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Full-Text Articles in Physical Sciences and Mathematics
Twinning Behavior Of Molecule-Adapted Gaussian-Type Orbitals (Gtos) In Cyclo-Hydrocarbons, Tong-Hyok Cha, Gum-Chol Kim, Kwang-Jin Ri, Jin-Nam Kim, Yong-Su Pak
Twinning Behavior Of Molecule-Adapted Gaussian-Type Orbitals (Gtos) In Cyclo-Hydrocarbons, Tong-Hyok Cha, Gum-Chol Kim, Kwang-Jin Ri, Jin-Nam Kim, Yong-Su Pak
Turkish Journal of Chemistry
The saturated cyclo-hydrocarbons CnH2n (n = 3–7) were constructed by the iterative coupling of the structural unit groups (SUGs), specifically the SUG-CH2C2 fragment, which was previously established for molecular basis optimization. For the McLean–Chandler 6-311+G basis set, under the SUG perturbation, the outer (s′, p′) and diffuse (sʺ, pʺ) primitive Gaussian type orbitals for the core-atom C* of SUG-CH2C2 undergo an off-center spatial displacement into a twinning configuration. Specifically, the s-type twins (s′, sʺ) share identical Gaussian exponents and are symmetrically shifted toward the two neighboring carbon atoms, while the p-type twins (p′, pʺ) exhibit a matching configuration. Generally, this …
Phytochemical Characterization, Cytotoxic Effects, And Potential Oxidative Dna Damage-Modulating Activities Of Arum Italicum Extract, Oznour Mourat Moustafa, Hülya Yağar
Phytochemical Characterization, Cytotoxic Effects, And Potential Oxidative Dna Damage-Modulating Activities Of Arum Italicum Extract, Oznour Mourat Moustafa, Hülya Yağar
Turkish Journal of Chemistry
Arum italicum is traditionally utilized in the Thrace region for the treatment of hepatic and dermatological disorders; however, experimental evidence supporting these ethnopharmacological applications remains limited. As oxidative stress-induced DNA damage is an important contributor to the pathogenesis of liver and skin diseases, the aim in the present study was to investigate the ability of A. italicum leaf and tuber extracts to modulate oxidative DNA damage in vitro using nontumorigenic and cancerous hepatic and cutaneous cell models. Phytochemical profiling, antioxidant capacity, and cytotoxic activity were also assessed to support and contextualize the observed DNA damage-related effects.In vitro investigations were conducted …
Facile One-Step Activated Glassy Carbon Electrode For Sensitive Tryptophan Sensing In Yogurt, Sevi̇lay Erdoğan Kablan, Ahmet Çeti̇nkaya, Si̇bel Özkan, Emi̇rhan Nemutlu
Facile One-Step Activated Glassy Carbon Electrode For Sensitive Tryptophan Sensing In Yogurt, Sevi̇lay Erdoğan Kablan, Ahmet Çeti̇nkaya, Si̇bel Özkan, Emi̇rhan Nemutlu
Turkish Journal of Chemistry
Activation of glassy carbon electrodes (GCEs) in tailored solution environments introduces oxygenated surface functionalities such as hydroxyl, carboxyl, and quinone groups. These modifications enhance electron‐transfer kinetics and strengthen interactions with target analytes, thereby improving electrochemical sensitivity. In this study, square-wave voltammetry was used, and the most suitable supporting electrolyte for tryptophan (TRP) analysis was a pH 3 Britton–Robinson buffer. The cyclic voltammetry potential range and number of cycles for the Act-GCE were obtained as 0–1.5 V and seven cycles, respectively. The activated electrode exhibited excellent analytical performance, with a linear response for TRP over 0.20–6.28 μM, a detection limit of …
Thiophene-Carbazole-Based Covalent Organic Polymer Electrodes For Electrochromic And Supercapacitor Applications, Si̇nem Altinişik
Thiophene-Carbazole-Based Covalent Organic Polymer Electrodes For Electrochromic And Supercapacitor Applications, Si̇nem Altinişik
Turkish Journal of Chemistry
In this study, a thiophene-carbazole-based conjugated organic polymer was successfully synthesized on indium tin oxide (ITO)/glass and graphite sheet substrates using in situ oxidative polymerization. In terms of electrochromic properties, the electrodes exhibited significant color change from light yellow-green to dark gray in the potential range of 0 V to 1.2 V, with optical contrast ranging from 84.2% to 47.2% and coloring efficiency of 171.3 cm2/C. The prepared PCBP-Th_ITO/glass electrode also exhibited fast switching times (tb = 0.89 s and tc = 2.05 s) at 650 nm. Furthermore, 90% optical stability was maintained after 1000 cycles. In terms of energy …
Fabrication Of Cross-Linked Thiophene-Coumarin-Fluorene Donor–Acceptor Pentamer Thin Films For Electrochromic Devices Application, Ari̇fe Aktaş, Mert Akgün, Mücahi̇t Özdemi̇r, Sermet Koyuncu
Fabrication Of Cross-Linked Thiophene-Coumarin-Fluorene Donor–Acceptor Pentamer Thin Films For Electrochromic Devices Application, Ari̇fe Aktaş, Mert Akgün, Mücahi̇t Özdemi̇r, Sermet Koyuncu
Turkish Journal of Chemistry
Functionalized p-conjugated polymers have emerged as promising electrochromic materials due to their well-defined molecular structures, facile synthesis, and ability to form smooth and homogeneous thin films. Furthermore, surface cross-linking enhances the mechanical and environmental stability of these films while improving their durability during electrochemical operation. In this study, a unique band gap-tunable pentamer (FBP) was developed featuring a D-A-D-A-D configuration, which includes thiophene, coumarin, and fluorene. Cross-linked films (FBPX) were obtained using both spray and electrospray methods in the presence of tetrathiol-based crosslinkers and 366 nm light, thanks to the functionalizable allyl groups present in the FBP structure. UV–Vis analysis …
Synthesis And Catalytic Activity Of Water-Soluble Ruthenium(Ii) P-Cymene Complexes In Tandem Nitroarene Reduction/N-Methylation And Transfer Hydrogenation, Si̇nem Çakir, Serdar Batikan Kavukcu, Hayati̇ Türkmen
Synthesis And Catalytic Activity Of Water-Soluble Ruthenium(Ii) P-Cymene Complexes In Tandem Nitroarene Reduction/N-Methylation And Transfer Hydrogenation, Si̇nem Çakir, Serdar Batikan Kavukcu, Hayati̇ Türkmen
Turkish Journal of Chemistry
In this study, a series of water-soluble ruthenium(II) p-cymene complexes bearing carboxylic acid-functionalized ligands (Ru1–Ru3) were synthesized, fully characterized (1H NMR, 13C NMR, and FT-IR), and evaluated in two distinct catalytic transformations: tandem nitroarene reduction/N-methylation and transfer hydrogenation. Of the catalysts tested, Ru1 exhibited superior catalytic activity in both systems. Under optimized conditions (1 mol% Ru1, 8 mmol NaBH4, 110 °C, 2 h in methanol), Ru1 promoted the one-pot tandem transformation of nitrobenzene to N-methylaniline with up to 93% conversion using methanol as a sustainable C1 and H2 source. Furthermore, Ru1 proved highly effective in the transfer hydrogenation of acetophenone …
Samarium-Doped Ceria Catalysts For Boron-Aluminum Composite Propellants: Effect Of Synthesis Method, Di̇lara Güçtaş Gürel, Mehmet Ali̇ Faruk Öksüzömer
Samarium-Doped Ceria Catalysts For Boron-Aluminum Composite Propellants: Effect Of Synthesis Method, Di̇lara Güçtaş Gürel, Mehmet Ali̇ Faruk Öksüzömer
Turkish Journal of Chemistry
Solid propellants based on ammonium perchlorate (AP) are widely used in rocket and missile propulsion systems due to their high energy density and reliable combustion characteristics. Although aluminum (Al) is the conventional metal fuel in AP-based formulations, boron (B) has gained increasing attention as a partial or full substitute owing to its significantly higher volumetric energy density. However, the low combustion efficiency of boron particles remains a critical challenge, making the use of catalysts essential to enhance the thermal decomposition of AP and overall propellant-burning performance. In this study, samarium-doped ceria (SDC20) catalysts were synthesized by three different methods including …
Rapid Synthesis Of Agcu Bimetallic Nanodendrites With Enhanced Catalytic Activity For 4-Nitrophenol Reduction, Jun Liu, Hongguang Liao, Xuanyan Liu
Rapid Synthesis Of Agcu Bimetallic Nanodendrites With Enhanced Catalytic Activity For 4-Nitrophenol Reduction, Jun Liu, Hongguang Liao, Xuanyan Liu
Turkish Journal of Chemistry
Herein, AgCu nanodendrites were fabricated via a facile one-step displacement reaction at ambient temperature with Zn powder as the reducing agent. The morphology, structure, and composition of the products were systematically characterized by transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The results demonstrate that the structure and morphology of the catalysts are strongly dependent on the Ag/Cu molar ratio. The catalytic performance was evaluated by the reduction of 4-nitrophenol (4-NP) at room temperature, in comparison with monometallic Ag and Cu catalysts. The catalytic activity follows the order Ag1Cu1 > Ag1Cu3 > Ag3Cu1 > Ag > Cu. The optimized Ag1Cu1 catalyst achieves 98.6% …
Effects Of Washing, Oxidation, Carboxylation, And Hydrophobicity On The Antibacterial Activity Of Graphene Oxide And Reduced Graphene Oxide, Emi̇r Boztepe, Ceren Poyraz, Ruki̇ye Taşdemi̇r, Ebru Önem, Ümran Sofu, Keri̇m Yapici
Effects Of Washing, Oxidation, Carboxylation, And Hydrophobicity On The Antibacterial Activity Of Graphene Oxide And Reduced Graphene Oxide, Emi̇r Boztepe, Ceren Poyraz, Ruki̇ye Taşdemi̇r, Ebru Önem, Ümran Sofu, Keri̇m Yapici
Turkish Journal of Chemistry
In this study, the effects of number of washes, oxidation degree, carboxylation, and hydrothermal reduction temperature on the antibacterial activity of graphene oxide (GO) and reduced graphene oxide (rGO) nanomaterials were investigated. GO derivatives with different numbers of washes (1–5W) and oxidation levels (3X, 6X, and 9X), carboxylated GO (GO-COOH), and rGO samples obtained at different hydrothermal reduction temperatures (100, 140, and 180 °C) were characterized by X-ray diffraction, field-emission scanning electron microscopy, Fourier-transform infrared spectroscopy, zeta potential analysis, and Raman spectroscopy, and were subsequently evaluated for antibacterial activity against gram-positive Staphylococcus aureus (S. aureus) and gram-negative Escherichia coli (E. …
Cobalt-Substituted Hydroxyapatite As A Potential Basis Of Biomaterials: Synthesis, Crystal-Chemistry Properties And Antibacterial Activity, Maria M. Vlasova, Ksenia S. Stasenko, Evgeny Bulanov
Cobalt-Substituted Hydroxyapatite As A Potential Basis Of Biomaterials: Synthesis, Crystal-Chemistry Properties And Antibacterial Activity, Maria M. Vlasova, Ksenia S. Stasenko, Evgeny Bulanov
Turkish Journal of Chemistry
This paper presents the results of the synthesis of solid solutions of cobalt-substituted hydroxyapatite of the composition Ca10-xCox(PO4)6(OH)2 by the solid-phase and solution method. The formation of only the composition of Ca9.5Co0.5(PO4)6(OH)2 has been reliably established, whereas an increase in the cobalt content, as well as an increase in the temperature of synthesis and calcination of the samples prepared in solution, leads to the formation of stable mixtures of calcium and cobalt phosphates. The crystal structure has been refined for Ca9.5Co0.5(PO4)6(OH)2 (a = 9.4121(28) Å, c = 6.8762(20) Å, V = 527.54(35) Å3; R-Bragg = 2.455%) under the assumption of …
Are Lagrangians Involving Fractional Derivatives Physically Viable?, Nicola Fabiano
Are Lagrangians Involving Fractional Derivatives Physically Viable?, Nicola Fabiano
Turkish Journal of Physics
The recent trend of incorporating fractional derivatives into Lagrangians prompts a critical assessment of their physical viability. This work analyzes such theories through the lenses of classical mechanics and quantum field theory (QFT), revealing profound foundational issues. While the nonlocal nature of fractional operators circumvents Ostrogradsky's theorem, it introduces more severe problems. Classically, these include a complicated variational principle and the violation of energy conservation due to broken time-translation symmetry. In QFT, the pathologies are fatal: the propagator violates the K\"all\'en--Lehmann spectral representation, leading to acausal propagation, ghost states, complex poles, and a loss of unitarity. We conclude that Lagrangians …
Electron-Loss And Electron-Capture Cross Sections In H + H₂⁺ Collisions, Saed J. Al Atawneh, Oqlah Al-Refai, Mohammed Abu-Seileek, Feras Afaneh
Electron-Loss And Electron-Capture Cross Sections In H + H₂⁺ Collisions, Saed J. Al Atawneh, Oqlah Al-Refai, Mohammed Abu-Seileek, Feras Afaneh
Turkish Journal of Physics
We investigate projectile electron-loss, target electron-loss, and target electron capture in H + H₂⁺ collisions using classical trajectory Monte Carlo (CTMC) and quantum-corrected classical trajectory Monte Carlo (QCTMC) methods within a fully four-body model. Energy-dependent cross sections are reported for all three channels. For projectile electron-loss, we additionally analyze impact-parameter-dependent probabilities and representative trajectories. The QCTMC method incorporates Heisenberg corrections, improving accuracy at low impact energies. Projectile and target electron-loss cross sections peak at intermediate energies and exhibit good agreement with H + H₂⁺ data at high energies. At low to intermediate energies, projectile electron-loss exceeds target electron-loss because the …
Nonlinear Mode Crossing And Spontaneous Frequency Comb Generation In Driven Magnetic Nanodisks, Hasan Pi̇şki̇n
Nonlinear Mode Crossing And Spontaneous Frequency Comb Generation In Driven Magnetic Nanodisks, Hasan Pi̇şki̇n
Turkish Journal of Physics
Nonlinear magnetization dynamics in confined nanostructures provide a rich platform for fundamental studies and advanced spintronic applications. Here, we investigate the driven dynamics of a perpendicularly magnetized permalloy nanodisk using high-resolution micromagnetic simulations. In the linear regime, geometric confinement quantizes the uniform precession into discrete radial standing spin-wave (SSW) modes. As the excitation amplitude increases, the fundamental Kittel mode exhibits a pronounced nonlinear frequency shift relative to the higher-order SSW modes, ultimately leading to a critical mode crossing associated with nonlinear resonance overlap and the breakdown of modal orthogonality. Time-domain analysis reveals that strong mode hybridization governs the ensuing dynamics, …
Microscopic Study Of Β-Decay And Stellar Weak Rates In Neutron-Rich Scandium Isotopes, Wajeeha Khalid, Jameel-Un Nabi, Maria Ramzan
Microscopic Study Of Β-Decay And Stellar Weak Rates In Neutron-Rich Scandium Isotopes, Wajeeha Khalid, Jameel-Un Nabi, Maria Ramzan
Turkish Journal of Physics
This study provides a critical investigation of the β-decay characteristics of neutron-rich scandium isotopes (53-65Sc) using the proton-neutron quasiparticle random phase approximation (pn-QRPA) model. The theoretical framework allows for a microscopic understanding of spin-isospin excitation modes that are essential for examining weak interaction phenomena. Charge-changing Gamow-Teller (GT) strength distributions were calculated and found to agree well with existing experimental results, thereby confirming the model's capacity to accurately represent the nuclear configuration of these isotopes. The computed β-decay half-lives and corresponding log ft values exhibit good agreement with experimental data, further validating the GT strength distributions and reinforcing the consistency of …
Comparison Of Umbral Dot Physical Properties In Developed And Undeveloped Sunspots, Muhammed Ali̇ Çalişir, Ali̇ Kilçik, Vasyl Yurchyshyn
Comparison Of Umbral Dot Physical Properties In Developed And Undeveloped Sunspots, Muhammed Ali̇ Çalişir, Ali̇ Kilçik, Vasyl Yurchyshyn
Turkish Journal of Physics
Sunspots are cool regions where the magnetic field is significantly stronger than in the surrounding photosphere, and their darkest central regions are known as the umbra. Umbral dots (UDs) are small, bright features within the umbra that represent convective motions partially suppressed by strong magnetic fields. In this study, high-resolution images from the Goode Solar Telescope (GST) at Big Bear Solar Observatory (BBSO) were used to analyze four sunspots at different evolutionary stages, including two developed and two undeveloped sunspots. The physical properties of UDs, including brightness, diameter, eccentricity, lifetime, and dynamic velocity, were measured and compared across these sunspots …
Stress–Strain Behavior Of The High-Entropy Cantor Alloy Crmnfeconi Using A Deep Neural Network Potential, Nguyen Le Hoai Phuong, Le Huu Nghia, Huynh Khanh Van, Vo Khuong Dien, Nguyen Thanh Tien
Stress–Strain Behavior Of The High-Entropy Cantor Alloy Crmnfeconi Using A Deep Neural Network Potential, Nguyen Le Hoai Phuong, Le Huu Nghia, Huynh Khanh Van, Vo Khuong Dien, Nguyen Thanh Tien
Turkish Journal of Physics
Machine learning interatomic potentials (MLIPs) provide an efficient approach to large-scale molecular dynamics simulations of high-entropy alloys. In this work, an MLIP trained on AIMD data was developed for the CrMnFeCoNi Cantor alloy and validated against DFT calculations. In addition, we compared MLIP results with those obtained using the classical modified embedded atom method (MEAM)-based interatomic potential for the CrMnFeCoNi Cantor alloy. The model achieved energy and force RMSEs of 7.39 x 10-6 meV/atom and 4.46 x 10-3 eV/A, respectively. Tensile simulations demonstrated that the MLIP accurately reproduced the stress–strain response, elastic constants, and deformation mechanisms observed in DFT calculations. …
Spacer-Mediated Gold Nanocube Arrays For Edge-Localized Excitonic Enhancement In Monolayer Mos2, Abdullah Efe Yildiz, Emre Ozan Polat
Spacer-Mediated Gold Nanocube Arrays For Edge-Localized Excitonic Enhancement In Monolayer Mos2, Abdullah Efe Yildiz, Emre Ozan Polat
Turkish Journal of Physics
Plasmonic nanostructures offer an effective route for enhancing light-matter interaction in atomically thin semiconductors, whose optical response is intrinsically limited by their subnanometer active thickness. Here, we numerically investigate excitonic enhancement in monolayer (ML) Molybdenum Disulfide (MoS2) coupled to size-tuned gold (Au) nanocube arrays separated by thin aluminum oxide (Al2O3) and hexagonal boron nitride (h-BN) spacer layers. By varying the nanocube side length, the localized surface plasmon resonance is tuned across the visible spectral range to modulate the A- and B-excitonic transitions of monolayer MoS2.We show that the nanocube-size-dependent spectral redshift can be further controlled through the spacer material and …
Theoretical Construction Of Light Hexaquarks And Their Substantiation By Seven-Dimensional Representation Of Su(2) Group, Mayank Joshi, Shuchi Bisht, Navjot Hothi, Manish Bisht
Theoretical Construction Of Light Hexaquarks And Their Substantiation By Seven-Dimensional Representation Of Su(2) Group, Mayank Joshi, Shuchi Bisht, Navjot Hothi, Manish Bisht
Turkish Journal of Physics
This manuscript presents a theoretical approach to constructing light hexaquarks using up and down quarks. These light exotic hexaquarks are shown to exhibit a seven-dimensional representation of the SU(2) isospin group. Additionally, the isospin septuplet is developed along with the quintet, triplet, and singlet representations for these light exotic hexaquarks. These particles are essentially mesonic in nature and also satisfy the requirements of the Kronecker product. Furthermore, the physical characteristics and weights of the respective states are intrinsically provided for these light hexaquarks.
Selective Citation: The Systematic Omission Of Established Regional Literature, İrem Eli̇tez
Selective Citation: The Systematic Omission Of Established Regional Literature, İrem Eli̇tez
Turkish Journal of Earth Sciences
No abstract provided.
Integrated Assessment Of Groundwater Quality And Human Health Risks In A Semiarid Region Of Kemaliye (Türkiye), Veli̇ Keski̇n, Celaletti̇n Şi̇mşek
Integrated Assessment Of Groundwater Quality And Human Health Risks In A Semiarid Region Of Kemaliye (Türkiye), Veli̇ Keski̇n, Celaletti̇n Şi̇mşek
Turkish Journal of Earth Sciences
In this study, the hydrochemical characteristics, drinking water suitability, and potential human health risks of groundwater in the Karapınar region (Kemaliye, Erzincan, Türkiye), which has become a critical drinking water resource due to drought associated with climate change and the depletion of surface water resources, were investigated using an integrated multiparameter approach. Within the scope of the study, a total of 18 water samples, comprising 13 spring water samples and 5 groundwater samples obtained from wells, were collected during the dry season (October 2021) and analyzed for major ions, physicochemical parameters, nitrate, and trace elements. The suitability of the samples …
Signals In The Ionosphere Ahead Of Tsunami Arrival, Svetlana Riabova, Sergey Shalimov
Signals In The Ionosphere Ahead Of Tsunami Arrival, Svetlana Riabova, Sergey Shalimov
Turkish Journal of Earth Sciences
We consider the impact of the tsunami propagating after the earthquake in Tohoku on the ionosphere according to measurements from the Hawaiian Islands, i.e., at a fairly large distance from the epicenter of the earthquake. These measurements, taken at a tidal tsunami monitoring station, at a magnetometric station, and by GPS, were used to record the arrival of the tsunami. We experimentally establish that the arrival of atmospheric waves generated by the tsunami significantly advanced the arrival of sea waves at the observation point, and this advance from one source was recorded in both the lower and upper ionosphere. Attention …
Editorial Note To The Article “Identification Of A Previously Unrecognized Listric Fault Beneath The Acıpayam Graben: Insights From Integrated Dinsar And Field Observations” [Turkish Journal Of Earth Sciences 35 (1) 2026 20-41], Orhan Tatar
Turkish Journal of Earth Sciences
No abstract provided.
Possible Fluid Contributions From Active Faults To Mercury Distribution In Surface Sediments Of The Gemlik Gulf And Health Risk Assessment, Erol Sari, M. Namik Çağatay, Tuğçe Nagi̇han Arslan Kaya, Zeynep Çeti̇n, Nuray Çağlar
Possible Fluid Contributions From Active Faults To Mercury Distribution In Surface Sediments Of The Gemlik Gulf And Health Risk Assessment, Erol Sari, M. Namik Çağatay, Tuğçe Nagi̇han Arslan Kaya, Zeynep Çeti̇n, Nuray Çağlar
Turkish Journal of Earth Sciences
The Gemlik Gulf, located in the eastern part of the Sea of Marmara (Türkiye), is recognized as a relatively contaminated marine environment, influenced by a variety of natural and anthropogenic inputs. A comprehensive geochemical study was performed to examine the distribution of total mercury (THg) in surface sediments and to elucidate the possible sources contributing to its accumulation. The analysis revealed that THg concentrations ranged from 485 to 6486 ng/g, with all measured values substantially exceeding the average shale background concentration of 400 ng/g, indicating significant enrichment. According to sediment quality guidelines, none of the samples exceeded the effects range …
Paleoecology Of Loftusia Species (Large Benthic Foraminifera) In The Zagros Basin, North Of The Neotethys, Hossein Ghanbarloo, Amrollah Safari
Paleoecology Of Loftusia Species (Large Benthic Foraminifera) In The Zagros Basin, North Of The Neotethys, Hossein Ghanbarloo, Amrollah Safari
Turkish Journal of Earth Sciences
Paleoecological analyses based on the wall structure of the genus Loftusia were carried out in the Maastrichtian deposits of seven outcrops of the Zagros Basin. Two types of particles are present within the wall structure: (1) tiny fossil grains and (2) detrital grains. Tiny fossil grains consist of smaller foraminifera and other small microorganism tests. Foraminiferal tests are associated with miliolid, textulariid, and rotaliid forms. Detrital grains include intraclasts and extraclasts. The presence of different particles in the test wall of this genus and the abundance of this genus in nutrient-rich conditions indicate that Loftusia are probably opportunistic foraminifera. This …
Neoproterozoic Uranium-Mineralized Sedimentary Rocks From The Kaladgi Basin, Dharwar Craton, Southwestern India: Source And Transport Mechanism Of Uranium, Ponnalagu Govindaraj, Arumugam Shanmugasundaram, Sooriamuthu Ramasamy, Muthusamy Ravichandran
Neoproterozoic Uranium-Mineralized Sedimentary Rocks From The Kaladgi Basin, Dharwar Craton, Southwestern India: Source And Transport Mechanism Of Uranium, Ponnalagu Govindaraj, Arumugam Shanmugasundaram, Sooriamuthu Ramasamy, Muthusamy Ravichandran
Turkish Journal of Earth Sciences
The Kaladgi Basin of the Dharwar Craton, southeast India, hosts Proterozoic unconformity-related uranium (U) mineralization controlled by faulted contacts between Archean basement and Proterozoic cover sediments. To understand the ore-forming processes, 25 core samples from the Cave Temple Arenite were analyzed using whole-rock geochemistry and fluid inclusion microthermometry. U concentrations reach up to 0.13% U3O8 in the basal arenite and lower conglomerate, whereas the basement schist records only 0.0017% U. Whole-rock data reveal high SiO2 contents (72–97 wt.%), variable Al2O3 (0.4–12.9 wt.%), and enrichments in U (0.38–6.63 ppm), Th (1.5–13.7 ppm), and trace elements such as Cu, Pb, and Ni …
Citation Scope And Scientific Relevance In An Event-Based Seismotectonic Study: Reply To The Comment By Elitez On Eski (2026), Semi̇h Eski̇
Citation Scope And Scientific Relevance In An Event-Based Seismotectonic Study: Reply To The Comment By Elitez On Eski (2026), Semi̇h Eski̇
Turkish Journal of Earth Sciences
No abstract provided.
Challenges, Trends, And The Role Of Lstm In Ai-Based Predictive Maintenance Of Electrolyzers For Solar Hydrogen Systems: A Review, Yani Koerniawan Kuatno, Muhamad Zahim Sujod
Challenges, Trends, And The Role Of Lstm In Ai-Based Predictive Maintenance Of Electrolyzers For Solar Hydrogen Systems: A Review, Yani Koerniawan Kuatno, Muhamad Zahim Sujod
Turkish Journal of Electrical Engineering and Computer Sciences
The transition toward low-carbon energy systems has increased interest in hydrogen as a clean energy carrier, with solar-driven water electrolysis emerging as a promising technology due to its high efficiency and compatibility with renewable energy sources. However, dynamic operating conditions and intermittent renewable input accelerate electrolyzer degradation, reducing reliability and system lifespan. Predictive maintenance (PdM), supported by artificial intelligence (AI), offers a data-driven approach to anticipate failures and improve operational durability. This review systematically investigates AI-based PdM approaches for electrolyzers, with an emphasis on long short-term memory (LSTM) networks and Internet of things (IoT) integration. Following PRISMA 2020 guidelines, 35 …
Dynamic Focal Loss Adjustment For Railway Defect Detection, Mehmet Koç, Ridvan Özdemi̇r, Ömer Gerek
Dynamic Focal Loss Adjustment For Railway Defect Detection, Mehmet Koç, Ridvan Özdemi̇r, Ömer Gerek
Turkish Journal of Electrical Engineering and Computer Sciences
Railway infrastructure is critical to the safe and efficient operation of transportation systems, and the early detection of defects is essential for preventing catastrophic failures. Automated defect detection methods are therefore crucial for maintaining continuous safety while reducing maintenance costs. Although Focal Loss is widely used in object detection under class-imbalanced conditions, its fixed α parameter may limit its effectiveness in detecting rare defects. In this study, we propose an adaptive α-tuned Focal Loss approach that dynamically adjusts class weights based on average precision (AP) values. By iteratively optimizing α without relying on gradient-based optimization, the proposed method improves the …
Relative Rate Observer-Based Online Tuning Mechanism For Single-Input Interval Type-2 Fuzzy Pid Controllers, Oqba Aldreiei, Cenk Ulu, Mert Can Kurucu, Müjde Güzelkaya
Relative Rate Observer-Based Online Tuning Mechanism For Single-Input Interval Type-2 Fuzzy Pid Controllers, Oqba Aldreiei, Cenk Ulu, Mert Can Kurucu, Müjde Güzelkaya
Turkish Journal of Electrical Engineering and Computer Sciences
The characteristics of the footprint of uncertainty (FOU) in interval type-2 membership functions (IT2-MFs) are crucial to the performance and robustness of interval type-2 fuzzy controllers (IT2-FCs). However, existing IT2-FC design approaches mostly use fixed FOU structures. This study proposes an online membership function (MF) adjustment mechanism for a single-input interval type-2 fuzzy PID controller (SIT2-FPID) that adjusts the FOU of the antecedent MFs and weights of the consequent MFs, respectively, to achieve high performance and robustness. The proposed online adjustment mechanism consists of a relative rate observer (RRO), a two-input rule-base adjustment system, and a first-order smoothing filter. The …
Cuip-X25: A Real-World Network Intrusion Dataset For Next-Generation Ai-Driven Security, Arshad Iqbal, Sohail Asghar
Cuip-X25: A Real-World Network Intrusion Dataset For Next-Generation Ai-Driven Security, Arshad Iqbal, Sohail Asghar
Turkish Journal of Electrical Engineering and Computer Sciences
The efficacy of artificial intelligence (AI) in intrusion detection systems (IDS) is critically dependent on high-fidelity training data. However, as detailed in the manuscript's literature review, existing benchmark datasets are predominantly synthetic, outdated, or imbalanced and fail to capture the complexity of the contemporary threat landscape. To bridge this gap, this study introduces CUIP-X25, a novel real-world cyber-attack dataset captured over a four-month period using a dionaea honeypot deployed on a public network. Unlike synthetic alternatives, this dataset provides an authentic representation of modern adversarial tactics, techniques, and procedures, encompassing 3.16 million real events across ten distinct attack categories, including …