İşletme Mühendisliği Bölümü Koleksiyonu

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    Article
    Effect of Heat Treatment on Magnetic Properties of Nanocomposite Nd-Lean Nd7Fe73b20 Ribbons
    (Springer, 2021) Caglar, Seyit; Kilicaslan, M. Fatih; Atasoy, Ahmet; Tiryaki, Hasan; Erkovan, Mustafa; Hong, Soon-jik
    In this work, we explored the effect of heat treatment on high boron and Nd-lean content magnetic Nd7Fe73B20 nanocomposite materials via vibration sample magnetometer (VSM), X-ray diffraction, differential thermal analysis (DTA), and scanning electron microscope (SEM). The Scherer formula was employed to estimate the effect in the crystal size of the heat treatment on high boron and Nd-lean content magnetic Nd7Fe73B20 nanocomposite materials. We heat-treated samples in different conditions to obtain optimum magnetic properties. Our high-throughput fabrication strategy allows us to elucidate the possibility of obtaining Nd-lean nanocomposite NdFeB magnet in terms of the melt-spinning. We evaluated the influence of heat treatment on the Nd-lean NdFeB/alpha-Fe nanocomposite magnets produced by melt-spinning. Here, in the heat-treated ribbon at 750 degrees C for 30 min, we obtained a combination of coercivity of 450 Oe, a high-saturation magnetization of 232 emu/g in the heat-treated ribbon at 650 degrees C for 30 min, which surpasses most traditional nanocrystalline magnets based on Fe-Co and pricey. The results we present here are expected to serve as a guideline for designing new magnets for industrial applications.
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    Book Part
    The Marketization of Higher Education in Turkey (2002-2011)
    (Palgrave, 2012) Onal, Nevzat Evrim
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    Article
    Sustaınabılıty In Agrıculture And Alıenatıon In Peasantry: Arguments Derıved From the Case of Turkey
    (2018) Önal, Nevzat Evrim; Özalp, Burhan
    Industrial agriculture, unlike traditional agriculture, relies solely on high yield and profit. All the problems attributed to it are directly or indirectly linked to this single-purpose nature. However, the industrialization of agriculture does not proceed only in large holdings belonging the rich farmers: The small holdings, under a multilayered pressure exerted by large scale capital dominating the input, output and credit markets, also resort to these production methods. This creates a vicious circle through which small-scale producers, due to increasing costs, price volatilities and indebtedness, gradually lose control of their economic activity. Peasants under this pressure have to use industrial, even prohibited inputs, knowing very well the harm they cause to the environment and consumers. Additionally, they are perfectly aware that the capital holders controlling the input-output and credit markets gain profit by appropriating their labor through price mechanisms. Under these contradictory conditions, agricultural production loses all the traditional meaning attributed to it for the peasant. The peasant is thus alienated from his produce in a way that is similar (but not exactly the same) to worker’s alienation to his labor power. This study investigates the example provided by Çukurova Region in Turkey to present arguments on the link between sustainability (or the lack thereof) and peasant alienation.
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    Article
    Wear Performance of Ductile Iron After Electrolytic Plasma Hardening
    (Redakcia Kovove Materialy, 2019) Ayday, A.; Durman, M.
    This study aimed to improve the tribological behavior of electrolytic plasma treated (EPT) ductile iron (DI). For this purpose, ductile iron was electrolytic plasma hardened under different processing parameters (treatment time and thermal cycle). Three different types of specimens were tested: untreated DI, electrolytic plasma hardened DI and remelted DI by two type wear test. It was found that remelted DI performed much better concerning wear resistance than the other samples. The microstructure of the hardened specimens was investigated using optical microscopy. Microhardness profiles and surface hardness were investigated via the Rockwell test. The microstructure and hardness of the EPT hardened layer were dependent on the processing parameters, with the hardness values reaching the range 880-1080 +/- 10 HV0.2.