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Öğe Mechanical and Tribological Performance of Polypropylene/Tin Powder Composites(Natl Inst Science Communication-Niscair, 2022) Gulesen, Mustafa; Yetgin, Salih Hakan; Unal, HuseyinIn this study, the effect of Tin powder filler content on the mechanical and tribological performance of Tin filled Polypropylene (PP) composites were investigated. Polypropylene composites were prepared in a Brabender kneading chamber. The melt was transferred to a laboratory hot press and compression molded into samples for tests. The mechanical performances of the polymer based composites were determined by tensile and notched izod impact tests. The tribological tests were carried out in dry condition using pin-on-disc at 0.5-1.5 m/s Sliding Speed (SS) and 10-30 N loads. The mechanical test results demonstrated that the incorporation of Tin powders increased the Tensile Strength (TS) (5.6%), tensile modulus (TM) (19.8%) and izod Impact Strength (IS) (41.8%) while decreased the Elongation at Break (EB) (80%) values of Tin powder filled PP composites. The Friction Coefficient (COF) and Specific Wear Rate (SWR) decreased with the increase in filler content. The COF of unfilled PP, PP-8% Tin powder, PP-16% Tin powder and PP-24% Tin powder composites decreased about 20%, 23.4%, 21.8% and 29.3% with the increase in applied load from 10 N to 30 N. The SWR of the Tin powder filled PP composites decreased by 91% compared to unfilled PP polymer at 1.5 m/s speed and 30 N load value.Öğe Novel Schiff Base Sulfonate Derivatives as Carbonic Anhydrase and Acetylcholinesterase Inhibitors: Synthesis, Biological Activity, and Molecular Docking Insights(Wiley-V C H Verlag Gmbh, 2025) Yasar, Umit; Demir, Yeliz; Gonul, Ilyas; Ozaslan, Muhammet Serhat; Celik, Gizem Gumusgoz; Turkes, Cuneyt; Beydemir, SukruSulfonate derivatives are an essential class of compounds with diverse pharmacological applications. This study presents the synthesis and detailed characterization of six novel Schiff base sulfonate derivatives (L1-L6) through spectroscopic techniques (FT-IR and NMR). Their inhibitory potential was evaluated against human carbonic anhydrase isoenzymes (hCA I and hCA II) and acetylcholinesterase (AChE), which are crucial therapeutic targets for diseases such as glaucoma, epilepsy, and Alzheimer's disease. The KI values for the compounds concerning AChE, hCA I, and hCA II enzymes were in the ranges of 106.10 +/- 14.73 to 422.80 +/- 17.64 nM (THA: 159.61 +/- 8.41 nM), 116.90 +/- 24.40 to 268.00 +/- 35.84 nM (AAZ: 439.17 +/- 9.30 nM), and 177.00 +/- 35.03 to 435.20 +/- 75.98 nM (AAZ: 98.28 +/- 1.69 nM), respectively. Molecular docking analyses revealed key interactions within the active sites of the enzymes, including hydrogen bonding with critical residues and pi-pi stacking interactions. Notably, L3 demonstrated superior inhibition against hCA I (KI: 116.90 +/- 24.40 nM) and AChE (KI: 106.10 +/- 14.73 nM), positioning it as a promising lead compound. This comprehensive investigation contributes to the development of isoform-specific inhibitors for therapeutic use and provides valuable insights into their binding mechanisms. The findings underscore the potential of Schiff base sulfonates as scaffolds in drug discovery for neurodegenerative and metabolic disorders.Öğe Onosma rutila (Boraginaceae) Plant Extract: Chemical Composition, Biological Analysis, and Film Forming Potential With Polymers(Wiley-V C H Verlag Gmbh, 2025) Binzet, Riza; Binzet, Gun; Turunc, Ersan; Cevik, Pinar Kuce; Demir, Didem; Arslan, HakanThis study aimed to integrate the ethanolic extract obtained from the aerial parts of endemic Onosma rutila as a new bioactive ingredient into polymeric films and to produce biofunctional composite thin films for use in biomedical applications. Initially, the definition of the plant extract was carried out in terms of chemical composition and biological activities. The main component of the extract was revealed as 9,12-octadecadienoic acid (15.90%). Antimicrobial activity was evaluated against a total of five microorganisms by the well diffusion method and microdilution technique. MIC99 results showed the lowest inhibition against Candida albicans, suggesting a stronger antifungal effect than antibacterial activity. Also, the 2,2-diphenyl-1-picrylhydrazyl scavenging activity of O. rutila, ascorbic acid, and butylated hydroxytoluene at 500 mu g/mL showed values of 87.63, 90.13, and 46.82%, respectively. In the next phase, the extract, which was revealed to be an effective biological agent, was incorporated into the polymer solutions prepared based on chitosan and polyvinyl alcohol at different ratios to produce a series of thin films. For application purposes, the thin films' chemical compositions, water retention capacities, and morphological properties were determined and their potential for use as wound dressing material was evaluated.Öğe ANDClust: An Adaptive Neighborhood Distance-Based Clustering Algorithm to Cluster Varying Density and/or Neck-Typed Datasets(Wiley-V C H Verlag Gmbh, 2024) Senol, AliAlthough density-based clustering algorithms can successfully define clusters in arbitrary shapes, they encounter issues if the dataset has varying densities or neck-typed clusters due to the requirement for precise distance parameters, such as eps parameter of DBSCAN. These approches assume that data density is homogenous, but this is rarely the case in practice. In this study, a new clustering algorithm named ANDClust (Adaptive Neighborhood Distance-based Clustering Algorithm) is propoesed to handle datasets with varying density and/or neck-typed clusters. The algorithm consists of three parts. The first part uses Multivariate Kernel Density Estimation (MulKDE) to find the dataset's peak points, which are the start points for the Minimum Spanning Tree (MST) to construct clusters in the second part. Lastly, an Adaptive Neighborhood Distance (AND) ratio is used to weigh the distance between the data pairs. This method enables this approach to support inter-cluster and intra-cluster density varieties by acting as if the distance parameter differs for each data of the dataset. ANDClust on synthetic and real datasets are tested to reveal its efficiency. The algorithm shows superior clustering quality in a good run-time compared to its competitors. Moreover, ANDClust could effectively define clusters of arbitrary shapes and process high-dimensional, imbalanced datasets may have outliers. This study proposes a new clustering algorithm named ANDClust to handle datasets with varying density and neck-typed clusters. In the proposed algorithm, an Adaptive Neighborhood Distance (AND) ratio is used to weigh the distance between the data pairs as if it differs for each data pair in the dataset. This method makes the approach support not only the varying density among clusters but also the varying density inside the cluster. imageÖğe ImpKmeans: An Improved Version of the KMeans Algorithm, by Determining Optimum Initial Centroids, based on Multivariate Kernel Density Estimation and Kd-Tree(Budapest Tech, 2024) Senol, AliK -means is the best known clustering algorithm, because of its usage simplicity, fast speed and efficiency. However, resultant clusters are influenced by the randomly selected initial centroids. Therefore, many techniques have been implemented to solve the mentioned issue. In this paper, a new version of the k -means clustering algorithm named as ImpKmeans shortly (An Improved Version of K -Means Algorithm by Determining Optimum Initial Centroids Based on Multivariate Kernel Density Estimation and Kd-tree) that uses kernel density estimation, to find the optimum initial centroids, is proposed. Kernel density estimation is used, because it is a nonparametric distribution estimation method, that can identify density regions. To understand the efficiency of the ImpKmeans, we compared it with some state-of-the-art algorithms. According to the experimental studies, the proposed algorithm was better than the compared versions of k -means. While ImpKmeans was the most successful algorithm in 46 tests of 60, the second-best algorithm, was the best on 34 tests. Moreover, experimental results indicated that the ImpKmeans is fast, compared to the selected k -means versions.Öğe THE PROTECTIVE EFFECT OF ALPHA LIPOIC ACID ON RETINAL DAMAGE IN STREPTOZOTOCIN-INDUCED DIABETIC RATS(Parlar Scientific Publications (P S P), 2021) Berkoz, Mehmet; Yildirim, Metin; Bahar, Leyla; Sucu, Nehir; Ilhan, Mert; Yalin, Ali ErdincIn this study, we examined the effects of alpha lipoic acid treatment on streptozotocin (STZ)-induced diabetic rats and investigated the mechanisms underlying the protective action of alpha lipoic acid in diabetic retinal damage which was induced by inflammation and oxidative stress and activation of MAPKs and NF-kappa B signaling pathways. A total of 28 rats were divided into 4 groups: control, diabetes mellitus (45 mg/kg STZ, alpha lipoic acid (100 mg/kg/day, gavage, for 21 days) and diabetes mellitus+ alpha lipoic acid. We measured malondialdehyde, and reduced glutathione levels and superoxide dismutase and catalase activities, vascular endothelial growth factor, nitric oxide and prostaglandin E2 levels, inducible nitric oxide synthase and cyclooxygenase-2 mRNA levels and MAPK/NF-kappa B protein levels in retina tissue. Alpha lipoic acid enhances antioxidant enzyme activities and inhibits NF-kappa B activation and IKB-alpha degradation, phosphorylation of p38. ERK, and JNK proteins, the expression of inducible nitric oxide and cyclooxygenase-2 mRNA, and production of nitric oxide, vascular endothelial growth factor, and prostaglandin E2. These results suggest that the antioxidative and anti-inflammatory activities of alpha lipoic acid may be important mechanisms involved in the protective effect of alpha lipoic acid on diabetic retinal damage in STZ-induced diabetic rats. Furthermore. alpha lipoic acid markedly reduced retinal injury associated with diabetes, as demonstrated by reduced histological damage of retinal cells.Öğe Optical and structural characterization of (Mn, Fe) co-doped lead chalcogenides for optoelectronics applications(Natl Inst Optoelectronics, 2021) Merabet, B.; Ozkendir, O. M.; Hassanien, A. S.; Maleque, M. A.Lead chalcogenides (LCs) exhibit non-stability and lower device efficiency due to smaller bandgap (E-g) leading to poor optical properties for photovoltaic (PV) applications. In this work, optical properties of transition metals (TMs) such as (Mn and Fe) co-doped with LCs especially PbS in the framework of DFT+U (8 eV) and L/APW+/o method are theoretically investigated to predict new optical material for photovoltaic and other optoelectronics applications. The XAFS spectroscopy technique was used to analyze electronic structures and optical properties of (Mn, Fe) co-doped LCs. Midgap states of co-doped PbS reveal to improve the absorption of infrared light mainly due to slight doping with TMs. Compared to pure PbS, Mn doping in PbS induces E-g widening, blue-shift, and improve the light absorption edge. Due to co-doping, the magnetic order is translated that can lead to forming a charge compensated system which is beneficial to minimize vacancies related to defects formation.Öğe MENTAL FATIGUE EXPERIENCES OF RESIDENT PHYSICIANS(Nobel Ilac, 2024) Yilmaz, Necla; Yildiz, Ebru; Kutuk, Hacer Aksoy; Guvenc, Fatmanur; Celik, Omer; Kucuk, Feyza; Parlak, SeymaObjective: This research aims to reveal the mental fatigue experiences of resident physicians while practicing their profession. Material and Method: The study was carried out with the phenomenology design, which is considered within the scope of qualitative research. Participants were reached using the homogeneous sampling technique, which is one of the purposive sampling techniques. In this context, in-depth interviews were conducted using semi -structured forms with 10 resident physicians continuing their residency training in Turkey. The data obtained by transcribing the interviews were subjected to interpretive phenomenological analysis. The data obtained were coded and gathered under themes to make the phenomenon of mental fatigue meaningful. Results: In this study, which examines the mental fatigue experienced by assistant physicians while performing their profession as a whole, it has been determined that the causes of mental fatigue are related to working life, academic life, professional life, psychological, systemic and physiological reasons. At the same time, it has been determined that the mental fatigue experienced by assistant physicians causes some individual consequences such as stress, anxiety, focusing problems, and burnout, and some social consequences such as social adaptation problems, negative effects on the patient, and difficulty in the diagnosis process. Conclusion: This study, which reveals the causes and consequences of mental fatigue experienced by resident physicians, has concluded that this situation not only has individual consequences on the physician but also causes some social consequences such as difficulty in the diagnosis process, social adaptation problem and the negative effects of this situation on the patients. To minimize this effect, it is recommended to clarify the job description of resident physicians, reduce the patient burden by shortening long working hours, and make necessary legal and systemic regulations on the subject.Öğe INVESTIGATING THE IMPACT OF USING MAGNETIC-TYPE NANOFLUID ON THE THERMAL PERFORMANCE OF A SOLAR WATER COLLECTOR WITH HELICALLY COILED TUBE ABSORBER(Begell House Inc, 2024) Aytac, Ipek; Tuncer, Azim Dogus; Variyenli, Halil Ibrahim; Khanlari, Ataollah; Satay, EbruIn recent years, solar water collectors are commonly preferred for supplying heated water to be utilized in various processes. In the present study, a solar water collector equipped with a helically coiled absorbing surface has been manufactured and experimented under various working conditions to determine its general behavior. The main goal of using a helically coiled absorber is enhancing energy harvest in the collector by ensuring vertical angle between the absorbing area and incident radiation. In addition, for providing greater increase in thermal efficiency, magnetic type nanofluid has been used as a working fluid. In this context, NiFe(2)O(4 )nano-sized particles have been mixed with water at the ratio of 2% (wt./wt.). Accordingly, the performance of the collector has been empirically examined using both water and magnetic nanofluid at two different flow rates. The overall results of the present survey exhibited successful use of magnetic type nanofluid in a solar collector equipped with a helically coiled absorbing surface. Utilizing magnetic nanofluid in the collector as circulating fluid raised the thermal efficiency on an average of 20.29% and 23.59% at volumetric flow rates of 0.5 lpm, and 0.9 lpm, respectively. Moreover, utilizing NiFe2O4/water nanofluid in the water collector enhanced the exergy efficiency on an average of 44.53% and 40.04% at volumetric flow rates of 0.5 lpm and 0.9 lpm, respectively.Öğe AN EXPERIMENTAL INVESTIGATION TO PREDICT OPTIMUM CHARGE OF A HEAT PUMP SYSTEM(Begell House Inc, 2023) Afshari, Faraz; Khanlari, Ataollah; Tuncer, Azim Dogus; Soezen, AdnanWorking principles of heat pumps is an important matter from a thermodynamic point of view that has been researched from various aspects. In this study, undercharged, optimum charged, and overcharged conditions of a heat pump were investigated using R134a refrigerant. Variations in temperature, pressure, and the coefficient of performance have been evaluated and it was aimed to find out the optimum charge condition considering different parameters. According to the experimentally obtained findings, the coefficient of performance was increased by more than three times when the refrigerant amount increased from 2000 g to similar to 7300 g. The general outcomes of the present study indicated that optimum refrigerant charge amount can notably affect the performance of heat pump apparatus. It was shown that the P-h diagram of all heat pump systems depends on the working conditions and the refrigerant charge is a very important criterion that can make significant changes in the P-h diagram. It was found that, by increasing refrigerant charge, after the downtrend starts in the compressor inlet temperature, 20% refrigerant can be added to achieve the maximum COP value. Additionally, the critical point in expansion valve outlet temperature was used to find the optimum charge. It was revealed that if 140% refrigerant is added to the given refrigerant at critical point, the optimum COP value can be achieved.Öğe PASSIVE THERMAL MANAGEMENT OF PHOTOVOLTAIC PANEL BY USING PHASE CHANGE MATERIAL-FILLED ALUMINUM CANS: AN EXPERIMENTAL STUDY(Begell House Inc, 2022) Tuncer, Azim Dogus; Khanlari, Ataollah; Aytac, Ipek; Ciftci, Erdem; Sozen, Adnan; Variyenli, Halil IbrahimIn the recent years, researches are focused on improving the efficiency of photovoltaic (PV) panels by cooling panel surface utilizing different methods. In this work, paraffin wax-filled aluminum beverage cans have been utilized to improve the performance of photovoltaic panels. The main aims of this study are reutilizing waste materials in solar systems and increasing the performance of a PV panel by employing an unconventional approach. Modified and unmodified PV panels have been experimentally investigated simultaneously to observe and compare their performances. Experimentally attained outcomes showed that electrical efficiency was upgraded from 70.69% to 72.60%. Moreover, normalized power output efficiency was (round as 61.72% and 71.56%, respectively, for unmodified and modified PV systems. In addition to the electrical performance investigation, an exergy analysis has been performed and mean exergy efficiency values for conventional and modified PV panels were found as 2.26% and 5.73%, respectively. General outcomes of this study showed successful utilization of paraffin wax -filled aluminum cans as a thermal management and efficiency improvement technique in photovoltaic systems.Öğe NUMERICAL INVESTIGATION OF THERMAL PERFORMANCE ENHANCEMENT POTENTIAL OF USING Al2O3-TiO2/WATER HYBRID NANOFLUID IN SHELL AND HELICALLY COILED HEAT EXCHANGERS(Begell House Inc, 2022) Gungor, Alper; Sozen, Adnan; Khanlari, AtaollahShell and helically coiled tube heat exchangers (SHCTHEXs) are a special type of shell-and-tube heat exchangers and they are widely used in industry in many processes. The tubes inside the shell are curved to form a helical coil which has a positive impact on heat transfer. The main purpose of this study is to investigate thermal performance enhancement potential of using a new type of hybrid nanofluid in SHCTHEXs. In this study, two types of SHCTHEXs - one vertically oriented and the other horizontally oriented - have been designed with the same geometrical dimensions. These designs have been simulated with two types of fluid on the shell side: water and Al2O3-TiO2/water hybrid-type nanofluid at various shell-side flow rates in order to reveal the heat transfer improvement potential of using this hybrid nanofluid in SHCTHEXs. The simulations indicated that utilizing Al2O3-TiO2/water hybrid-type nanofluid on the shell side resulted in 7.7% increase in the average heat transfer rate for vertically oriented SHCTHEX and 9% increase for the horizontally oriented SHCTHEX. Calculated heat transfer rate values ranged between 3337 and 5136 W. Among the simulated designs the best performing combination has been horizontally oriented SHCTHEX with Al2O3-TiO2/water hybrid-type nanofluid on the shell side. This combination provided 2.5 degrees C better cooling at the hot fluid outlet compared to poorest performing combination: vertically oriented SHCTHEX with water (both streams at 3 lpm). Using nanofluid increased the overall heat transfer coefficient parameter in horizontally and vertically oriented heat exchangers as 17.2% and 13.7%, respectively. The achieved outcomes of this work indicate that utilizing an Al2O3-TiO2/water hybrid nanofluid provides a notable amount of increase in heat transfer rate. In addition, overall results of the study showed that horizontally oriented SHCTHEX had better performance in comparison with vertically oriented one.Öğe THE RELATIONSHIP BETWEEN COVID-19 PERCEIVED RISK AND ATTITUDES TOWARDS COVID-19 VACCINATION IN HEALTHCARE PROFESSIONALS: AN EXAMPLE OF EASTERN TURKEY(Medicinska Naklada, 2021) Sonmez, Tugce; Yarah, Suheyla; Turan, Gulcan BahceciogluBacground: This study aimed to examine the relationship between COVID-19 perceived risk and attitudes towards COVID-19 vaccination in healthcare professionals. Subjects and methods: This cross-sectional descriptive study included a total of 580 healthcare professionals. Results: The healthcare professionals' COVID-19 Perceived Risk Scale (CPRS) and Attitudes towards COVID-19 Vaccine Scale (ATV-COVID-19) mean scores were 31.3615.16 and 3.0010.61, respectively. A statistically significant negative correlation was found between their CPRS and ATV-COVID-19 mean scores. Conclusions: The healthcare professionals had a high COVID-19 perceived risk and moderately positive attitudes towards COVID-19 vaccine.Öğe SEASONAL ENERGY-EXERGY ANALYSIS OF A NEW FOLDABLE PHOTOVOLTAIC-THERMAL AIR COLLECTOR: AN EXPERIMENTAL AND NUMERICAL STUDY(Begell House Inc, 2022) Tuncer, Azim Dogus; Khanlari, Ataollah; Sozen, AdnanSimultaneous generation of electricity and thermal energy can be done employing photovoltaic-thermal (PVT) systems. A significant issue in access to reliable and continuous energy is the power shortage in some regions in the world and the problems that arise accordingly. In this survey, yearly performance of a novel foldable PVT collector to be used in regions with limited access to energy has been experimentally and numerically investigated. In the first step of this survey, the CFD approach has been utilized to select the most efficient absorber design for the PVT air collector. In the next stage of the work, the PVT collector has been fabricated considering the numerical results and tested at different working condition in various seasons. Both numerical and experimental outcomes of the present work indicated the successful design of the foldable PVT system. The mean thermal ef iciency of the portable PVT collector was attained in the range of 51.11-67.05%. The overall exergetic ef iciency of the PVT system varied between 5.18 and 6.14%.Öğe Thermodynamic analysis of usage of R134a, R1234yf, R450A, R513A and R515B in the mechanical vapor compression refrigeration system(Gazi Univ, Fac Engineering Architecture, 2024) Bilen, Kemal; Isik, Bilal; Dagidir, Kayhan; Arcaklioglu, ErolR134a, which is used as a working fluid in Vapor Compression Refrigeration Systems (VCRS), is one of the refrigerants that is planned to be discontinued the usage due to the global warming. For this reason, researchers have tended to developing alternatives to R134a. In this context, in this study, the usage of R134a and its alternatives R1234yf, R450A, R513A, and R515B refrigerants were theoretically examined with the help of a theoretical model developed in the Engineering Equation Solver (EES) program using experimental data in terms of first and second laws of thermodynamics in a mechanical vapor compression refrigeration system. Analyses were performed for constant cooling capacity at various evaporation and condensation temperatures. In this study, the effects of the refrigerant type on the compressor power, heat rejection rate from the condenser, Coefficient of Performance (COP), second law efficiency, and mass flow rate of the refrigerant were determined. In addition, the results obtained under the same conditions for R134a and its alternatives were compared. As a result, compressor power increased by 5.62% for R1234yf, 2.35% for R450A, 3.41% for R513A, and 2.88% for R515B compared to R134a. Thus, it was observed that COP decreased by 5.32% for R1234yf, 2.30% for R450A, 3.30% for R513A, and 2.80% for R515B compared to R134a. Similarly, it was observed that the second law efficiency decreased by 5.32% in case of the usage of R1234yf, 2.30% in case of the usage of R450A, 3.29% in case of the usage of R513A, and 2.80% in case of the usage of R515B compared to R134a. Hence, it has been determined that the closest refrigerant to R134a in terms of the COP and the second law efficiency is R450A.Öğe Celebrity Endorsement on Gender-Based Conspicuous Consumption(Gadjah Mada Univ, Master Management Program, Fac Economics & Business, 2025) Tor-Kadioglu, Cansu; Bozyigit, SezenThis study explores the irrational aspects of consumer behavior, focusing on conspicuous consumption driven by the pursuit of status and self-expression. It examines how consumers emulate celebrities based on key dimensions of celebrity endorsement- attractiveness, expertise, and credibility-and how these factors vary between genders. The research presents a conceptual framework that integrates conspicuous consumption with celebrity endorsement dimensions, supported by an extensive literature review. Data were collected from 403 participants belonging to the Y and Z generations through online surveys and analyzed using SPSS and AMOS software. The results reveal gender-specific differences in the influence of celebrity endorsement dimensions on conspicuous consumption. For female consumers, celebrity attractiveness and credibility significantly enhance conspicuous consumption, whereas expertise has a mitigating effect. In contrast, male consumers are primarily influenced by celebrity attractiveness. The study concludes that the allure of celebrities, as reflected in their attractiveness and credibility, promotes conspicuous consumption, while their expertise can diminish it. These findings provide valuable insights for businesses leveraging celebrity endorsements, particularly in gender-targeted marketing strategies, highlighting the importance of tailoring approaches based on consumer gender to maximize impact.Öğe Experimental Evaluation of Installation Cleaning in terms of Energy Efficiency in Individual Heating Systems -2(Gazi Univ, 2022) Yuruk, Muhammet; Variyenli, Halil Ibrahim; Martin, Kerim; Khanlari, Ataollah; Aytac, IpekVarious problems and pollution occur in heating systems over time, especially calcification. This contamination prevents the radiators from dissipating heat, causing the system to operate inefficiently and consume energy. In this study, an experimental research was carried out on the energy efficiency of installation cleaning. In the study, these two situations were compared with the measurements and calculations made before and after the installation cleaning. It has been observed that the cleaning of the installation homogenizes the temperature distribution in the radiator. As a result of the cleaning, an increase of approximately 5 degrees C was obtained in the radiator temperatures. In addition, while a 21.16% reduction was achieved in natural gas consumption, a 17.2% improvement was achieved in the convection heat transfer mechanism in the radiators. In addition, depending on the amount of natural gas used, reductions in the amount of harmful gases (NO, NOx, CO, CO2 and O-2) released to the environment have been achieved, varying between 3.2% and 25%.Öğe The Effect of Product Photograph and Information on Digital Apparel Marketing(Pacific Inst Management, 2021) Ozbek, Ahmet; Tor-Kadoglu, Cansu; Haque, AhasanulThe aim of this study is to reveal whether consumers are affected by product information and product photographs while purchasing pants from digital channels. The study consists of two stages. In the first stage, an online survey that evaluated the effect of the purchase behavior of pants pants photographs and information, was performed on 651 young consumers in Turkey. According to SPSS analysis, important results were obtained for the difference in the demographic factors of the consumers and the criteria that affect the purchasing of the consumer are determined. In addition, it was concluded that information about the size of the trousers, fabric content, coloring, waist size, slackness, suitability for the use of wide-calfed consumers are also the criteria related to apparel information that affect the purchasing decision of the consumer. In the second stage of the research, three websites were scanned. The photos and information of the pants in the e-market places that consumers prefer most when purchasing apparels were examined according to the criteria determined in the first stage of the research. As a result of the examination, it was concluded that the pants photos and pants information in the relevant e-marketplaces did not meet some criteria that young consumers attach importance to. As a result of this research, which supports quantitative analysis with visual evidence, valuable advice has been given to the digital marketing sector.Öğe COMPARISON OF THE FEAR LEVELS AND SLEEP PROBLEMS OF NURSES WORKING IN WARDS WHERE PATIENTS WITH AND WITHOUT COVID-19 ARE HOSPITALIZED: A STUDY FROM TURKEY(Medicinska Naklada, 2021) Celik, Asli Sis; Sonmez, TugceBackground: This study was carried out to compare the fear levels and sleep problems of nurses working in wards where patients with COVID-19 are hospitalized and nurses working in wards without COVID-19 patients. Subjects and methods: This descriptive, cross-sectional research was conducted on 211 nurses using a web-based online survey in Turkey (including 104 nurses working in wards where patients with COVID-19/107 nurses working in wards where patients without COVID-19). Results: When the COVID-19 Fear Scale mean scores of the nurses working in wards where patients with/without COVID-19 were compared, it was determined that the difference between the groups was statistically significant (p<0.05). When the sleep problems experienced were compared according to the Post-Sleep Inventory, it was determined that the difference between the groups was not statistically significant (p>0.05). There was a moderately significant and positive correlation between the nurses' mean scores for the COVID-19 Fear Scale and Post-Sleep Inventory. Conclusions: It was determined that as the fear levels of nurses increased, they experienced more sleep problems.Öğe Handling Quality-Oriented Tuning Procedure of a Dynamic Inversion Control Law via a Robust Control Technique(Amer Inst Aeronautics & Astronautics, 2024) Resit, Demirkiran; Hasan, Isci; Ercument, TurkogluThe robustness of a flight control law has played an important role. Designers can achieve this objective by using different techniques; however, if the target platform has a wide range of the flight envelope and desired behavior is demanding (e.g., fighter aircraft), completing a robust design becomes a challenging task while requested high performance capability. Using both the dynamic inversion philosophy and robust control design methodology can be a good choice in terms of meeting the essential requirements of flight control law design. Enhancing the handling qualities while not losing robustness is a common trade-off in the classic a flight control law development process. In order to improve the handling quality, tuning the feed-forward term instead of feedback terms is a valuable approach to preserve the robustness of the closed loops. Tuning procedure according to the proposed idea is explained in detail throughout the paper. The control design steps and the results of comprehensive set of stability, robustness and handling qualities by considering the proposed flight control law with additional terms are addressed. Besides, the achieved entire results indicate that the requirements of stability, handling qualities, and robustness is met by offered control law development strategies.
