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Öğe DETERMINING THE ELASTIC PROPERTIES OF EPOXY/SEMICONDUCTIVE GLASS COMPOSITES BY ULTRASONIC METHOD(AMER INST PHYSICS, 2014) Oral, Imran; Soydal, UlkuThe purpose of this study is to investigate the effects of the type and amount of semiconductive fillers on the elastic properties of epoxy (ER) / semiconductive glass (SG) composites by ultrasonic velocity measurments. Different semiconducting glasses (SG) binary systems such as As2S3-TlS and As2Se3-TlS were synthesized. ER/SG composites were formed 15 wt. % of fillers and characterized by ultrasonic velocity measurments. The ultrasonic wave velocities of composites were measured with the pulse-echo method at room temperature by a flaw detector. The values of the acoustic impedance, Poisson's ratio, and elasticity constants of the samples were calculated by the measured values of both longitudinal and shear ultrasonic wave velocities. According to the results, The highest elastic properties values were found in the ER/SG-3 composite using 50% As2Se3-50% TlS.Öğe Determining the Elastic Properties of Modified Polystyrenes by Sound Velocity Measurements(WILEY, 2011) Oral, Imran; Guzel, Hatice; Ahmetli, Gulnare; Gur, C. HakanThe effect of the binding of various polyfunctional groups to polystyrene's (PS's) aromatic ring on the elastic properties of the PS were investigated by an ultrasonic method. Various sets of samples were prepared by chemical modification of pure PSs having different molecular weights with SA, maleic anhydride, and phthalic anhydride. The ultrasonic wave velocities of modified PSs were measured with the pulse-echo method at room temperature by a computer-controlled analyzer and a digital oscilloscope. The values of the acoustic impedance, Poisson's ratio, and elasticity constants of the samples were calculated by the measured values of the densities and sound velocities. The longitudinal and shear wave velocities and the values of all elastic constants increased with chemical modification of the pure PS. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 121: 3425-3432, 2011Öğe Determining the mechanical properties of epoxy resin (DGEBA) composites by ultrasonic velocity measurement(WILEY, 2013) Oral, Imran; Guzel, Hatice; Ahmetli, GulnareIn this study, the composites of diglycidyl ether of bisphenol A (DGEBA) epoxy resin that have been formed by mixing epoxy resin with allyl glycidyl ether (AGE) and 2,3-epoxypropyl methacrylate [glycidyl methacrylate (GMA)] were prepared in weight % ratios of 90 : 10, 80 : 20, and 70 : 30. A computer controlled analyzer with 35 MHz and a digital oscilloscope with 60 MHz were used for measuring the velocities of ultrasonic wave. The measurement of ultrasonic velocity carried out by pulse echo method at frequencies of 2.25 and 3.5 MHz at room temperature. The values of acoustic impedance (Z), Poisson ratio (mu), and coefficients of elasticity (L, G, K, E) of composites were calculated by values of densities and velocities that obtained. Thus, the effect of modificating epoxy resin (DGEBA) by AGE and GMA on mechanical properties of DGEBA was investigated using the ultrasonic method. Atomic force microscopy has been used for determining the microstructure of composites. By the results obtained from the investigation, it have been established that the longitudinal and shear ultrasonic wave velocities, and the values of all the elasticity constants of DGEBA were increased by modification with AGE and GMA. Also the most suitable combination ratio for the compound of DGEBA : AGE and DGEBA : GMA has been found as 80 : 20. (c) 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 127: 1667-1675, 2013Öğe The investigation of physics pre-service teachers' social learning styles in terms of various variables(SILA SCIENCE, 2012) Berber, Nilufer Cerit; Oral, ImranA very comprehensive and comparative review of many classical and contemporary models and theories of learning styles is available in. The purpose of this study is to determine learning styles of physics pre service teachers and to investigate relation of their learning styles with their gender, their level of grade, place of staying and their success. For determining learning styles of physics pre service teachers, Grasha and Riechmann's "Learning Style Inventory" was used. This study was carried out with 136 physics pre service teachers from the Physics Department of Ahmet Kelesoglu Education Faculty at Selcuk University in the first term of 2009-2010 Academic Year in Turkey. The chi 2 (Chi-square), frequency, mean and percentage were used for testing the data obtained from the study. It was found that the value of competitive and participant learning styles of female pre service teachers were higher than male preservice teachers.Öğe Measuring the Young's modulus of polystyrene-based composites by tensile test and pulse-echo method(SPRINGER, 2011) Oral, Imran; Guzel, Hatice; Ahmetli, GulnareIn this study, the pure polystyrenes (PS) with different molecular weights (3.5 x 10(5) and 5.0 x 10(5)) have been modified by the chemical modification with succinic anhydride (SA), maleic anhydride (MA), and phthalic anhydride (PhA). The modified polystyrenes (MPS) have been mixed with the pure PS with the molecular weight of 2.3 x 10(5) in weight % ratio 90:10, 80:20, and 70:30. Young's modulus of obtained composites has been measured mechanically by the tensile test and ultrasonic method at frequency of 5 MHz. Further, the values of Young's modulus measured by both methods have been compared with each other. From the results, a significant difference has not been found between the values of Young's modulus of both methods. As a result it can be stated that measuring the Young's modulus of these materials by the ultrasonic methods is more sensitive and economical than the mechanical methods.Öğe A study on the effect of multiple intelligences theory upon the success level of genders(AMER INST PHYSICS, 2007) Oral, ImranIn this study, the effects of Multiple Intelligences theory upon the success level of genders were investigated at three high schools in Konya. In conclusion, a significant difference has not been found between groups for multiple intelligences and groups for pre-tests. In general, the female student groups were more successful than the male student groups regarding post-test. However, this result did not cause a significant difference between the groups.Öğe Ultrasonic Characterisation of Epoxy Resin/Polyethylene Terephthalate (PET) Char Powder Composites(KAUNAS UNIV TECH, 2016) Oral, Imran; Ahmetli, GulnareThis study is carried out in order to determine the elastic properties of the Epoxy Resin (ER) / Polyethylene terephthalate (PET) Char Powder Composites by ultrasonic wave velocity measurement method. Plastic waste was recycled as raw material for the preparation of epoxy composite materials. The supplied chars were mixed with epoxy resin matrix at weight percentages of 10 %, 20 % and 30 % for preparing ER/PET Char Powder (PCP) composites. The effect of PET char powder on the elastic properties of ER/PCP composites were investigated by ultrasonic pulse-echo method. According to the obtained results, the composition ratio of 80: 20 is the most appropriate composition ratio, which gave the highest elastic constants values for ER/PCP composites. On the other hand, the best electrical conductivity value was obtained for 70: 30 composition ratio. It was observed that ultrasonic shear wave velocity correlated more perfectly than any other parameters with hardness.Öğe Ultrasonic characterization of andesite waste-reinforced composites(SPRINGER, 2017) Oral, Imran; Soydal, Ulku; Bentahar, MouradThe epoxy resin used in this study is modified with 5 wt% of polyaniline. Then electrically conductive modified epoxy resin (MER) (as matrix) and different weight amounts (10-30 wt%) of andesite waste (AW) as filler are mixed together to obtain the andesite waste-reinforced epoxy resin composites. The effects of filler amount on the electrical and ultrasonic properties of the modified epoxy resin are examined. The effects of AW amount on the ultrasonic properties of the obtained MER/AW composites are investigated by ultrasonic pulse-echo method. The conductivity of the composites is measured by a four-point probe (FPP) method, and the morphologies of the samples are investigated by scanning electron microscopy (SEM). Experimental results show that increasing the amount of AW causes a linear increase in the elastic properties. On the other hand, the same amounts of AW decrease the electrical conductivity of MER.
