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Fabrication and Characterisation of Rutile-TiO_2 Coatings on Metallic Alloy Substrates

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材料热处理学报 2004年第5B期25卷 862-865页

作者： D. siva rama krishna School of Materials Engineering Nanyang Technological University Singapore 639798

In the present work, attempts have been made to extend the use of the tribological and chemical properties of rutile-TiO2 to metallic alloy systems, by forming a rutile coating on the metallic substrates. Two metallic alloys were selected in this study, including AISI316L austenitic stainless steel and aluminium alloy. The rutile-based coatings were fabricated by magnetron sputter deposition of a pure titanium coating first, and then thermal oxidation of the coated specimens to partially convert the titanium coating to rutile oxide and to promote interfacial reactions which can significantly enhance the coating-substrate adhesion strength. The structures and properties of the coating-substrate systems were characterized by a variety of analytical and experimental techniques, including X-ray diffraction, glow discharge spectrometry, high resolution SEM, nanoindentation, microscratch, friction and wear testing, as well as electrochemical testing. The results show that the friction and wear properties, as well as the corrosion resistance of the metallic alloys can be significant enhanced by surface engineering with rutile-TiO2.

关键词：金红石二氧化钛不锈钢磨损性能耐蚀性

Tribological Properties of A356.2/RHA Composites

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Journal of Materials Science & Technology 2012年第4期28卷 367-372页

作者： D. siva Prasad A. rama krishna Department of Mechanical Engineering GITAM University Visakhapatnam Andhra Pradesh India Department of Mechanical Engineering ANDHRA University Visakhapatnam Andhra Pradesh India

Rice husk ash （RHA） is one of the industrial waste byproduct available abundantly in the world. In the present work, an attempt is made to incorporate the RHA particles in the molten aluminum A356,2 alloy. The RHA particles were added into the matrix melt by creating a vortex with the help of a mechanical stirrer and the melt temperature was maintained between 800 and 850 ℃. Dry sliding wear experiments were performed in a pin on disc wear equipment against a chromium steel disc at 30 ℃. Scanning electron microscopy is used to study the wear characteristics of the unreinforced AI alloy and the A356.2/RHA composites. From the experiments it is observed that the composites exhibit higher hardness and resistance to wear as compared to unreinforced AI alloy,

关键词： Rice husk ash A356.2 Aluminum alloy Wear

Improving Performance of a Distributed File System Using a Speculative Semantics-Based Algorithm

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Tsinghua Science and Technology 2015年第6期20卷 583-593页

作者： Talluri Lakshmi siva rama krishna Thirumalaisamy Ragunathan Sudheer Kumar Battula K L University Andhra PradeshIndia and Research ScholarJawaharlal Nehru Institute of Advanced Studies (JNIAS) ACE Engineering College

File-sharing semantics is used by the file systems for sharing data among concurrent client processes in a consistent manner. Session semantics is a widely used file-sharing semantics in Distributed File Systems(DFSs). The main disadvantage of session semantics is that writes to an open file are visible to the concurrent client processes only during their next session. Recently, "linearizability semantics" was introduced in Blob Seer DFS, in which a Read Client Process(RCP) can read only a previous version of a binary large object(blob), while update operations are carried out on that blob in a concurrent manner. In this paper, we propose a new type of file-sharing semantics, namely "speculative semantics", which permits writes to an open file to be visible to other concurrent processes provided that data consistency is not affected. In addition, we propose a new read algorithm for DFSs based on speculative semantics and a new performance measurement metric called Currency. The experimental results obtained using Blob Seer DFS indicate that the proposed read algorithm performs better than the existing read algorithm of Blob Seer DFS.

关键词： distributed system Hadoop Blobseer concurrency spe

Electrospun CNT embedded ZnO nanofiber based biosensor for electrochemical detection of Atrazine: a step closure to single molecule detection

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Microsystems & Nanoengineering 2020年第1期6卷 1353-1362页

作者： Patta Supraja Vikrant Singh siva rama krishna Vanjari Shiv Govind Singh Department of Electrical Engineering Indian Institute of TechnologyHyderabadTelangana 502285India School of Medicine University of California DavisDavisCaliforniaUSA

In this study we have reported the design and development of a facile,sensitive,selective,and label-free electrochemical sensing platform for the detection of atrazine based on MWCNT-embedded ZnO *** nanofibers were characterized using scanning electron microscope(SEM),transmission electron microscope(TEM),X-ray diffraction(XRD),X-ray photoelectron spectroscope(XPS),UV-Visible spectroscope(UV-VIS),and Fourier-transform infrared spectroscope(FTIR).Electrochemical properties of MWCNT-ZnO nanofiber-modified electrodes were assessed using electrochemical impedance spectroscopy(EIS)and cyclic voltammetry(CV).Binding event of atrazine to anti-atrazine antibody,which immobilized on nanofiber-modified electrode via EDC and NHS chemistry,was transduced with *** to high conductivity,surface area,and low bandgap of MWCNT-ZnO nanofibers,we have achieved the sensitivity and limit of detection(LoD)of sensor as 21.61(KΩμg^(−1) mL^(−1))cm^(−2) and 5.368zM for a wide detection range of 10 zM–1µ*** proposed immunosensing platform has good stability,selectivity,repeatability,and reproducibility,and are less prone to interference.

关键词： fiber fibers closure

Characterization of Mullite-Zirconia Composite Processed by Non-Transferred and Transferred Arc Plasma

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Plasma Science and Technology 2009年第2期11卷 200-205页

作者： S.YUGESWARAN V.SELVARAJAN L.LUSVARGHI A.I.Y.TOK D.siva rama krishna Plasma Physics Laboratory Department of PhysicsBharathiar University Department of Materials and Environmental Engineering University of Modena e Reggio Emilia School of Materials Science & Engineering Nanyang Technological University

The arc plasma melting technique is a simple method to synthesize high temperature reaction composites. In this study, mullite-zirconia composite was synthesized by transferred and non-transferred arc plasma melting, and the results were compared. A mixture of alumina and zircon powders with a mole ratio of 3 ： 2 were ball milled for four hours and melted for two minutes in the transferred and non-transferred mode of plasma arcs. Argon and air were used as plasma forming gases. The phase and microstruetural formation of melted samples were investigated by X-ray diffraction （XRD） and scanning electron microscope （SEM）. The microstructure of the composites was found to be affected by the mode of melting. In transferred arc melting, zirconia flowers with uniform lines along with mullite whiskers were obtained. In the ease of non-transferred are plasma melting, mullite whiskers along with star shape zirconia were formed. Differential thermal analysis （DTA） of the synthesized mullite-zirconia composites provided a deeper understanding of the mechanisms of mullite formation during the two different processes.

关键词： arc plasma melting composites