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Optical and Microstructural Characterisations of Pulsed rf Magnetron Sputtered Alumina Thin Film

Journal of Materials Science & Technology 2013年第10期29卷 929-936页

作者： I.neelakanta Reddy V.Rajagopal Reddy n.sridhara S.Basavaraja A.K.Sharma Arjun Dey Thermal Systems Group ISRO Satellite CentreVimanapura Post Department of Physics Sri Venkateswara University Bruker India nanotechnology Laboratory Jawaharlal Nehru Centre for Advanced Scientifc Research (JNCASR)

Alumina thin films were deposited on fused quartz and SS304 substrate by pulsed rf magnetron sputtering with both direct and reactive methods. The films were characterised by energy dispersive X-ray spectroscopy, X-ray diffraction, scanning electron microscopy, field emission scanning electron microscopy and atomic force microscopy to reveal the microstructure, surface morphology and topography of thin films. Transmittance and reflectance of alumina thin film were evaluated after deposition on the quartz substrate. Transmittance of the quartz remains almost un-altered when alumina was deposited by the reactive sputtering. A marginal decrease of ~4% in the transmittance of quartz was, however, observed after deposition of alumina by direct sputtering. Infrared emittance of the substrate also remains almost constant after deposition of thin alumina film. Further, as-deposited alumina on SS304 obtained by both direct and reactive sputtering process was amorphous in nature. However, after annealing crystalline peaks were observed.

关键词： Alumina Thin film rf magnetron sputtering Microstructure Transmittance Reflectance Infrared emissivity

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Superior safety of direct oral anticoagulants compared to Warfarin in patients with atrial fibrillation and underlying cancer: a national veterans affairs database study

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Journal of Geriatric Cardiology 2019年第9期16卷 706-709页

作者： Abhishek C Sawant Arnav Kumar Wilmon Mccray Sheldon Tetewsky Linda Parone Srilekha sridhara Meghana Prakash Hiriyur Prakash Gary Tse Tong LIU nidhi Kanwar Aishwarya Bhardwaj Sahoor Khan Christopher Manion Ankush Lahoti Ashish Pershad Peter Elkin John Corbelli Banner University Medical Center Phoenix Arizona USA Andreas Gruentzig Cardiovascular Center Emory University School of Medicine Cardiovascular Medicine Atlanta GA USA Western new York Healthcare System Buffalo VA Medical Center Buffalo NY USA Department of Medicine and Therapeutics Faculty of Medicine Chinese University of Hong Kong Hong Kong SAR China Tianjin Key Laboratory of Ionic-Molecular Function of Cardiovascular disease Department of Cardiology Tianjin Institute of Cardiology Second Hospital of Tianjin Medical University Tianjin China

Background Studies evaluating safety of warfarin and direct oral anticoagulants(DOACs) for prevention of stroke in patients with atrial fibrillation(AF) are lacking. Methods & Results All patients(n = 196,521) receiving care at veteran’s affairs with active cancer and AF from 2010–2015 were included. One-year mortality was significantly higher in unadjusted analysis with warfarin(44.9%) compared to dabigatran(25%, P n(24.4%, P nd apixaban(30%, P nd after adjusting for age, sex and type of cancer mortality(OR = 2.66, 95% CI: 2.52–2.82, P nificantly higher among patients receiving warfarin(1.2%) compared to patients receiving dabigatran(0.5%), rivaroxaban(0.7%) and apixaban(0.8%) respectively, P = 0.04. Conclusions We demonstrated the superior safety profile of DOACs compared to warfarin among patients with underlying cancer and AF. Warfarin was associated with higher mortality, similar ischemic stroke risk but higher risk of hemorrhagic stroke.

关键词： Atrial fibrillation Cancer Oral anticoagulation

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