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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 374 journals)
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Adıyaman University Journal of Science
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2147-1630 - ISSN (Online) 2146-586X
Published by Adıyaman Üniversitesi Homepage  [2 journals]
  • Structural, Magnetic and Catalytic Properties of FeCo Nanoparticles
           Synthesized by Polyol Process

    • Authors: Emre Can TAYFUN; Kaan ERMAN, Doğan KAYA, Faruk KARADAĞ, Ahmet EKİCİBİL
      Abstract: Multi-functional FeCo nanoparticles (NPs) exhibit unique structural, magnetic, and catalytic properties, making them versatile materials with potential applications in diverse fields. In this work, we investigated the structural, electrochemical, and magnetic properties of as- prepared FeCo NPs synthesis by polyol method. X-ray diffraction analysis revealed multiphase structures: FeCo and α-Fe2O3 phases and scanning electron microscopy images confirmed spherical-like structures of FeCo NPs with an average size of 12.4 ± 0.1 nm. The electrochemical properties of FeCo NPs were investigated using a three-electrode setup in a 1 M KOH electrolyte at room temperature. The onset potentials for FeCo catalysts were found to be -0.15 V for ORR, 0.25 V for OER, and -1.26 V for HER. Tafel measurements further elucidated the reaction mechanism, revealing corrosion potentials of -0.165 V for ORR and 0.215 V for OER, with Tafel slopes of 228 mV dec-1 and 48 mV dec-1, respectively. A significant increase in magnetization was observed below 25 K in both zero-field-cooled and field-cooled curves, a magnetic transition temperature, Ts, occurs at 15 K, possibly indicating a ferromagnetic-to-antiferromagnetic phase transition. The hysteresis loop measurements revealed coercive field values ranging from 968 Oe at 5 K to approximately 206 Oe at 320 K, indicating a relaxation in magnetic spin orientation with increasing temperature. The saturation magnetization (Ms) values were recorded as 15.2 emu/g under a 5 T magnetic field, and the remanent magnetization (Mr) showed dominant ferromagnetic properties at 5 K with an Mr/Ms ratio indicating soft magnetic behavior. The magnetic susceptibility of FeCo NP exhibited a peak at approximately 25 K, and the Curie-Weiss law provided an estimated θ angle of -9.58°, suggesting antiferromagnetic interactions.
      PubDate: Sun, 31 Dec 2023 00:00:00 +030
       
  • A Note on The Some Class of Symmetric Numerical Semigroups

    • Authors: Ahmet ÇELİK
      Abstract: In this article, we will examine some classes of symmetric numerical semigroups and half of them, which are a class of irreducible numerical semigroups such that U= and U= symmetric numerical semigroups, respectively.
      PubDate: Sun, 31 Dec 2023 00:00:00 +030
       
  • Chen-like Inequalities on Submanifolds of Cosymplectic 3-Space Forms

    • Authors: Mehmet GÜLBAHAR; Esra ERKAN
      Abstract: In this paper, some equalities and inequalities involving the Riemannian curvature invariants are obtained on 3-semi slant submanifolds of cosymplectic 3-space forms. Obtained relations for 3-semi slant submanifolds are examined on 3-slant, invariant, and totally real submanifolds.
      PubDate: Sun, 31 Dec 2023 00:00:00 +030
       
  • A Numerical Application of the Chebyshev Operational Matrix Method for HIV
           Infection of CD4+T-cells

    • Authors: Yalçın ÖZTÜRK; Ayşe ANAPALI ŞENEL, Ceren LİMONCU, Mustafa GÜLSU
      Abstract: In this research study, we aim to approximate a solution for the mathematical model of the Human Immunodeficiency Virus (HIV) infection of CD4+T-cells. An operational matrix method based on Chebyshev orthogonal polynomials has been adapted to obtain numerical solutions for the model of HIV infection of CD4+T-cells. The proposed numerical scheme is built on a system of a nonlinear algebraic equation, including coefficients of a finite Chebyshev series that represent the approximate solutions of the model. Results are compared to existing methods to verify the accuracy of the numerical scheme.
      PubDate: Sun, 31 Dec 2023 00:00:00 +030
       
  • Bioactivity Features of Novel Actinobacteria Isolated from Lichen and
           Orchid Plant

    • Authors: Hilal ATEŞ; Hilal AY
      Abstract: A total of 10 actinobacterial strains were isolated from a lichen and an orchid species by employing a selective isolation procedure for actinobacteria. Antimicrobial activities of the isolates were evaluated against Aspergillus niger ATCC 16404, Candida albicans ATCC 10231, Enterococcus faecalis ATCC 29212, Bacillus subtilis ATCC 6633, Escherichia coli ATCC 25922, Klebsiella pneumoniae A TCC 700603, Pseudomonas aeruginosa A TCC 27853, Salmonella enterica ATCC 13311, Staphylococcus aureus ATCC 29213 and Listeria monocytogenes NCTC 5348. Out of the 10 isolates, eight showed antimicrobial activity against at least one pathogen. For molecular identification of the strains, 16S rRNA gene sequence analysis was performed. The pairwise comparison of the 16S rRNA gene sequences of the strains with the databases showed that the strains are members of the genus Streptomyces by sharing 98.9 – 100% gene sequence similarities. Phylogenetic relationships of the strains within the genus Streptomyces were revealed by maximum likelihood and maximum parsimony phylogenetic trees. The results revealed that unexplored environmental habitats like lichens and plant tissues may represent a potential reservoir for novel actinobacteria with promising bioactivity features.
      PubDate: Sun, 31 Dec 2023 00:00:00 +030
       
  • The Sintering Temperature Effect on Magnetocaloric Effect in La2MnNiO6
           Double Perovskite Manganite Material

    • Authors: İbrahim Barış SEVER; Arda KANDEMİR, Ali Osman AYAŞ, Ahmet EKİCİBİL
      Abstract: La2NiMnO6 double-perovskite manganite samples were produced with sol-gel method to investigate structural, morphological, magnetic and magnetocaloric properties. They were sintered at 1000 and 1100 ̊C for LNM-1000 and LNM-1100 sample, respectively. The crystal structure of the samples was determined as Rhombohedral with R3𝑐 space group. Morphological analyses revealed that LNM-1000 sample included different polygonal shaped grains with small magnitudes, while grain boundaries became unclear for the LNM-1100 sample. The Curie temperatures were determined as 200 and 220 K while effective magnetic moment values were calculated as 1.75 and 2.13 for LNM-1000 and LNM-1100 samples, respectively. Arrot plots showed that samples exhibited second order magnetic phase transition. Maximum magnetic entropy change and relative cooling power values were calculated as 0.21, 0.25 J kg-1 K-1 and 46.2, 50.5 J kg-1 for LNM-1000 and LNM-1100 samples, respectively. Although the samples have the Curie temperature around sub-room temperature range that is much higher than Gd2NiMnO6 (5 K) and they have second order magnetic phase transition, relatively low value of magnetic entropy change values of these samples limits their usage as a magnetic coolant material.
      PubDate: Sun, 31 Dec 2023 00:00:00 +030
       
  • On the Interval Valued Cesaro Convergent Sequences Space

    • Authors: Gülsen KILINÇ; Mehmet Sezai YILDIRIM
      Abstract: The concept of quasilinear space is a field that needs to be matured, the foundations of which were laid by S. M. Aseev's published work in 1986. The simplest nonlinear quasi linear space example is the set 𝑃 which is a class of closed intervals of real numbers. In this study, it was given an interval-valued sequence space using the Cesàro limitation method's matrix domain. Also, its quasilinear space structure, some topological characteristics, and some inclusion relations were examined.
      PubDate: Sun, 31 Dec 2023 00:00:00 +030
       
 
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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 374 journals)
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