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    Öğe
    Experimental evaluation of performance for micro wind turbines by using permanent magnets
    (Kırıkkale Üniversitesi, 2018) Ari, Murat; Mamur, Hayati
    Permanentmagnet synchronous generators with interior rotor (IR-PMSGs) have been widelypreferred in micro wind turbines (MWTs). Customers demand high output power ofthe MWTs. Therefore, in this study, performance analyses and optimizations oftwo IR-PMSG rotors were practically carried out to increase the output power ofthe MWTs by employing N35 and N42 Neodymium-Iron-Boron (NdFeB) permanentmagnets (PMs) with same geometry used on IR-PMSG rotor surfaces. For thispurpose, two IR-PMSG rotors were designed with same geometry and applied to apole shifting reduction technique to decrease their cogging torque on theIR-PMSGs as well. According to the obtained results, comparing the performancesof the IR-PMSGs with both N35 and N42 NdFeB PMs on a MWT with regards to theirpower coefficients, an increase of 18.6% in power coefficient of the IR-PMSGwith N42 NdFeB PMs was calculated.
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    Öğe
    Mid-term results in the treatment of varicose veins with N-butyl cyanoacrylate
    (Sage Publications Inc, 2017) Eroglu, Erdinc; Yasim, Alptekin; Ari, Murat; Ekerbicer, Hasan; Kocarslan, Aydemir; Kabalci, Mehmet; Acipayam, Mehmet
    Aim To present mid-term results of patients with varicose veins treated with N-butyl cyanoacrylate (VariClose (R)), a nontumescent endovenous ablation technique. Patients and method Endovenous ablation was performed on 180 patients with saphenous vein incompetence between May and October 2014. One hundred sixty-eight subjects capable of being followed-up for 30 months were included. Patients' pre- and postoperative data were recorded. Results Procedures were performed on the great saphenous vein in 159 patients and on the small saphenous vein in nine patients. Saphenous vein diameters ranged between 5.5mm and 14mm. Full ablation was achieved in all patients following the procedure. No complications were encountered. Patients were monitored for 30 months. Ablation rates were 100% at the 3(rd) month, 98.3% at the 6(th) month, 96.6% at 1 year, and 94.1% at 30 months. Mean venous clinical severity score was 10.2 before procedures, decreasing to 3.9 at 3 months, 4.2 at 6 months, 2.9 at 12 months, and 2.7 at 30 months (p=0.000). Conclusion Due to its high success rate, absence of complications, no tumescent anesthesia requirement and high patient satisfaction, endovenous ablation with N-butyl cyanoacrylate is a good method. However, long-term follow-up results are now needed.