06. Meslek Yüksekokulları
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Article Citation - WoS: 28Citation - Scopus: 33Comparison of Commercial and Traditional Kefir Microbiota Using Metagenomic Analysis(WILEY, 2021) Biçer, Yusuf; Telli, Arife Ezgi; Sönmez, Gonca; Turkal, Gamze; Telli, Nihat; Uçar, GürkanThe current study aimed to determine the bacterial microbiota of five commercial and one traditional kefir beverages consumed in Turkey. In all samples, Firmicutes (93.66%-99.98%) were the most abundant filum. Actinobacteria were detected (6.19%) in one commercial sample, and Proteobacteria were detected (5.91%) in the traditional kefir beverage. The dominant family in all commercial kefir beverages was Streptococcaceae (89.12-99.83%), and the most common genus was Lactococcus in three samples and Streptococcus in the other two samples. However, Lactobacillaceae (36.68%) and Streptococcaceae (36.68%) were dominant in traditional kefir. Lactococcus, Streptococcus and Enterococcus were common in all samples.Article Determination of Thermotolerant Campylobacter Spp. by Viability-Qpcr in a Poultry Slaughterhouse and in Retail(Eugen Ulmer Gmbh Co, 2021) Telli, E.; Uçar, G.; Sönmez, G.; Telli, N.; Türkal, G.; Doğruer, Y.This study aimed to evaluate the viability of thermotolerant Campylobacter spp. in chicken carcasses during the slaughter process (n = 150) and at retail level (n = 72). All samples were analysed by quantitative PCR (qPCR), propidium monoazide (PMA)-treated qPCR, and direct plate counting (DPC). The quantitative comparisons were performed for assessing viability and culturability according to the values of the samples that were found to be positive in all methods. Due to the underestimation of viable but unculturable (VBNC) or dead cells, PMA-untreated samples, either at different slaughter stages or at retail level, had a higher positivity and quantity rate (p < 0.05) than the PMA-treated and DPC samples. Across the slaughter line, the above mentioned three methods revealed the highest positivity and quantity level during the evisceration stage. After the water-chilling and storage phases, positivity and quantity rates were not comparable as PMA-qPCR and DPC failed to detect the level of contamination not only in terms of cultivability but also in terms of viability as a result of compromised membrane integrity at low temperatures. In conclusion, recording of Campylobacter spp. during the chicken slaughter process by PMA-treated qPCR would provide more realistic quantitative data for poultry meat contamination.Article The Effect of Cutting Direction and Water Based Varnish Type on Sound Absorption Coefficient in Some Native Wood Species(2024) Muslu, Mustafa SelmaniNoise which could be defined as disturbing sound, is becoming a major problem depending with developing technology. Controlling the noise helps raising the quality of life to higher levels. Although the intensity of the noise is not at a level that will affect human health, it should be reduced or eliminated, for better life standart. Due to the adverse effects of the noise level on health; the acoustic properties of living areas require serious consideration. Sound absorption coefficients of the materials used in the interior play an important role in providing sensory comfort depending on the volume. Natural and artificial wood are commonly used materials in interior design, especially in the construction of partition elements. In addition, wood is natural material and it has some important advantages and disadvantages. In this study the sound absorption coefficients of eastern beech and scotch pine trees, which are the most preferred materials in in-terior design, were investigated. For this pupose, these wood materials were cut superficially and radially according to the intersection directions, then the sample surfaces were varnished with one and two component water-based varnishes that do not contain solvent-based resin. The sound absorption coefficients of the ob-tained samples were determined by the impedance tube method and the results were compared statistically. It has been investigated that the obtained results could be evaluated statistically within the frequency values, besides, different results could be obtained according to the characteristics of natural wood materials, the direc-tion of intersection and water-based varnish types. According to the findings obtained as a result of the study, it has been suggested that if natural wood material is used indoors, the superficial cross-section of East beech wood should be used according to the direction of intersection, and a two-component varnish should be used according to the varnish type.Article Citation - WoS: 13Citation - Scopus: 16The Fuzzy Logic-Based Modeling of a Micro-Scale Sloped Solar Chimney Power Plant(KOREAN SOC MECHANICAL ENGINEERS, 2021) Güzel, Muhammed Hüseyin; Ünal Ercan, Hatice; Önder, Ahmet; Şen, Muhammed Arif; Köse, FarukThe energy demand of world is increasing worldwide because of increasing population and developing technology. The use of environmentally friendly renewable resources is very important in providing the increasing energy needs. In the renewable energy sources, the solar energy has a strategic importance because of its huge potential and unlimited. The production of electrical energy by solar chimney power plants is one of the reliable and profitable methods. Fuzzy logic-based approaches are commonly used for modeling different systems in many fields. Also, a renewable energy system can be modelled by fuzzy definitions. In this way, it can provide efficiently and quickly theoretical estimates of systems with productive simulations. In this study, using the experimental data obtained from the micro-scale sloped solar chimney power plant in carried on scientific research project by authors, the obtaining and verifying a fuzzy logic-based model (FLBM) that can calculate the change in air velocity at turbine according to the change of radiation and temperature is presented. The air velocity at the turbine inlet is the considerable variable determining the electricity generation in a solar chimney. Thus, the output of the model is determined as this air velocity. In changes in the radiation and temperature values are defined as inputs. A two input-one output fuzzy model is obtained, in which the inference method is designed in the form of Mamdani and the membership functions in the form of the triangle, making inferences according to the rule base determined by the experience achieved from the experimentally studies. In order to investigate the accuracy of the FLBM, the simulation results and the data get from experimental setup in April 2019 are compared and evaluated. The validation of the FLBM compared to the experimental system is investigated using different error evaluation criteria. It is proved that the results of FLBM and experimental data are realized at a high rate (95.95 %) close to each other and similarly.Article Citation - WoS: 2Citation - Scopus: 2Synthesis and Application of Colloidal Cds Quantum Dots as Interface Modification Material in Perovskite Solar Cells(Scientific Technical Research Council Turkey-Tubitak, 2021) Yenel, EsmaIn this study, colloidal CdS quantum dots were synthesized, structurally characterized, and their effect on performance of perovskite solar cells was observed by using them as interface modification agent between TiO2/perovskite. Colloidal CdS quantum dots were synthesized based on two-phase method and characterized by X-ray diffraction and Transmission Electron Microscopy techniques. The average particle size of CdS quantum dots have found to be around 5 nm. Oleic acid was used as capping agent during synthesis to lead solubility in organic solvents. Obtained quantum dots are coated on compact TiO2 layer for surface modification. A decrease was observed when oleic acid capped CdS quantum dots were used at interface, while significant improvement was observed when ligand exchange was carried out by pyridine before perovskite layer. Reference solar cells showed 11.6% efficiency, while pyridine capped CdS modified solar cells' efficiency was 13.2%. Besides the improvement in efficiency, reproducibility of solar cells also was increased by using pyridine capped CdS as interface material.Article Citation - WoS: 2Citation - Scopus: 2Wind-Effected Dynamic Quadrotor Route Planning With Metaheuristic Methods in Different Weather Conditions(Univ Suceava, Fac Electrical Eng, 2021) İncekara, Hayri; Selek, MuratIn cases where Quadrotors, which are increasingly important rotary-wing Unmanned Aerial Vehicles (UAVs), are required to visit more than one location, route planning should be done to reduce the cost of flight and increase the efficiency. In this study, it is aimed to reduce the flight time and increase the efficiency of Quadrotor Route Planning (QRP) based on the changes in wind speed and wind angle. To achieve this, a dynamic QRP application which can generate routes which are suitable for changing environmental conditions by using instantaneous wind data and real location coordinates has been developed. In this application, Genetic Algorithm (GA), Tabu Search and Traveling Salesman Problem (TSP) with GA metaheuristic methods were used comparatively to optimize QRP according to flight time. Among these methods, the TSP with GA method is the metaheuristic method that gave the most optimal results. When the results are examined, it is seen that wind effect dynamic QRP that uses TSP and GA method provides up to 26% improvements in flight time compared to Standard QRP that uses TSP with GA method.
