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Vijay Mandal,Shashank Sharma,Sudhanshu S. Singh,J. Ramkumar 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.1
Laser surface texturing can improve the surface properties of the metallic components. In this work, surface texturing hasbeen carried in a powder bed fusion of Inconel 718 (IN718) rather than material removal process. A 2D fnite element method(FEM) has been built to simulate the thermo-fuidic dynamics of surface texturing, incorporating the phase-feld method inthe preplaced IN718 powder. The temperature and induced velocity felds have been predicted using transient heat transferand fuid fow based on the conservation of mass, momentum, and energy in the melt pool. Furthermore, the roles of drivingforces such as Marangoni force, recoil pressure, and thermal buoyancy force on the melt pool behavior have been evaluated. Micro-textures were developed using laser on the powder bed by using diferent scanning patterns, such as line, circle, hatchand convex dimple. The efect of process parameters (pitch distance, number of pulses and number of layers) on the surfacehydrophobicity were evaluated by measuring the contact angle, where the convex dimple texture exhibited the maximumcontact angle. The hydrophobicity was afected by the ripples (2nd level of roughness) on the surface, which increased withan increase in number of pulses.
( Vijay Gayam ),( Muhammad Rajib Hossain ),( Mazin Khalid ),( Sandipan Chakaraborty ),( Osama Mukhtar ),( Sumit Dahal ),( Amrendra Kumar Mandal ),( Arshpal Gill ),( Pavani Garlapati ),( Sreedevi Ramak 대한소화기학회 2018 Gut and Liver Vol.12 No.6
Background/Aims: Limited data exist comparing the safety and efficacy of direct-acting antivirals (DAAs) in hepatitis C virus (HCV) monoinfected and HCV/human immunodeficiency virus (HIV) coinfected patients in the real-world clinic practice setting. Methods: All HCV monoinfected and HCV/HIV coinfected patients treated with DAAs between January 2014 and October 2017 in community clinic settings were retrospectively analyzed. Pretreatment baseline patient characteristics, treatment efficacy, factors affecting sustained virologic response at 12 weeks (SVR12) after treatment, and adverse reactions were compared between the groups. Results: A total of 327 patients were included in the study, of which 253 were HCV monoinfected, and 74 were HCV/HIV coinfected. There was a statistically significant difference observed in SVR12 when comparing HCV monoinfection and HCV/HIV coinfection (94% and 84%, respectively, p=0.005). However, there were no significant factors identified as a predictor of a reduced response. The most common adverse effect was fatigue (27%). No significant drug interaction was observed between DAA and antiretroviral therapy. None of the patients discontinued the treatment due to adverse events. Conclusions: In a real-world setting, DAA regimens have lower SVR12 in HCV/HIV coinfection than in HCV monoinfection. Further studies involving a higher number of HCV/HIV coinfected patients are needed to identify real predictors of a reduced response. (Gut Liver 2018;12:694-703)