Browsing by Author "Cavdar U."

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    Magnetic-Thermal Analysis and Rapid Consolidation of FE–3 wt.% CU Powder Metal Compacts Sintered by Medium-Frequency Induction-Heated System
    (Springer Science and Business Media, LLC, 2014) Cavdar U.; Atik E.; Akgul M.B.
    In this paper, the results of numerical and experimental studies concerning the effect of mediumfrequency induction sintering of Fe–3 wt.% Cu powder metal (PM) compacts are discussed. Several sintering durations from 30 to 180 sec are studied. The mixed powders are compacted at 600 MPa and sintered by medium-frequency induction system (30–50 kHz frequency and 12 kW power). Magnetic and thermal analysis, mechanical properties, and densities of copper–iron PM compacts are presented. © 2014, Springer Science+Business Media New York.
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    Comparison of electrical energy consumption for different material processing procedures
    (Carl Hanser Verlag, 2016) Gokozan H.; Tastan M.; Taskin S.; Cavdar P.S.; Cavdar U.
    The aim of this study is to investigate the electrical energy consumption for different material processing methods. In these experiments, ferrous powder metals, bulk iron and bulk graphite materials are used. These different materials are heated, sintered and welded by using processes of ultra-high frequency induction heating (UHFIH), ultra-high frequency induction heating sintering (UHFIHS) and ultra-high frequency induction heating welding (UHFIHW), respectively. For all experiments, 2.8 kW, 900 kHz ultra-high frequency induction heating system is used. The experiments are conducted by LabVIEWTM based measurement and control system. Finally, all data are analyzed to show the energy efficiency of each process. © Carl Hanser Verlag GmbH &Co. KG.
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    A subset of patients with acquired partial lipodystrophy developing severe metabolic abnormalities
    (Taylor and Francis Ltd, 2019) Ozgen Saydam B.; Sonmez M.; Simsir I.Y.; Erturk M.S.; Kulaksizoglu M.; Arkan T.; Hekimsoy Z.; Cavdar U.; Akinci G.; Demir T.; Altay C.T.; Mihci E.; Secil M.; Akinci B.
    Purpose/Aim of the study: Acquired partial lipodystrophy (APL) is a rare disease characterized by selective loss of adipose tissue. In this study, we aimed to present a subset of patients with APL, who developed severe metabolic abnormalities, from our national lipodystrophy registry. Materials and Methods: Severe metabolic abnormalities were defined as: poorly controlled diabetes (HbA1c above 7% despite treatment with insulin more than 1 unit/kg/day combined with oral antidiabetics), severe hypertriglyceridemia (triglycerides above 500 mg/dL despite treatment with lipid-lowering drugs), episodes of acute pancreatitis, or severe hepatic involvement (biopsy-proven non-alcoholic steatohepatitis (NASH)). Results: Among 140 patients with all forms of lipodystrophy (28 with APL), we identified 6 APL patients with severe metabolic abnormalities. The geometric mean for age was 37 years (range: 27–50 years; 4 females and 2 males). Five patients had poorly controlled diabetes despite treatment with high-dose insulin combined with oral antidiabetics. Severe hypertriglyceridemia developed in five patients, of those three experienced episodes of acute pancreatitis. Although all six patients had hepatic steatosis at various levels on imaging studies, NASH was proven in two patients on liver biopsy. Our data suggested that APL patients with severe metabolic abnormalities had a more advanced fat loss and longer disease duration. Conclusions: We suggest that these patients represent a potential subgroup of APL who may benefit from metreleptin or investigational therapies as standard treatment strategies fail to achieve a good metabolic control. © 2018, © 2018 Taylor & Francis.