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RISS 인기검색어
- 검색키워드
- 저자 : Jasminder Singh (검색결과 4 건)
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Jasminder Singh,Haripada Bhunia,Soumen Basu 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.60 No.-
The present study reports the use of nanocasted carbon monoliths (CMs) as adsorbents synthesized by using furfuryl alcohol as carbon precursor and silica monoliths (SM) as a template for CO2 capture. The oxygen content decreases from 18.92 to 14.38% with increase of carbonization temperature from 550 to 950 °C. BET surface area and total pore volume of CM carbonized at 950 °C was found to be maximum i.e. 1225 m2 g−1 and 1.26 cm3 g−1, respectively with the presence of a large number of micropores and mesopores. Performance evolution of the CMs was done thermogravimetrically at different adsorption temperatures and CO2 concentrations and found that, CM-950 shows the highest CO2 capacity (1.6 mmol g−1) which is approximately three times higher than SM (0.52 mmol g−1). The CMs exhibit stable CO2 uptake capacities (≥1 mmol g−1) with easy regenerability over multiple adsorption–desorption cycles. Furthermore, fractional order kinetic model provided the best description over all adsorption temperatures and CO2 concentrations. Heterogeneous nature of the carbon surface was confirmed from the Temkin isotherm fit and isosteric heat of adsorption (Qst) values.
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Environment Friendly Machining of Inconel 625 under Nano-Fluid Minimum Quantity Lubrication (NMQL)
Talwinder Singh,Jasminder Singh Dureja4,Manu Dogra,Manpreet S. Bhatti 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.11
Superalloy Inconel 625 although having many industrial applications owing to its high strength, exhibits poor machinability because of its sticky nature and poor heat conductivity. To improve its machinability, use of cutting fluids becomes necessary to remove heat and provide lubrication in the cutting region. However, harmful effects of cutting fluids on environment and operator health restrict their application. Several efforts have been carried out to replace or minimize the quantity of conventional cutting fluids used in machining to strive for green machining and economizing machining operations. Nano-fluid minimum quantity lubrication (NMQL) technique has evolved as best alternative to flood conditions cooling / lubrication especially for machining of alloys like Inconel. This paper experimentally investigates the suitability of NMQL (carbon nanotube; CNT in vegetable oil) in machining of Inconel 625. The objective was to minimize tool wear and surface roughness under different machining conditions. Tool performance in NMQL was also compared with that under dry and flood conditions. The results revealed superiority of NMQL in terms of better tool life and improved surface finish over dry machining and nearly equivalent performance to wet (flood) machining thus provides the way forward for sustainable and environmental friendly machining.
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Kaur, Narinder,Singh, Jasminder,Raj, Pushap,Singh, Narinder,Singh, Harpreet,Sharma, Sanjeev K.,Kim, Deuk Young,Kaur, Navneet The Royal Society of Chemistry 2016 New journal of chemistry Vol.40 No.2
<P>ZnO nanoparticles decorated with organic receptor 1 (R1) have been prepared and the resultant compound (N1) was investigated for its metal recognition ability. N1 was found to be selective for mercury ions (Hg2+) in a DMSO/water mixture in a ratio of 7 : 3 and possessed no interference from any of the potential interferent metal ions. The crystal size and morphology of ZnO is characterized using various spectroscopic and diffraction techniques like scanning electron microscopy, X-ray diffraction (XRD), dynamic light scattering (DLS), etc. Surface decoration of the ZnO with receptor 1 is confirmed using NMR spectroscopy. On successive additions of Hg2+ ions, the fluoresence intensity of the compound was quenched at 427 nm with enhancement of the peak at 482 nm, which led to ratiometric sensor development for the recognition of mercury ions having a detection limit of 0.19 nM. The prepared receptor was also tested for real sample application by preparing a known concentration of Hg2+ solution and it was found to respond well with an accuracy more than 90%.</P>
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Tool Wear, Chip formation and Workpiece surface issues in CBN Hard Turning: A Review
Manu Dogra,Vishal S Sharma,Anish Sachdeva,Narinder Mohan Suri,Jasminder Singh Dureja4 한국정밀공학회 2010 International Journal of Precision Engineering and Vol. No.
Steel parts that carry critical loads in everything from automotive drive trains and jet engines to industrial bearings and metal-forming machinery are normally produced by a series of processes, including time-consuming and costly grinding and polishing operations. Due to the advent of super-hard materials such as polycrystalline cubic boron nitride (PCBN) cutting tools and improved machine tool designs, hard turning has become an attractive alternative to grinding for steel parts. The potential of hard turning to eliminate the costs associated with additional finishing processes in conventional machining is appealing to industry. The objective of this paper,is to survey the recent research progress in hard turning with CBN tools in regard of tool wear, surface issues and chip formation. A significant pool of CBN turning studies has been surveyed in an attempt to achieve better understanding of tool wear, chip formation, surface finish, white layer formation, micro-hardness variation and residual stress on the basis of varying CBN content, binder, tool edge geometry, cooling methods and cutting parameters. Further important modeling techniques based on finite element, soft computing and other mathematical approaches used in CBN turning are reviewed. In conclusion, a summary of the CBN turning and modeling techniques is outlined and the scope of future work is presented.
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