Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Gul, Muhammet(86)
- Güler, Ömer(69)
- Akkurt, Nevzat(68)
- Baskonus, Haci Mehmet(53)
- Tekin, H.O.(52)
- Bulut, Hasan(50)
- ALMisned, Ghada(49)
- Serdar, Osman(43)
- Yucesan, Melih(43)
- Paksoy, Mehmet Yavuz(42)
- Yildirim, Numan(41)
- Zengin, Gokhan(40)
- Yildirim, Nuran Cikcikoglu(39)
- Ince, Muharrem(37)
- Kocabaş, Mehmet(37)
- Celik, Erkan(35)
- Benzer, Fulya(33)
- Sulaiman, Tukur Abdulkadir(29)
- Aslan, Naim(27)
- Can, Erkan(27)
- Kutlu, Banu(27)
- Kök, Mediha(27)
- Tanyol, Mehtap(27)
- Danabas, Durali(26)
- Kutluyer, Filiz(26)
- Özkul, İskender(26)
- Ates, Mehmet(25)
- Yildirim, Ozal(25)
- Onat, Onur(23)
- Topal, Murat(23)
- Demir, Veysel(22)
- Erten, Fusun(22)
- Guler, Omer(22)
- Say, Yakup(22)
- Yaman, Mehmet(22)
- Alataş, Mevlüt(21)
- Güler, Seval Hale(21)
- Çimen, Okay(21)
- Baykal, Duygu Sen(20)
- Mete, Suleyman(20)
Yayınlar
- MakaleAçık Erişim2024Investigation of Flower, Leaf, and Stem Parts of Three Gundelia Species Growth in the Eastern Anatolia Region of Türkiye from a Biochemical Perspective
Yilmaz, Fatih; Türkoglu, Ismail; Kirmizikaya Özmen, Gorkem; Yüce Babacan, Ebru; Yilmaz, Okkes
13 species of Gundelia species plants are endemic in T & uuml;rkiye and are frequently used by the public for both nutrition and medicinal objectives. In this study, three parts (flower, leaf, and stem) of three species of Gundelia ( G.dersim , G.glabra, and G.munzurensis) were biochemically investigated. DPPH and ABTS analyses for antioxidant activity were performed on methanol extracts of plant parts. As a result of both analyses in parallel, the flower part of G.munzurensis had the highest %Inhibition value (DPPH:91.85 +/- 0.78; ABTS:97.38 +/- 0) (P<0.001). In total phenolic (29.09 mg GAE/g) and total flavonoid (5.59 mg CE/g) measurements, the highest amount was found statistically quite significant (P<0.001) in the leaf part of G.munzurensis. Gallic, vanillic, ferulic, romantic, and cinnamic acids, which are phenolic acids and of the flavonoids, rutin, catechin, naringin, and naringenin, were determined in all plant parts. Vitamin D3, alpha-tocopherol, ergosterol, stigmasterol, and beta-sterol were detected in parts of all plant species. While palmitic (16:0), palmitoleic (16:1), stearic (18:0), oleic (18:1), linoleic (18:2), and linolenic (18:3) fatty acids as the main fatty acids were detected in all parts of the three Gundelia species, lauric (12:0), tridecanoic (13:0), myristic (14:0), pentadecanoic (15:0), cis-10-pentadecanoic (15:1), heptadecanoic (17:0), cis-10heptadecanoic (17:1), and eicosanoid (21:0) acids were also identified at different concentrations. Considering the biochemical properties of Gundelia species, it shows that they can be consumed as food and also used pharmacologically.
AtıfOpenAlex1
İncele - MakaleAçık Erişim2024Geochemical and petrological features of Carboniferous granites from the Güneydere (Bayburt) area
Gücer, Mehmet Ali; Delimehmet, Zeynep; Çimen, Okay
Middle-Late Carboniferousgranitic rocks are widely observed in larger outcrops in the Eastern Pontide orogenic belt of the Eastern Sakarya Zone. This tectonic belt is an important part of the Anatolian plate in terms of containing igneous rocks with a wide age and composition range. This study presents new petrochemical-petrological data on Carboniferous granites in the G & uuml;neydere and surrounding area of Bayburt (NE Turkey). The granitic rocks, which include an area of approximately 5 km, represent the pre-Jurassic basement in the study area. Besides, they are unconformably overlain by Early- Middle Jurassic volcano-clastics units and Late Jurassic- Early Cretaceous limestones. They mainly consist ofgranite, granite porphyry and aplite, to a lesser extent granodiorite and quartz monzonite. Rocks have high SiO2 contents (60.43-75.51%) and high K calc-alkali to shoshonitic affinities and have been derived from an I-type source. The granitic rocks are metalumine-peralumine in character and are similar to postcollisional volcanic arc granitoids. Whole-rocks major and trace element trends show that plagioclase, hornblende, biotite, apatite, and Fe-Ti oxide mineral fractionations play an important role in the formation of the rocks. It has been revealed that fractional crystallization and assimilation+magma mixing processes play a role in the development of granites. Also, the saturation temperatures calculated from the whole-rock zircon values reflect lower initial magma temperatures. All results obtained indicate that parental magma of studied granitic rocks have evolved from lower/middle crust- derived melts as a result of partial melting and differentiated and emplaced in the continental magma chamber.
AtıfOpenAlex1İncele - MakaleYalnız künye2024IS SCHOOL AUTONOMY EFFECTIVE FOR SUSTAINABLE ACADEMIC ACHIEVEMENT? PISA EXAM SAMPLE
Çankaya, Ibrahim; Balikçi, Servet
This study compares whether there is a significant difference between the PISA averages of countries with strong school autonomy and countries with weak school autonomy. The study is a mixed research method study. The study group was selected from OECD countries with strong and weak school autonomy using a counter-sampling technique. The five OECD countries with the strongest school autonomy are Finland, Netherlands, Czech Republic, UK and Estonia. The five OECD countries with the weakest school autonomy are France, Spain, Greece, Turkey and Mexico. In all PISA exams between 2006 and 2022, there is a significant difference (p<.05) between countries with strong school autonomy and countries with weak school autonomy in the mean scores of math, science and reading. In countries with strong school autonomy, the levels of school self-determination and parental involvement in lifelong learning activities are higher than the OECD average. Countries with weak school autonomy, this rates are below the OECD average. In countries with strong school autonomy, teacher-administration collaboration, teamwork in school, student monitoring, and teacher participation in professional development activities are mandated by school management or required by law.
- MakaleAçık Erişim2024Volatility Modeling and Spillover: The Turkish and Russian Stock Markets
Gençyürek, Ahmet Galip
This study investigates the internal and external (spillover) characteristics of the volatility of the Turkish and Russian stock market indices. To this end, generalized autoregressive conditional heteroskedasticity models that are classified as short memory (GARCH, EGARCH, GJR-GARCH, APARCH) and long memory (FIGARCH, FIEGARCH, FIAPARCH, HYGARCH) considering adaptive structure (Fourier series), and the rolling Hong causality methods are used. The analysis spans the years 2003-2020, revealing that the asymmetric power autoregressive conditional heteroskedasticity model is the most appropriate method in terms of both stock indices and leverage and long memory effects are evident in the volatility series. Bidirectional volatility spillovers between Turkish and Russian stock market indices are also evident in all time horizons. Investors can use volatility results for stock valuation, risk management, portfolio diversification, and hedging, and policymakers can consider the volatility results to evaluate the fragility of financial markets.
AtıfOpenAlex2TR Dizin2İncele - MakaleAçık Erişim2024Scopus SJRQ2Seed content and its oil composition in walnut cultivated from Tunceli, Türkiye
Aydin, Caglar Mert; Güven, Alper
The study is intended to shed light on walnut species cultivated in Tunceli province in 2022 and the oils produced from Juglans regia Fernor walnuts. Physicochemical properties of walnuts and fatty acid composition of the oils produced from the walnuts were identified. In addition, nutritional indexes and bioactive compounds of the oils were determined.Overall, physicochemical properties of the seeds belonging to walnuts significantly changed according to the variety. The major component in walnut seeds was found to be oil content. Saturated (SFA), monounsaturated (MUFA) and polyunsaturated (PUFA) fatty acid ratios of the walnuts were varied according to the type of seed. Characterization of fatty acid composition in the oils from the walnuts was performed according to 6 different fatty acid levels. These fatty acids are myristic, palmitic, margaric, oleic, linoleic and linolenic acid. The oils have a refractive index being in the range of 1.4677-1.4694, the iodine value being in the range of 107-109 gms. TPC (total phenolic content) and DPPH antioxidant activity of the oils significantly changed according to the variety. TPC of the oils were found in the range of 0.33-1.53 mg GAE/g oil and DPPH antioxidant activity of the oils were in the range of 13.04-5.42 mg TE g(-1) oil. All walnut oils showed Newtonian flow behavior. The nutritional indexes including UI (Unsaturation index), IA (Atherogenicity index), IT (Thrombogenicity index) and HH (Hypocholesterolemic/hypercholesterolemic ratio) were determined to significantly change according to the variety, except for IT. It could be stated from the results that Nazimiye walnut seed oil has healthier effects on human health.
AtıfOpenAlex3İncele - MakaleAçık Erişim2024AESTHETIZED TRAGEDY OR ANGEL WING ILLUSTRATIONS
Demirkiran, Uyesi Yalcin
The main purpose of this research is shaped by the argument that in social tragic events, the representations of tragedy encountered in the media are aestheticized and transformed into consumer goods. The tragic photograph of a father who did not let go of his daughter's hand under the rubble, which emerged especially after the earthquake disaster in our country, turned into a commodity produced and consumed both in traditional media and social media, determined the direction of the research. In the literature review, similar reflexes were found not only in natural disasters but also in dramatic images created by war and forced migration, which were chosen as samples, and were evaluated within the scope of the research. In the method of the research, the concept of tragedy is discussed through the change of reality as hyperreal in the world that has turned into a simulation universe, with a literature review. Based on Baudrillards' simulation theory, the meaning created by the transformation of tragedy into hyperreal tragedy has been tried to be interpreted. In the section of the study, From Traditional Tragedy to Tragedy in Everyday Language, the historical origin and general lines of the concept of tragedy have been tried to be explained through examples. The similarities and differences between the meaning of the historical origin of the tragedy and the definition of the concept of tragedy used in the everyday language of the modern world are mentioned. In the section of Tragedy as a Simulacrum, the subject is the reproduction of the tragedy with illustrations and pictures by individual users, not only in conventional media, but also in social media. In the research, the tragic images of war, forced migration and earthquake, which cause social tragedies, were examined through selected visual examples of the way artists and social media users were handled. Based on these visual examples, the distortion and abuse of the concept of tragedy has been tried to be explained.
- MakaleYalnız künye2024Scopus SJRQ3Biosynthesis of silver nanoparticles using the aqueous extract of Rheum ribes, characterization and the evaluation of its toxicity on HUVECs and Artemia salina
Unal, Ilkay; Egri, Sinan
This study describes an eco-friendly procedure to synthesize silver nanoparticles (AgNPs) using fresh and dried stem extract of Rheum ribes. AgNPs formation was confirmed using UV-vis spectrometry. The effects of parameters such as temperature, reaction time, pH, AgNO3 concentration, and plant extract/AgNO3 ratio on NP formation were evaluated. Morphology and structural features of the particles were characterized using SEM, TEM, XRD, and FTIR. The average size, polydispersity index, and zeta potential were determined using DLS. After characterization, among the two AgNP samples, selected one; AgNP sample synthesized by dried Rheum ribes stem extracts (d-AgNPs), which exhibited narrow size distribution and high surface plasmon resonance in the range of 435-445 nm for toxicity assessment. The cytotoxic effect of d-AgNPs on HUVECs cells was evaluated with MTT analysis. Accumulation measurements were made in three periods as 24, 48, and 72 h and elimination values were examined at +24 h using ICP-MS analysis
AtıfWoS6OpenAlex6İncele - MakaleYalnız künye2024THREE BRYOPHYTE SPECIES NEW TO TURKIYE AND SOUTHWEST ASIA
Batan, Nevzat; Erata, Huseyin; Ezer, Tulay; Alatas, Mevlut
- MakaleAçık Erişim2024ASSESSMENT OF URBAN FLOOD RISKS OF THE CITIES USING ENTROPY-VIKOR METHODS IN TURKIYE
Derse, Onur; Polat, Elifcan Gocmen
In recent years, there is growing interest for evaluation of urban flood risks of cities over the past decade due to rapid urbanization and climate change. The optimal flood risk assessment is strategically achieved not only with classical risk modelling approaches but also with holistic and comprehensive framework. This paper focuses on a detailed flood assessment providing risk database for policymakers and urban planners to decide the flood prone areas in Turkey. In this context, the Entropy based VIKOR (VIseKriterijumska Optimizacija Kompromisno Resenje) was provided to evaluate a range of flood risk criteria named number of floods, population density and number of buildings, flood protection area which are under the concept of risk dimension including hazard, exposure and vulnerability aspects. Computational results demonstrate that the provinces of & Scedil;anl & imath;urfa, Ordu, Zonguldak and Van are assigned with higher urban risk values, respectively and the ranking of the cities was presented with different q values. The findings should support practitioners and researchers for land use planning and risk reduction works as the detailed flood risk evaluation was presented in terms of the flood management.
AtıfWoS4OpenAlex5İncele - MakaleAçık Erişim2024Anti-inflammatory activity of a novel lectin isolated from Pleurotus eryngii var. ferulae mushroom
Seliman, Thoiba Mogahid Hussein; Ülbegi, Gulsum Altiparmak; Ozsoy, Nurten; Kavlo, Hevidar Alp; Sagirli, Pinar Aksoy
Background and Aims: Pleurotus species are edible mushrooms with important economic and medicinal value. Many pharmacological properties of these species, such as anticancer, immunomodulating, and anti-inflammatory activities, have been attributed to lectin. The aim of this study was to purify a novel lectin from Pleurotus eryngii var. ferulae (PEFL) and investigate its anti-inflammatory activity. Methods: PEFL was purified by 80% ammonium sulphate fractionation, diethylaminoethyl (DEAE)-Sepharose-4B anion exchange, and Sephadex G-100 gel filtration chromatography. The molar mass of the purified lectin was determined by sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE) under denaturing conditions. Inhibition of lectin-induced haemagglutination by several carbohydrates and one glycoprotein (ovalbumin) was also performed using the haemagglutination inhibition activity test. The anti-inflammatory effect of PEFL was tested in a lipopolysaccharide (LPS)-induced inflammation model in mouse macrophage cells (RAW 264.7). The levels of prostaglandin (PG)-E2, tumour necrosis factor-alpha (TNF-alpha), interleukin1-beta (IL-1 beta), interleukin-6 (IL-6), interleukin-10 (IL-10), and interferon-gamma (IFN-gamma) were determined using enzyme-linked immunosorbent assay (ELISA) kits. Furthermore, the expression of nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) was estimated by western blot analysis. Results: PEFL was obtained in 16% yield. The specific activity of PEFL was calculated as 1280 haemagglutinating units (HU)/mg protein and was inhibited only by D-galactose. The molecular weight was determined to be 46 kDa. PEFL showed an anti-inflammatory effect by reducing the production of pro-inflammatory PGs through COX-2 inhibition, as well as reducing iNOS expression. Furthermore, our findings reported that PEFL has a protective effect on inflammation by decreasing the production of pro-inflammatory cytokines and increasing the production of the anti-inflammatory cytokine (IL-10). Conclusion: The results suggest that PEFL can be considered as a potential therapeutic agent in the development of new therapeutic strategies for inflammatory diseases.
AtıfWoS1OpenAlex2İncele - MakaleAçık Erişim2024An Exploratory Study on the Application of Blockchain Technology to the Chinese Ship Auction Market
Peng, Chen; Alatas, Bilal
The Chinese ship trading market has undergone remarkable development, transitioning into a global exemplar of ship transactions. Nevertheless, this market continues to confront a series of challenges, encompassing low transaction rates, delayed transaction values, and market instability. Blockchain, with its secure, transparent, and tamper-resistant technological features, presents a potential solution for the ship trading market. Through its decentralized architecture, blockchain technology can reduce platform operational costs, enhancing market competitiveness. Concurrently, the utilization of asymmetric encryption technology can enhance the security of platform data, effectively addressing privacy concerns. Furthermore, through a sharing mechanism, blockchain can aid in establishing a unified credit evaluation system, thereby increasing market trust to address the absence of a credit evaluation system. Moreover, blockchain technology can be employed to construct a risk identification mechanism, fortifying the platform's regulatory model to address regulatory deficiencies.
AtıfWoS1OpenAlex2İncele - MakaleAçık Erişim2024Effect ofthe Practice of Guided Imagery on the Perceived Stress Level in High-Risk Pregnancies
Dal, Nursel Alp; Beydag, Kerime Derya; Dogan, Aysel
Objective: This research was conducted to identify the effect of the practice of Guided Imagery on the perceived stress level in high-risk pregnancies. Methods: The study was designed as a prospective, randomized, and single-blind study. The research was performed with the participation of a total of 128 women (64 in the experimental group, 64 in the control group) who had high-risk pregnancies between February-May, 2021. The data were evaluated with the Perceived Stress Scale. Results: The experimental group obtained a lower mean of post -test scores (26.36 +/- 5.96) from the Perceived Stress Scale than the control group (30.48 +/- 3.93), and this difference was statistically significant (p<.05). Also, the experimental group obtained lower mean scores from the Perceived Stress Scale in the post -test phase than the one in the pretest phase, and this difference was statistically significant (p<.05). Conclusion: Nurses and midwives should include the practice of Guided Imagery in the care processes to reduce the stress levels of women with high-risk pregnancies.
AtıfWoS1OpenAlex3İncele - MakaleAçık Erişim2024Role of Gate Type in the Air-Demand Ratio in Closed Conduits
Aydin, A. B.; Baylar, A.; Ozkan, F.; Tuna, M. C.; Ozturk, Mualla
Sluice and radial gates are common devices used to control flow in closed conduits. In high-head gated conduits, the high-velocity flow exiting the gate drags and entrains a lot of air. If the air demand of the flow is not met, the pressure drop downstream of the gate will cause structural damage or cavitation. Typically, an air vent is installed immediately downstream of the gate to supply sufficient air to the flow. In this study, the effect of the conduit gate type on the air-demand ratio was investigated. The results showed that the gate type had a very significant effect on the air-demand ratio. Significantly higher air-demand ratios were observed in the conduit with a sluice gate compared to the conduit with a radial gate. The results obtained will be useful in future modeling and design processes.
AtıfWoS1OpenAlex1İncele - MakaleAçık Erişim2024Scopus SJRQ1Mechanical, wear and thermal properties of natural fiber-reinforced epoxy composite: cotton, sisal, coir and wool fibers
Tasgin, Yahya; Demircan, Gokhan; Kandemir, Seckin; Acikgoz, Abuzer
Natural fiber-reinforced epoxy composites (NFRCs) have gained significant attention in recent years due to their potential as environmentally friendly and sustainable materials. These composites combine natural fibers, derived from plants, with epoxy resins to create a material with enhanced properties. The objective of this study is to investigate the mechanical, wear and thermal properties of NFRCs incorporating cotton, sisal, coir and wool fibers. The vacuum-assisted resin transfer molding (VARTM) technique was employed to produce composite plates, followed by conducting tests on tensile, wear and thermal properties. The cotton composite showcased the highest tensile strength, reaching 52.81 MPa, while the coir composite exhibited the lowest, measuring 15.34 MPa. Sisal composite exhibited a moderate wear rate (1.423 mm3/Nm) and a lower coefficient of friction (0.233), implying smoother relative motion. Coir composite presented the highest wear rate (4.615 mm3/Nm), attributed to its coarse fiber nature. Thermal conductivity is highest at cotton composite (1.017 W/mK) and is lowest at coir composite (0.187 W/mK). Additionally, the highest specific heat was observed in the coir composite (26.313 MJ/m3K). Cotton demonstrated potential for efficient heat transfer, while wool outperformed in insulation. Sisal displayed versatility for structural applications. Coir emerged as an effective insulator with energy-saving applications.
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İncele - MakaleYalnız künye2024Scopus SJRQ2Deep learning-assisted Hubble parameter analysis
Salti, Mehmet; Kangal, Evrim Ersin; Zengin, Bilgin
We turn our attention on evaluating the most recent Hubble parameter data measured via the differential evolution of cosmic-chronometers from a deep learning perspective. To achieve this goal, we start our investigation by introducing the selected theoretical setup and compiling the most recent statistical data obtained in cosmology experiments. Then we implement a tuned version of the long-short term memory (LSTM) architecture and run it to predict possible values of the Cosmic Hubble parameter for different red-shift states. Since we observe a good correlation between the observed and predicted datasets of the Hubble parameter, we conclude that the machine learning approaches can play important roles in the future cosmology investigations.
AtıfScopus2WoS2OpenAlex2İncele - MakaleYalnız künye2024Scopus SJRQ1The effect of high entropy oxide on radiation shielding parameters of erbium oxide doped glasses
Kanca, M. Sait; Taşgın, Yahya; Yılmaz, Demet; Pathman, Abdul Fatah; Güler, Ömer
High-entropy materials are one of the most studied topics in recent years due to the extraordinary properties they exhibit. High entropy oxide (HEO) is a group of materials that have been studied for different applications. However, the effects of HEOs on the radiation properties of glasses are not well known. In this study, the structural, radiation and neutron shielding properties of SiO2 glass systems doped erbium oxide reinforced with refractory high entropy oxide (RHEO) with the formula TiMoNbTaWZrO11 were investigated. RHEAs used in the study were produced and characterized in our laboratory. Then, they were added to the glass samples at different rates together with Erbium oxide. As a result of SEM-EDS and XRD analyses, it was determined that the additives were distributed very homogeneously on the glass. The composition of glass systems is [95SiO2+(5-x)Er2O3+x TiMoNbTaWZrO11], where (x = 0, 0.5, 1 and 2 %, mol). The linear and mass attenuation coefficients (LAC and MAC), mean free path (MFP), half-value layer (HVL) and effective atomic numbers (Zeff) and effective electron density (Nel) of the glass structures were experimentally measured at the energy region of 53.16–661.62 keV. Also, the equivalent dose rates due to fast neutrons absorption were measured by using an 241Am–Be fast neutron source. Exposure buildup factor (EBF) and fast neutron removal cross section (ΣR) were theoretically determined. The proton and alpha shielding parameters of glasses were calculated. It is observed that glasses containing higher amounts of refractory high entropy oxide, within the SiO2–Er2O3 composition, demonstrated enhanced capabilities for shielding against radiation and neutrons.
AtıfScopus15WoS15OpenAlex17İncele - MakaleYalnız künye2024Scopus SJRQ1Nutrification and fat reduction of deep-fried protein isolates
Erol, Nida Demirtas; Cakli, Sukran; Szymczak, Mariusz; Shen, Cangliang; Matak, Kristen E.; Jaczynski, Jacek
Deep-fried (DF) foods are considered nutritionally-inferior due to increased fat content, although they are popular with consumers due to desirable sensory characteristics. This study attempted to reduce fat of DF surimi, DF fish-protein-isolate (FPI), and DF chicken-protein-isolate (CPI) by pre-baking or pre-roasting. Surimi, FPI, and CPI were also nutrified with ω-3-rich oil, fiber, and KCl-based salt substitute. Pre-baking decreased (p < 0.05) fat content, while pre-roasting increased (p < 0.05) it. Pre-baking resulted in less (p < 0.05) changes to cook loss, moisture loss, expressible moisture, water-holding-capacity, whiteness, and texture when compared to pre-roasting. Pre-baking also better maintained ω-3 PUFAs concentration than pre-roasting, resulting in higher (p < 0.05) concentration of α-linolenic (ALA, 18:3ω3), eicosapentaenoic (EPA, 20:5ω3), and docosahexaenoic (DHA, 22:6ω3) FAs as well as unsaturated FAs and total ω-3 FAs in DF surimi, DF FPI, and DF CPI. Pre-baking in combination with nutrification using ω-3 PUFAs improved nutritional value of DF foods, while causing minimal quality changes.
AtıfScopus3WoS3OpenAlex3
İncele - MakaleAçık Erişim2024Scopus SJRQ2Effects of Ga, Nb, V, Zr, and Cr on the crystal structures and thermal behavior of CuAlMn shape memory alloys
Özkul, İskender; Karaduman, Oktay; Canbay, Canan Aksu
CuAlMn alloys are cheaper and more promising alloy types compared to NiTi alloys. In this study, based on CuAlMn shape memory alloy, thermodynamic and structural characteristics of some new alloys containing four elements were investigated in detail. In this study, five new quaternary shape memory alloys, each containing a CuAlMn base alloy and a different fourth additive element (Ga, Nb, V, Zr, and Cr), were produced. The properties of the obtained alloys were characterized using a series of analysis methods such as X-ray diffraction (XRD), optical microscopy, differential scanning calorimetry (DSC), and differential thermal analysis (DTA). The results showed the effects of different elements on the crystal structures of the alloys and how different elements could change the thermal behavior of the alloys.
AtıfScopus4WoS3OpenAlex6İncele - MakaleAçık Erişim2024Scopus SJRQ2Is Cladophora fracta an efficient tool of accumulating critical raw materials from wastewater and there a potential health risk of use of algae as organic fertilizer?
Arslan Topal, E. Işıl; Öbek, Erdal; Topal, Murat
In this study investigation of accumulations of critical raw materials (cobalt (Co), antimony (Sb), vanadium (V), lanthanum (La) and tungsten (W)) from wastewater by using C. fracta were aimed. Besides, assessment of the potential health risks in terms of the use of organic fertilizer obtained from the macroalga to be harvested from the treatment were also aimed. Highest Co, Sb, V, La and W accumulations by algae in reactor were 125±6.2%, 201.25±10%, 318.18±15%, 357.97±18%, and 500±25%, respectively. When compared with control, Co, Sb, V, La and W in algae increased 2.25, 3.01, 4.18, 4.58, and 6 times, respectively. The algae was very high bioaccumulative for Co and La. Highest MPI was calculated as 3.94. Non-carcinogenic risk of CRMs according to different exposure types (ingestion, inhalation, and dermal) were calculated for man, woman and child. There is not any non-carcinogenic risk from the investigated exposure ways of algae as organic fertilizer.
AtıfScopus2WoS2OpenAlex2İncele - MakaleYalnız künye2024Scopus SJRQ2Synthesis and characterization of TiNbZrMo medium-entropy bio-composites: Microstructure, mechanical properties, and in vitro degradation
Say, Yakup
This study reports the synthesis and characterization of hydroxyapatite (HA)-based bio-composites reinforced with varying amounts (by weight, 1–15 wt.%) of bio-medium entropy alloy (BioMEA) for load-bearing implant applications. BioMEA powders consisting of Ti, Nb, Zr, and Mo were mechanically alloyed for 100 h and subsequently added to HA using powder metallurgy techniques. To show the effect of BioMEA, the microstructure, density, and mechanical tests have been conducted and the synthesized BioMEA was characterized by scanning electron microscope (SEM), x-ray diffractometer (XRD), and Fourier-transform infrared spectroscopy (FTIR) analysis. In addition, in vitro degradation behavior and bioactivity analyses of bio-composites have been conducted. XRD analysis revealed the formation of BioMEA after 20 h of mechanical alloying. The highest density value of 2.47 g/cm3 was found in 15 wt.% BioMEA-reinforced bio-composite. The addition of BioMEA reinforcement led to a significant increase in hardness and tensile strength values, with the highest values observed at 15 wt.% reinforcement. Compression tests demonstrated a significant increase in compressive strength and deformation capability of the bio-composites with the highest values observed at 15 wt.% BioMEA addition. The highest toughness of 7.68 kJ/m2 was measured in 10 wt.% MEA-reinforced bio-composites. The produced bio-composite materials have an elastic modulus between 3.5–5.5 GPa, which may provide a solution to the stress shielding problems caused by the high elastic modulus of metallic implant materials. The most severe degradation occurred in 15 wt.% MEA-reinforced bio-composites, and the effect of degradation caused a decrease in Ca and an increase in Ti-Ni-Zr-Mo in all bio-composites. These findings suggest that HA/BioMEA bio-composites have the potential to be developed as advanced biomaterials with moderate mechanical and biological properties for load-bearing implant applications.
AtıfScopus2WoS1OpenAlex3İncele