) on dynamic response mitigation of coupled two adjacent structures was investigated, considering soil-structure interaction (SSI) effects under earthquake excitation. A numerical procedure was employed to evaluate system response. The finite elements were used for the numerical treatment of the adjacent buildings and soil region. Viscous boundary conditions were used as special non-reflecting boundaries on the edges of finite soil region. According to the results, the FVDs were found to be very effective for dynamic response mitigation of the adjacent buildings, even if considering the soil medium. The results showed that the most affecting parameter on the system response was found to be soil type. It was also concluded that when adjacent structures coupled by FVDs, the maximum values of the roof displacements, the base shear forces, and the base bending moments could decrease up to around 50%. Changing in lateral stiffness of the one building has minor effects on the effectiveness of viscous dampers
AtıfScopus5WoS5OpenAlex2İncele - MakaleYalnız künye2023Scopus SJRQ2The melatonin agonist ramelteon attenuates bleomycin-induced lung fibrosis by suppressing the NLRP3/TGF-Β1/HMGB1 signaling pathway
Aydin, Pelin; Aksakalli-Magden, Zeynep B.; Civelek, Maide S.; Karabulut-Uzuncakmak, Sevgi; Mokhtare, Behzad; Ozkaraca, Mustafa; Alper, Fatih; Halici, Zekai
Purpose: The possible effects of ramelteon, a melatonin receptor agonist on bleomycin-induced lung fibrosis were analyzed via transforming growth factor β1 (TGF-β1), the high mobility group box 1 (HMGB1) and Nod-like receptor pyrin domain-containing 3 (NLRP3) which are related to the fibrosis process. Materials and methods: Bleomycin (0.1 mL of 5 mg/kg) was administered by intratracheal instillation to induce pulmonary fibrosis (PF). Starting 24 h after bleomycin administration, a single dose of ramelteon was administered by oral gavage to the healthy groups, i.e. PF + RM2 (pulmonary fibrosis model with bleomycin + ramelteon at 2 mg/kg) and PF + RM4 (pulmonary fibrosis model with bleomycin + ramelteon at 4 mg/kg) at 2 and 4 mg/kg doses, respectively. Real-time polymerase chain reaction (real-time PCR) analyses, histopathological, and immunohistochemical staining were performed on lung tissues. Lung tomography images of the rats were also examined. Results: The levels of TGF-β1, HMGB1, NLRP3, and interleukin 1 beta (IL-1β) mRNA expressions increased as a result of PF and subsequently decreased with both ramelteon doses (p < 0.0001). Both doses of ramelteon partially ameliorated the reduction in the peribronchovascular thickening, ground-glass appearances, and reticulations, and the loss of lung volume. Conclusions: The severity of fibrosis decreased with ramelteon application. These effects of ramelteon may be associated with NLRP3 inflammation cascade.
AtıfScopus9WoS9OpenAlex8
İncele - MakaleAçık Erişim2023Effects of bleaching chemicals on some surface characteristics of olon (Zanthoxylum heitzii) wood; [Olon (Zanthoxylum heitzii) odununun bazı yüzey özellikleri üzerine ağartıcı kimyasalların etkileri]
Peker, Hüseyin; Ayata, Ümit
Olon wood is used internationally in plywood, furniture, interior carpentry, and mold making. In this study, the effects of wood bleaching chemicals (oxalic acid and H2O2+NaOH) on certain surface properties (color, glossiness, and whiteness index: WI*) of olon wood (Zanthoxylum heitzii) were investigated. The results of the bleached samples were compared with those of a control group. Based on the results obtained, it was determined that the variance analyses conducted for all tests in the study yielded statistically significant results. Application of both bleaching chemicals led to an increase in the ho and L* values. The ∆E* values were determined as 2.07 for the single-component and 10.30 for the double-component. In contrast, these parameters increased with the single-component bleach while the a*, b* and C* values decreased with the double-component wood bleach. The WI* values exhibited an increase in both directions when they were exposed to both bleaching chemicals. Both bleaching agents resulted in reductions in glossiness values at 85 degrees in both directions. Furthermore, there were declines with the single-component bleach and rises with the double-component bleach when measuring glossiness at 60 degrees in both directions.
AtıfScopus3OpenAlex4TR Dizin2
İncele - MakaleYalnız künye2023Scopus SJRQ1Parameter extraction method for reflection-asymmetric bianisotropic metamaterial slabs using one-port measurements
Hasar, Ugur Cem; Kaya, Yunus; Ozturk, Hamdullah; Ertugrul, Mehmet; Ramahi, Omar Mustafa
An effective microwave method is developed for extracting electromagnetic properties of bianisotropic metamaterial (MM) slabs. As a non-iterative method, it utilizes only the one-port (air-backed and metal-backed MM slab) scattering (S-) parameter measurements. This is a useful feature especially for vector network analyzers, such as MS46131A, MS46121B, and R60, performing only one-port S-parameter measurements. Electromagnetic properties of a bianisotropic MM slab formed by C-shaped resonators are measured by an X-band (8.2–12.4 GHz) rectangular waveguide setup. The effect of any gap between the short-circuit termination for metal-backed measurements and the end of the MM slab on extracted electromagnetic properties is also examined for evaluating the possible error for proposed method.
AtıfScopus3WoS3OpenAlex5İncele - MakaleAçık Erişim2023Scopus SJRQ2Suberosin Alleviates Sepsis-Induced Lung Injury in A Rat Model of Cecal Ligation and Puncture
Karabulut Uzunçakmak, Sevgi; Halıcı, Zekai; Karakaya, Songül; Kutlu, Zerrin; Sağlam, Yavuz Selim; Bolat, İsmail; Aydın, Pelin; Kılıç, Ceyda Sibel
Background/aims: Sepsis is one of the major problems encountered in intensive care units, causing organ damage and increasing mortality. Suberosin (SBR) is a type of coumarin with antioxidant and anti-inflammatory activities. The goal of this study is to explore the protective effects of SBR on the lungs in a rat model of sepsis. Methods: Male Wistar rats were utilized in this study. A cecal ligation and puncture (CLP) model was applied to induce sepsis. Rats were separated into six groups with nine animals in each group, including healthy control, SBR, CLP, and CLP + SBR (5, 10, and 20 mg/kg) groups. Superoxide dismutase (SOD), glutathione (GSH) enzyme activities, and malondialdehyde (MDA) level were measured via enzyme-linked immunosorbent assay (ELISA). The messenger RNA (mRNA) expressions of tumor necrosis factor α (TNF-α) and interleukin 1β (IL-1β) were evaluated by real-time polymerase chain reaction (RT-PCR). Histopathological changes in the lungs were investigated with hematoxylin and eosin (H&E). Results: MDA levels and GSH and SOD enzyme activities were negatively affected in the CLP group, but SBR treatment ameliorated these oxidative stress parameters in the SBR1-3 groups (p< 0.05). The mRNA expressions of TNF-α and IL-1β were increased in the CLP group, and SBR treatment decreased those expression levels in a dose-dependent manner (p < 0.05). Organ damage and necrosis were seen in the CLP group and were alleviated in the SBR3 group. Immunohistochemical (IHC) analysis of lung tissues demonstrated decreased TNF-α and IL-1β immunopositivity in the SBR1-3 groups (p< 0.05). Conclusions: SBR ameliorated sepsis-related lung injury in a dose-dependent manner. This compound has significant potential as a future agent in the treatment of sepsis.
AtıfScopus15WoS11OpenAlex15İncele - MakaleAçık Erişim2023Scopus SJRQ3A Study on YouTube Channels of Foreign Languages Teaching Foundation
Maden, Sedat; Kaya, Musa
This study was conducted to examine the YouTube channels of Yunus Emre Institute, British Council, Institut Français, Instituto Cervantes, Confucius Institute and Goethe Institut foundations having channels on YouTube, one of the largest video sharing platforms of the world. The channels in this study, were examined through the qualitative research method in terms of the upload date, the numbers of subscribers, the numbers of videos, the videos’ grouping status, the number of video views, and the features of the most watched videos. As a result of the study, it appears that Yunus Emre Institute created its YouTube channel in 2014, British Council in 2010, Institut Français in 2017, Instituto Cervantes in 2017, Confucius Institute (U.S.) in 2017 and Goethe Institute in 2007. Yunus Emre Institute, one of the channels on YouTube, has more than 64400 subscribers, British Council has 542000, Institut Français has 3650, Instituto Cervantes has 69100, Confucius Institute has 801, and Goethe Institute has 301000. It is found that Yunus Emre Institute has 925, British Council has 134, Institut Français has 463, Instituto Cervantes has 1115, Confucius Institute has 82, and Goethe Institute has 1152 videos on YouTube. It has been determined that YouTube channels belonging to institutions established to teach the world's most spoken languages were created adopting similar paradigms and after the year 2007.
AtıfScopus1OpenAlex1İncele - 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 - MakaleAçık Erişim2023Scopus SJRQ3Preventive and therapeutic effects of the peel powder of P. granatum in a rat sepsis model; [Preventivni i terapijski učinci praha kore pitomog šipka (P. Granatum) na modelu sepse u štakora]
Ülker, Ufuk; Demirel, Mürşide Ayşe; Bayraktar, Bülent; Alçıgır, Mehmet Eray; Aksoy, Adil
The aim of the present study was to evaluate the treatment potential of Punica granatum L. peel powder in an experimentally induced sepsis model in rats. Sepsis was induced in 10-week-old, male, Wistar Albino (n=24) rats. The animals were divided into four groups: Sham-operated (S) Group, Control (C) Group, Treatment-1 (T1) Group, and Treatment-2 (T2) Group. To induce the sepsis model, the cecal ligation and puncture procedure was performed. The P. granatum peel powder (200 mg/kg; per os) was applied one hour before (T1) and 10 hours after (T2) surgery in a volume of 2 mL. At the end of the experimental procedure, microbial and histopathological analyses were performed. The histopathological scores on the liver, lungs, heart, kidney, spleen, and pancreas were evaluated. Escherichia coli, Staphylococcus aureus and E. coli + S. aureus were isolated from blood cultures. Severe bacteria were detected in the blood of the group C animals. It was found that there were fewer bacteria in groups T1 (n=2) and T2 (n=4) compared with group C. There were no lesions in the pancreas tissues of any groups. Vascular changes, degeneration, and necrosis were common in the organs in all cases of group C compared to group S. The findings in group T1 were similar to those in group C, however, it was seen in fewer animals. It was determined that there was a general improvement in group T2, and in addition the existing lesions were moderate in severity. In conclusion, P. granatum L. peel powder prevented CLP-induced lung injury in experimental rats. Thus, P. granatum L. peel powder may be an alternative therapeutic agent against lung tissue injury induced by sepsis. The recovery from inflammation was better in group T2 than in the other groups. According to the results of the current study, P. granatum peel powder was found to be effective in the treatment of sepsis with antimicrobial and anti-inflammatory functions.
AtıfScopus1WoS1OpenAlex1İncele - MakaleAçık Erişim2023Scopus SJRQ3Synthesis of Arylsulfonyl Hydrazone Derivatives: Antioxidant Activity, Acetylcholinesterase Inhibition Properties, and Molecular Docking Study
Demirci, Yasin; Kalay, Erbay; Kara, Yakup; Güler, Halil İbrahim; Can, Zehra; Şahin, Engin
In this current paper, fifteen novel sulfonyl hydrazone derivatives have been successfully synthesized and evaluated for antioxidant activity as well as their effects on inhibitory activity toward acetylcholinesterase (AChE). By using 1H NMR, 13C NMR, FT-IR, and high-resolution mass spectrometry methods, the full characterization data of the novel compounds were obtained. The synthesized compounds capacity to inhibition glucosidase and exhibit antioxidant activity were tested in vitro. It was determined that compounds (E)-4-((2-((4-chlorophenyl)sulfonyl)hydrazone)methyl)-2-methoxyphenylfuran-2-carboxylate (21), (E)-2-methoxy-4-((2-(phenylsulfonyl)hydrazone)methyl)phenylfuran-2-carboxylate (17) and (E)-4-((2-((4-bromophenyl)sulfonyl)hydrazone)methyl)-2-methoxyphenylfuran-2-carboxylate (25) showed good antioxidant activity. Upon examining the acetylcholinesterase inhibitory activity, it was determined that compounds (E)-2-methoxy-4-((2-((4-methoxyphenyl)sulfonyl) hydrazone)methyl)phenylacetate (27) (10.39 μM), (E)-4-((2-((4-chloro phenyl)sulfonyl) hydrazone)methyl)-2-methoxyphenylfuran-2-carboxylate (21) (10.81 μM), (E)-4-((2-((4-chloro phenyl)sulfonyl)hydrazone)methyl)-2-methoxyphenyl thiophene-2-carboxylate (22) (12.92 μM) and (E)-2-methoxy-4-((2-(phenylsulfonyl)hydrazone)methyl)phenylfuran-2-carboxylate (17) (12.93 μM) showed potent inhibitory effects. Molecular docking simulations were used to investigate the interactions of novel sulfonyl hydrazone derivatives with human acetylcholinesterase protein. The ligands exhibited strong binding to the receptor protein with potent inhibition.
AtıfScopus18WoS18OpenAlex19İncele - MakaleYalnız künye2023Scopus SJRQ3Methoxy-activated indole-7-carbohydrazides; synthesis, antioxidant, and anticancer properties
Kandemir, Hakan; İzgi, Samet; Cınar, Irfan; Cebeci, Fatma; Dirican, Ebubekir; Saglam, Mehmet F.; Sengul, Ibrahim F.
Indole has been known as a key heterocyclic motif in the development of new structures for both chemical and biological properties. In this current study, a new range of indole-7-carbohydrazides has been successfully synthesized starting from the readily available 3-phenyl and 2,3-diphenyl 4,6-dimethoxyindoles. The structures of the novel compounds were confirmed by utilizing 1H NMR, 13C NMR, FT-IR, high-resolution mass spectrometry, and single crystal X- ray diffraction techniques. In addition, the indole-7-carbohydrazides showed promising antioxidant results in preliminary screens. Some of the new compounds generated from dimethoxy indoles were also screened for their anticancer activity against SH-SHY5Y (human neuroblastoma), AGS (human gastric adenocarcinoma), and MDA-MB-231 (human breast adenocarcinoma) cell lines. The results revealed that the compound 12 was the promising candidate, showing cytotoxic effects on both neuroblastoma, stomach, and breast cancer cells.
AtıfScopus4WoS4OpenAlex6İncele - MakaleAçık Erişim2023Scopus SJRQ1Evaluation of Optimal Energy Productıon Usıng Deterministic, Probabilistic and Risky Cases In a Multi-Reservoir System
Bacaksız, Efsun; Opan, Mücahit; Kara Dilek, Zuhal Elif; Karadeniz, Murat
In a multi-reservoir system, the stochastic nature of basin data resulting from rainfall introduces risk into water management operations. Effective management that accounts for these risks can obtain maximum benefits from the system. This study presents a description of a multi-reservoir water resources system with hydroelectric power plants, utilizing the energy optimization model developed by OPAN in 2007. The model was applied to reservoirs located successively on the Lower Kızılırmak River in the Kızılırmak Basin, with the objective function being the maximization of firm power by using drought period inflows and total energy by using monthly average inflows. The study considered three scenarios: deterministic, probabilistic, and risky (critical cases), with probabilities of inflows from the basin being determined for the latter. Monthly inflows with determined probabilities were used to obtain data for the risky case. Optimum operating levels were determined based on this data to maximize firm power and total energy. According to the operating levels, the reservoir with the largest useful volume manages the operation. The values obtained from the optimization were then used in multivariate regression analysis using the Statistical Package for Social Scientists (SPSS), a statistical analysis program. The analysis explored the effects of monthly operating levels in the reservoirs, the amount of inflow released from the spillway, the amount of inflow released for energy production, the monthly average inflow to the reservoirs, and firm power values on energy production.
AtıfScopus7WoS6OpenAlex7İncele - MakaleAçık Erişim2023Scopus SJRQ3Bounds for the blow-up time a class of integro-differential problem of parabolic type with variable reaction term; [Bornes sur le temps d’explosion pour une équation intégro-différentielle de type parabolique avec un terme réactif variable]
Ayazoglu, Rabil; Akkoyunlu, Ebubekir
This paper is concerned with the blow-up time of the solutions to an integro-differential problem of parabolic type with variable growth if blow-up occurs. By using the differential inequality technique, we obtain lower bounds for the blow-up time and some global existence results under some conditions to variable exponent of reaction, memory kernel, and initial value.
AtıfScopus1WoS1İncele - MakaleAçık Erişim2023Scopus SJRQ3An Investigation of Digital Transformation Activities of Higher Education in Türkiye
Yavuz, Mehmet; Kayalı, Bünyami; Karaman, Selçuk
This study aimed to examine the digital transformation activities of universities. The document analysis method was used in the study, one of the qualitative research methods. In this context, the websites of 207 universities were examined using the "Digital transformation activities form of universities" developed by the researchers. The data were analyzed by content analysis method. As a result of the analysis, six broad themes, also called dimensions in the current study, emerged, such as research, education, culture, process, technology, and community service regarding digital transformation activities of higher education institutions. Infrastructure studies, educational activities for research and supply and the use of smart systems to provide various cooperation opportunities are discussed within the scope of the research dimension. There are online scientific studies, online education programs, digital resources, and open access opportunities in the education dimension. As for the culture dimension, online manager activities for corporate culture, training of trainers, culture-arts and scientific activities took place. With the transfer of business processes to the digital environment, corporate promotion and communication activities were included in the process dimension. In the technology dimension, smart systems, smart campus applications and innovative technologies took place. Finally, the scope of community service compromised related units, university-industry cooperation activities and social activities. As a result, universities carry out activities to support processes such as education, research, management, and cooperation and to realize them in digital environments. For this purpose, it can be said that they perform effective and efficient processes by using various intelligent systems.
AtıfScopus7OpenAlex10İncele - MakaleYalnız künye2023Scopus SJRQ1Honey-Water Content Analysis by Mixing Models Using a Self-Calibrating Microwave Method
Hasar, Hafize; Hasar, Ugur C.; Kaya, Yunus; Ozturk, Hamdullah; Izginli, Mucahit; Oztas, Taskin; Aslan, Nevzat; Ertugrul, Mehmet; Barroso, Joaquim J.; Ramahi, Omar M.
Microwave techniques, as an indirect approach, can be applied for analyzing water content in honey by way of permittivity measurements. However, these techniques require proper calibration to accurately perform such indirect evaluation. Improper calibration standards used in this calibration process could naturally result in a reduction in the accuracy and thus the performance of dielectric characterization using microwaves. Self-calibrating microwave techniques can reduce the effects of imprecise standards and thus improve the performance of microwave measurements by bypassing the requirement of calibration standards. In this study, we develop a self-calibrating microwave measurement technique to determine the relative permittivity of honey samples and implement binary mixing models to predict adulteration levels of water-adulterated honey. From this implementation, it is observed that the parallel-capacitance mixing model could efficiently be applied to determine the concentration of water adulteration by examining the differences between absolute values of the real parts of the measured and predicted complex permittivities of adulterated honey.
AtıfScopus18WoS16OpenAlex18İncele - MakaleAçık Erişim2023Scopus SJRQ3EVALUATION OF YIELD AND QUALITY CHARACTERISTICS OF OIL SUNFLOWER (Helianthus annuus L.) VARIETIES CULTIVATED IN SEMI-ARID IRRIGATED CONDITIONS IN THE NORTHEAST OF TURKEY
Gul, Volkan; Gidik, Betul; Sefaoglu, Firat
Sunflower, an oil plant grown in many parts of the world, is capable of growing in many different climatic conditions. It is of great importance to carry out studies on the adaptation of new varieties and to determine the varieties suitable to the ecology of the region in areas where sunflower cultivation is intense. This study was carried out to determine yield and quality characteristics of some sunflower cultivars (SANBROMR, BOSFORA, SYBARBATI, ROSETTA, LG5485, P64LL62, SYGIBRALTAR, P64LC108 P64LE119, P64LP130, P63LE113, 11TR077, ESNIEGARA, ADELYA, and DERAY) under Bayburt providence conditions of Turkey in 2020-2021. It has been determined that there are significant differences between the cultivars for the traits examined. The highest average seed yield (4194.2 kg ha-1) and average linoleic acid content (65.09%) were found for BOSFORA. The highest average oil content ESNIEGARA (48.78%) and average oil yield respectively were obtained from ESNIEGARA (186.02 kg ha-1) and BOSFORA (182.93 kg ha-1) varieties and the highest average oleic acid content was obtained from 11TR077 variety (41.78%). The results of this study emphasized the importance of varieties in sunflower growing. BOSFORA and ESNIEGARA varieties had high yield and quality characteristics in the ecologies of a semi-arid climate.
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