06. Meslek Yüksekokulları

Permanent URI for this communityhttps://hdl.handle.net/20.500.13091/1628

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Citation - WoS: 12
Citation - Scopus: 17
Acoustic-Driven Airflow Flame Extinguishing System Design and Analysis of Capabilities of Low Frequency in Different Fuels
(Springer, 2022) Taşpınar, Yavuz Selim; Köklü, Murat; Altın, Mustafa
Traditional fire extinguishing methods can harm people and nature. For this purpose, in this study, no harmful acoustic-driven airflow fire extinguishing system was developed and experiments were carried out to extinguish gasoline, kerosene, thinner (synthetic thinner) liquid fuels and liquid petroleum gas (LPG) flames. 17,442 extinguishing experiments were conducted in 5 different flame sizes, 54 different frequencies and 10 cm to 190 cm distance range. The data obtained were analyzed using the polynomial regression method. For liquid fuels, the frequencies of 10 Hz to 50 Hz at a distance of 10 cm to 100 cm, 10 Hz to 32 Hz at a distance of 100 cm to 150 cm, and 10 Hz to 28 Hz at a distance of 150 cm to 180 cm are effective extinguishing ranges. LPG fuel, 10 Hz to 45 Hz at a distance of 10 cm to 140 cm, frequencies of 15 Hz to 30 Hz at a distance of 140 cm to 180 cm are effective extinguishing ranges. In addition, caused by the compression of the woofers membrane inside the collimator and the injected airflow at frequency of 30 Hz reduced the 12 cm diameter metal plate from 86.2 degrees C to 18.8 degrees C in 5 min, and the metal plate left to cool down from 80 degrees C to 21.7 degrees C in 10 min at a distance of 100 cm. The average Mean Square Error value obtained as a result of polynomial regression analysis is 0.9544, and the Root Mean Square Error value is 1.2020.
Analysis of the Studies Done on Laboratories in Turkey
(2020) Yener Dündar; Köklü, Niğmet; Yamaç Ramazan Ziya; Yalçın Seher
The aim of this study is to determine the trend of studies in the laboratory and put the current situation in Turkey. For this purpose, document analysis technique, one of the qualitative research methods, was used in the research. The data group of the research consists of thesis studies on laboratories in our country between 1999-2017. Theses in the fields of science, physics, chemistry, and biology have been determined and themes and sub-themes have been created through the keywords of these theses. Then, frequency tables were created according to the themes and sub-themes created. According to the findings obtained, it was seen that the traditional laboratory approach and inquiry-based laboratory approaches are compared in the studies. It was determined that the studies were done on physics subjects and it was determined that complementary measurement and evaluation studies performed for performance evaluation were used in very fewnumbers. In addition, it was concluded that the keywords did not give enough information about the studies. In this context, it can be suggested to examine the effectiveness of these approaches according to each other and experiment types by examining theapproaches in which students can be more active in laboratories.
Citation - WoS: 7
Citation - Scopus: 6
Characteristics and Evolution of the Etili Silica Sinter Epithermal Deposits, Canakkale - Turkey: Relation To Alkali Chloride Vs Acid-Sulfate Fluids
(Elsevier, 2022) Ercan, Hatice Ünal; Ece, O. Işık; Schroeder, Paul A.; Gülmez, Fatma
The Oligo-Miocene Etili epithermal deposits are a well-preserved fossil geothermal system in the Canakkale Region and is one of the largest fossil siliceous hot spring deposits of Turkey. Main E-W and NE-SW trending faults systems occur with minor NW-SE fracture systems perpendicular to the main faults. Silica-rich deposits are commonly observed in or on the calc-alkaline tuffs, ashes and pyroclastic rocks that were the products of the magmatism controlled by the extensional tectonic regime. The Etili epithermal system was examined at two representative locations including the Hamamtepe and Muratlar sites. Morphologies of the proximal apron were defined by lithofacies that included silica infiltrate, spring conduits, nodular and finely laminated geyserite, sinter clast breccia, silicified volcanic rocks, and epithermal veins. Microfossils were detected in mat structures developed in the proximal apron. The silica deposits have low abundances of altered mineral assemblages (e.g., kaolinite, halloysite, and alunite), which are otherwise commonly observed in the region. The origin of the Etili Fossil Silica Sinter Region (EFSSR) was constrained by using geochemical and isotopic data. delta O-18 and dD isotopic values of kaolinites ranged +9.4/+9.6 parts per thousand; to 84/74 parts per thousand respectively. delta O-18 isotopic values from siliceous and silicified samples ranged from 8.3 to 18.4 parts per thousand, which shows two different formation types for the Etili Fossil Silica Sinter Region. We hypothesized hypogene origins for the kaolins and a mixed hypo/supergene origin for siliceous and silicified samples. The calculated model formation temperature from the delta O-18 values of the silica and siliceous samples is in the range of 63 degrees to 140 degrees C. delta S-34 isotopic values of alunite ranged from -19.6 to +16.6 parts per thousand, which also indicated two different sources that include magmatic hydrothermal and meteoric waters affected by bacterial activity. The timing of acid-sulphate alteration can be grouped into three periods by Ar-40/Ar-39 dating of alunites. These ages are: (A) 32.4 +/- 1.2 to 22.6 +/- 0.22 Ma in the Muratlar silica site, (B) 12.3 +/- 0.3 to 15.2 +/- 0.3 Ma in the northern part of the Hamamtepe site and (C) 5 +/- 0.18 to 7 +/- 0.3 Ma in the southern part of the Hamamtepe silica site. These consistent findings show that the emplacement periods of the Evciler pluton and the ages of alteration deposits are similar to each other. Silica sinters and geyser mounds represent very late stage near-neutral pH alkali chloride geothermal activities. The epithermal deposits in the EFSSR comprises a complex history of three different hydrothermal processes, each of which have different compositional and temporal emplacement periods related to the Evciler pluton.
Citation - WoS: 3
Citation - Scopus: 4
Cnn Based Sensor Fusion Method for Real-Time Autonomous Robotics Systems
(Tubitak Scientific & Technical Research Council Turkey, 2022) Yıldız, Berat; Durdu, Akif; Kayabaşı, Ahmet; Duramaz, Mehmet
Autonomous robotic systems (ARS) serve in many areas of daily life. The sensors have critical importance for these systems. The sensor data obtained from the environment should be as accurate and reliable as possible and correctly interpreted by the autonomous robot. Since sensors have advantages and disadvantages over each other they should be used together to reduce errors. In this study, Convolutional Neural Network (CNN) based sensor fusion was applied to ARS to contribute the autonomous driving. In a real-time application, a camera and LIDAR sensor were tested with these networks. The novelty of this work is that the uniquely collected data set was trained in a new CNN network and sensor fusion was performed between CNN layers. The results showed that CNN based sensor fusion process was more effective than the individual usage of the sensors on the ARS.
Citation - WoS: 13
Citation - Scopus: 15
Determination of Some Physical and Chemical Properties of Common Hawthorn (crataegus Monogyna Jacq. Var. Monogyna)
(SPRINGER, 2021) Dokumacı, Keziban Yalçın; Uslu, Nurhan; Hacıseferoğulları, Haydar; Örnek, M. Nevzat
Hawthorn as a wild plant is an important fruit for human health. In this study, it was aimed to determine some physical and chemical properties of common hawthorn which is native plant of middle Anatolia in Turkey. According to chemical analysis results, crude protein, crude oil, ash, pH, acidity, total phenol contents and antioxidant activity values were found to be 3.03%, 1.22%, 2.77%, 4.08, 1.56%, 9.35 mg g(-1) and 67.62% respectively. Some mineral matter contents as K, P, Ca, Mg, Fe, Na and B values were found to be 16,273.88 mg kg(-1), 1316.92 mg kg(-1), 1263.86 mg kg(-1), 934.87 mg kg(-1), 62.20 mg kg(-1), 57.06 mg kg(-1) and 42.28 mg kg(-1) respectively. The values of mass, diameter, length, geometric mean diameter and sphericity of Common hawthorn fruit were determined as 0.93 g, 11.37 mm, 12.25 mm, 11.65 mm and 0.95 at 68.98% (db) humidity respectively. In addition, fruit hardness, chroma (C*), hue angle (h*) of hawthorn was found as 1.21 N, 28.94 ve 16.19 under same humidity respectively. According to study results, it can be concluded that the hawthorn fruits are admirable natural food for human nutrition, and it can be considered as reference for the future researches.
Citation - WoS: 15
Citation - Scopus: 15
Developing a Deep Neural Network Model for Predicting Carrots Volume
(SPRINGER, 2021) Örnek, Mustafa Nevzat; Örnek, Humar Kahramanlı
In this paper, a deep learning approach to predict carrots volume according to the physical properties was designed. A total of 464 carrots were used for volume prediction. The used carrots were taken from Kasinhani, Konya. First, the data was produced. For this, the length, the diameters with 5 cm intervals, and the volume of each carrot were measured and recorded. The measurements were done using a steel ruler, a vernier caliper, and a glass graduated cylinder. Two deep learning methods: DFN and LSTM were developed to predict carrot volume. The developed systems were implemented with the Keras library for Python. Statistical measures such as Root Mean Squared Error, Mean Absolute Error, and R-2 were used to determine the predicting accuracy of the system. Both methods produced very close values. DFN and LSTM networks achieved 0.9765 and 0.9766 R-2, respectively. RMSE values were 0.0312 for both models. The results obtained showed that both DFN and LSTM are successful and applicable to this task.
Citation - WoS: 1
Citation - Scopus: 1
An Easy-To Self-Healing Smart Design for Increasing Impact Strength and Crashworthiness Resistance of Honeycomb Sandwich Structures
(Sage Publications Ltd, 2022) Güçlü, Harun; Osmanoglu, Serhat; Hayırkuş, Aslıhan; Taş, Oğuzhan; Yazıcı, Murat
In this paper, the dynamic compression impact response of an aluminum honeycomb core filled with open-cell foams impregnated with self-healing liquid agents was investigated experimentally. Samples were subjected to a variety of impacts in order to determine healing time and self-healing performance. Three different sandwich specimens were developed to evaluate the effectiveness of self-healing. The sandwich specimens are designated as B (empty honeycomb core cells), S (only open-cell soft polyurethane foam-filled honeycomb core cells), and self-healing agent (SHA) (open-cell soft polyurethane foams impregnated with liquid self-healing agents). The test results were presented by considering the crashworthiness and healing efficiency criteria, and the impact characteristics of the samples were compared related to these criteria. After testing, the results demonstrated that the self-healing agent specimens had much fewer buckling deformation and displacement than their counterparts. Significant improvements were achieved in healing efficiencies and crashworthiness evaluation criteria. The peak load and the energy needed to attain peak load are considered healing efficiency criteria. Self-healing agent specimens reached 29.7% and 12.9% more peak loads, and in the energy absorbed up to peak loads 140% and 34.9% higher values than the B and S sandwiches. In the same samples, crushing strain features were acquired as 50% versus 66%, indicating less displacement in self-healing agent specimens than counterparts. The results indicated that an aluminum honeycomb sandwich structure that can heal itself after damage and recover impact characteristics remarkably could be produced practically.
Citation - WoS: 8
Citation - Scopus: 9
An Experimental Performance Comparison of Newtonian and Non-Newtonian Fluids on a Centrifugal Blood Pump
(Sage Publications Ltd, 2022) Önder, Ahmet; Yapıcı, Rafet; İncebay, Ömer
The use of substitute fluid with similar rheological properties instead of blood is important due to ethical concerns and high blood volume consumption in pump performance test before clinical applications. The performance of a centrifugal blood pump with hydrodynamic journal bearing is experimentally tested using Newtonian 40% aqueous glycerin solution (GS) and non-Newtonian aqueous xanthan gum solution of 600 ppm (XGS) as working fluids. Experiments are performed at four different rotational speeds which are 2700, 3000, 3300, and 3600 rpm; experiments using GS reach between 8.5% and 37.2% higher head curve than experiments using the XGS for every rotational speed. It was observed that as the rotational speed and flow rate increase, the head curve difference between GS and XGS decreases. This result can be attributed to the friction reduction effect when using XGS in experiments at high rotation speed and high flow rate. Moreover, due to different fluid viscosities, differences in hydraulic efficiency were observed for both fluids. This study reveals that the use of Newtonian fluids as working fluids is not sufficient to determine the actual performance of a blood pump, and the performance effects of non-Newtonian fluids are remarkably important in pump performance optimizations.
Citation - WoS: 21
Citation - Scopus: 22
Hplc-Dad Characterization of Phenolic Profile and in Vitro Antioxidant, Anticholinesterase, and Antidiabetic Activities of Five Mushroom Species From Turkey
(Springer Heidelberg, 2021) Çayan, Fatih; Tel-Çayan, Gülşen; Deveci, Ebru; Duru, Mehmet Emin
In this study, Daedalea quercina (L.) Pers., Hydnum repandum L., Inonotus radiatus (Sowerby) P. Karst., Omphalotus olearius (DC.) Singer, and Schizophyllum commune Fr. hexane and methanol extracts were subjected to the spectrophotometric assays for antioxidant and enzyme inhibitory activities, which are linked with human diseases that are very prevalent in recent years. Additionally, phenolic compounds of the mushrooms were quantified by HPLC-DAD. The best antioxidant activity was found in H. repandum methanol extract (IC50: 12.04 +/- 0.24 mu g/mL) in the beta -carotene-linoleic assay; I. radiatus methanol extract in DPPH center dot (81.22 +/- 0.50%), ABTS(center dot+) (IC50: 73.47 +/- 0.18 mu g/mL), and CUPRAC (A(0.50): 88.21 +/- 0.02 mu g/mL) assays; S. commune hexane extract (53.36 +/- 0.89%) in the metal chelating assay. O. olearius hexane extract was found as the best inhibitor against AChE (71.58 +/- 0.28%) and BChE (67.30 +/- 0.15%). When I. radiatus methanol (95.88 +/- 0.74%) and H. repandum hexane (95.75 +/- 0.16%) extracts showed close alpha -amylase inhibitory activity to acarbose (96.68 +/- 0.08%), D. quercina methanol extract (70.79 +/- 0.34%) had higher alpha -glucosidase inhibitory activity than acarbose (67.01 +/- 2.28%). Among 16 phenolic compounds analyzed, gallic acid (0.02 +/- 0.01-0.23 +/- 0.01 mu g/g) was detected in all studied mushrooms. This study provides that investigated mushrooms can be used for further research, which can lead to the development of new natural remedies to alleviate complications related to oxidative stress, diabetes, and neurological diseases.
Citation - WoS: 4
Citation - Scopus: 2
The Investigation of Structural and Magnetic Properties of Er2-Xcoxo3 Nano-Oxides
(Springer, 2022) Heiba, Zein K.; Arda, Lutfi; Doğan, Nurcan; Karatas, Ozgul; Mohamed, Mohamed Bakr
The sol-gel technique was used to synthesize Er2-xCoxO3 (0.0 <= x <= 0.30) mixed oxides to analyze structural and magnetic properties. The Rietveld analyses show that Er2-xCoxO3 nanoparticles up to x = 0.1 have single phase, for x >= 0.2 Co3O4 phase appears. Preferential cationic distribution between the non-equivalent sites 8b and 24d is found for all samples. A systematic variation is found in the average maximum strain with composition x. The magnetic analysis showed that super-paramagnetism is the reason of S-shaped hysteresis loops and also non-zero magnetic moments. Both Mr and Ms increased with increasing concentration of Co+2.
Citation - WoS: 7
Citation - Scopus: 5
Investigation on the Cost-Effective Optimal Dimensions of a Solar Chimney With the Bees Algorithm
(Springer Heidelberg, 2022) Ünal, Recep Emre; Güzel, Muhammed Hüseyin; Sen, Muhammed Arif; Köse, Faruk; Kalyoncu, Mete
Solar chimney systems which consist of three main parts (collector, chimney, turbine) are one of the main thermal methods that produce electricity using solar energy. In a solar chimney, the high-power generation that can be obtained by increasing the design dimensions can also cause ineffective high investment costs. In this study, differing from the traditional design approach, a heuristic optimization method based on the Bees Algorithm is present to obtain the optimum design parameters (the chimney and collector dimensions) that are provided the more effective solutions. It is made for 3 configurations in order to prove the accuracy of the optimization study using different algorithm parameters. By using the obtained mathematical equations and the defined non-currency investment cost unit for a traditional solar chimney, the optimum design parameters that can provide more power output with acceptable costs are investigated. Two main objectives are taken into consideration namely maximizing efficiency of solar chimney system and minimizing investment cost. In the optimization process, within the ranges determined for the decision variables, the maximum and minimum dimensions are determined as 1293.05-1330.47 m for the collector diameter, 94-99 m for the chimney diameter and 783-792 m for the chimney height. The obtained results showed that this open to develop approach proposed within the scope of the study can be useful in the optimal design of solar chimney systems.
Citation - WoS: 10
Citation - Scopus: 9
Land Reallocation Model With Simulated Annealing Algorithm
(TAYLOR & FRANCIS LTD, 2021) Ertunç, Ela; Uyan, Mevlüt; Tongur, Vahit
Land consolidation project has many stages. Land reallocation is the most considerable stage in which many factors play a role and forms the basis of this project. In this study, a new optimisation-based reallocation model has been developed to realise block reallocation by evaluating the requests of landowners. The reallocation according to the developed method also reset the block spaces automatically. The most powerful aspect of the method is that while the reallocation phase in land consolidation projects takes weeks and months, this method can be done in minutes. This method contributes to projects in terms of time and cost.
Citation - WoS: 1
Citation - Scopus: 1
Uridine as Additive in Antisolvent for Improving Performance and Reproducibility of Perovskite Solar Cells
(Springer, 2022) Yenel, Esma; Deveci, İlyas
Today, with their high efficiency of up to 25%, perovskite solar cells are the best alternative to silicon solar panels, which have relatively difficult manufacturing process, with the increasing trend toward clean energy. Despite their high efficiency, there are some issues such as reproducibility that must be solved. Additive engineering is most promising method for overcoming this problem. In this study, Uridine molecule, which is pyrimidine nucleoside and has important role in living organism, was investigated as additive in secondary butanol with different concentrations (1/10, 1/20, 1/50, 1/100, and 1/300 dilutions from saturated solution). Secondary butanol was employed in antisolvent washing step during device fabrication. Obtained results were compared with the results that of device referred as reference and fabricated without using Uridine. The results showed that the average efficiencies and reproducibility of device increase by Uridine doping. The highest efficiency increase was obtained for the device fabricated using solutions, including Uridine with 1/50 dilution. The Uridine molecule deposited between boundary layer and the perovskite grains promoted the charge transfer rate by means of passivating the traps formed during the fast crystal growth.

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