DSpace@ATÜ (Adana Alparslan Türkeş Bilim ve Teknoloji Universiti)
Not a member yet
3463 research outputs found
Sort by
Petrogenesis of Miocene volcanism in the Central Anatolia: Geochemical, isotopic and geochronological evidence
No full textThis paper presents the first 40 Ar/ 39 Ar age data, new bulk -rock major -trace element compositions and Nd - Sr isotope geochemistry, combined with detailed geological mapping of Galatia Volcanic Province (GVP) in the northwest Central Anatolia (Turkey). Here, there are voluminous extrusive rocks in a wide compositional range: a basalt, andesite and trachyte suite, and their pyroclastic equivalents. 40 Ar/ 39 Ar dating of two whole-rock samples from the GVP yielded plateau ages of 21.76 +/- 0.8 Ma and 20.97 +/- 0.5 Ma, constrain the volcanic activity at ca. 21 Ma (Aquitanian). The samples show by sub-parallel light rare earth element (LREE)-enrichment and relatively flat heavy rare earth element (HREE) patterns and moderate fractionation [average (La/Yb) N = 13.5]. Their initial 87/86 Sr values vary between 0.704619 and 0.704998, while initial 143/144 Nd values lie between 0.512673 and 0.512755. Integration of the geochemical and geochronological with geological data we propose that the volcanic rocks in the northern area of GVP with calc-alkaline affinity were produced by a lithospheric mantle magma in an extensional setting.Istanbul Technical Uni- versity (ITU-BAP)The first author received financial support Istanbul Technical Uni- versity (ITU-BAP) . The authors are grateful to editor and two anony- mous reviewers for excellent suggestions and critical comments, which improved the scientific content
UAVs-FFDB: A high-resolution dataset for advancing forest fire detection and monitoring using unmanned aerial vehicles (UAVs)
No full textForest ecosystems face increasing wildfire threats, demanding prompt and precise detection methods to ensure efficient fire control. However, real-time forest fire data accessibility and timeliness require improvement. Our study addresses the challenge through the introduction of the Unmanned Aerial Vehicles (UAVs) based forest fire database (UAVs-FFDB), characterized by a dual composition. Firstly, it encompasses a collection of 1653 high-resolution RGB raw images meticulously captured utilizing a standard S500 quadcopter frame in conjunction with a RaspiCamV2 camera. Secondly, the database incorporates augmented data, culminating in a total of 15560 images, thereby enhancing the diversity and comprehensiveness of the dataset. These images were captured within a forested area adjacent to Adana Alparslan Türkeş Science and Technology University in Adana, Turkey. Each raw image in the dataset spans dimensions from 353 × 314 to 640 × 480, while augmented data ranges from 398 × 358 to 640 × 480, resulting in a total dataset size of 692 MB for the raw data subset. In contrast, the augmented data subset accounts for a considerably larger size, totaling 6.76 GB. The raw images are obtained during a UAV surveillance mission, with the camera precisely angled a -180-degree to be horizontal to the ground. The images are taken from altitudes alternating between 5 - 15 meters to diversify the field of vision and to build a more inclusive database. During the surveillance operation, the UAV speed is 2 m/s on average. Following this, the dataset underwent meticulous annotation using the advanced annotation platform, Makesense.ai, enabling accurate demarcation of fire boundaries. This resource equips researchers with the necessary data infrastructure to develop innovative methodologies for early fire detection and continuous monitoring, enhancing efforts to protect ecosystems and human lives while promoting sustainable forest management practices. Additionally, the UAVs-FFDB dataset serves as a foundational cornerstone for the advancement and refinement of state-of-the-art AI-based methodologies, aiming to automate fire classification, recognition, detection, and segmentation tasks with unparalleled precision and efficacy. © 2024 The Author(s)Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, TÜBİTAK, (123M222); Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, TÜBİTA
Green synthesis of silver nanoparticles using carob leaf extract: Characterization and analysis of toxic effects in model organism Galleria mellonella L. (The greater wax moth)
No full textSilver nanoparticles (Ag NPs) have been used in many studies due to their inhibitory properties on microorganisms such as bacteria and viruses. In recent years, due to global problems such as environmental pollution, the green synthesis (biosynthesis) method is frequently preferred because it is simple and low cost and does not require the use of toxic substances. The aim of this study is to synthesize silver nanoparticles (Ag NPs) from Ceratonia siliqua L. leaves and investigate their antioxidant and immunotoxic properties using Galleria mellonella last instar larvae. The UV spectrophotometer, TEM, XRD and FTIR measurements were used to characterize the Ag NPs. In this study, it was determined that the effects on antioxidant enzyme activities (SOD, CAT, GPx, GST), acetylcholinesterase (AChE) and total hemocyte count (THC) as well as phenoloxidase activity determine their effect on antioxidant defence and the immune system in model organism G. mellonella larvae. We observed that green synthesized Ag NPs accumulate in the midgut of the larvae and led to the increasing of CAT and SOD activities. GST and AChE activities were increased in the fat body of the larvae; otherwise, it was decreased in the midgut. Moreover, increases were found in THC and phenoloxidase activity. Consequently, green synthesized silver nanoparticles led to oxidative stress and immunotoxic effects on G. mellonella larvae. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024
Assessing the Carbon Footprint of Plastic Bottle Blow Mold Based on Product Life Cycle for Managing the Mold Industry's Carbon Emission
No full textCalculating the carbon footprint (CF) holds paramount importance in today's world as it provides a tangible measure of our impact on the environment. In the corporate realm, businesses armed with CF data can optimize operations, reduce waste, and adopt greener technologies, leading to both environmental and economic benefits. In this study, carbon emissions-a significant global issue-are investigated through the lens of the ISO 14067-ISO Product Based Carbon Footprint (CF) standard, focusing on the operations of a mold company. The primary innovation lies in meticulously tracing every stage of plastic bottle blow mold production, the most prevalent product in the mold industry, from its raw material input to its final form as a mold in the factory. Subsequently, detailed calculations and analysis are conducted to quantify the carbon footprint associated with this process and its impact on the environment. The calculated CF for one ton of PBBM produced by Petka Mold Industry is presented. This study fills a critical gap in the literature by providing a holistic understanding of the carbon footprint of plastic bottle blow mold (PBBM) production, thereby offering valuable insights for managing carbon emissions and promoting sustainability within the mold industry. By integrating a life cycle product carbon footprint thinking into industrial practices, a greener, more sustainable future can be paved, mitigating the ecological footprint of the PBBM.Petka Mold IndustryThe authors would like to acknowledge the Petka Mold Industry Design Center for full financial support and the data process
Particle Shape-Based Evaluation of the Leaching of Sphalerite Ore in Dilute Acid Solutions
No full textIn this study, the effects of changes in particle shapes on dissolution efficiencies in zinc (Zn) recovery from a lead-zinc (Pb-Zn) ore by acid leaching method were investigated. In the experiments with nitric acid (HNO3), sulfuric acid (H2SO4), and hydrochloric acid (HCl), particle size (75-106-150 µm), solids ratio (5-10-15-20-25%), leaching time (30-60-120-180-240 min), acid dosage (0.25-0.5-1-2-5 M) and pulp temperature (30-40-50-60-70 oC) parameters were analyzed. Optimum results were obtained under the conditions of 75 µm particle size, 15% solids ratio, 120 min leaching time, 0.5 M acid dosage, and 50°C pulp temperature for H2SO4; 106 µm particle size, 25% solids ratio, 60 min leaching time, 0.5 M acid dosage, and 70°C pulp temperature for HCl; 75 µm particle size, 20% solids ratio, 60 min leaching time, 1 M acid dosage, and 50°C pulp temperature for HNO3. As a consequence of the tests performed under these optimized conditions, 97.32%, 96.38% and 96.06% Zn dissolution efficiencies were obtained. Within the context of particle shape factor research, microscope images of the leaching residues were obtained from the experiments in which the pulp temperature, acid dosage, and leaching time parameters were examined. The samples obtained from the experiments with all three acids were compared with the ore samples, and the impacts of changes in circularity, roundness, and solidity values on dissolution efficiencies were interpreted
Wyzwania i mo?liwo?ci odzysku w gospodarce odpadami podczas procesów wydobycia i wzbogacania rud zawieraj?cych uran i tor – przegl?d
No full textDuring the extraction of nuclear raw materials, rare earths and other elements from ores containing uranium and thorium, various types of radioactive waste and some recovery tailings are generated. Mining and ore processing residues, i.e. waste and tailings, present a variety of problems related to waste management. Their bulky structure prevents their disposal underground, and their long radioactive half-life causes various problems with regard to their long-term storage. As a matter of fact, the secondary presence of nuclear raw materials together with other minerals requires compliance with hazardous waste procedures in the storage of waste containing nuclear raw materials after the recovery of these main minerals. It may be possible in the future to recover these nuclear raw materials from stockpiles of stored mine waste. The prospect of imbalances in the global uranium supply and demand increases the importance of secondary sources contributing to the global uranium supply. The increasing importance of secondary sources of nuclear raw materials suggests that more attention should be paid to the recovery of these resources together with primary minerals than in the past. In world literature, there is no review article that describes and discusses the waste management of nuclear raw materials in mining and mineral processing together with the opportunities and obstacles for their recovery. Considering this deficiency in the literature, in this study, the properties of waste and tailings resulting from mining and ore preparation activities of nuclear raw materials are explained, the difficulties encountered are mentioned, and solution suggestions are presented by making use of the literature on the recovery of tailings and waste management
Pterostilbene suppresses head and neck cancer cell proliferation via induction of apoptosis
No full textBackground/aim: Head and neck cancer (HNC) is one of the most prevalent causes of death worldwide, and so discovering anticancer agents for its treatment is very important. Pterostilbene (PS) is a trans-stilbene reported to be beneficial in managing various cancers. The objective of the study was to evaluate the cytotoxic, antiproliferative, proapoptotic, and antimigrative effect of PS on HEp-2, SCC-90, SCC-9, FaDu, and Detroit-551 cell lines. Materials and methods: MTT and live/dead assays were employed to assess cell viability, while a cell migration test was performed to evaluate wound healing capacity. The mRNA, protein, and intracellular expression levels of CASP-3, BAX, and BCL-2 genes were evaluated by real-time PCR, western blotting, and immunofluorescence staining. Annexin V-PI staining was conducted to assess the amounts of viable, apoptotic, and necrotic cells. Results: The results revealed that PS displayed cytotoxic, antiproliferative activity in a dose-dependent manner in HNC cells by upregulating CASP-3 and BCL-2 while downregulating BCL-2 in the apoptotic pathway. The proapoptotic properties were confirmed by the annexin-V-IP results. Moreover, PS displayed a significant suppressive efficacy on the migration capacity of HNC cells. Conclusion: The present study provides proof that PS has the prospective to be improved as an attractive anticancer agent against HNC following advanced studies.Health Institutes of Turkiye (TUSEB) [11912]; Adana Alparslan Tuerkescedil; Science and Technology University Scientific Research Projects Coordination Unit; Adana Alparslan Turkes Science and Technology University Scientific Research Projects Coordiation UnitThe study was financially supported by Health Institutes of Turkiye (TUSEB) (Project Number: 11912) and Adana Alparslan Turkes Science and Technology University Scientific Research Projects Coordination Unit (Project Number: 21103017)
Effects of EU-Compliant mining waste regulation on Turkish mining sector: A review of characterization, classification, storage, management, recovery of mineral wastes
No full textMining Waste Regulation in Turkiye entered into force on 15/07/2015. The important issues envisaged in the Regulation are as follows: Determination of waste characterization and collection of mineral wastes under three groups as hazardous waste, non-hazardous waste and inert waste, classification of mineral waste disposal facilities as Category A and Category B, regulations on the management of mineral wastes, waste recovery & financial guarantee. According to this regulation, the wastes generated as a result of mining activities; Although it is foreseen as hazardous waste, non-hazardous waste, or inert waste, most of the wastes generated as a result of mining activities are classified as hazardous waste and treated as industrial waste with the Regulation. Obligations that were previously required for the wastes of mines that only required cyanide or chemical treatment have now become desirable for almost all mining wastes with the entry into force of this new regulation. In Turkiye and the European Union, there are many legal regulations regarding wastes, including mining wastes. However, as in the EU, there are serious problems in the management of mining wastes in Turkiye. For this reason, the development of environmentally friendly mining needs to analyze the gaps and mistakes of the Turkish mining waste legislation, which is tried to be based on the EU legislation. Additionally, mineral waste recovery will contribute to the feasibility of mining operations. In this direction, this study has been prepared by reviewing studies published on mining waste legislation. This study discusses mine waste legislation in Turkiye by referring to a few EU regulations that have been taken as examples in the enactment of Mining Waste Regulations in Turkiye and in the enactment of regulations on waste prior to this regulation. The study includes information and discussions in the direction that the authorities that prepare and implement mining waste legislation in the world can benefit from. In line with the feasibility of mining investments, the suggestions of the mining industry and the doctrine on mining waste legislation are included
Electrochemical and semiconducting properties of multifunctional smart conductive fabrics based on polypyrrole
No full textWe have fabricated multifunctional conductive fabrics composed of polypyrrole/BaTiO3/poly(acrylonitrile-co-methylacrylate) (PPy/BaTiO3/P(AN-co-MA)(PBA) utilizing a simple process including dip coating and in situ chemical polymerization of pyrrole, which oxidized both ammonium persulfate (APS) and ammonium persulfate + iron (III) chloride (APS + FeCl3) for flexible and wearable textile applications. The influence of the oxidant nature, PPy content, and BaTiO3 on the surface structures, electrochemical, and semiconducting characteristics of the fabrics was examined using scanning electrochemical microscopy (SEM), electrochemical impedance spectroscopy (EIS), and the Mott-Schottky (M-S) studies. The study revealed that the size of the polymer nanostructures on fabric has an impact on the electrochemical impedance properties. Specifically, a decrease in diameter (when FeCl3 + APS is used) or the formation of more compact swelling surface structures (when only APS is used) is associated with changes in the conductivity of the coated fabric. Based on the EIS tests, the composite coating (S0.1, S0.2, and S0.3) with FeCl3 has a higher electrical conductivity compared to the coating with APS (PBA). The M-S tests indicate that the semiconducting characteristics of coated fabrics are dependent upon the kind of oxidant, the amount of PPy, and the presence of BaTiO3. The results of this study indicated that, poly(acrylonitrile-co-methylacrylate) acts as an important interfacial material to prevent the aggregation of BaTiO3 and the size of obtained nanostructures leads to variation in the electrochemical impedance properties, due to presence of ammonium persulfate and FeCl3 and also, depend on pyrrole content and BaTiO3, which is related to the change in conductivity of coated fabric. imageIstanbul Technical University Scientific Research Support FoundationNo Statement Availabl
Catalytic insights into methanol electrooxidation on Ni foam modified with Bi 2 O 3-Acetylene black-rGO: Synthesis, characterization, and performance evaluation
No full textThe aim of this study was to develop efficient anode materials for direct methanol fuel cell applications. The Ni foam was modified with Bi 2 O 3 - acetylene black-rGO to increase catalytic activity toward methanol oxidation. The Bi 2 O 3 was synthesized via a straightforward green technique. The characterization was achieved by using Fourier transform infrared spectroscopy and X -Ray diffraction analysis. The transmission electron microscope and field emission scanning electron microscope was utilized to evaluate the surface properties of catalysts, and energy-dispersive X-ray spectroscopy were employed to determine the chemical composition. Bi 2 O 3 particles with diameters ranging from 15 to 75 nm were crystal structures in the (111), (220), (311), and (342) crystal planes. The performance of methanol electrooxidation in an alkaline medium was investigated using cyclic voltammetry, electrochemical impedance spectroscopy and chronoamperometry techniques. The surface coverage of the redox species was 2.04 x 10 -5 mol g -1 , and the diffusion coefficient ranged between 8.02 x 10 -12 and 1.25 x 10 -13 cm 2 s - 1 . According to the obtained results, the Bi 2 O 3 - acetylene black-rGO modification enhanced the electrocatalytic activity of Ni foam against methanol oxidation in an alkaline medium.the work reported in this paper