İşletme Mühendisliği Bölümü Koleksiyonuhttps://hdl.handle.net/20.500.12879/702024-03-28T15:31:37Z2024-03-28T15:31:37ZWear performance of ductile iron after electrolytic plasma hardeningAyday, A.Durman, Mehmethttps://hdl.handle.net/20.500.12879/1152021-04-12T12:53:59Z2019-01-01T00:00:00ZWear performance of ductile iron after electrolytic plasma hardening
Ayday, A.; Durman, Mehmet
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.
WOS:000457850700003
2019-01-01T00:00:00ZEffect of heat treatment on magnetic properties of nanocomposite Nd-lean Nd7Fe73B20 ribbonsCaglar, SeyitKilicaslan, M. FatihAtasoy, AhmetTiryaki, HasanErkovan, MustafaHong, Soon-jikhttps://hdl.handle.net/20.500.12879/1052021-03-23T10:55:55Z2021-01-01T00:00:00ZEffect of heat treatment on magnetic properties of nanocomposite Nd-lean Nd7Fe73B20 ribbons
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.
Tiryaki, Hasan/0000-0001-9175-0269; CAGLAR, SEYIT/0000-0002-0701-3029; WOS:000604333400012
2021-01-01T00:00:00ZThe Marketization of Higher Education in Turkey (2002-2011)Onal, Nevzat Evrimhttps://hdl.handle.net/20.500.12879/982021-03-25T12:15:31Z2012-01-01T00:00:00ZThe Marketization of Higher Education in Turkey (2002-2011)
Onal, Nevzat Evrim
[No Abstract Available]
WOS:000319994100012
2012-01-01T00:00:00ZMarx’ın Üretken ve Üretken Olmayan Emek Ayrımının Beyaz Yakalı Emeğin Kategorileştirilmesinde ÖnemiÖnal, Nevzat Evrimhttps://hdl.handle.net/20.500.12879/372021-04-01T08:47:47Z2019-01-01T00:00:00ZMarx’ın Üretken ve Üretken Olmayan Emek Ayrımının Beyaz Yakalı Emeğin Kategorileştirilmesinde Önemi
Önal, Nevzat Evrim
Kapitalist üretim biçimi dahilinde, sermayenin yeninde üretim döngüsü içerisinde rol üstlenen emeğin analizi, bu analiz zorunlu olarak politik sonuçlara da sahip olacağı için daima sorunlu bir mesele olagelmiştir. Neoliberalizmle birlikte toplam sermaye birikimi içerisinde ticari ve finansal sermayenin; buna paralel olarak işçi sınıfı içerisinde de beyaz yakalı kesimin ağırlığının artması, bir kez daha tartışmayı alevlendirmiş; kafa ve kol emeği ayrımı sermaye birikim sürecinde zorunlu bir işbölümüne işaret etmekten ziyade işçi sınıfı içerisinde müstakil bölmeler tanımlamak, hatta beyaz yakalı bölmeyi işçi sınıfının dışına çıkartmak için kullanılır olmuştur. Öte yandan, ortada incelenmesi ve teorize edilmesi gereken bir fenomen olduğu açıktır. Bu çalışma, beyaz yakalı işlerde istihdam edilen emek gücünün halen sağlıklı biçimde kategorize edilememiş olduğu değerlendirmesinden yola çıkarak, klasik politik iktisat ekolü tarafından ortaya atılan ve en gelişkin haline Marx’ın bu ekole yönelik eleştirisinde ulaşan “üretken emek” ve “üretken olmayan emek” kavramsallaştırmasının bu sorunsal açısından kafa ve kol emeği ayrımından çok daha sağlıklı bir araç olduğunu savunmaktadır ve bu yönde bir uygulama denemesidir.; The analysis of labor taking role in the reproduction process of capital within the capitalist mode of production has always been a problematic issue since this analysis cannot refrain from having political outcomes. This discussion once more became heated as the weight of commercial and financial capital within the total capital accumulation and the weight of white-collared workers in the working class became more pronounced with the rise of neoliberalism. Within this discussion, the distinction between manual and intellectual labor have come to be used frequently to define distinct, self-contained divisions within the working class, and in some cases even separate completely the white-collared section from the working class, instead of pointing to a necessary division of labor in the process of capital accumulation. On the other hand, it is obvious that the phenomenon at hand requires investigation and theorization. This article, departing from the assessment that the labor power employed in white-collared jobs is yet to be adequately categorized, claims that the conceptualization of “productive labor” and “unproductive labor” that was put forth by the classical political economy school and took its most sophisticated form in Marx’s critique of it provides a much sounder tool for this problematic than the distinction between manual and non-manual labor; and is an attempt at facilitating it as such.
2019-01-01T00:00:00Z