Recep Tayyip Erdoğan Üniversitesi Kurumsal Akademik Arşivi
DSpace@RTEÜ, Recep Tayyip Erdoğan Üniversitesi tarafından doğrudan ve dolaylı olarak yayınlanan; kitap, makale, tez, bildiri, rapor, araştırma verisi gibi tüm akademik kaynakları uluslararası standartlarda dijital ortamda depolar, Üniversitenin akademik performansını izlemeye aracılık eder, kaynakları uzun süreli saklar ve yayınların etkisini artırmak için telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
Uncovering the determinants of ship detention duration in the Black Sea Region: a hybrid Bayesian and association rule mining perspective
(Nature Research, 2026) Çakır, Erkan; Çelik Maşalacı, Burcu
This study examines the key determinants of ship detention duration under Port State Control (PSC) within the Black Sea Memorandum of Understanding (MoU) region, comparing pre-pandemic and pandemic inspection outcomes. Using 756 PSC detention cases retrieved from the Black Sea Information System, a Tree-Augmented Naïve Bayesian Network (TAN) and Association Rule Mining (ARM) were applied to identify both probabilistic dependencies and frequent co-occurrence patterns. The TAN analysis revealed that PSC Authority exerted the strongest influence on detention duration, with its impact increasing notably during the pandemic. ISM Code-related deficiencies also became more critical, while traditional technical deficiencies such as Fire Safety and Life-Saving Appliances declined in significance. ARM results further highlighted that ISM non-compliance on older Ro-Ro vessels, were closely associated with detentions longer than two days in Russian and Romanian ports. These findings underline the necessity of authority-specific, risk-based inspection strategies and improved standardisation of ISM audits to minimise operational disruptions. This study is the first duration-focused analysis for the Black Sea MoU using an integrated TAN + ARM framework.
Finite element investigation of TPMS-inspired microplate structures for mechanical stability enhancement in sports equipment
(Nature Research, 2026) Liu, Long; Liu, Long; Foong, Loke Ko; Yaylacı, Murat
The development of lightweight but impact-resistant sports gear needs structural ideas that boost mechanical stability while also keeping good energy uptake characteristics. Here, we do a finite element look into TPMS inspired multilayer microplate designs under dynamic input, like real-time excitation. We choose three different TPMS cores, Primitive, Gyroid, and I-graph, wrapped into what we call a Wrapped Package-graph, to see how they affect the nonlinear vibration behavior and the energy dissipation in sandwich-type microplates. The mechanical setup is built on Mindlin–Reissner plate theory, but we also add von Kármán-style geometric nonlinearity, so the model can capture the moderate to large deflection effects properly. For size-related trends, we use the modified strain gradient theory (MSGT), in which several material length-scale parameters are brought in to represent microscale deformation mechanisms in a more faithful way. Furthermore, the way the microplate interacts with its supporting medium is treated through a nonlinear elastic foundation, so the behavior stays close to the more realistic operating conditions you see in sports equipment. A full finite element setup is built, where the nonlinear part of the deviatoric stretch-gradient vector is slipped into the governing equations. Then the nonlinear system is handled in order to pull out transient responses, mode shapes, and how kinetic, potential, and overall energies change in time. After that, parametric checks are run to see how the TPMS topology, the excitation intensity, the foundation stiffness, the geometric dimensions, and those MSGT length-scale parameters affect the structural performance. The numerical findings show clear gaps between the P, G, and IWP architectures when it comes to vibration behavior and the ability to absorb energy. Especially, TPMS-based multilayer microplates seem to provide better dynamic steadiness, together with a higher elastic strain energy, which suggests they could be used in next-generation high-performance sports hardware under impact and vibration loading.
Metal–organic frameworks for analytical chemistry: Solid-phase microextraction and dispersive (micro)-solid phase extraction
(Elsevier, 2026) Kıztanır, Gamze; Demir, Selçuk; Tokalıoğlu, Şerife; Şahan, Halil
Metal–organic frameworks (MOFs), owing to their high surface areas, tunable pore sizes, and selective interaction capabilities, have emerged as promising sorbents in analytical chemistry for the separation and enrichment of various chemicals from complicated matrices, such as human body fluids and environmental water samples. Recent studies have demonstrated their effectiveness in selectively extracting various analytes, including pesticides, heavy metals, drug residues, antibiotics, mycotoxins, and persistent organic pollutants from complex biological, environmental, and food matrices. Magnetic MOFs and molecularly imprinted MOF hybrids offer significant advantages, such as compliance with green chemistry principles, reusability, and enhanced selectivity, thereby broadening their application scope. Moreover, ultrasound-assisted and automation-compatible extraction systems reduce processing times, enable multi-analyte detection, and hold potential for field-deployable applications. Herein, we systematically review the literature on MOFs for solid-phase microextraction (SPME), dispersive solid-phase extraction (D-SPE), and dispersive micro-solid phase extraction (D-μ-SPE) for biomedical applications, extraction of organic molecules, agricultural pest control, and metal adsorption. The investigation of MOFs as adsorbents has not only broadened their application scope but may also address critical issues associated with adsorption methods, such as selectivity, stability, cost-effectiveness, and time efficiency, which are paramount in adsorption technology. The structure, pore dimensions, and functional groups of MOFs are all modifiable, enabling distinctive interactions with guest molecules to attain certain physical-chemical adsorption properties. Moreover, the stability and simplicity of MOF production demonstrate that they are optimal adsorbents for analytical chemistry.
A universal mem-element emulator with a single MO-OTA core: Memristor, memcapacitor, and meminductor in one reconfigurable circuit
(Elsevier, 2026) Gül, Fatih; Babacan, Yunus
A universal mem-element emulator is built around a single multi-output operational-transconductance-amplifier (MO-OTA) core, one analog multiplier and one grounded resistor–capacitor pair. The same core reproduces the pinched-hysteresis dynamics of the memristor, the memcapacitor and the meminductor; only the front-end coupling and the reflection law change. An explicit state equation follows from Chua's flux–charge formulation, with the integrator voltage vC as the state. The memristor reflection law is calibrated against the Strukov–Williams compact model of an HP TiO2 device, matching its memristance excursion to 0.9% and its loop area to 5.9% over 5–100 kHz. Both active blocks are transistor-level in TSMC 0.18μm CMOS: a 15-MOSFET MO-OTA and a new 9-MOSFET four-quadrant multiplier that runs from ±0.9V with 0.16% THD and zero systematic offset. The 24-MOSFET emulator dissipates 0.61mW and preserves pinched v–i, q–v and φ–i loops from 1 kHz to 22MHz. Robustness spans 45 process–voltage–temperature corners and a 500-run Monte-Carlo analysis with per-device threshold-mismatch; the modulated element stays positive-definite in every run (σ/μ=9.7%). In the Itoh–Chua oscillator it yields a double-scroll attractor with λmax=0.311, against 0.276 for an ideal memristor. It stays fully floating, needs no mutator or switching network, and uses the smallest active-block count among universal emulators.
First-aid knowledge among undergraduate and specialist dental students in Turkey: a cross-sectional study
(BioMed Central Ltd, 2026) Erdem, Rahime Zeynep; Bedir, Fatih
Background: Dental professionals frequently treat patients with systemic conditions, and medical emergencies can occur during dental procedures, circumstances that underscore the importance of first-aid competence in dental training. In this study, specialist dental students refers to postgraduate students enrolled in accredited dental specialty programmes (e.g., orthodontics, endodontics, periodontics). This cross-sectional study aimed to evaluate and compare first-aid knowledge levels among pre-clinical (years 1–3), clinical (years 4–5), and specialist dental students enrolled in Turkish dental faculties, and to assess whether the proportion reporting formal first-aid training differed across these groups. Methods: Data were collected using a validated 23-item questionnaire (Cronbach’s α = 0.87) distributed via Google Forms (Google, Mountain View, CA, USA) across Turkish dental faculties in October 2023. A total of 1,093 students participated. Group comparisons were performed with Kruskal-Wallis and Mann-Whitney U tests; the Chi-square test was used for categorical variables. Binary logistic regression identified independent predictors of adequate knowledge. Effect sizes were calculated using eta-squared (η²) and r. Results: A statistically significant difference in first-aid knowledge was identified across the three groups (p < 0.001). Adequate knowledge was demonstrated by 82.1% of specialist students, 61.8% of clinical students, and 41.7% of pre-clinical students. Overall, 35.5% of participants reported prior formal first-aid training, with the proportion differing significantly across groups (p < 0.001). Logistic regression identified training stage (specialist vs. pre-clinical: OR 5.39, 95% CI 3.32–8.77; clinical vs. pre-clinical: OR 2.15, 95% CI 1.61–2.85) and prior first-aid training (OR 1.40, 95% CI 1.06–1.84) as independent predictors. Sex was not significant (p = 0.175). Conclusions: First-aid knowledge in dental students is more closely tied to progression through training stages than to sex, yet the persistence of knowledge gaps among specialist students indicates that clinical seniority alone does not guarantee first-aid competence. These findings support treating first-aid proficiency as an outcome to be deliberately verified at successive stages of dental training rather than assumed to accrue with experience.
