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Öğe Constraints on the higgs boson self-coupling from the combination of single and double higgs boson production in proton-proton collisions at √s=13 tev(Elsevier, 2025) Hayrapetyan, A; Tumasyan, A.; Adam, W.; Andrejkovic, J. W.; Bergauer, T.; Chatterjee, S.; Sağır, SinanThe Higgs boson (H) trilinear self-coupling, lambda(3), is constrained via its measured properties and limits on the HH pair production using the proton-proton collision data collected by the CMS experiment at root s = 13 TeV. The combination of event categories enriched in single-H and HH events is used to measure k(lambda), defined as the value of lambda(3) normalized to its standard model prediction, while simultaneously constraining the Higgs boson couplings to fermions and vector bosons. Values of k(lambda) outside the interval -1.2 < k(lambda) < 7.5 are excluded at 2 sigma confidence level, which is compatible with the expected range of -2.0< k(lambda) < 7.7 under the assumption that all other Higgs boson couplings are equal to their standard model predicted values. Relaxing the assumption on the Higgs couplings to fermions and vector bosons the observed (expected) k(lambda) interval is constrained to be within -1.4 < k(lambda) < 7.8 (-2.3 < k(lambda) < 7.8) at 2 sigma confidence level.Öğe A machine learning-based real-time remaining useful life estimation and fair pricing strategy for electric vehicle battery swapping stations(İeee-Inst Electrical Electronics Engineers İnc, 2025) Çeltek, Seyit Alperen; Kul, Seda; Polat, A. Ozgur; Zeinoddini-Meymand, Hamed; Shahnia, FarhadThe increasing adoption of electric vehicles (EVs) has led to the widespread implementation of battery swapping stations. However, ensuring fairness in battery pricing remains a significant challenge since variations in battery health and performance among swapped batteries can result in user dissatisfaction and operational inefficiencies. This paper introduces a novel approach to enhance fairness in battery swapping by integrating a machine learning-based real-time prediction model with a pricing strategy based on remaining useful life (RUL) estimation to address this issue. The proposed solution comprises a real-time RUL estimation system and a dynamic pricing mechanism that ensures fair pricing based on battery health and performance. This integrated approach aims to improve user satisfaction and the operational efficiency of swapping stations. The paper evaluates various machine learning algorithms for real-time RUL estimation regarding accuracy, computation time, and memory usage. The results suggest that XGBoost provides the most suitable balance between accuracy and efficiency, making it an effective solution for real-world applications. Comparative analysis shows that the XGBoost model outperforms the second-best method (Random Forest) with a lower error (3.50 vs 3.79) while maintaining competitive computational efficiency (9.75 vs 8.52 seconds) and memory usage (2.12 vs 2.32 MB) when solving a typical numerical case study problem. The proposed approach has the potential to accelerate the adoption of electric vehicles and contribute to sustainability goals by promoting efficient battery utilization and fair pricing mechanisms.Öğe Investigation of the effects of rib application on cooling in a turbine blade(Konya Teknik Üniv, 2025) Tolu, Muhammed Emin; Babayigit, Osman; Özen, Dilek NurTurbine blades are system components exposed to extremely high temperatures. Effective cooling of turbine blades is essential to enhance efficiency and extend the operational lifespan of gas turbines. In this study, a new rib turbulator cooling design was tested for the NASA C3X turbine blade. The analyses were compared with those conducted on non-ribbed blades. According to the findings, an average surface temperature of 574.6 K and a maximum surface temperature of 661.8 K were achieved. These values indicate a cooling efficiency of 19.1% for the leading edge, which is exposed to the maximum temperature, and 29.75% for the average surface temperature. All data obtained from the study have been shared in the form of figures and graphs.Öğe On a solvable difference equations system(Üniv Nis, 2025) Aktaş, Ömer; Kara, Merve; Yazlık, YasinIn this paper, we study three dimensional system of difference equations. Firstly, we examine the solutions of the mentioned system depending on whether the parameters are equal to zero or non-zero. In addition, the solutions of this system are obtained in closed form. Finally, we also describe the forbidden set of the solutions of the system of difference equations.Öğe Copper extraction from deep eutectic solvent as atacamite by hydrolysis method(Konya Teknik Üniv, 2025) Topçu, Mehmet AliDeep eutectic solvents (DESs) have garnered as promising alternatives to conventional solvents for metal extraction due to their facile synthesis, high chloride concentration, non-aqueous nature, and low cost. This work explores a green route for ultrafast extraction of atacamite [Cu2Cl(OH)3] from a deep eutectic solvent at room temperature in a short time using copper (II) sulfate pentahydrate as a precursor. The phase, chemical, morphological, and structural properties of the extracted atacamite were investigated using XRD, Rietveld method, SEM-EDX, and FTIR techniques. As a result of XRD analysis, it was determined that the atacamite with an average diameter of 85.59 mu m has an orthorhombic crystal structure. Also, it was determined that the crystal structure parameters obtained from XRD and the theoretical calculations of these values were in good agreement according to the Rietveld refinement. SEM/EDX analysis showed that the extracted atacamite particles exhibited heterogeneity in terms of size and morphology, while elemental composition was found to be homogeneous throughout the particles. UV-Vis analysis and theoretical calculations, the optical band of atacamite particles was found as 2.72 eV. Also, this study demonstrates that the hydrolysis method can serve as an efficient, low-energy pathway for the recovery of metals from DESs, highlighting its potential as a novel approach in copper metallurgy.Öğe Defect passivation and crystallization management enabled by thulium dopant as b-site cation for highly stable and efficiency fully inorganic perovskite solar cells with over 17% efficiency(Elsevier B.V., 2025) Camızcı, Ebubekir; Dilci, Ibrahimhan; Xiao, Zhengguo; Sönmezoğlu, SavaşDespite their outstanding thermal stability and optimal band gap for tandem devices, the development of high-performance CsPbI2Br-based inorganic perovskite solar cells is considerably hampered by defect-induced nonradiative recombination and halide ion migration. Herein, we have developed a series of CsPbI2Br inorganic perovskite materials modified by incorporation of thulium (Tm3+) ions as B-site heterovalent dopants and explored their favourable impacts on the photovoltaic and stability performance of fully inorganic perovskite solar cells (FTO/SnO2/CsPb1-xTmxI2Br/CuSCN/r-GO/Au) for the first time. The champion solar cell achieves an impressive efficiency exceeding 17 %, with less degradation (<5%) after 400 h of operational stability and ∼30 % after 320 h of shelf stability owing to suppression of nonradiative recombination of carriers and inhibition of halide ion migration by controlling crystallization and phase stabilization. Overall, Tm3+ ions do not play a role only elimination of ion migration and defects in perovskite film but also protects perovskite layer from moisture and continuous light illumination in fully inorganic perovskite solar cells. © 2025 Elsevier B.V.Öğe Abdominal compliance may influence intracranial pressure(Springer Japan Kk, 2025) Yarımoğlu, Rafet; Başaran, BetülWe read with interest the recently published article by Kim et al., which speculates the relationship between obesity and optic nerve sheath diameter (ONSD) in patients undergoing laparoscopic gynecological surgery [1]. As the authors note, high abdominal pressure levels may further elevate intracranial pressure (ICP) during the steep Trendelenburg position and pneumoperitoneum. In the current article, Kim et al. stated they accepted patients with a history of ophthalmological, cerebrovascular, or brain tumor surgery as exclusion criteria. However, patients with a history of abdominal surgery or pulmonary diseases were not accepted as an exclusion criteria. This may complicate the results in this article somewhat. Understanding abdominal compliance (AC) is essential for grasping the efects of mentioned factors on abdominal pressure [2]. AC is defned as a change in abdominal volume per alteration of the intraabdominal pressure. Previous abdominal surgery may change abdominal compliance by gradually pre-stretching the abdominal muscles or decreasing the distensibility of the abdominal wall by scarring the muscle fbers and fascial layers [3]. On the other hand, these patients' compliance changes are observed less during surgery than in those without prior surgical experience [3]. Additionally, abdominal compliance (AC) is associated with not only altering the capacity of the abdominal wall but also with the stretching and pressurization capabilities of the diaphragm, which could be afected in individuals with chronic pulmonary lung disease [4]. This may impact ICP and ONSD by causing changes in thoracoabdominal pressure. Another noteworthy point in the article is that the cut-of value of body mass index (BMI) for classifying individuals as obese or non-obese is set at 30 kg/m2 . Therefore, the nonobese group also includes the data for overweight patients (BMI, 25 kg/m2 to 29.9 kg/m2 ). To clearly distinguish the impact of obesity on ONSD, it would be ideal to focus exclusively on individuals with a BMI above 30 kg/m2 for those classifed as obese and below 25 kg/m2 for those considered non-obese. This approach will efectively highlight the differences between these two groups [5]. This way, it can highlight the diferences between these two groups meaningfully. Based on the above, it may be more suitable to mention the surgical and pulmonary histories of patients. It would be more appropriate not to include overweight patients in the non-obese group to show the actual efect of obesity on ONSD during laparoscopic gynecological surgeries.Öğe CD19 Deficiency Leads to Dysregulation of Phosphoinositide 3-Kinase-Protein Kinase B (PI3K/AKT) and Nuclear Factor Kappa B (NF-κB) Pathways: Implications for B-Cell Maturation and Immune Function(Erciyes Üniv Sch Medıcine, 2025) Küçcüktürk, Serkan; Karaselek, Mehmet Ali; Duran, Tugce; Reisli, IsmailObjective: CD19 is a cellular receptor belonging to the immunoglobulin (Ig) superfamily and serves as a critical signaling component in B-cells differentiation and activation. This study investigates gene expression changes in the phosphoinositide 3-kinase/protein kinase B (PI3K/AKT) and nuclear factor kappa-light-chain-enhancer of activated B cells (NF-kappa B) pathways in patients with CD19 deficiency. The role of CD19 in B-cell function was explored, along with its potential impact on these signaling pathways and the overall immune response. Materials and Methods: RNA samples were obtained from three patients diagnosed with CD19 deficiency, as well as heterozygous carriers and healthy controls. Gene expression profiles related to the PI3K/AKT axis and NF-kappa B pathway were analyzed using quantitative polymerase chain reaction (PCR). Results:The study revealed significant alterations in the expression of signaling pathway components, including PI3K, phosphoinositide-3-kinase regulatory subunit 1 (p85),TNF receptor-associated factor 2 (TRAF2), forkhead box O1 (FOXO1), and NF-kappa B, in CD19deficient patients. While PI3K and NF-kappa B expression were significantly downregulated in these patients, CD19, p85, FOXO1, and TRAF2 expression were markedly upregulated. These changes suggest impaired B-cell function, leading to weakened immune system responses. Conclusion: CD19 deficiency disrupts B-cell receptor signaling, resulting in significant alterations in the PI3K/AKT axis and NF-kappa B pathways. These disruptions impair B-cell maturation and survival, ultimately leading to compromised immune responses. This study provides the first detailed molecular insights into the effects of CD19 deficiency, enhancing our understanding of how these signaling pathways regulate immune function.Öğe Nutritional determinants of health-related quality of life in community-dwelling and institutionalized older adults: nutritional assessment scores, dietary acid load, and anthropometric measurements(Modestum Ltd, 2025) Kanbur-Usug, Aslı; Acar-Tek, Nilüfer; Adıgüzel, EmreAim: This study aimed to investigate the relationship between nutritional parameters and health-related quality of life in institutionalized and community-dwelling older adults. Methods: The Mini Nutritional Assessment (MNA) and Short Nutritional Assessment Questionnaire 65+ were used as nutritional assessment tools. The three-day dietary record was used to determine nutrient intakes and the data were analyzed in the Nutrition Information System, a food analysis software. Anthropometric measurements related to nutritional status were also recorded. The Short-Form-36 (SF-36) health-related quality of life scale was used to assess life quality. Results: Correlation analysis showed that SF-36 physical component scores were negatively associated with body mass index (BMI) and SF-36 mental component scores were positively associated with MNA in communitydwellingolderadults. In institutionalized older adults, both SF-36 scores were positively correlated with MNA and muscle mass. Furthermore, multiple linear regression analyses showed that both SF-36 scores were positively associated with MNA and negatively associated with BMI in all participants. However, dietary acid load was not significantly associated with SF-36 scores. Conclusions: The MNA was almost the only nutritional parameter positively correlated with SF-36 physical and mental component scores. Therefore, it is thought that MNA, a nutritional assessmenttool, can also be considered in assessing quality of life.Öğe Bilateral cross hashing image retrieval based on principal component analysis(Springer Heidelberg, 2025) Yılmaz, AhmetImage retrieval (IR) has become a crucial challenge in computer vision with the exponential growth of digital imagery. The existing methods employ a single hash source, which may overlook deep details in the image, and they struggle to handle the complexity and diversity of modern visual data. This study addresses this limitation by proposing a novel deep hashing-based IR method named bilateral cross hashing based on principal component analysis (BCHP). Bilateral cross hashing based on principal component analysis-image retrieval (BCHP-IR) employs the feature extraction capabilities of residual network-50 (ResNet-50) and the dimensionality reduction and information preservation properties of principal component analysis (PCA). The method extracts high-level features from query images using ResNet-50 and then compresses both features and class labels using PCA. The compressed data undergoes quantization to generate binary codes. These "bilateral" hash codes are combined to capture deep features and compared with image codes in the database. The BCHP-IR's effectiveness is demonstrated through extensive comparative analysis against reported methods, achieving superior performance metrics. On the MS-COCO dataset, BCHP-IR achieves mAP scores that are higher than the average of other benchmark algorithms by 6.3, 6.4, 6.2 and 5.0 at hash lengths of 16, 32, 48 and 64, respectively. These enhancements at those hash lengths are 4.6, 4.7, 4.8 and 4.3 for the NUS-WIDE dataset and 3.9, 2.9, 2.5 and 2.1 for the ImageNet dataset. Therefore, the proposed BCHP-IR method harnesses the power of ResNet-50 and PCA and offers a promising solution for efficient and effective image retrieval.Öğe Cardiovascular disease markers in schizophrenia during negative symptoms and remission periods(Mdpi, 2025) İmre, Okan; Imre, Gurkan; Muştu, Mehmet; Acat, Ömer; Kocabaş, RahimObjectives: This study aims to investigate cardiovascular disease markers in patients with schizophrenia and to contribute to the early indication of asymptomatic cardiovascular diseases in these patients. In our study, there are three groups: schizophrenia with negative symptoms (SCH-N), schizophrenia in remission (SCH-R), and a healthy control group (HC). In these groups, there were compared parameters such as lipid panel, Atherogenic Index (AIP), Triglyceride-glucose (TyG) index, Castelli Risk Index-1 (CRI-I), Castelli Risk Index-2 (CRI-II), and Atherogenic Coefficient (AC), which are associated with the risk of cardiovascular disease. Methods: The participants of the study were from the HC group and schizophrenia patients aged between 18 and 65 who were followed up at the Psychiatry Clinic of Karaman Hospital. This cross-sectional case-control study consists of the SCH-N (n:20), the SCH-R (n:23), and the HC (n:21) groups. Those with cardiovascular, endocrine, and inflammatory diseases, those with alcohol and substance addiction, those using drugs other than psychiatric drugs, and those lacking informed consent were excluded from the study. Patients in active psychotic episodes were also excluded from the study due to communication difficulties. All data were analyzed using SPSS 25.0 package program in a computer environment. The conformity of continuous data to normal distribution was evaluated with normality test value, q-q plot, skewness, and kurtosis. For significant results in the ANOVA test, pairwise comparisons were conducted using the post hoc Bonferroni correction when variances were homogeneously distributed. Similarly, for significant results in the Kruskal-Wallis Test, pairwise comparisons were performed using the Dunn-Bonferroni test. In this study, values less than p < 0.05 were considered statistically significant. Results: When all groups were compared, the increase in the TGs, TyG index, AIP, CRI-I, CRI-II, and AC values in the SCH-R group compared to the HC group was found to be statistically significant (p < 0.001, p < 0.001, p < 0.001, p < 0.001, p = 0.015, p < 0.001; sequentially). Conclusions: This study revealed that cardiovascular risk markers in schizophrenia patients showed significant differences. In particular, the elevation in parameters such as TGs, TyG index, AIP, CRI-I, CRI-II, and AC indicates that schizophrenia patients have an increased risk for cardiovascular diseases. Therefore, it is recommended that schizophrenia patients be closely monitored for cardiovascular risk factors and to intervene early.Öğe Kinect-based anthropometric measurements: a comparative analysis of traditional methods in youth female weightlifters(Bmc, 2025) Örücü, Serkan; Işık, Bülent; Erdağı, Kenan; Osmanoğlu, Usame Ömer; Özbay, ErkanBackgroundThe importance of anthropometric measurements for monitoring the physical development of athletes and optimizing training programs is well known. Considering the limitations of traditional methods in terms of accuracy and consistency, the aim of this study is to investigate the potential of Kinect V2 as an alternative.MethodsThis study wasperformed on 12 youth female weightlifters who won medals in the Youth European Weightlifting Championship. Humerus length, forearm length, hand length, trochanter-tibiale laterale length, tibial length and shoulder width measurements were performed with both Kinect V2 and manual methods. Statistical differences between groups were evaluated using the Mann-Whitney U test. The consistencies of the measurement methods were analyzed with Bland-Altman plots, correlations were determined with Pearson correlation coefficients, and reliability were evaluated with Intraclass Correlation Coefficient (ICC) values.ResultsKinect V2 provided accuracy and consistency comparable to manual methods in measurements of humerus (ICC = 0.532), forearm (ICC = 0.600), and hand length (ICC = 0.760). While medium-level concordance was observed in trochanter-tibiale lateral length measurements (ICC = 0.749), high-level concordance and reliability were found in tibial length (ICC = 0.914) and shoulder width (ICC = 0.869) measurements.ConclusionsThere were significant differences between the results of humerus length, forearm length and trochanter-tibiale laterale length obtained with both measurement methods. Therefore, measurements of these parameters require significant care. Findings of this study suggest that Kinect V2 can be a reliable tool for rapid and practical anthropometric assessments in sports settings, but highlight the importance of careful calibration and adjustments for specific measurements. Future studies should examine the use of this device more comprehensively across different sports and populations.Öğe Girth and groomed radius of jets recoiling against isolated photons in lead-lead and proton-proton collisions at √snn=5.02 tev(Elsevier, 2025) Hayrapetyan, A.; Tumasyan, A.; Adam, W.; Andrejkovic, J. W.; Bergauer, T; Sağır, SinanThis Letter presents the first measurements of the groomed jet radius R-g and the jet girth g in events with an isolated photon recoiling against a jet in lead-lead (PbPb) and proton-proton (pp) collisions at the LHC at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The observables R-g and g provide a quantitative measure of how narrow or broad a jet is. The analysis uses PbPb and pp data samples with integrated luminosities of 1.7 nb(-1) and 301 pb(-1), respectively, collected with the CMS experiment in 2018 and 2017. Events are required to have a photon with transverse momentum p(T)(gamma) > 100 GeV and at least one jet back-to-back in azimuth with respect to the photon and with transverse momentum p(T)(jet) such that p(T)(jet)/p(T)(gamma) > 0.4. The measured R-g and g distributions are unfolded to the particle level, which facilitates the comparison between the PbPb and pp results and with theoretical predictions. It is found that jets with p(T)(jet)/p(T)(gamma) > 0.8, i.e., those that closely balance the photon p(T)(gamma), are narrower in PbPb than in pp collisions. Relaxing the selection to include jets with p(T)(jet)/p(T)(gamma) > 0.4 reduces the narrowing of the angular structure of jets in PbPb relative to the pp reference. This shows that selection bias effects associated with jet energy loss play an important role in the interpretation of jet substructure measurements.Öğe Consistency problems of conformal killing gravity(Amer Physical Soc, 2025) Altaş, Emel; Tekin, BayramWe show that gravity field equations based on a tensor with rank greater than 2 have consistency problems in the sense that integration constants in the solutions, such as the parameter m in the Schwarzschild metric, do not allow for an interpretation in terms of conserved quantities in the theory. The recently introduced conformal Killing gravity, an interesting extension of general relativity that inherits all the solutions of the latter, and defined with a rank-3 tensor field equation that does not arise from a diffeomorphism-invariant action, is plagued with this problem. In this theory, it is not clear at all how one can define the energy and angular momentum for black hole solutions, or define the analogs of the formulas, such as the quadrupole formula, in the weak field limit for gravitational waves emitted by compact sources.Öğe Struggling to exist between ethics and cronyism: the dilemma of unappointed doctoral graduate academics(Springer, 2025) Aytar, Oğuzhan; Çil, UmutThe active involvement and inclusion of young scholars within established higher education systems are crucial for cultivating dynamism, fostering innovation, and ensuring the long-term sustainability of educational institutions. However, while some academic communities effectively harness the potential of young scholars, optimizing the benefits of their contributions, others fail to do so, leading to underutilized potential. This disparity warrants extensive research and examination. Cronyism, defined as the preferential treatment of certain groups through informal networks, undermines meritocracy and creates systemic inequalities in academic appointments and promotions. In T & uuml;rkiye, this issue is particularly significant due to the centralized structure of higher education and the influence of political and personal networks on academic decision-making.This research investigates the correlation between specific academic challenges such as limited access to resources, lack of mentorship, and inequitable opportunities, and the occurrence of cronyism, as well as explores the connection between cronyism and the career stagnation, job dissatisfaction, and psychological stress experienced by young academics. A qualitative research method was employed, and data were collected through interviews with 10 participants who were not appointed despite their success. The findings suggest that governmental interference in university administrations and policies threatens academic integrity and the protection of academic principles. Specifically, the study highlights that political appointments, biased funding allocation, restrictions on academic freedom, curricular interventions, and the manipulation of admission processes undermine academic integrity and principles. This study emphasizes the urgent need for transparent, merit-based appointment systems to address the detrimental effects of cronyism and foster a culture of academic ethics and fairness.Öğe The influence of the national culture on the association between school leadership and teacher commitment: a systematic review and meta-analysis(Turkish Educational Admin Research, 2025) Selvitopu, Abdullah; Kaya, Metin; Aydin, Ahmet TaylanThe present study was an attempt to examine the influence of national culture on the association between school leadership and teacher commitment. We systematically reviewed the literature on school leadership and teacher commitment, then followed a meta-analytic process by combining the data from the included studies and finally conducted meta-regression procedures to identify the main cultural predictors of the association between the two variables using Hofstede's (2011) theoretical model of cultural dimensions. Our findings suggest that there is a moderate positive relationship between school leadership and teacher commitment, that certain leadership styles are important in this relationship, and that power distance and individualism have negative influences on this association. Masculinity, uncertainty avoidance, long-term orientation and indulgence dimensions do not influence the association between school leadership and teacher commitment. We discussed the research findings and proposed recommendations for future research.Öğe Examining scholar-level publishing performance across bibliometric databases by cluster analysis(2025) Pişirgen, Ali; Öztünç, Fatih; Peker, SerhatPurposeThe purpose of this paper is to investigate the publishing characteristics of scholars across three popular bibliographic databases, namely, Google Scholar, Web of Science and Scopus, that allow the publication output and impact of scholars to be evaluated from a data-centric perspective.Design/methodology/approachA cluster analysis was conducted on the bibliometric and demographic data of 4,054 scholars, sampled from 23 academic division in seven Turkish universities. Among various clustering algorithms, this study applies Ward's hierarchical clustering method to group scholars based on the publication characteristics. Moreover, this paper conducted cross-analyses on their academic divisions and titles to provide a more comprehensive evaluation of their scholarly performance.FindingsThe cluster analysis resulted in four distinct groups of scholars having different publication and citation patterns across three major databases. The results indicate that for all clusters, there is a decline in scholars' publication performance as this paper move from the Google Scholar database to the Scopus and Web of Science databases. The study results indicate that highly productive and influential scholars are affiliated with Medicine, Natural Sciences and Engineering, while less productive scholars are affiliated with Humanities, Educational Sciences and Administrative, Political and Applied Sciences.Originality/valueThis study contributes to prior literature by exploring and profiling the individual scholar's publication performances in prominent bibliographic databases. It is also precious that the findings of this study offer useful information on scholarly publication characteristics in major databases and can be valuable for policymakers and scholars.Öğe Modeling, prediction, and optimization of pump system efficiency: A comparative study of machine learning methods and response surface method(SAGE Publications Ltd, 2025) Orhan, Nuri; Kaya, EnderThis study explores the interrelationship between pump performance, system efficiency, and noise/vibration levels by analyzing the influence of pump frequency and outlet pressure. System efficiency predictions were conducted utilizing both the Response Surface Method (RSM) and advanced machine learning algorithms, including Artificial Neural Networks (ANN), Support Vector Machines (SVM), and XGBoost. The comparative analysis revealed that ANN provided the highest prediction accuracy with an R2 value of 0.946, Root Mean Square Error (RMSE) of 1.2% and Mean Absolute Percentage Error (MAPE) of 2.32%. However, when predicting system efficiency using external data inputs, RSM outperformed other models, achieving an R2 value of 0.96 and a mean error rate of 3.84%. Optimization via RSM was performed for target flow rates of 35, 40, and 45 m3 h−1, with the optimal flow rate determined at 35 m3 h−1, corresponding to a system efficiency of 42%. To validate these optimization results, experimental tests were conducted, revealing a flow rate of 35.4 m3 h−1 and system efficiency of 42.95%, with error margins of 1.12% and 2.21%, respectively. The study demonstrates that RSM is a robust and effective tool for optimizing pump system performance, offering practical applications in improving energy efficiency and operational stability in pumping facilities. © IMechE 2025.Öğe İnvestigation of the stacking sequence and cutting parameters effect on hole morphology in hybrid fml composites(Elsevier Ltd, 2025) Doğan, Mehmet Akif; Yapıcı Ahmet; Gemi, Lokman; Yazman, Şakir; Morkavuk, Sezer; Köklü, UğurFiber metal laminates (FMLs) are widely used in a wide range of engineering applications, especially in the aerospace industry, due to their superior functional properties and low cost. In this experimental study, hybrid FML composite specimens consisting of five different Al2024/FRP/Al2024 stacked glass and carbon fiber layers were fabricated to investigate the effect of stacking sequences and cutting parameters on the drilling process. The drilling machinability properties of the specimens were investigated by considering the cutting force, torque, surface roughness and damage analyses in the hole after drilling and the results are presented comparatively. As a result of the experimental study, it was determined that the stacking sequences have a significant effect on the machinability. In terms of cutting forces, it was observed that the cutting force increased in carbon stacked areas and the cutting forces tended to decrease in glass stacks. In torque values, there is an increase in glass stacks and a decrease in carbon stacks. The highest roughness values were measured from all-glass stacked specimens. In hybrid composites, it was observed that glass stacks generally increased the surface roughness. © 2025 Elsevier LtdÖğe Flexible perovskite solar cells: a revolutionary approach for wearable electronics and sensors(Elsevier Ltd, 2025) Aftab, Sikandar; Koyyada, Ganesh; Ali, Zeeshan; Assiri, Mohammed A.; Kim, Jae Hong; Rubab, Najaf; Akman, ErdiFlexible perovskite solar cells (F-PSCs) and flexible perovskite modules (F-PSMs) are explored in detail in this extensive review article, with a particular emphasis on their revolutionary potential to transform solar energy solutions for wearable electronics and sensors. As an alternative to traditional solar technologies, F-PSCs offer unmatched promise thanks to their attributes, which include high efficiency, flexibility, stability, and durability. This comprehensive review assesses the scalability and manufacturability of F-PSCs by delving into their structural complexities, operational principles, and recent advances in materials and fabrication techniques. The operational principles and structural details of F-PSCs are explained, along with updates on materials and fabrication technology developments. This paper examines the emerging uses of F-PSCs in wearable electronics and sensors, highlighting their advantages over conventional silicon-based solar cells and their lightweight design that allows for compatibility with flexible substrates. The difficulties and potential paths for improving the stability and efficiency of F-PSCs are also discussed, highlighting the critical role that these devices play in the development of wearable electronics and renewable energy technologies. © 2025 Elsevier Ltd
