Bartın Üniversitesi Araştırma ve Akademik Performans Sistemi
DSpace@Bartın, Bartın Üniversitesi’nin bilimsel araştırma ve akademik performansını izleme, analiz etme ve raporlama süreçlerini tek çatı altında buluşturan bütünleşik bilgi sistemidir.
İndekslere Göre Dağılım
Yıllara Göre Dağılım
Türlere Göre Dağılım
Güncel Gönderiler
Öğe Türü: Yayın , Synthesis, Structural Analyses, Antimicrobial Activities, DNA Topoisomerase Inhibition, Cytotoxicity, and Genotoxicity Studies of Unsymmetrical Dispiro(N/N)Cyclotriphosphazenes(Wiley-Blackwell Publishing Ltd, 2026) Cemaloğlu, Reşit; İşcan, Özlem; Asmafiliz, Nuran; Tümer, Yasemin; Açık, Leyla; Kılıç, Zeynel; Sabah, Büşra Nur; Çelik, Süheyla Pınar; Hökelek, Tuncer; Foto, Fatma Zilifdar; Foto, Egemen; İşcan, Özlem; Rektörlüğe Bağlı Birimler, Proje ve Teknoloji Ofisi Genel KoordinatörlüğüIn this study, the synthesis, characterization, chiral properties, and bioactivities of partially and fully substituted unsymmetrical cis-(1a-4a, S1a, S3a, and S4a) and trans-(1a-4a)dispirocyclotriphosphazenes were investigated. All cis- and trans-dispirocyclotriphosphazenes are expected to exist as pseudomesoracemates and racemates, respectively. The single-crystal X-ray analysis of trans-1a proves that the compound exists as a racemic mixture (RR'/SS'). Moreover, cis-2a is a pseudomesoracemate, and the absolute configuration of one enantiomer was found to be SR'. 31P NMR spectra of cis/trans-2a recorded with the addition of (R)-(-)-1-(9’-anthryl)-2,2,2-trifluoroethanol (CSA) confirmed these findings. Furthermore, the antimicrobial activities, DNA interactions, topoisomerase I (Topo I) inhibitory properties, cytotoxic, genotoxic and mutagenic potentials of the dispirocyclotriphosphazenes have also been demonstrated. Compounds trans-2a, cis-3b, and trans-3b show lower MBC values against Klebsiella pneumoniae ATCC 13883 than ampicillin. Cis-2a and trans-3b (MBC = 78.1 µM) are as effective as the control ketoconazole against the yeasts Candida krusei and Candida tropicalis. Since selectivity indices ranged from 0.9 to 1.8, trans-3a, trans-3b, trans-4a, and trans-4b showed moderate cytotoxic effects against HT29 human cancer cells. DNA-binding and topoisomerase-inhibition assays indicate that these effects occur through DNA binding and alteration of the compounds' topology. Trans-3b showed the highest genotoxic effect against both cancer and healthy cells.Öğe Türü: Yayın , Strong ground motion and structural damage in the 2023 Kahramanmaraş earthquakes: A comparative case study of numerical predictions and field observations(Wiley-Blackwell, 2026) Kartal, Saruhan; Sönmezer, Yetiş Bülent; Baş, Selçuk; Baş, Selçuk; Mühendislik Mimarlık ve Tasarım Fakültesi, İnşaat Mühendisliği BölümüOn February 6, 2023, southeastern Türkiye was struck by two catastrophic earthquakes (Mw: 7.7 and Mw: 7.6) along the East Anatolian Fault Zone, causing extensive structural failures and significant loss of life. This study evaluates the seismotectonic characteristics of the sequence, analyzes strong ground motion data against the Turkish Building Earthquake Code (TBEC-2018) design spectra, and investigates the correlation between numerical performance predictions and observed field damage of a reinforced concrete building in Kırıkhan/Hatay. Ground motion data from affected provinces demonstrated peak ground accelerations exceeding code expectations by up to five times, particularly in areas with soft alluvial soils, amplifying seismic demands through site effects and near-fault phenomena. A core contribution of this research is the detailed structural evaluation of a representative reinforced concrete building subjected to these extreme demands, incorporating experimental concrete compressive strengths derived from material tests and field-verified reinforcement layouts. While nonlinear static assessments executed via macro-level modeling tools successfully predicted global stability and “Collapse Prevention” status under DD-1 and DD-2 hazard levels, they failed to capture the brittle shear failures observed in short coupling beams and shear wall boundary elements. This divergence stems from the models' tendency to idealize ductile flexural response, overlooking localized brittle triggers exacerbated by poor workmanship, inadequate transverse reinforcement, and reinforcement debonding. These findings demonstrate that while macro-level modeling effectively evaluates global structural safety, it must be coupled with shear-sensitive formulations and localized damage criteria to accurately capture actual structural capacity during extreme seismic events.Öğe Türü: Yayın , Statistical properties of neutrosophic n-normed spaces in a non-Archimedean framework(Karaganda State Univ, 2026) Ahmad, Mukhtar; Savaş, Ekrem; Mursaleen, Mohammad; Mursaleen, Mohammad; Fen Fakültesi, Matematik BölümüThe notion of statistical convergence is a natural extension of ordinary convergence which has been studied by several authors in different spaces. Recently, several studies have shown a growing interest in convergence theory in neutrosophic spaces. In this research article, we investigate the statistical convergence and related notions of sequences in a non-Archimedean neutrosophic n-normed space. By combining natural density with the three neutrosophic components of truth-membership, indeterminacy-membership, and falsity-membership, we formulate statistical convergence with respect to the neutrosophic n-norm structure. Several equivalent characterizations of statistical convergence are established, including formulations in terms of exceptional index sets of natural density zero and componentwise statistical limits. We prove that the statistical limit, whenever it exists, is unique. Moreover, we show that ordinary convergence with respect to the neutrosophic n-norm implies statistical convergence, and we examine the corresponding behavior of algebraic operations, particularly the preservation of statistical convergence under addition. Statistical Cauchy sequences are also introduced and studied. In particular, every Cauchy sequence in the neutrosophic n-norm sense is shown to be statistically Cauchy. The notion of statistical completeness is then discussed through statistically Cauchy sequences and their statistical limits. Finally, illustrative examples in finite-dimensional real spaces are provided to clarify the abstract definitions and demonstrate sequences that are statistically convergent even when ordinary convergence fails. These results extend classical statistical convergence concepts to a neutrosophic non-Archimedean setting. The developed framework also provides a foundation for investigations of summability, approximation, and nonlinear analytical problems.Öğe Türü: Yayın , Soliton extraction and geometric analysis for the Hamiltonian amplitude equation(Nature Research, 2026) Türk, Funda; Türk, Funda; Fen Fakültesi, Matematik BölümüThis study presents an integrated analytical and geometric investigation of the Hamiltonian amplitude equation through Lie-point symmetry analysis, conservation-law construction, Hamiltonian–Poisson formulation, and soliton-based numerical verification, together with an exact-solution analysis of its M-truncated form. The mass, momentum, and energy conservation laws are derived using the multiplier method and are independently recovered through an extended Lagrangian formulation and Noether’s theorem, demonstrating the consistency of these approaches. The Lie-point symmetry generators associated with time and space translations, phase rotation, and Galilean invariance are explicitly constructed. The equation is subsequently formulated within a Hamiltonian–Poisson framework, showing that the conserved functionals generate the corresponding continuous symmetry flows through the Poisson bracket. In addition, the rational extended sinh-Gordon equation expansion method is applied to the M-truncated form of the equation to derive several families of exact hyperbolic-function solutions, including dark, singular, mixed bright–dark, and mixed singular soliton structures. The analysis establishes the Lie symmetry, conservation-law, Noether, and Hamiltonian–Poisson structures of the Hamiltonian amplitude equation, while extending its exact-solution treatment to the M-truncated form through distinct soliton families. The derived conservation laws are subsequently verified numerically using bright and dark soliton profiles of the Hamiltonian amplitude equation. The conserved quantities remain invariant to high numerical accuracy over long propagation intervals, with relative errors remaining below. Two-dimensional, three-dimensional, and contour plots further illustrate the localized and shape-preserving profiles of the obtained solutions. These findings confirm the consistency between the analytical and numerical results and clarify the relationships among symmetry transformations, conserved quantities, Hamiltonian structures, and soliton propagation.Öğe Türü: Yayın , Quasi-multiplier homotopes of ternary rings of operators(American Institute of Mathematical Sciences, 2026) Wang, Hong-Wei; Çetin, Selim; Gürdal, Mehmet; Kişi, Ömer; Cai, Qing-Bo; Kişi, Ömer; Fen Fakültesi, Matematik BölümüWe study associative products x*zy=xzy on a ternary ring of operators X, where z ∈ X* is contractive. Completely isometric isomorphisms are characterized by the orbit of the parameter under ternary isomorphisms. For every such parameter, we compute the Jacobson radical and show that it has cube zero. For closed-range parameters, the semisimple quotient is completely boundedly isomorphic to a C*-corner. For nonzero closed-range parameters on B(H,K), the existence of a bounded algebra isomorphism is equivalent to the existence of a completely bounded one. These isomorphism classes are determined by the dimensions of the range, kernel, and cokernel. We also obtain an explicit divided-difference functional calculus and extend the closed-range results to adjointable operators on Hilbert C*-modules.
