Mühendislik Fakültesi, Makine Mühendisliği Bölümü,Diğer Yayınlar Koleksiyonu
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Öğe An overview of deformation path shapes on equal channel angular pressing(MDPI, 2022) Baysal, Erhan; Koçar, Oğuz; Kocaman, Engin; Köklü, UğurIn recent years, research on ultra-fine grain materials has gained attention. While attempts have been made to improve the properties of the material, it has also become increasingly important to decrease the costs. Studies on improving material properties have revealed new production methods or have required the revision of existing production methods. In this direction, severe plastic deformation methods have come to the fore as a good alternative, and by improving the methods with new variations, materials with grain sizes below 1 mu m have been obtained. In addition, this method positively affects the mechanical properties of the material. In this study, the Equal Channel Angular Pressing (ECAP) method, one of the severe plastic deformation methods, which has attracted great attention among researchers, was examined and the development stages of the method were investigated according to recent studies. The effective parameters in the method were examined and the effects of these parameters on the grain structure and mechanical properties of the material were discussed. Channel shapes, which are open to innovation and increase the efficiency of the ECAP method, were kept in the foreground among the prominent parameters in the ECAP process, and the results of the design changes made with new variations were examined.Öğe Letter to the editor(Taylor & Francis, 2020) Ünal, MustafaI read with great interest the recent article entitled “Raman spectroscopy investigation shows that mineral maturity is greater in CD-1 than in C57BL/6 mice distal femurs after sexual maturity“ written by Fayolle et al. 1 , investigating the differences in Raman spectroscopic compositional properties of the distal femur bone tissue between CD-1 and C57BL/6 mice that are the two most common mouse strains used in pre-clinical studies. First of all, I would like to congratulate the authors for this study which potentially contributes to ongoing research concerning bone matrix compositional differences among mouse strainsÖğe Effects of Different Binding Materials on The Properties Of Biofuel Pellets Produced From Mdf and Pine Wood Sawdust Waste(Univ Minho, 2015) Köse, Faruk; Kaya, Mehmet Numan; Aksoy, Muharrem Hilmi; Tuplek, Ali; Ferreira, P; Soares, IImportance of biofuels has increased in recent years in Turkey as well as in the World. Million tones of biomaterials such as wood are used in woody industries and significant amount of wood waste is obtained. It is possible to make use of wood waste as fuel by pelletizing them. In this study, samples of pine wood sawdust (PWS) and medium density fiber (MDF) sawdust pellets have been obtained. After carrying out chemical analyses on these samples; the ratio of volatile matter, upper calorific value, lower calorific value, ash, total humidity rate and sulfur rates have been identified. The emission values of the exhaust gases (CO, CO2, SO2, NO, NOx) forming as a result of the combustion process of pellet samples in laboratory conditions have been measured. The effects of addition of zeolite, cane molasses (CM), starch in pellet samples on the emission values have been studied. In addition, in order to identify the combustion velocities of the pellet samples, a fixed-bed experimental singeing machine has been devised. As a conclusion, PWS pellet has been found to be a cleaner and more efficient alternative to coal of lignite type. The calorific value of MDF dust pellet samples has reached a value of 3.857 cal/gr as a result of the fire retardant materials in it. The lowest emission values have been observed in PWS pellets which contains 9% zeolite as a binding material. It has been found out that PWS burning with zeolite reduces the combustion velocity and thus increasing the efficiency and also reducing the stack gas emission.
