WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collections
Permanent URI for this collectionhttps://hdl.handle.net/20.500.13091/2
Browse
Search Results
Article Volcanic and Cultural Geoheritage Potential of Erenlerdağ-Alacadağ Volcanism (SW of Konya-Türkiye)(TMMOB Jeoloji Muhendisleri Odasi, 2026) Korkmaz, Gulin Gencoglu; Ercan, Hatice UnalThe Erenlerdağ–Alacadağ Volcanic Complex (ErAVC), located in southwest Konya (Central Anatolia), represents a Neogene-aged volcanic unit covering approximately 1500 km². The EAVC is composed of volcanic products that range in composition from mafic to felsic, including lava domes, lava flows, pyroclastic fall and flow deposits, and subvolcanic intrusions such as dikes and plugs. The present study aims to identify and characterize representative volcanic geosites within the ErAVC, assess their geoheritage value, and discuss their potential for geotourism and educational development in the context of Central Anatolian Volcanic Geoheritage.Volcanic facies analysis reveals a wide range of eruptive behaviors, from the development of lava domes and lava flows and the formation of dacitic spine structures to ignimbrite-forming explosive volcanism and complex volcano-sedimentary processes, expressed across facies ranging from central/proximal to distal settings. In the proximal and medial facies, dacitic–andesitic lava flows, domes, their pyroclastic equivalents, and ignimbrite sequences display features indicative of multi-stage magma mixing, recharge events, and decompression-driven processes. Distal facies are characterized by tuff horizons, widespread ignimbrite, and sedimentary units, which clearly reflect the synchronous development of volcanic and sedimentary processes. These well-preserved successions provide rare and valuable archives for reconstructing eruption dynamics and magma chamber evolution in continental arc settings. The distribution of volcanic facies in the ErAVC documents a pronounced geomorphological contrast between high-relief areas associated with lava domes and lava flows, and lower-relief zones dominated by ignimbrites, tuff layers, and volcano-sedimentary units.Highly porous ignimbrites and tuff horizons in the medial-distal facies have facilitated settlement and construction activities throughout history, as exemplified by the rock-carved dwellings of the ancient city of Kilistra. The ancient settlement of Kilistra, located within the boundaries of the Erenlerdağ–Alacadağ Volcanic Complex (ErAVC), represents one of the rare geo-cultural heritage sites where volcanological, geomorphological, and archaeological components are integrated. The Late Hittite-period Fasıllar Monument, built upon resistant dacitic–andesitic lava flows, stands as a striking example of the integration of volcanic lithologies into the cultural landscape. In conclusion, the ErAVC is one of the most significant geosites in Central Anatolia, offering substantial potential for geoconservation, geoeducation, and sustainable geotourism. The region’s geological diversity and cultural assets serve as an “open-air laboratory” for multidisciplinary research and community engagement.Article Thermo-Mechanical Characterization of GFRP Molded Grating Composites Exposed to Elevated Temperatures(MDPI, 2026) Özkılıç, Yasin Onuralp; Özgün, Muhammed İhsan; Madenci, Emrah; Aksoylu, CeyhunThis study comprehensively investigates the thermal and mechanical degradation behavior of molded glass-fiber-reinforced plastic (GFRP) grating composites subjected to temperatures ranging from 80 °C to 320 °C. Three types of industrially produced GFRP gratings—open-type (OG), thin closed-skin (CG), and thick closed-skin (TCG)—were evaluated using mechanical, microstructural, chemical, and crystallographic analyses. Three-point bending tests revealed that TCG-type specimens exhibited superior thermal resistance, experiencing only a 43.9% loss in strength at 320 °C, whereas OG-type specimens showed significant resin degradation, fiber–matrix decomposition, and microcrack formation at temperatures above 200 °C. Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR) analyses revealed significant resin degradation, fiber–matrix decomposition, and microcrack formation. Thermogravimetric analysis (TGA) and Differential Scanning Calorimetry (DSC) confirmed substantial mass loss and structural disintegration at temperatures above 200 °C. Dynamic Mechanical Analysis (DMA) results revealed that the glass transition temperature (Tg) occurred at approximately 115–120 °C. The second-order regression model developed to estimate flexural strength under increasing temperature provided high accuracy (R2 > 0.99) for all grating types. It should be noted that this investigation focuses on the short-term thermo-mechanical response under fundamental flexural loading to provide an accurate baseline for preliminary engineering design. The findings emphasize that the effect of temperature should be considered a critical parameter in the structural design of GFRP systems, especially in industrial environments with temperatures above 120 °C. Accordingly, tables for material selection and load-carrying capacity should be recalibrated to account for short-term temperature effects.Article The Comparison of Fuzzy Inference System and the Bees Algorithm for Optimal Design of Balancing Hole of Centrifugal Pump Impeller(Konya Teknik Univ, 2026) Acar, Osman; Sefaci, Selahattin; Kalyoncu, Mete; Kodak, Saim; Koçak, SaimThis study presents a comprehensive comparison of two distinct computational approaches, Fuzzy Inference System (FIS) and The Bees Algorithm (BA) for optimizing the design of balancing holes in centrifugal pump impellers. These holes are essential for reducing axial thrust without compromising hydraulic efficiency. The optimization parameters include hole center angle, hole diameter, radial placement, and the number of holes. By employing computational fluid dynamics (CFD) simulations, a data-driven regression model was derived from 111 configurations of a TKF 125-400 pump model. The Mamdani-type FIS uses triangular and trapezoidal membership functions and linguistic rules, while the BA, inspired by the foraging behavior of honeybees, utilizes a swarm intelligence approach for multi-objective optimization. Comparative performance is evaluated based on axial thrust minimization and efficiency retention. The findings suggest that while BA provides superior optimization accuracy, the FIS offers greater speed, interpretability, and adaptability for real-time applications in pump design.Article Sustainability Assessment: Environmental Impacts and Economic Performance of Bio-Based and Mineral-Based Cutting Fluids(Wiley, 2026) Oksuz, Secil Tutar; Tutar Oksuz, Secil; Divarci, Aybala BetulAbstract Machining is an important manufacturing process that can cause significant environmental impacts, particularly in terms of energy consumption, waste generation, and emissions. This study evaluates the environmental performance of two types of cutting fluids, bio‐based and mineral‐based, using a comprehensive life cycle assessment (LCA). A comparative analysis is conducted to quantify emissions associated with each fluid, assess their contributions to selected environmental impact categories, and examine the related economic aspects. The aim of this study is to evaluate the potential environmental benefits and drawbacks of replacing conventional mineral‐based cutting fluids with bio‐based alternatives in machining processes. The results indicate that bio‐based oil exhibits higher environmental impacts than mineral‐based oil across most impact categories, particularly global warming potential (GWP), acidification potential (AP), and smog creation potential (SCP), which can be explained by sectoral contributions identified using the Economic Input–Output Life Cycle Assessment (EIO‐LCA) approach. External normalization using US normalization factors shows that human health non‐cancer potential (HHNCP) and human health cancer potential (HHCP) are the most significant relative impact categories for both fluids. In economic terms, mineral‐based cutting fluid shows higher economic output (2.05 million USD) than bio‐based cutting fluid (1.63 million USD), mainly due to the capital‐intensive nature of petroleum refining and extraction sectors and their extensive inter‐industry linkages.Article Selection of Low Environmental Risk Processes in Plastic Waste Recovery by Comparative Life Cycle Assessment(Wiley, 2026) Kalem, Merve; Göktepeli, GamzeAbstract This study investigates the environmental impact of different valorization methods for solid and liquid products obtained from thermochemical recycling of high‐density polyethylene (HDPE) plastic waste and the mechanical recycling of these wastes. In this context, the mechanical recycling of HDPE plastic waste to produce granular raw materials (MechRecyc) and the chemical recycling of HDPE plastic waste to produce epoxy composite materials from pyrolysis chars (Pyro‐Epoxy) were discussed. Comparative life cycle analyses were conducted using SimaPro software, considering midpoint and endpoint categories for all three processes. MechRecyc performed best in terms of impact categories describing global warming, human toxicity and ecotoxicity, and fossil resource depletion. Pyro‐Fuel had the most positive impact in terms of pollutant discharges and clean water consumption. Considering all environmental impact categories, mechanical recycling had the most positive environmental impact, while both pyrolysis‐based recycling methods were found to have very similar impacts.Article Search for Soft Unclustered Energy Patterns Produced in Association with a W or Z Boson in Proton-Proton Collisions at √s=13 TeV(Elsevier, 2026) Gribush, ; Hayrapetyan, A.; Bergaür, T.; Benato, L.; Makarenko, V.; Tumasyan, A.; Adam, W.A search for a Higgs boson produced in association with a W or Z boson and decaying via a soft unclustered energy pattern (SUEP) is presented. The analysis is based on proton-proton collision data corresponding to an integrated luminosity of 138 fb(-1) collected between 2016 and 2018 at the LHC. Final states with a leptonic W or Z boson decay associated with a high multiplicity of low-momentum charged particles are explored for the first time. The results show no significant excess over the standard model background expectation. Limits are set on the production cross section of a Higgs boson that decays to a SUEP, for a range of parameters of the SUEP model. Material is provided to facilitate further interpretation of the results.Article Search for Pair Production of Heavy Resonances in Final States with a Photon and Large-Radius Jets in Proton-Proton Collisions at √s=13 TeV(Amer Physical Soc, 2026) Voytishin, ; Hayrapetyan, A.; Andrejkovic, J. W.; Benato, L.; Makarenko, V.; Tumasyan, A.; Adam, W.A search for the pair production of heavy spin-1/2 or spin-3/2 resonances (t*) in proton-proton collisions at root s = 13 TeV is presented. Data collected with the CMS detector at the CERN LHC from 2016 to 2018 corresponding to an integrated luminosity of 138 fb(-1) are used. The analysis targets benchmark signal scenarios where one t* decays into a top quark (t) and a photon (gamma), and the other into a t quark and a gluon (g), i.e., pp -> t*(t*) over bar -> tt gamma g. All-hadronic final states from the t pair decay chain are selected using jet substructure techniques. The signal is probed as a function of the t* candidate mass, which is reconstructed using the photon and a top quark candidate jet. No significant deviation from the background-only hypothesis is found. Observed (expected) upper limits on the signal cross section at 95% confidence level are set, excluding masses of spin-1/2 t* particles below 930 (930) GeV and spin-3/2 t* particles below 1330 (1390) GeV. This analysis marks the first search for heavy resonances in the t (t) over bar gamma g channel. Exploiting the high-energy photon to reduce the backgrounds, this search achieves sensitivity competitive with p -> t*(t*) over bar -> t (t) over bar gg searches for spin-1/2 t* despite the small expected t* -> t gamma branching fraction.Article Search for Heavy Long-Lived Charged Particles with Level-1 Trigger Scouting Data from Proton-Proton Collisions at √s=13.6 TeV(Elsevier, 2026) Hayrapetyan, A.; Bergaür, T.; Benato, L.; Vellidis, K.; Makarenko, V.; Tumasyan, A.; Adam, W.A search for heavy long-lived charged particles at the LHC is presented. Particles traversing the CMS muon detector across several bunch crossings are searched for using a data sample of proton-proton collisions at root s = 13.6 TeV collected with the CMS detector in 2024, corresponding to an integrated luminosity of 3.7 fb(-1). This is the first search using the novel level-1 trigger scouting data set collected without any trigger selection, allowing correlations between bunch crossings to be analyzed. The results are interpreted as upper limits on the cross sections of several benchmark processes with pair production of heavy long-lived charged particles. Upper limits on the fiducial cross section of a heavy long-lived charged particle with p(T) > 500 GeV and vertical bar eta vertical bar < 0.83 are also set in different ranges of beta = upsilon/c. This analysis is a proof of concept for the level-1 trigger data scouting system and complements existing searches for heavy long-lived charged particles by extending the sensitivity to lower beta values.Article Search for Dark Matter Produced in Association with a Higgs Boson Decaying to Bottom Quarks in Proton-Proton Collisions at √s=13 TeV(Amer Physical Soc, 2026) Hayrapetyan, A.; Andrejkovic, J. W.; Benato, L.; Makarenko, V.; Tumasyan, A.; Adam, W.; Wang, Z.A search for dark matter particles produced in association with a Higgs boson decaying to a bottom quark-antiquark pair in proton-proton collisions at root s = 13 TeV is presented. The data, collected with the CMS detector at the LHC, correspond to an integrated luminosity of 101 fb(-1). The analysis is performed in exclusive categories targeting both Lorentz-boosted (merged) and resolved b jet pair topologies, covering a wide range of Higgs boson transverse momentum. A statistical combination is made with a previous search using data collected in 2016 and corresponding to an integrated luminosity of 35.9 fb(-1). The observed data agree with the standard model background predictions. Constraints are placed on models predicting new particles or interactions, such as those in the simplified frameworks of baryonic-Z ' and 2HDMthorn a, where the latter is a type-II two-Higgs-doublet model featuring a heavy pseudoscalar with an additional light pseudoscalar. Upper limits at 95% confidence level are set on the production cross section for these models. For the baryonic-Z ' model, Z ' boson masses below 2.25 TeV are excluded for a dark matter particle candidate mass of 1 GeV. In the 2HDM thorn a model, heavy pseudoscalar masses between 850 and 1300 GeV are excluded for a light pseudoscalar mass of 350 GeV.Article Search for a New Neutral Gauge Boson Produced in Association with One or Two b Jets and Decaying into a Pair of Muons in Proton-Proton Collisions at √s=13 TeV(Springer, 2026) Hayrapetyan, A.; Andrejkovic, J. W.; Chinellato, J.; Chekhovsky, V.; Makarenko, V.; Zhokin, A.; Tumasyan, A.; Adam, W.A bstract A search for a new neutral gauge boson, Z ′ , produced in association with one or two jets, including at least one b jet, and decaying into a pair of muons is presented. The analysis uses proton-proton collision data collected with the CMS detector at $$ \sqrt{s}=13 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml:mn> </mml:math> TeV, corresponding to an integrated luminosity of 138 fb − 1 . No significant deviation from background expectations is observed. Upper limits at 95% confidence level on the product of cross section, branching fraction to dimuons, acceptance, and efficiency, from 0.2 to 2 fb, are set for Z ′ boson masses between 125 and 350 GeV. Process-dependent products of acceptance and efficiency, and model-independent limits on the signal yield are provided. These are the only results to date in the 125–200 GeV mass range and the most stringent for b quark fusion production modes in the 200–350 GeV range, complementing inclusive Z ′ boson searches.