Karamanoğlu Mehmetbey University
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Machine learning-driven analysis of activation energy for metal halide perovskites
No full textMetal halide perovskite single crystals (MHPSCs) are highly promising materials for optoelectronic applications, but their stability is hindered by ion migration, thereby impacting their performance. A key factor to understand this issue is calculating the activation energy. Electrochemical Impedance Spectroscopy (EIS) is a powerful technique for separating ionic and electronic processes, yet traditional analysis is labour-intensive, involving extensive measurements, circuit fitting, and manual data interpretation. In this study, we introduce a machine learning (ML)-driven approach to fully automate EIS analysis. EIS data, collected for MAPbI3 and MAPbBr3 across temperatures from 263 K to 343 K, enabled the creation of a large database. The developed ML model predicts EIS spectra at unknown temperatures, fits the appropriate electrical circuit, and automatically extracts passive component values to calculate the activation energy via an Arrhenius plot. This automated workflow streamlines the calculation process, offering fast and reliable activation energy predictions even when temperature data are incomplete or missing. Our approach enhances the efficiency of EIS analysis, providing valuable insights into the stability and performance of MHP SCs
The effect of weight-related self-stigma on sexual functioning in obese women with type 2 diabetes
No full textThis study aims to determine the relationship between weight-related self-stigma and sexual function in obese women with type 2 diabetes. This is a descriptive correlational study. The study reached 236 women through social media between December 2023 and April 2024. In data collection, a descriptive information form, the Weight Self-Stigma Questionnaire (WSSQ), and the Female Sexual Function Inventory (FSFI). The mean total score of the women on the Weight Self-Stigma Questionnaire was 32.78±10.00 and the mean total score on the Female Sexual Function Inventory was 22.38±4.08. Sexual dysfunction was identified in 70.8% of the women. We found that women with type 2 diabetes exhibited high levels of weight-related self-stigma and sexual dysfunction. Additionally, the findings indicated a negative correlation between self-devaluation and fear of enacted stigma and lubrication and sexual pain. However, self-stigma about weight and sexual dysfunction were not significantly related. It is recommended to determine the prevalence of weight bias and sexual dysfunctions among obese women with diabetes, and to provide adequate support by health professionals, in order to prevent negative effects on their mental health and sexual functions
İnvestigation of the stacking sequence and cutting parameters effect on hole morphology in hybrid fml composites
No full textFiber 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 Lt
The influence of the national culture on the association between school leadership and teacher commitment: a systematic review and meta-analysis
No full textThe 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
A comprehensive investigation into the influence of variation in the stacking sequence on the mechanical behaviour and drilling machinability of basalt fiber-reinforced composite tubes
No full textIn composite materials, stacking of layers at different angles and changes in stacking sequence significantly affect not only the mechanical behavior but also the machinability characteristic of the composite structure. Therefore, the variation in stacking sequence represents a recent and important research topic in fiber-reinforced plastics. The objective of this study was to investigate the mechanical properties and drilling machinability characteristics of BFRP composite pipes in three different stackings: [±30/±60/±90]3, [±60/±90/±30]3 and [±90/±30/±60]3. The experimental results demonstrate that the stacking sequence has a significant effect on the mechanical behavior and drilling-induced damage formation. It is determined that the [±90/±30/±60]3 sample provided the highest performance in terms of mechanical properties but increased the thrust force during drilling. Furthermore, it is observed that the positioning of the ±90 layer has a considerable impact on both the mechanical and machinability outputs. © 2025 Elsevier Lt
Novel optical microcapsule sensor for effective recognition of Hg(Iı) and Ag (I) ions in the aquatic environments
No full textBecause conventional methods for the detection of heavy metal ions in water involve expensive equipment and complex procedures, there is a lot of interest in the improvement of simple and quick methods for determining heavy metal ions in water. Use of natural polymers as biosorbents such as sporopollenin for heavy metal removal is advantageous. There is an urgent demand to devise a simple method for the simultaneous detection of metal ions, especially in the case of mercury(II) and silver(I) coexisting among metals. Therefore, in this study, a fluorescent microcapsule sensor (SpT-P[5]-EB), the modified sporopollenin surface based-on a combination of Pillar[5]arene and Bodipy, was developed to detect silver(I) and mercury(II) ions simultaneously or separate with an on-off principle in the aquatic environment. The fluorescent microcapsule, SpT-P[5]-EB, indicated a high sensitivity and excellent selectivity for both silver(I) and mercury(II) ions with detection limits of 1.51 mu M and 0.72 mu M, respectively. The Hg(II) and Ag(I) ions may be detected simultaneously or individually using the SpT-P[5]-EB microcapsule sensor in easy, practical, and affordable procedures.We thank Karamanoglu Mehmetbey University and Selcuk Univer-sity for providing us with the laboratory and all other necessary resources
Midazolam premedication facilitates mask ventilation in children during propofol induction of anesthesia: a randomized clinical trial
No full textPurpose Mask ventilation is the most widely used method to provide ventilation during anesthesia induction.
Appropriate head and neck positions, exaggerated jaw lifts, two-hand and two-person ventilation, and the use of oral
or nasal airways can facilitate mask ventilation. Neuromuscular blockers and premedication drugs such as midazolam
and dexmedetomidine have also been proposed to facilitate mask ventilation. The hypothesis of this study was that
midazolam premedication would facilitate mask ventilation in children.
Methods Children aged 2–10 years were randomized into two groups. The midazolam group (Group M) received
an intravenous dose of midazolam premedication (0.1 mg/kg, maximum dose 3 mg), and the control group received
an intravenous dose of saline of the same volume (Group C). The primary outcome of the study was to examine the
effect of midazolam premedication on mask ventilation in children, using the Han mask grading scale.
Results The data of 120 children were analyzed (n=60 in Group M, n=60 in Group C). According to the Han mask
grading scale, the scores of the patients in the midazolam group were significantly lower than those of the control
group. The distribution of Han scores was significantly different between the groups (p<0.001). In the midazolam
group, 93.3% of the children had a Han score of 1 and 6.7% had 2, and in the control group, 60% had a score of 1,
and 40% had 2. In the subgroup analysis of overweight children, a Han score of 1 was determined in 91.7% of the
midazolam group and 61.1% of the control group (p=0.03).
Conclusion In conclusion, the results of this clinical research demonstrated that midazolam premedication improves
mask ventilation in children during general anesthesia induction. The findings also showed that the effect of
midazolam in facilitating mask ventilation was similar in overweight children.
Clinical trial registration The study was registered in clinicaltrials.gov (trial ID: NCT05368441 on 10/05/2022)
Nanofiber Applications From Hijiki Macroalgae: Antibacterial and Cytotoxicity Properties in Biocompatible Polymers
No full textOne of the current biotechnological applications is nanofiber applications made from algae using the electrospinning technique. Nanofibers containing poly-caprolactone (PCL) extracted from the brown seaweed Hijiki (Sargassum fusiforme) were prepared using electrospinning technique. Water extraction was performed to preserve the integrity of Hijiki components, ensuring their efficacy in subsequent electrospinning and characterization. The morphology and chemical composition of the nanofibers were characterized using field emission scanning electron microscopy (FE-SEM), thermogravimetric analysis (TGA), and Fourier transform infrared spectroscopy (FT-IR) analyses. Hijiki was found to combine well with electrospun biocompatible polymers and effectively provide the common properties of these materials. The cytotoxicity of algae-doped PCL nanofibers was examined in vitro using liver cancer and liver healthy cell lines (HepG2 and The-2). Among hepatic tumor cell lines, the HepG2 cell line has been preferred due to its wide range of scientific applications. Although the nanofibers caused a 28% decrease in liver cancer cell lines viability (HepG2), the decrease in healthy liver cell viability (The-2) was 12%. Algae-doped PCL nanofiber applied to bacteria showed antibacterial effect. Based on the findings, Hijiki macroalgae nanofibers show great promise for tissue regeneration and band-aid applications in the medical industry. © 2024 Wiley Periodicals LLC
High-throughput phenotyping of wheat root angle and coleoptile length at different temperatures using 3D-printed equipment
No full textBackgroundInnovation in crop establishment is crucial for wheat productivity in drought-prone climates. Seedling establishment, the first stage of crop productivity, relies heavily on root and coleoptile system architecture for effective soil water and nutrient acquisition, particularly in regions practicing deep planting. Root phenotyping methods that quickly determine coleoptile lengths are vital for breeding studies. Traditionally, direct selection for root and coleoptile traits has been limited by the lack of suitable phenotyping methods, genetic and phenotypic complexity, and poor repeatability in sampling. In this study, we innovated a method utilizing 3D printing technology to measure root angle and coleoptile length in wheat seedlings. We evaluated seedlings from eight different wheat genotypes across varying temperatures and validated our findings through image processing techniques.ResultsThe analysis of variance in root architecture revealed significant differences among genotypes for root angle. Temperature treatments also significantly influenced shoot length, number of roots and total root length. The Tosunbey genotypes exhibited the highest root angle and the lowest root angle was observed in Altindane genotypes. Additionally, we observed that increasing the temperature led to an increase in seedling root length. Similarly, the coleoptile architecture analysis showed significant differences among genotypes in coleoptile length, leaf length, number of roots, and total root length. Temperature treatments and deep sowing applications significantly affected these traits as well. The Tosunbey and M & uuml;fitbey genotypes exhibited the longest coleoptile length, whereas the Nevzatbey genotype showed the shortest.ConclusionSelecting for a narrow root angle and a high number of seminal roots can result in deeper, more branched root systems. Furthermore, developing wheat genotypes with longer coleoptiles can enhance plant production and early vigor, particularly with deep sowing. Our method, using the eqiupments producing by 3D printing technology enables high-throughput phenotyping of wheat roots and coleoptiles, offering new insights into root and coleoptile system regulation at different temperature conditions. This method can be seamlessly integrated into breeding programs to enhance drought tolerance, rapidly phenotyping populations for root and coleoptile characteristics
Decreasing edema with platysma exercises following third molar extraction surgery: A randomized controlled trial
No full textBackground and purpose: The extraction of lower third molars is a routine procedure in dental practice however, it can lead to complications such as pain, edema and trismus. The aim of this study is to investigate the effects of platysma exercises applied after lower third molar tooth extraction on edema, while observing the differences in pain and trismus.
Materials and methods: This randomized controlled trial was conducted at the Faculty of Dentistry, Ankara University. Thirty-one participants, aged 18-40, requiring impacted lower third molar extraction were randomly assigned to an intervention group following surgery (receiving platysma exercises and pharmacological treatment) or a control group (receiving pharmacological treatment only). Postoperative outcomes, including edema, pain, and trismus, were evaluated at four time points: preoperatively, and on postoperative days 1, 3 and 7. Edema was assessed via standardized facial measurements, pain using a visual analog scale, and trismus by measuring maximum inter-incisal distance.
Results: The intervention group exhibited a significant reduction in edema compared to the control group by the seventh postoperative day (p < 0.05). No significant differences were observed in trismus or pain levels between the groups, although a trend towards lower pain scores was noted in the intervention group.
Conclusion: Platysma exercises effectively reduce postoperative facial edema without exacerbating pain or trismus. This simple, cost-effective approach can be considered a valuable adjunct in the postoperative management of lower third molar extractions msö