Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Bayraktar, Bülent(11)
- Kadakal, Mahir(10)
- Kutlu, Naciye(10)
- Can, Zehra(8)
- Dertli, Enes(8)
- Kırbaş, Zila Özlem(8)
- Teber, Ahmet(8)
- Ayata, Ümit(7)
- Durmuş, İbrahim(7)
- Kadakal, Huriye(7)
- Kirbaş, Zila Özlem(7)
- Özdemir, Akın(7)
- Apak, Ömer Ceyhun(6)
- Banaz, Emrullah(6)
- Bayram, Nesrin Ecem(6)
- Bayram, Sinan(6)
- Demir, Mustafa(6)
- Esmer, Yusuf(6)
- Gercek, Yusuf Can(6)
- Akeren, Zahide(5)
- Battal, Fetullah(5)
- Ekincioğlu, Yavuz(5)
- Ergün, Mustafa(5)
- Gıdık, Betül(5)
- Kara, Yakup(5)
- Maden, Sedat(5)
- Şahin, Engin(5)
- Akeren, İhsan(4)
- Aras, Zakir(4)
- Ayazoglu, Rabil(4)
- Cengiz, Ekrem(4)
- Cuce, Erdem(4)
- Cuce, Pinar Mert(4)
- Ecem Bayram, Nesrin(4)
- Erkılıç, Tugçe Orkun(4)
- Filiz, Tunahan(4)
- Kamiloğlu, Aybike(4)
- Karaali, Rabi(4)
- Kırkıncı, Seran(4)
- Semerci, Vahide(4)
Yayınlar
- MakaleAçık Erişim2024Scopus SJRQ3Antioxidant Activities of Different Peanut (Arachis hypogaea L.) Market Types by Spectrophotometric Techniques Combined with Chemometrics
Gıdık, Betül; Can, Zehra; Önemli, Fadul
Peanut is rich in oil and protein and has a large content of bioactive constituents consisting of tocopherols, phytosterols, and so on. Generally, Virginia, Spanish, Valencia and Runner market types are grown of peanut. In this study, it is aimed to determine the antioxidant activity, total phenolic content and total flavonoid content of peanuts from four different market types, for the first time, and group them with principal component analysis (PCA) and hierarchical cluster analysis (HCA). For PCA, PC1 and PC2 explained 87.655 % of the total variation and, according to the HCA of peanut samples, two main groups were determined. The total phenolic content changed 1.556 to 2.899 mg GAE/g. The lowest value have seen at Spanish merket type to determine the antioxidant activities of peanut samples were maked FRAP and DPPH assay, the lowest FRAP value (8.136 μmol FeSO47H2O/g sample) was seen at Valencia market type, the highest (14.004 μmol FeSO47H2O/g sample) was seen at Virginia market type. It was determined that the total flavonoid, total phenolic content, and antioxidant activities of the Virginia, Valencia, Spanish, and Runner market types included in the study were different from each other, and the Virginia market type showed superior characteristics compared to the others. The results obtained suggest that Virginia market type may be preferred more especially in peanut cultivation for food uses. It is thought that this study can be a source for future studies by eliminating a deficiency in the literature.
AtıfScopus2WoS2OpenAlex2
İncele - Kitap BölümüAçık Erişim2024Smart and Sustainable Energy Systems
Guclu, Tamer; Cuce, Pinar Mert; Cuce, Erdem
Today, fossil fuels still have a more important share in energy production. Reducing the share of these resources in energy production is an extremely important issue in order to prevent the environmental effects caused by greenhouse gas emissions. Especially in the last ten years, the transformation into smart and sustainable energy systems has accelerated in order to use energy resources efficiently and to reduce greenhouse gas emissions. Smart energy systems are systems that allow the use of renewable energy sources such as solar, wind, and geothermal instead of a fossil fuel-based large production system. Thanks to these systems, instead of a single large power generation facility, energies produced from renewable sources close to the area of use can be integrated into the system, thus reducing greenhouse gas emissions. In addition, smart energy systems are effective in reducing energy costs, as they make final consumers a part of energy production. In addition, since smart energy systems allow the integration of sectors such as electricity, heating, energy, transportation, and transmission, they provide a sustainable, accessible, economical, clean, and efficient energy supply. In this study, information about smart and sustainable energy systems has been given, advantages and difficulties have been mentioned, and also an economic evaluation has been made.
AtıfScopus2OpenAlex2İncele - Kitap BölümüYalnız künye2024Assessment, evaluation, and feedback in online education with artificial intelligence-supported tools
Kayali, Bünyami; Balat, Şener
The increasing role of Artificial Intelligence (AI) applications in educational activities is also evident in online education. By providing personalised and adaptive learning experiences and offering support for teachers by tracking student behaviours to make inferences about student success and performance, AI reduces teachers' workload, allowing them to focus more on educational activities. AI applications especially enable the rapid and easy completion of assessment and evaluation activities, which teachers often spend significant time and effort on. Within this scope, AI-supported tools are used in online education activities to perform automatic assessments, provide real-time feedback, and conduct data analysis and performance evaluation activities. In this context, the aim of the study is determined as the examination of measurement, evaluation, and feedback activities in online education with AI-supported tools.
AtıfScopus9OpenAlex8İncele - MakaleAçık Erişim2024Scopus SJRQ1AC transport loss analysis of HTS stack busbars for all-electric aircraft with harmonics and DC offset considerations
Abdioglu, Murat; Gautam, Gaurav; Zhang, Min; Yuan, Weijia
This paper presents a study of the current carrying capacity and AC loss of high-temperature superconducting (HTS) stacks to be used in busbar applications for all-electric aircraft. A 2D model was developed using COMSOL Multiphysics with a T-A formulation for detailed analysis. The study began by applying a stable 20 kA DC offset current to the HTS stacks to simulate practical operating conditions. Firstly, the behaviour of the critical current was studied under self-field conditions for stacks with different numbers of HTS tapes and spacing. Secondly, AC ripple currents were introduced with DC offsets, and the effects of 3rd and 5th harmonic distortions (HD) were studied. The results show that configurations with 40 tapes and gaps of more than 2 mm are considered suitable for safe current transport under DC conditions. On the other hand, increasing the tape spacing leads to an increase in the safe transport current ripple due to the reduced magnetic field interaction within the stack. In addition, the transport loss decreases as the air gap increases due to the reduction in the self-field, whereas it increases as the number of strips increases. The influence of the 3rd HD on the transport loss is minimal at a ripple current of 1% and slightly noticeable at 2%. However, it becomes more obvious as the ripple current approaches the critical value. Remarkably, even cases with equivalent total HD show significantly higher transport losses when characterised by higher 5th HD than their counterparts with 3rd HD. This comprehensive analysis provides valuable information on the performance characteristics of HTS stacks in all-electric aircraft busbar applications and offers important insights for the development and optimisation of these systems in practical aerospace applications.
AtıfScopus1WoS1OpenAlex1İncele - MakaleYalnız künye2024Scopus SJRQ2Analyzing of continuous and discontinuous contact problems of a functionally graded layer: theory of elasticity and finite element method
Yaylacı, Murat; Öner, Erdal; Adıyaman, Gökhan; Öztürk, Şevval; Uzun Yaylacı, Ecren; Birinci, Ahmet
Contact mechanics analysis is crucial because such problems often arise in engineering practice. When examining contact mechanics, the material property of the contacting components is a crucially significant aspect. It is more complex to solve the contact mechanics of systems that are composed of materials that do not have a homogenous structure compared to materials that have homogeneous qualities throughout. While many studies on contact problems with homogeneous materials exist, those involving non-homogeneous materials are scarce in the literature. As material technology improves fast, there will be a greater need to solve such problems. In this respect, analytical and finite element method (FEM) solutions of the continuous and discontinuous contact problems of a functionally graded (FG) layer are carried out in this article. The FG layer in the problem rests on a rigid foundation and is pressed with a rigid punch. From the solutions, the contact length, contact stress, initial separation distance, and beginning and ending points of separation were determined, and the results were compared. It has been concluded that the FEM findings are consistent with the analytical results to a satisfactory degree. This study analyzes contact problem using different approaches and accounts for the influence of body force in a contact geometry that has yet to be reported.
AtıfScopus79WoS83OpenAlex68İncele - MakaleAçık Erişim2024Scopus SJRQ3Investigation of the Effects of a Self-Heated Vest on Vital Values of Individuals: A Case Study on Public Health
Öztekin, Erman Kadir; Demirci, Emre
With the adaptation of portable and harmless technological devices to clothing products, self-heating outdoor products are becoming more common in the market. These products can produce heat energy on their own, unlike standard thermally insulated products. In this way, it contributes to the thermal comfort of people in situations where the environment cannot be conditioned. In this study, the effects of these products, which are in close contact with the human body, on human health were measured through vital values. Measurements were collected from the same group of individuals at three different time intervals over 30 minutes. Significant differences between the obtained data were examined using the Friedman test and detailed using Wilcoxon Signed Rank test. While a significant difference was observed in systolic blood pressure, diastolic blood pressure and body temperature data, no significant difference was found in oxygen saturation and pulse data. As for the actual changes, no serious effects on human health were observed based on the vital values presented in the study.
- Kitap BölümüAçık Erişim2024Pollen Morphology and Anatomy with Botanical Preferences Made by Bees: An Introduction Data
Canlı, Deniz; Bayram, Nesrin Ecem
Pollen is a microspore containing vegetative and generative cells prepared for pollination in seed plants. Because pollen grains show highly variable characteristics, these structures are used to evaluate kinship relationships and similarity levels in plants. However, plant sources of honey, which is consumed as an important food source and functional food, can also be determined by identifying the pollen grains included in the honey by bees. In this study, the characteristic parameters used for the identification of pollen grains in plants and the plant sources frequently visited by bees were mentioned. As a result, variables such as size, polarity and symmetry, shape, exine sculpturing, intine properties and apertures are the main characteristics used to describe pollen grains. Considering these variables, it can contribute to the identification of plant taxa. In addition, the plants that honey bees visit to collect nectar and the botanical origin/source of honey (monofloral-multifloral) can also be determined by identifying the pollen grains included in the honey.
AtıfScopus5OpenAlex4İncele - MakaleAçık Erişim2024Scopus SJRQ1The effect of AI-powered chatbots in social studies education
Yeti̇şensoy, Okan; Karaduman, Hıdır
The aim of this research is to investigate the educational potential of AI-powered chatbots in Social Studies learning-teaching processes. The study was conducted using embedded design, evaluated within the framework of mixed methods research. The study group consists of 78 6th-grade students studying in three different classes, along with one teacher who implemented the practices and guided the process. During the experimental phase of the study, lessons in the experimental group were taught by the practitioner teacher using an AI-powered chatbot named “SosyalciBot”. Meanwhile, lessons in two control groups were taught following the constructivist approach. At the end of the process, it was determined that the experimental group students’ post-test and permanency test scores were significantly higher than the control group students’ scores in both post-test and permanency test. In the semi-structured interviews, both students and the practitioner teacher provided positive evaluations of the pedagogical and design features of the chatbot, indicating that these features positively impacted the learning-teaching process. They also identified some shortcomings while offering suggestions for improvement. Based on the study findings, it is evident that chatbots have a high potential to contribute to Social Studies education. However, to fully harness this potential and achieve optimal effectiveness, further advancements and refinements in chatbot technology are required. At this point, it is recommended to conduct theoretical or applied studies focusing on developing chatbots with high communication capacity and explore innovative and constructive ideas regarding the integration of chatbots into educational environments.
AtıfScopus58WoS37İncele - MakaleYalnız künye2024Scopus SJRQ2Validity and Reliability of the Turkish Version of the Death Literacy Index
Semerci, Vahide; Sönmez Sari, Ebru; Seven, Ahmet
Death literacy is defined as a set of knowledge and skills that make it possible to gain access to, understand, and act upon end-of-life and death care options. This study was conducted to test the validity and reliability of the 29-item original version of the Death Literacy Index (DLI) in Turkish society. The scale was applied on a sample of 436 Turkish adults determined using the snowball sampling method. Explanatory and confirmatory factor analyses were performed. The scale consisted of 6 subscales. The test-retest analysis of this study showed a strong and highly significant positive correlation between overall DLI (.98) and its subscales (.73–.98). The total Cronbach’s alpha reliability coefficient of DLI was found to be.90. It was observed that the Turkish version of DLI was a valid and reliable tool and suitable for use in Turkish society.
AtıfScopus22WoS25OpenAlex29İncele - MakaleAçık Erişim2024Scopus SJRQ3Global attractors in a two-species chemotaxis system with two chemicals and variable logistic sources
Ayazoglu, Rabil; Salmanova, Kamala A.
This paper deals with the higher dimension quasilinear parabolic-parabolic chemotaxis model involving a source term of logistic type (formula presented), subject to the homogeneous Neumann boundary conditions in a Ω ⊂ RN (N ≥ 1) with smooth boundary. It is shown that for the attractionrepulsion case with χ2 ≤ 0, the global boundedness of solutions can be ensured by µ1, µ2 > 0 without any other assumptions, due to the contribution of the logistic sources included in addition to the repulsion mechanism. While for the attraction-attraction case with χ2 > 0, the global boundedness of solutions has to require logistic coefficients µ1, µ2 > 0 such that µ2 properly large.
AtıfScopus4OpenAlex4İncele - MakaleAçık Erişim2024Scopus SJRQ1Pollution Source and Soil Quality Assessments of Heavily Contaminated Soils by Selected Potentially Toxic Elements in a Human-Degraded Wetland Area
Kurt, Mehmet Ali; Yalçın, Sezen; Güler, Cüneyt; Güven, Onur; Yıldırım, Ümit
Wetlands are transitional between terrestrial and aquatic environments and have essential ecological functions. Unfortunately, due to anthropogenic activities and climate change, the area covered by wetlands is gradually decreasing worldwide, causing deterioration and loss of their critical and vital ecological functions. One of these degraded wetlands is the Hürmetçi Sazlığı, a nationally important wetland located in the Kayseri Province of Turkey. This study aims to determine the spatial and vertical (depth profile) distribution and the sources of the potentially toxic elements (PTEs) As, Cd, Pb, and Zn in the soils around the Hürmetçi Sazlığı Wetland (HSW) and to evaluate environmental risk factors using various soil quality indicators. According to the results obtained, it was determined that some parts of the wetland soils were significantly polluted in terms of As, Cd, Pb, and Zn. The concentrations (in mg/kg) of these PTEs in the soil around the wetland ranged between 9.12 and 273.9 for As, 0.38 and 1119.46 for Cd, 3.59 and 1807.66 for Pb, and 41.68 and 77,287.5 for Zn. Several soil quality indicators, including the Enrichment Factor (EF), Contamination Factor (CF), Ecological Risk Index (ERI), and Potential Ecological Risk Index (RI), were calculated to determine the quality and pollution levels of the collected soil samples. According to the calculated RI values, 70 out of 77 sites sampled in the area around the HSW are in the “High Risk” class in terms of all studied PTEs. The soil profile samples indicated that the topsoil (0–50 cm) was heavily contaminated by all PTEs, particularly near a zinc processing plant established in 1976. In addition, parts of the wetland further away from the Zn processing plant were also affected by arsenic pollution from geogenic sources, which can be associated with Plio-Quaternary volcanic activity in the region.
AtıfScopus3WoS3OpenAlex3İncele - Kitap BölümüAçık Erişim2024Which tourist type cares more about environmental sustainability? a quantitative research
Apak, Ömer Ceyhun
This research aims to reveal the impact of tourist types (explorer, adventurer, organized mass, and drifter) on environmental sustainability. In addition, the primary objective of the research is to determine which type of tourist cares about environmental sustainability and at what level. The research was designed according to the relational screening model, one of the quantitative research approaches. The study sample consists of 491 domestic tourists who stayed in a hotel in Turkiye last year. Data were collected using tourist types and environmental sustainability scales. The study found a moderate and significant relationship between explorer, adventurer, organized mass, and drifter tourist types and environmental sustainability. Considering the relative importance levels of the variables used in the study within the scope of hierarchical regression analysis, it was determined that adventurer, explorer, drifter, and organized mass tourist types were significant predictors of environmental sustainability, respectively.
- MakaleAçık Erişim2024The effects of carbonate and vinegar mixture on selected surface properties of iatandza (Albizia ferruginea) wood; [Iatandza (Albizia ferruginea) odununda seçilmiş bazı yüzey özellikleri üzerine karbonat ve sirke karışımının etkileri]
Ayata, Ümit
The color of wooden materials can be altered through various applications (thermal treatment, bleaching, impregnation, aging, etc.). This study aimed to investigate alterations in color, whiteness index (WI*), and glossiness properties resulting from the application of two distinct solutions (two different types of vinegar and a mixture of carbonate) on the surfaces of iatandza (Albizia ferruginea) wood. A reference group was established, and the surfaces subjected to treatments were compared among themselves. According to the results of the analysis of variance conducted, the solution type prepared over all tests was determined to be statistically significant. The L*, C*, b*, and a* values in the color parameters decreased while the h° value exhibited an increase after the application of solutions. The ∆E* values were measured at 13.63 for the carbonate + vinegar (A) solution and 13.13 for the carbonate + vinegar (B) solution. Furthermore, the calculated differences ∆b*, ∆L*, ∆a*, and ∆C* using color formulas were observed to be negative for both solutions. Glossiness values exhibited reductions in both directions at 60 and 85 degrees, alongside decreases in WI* values in both orientations. It was noted that the application of solutions resulted in alterations to the surface characteristics of the wooden material.
AtıfScopus2OpenAlex4TR Dizin1
İncele - MakaleYalnız künye2024Scopus SJRQ1Dynamic Angular Velocity Load-Based Energy Harvesting Analysis for Different Blade Angles and Polarization Directions of Smart Blades
Uyar, M.
Energy consumption and control of electrical devices in flying electric vehicles with propellers such as drones are important for the continuity of the movement process. With this motivation, the piezoelectric energy harvesting performances of the smart drone propeller and smart wind blades are evaluated in order to obtain electrical energy from lead zirconate titanate (PZT) material placed on the propellers. Initially, the effect of smart wind blades with different blade angles on energy harvesting analysis is examined. The energy harvesting performances of the converse (z polarization) and shearing movements (y polarization) of the PZT material placed on the wind blades are compared under different angular rotational velocities. Then, the power outputs obtained depending on the sensor responses of the smart drone propeller with different resistance gains are evaluated according to the polarization directions. The maximum and minimum power output values obtained from the smart drone propeller at 12,000 rpm rotation velocity are measured as about 0.086 and 0.008 W, respectively. The results show that the energy harvesting performance of the z-polarized smart propeller is more effective than the y polarization, and the amount of energy obtained with the increase in the endpoint vibration amplitudes increases as the rotation speed increases.
AtıfScopus1WoS1OpenAlex1İncele - MakaleYalnız künye2024Scopus SJRQ2Effect of sesame protein/PVA nanofibers on oil separation and rheological properties in sesame paste
Yuzer, Mustafa Onur; Genccelep, Huseyin
This study aimed to prevent or minimize the oil phase separation that occurs during storage (0-90 days) of sesame paste at room temperature. In order to determine the changes during storage in the sesame paste samples, the zeta potential, rheological properties, and the separated oil ratio were determined. Significant (p < 0.01) effects of applied storage time and additives on the amount of oil separated in sesame pastes were determined. The oil separated in sesame paste samples varied between 3.83% and 16.29%. While the rate of separated oil increased three times in the control group over time, it showed an insignificant (p > 0.05) increase especially in the samples where 2% nanofiber was added. It was determined that the separation of the oil phase from the structure could be prevented up to 24.73% with the addition of SPI and up to 63.02% with addition of SPINL (nanofiber containing protein isolate) compared to the control. Practical applications: During storage, the particles in the sesame paste tend to precipitate, causing oil separation and residue cake, thus negatively affecting the acceptability of consumers. Additives were added in order to prevent or minimize oil phase separation, which occurs in sesame paste stored at room temperature and is not desired by consumers. As additives, nanofibers containing sesame proteins produced by the electrospinning method and sesame protein isolates (SPIs) were added. Added additives acted by preventing the separation of the oil phase from the structure. It has been determined that the addition of SPI to sesame pastes does not completely prevent the problem of oil separation in sesame paste, but is effective in delaying and reducing it. Since the oil decomposition can be reduced, the amount of oil separated and therefore the part that can sink to the bottom will decrease, so sesame paste will be consumed more appropriately and will contribute to the country's economy.
AtıfScopus9WoS7OpenAlex7İncele - MakaleYalnız künye2024Synergistic Strategies for Overcoming Salt Stress in Strawberry Farming: The Use of Organic Fertilizers and Plant Growth Promoting Rhizobacteria (PGPR)
Yavuz, Aysegul; Erdogan, Ummugulsum; Turan, Metin; Argın, Sanem; Kocaman, Ayhan
The study was carried out under salt-stress conditions, and three non-microbial commercial organic fertilizers purchased from Humintech GmbH (Grevenbroich, Germany) were applied to the soil for strawberry plants. The three promoters were Fulvagra®, based on fulvic acid, Liqhumus®, based on humic acid, and Microsense Root®, also based on humic acid. Treatment with Fulvagra® resulted in a remarkable 69.90% increase in average fruit weight and a 39.52% increase in yield in strawberry plants. These improvements remained significant when combined with plant growth promoting rhizobacteria (PGPR), resulting in a 61.81% increase in fruit weight and a 45.21% increase in yield. Liqhumus® treatment resulted in a significant 49.95% increase in fruit weight and a 39.30% increase in fruit yield. The introduction of PGPR further enhanced these effects by increasing fruit weight by 87.70% and yield by 63.84%. The Microsense Root® treatment showed 31.07 and 61.87% improvements for the respective parameters. In conjunction with this treatment, the use of PGPR produced the most significant results, with increases of 121.14 and 65.37% for respective parameters. These results indicate that the combined use of non-microbial commercial organic fertilizers with PGPR leads to higher efficiency and is promising for sustainable agricultural practices, particularly in improving the resistance of strawberry plants to salt-induced stress.
AtıfScopus4WoS5OpenAlex5İncele - Kitap BölümüYalnız künye2024Afghans ante portas: Looking at immigrants in Turkiye through google's peephole
Keskin, Savaş; Kömür, Gökhan
Bauman"s approach, conceptualised as "strangers at out door/ante portas", requires a relationship that requires us to look at immigrants from inside the door. This study focuses on how Afghans, who are collectively expected to be hated as the new "dangerous" strangers, appear in Turkiye. The images pro-vided by Google searches become a suffcient "peephole" through which to collectively see and imagine Afghans. This is because the "peephole" metaphor encompasses a symbolic context in which the fear of the "strangers at out door (ante portas)", the desire to see/observe them, and the parallax effect can be symbolically represented at a common root. In the study, by typing "Afghans" and "Afghan Migrants" in Turkish into the Google search bar, the visual (photographic) search results are used to establish relationships with alienation and otherness in the visual representation of Afghan identity.
- MakaleYalnız künye2024Scopus SJRQ1The effect of sociodemographic characteristics and polypharmacy on loneliness and social isolation in community-dwelling older adults
Sönmez Sari, Ebru; Çetinkaya Özdemir, Serap; Semerci Çakmak, Vahide; Kurt, Fatma
The aim of this study was to assess the impact of sociodemographic factors and polypharmacy on loneliness and social isolation in older adults. This cross-sectional study included 370 older adults with and without polypharmacy. The data were gathered via the Personal Information Form, Loneliness Scale for Elderly, and Lubben Social Network Scale-Revised. A multivariate ANOVA (MANOVA) was conducted to assess the impact of independent variables on the combined dependent variables. Loneliness and social isolation were found higher in older adults with polypharmacy. In addition, loneliness and social isolation are more common in women, individuals with low educational attainment, single individuals, individuals with low income, individuals living in rural areas, individuals with poor family relationships, individuals not living with their families and individuals with chronic diseases. It is thought that the findings of this study will be guiding for all health professionals working in the field of elderly health in interventions to be planned for the elderly population.
AtıfScopus6WoS5OpenAlex5İncele - MakaleYayıncıda açık erişim2024Scopus SJRQ1Enhanced thermal and angular velocity-induced hybrid piezoelectric energy harvesting of smart turbine blades
Uyar, Mehmet
In this study, an approach is proposed to examine hybrid piezoelectric energy harvesting performances from vibrations induced by thermal and angular velocity loads in order to generate energy from the smart turbine blade. In the proposed method, a smart turbine blade is formed by patching the piezoelectric material to the root surface of the turbine blade. A finite element (FE) model of the smart turbine blade is established and then it is validated with a smart blade model in a reference study to test the reliability and accuracy of the FE method. The defined loads are applied to the smart blade to obtain energy from mechanical vibrations induced by thermal and angular velocity loads. Temperature distribution, voltage, and vibration results obtained from energy harvesting analysis under different thermal and angular velocity loads are presented. In order to investigate the energy conversion efficiency of the energy obtained from the system, the energy harvesting circuit is tested in terms of battery discharge times and power output values. The results show that while the maximum energy conversion in the thermally induced smart turbine blade is 11.9 W, a power output of 12.3 W is obtained from the hybrid energy harvesting mechanism under angular velocity and heat flux loads.
AtıfScopus5WoS5OpenAlex3İncele - MakaleAçık Erişim2024Ultra-thin Polarization Converter Using Single Layer Metasurface for X-, Ku-, and K-Band Applications
Arslan Madak, Seher Şeyma; Teber, Ahmet; Topkaya, Ramazan
In this article, an ultrathin (λ0/14.9), single layer, reflective type polarization converter for either linear-to-circular (LP-to-CP) or linear-to-linear (LP-to-LP) polarization conversion is reported. It has been demonstrated to achieve the LP-to-CP conversion at two separate frequency bands, including 11.52-11.84GHz and 19.83-20.01GHz. The circular polarization type is specified as a right-hand circular polarization (RHCP) for the first band and a left-hand circular polarization (LHCP) for the second band. In both of frequency bands, the metasurface structure reveals highly efficient features. Besides that, the metasurface structure exhibits highly efficient features within 3-dB bandwidths of 10.29-12.58GHz and 19.32-20.50GHz. Crucial parameters of polarization conversion such as ellipticity, axial ratio, and |Eco|/|Ecross| are confirmed to be in good agreement with another one. The metasurface structure's angular stability up to 200 oblique incidence angles makes it useful for beam scanning antennas. CST Microwave Studio program is utilized to carry out extensive simulations. This presented study offers a low cost, relatively high-performance, ultrathin polarization converter capable of linear-to-linear and circular polarization conversion in the X-, Ku-, and K-bands.
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