Naturengs Mühendislik ve Doğa Bilimleri Dergisi
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Öğe THE THERMAL AND MECHANICAL PROPERTIES OF BUILDING STONES FROM THE AFYON, İZMİR, MUĞLA AND DENİZLİ REGION(MTÜ, 2022) BİÇER,AyşeThis study investigated the thermal and mechanical properties of Iscehisar stone (Afyon), Alacati stone (İzmir), Milas Marble (Muğla), and Denizli schist (Denizli). Samples were taken from quarries for each stone. Chemical analyses were carried out. Afterward, thermal conductivity, compressive stress, water absorption, water vapor permeability, and wear experiments were conducted. Alacati stone had the highest thermal conductivity (0.381 W/mK). Denizli schist had the highest compressive strength (95 MPa). All samples had water absorption rates lower than 30%. The results were compared with other building materials regarding energy-saving, strength, and comfortÖğe Classification of Single and Combined Power Quality Disturbances Using Stockwell Transform, ReliefF Feature Selection Method and Multilayer Perceptron Algorithm(MTÜ, 2022) AKMAZ,DüzgünIn this study, a method based on Stockwell transform (ST), ReliefF feature selection method and Multilayer Perceptron Algorithm (MPA) algorithm was developed for classification of Power Quality (PQ) disturbance signals. First of all, ST was applied to different PQ signals to obtain classification features in the method. Then, total of 30 different classification features were obtained by taking different entropy values of the matrix obtained after ST and different entropy values of the PQ signals. The use of all of the classification features obtained causes the method to be complicated and the training/testing times to be prolonged. Therefore, so as to determine the effective ones among the classification features and to ensure high classification success with less classification features, ReliefF feature selection method was used in this study. PQ disturbances were classified by using 8 different classification features determined by ReliefF feature selection method and MPA. The simulation results show that the method provides a high classification success in a shorter training/testing time. At the same time, simulation results have shown that the method was successful on testing data with noise levels of 35 dB and above after only one trainingÖğe Pluriharmonic conformal bi-slant Riemannian maps(MTÜ, 2022) YANAN,ŞenerIn this study, notion of pluriharmonic map applied onto conformal bi-slant Riemannian maps from a Kaehler manifold to a Riemannian manifold to examine its geometric properties. Such that, relations between pluriharmonic map, horizontally homothetic map and totally geodesic map were obtained.Öğe Microfluidic Technology and Biomedical Field(Malatya Turgut Özal Üniversitesi, 2021) Tüylek, ZülfüIt is seen that the development of microfluidic laboratories working passively on chips has increased over the years. The field of microfluidics includes the use of microstructured devices, which typically have micrometer sizes and allow precise processing of low volumes. Nano fields are the main fields of nanotechnology, which includes science fields such as earth science, organic chemistry, molecular biology, semiconductor physics, micromachinery where the control of the atomic and molecular unit will take place. New techniques are needed to meet existing needs for the development phase. Micro and nano-volume multi-stage systems through micrometer-sized channels and microfluidics, which are many applied science branches, have become widespread in engineering. The circulation of fluids in systems through micrometer-sized channels examines factors that can affect the behavior of fluids, such as surface tension, energy use, and fluid resistance in the system. Microfluidic devices and systems have a variety of functions to replace routine biomedical analysis and diagnostics. It emphasizes a higher level of system integration with advanced automation, control and High Efficiency processing potential while consuming small amounts of sample and reagent in less time. Thanks to miniaturization, better diagnostic speed, cost effectiveness, ergonomics and sensitivity can be achieved. This article describes microfluidic technology, including system components. Literature review will be made in studies completed or ongoing world wide. The mechanisms, applications and recent developments related to microfluidic techniques are listed. Presents current research topics and possible future research in the biomedical field in microfluidic technology.Öğe The Usage of Mg - Metal Chlorides in Hydrogen Generation(2021) Aytaş,Begüm Esra; Karaoğlu,Sevim YolcularThe reaction of metals with water is one of the hydrogen generation methods. Mg stands out as a viable alternative when compared to other metals for producing hydrogen. However, the emergence of Mg(OH)2, which interrupts hydrogen production in its reaction with water, has led to the search for new methods to improve the hydrogen production process. For this reason, in our study, chloride salts (CoCl2 and AlCl3) have been used to improve hydrogen generation. The composites have been prepared with the addition of different chlorides (AlCl3 and CoCl2) into Mg with ball milling. AlCl3 and CoCl2 have been used separately and together while forming Mg metal composite powder. Powder mixtures have been grounded by a planetary ball mill at different times (2 and 4 hours). Deformations, which are thought to contribute positively to the reaction, have been obtained on the metal surface with ball milling. The microscopic images of the powder mixtures have been analyzed by SEM. In addition, distilled water, acetic acid and citric acid have been used in our study to observe the effects of hydrogen production. When distilled water has been used with powder mixtures in the hydrogen generation experiments, a minimal amount of hydrogen gas output has been observed. It has been observed that the use of acetic acid or citric acid solutions significantly enhances the amount of hydrogen formed. 4 hours milled Mg- 10wt% CoCl2 composite has the best hydrolysis properties for all experiments with its 138 ml of hydrogen generation at 30oC in 30 ml, 2 M citric acid solution.Öğe Quantum Chemical Calculations on Fentanyl Used as Potent Analgesic(Malatya Turgut Özal Üniversitesi, 2021) Serin, Sümeyya; Utku, Tuğba; Kaya, GülsenThis current study dealt with the quantum chemical analysis on fentanyl compound, which is a potent synthetic analgesic. First of all, the geometry optimizations were carried out via Density Functional Theory (DFT) and Hartree-Fock (HF) methods in both the gas and the water phase. The B3LYP functional and the HF method were used with the 6-31G (d,p) and 6-31++G (d,p) basis sets. Computed structural parameters were compared with the data available in the literature and consistent results were obtained for all four different methodologies. Charge distributions of each atom of fentanyl were obtained by Mulliken and natural population analysis. Accompanied by calculated molecular descriptors, the results of frontier molecular orbital (FMO) analysis and natural bond orbital (NBO) analysis were reported. Finally, molecular electrostatic potential (MEP) analysis has been performed to estimate reactive sites for electrophilic and nucleophilic attack. Total density, ESP, MEP, and contour maps were visualized at B3LYP/6-31++G (d,p) level of theory.Öğe Investigation of Hygiene Knowledge Levels of Kitchen Staff in Diyarbakir Provincial State Hospitals(2021) İldeniz,Gurbet; Küşümler, Aylin SeylamThis research was carried out to investigate the hygiene knowledge level of the personnel working in the nutrition/beverage service and kitchen of hospitals that provide mass feeding in Diyarbakır. For this purpose, a survey form of 94 questions was applied to a total of 150 people, 117 men and 33 women, working in three hospital kitchens in the central district of Diyarbakır. The study was initiated after the approval of the ethics committee of Okan University, dated 08.05.2019 with the meeting number 108 and decision number 6. According to the data obtained from the research, 78% of the staff working in the the institutional kitchens in Diyarbakir province were male and 22% were female. It was determined that the job duration in the profession was concentrated between 2-5 years (40.7%). Also, it is seen that the personnel received hygiene training make up the vast majority, such as 95.3%. A significant difference was found between the groups in terms of personal hygiene and personnel hygiene competence and also between the age groups of the personnel participated in our study. It has been observed that the knowledge of all those who got HACCP training at school is sufficient while others (who got training in a course or master’s) have less knowledge. It has been observed that the knowledge of the staff on hand hygiene and HACCP system is low. Moreover, it has observed that the personnel knowledge on hand hygiene and HACCP system is low.Öğe The Thermal and Mechanical Properties of the Building Stones in Eskisehir - Kayseri and Kırsehir regions(Malatya Turgut Özal Üniversitesi, 2021) Biçer, AyşeIn this study, certain physical properties of Derbent (Eskisehir), Tomarza (Kayseri) and Mucur (Kırsehir) stones, which are used as building materials in the relevant regions, are subjected to analysis. For each stone, the samples were taken from two separate quarries, after which the chemical analysis, thermal conductivity, compression stress, water absorption, breathability and abrasion tests were carried out. The results obtained from the tests carried out are as follows: i) It is understood that Eskisehir Derbent tuff and Tomarza stones can be used as briquettes, bricks or aggregates as lightweight concrete thanks to their low thermal conductivity values (0.355 W/mK and 0.581 W/mK) and heat insulation properties. ii) Kırşehir Mucur stone shows that it can be used in load bearing wall material and abrasion resistant flooring with 88.46 MPa compressive strength and 0.4% volume abrasion values. iii) It has also been conferred that three stones have rich reserves and low costs. The results are compared with other building materials, especially in terms of energy saving, strength and comfort conditions.Öğe A Note On The Generalized k-Fibonacci Sequence(2021) Panwar, YashwantIn this paper, we present a generalization of well-known k-Fibonacci sequence. Namely, we defined generalized k-Fibonacci sequence. This sequence generalizes others, k-Fibonacci sequence, classical Fibonacci sequence, Pell sequence and Jacobsthal sequence. We establish some of the interesting properties of generalized k-Fibonacci sequence. Also, we obtain a generating function for them.Öğe Activation and Characterization of Unye (Ordu) Clay with Nitric Acid(2021) Akbulut,Yeliz; Önal,YunusIn this study, Clay belonging to the Ordu Unye region was activated by different concentrations of the acid solution by analytical methods. It is intended to remove adsorbed components between layers found in the structure of the clay. As a result, the activation process was performed with nitric acid (HNO3) to enable the expansion of the distance between layers. Determination of structural changes of Natural Clay and activated clays has been characterized by XRD, SEM, FTIR and BET analyses. Characterization results showed that acid activation caused significant increases in surface area and pore volumes by changing both morphological and surface properties on clay. As a result of activation, the highest surface area of the clay was determined as 205,08 m2/g with 2N HNO3. Acid activation has been found to be more efficient in improving the surface properties of clay.Öğe Effects of Different Nose Cone Designs on Trajectory and Impact Angle of Smart Fire Extinguishing Ammunition(Malatya Turgut Özal Üniversitesi, 2021) Toptaş, Murat; Yılmaz,MehmetA nose cone is the conically shaped tip part of a missile, bomb or aircraft, used to regulate the behavior of oncoming airflow and minimize drag. In this study, the effects of different nose cone designs on the trajectory and impact angle of smart fire extinguishing ammunition were investigated. For this purpose, three different types of ammunition with different nose cone profiles were designed: spherically blunted conic nose cone, spherically blunted tangent ogive nose cone and truncated tangent ogive nose cone. A virtual wind tunnel was created in the computer environment and a CFD software was used to calculate the drag coefficients for each design. By applying Newton's second law of motion, the horizontal distance the ammunition received before striking fire, impact speed, and impact angle were calculated. The obtained results were compared using One-Way ANOVA (analysis of variance) in order to determine whether there is statistical evidence that the associated population means are significantly different. It was determined that the three types of nose cone designs examined did not have a significant effect on the impact speed, impact angle and horizontal distance of the ammunition at the investigated speeds and altitudes. On the other hand, flame detection, distance measurement and impact sensors, which should be in the smart fire extinguishing ammunition, should be on the plane at the front of the ammunition and in contact with the external environment. In order to place these sensors in the nose cone, a truncated tangent ogive nose cone was chosen as the nose cone for the smart fire extinguishing ammunition.Öğe Attitudes Towards Vaccines And Intention to Vaccinate Against Covid-19: A Statistical Analyze(Malatya Turgut Özal Üniversitesi, 2021) Özcan, Burcu; Yıldırak, Edanur; Aksoy, ZeynepPresent study aims to analyze the attitude towards Covid 19 vaccine in Kocaeli province and the factors that may cause this attitude. Data were applied to 248 people via an online survey. The survey consists of three parts: demographic data, data on vaccine attitude and level of knowledge about the vaccine. The association between the idea of being vaccinated and demographic variables were examined with Pearson chi-square analysis and a significant relationship was found only in terms of age and marital status variables. Pearson's correlation analysis was used to determine the relationship between the vaccine attitude scores and the level of knowledge about the vaccine. It was concluded that the relationship between age and marital status with the idea of vaccination was statistically significant. (P<0,01) T-test was used to determine whether it differentiated according to chronic illness and it was determined that it did not. (P>0,05) One-way ANOVA was used for the relationship between fear level against Covid 19 and attitude towards a vaccine and it was observed that there was a significant difference. The effect of seeing social media and television as a source of information on the idea of vaccination was examined using Ordinal Logistics Regression according to the determined reference values and it was seen that there was a significant difference. Also, domestic vaccine positively affects the attitude towards a vaccine.Öğe Numerical Analysis of Geotechnical Seismic Isolation System for High-Rise Buildings(Malatya Turgut Özal Üniversitesi, 2021) Yıldız, ÖzgürSeismic isolation is a method of protecting buildings from earthquake-induced deformations by using isolators and devices under the superstructure. The purpose of the seismic isolation method is to reduce the earthquake forces transferred from the ground to the structure by placing energy-absorbing elements between the foundation and superstructure. Especially in developing countries, the "Geotechnical Seismic Isolation (GSI)" system has been proposed as an isolation method to reduce earthquake-induced damages on buildings. This study, it is aimed to reduce the effects of earthquakes in a multi-story building with an isolation layer formed by a rubbersand mixture (RSM). For this purpose, a 10-story reinforced concrete building was numerically modeled. Beneath the foundation of the building model, a seismic energy absorbent RSM layer was placed and its contact with the natural soil was interrupted by using geosynthetic liners. The model was subjected to the 1992 Erzincan (EW) Earthquake motion and its performance has been evaluated in terms of lateral displacements and accelerations. The numerical studies indicated a substantial improvement due to the use of the RSM layer. The accelerations measured by the superstructure decreased up to 48% by employing the isolation layer. The numerical analysis was carried out using the dynamic module of the PLAXIS 2D finite element analysis programÖğe A computational method based on interval length for fuzzy time series forecasting(2021) Akay, ÖzlemIn the literature, there have been a good many different forecasting methods related to forecasting problems of fuzzy time series. The main issue of fuzzy time series forecasting is the accuracy of the forecasted values. The forecasting accuracy rate is affected by the length of each interval in the universe of discourse. Thus, it is substantial to determine the length of each interval. In this study, a new computational method based on class width to determine interval length is proposed and also used the coefficient of variation for time series forecasting. After the intervals are formed, the historical time series data set is fuzzified according to fuzzy time series theory. The proposed model has been tested on the student enrollments, University of Alabama, and a real-life problem of rice production for containing higher uncertainty. This method was compared with existent methods to determine the effectiveness in terms of the mean square error (MSE) and the average forecasting (AFE). The results are shown that the proposed model can achieve a higher forecasting accuracy rate than the existing models.Öğe Determination of Breakfast Habits of Health School Students and the Factors Affecting Them: Bitlis Eren University Example(Malatya Turgut Özal Üniversitesi, 2021) Argun, Mustafa Şamil; Zanlıer, BetülIn this study, it was aimed to determine the breakfast habits of Health School students and the factors affecting them. The research was conducted with 120 students representing Bitlis Eren University Health School students. The questionnaire form was used as a data collection tool. As a result of the study, it was observed that 35.8% of the students had a regular breakfast every day, and 3.3% did not have breakfast. It was determined that 48.3% of the students who skipped breakfast skipped because of waking up late, 24.2% due to lack of appetite in the mornings, 10% because of not caring, 5% because of dislike to eat breakfast, 2.5% for economic insufficiency, and 2.5% for fear of gaining weight. They reported that the most common situations encountered by students when they did not eat breakfast were the feeling of hunger, weakness, fatigue, and decreased attention. The majority of the students think that breakfast enables a fresh start to the day, breakfast is the most important meal of the day and breakfast helps regulate blood sugar. It was observed that students whose fathers were public employees skip breakfast more (p <0.001). As the monthly income of the students' families increased, the rate of skipping breakfast increased (p <0.05). The effect of the smoking status on skipping breakfast was found to be significant (p <0.01).Öğe Obtaining activated-carbon from Zivzik (Siirt) pomegranate waste by chemical activation and model dye adsorption(Malatya Turgut Özal Üniversitesi, 2020) Kuyucu, Ali; Selçuk, Ahmet; Önal, YunusIn this study, activated carbon, obtained from Zivzik Pomegrate (Siirt-TURKEY), has been used as adsorbent matter. The activated-carbon has been prepared with chemical activation using ZnC12. BET surface area has been measured as 1513.05 m2 /g. Methylene Blue and Crystal Violet have been used as dyestuffs. It has been investigated the effect of initial pH, initial dye concentration and temperature on adsorption. Four different initials concentrations have been used for both dyestuffs. It has been observed that the initial pH does not affect the adsorption capacity. The compatibility with four different adsorption isotherms has been investigated and it is approved that it fits the Langmuir adsorption isotherm. For both dyes; RL value, which is the dimensionless separation factor found using KL value from Langmuir parameters, was found to be 0.001. This result shows that the adsorption process is efficient. Also, it was seen that the correlation factor R2 for both dyes calculated from the graph drawn according to the Langmuir isotherm has a high value such as 0,999. Three different kinetic models (the pseudo first order model, the pseudo second order model and the Elovich equation) have been investigated by doing experimental studies at three different temperatures with different initial concentrations. Correlation coefficient R2 is; for Methylene Blue 0.99 and for Crystal Violet 0.99. Since the qe values calculated with the experimental qe values are compatible with each other, it was observed that our study is more suitable for the Pseudo 2nd Order Kinetic model. The entropy (?S ?) values are 51.717 J/molK for Methylene Blue and 70.817 J/molK for Crystal Violet, respectively. The positive values of ?S ?reflect the affinity of adsorbent material towards Methylene Blue and Crystal Violet. In addition, it has been observed that adsorption is reversible and endothermicÖğe The Effect of Align Parameter on Scattering Parameter for Pseudomorphic High Electron Mobility Transistor(Malatya Turgut Özal Üniversitesi, 2020) Satılmış,GökhanIn this paper, various physical device simulation of pseudomorphic High Electron Mobility Transistors are realized to show the effect of aligning parameter on scattering parameters. S parameters are complex numbers, so both real and imaginer part of scattering parameters are plotted concerning frequency at different align parameters. In all figures, a brief explanation about the change of the S parameter for frequency and align parameter is provided. The effect of the align parameter, which has a value of 0.4 differs from other align parameter values such as 0.45, 0.5, 0.55 and 0.6 on scattering parameters of the transistor structure.Öğe Determination of Consumer Preferences for Goose Meat Using Conjoint Analysis(Malatya Turgut Özal Üniversitesi, 2020) Gündüz, SelimThis study examines the consumer preferences for goose meat purchases of consumers who had previously purchased goose meat. The main purpose of this study is to determine which factors are more important for consumers when purchasing goose meat. Accordingly, the conjoint analysis technique, which is one of the multivariate statistical analysis methods, is used to determine the factors affecting goose meat purchases and the reasons for preferring goose meat. According to data of the Turkish Statistical Institute (TURKSTAT) for 2019, 44.07% of the goose population of Turkey (1,157,049) spread among the provinces of Kars (27.26%), Ardahan (8.68%), and Mus (8.13%). A sample of 172 people was selected by using the convenience sampling technique, one of the non-probability sampling methods, among the people who lived or have been living in these provinces and consumed goose meat. Market research and a questionnaire, which was prepared to determine consumer preferences, were conducted on this sample. According to the results of the analysis, the most significant factor determining the consumer preference for goose meat was found to be the price of goose meat per kilo (37.3%). This was followed by the region where the goose was raised (32.8%), the place where the goose meat was sold (21.6%), and the presence of the product label (8.3%) with the identification information of the product. Considering the results of the data obtained from the study, it is thought that the market share of the goose meat will increase if its recognition is increased by applying a reasonable pricing strategy, and standardizing the quality of the product.Öğe Low Cost Activated Carbon Synthesis, Characterization and Adsorption Applications(Malatya Turgut Özal Üniversitesi, 2020) Küçük,İlhan; Önal,YunusIn this study, activated carbon was synthesis from peach kernel shells, which is agricultural waste. The synthesized activated carbons were characterized and their adsorption properties were examined. Activated carbons were synthesized by the physical activation method and CO2 was used as the activation gas. The synthesis was carried out in two steps. In the first step, it was subjected to the carbonization process at 4 different temperatures. During the carbonization process, two different gas flows were used. In the activation process, a temperature of 800°C was used. The surface area and morphological properties of the obtained activated carbons were studied by BET, XRD, FTIR and elemental analyzes. Methylene blue was used during adsorption. The adsorption capacities of the samples were calculated.Öğe Influence of a Clay Ground Stabilized with Blast Furnace Slag on Flexible Road Pavement Thickness and Cost(Malatya Turgut Özal Üniversitesi, 2020) Tanyıldızı,Mehmet MahmutIt has become a necessity in Highway Engineering, due to today's heavy vehicle traffic loads, that subgrade with poor bearing capacity on which the road will rest be improved with various methods and additives. In this study, it has been aimed to improve clay soil with poor bearing strength with the contribution of waste blast furnace slag (BFS) and to investigate its effect on the thickness and cost of flexible road pavement. This study aims to improve clay soil with poor bearing strength with the contribution of waste BFS. Moreover, it tries to investigate the effects of BFS on the thickness and cost of flexible road pavement. For this purpose, in the study, stabilized mixture samples were prepared by adding 5, 10, 15, 20% by weight of BFS to the clay soil. After these prepared samples have been mixed homogeneously, standard proctor, unconfined compression and California Bearing Ratio (CBR) tests were applied to the samples. As a result of experimental studies, it was observed that the increase in BFS resulted in a decrease in the maximum dry density of the samples and an increase in the optimum moisture content. Also, the highest unconfined compression strength was obtained from 20% of BFS added samples. CBR values of the samples tested at this rate increased by 8.71 times compared to pure clay soil. Using these experimental data, the flexible road pavement layer thicknesses to be constructed with the AASHTO 1993 method on the BFS added ground were calculated, and pavement cost analyzes were made considering current prices. As a result of the calculations, the design calculation was made according to the layer thicknesses determined for both soils. it was determined that adding 20% BFS to the soil decreased the road pavement layer thickness by 29.41% compared to the pure clay soil. The cost calculation results show that compared to the pure clay soil, there is about a 5.65% decrease in the pavement cost for clayey soils with 20% BFS. According to these results, when the subgrade of a 1000 m in length and 20 m in width road is improved with 20% BFS, 8.400,00 TL saving will be provided in the cost of flexible pavement
