Mühendislik, Mimarlık ve Tasarım Fakültesi
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Browsing Mühendislik, Mimarlık ve Tasarım Fakültesi by WoS Q Quality "Q2"
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- ItemA comprehensive analysis of apricot drying methods via multi-criteria decision making techniques(Wiley, 2024-10) Abdulvahitoğlu, Aslı; Abdulvahitoğlu, Adnan; Cengiz, Nurten; 382420Food and food safety have been among the most important issues for people throughout history. Societies have always tried to be self-sufficient in food and have avoided becoming dependent on foreign sources. However, the fact that most foods are seasonal and the increasing population's food consumption have revealed the need to preserve foodstuffs for a long time. The old and well-known method used today for extending shelf life is the drying process. The drying process is preferred over other preservation methods for reasons such as being more economical, easier to transport, having a longer shelf life, more concentrated nutritional value, and containing fewer additives. This ensures that dried foods are of higher quality in terms of physical, chemical, microbial properties, and nutritional values compared to other packaged foods. While the drying process was traditionally done over a long period, technological advancements have led to the production of higher quality and more valuable commercial products in a shorter time. In this study, traditional and technological methods used in drying apricots were compared according to the parameters determined by experts in the field. Since multiple parameters are effective in the comparison, Multi-Criteria Decision Making (MCDM) techniques were used. The optimum apricot drying method was determined by combining the results obtained from different MCDM techniques with the Borda rule.
- ItemA theoretical and experimental investigation using a multi-criteria decision-making approach to investigate the use of oak cupule biomass as a sustainable corrosion inhibitor for mild steel in acidic solution(Elsevier, 2025-08) Şişmanoğlu, Sedef; Mert, Mehmet Erman; Doğru Mert, Başak; Abdulvahitoğlu, Adnan; 382420This study investigates adsorption mechanism and inhibition efficiency of oak cupule (OC) biomass on mild steel (MS) corrosion in an acidic medium through quantum chemical calculations and electrochemical analysis. The chemical composition of OC was characterized using FTIR-ATR, mass spectrometry, and UV–Vis spectroscopy. Electrochemical impedance spectroscopy was conducted at varying inhibitor concentrations, complemented by surface morphology analysis via SEM and contact angle measurements after 168 h of immersion. At 250 ppm, the inhibition efficiency reached 92.5 %, attributed to the presence of tannins and polyphenolic compounds. Adsorption followed the Langmuir isotherm, with an equilibrium constant of 2.36 L mg−1 and a Gibbs free energy change of −12.08 kJ mol−1. Contact angle measurements indicated increased hydrophobicity due to the formation of protective layer. Potential of zero charge (PZC) analysis confirmed electrostatic interactions between OC molecules and the positively charged MS surface in 0.5 M HCl. Molecular insights were obtained using Density Functional Theory (DFT) with the B3LYP/6–311++G(d,p) method, revealing electronic properties such as frontier molecular orbital energies, energy gap and atomic charges. The optimum result was determined by analyzing the experimental findings at different inhibitor concentrations and different durations using Multi Criteria Decision Making (MCDM) methods. It was found that scenario S5 provided the optimum result.
- ItemComparative Analysis of Different Drying Methods on Strawberry Aroma Compounds via Multi-Criteria Decision-Making Techniques(MDPI, 2025-06) Cengiz, Nurten; Abdulvahitoğlu, Aslı; Abdulvahitoğlu, Adnan; 382420Food and food safety, as one of the basic issues of human life, has made it necessary to store foods for a long time with the increasing population. One of the oldest and most common methods of extending the shelf life of food products is the drying process. The drying process contributes to the higher quality of foods in terms of physical, chemical, and microbial properties by ensuring that beneficial contents such as vitamins, minerals, and aroma compounds are better preserved. The aroma values of foods, which consist of taste and smell components, gain importance. In foods, the taste is determined by permanent components, while smell is determined by volatile components. The loss of volatile aroma compounds in the strawberry drying process negatively affects product quality. Small changes in aroma compounds can lead to significant differences in product taste. Therefore, strawberry aroma is a critical factor for consumer appeal and commercial success. In this study, the effects of drying methods on the aroma compounds of strawberry fruit were compared with Multi Criteria Decision Making (MCDM) techniques. In this study, PSI-based MCDM techniques were used to make the most appropriate choice among strawberry drying methods. The values of 23 distinct aroma compounds obtained with different drying methods applied to strawberry fruit were analyzed with 7 different MCDM techniques. The calculations gave similar results and these results were combined with the Borda rule. Accordingly, the drying methods with the highest scores were determined as freeze drying.
- ItemEnhanced EMI shielding of Ag–polymer composites via TiB2 reinforcement in the 2–4 GHz range(Springer, 2026-02) Demirtaş, Tugay; Atıcı, Şeyma; Aydemir, Umut; Yiğit, Enes; 392813Due to its exceptional electrical conductivity, high thermal stability, and mechanical hardness, titanium diboride (TiB2) has emerged as a critical reinforcement material for high performance electromagnetic interference (EMI) shielding. Despite its potential, achieving a synergistic balance between filler dispersion and high shielding efficiency within polymer matrices remains a significant challenge in current research. This study investigates the performance of composite coatings reinforced with TiB2, a conductive ceramic material, for EMI shielding applications in the 2-4 GHz frequency range. TiB2 is incorporated into a commercially available Ag polymer at various weight ratios (10-50 wt%), and the resulting composites are evaluated using a Vector Network Analyzer. The reflection (S-1(1)) and transmission (S-2(1)) parameters are measured to calculate the total shielding effectiveness, which reached a peak of approximately 45 dB at 2.2 GHz. These findings highlight the promise of TiB2-filled composites as effective EMI shielding materials for use in aerospace, defense, and healthcare applications. Future research will aim to optimize the filler composition and assess material stability under elevated temperatures.
- ItemPareto‑optimal workforce scheduling with worker skills and preferences(Springer, 2025-02) İşeri, Ali; Güner, Hatice; Güner, Ali Rıza; 135066This paper addresses employee scheduling in service operations, considering various skill and skill levels and the fuctuating customer demand throughout the day and week. Employee shift and day-of preferences are also considered to enhance morale. We propose a two-stage integer programming model. In the frst stage, the model optimizes the number of employees required for each shift period, ensuring uniform distribution of overstafng to improve customer service. A Pareto frontier approach is applied between the two stages, ofering decision-makers a set of nondominated solutions that balance overstafng and understafng. The second stage uses the selected Pareto-optimal solution to assign shifts and day-ofs to employees, incorporating their skills, preferences, and fairness considerations. Our model implicitly includes shifts and breaks, reducing decision variables and computational time. Using real data from a dining restaurant chain, we validate the model’s efectiveness in enhancing customer service and reducing labor costs by 12.3% compared to manual scheduling. Furthermore, productivity and employee satisfaction improve by considering individual skills and preferences.
- ItemPsychological impact of disaster relief operations: a study following consecutive earthquakes in Turkey(Cambridge University Press, 2024-05) İşeri, Ali; Baltacı, Recep; 135066Objective: This cross-sectional study investigates the immediate psychological effects of disaster relief operations on team members following 2 consecutive major earthquakes in Turkey. Methods: A total of 170 participants, including professional firefighters, search and rescue (SAR) workers, and volunteers, were surveyed approximately 1 month after the conclusion of active SAR operations. The study utilizes the DSM-V criteria and the Posttraumatic Stress Disorder Checklist (PCL-5) to assess symptoms of post-traumatic stress disorder (PTSD) among participants. Results: The findings reveal a point prevalence of 35.3% for probable PTSD, highlighting the substantial psychological impact on disaster relief teams. Factors such as age, residency in affected areas, and active SAR involvement significantly influenced probable PTSD rates. Interestingly, actively engaged SAR members had lower probable PTSD rates, possibly due to their training. Those who directly witnessed the earthquakes had higher scores, highlighting the impact of firsthand exposure. Additionally, individuals aged 50 and above displayed a higher mean total severity score compared to younger participants. Conclusions: This research contributes to understanding the mental well-being of disaster relief professionals. The study’s findings underscore the importance of timely mental health support and training for these responders, emphasizing the need for preparedness in disaster relief teams.
