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- 저자 : Doğan Şimşek (검색결과 2 건)
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Haktan Sıralı,Doğan Şimşek,Dursun Özyürek 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10
In this study, changes in microstructure, hardness and wear performance of titanium–zirconium–molybdenum (TZM) alloysproduced by mechanical alloying method with the addition of different amounts of titanium (Ti) were investigated. Mechanicallyalloyed powders were sintered at 1300 °C for 4 h under 10–6 mbar vacuum environment. The produced alloys werecharacterized by scanning electron microscope (SEM + EDS), X-ray diffraction, grain size distribution, hardness and densitymeasurements. In the wear tests, three different loads and five different sliding distances were used. Results showed that theproduced TZM alloys were porous, and the pores in the alloys containing 0.40% and 0.45% Ti were generally located onthe grain boundaries. In alloys containing 0.50% Ti, inside the grain the pore sizes increase, while in the alloy containing0.55% Ti, the pore sizes in grain boundary decrease. Grain size distribution results show that as the Ti content increased, theamount of grain size over 6 μm decreased and smaller than 6 μm increased. Hardness and density results show that whilethe hardness of TZM alloys produced increases depending on Ti content, their density decreases. The highest hardness wasobtained in the TZM alloy containing 0.55% Ti, while the lowest density was obtained in the same alloy. Wear test resultsshow that the lowest weight loss was obtained in TZM alloy containing the highest amount of Ti (0.55%) under all loads.
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Özlem Akgün Doğan,Pelin Özlem Şimşek Kiper,Gülen Eda Utine,Mehmet Alikaşifoğlu,Koray Boduroğlu 대한가정의학회 2017 Korean Journal of Family Medicine Vol.38 No.2
Williams syndrome (OMIM #194050) is a rare, well-recognized, multisystemic genetic condition affecting approxi-mately 1/7,500 individuals. There are no marked regional differences in the incidence of Williams syndrome. The syndrome is caused by a hemizygous deletion of approximately 28 genes, including ELN on chromosome 7q11.2. Prenatal-onset growth retardation, distinct facial appearance, cardiovascular abnormalities, and unique hyperso-cial behavior are among the most common clinical features. Here, we report the case of a patient referred to us with distinct facial features and intellectual disability, who was diagnosed with Williams syndrome at the age of 37 years. Our aim is to increase awareness regarding the diagnostic features and complications of this recognizable syn-drome among adult health care providers. Williams syndrome is usually diagnosed during infancy or childhood, but in the absence of classical findings, such as cardiovascular anomalies, hypercalcemia, and cognitive impair-ment, the diagnosis could be delayed. Due to the multisystemic and progressive nature of the syndrome, accurate diagnosis is critical for appropriate care and screening for the associated morbidities that may affect the patient’s health and well-being.
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