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RISS 인기검색어
- 검색키워드
- 저자 : R. S. Mulik (검색결과 3 건)
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Pandit, V.,Arbuj, S.,Hawaldar, R.,Kshirsagar, P.,Mulik, U.,Gosavi, S.,Park, C. J.,Kale, B. Royal Society of Chemistry 2015 Journal of Materials Chemistry A Vol.3 No.8
<P>Previous studies related to the synthesis of stable UV-visible light active photocatalysts for hydrogen generation have been limited to inorganic semiconductors and their nano-and hetero-structures. We demonstrate here the use of an organo-inorganic 6,13-pentacenequinone (PQ)-TiO2 coupled semiconductor nanosystem as an efficient photocatalyst active in visible light for the production of hydrogen. Anatase TiO2 nanoparticles (3-5 nm) were uniformly decorated on thin sheets of monoclinic PQ by an in situ solvothermal method. These as-prepared PQ-TiO2 coupled semiconductor nanosystems had a band gap in the range 2.7-2.8 eV. The strong emission at 590 nm can be attributed to the transfer of electrons from the LUMO energy level of TiO2 to combine with the holes present in the HOMO level of PQ. This electron-hole recombination makes availability of electrons and holes in LUMO of PQ and HOMO of TiO2, respectively. This hybrid semiconductor coupled nanosystem resulted in a rate of hydrogen evolution of 36 456 mu mol h(-1) g(-1) from H2S under UV-visible light; this is four times higher than the rate obtained with TiO2 in earlier reports of UV-visible light active photocatalysts. These results open up a new path to explore inorganic systems coupled with PQ as new photoactive hybrid catalysts in a number of chemical and physicochemical processes.</P>
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A. Vishvesha, C. Pandey,M. M. Mahapatra,R. S. Mulik 한국강구조학회 2017 International Journal of Steel Structures Vol.17 No.1
While predicting the welding distortion for a complex welded structure like the guide blade carrier assembly of power generation turbine, the traditional thermo-mechanical models commonly utilized for geometrically simple welded butt and T joints may not be adequate. For large and complex welded structures,the thermo-mechanical elasto-plastic analysis can be computationally prohibitive. Other than simplistic butt and T joints, the aforementioned distortion prediction technique is not so suitable to provide reliable results when applied to large complex 3-D welded structures. Hence, inherent strain method is proposed here to predict distortion in an outer ringof GBC (Guide Blade Carrier) of a steam turbine. Such welded outer rings of GBC are large welded structures having many welded joints of different weld geometries at several planes. In the present study, inherent strain based technique was utilized for the aforementioned welded structure in elastic finite element analysis for the accurate prediction of 3-D distortion patterns with reduced computational time. The predicted and measured values of 3- D distortions of GBC were observed to be in good agreement with the ones provided from the shop floor, indicating the adequacy of inherent strain based method for the prediction of welding distortion in large and complex welded structures. As part of this investigation, a suitable welding fixture was also designed and welding sequence was modified, which were verified through inherent stain method to aid in minimizing the distortion of welded GBC.
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Thermal Barrier Coatings—A State of the Art Review
Jayant Gopal Thakare,Chandan Pandey,M. M. Mahapatra,R. S. Mulik 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.7
Thermal barrier coatings (TBCs) have seen considerable advancement since the initial testing and development of thermalspray coating. Thermal barrier coatings are currently been utilized in various engineering areas which include internal combustion engines, gas turbine blades of jet engines, pyrochemical reprocessing units and many more. The development of newmaterials, deposition techniques is targeted at improving the life of the underlying substrate. Hence, the performance of thecoating plays a vital role in improving the life of substrate. The scope for advancement in thermal barrier coatings is veryhigh and continuous eforts are being made to produce improved and durable coatings. Thermal barrier coatings have thepotential to address long term and short-term problems in gas turbine, internal combustion and power generation industry. The study of thermal barrier coating material, performance and life estimation is a critical factor that should be understood tointroduce any advancement. The present review gives an overview of the thermal spraying techniques and current advancements in materials, mechanical properties, understanding the high temperature performance, residual stress in the coating,understanding the failure mechanisms and life prediction models for coatings.
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