TUBİTAK Adresli Yayınlar Topluluğu

2023 (v1) Dergi makalesi açık erişim

Development- and Validation-Improved Metrological Methods for the Determination of Inorganic Impurities and Ash Content from Biofuels

Stratulat, Camelia; Ginghina, Raluca Elena; Bratu, Adriana Elena; Isleyen, Alper; Tunc, Murat; Hafner-Vuk, Katarina; Frey, Anne Mette; Kjeldsen, Henrik; Vogl, Jochen;

In this study, five laboratories, namely, BRML (Romania), TUBITAK UME (Turkey), IMBIH (Bosnia and Herzegovina), BAM (Germany), and DTI (Denmark), developed and validated analytical procedures by ICP-MS, ICP-OES, MWP-AES, WD-XRF, and ID-MS for the determination of inorganic impurities in solid and liquid biofuels, established the budget of uncertainties, and developed the method for determining the amount of ash in the measurement range 0-1.2% with absolute repeatability less than 0.1% and absolute reproducibility of 0.2% (according to EN ISO...

June 7, 2024 tarihinde yüklendi.

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2023 (v1) Dergi makalesi açık erişim

Efficient and cost-effective determination of Cr(VI) ions using immobilized 4,5-dihydroxynaphthalene-2,7-disulfonic acid disodium salt dihydrate: a novel analytical reagent with high selectivity and sensitivity

Bobojonov, Bunyod; Madatov, Utkir; Usmanova, Xilola; Zulayho, Smanova; Ahmadjonov, Ulug'bek; Demir, Muslum; Berdimurodov, Elyor;

The determination of Cr(VI) ions in real-world samples is of utmost importance due to the critical role it plays in assessing and monitoring the levels of Cr(VI) contamination in water. The present study introduces a time-saving, cost-effective, selective, highly efficient and eco-friendly analytical reagent to detect Cr(VI) ions. This study presents fabrication of immobilised 4,5-dihydroxynaphthalene-2,7-disulfonic acid disodium salt dihydrate (DHNDSADNa) on a polyethylene-polyamine polyacrylonitrile (PPA) matrix for the determination of Cr...

June 7, 2024 tarihinde yüklendi.

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2023 (v1) Dergi makalesi açık erişim

The effects of heatwaves on hospital admissions in the Edirne province of Turkey: A cohort study

Ozturk, Yunus; Baltaci, Hakki; Akkoyunlu, Bulent Oktay;

Studies show that heat waves (HWs) are among the most important atmospheric phenomena that negatively affect human health. This study aims to determine the effects of HWs on hospital admissions (HA) in the Edirne province of Turkey. Polyclinic admission and atmospheric data, including daily maximum temperatures, were used. HW is defined as temperature at the % 90 threshold of daily maximum temperatures that persists for at least 3 consecutive days or more. With this definition, a 6-day HW was detected, and a lag of 3 days was added to this H...

June 7, 2024 tarihinde yüklendi.

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2023 (v1) Dergi makalesi açık erişim

Determination of combustion and emission characteristics of liquid Fischer-Tropsch diesel fuel synthesized from coal in a diesel engine

Hurpekli, Mersin; Ozsezen, Ahmet Necati;

Fischer-Tropsch (FT) synthesis is a production method that processes a liquid diesel fuel from heavy carboncontaining organic compounds such as coal and biomass. FT synthesis is an essential process in demonstrating the usability of coal-to-liquid fuel in internal combustion engines. This study investigates the effects of using FT diesel fuel synthesized from coal on the combustion characteristics of a single-cylinder common-rail directinjection diesel engine. The engine tests were conducted at 50% of the wide-open throttle position and fixe...

June 7, 2024 tarihinde yüklendi.

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2023 (v1) Dergi makalesi açık erişim

Preparation of TiO₂-diatomite composites and photocatalytic degradation of dye wastewater

Hocaoglu, S. M.; Mohamad Idris, A. I.; Basturk, I.; Partal, R.;

This study reveals the efficiency of Ti-hyflo, Ti-C535, and Ti-C560 diatomite-TiO2 composites prepared using the sol-gel method in degrading dye under UVc irradiation. Photocatalytic degradation of Rhodamine B dye solution (10 mg/L) was examined at pH 3 using varying lamp powers (6 W and 18 W) and TiO2-diatomite dosages (0.1 g/L, 0.2 g/L, and 0.4 g/L). The experiment included color removal analysis of a dilute dye bath of a textile industry. Photocatalytic degradation experiment results reveal a similar performance for Ti-C535 and Ti-C560 co...

June 7, 2024 tarihinde yüklendi.

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2023 (v1) Dergi makalesi açık erişim

Ranking Strategic Goals with Fuzzy Entropy Weighting and Fuzzy TOPSIS Methods: A Case of the Scientific and Technological Research Council of Turkiye

Ozturk, Betuel Cansu; Gokcen, Hadi;

This study involves an integrated approach consisting of the Fuzzy AEW Method which considers all relevant criteria and involves the contribution of all members of a strategic planning team in the determination of strategic goals as well as the Fuzzy Technique for Order Performance by Similarity to Ideal Solution (TOPSIS) method. The Fuzzy AEW method has been used in weighing the criteria whereas the Fuzzy TOPSIS method has been used in determining the order of the alternatives. This article presents a real-world case using this model in set...

June 7, 2024 tarihinde yüklendi.

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2023 (v1) Dergi makalesi açık erişim

A DDQ-mediated ring-opening and aromatization cascade of a tetrahydrocarbazole-fused tetrahydrofuran for the synthesis of olivacine

Dilek, Omer; Patir, Suleyman; Tilki, Tahir; Erturk, Erkan;

It is introduced that an N-MOM-tetrahydrocarbazole-fused synthesis of olivacine. Upon treatment with DDQ ring-opening, MOM-removal and aromatization in one already known precursor for olivacine. Besides, several of N-MOM-protected tetrahydrocarbazole-1-one with tetrahydrofuran with Red-Al, have been made good

June 7, 2024 tarihinde yüklendi.

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2023 (v1) Dergi makalesi açık erişim

Hydrogen sorption studies of palladium decorated graphene nanoplatelets and carbon samples

Erdogan, Fatma Oguz; Celik, Cenk; Turkmen, Anil Can; Sadak, Ali Enis; Cucu, Evren;

With the increasing population of the world, the need for energy resources is increasing rapidly due to the development of the industry. 88% of the world's energy needs are met from fossil fuels. Since there is a decrease in fossil fuel reserves and the fact that these fuels cause environmental pollution, there is an increase in the number of studies aimed to develop alternative energy sources nowadays. Hydrogen is considered to be a very important alternative energy source due to its some specific properties such as being abundant in nature...

June 7, 2024 tarihinde yüklendi.

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2023 (v1) Dergi makalesi açık erişim

Nutrient recovery from anaerobic digester supernatant using a fluidized-bed reactor

Kilic, Mervenur; Yilmaz, Tulay; Partal, Recep; Sik, Emrah; Dogan, Ozgur; Kitis, Mehmet; Sahinkaya, Erkan;

This study investigated nutrient recovery by struvite precipitation from anaerobic digester supernatant con-taining nitrogen and phosphorus at high concentrations using a fluidized-bed reactor. In the first phase, hydraulic retention time (HRT) in the system was reduced from 15 min to 2.5 min at molar Mg2+/NH4+/PO43  ratio of 1.5/ 16.6/1. No significant differences were detected and struvite could be precipitated at high performances even at an HRT of 2.5 min. In the second stage, the impact of Mg/P molar ratio on struvite precipitation per...

June 7, 2024 tarihinde yüklendi.

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2023 (v1) Dergi makalesi açık erişim

Alterations of growth, biofilm-forming, and gene expression of<i> Bordetella</i><i> pertussis</i> by antibiotics at sub-minimum inhibitory concentrations

Delik, Eda; Eroglu, Berfin; colak, Cigdem Yilmaz; Ozcelik, Aysun Turkanoglu; Ozturk, Burcu Emine Tefon;

Bordetella pertussis is the primary agent of the acute respiratory disease pertussis. It has been reported that the disease has recently become more common, especially in adults and adolescents, and adaptation of the pathogen is thought to have an important influence on the recurrence of the disease. This study aims to determine the effect of erythromycin, azithromycin, and trimethoprim-sulfamethoxazole used in the treatment of pertussis on the virulence gene expressions (prn, ptxS1, fhaB), biofilm-forming and growth of B. pertussis. In this...

June 7, 2024 tarihinde yüklendi.

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2023 (v1) Konferans bildirisi açık erişim

User Pairing and Beamforming Design in mmWave CR-NOMA Networks

Akyol, Omer Faruk; Basaran, Semiha Tedik; Hokelek, Ibrahim; Gorcin, Ali;

This paper presents the coexistence of two promising technologies for 5G and beyond mobile networks, namely Cognitive Radio-based Non-Orthogonal Multiple Access (CR-NOMA) and millimeter-wave (mmWave) wireless communication. The decoding performance of successive interference cancellation (SIC) significantly affects the coverage probability of the CR-NOMA network serving the primary and secondary users within a single frequency resource block. In this paper, we propose a user pairing algorithm to allocate primary and secondary users in an upl...

June 7, 2024 tarihinde yüklendi.

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2023 (v1) Dergi makalesi açık erişim

Machine Learning-Based Text Classification Comparison: Turkish Language Context

Alzoubi, Yehia Ibrahim; Topcu, Ahmet E.; Erkaya, Ahmed Enis;

The growth in textual data associated with the increased usage of online services and the simplicity of having access to these data has resulted in a rise in the number of text classification research papers. Text classification has a significant influence on several domains such as news categorization, the detection of spam content, and sentiment analysis. The classification of Turkish text is the focus of this work since only a few studies have been conducted in this context. We utilize data obtained from customers' inquiries that come to ...

June 7, 2024 tarihinde yüklendi.

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2024 (v1) Dergi makalesi açık erişim

Combining Step-Growth and Chain-Growth Polymerizations in One Pot: Light-Induced Fabrication of Conductive Nanoporous PEDOT-PCL Scaffold

Tabak, Tugberk; Kaya, Kerem; Isci, Recep; Ozturk, Turan; Yagci, Yusuf; Kiskan, Baris;

A novel method based on light-induced fabrication of a poly (3,4-ethylenedioxythiophene)-polycaprolactone (PEDOT-PCL) scaffold using phenacyl bromide (PAB) as a single-component photoinitiator is presented. HBr released from the step-growth polymerization of EDOT is utilized as an in situ catalyst for the chain-growth polymerization of & epsilon;-caprolactone. Detailed investigations disclose the formation of a self-assembled nanoporous electroconductive scaffold (1.2 mS cm-1). Fluorescence emission spectra of the fabricated scaffold exh...

June 7, 2024 tarihinde yüklendi.

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2023 (v1) Dergi makalesi açık erişim

Preparation and electrochemical properties of bimetallic carbide Fe₃Mo₃C/Mo₂C@carbon nanotubes as negative electrode material for supercapacitor

Hu, Rui Yang; Liu, Li Yuan; He, Jia Hao; Zhou, Yang; Wu, Shi Bo; Zheng, Mao Xiang; Demir, Muslum; Ma, Pian Pian;

The recent studies presented that bimetallic carbide is a potential electrode material for supercapacitors owing to its abundant active sites, high conductivity and high electrochemical stability. Besides, making composite of bimetallic carbides with other advanced physical, textural and morphological materials such as graphene, porous carbon or carbon nanotubes (CNTs) can critically enhance the electrochemical property of the electrode. In this work, Fe3Mo3C/Mo2C@CNTs composite material was for the first time prepared by hydrothermal and hi...

June 7, 2024 tarihinde yüklendi.

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2023 (v1) Dergi makalesi açık erişim

Magnetic Cu/Co nanoparticles supported on nitrogen-doped porous carbon derived from Cu/Co@aZIF: Investigation of catalytic activity and structural properties

Bugday, Nesrin; Yasar, Sedat; Altin, Serdar; Duygulu, Ozgur; Onal, Yunus;

By calcining copper-doped amorphous zeolitic imidazolate framework (Cu/Co@aZIF), a novel magnetic nanoporous carbon composite (Cu/Co@NPC) material was produced, characterized by different spectroscopic techniques, and used for the first time as an efficient catalyst for the azide-alkyne cycloaddition (AAC) reaction and the reduction reaction of nitrophenol (RRN) under air in water. With this catalyst, the AAC and RRN reactions were conducted in aqueous solutions, and good to excellent yields of related products were synthesized in a short re...

June 7, 2024 tarihinde yüklendi.

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2023 (v1) Dergi makalesi açık erişim

Changing material around (2060) Chiron revealed by an occultation on December 15, 2022

Ortiz, J. L.; Pereira, C. L.; Sicardy, B.; Braga-Ribas, F.; Takey, A.; Fouad, A. M.; Shaker, A. A.; Kaspi, S.; Brosch, N.; Kretlow, M.; Leiva, R.; Desmars, J.; Morgado, B. E.; Morales, N.; Vara-Lubiano, M.; Santos-Sanz, P.; Fernandez-Valenzuela, E.; Souami, D.; Duffard, R.; Rommel, F. L.;

We were able to accurately predict the shadow path and successfully observe an occultation of a bright star by Chiron on December 15, 2022. The Kottamia Astronomical Observatory in Egypt did not detect the occultation by the solid body, but we found three extinction features in the light curve that had symmetrical counterparts with respect to the central time of the occultation. One of the features is broad and shallow, whereas the other two features are sharper, with a maximum extinction of & SIM;25% at the achieved spatial resolution o...

June 7, 2024 tarihinde yüklendi.

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2023 (v1) Dergi makalesi açık erişim

Medical image diagnosis based on adaptive Hybrid Quantum CNN

Ajlouni, Naim; Ozyavas, Adem; Takaoglu, Mustafa; Takaoglu, Faruk; Ajlouni, Firas;

Hybrid quantum systems have shown promise in image classification by combining the strengths of both classical and quantum algorithms. These systems leverage the parallel processing power of quantum computers to perform complex computations while utilizing classical algorithms to handle the vast amounts of data involved in imaging. The hybrid approach is intended to improve accuracy and speed compared to traditional classical methods. Further research and development in this area can revolutionize the way medical images are classified and he...

June 7, 2024 tarihinde yüklendi.

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2023 (v1) Dergi makalesi açık erişim

Effects of turbulence and flamelet combustion modelling on the CFD simulation of a dual inlet ramjet combustor

Solmaz, Mehmet Burak; Uslu, Sitki;

This manuscript presents Computational Fluid Dynamics simulation of a ramjet combustor using Reynolds Averaged Navier-Stokes approach for turbulence with flamelet combustion modelling. In the approach a one-dimensional premixed flame simulation is performed to cover a wide range of mixture fraction space. After a mesh study, effects of turbulence, Realizable k-e and SST k-?, and combustion modelling, Steady Laminar Flamelet and Flamelet Generated Manifold, are investigated in detail. The Flamelet Generated Manifold model that offers a reacti...

June 7, 2024 tarihinde yüklendi.

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2023 (v1) Dergi makalesi açık erişim

Binder-free engineering design of Ni-MOF ultrathin sheet-like grown on PANI@GO decorated nickel foam as an electrode for in hydrogen evolution reaction and asymmetric supercapacitor

Amirabad, Tahereh Nikkhah; Ensafi, Ali A.; Mousaabadi, Kimia Zarean; Rezaei, B.; Demir, Muslum;

In this study, Ni3(benzene 1,3,5-tricarboxylic acid)@polyaniline-rGO nanocomposite (Ni-MOF@PANI-rGO) is fabricated by a two-step procedure involving polymerization and hy-drothermal operations. This nanocomposite-based Ni-MOF was designed for binder-free surface modification of nickel foam (NF). This is offered a novel approach for enhancing the electrochemical performance, and even energy density with a wider operating poten-tial window. An in-situ Ni-MOF was then synthesized on polyaniline@GO (PANI-GO) using an NH-fragment linker and an in...

June 7, 2024 tarihinde yüklendi.

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2023 (v1) Konferans bildirisi açık erişim

Electric Propulsion System Including Hall-Effect Thruster for IMECE Satellite

Yurttas, Yusuf; Cal, Baris; Gullu, Seda Kayra; Burat, Ilksen; Neugodnikov, Sergii; Ulusen, Demet;

TUBITAK UZAY previously developed a space qualified Electric Propulsion System (EPS). By means of experience and know-how which is obtained during 1.5 kW EPS development, 300 W EPS was developed and qualified for IMECE Project. FM EPS was manufactured and acceptance test campaign for EPS equipment was completed. 300 W EPS includes Hall Effect Thruster, Xenon Feeding Unit, Power Processing and Control Unit. This paper states qualification and acceptance tests of IMECE EPS equipment. Additionally, the paper describes the system level activitie...

June 7, 2024 tarihinde yüklendi.

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