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- 저자 : K. S. Tarun (검색결과 4 건)
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Cutting tool performance analysis of P/M alloy steel under turning of copper material
T. Panneerselvam,T. K. Kandavel,T. K. Chaitanya,K. S. Tarun 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.9
Automation in machining processes requires high strength new cutting tool to co-up with high speed, feed and high-temperature working conditions. The present work is aimed to analyze the performance of newly fabricated powder metallurgy (P/M) alloy steel, Fe-0.5 %C-2 %Cu-2 %Mo-2 %Ti as a cutting tool under turning of copper material using a conventional lathe. Taguchi’s experimental design matrix is used to conduct the experiment with cutting speed, depth of cut and feed rate as working parameters. The tool performance is assessed by evaluating the surface quality of the work material. Signal-to-noise ratio employs to optimize the working parameters. The surface roughness of copper work material machined by the P/M tool is a minimum at 43.175 m/min, 0.1 mm and 0.43 mm/rev of cutting speed, depth of cut and feed rate, respectively. Finally, the experimental analysis reveals that the P/M cutting tool will exhibit a comparable performance against the conventional HSS tool.
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Tarun Bhardwaj,Mukul Shukla,Nisheeth K. Prasad,C. P. Paul,K. S. Bindra 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.7
In this study, the direct laser deposition-additive manufacturing (DLD-AM) process is employed to fabricate Ti–15Mobiomedical alloy along two build directions. The aim is to analyse the effect of induced surface topography on corrosionand in-vitro bioactivity, motivated towards ultimate reduction in post-fabrication surface modifications. The effectof surface roughness on corrosion resistance is analysed in-vitro in simulated body fluid (SBF) by electrochemical study. Owing to higher surface roughness in the vertical build samples (Ra = 52.70 ± 11.40 μm) than the horizontal build samples(Ra = 27.10 ± 4.17 μm), upto 75% higher corrosion resistance is found for horizontally built samples. The double passivebarrier layer formed in horizontal build higher surface finish samples results in lower corrosion. Further, wettability testconfirms that both the build orientations exhibit a hydrophilic surface nature, leading to improved cell attachment. SEM–EDSanalysis establishes the in-vitro apatite formation on immersion in SBF, for both build orientation samples. This study leadsto understand the role of build orientation induced surface topography for production of minimal post-surface treatmentTi–15Mo bio-implants by the DLD-AM process.
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Tree Biotechnology and Environmental Concerns
Kant, Tarun,Emmanuel, C.J.S.K. The Korean Society of Plant Biotechnology 2004 Plant molecular biology and biotechnology research Vol.6 No.1
Forestry sector has witnessed some unprecedented events in the recent past both in terms of galloping biotechnological developments and heated environmental debates over risks associated with release of transgenic trees. Improvements in the in vitro propagation techniques has made it possible to develop tissue culture based plant regeneration protocols just for about any tree species. And with the inclusion of every new species within the realms of tissue culture technology, it becomes a candidate for genetic improvement through recombinant DNA technology, the so called genetic engineering. Poplars and their hybrids serve as the model tree species on which most of the genetic transformation work as been carried out. A lot of work has also gone in genetic transformation of fruit trees and trees of horticultural interests. Trees have been successfully transformed for traits ranging from reduction of length of juvenile phase to alteration of tree architecture to altering wood quality by lignin and cellulose modification. More-over trees have been genetically engineered successfully to combat various types of insect pests and pathogens causing diseases. But all these developments have ignited controversies over the possible benefits and risks associated with transgenic plantations by various environmental agencies and activists. Solutions to most of these concerns can be found out with more intensive prioritized research.
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Deepak K Dash,Siva S Nayak,Soma Samanta,Tirtha Ghosh,Tarun Jha,Bhim C Maiti,Tapan K Maity 한국생약학회 2007 Natural Product Sciences Vol.13 No.1
plant Ichnocarpus frutescens (Linn) R.Br. (Family-Apocynaceae) has been indicated for thethe possible antitumor activity and antioxidant role of Ichnocarpus frutescens in the mice transplanted withEhrlich ascites carcinoma (EAC). The chloroform and methanol extract of whole plant of Ichnocarpus frutescens(CEIF and MEIF) were administered intraperitoneally at the dose of 150 mg/kg and 300 mg/kg, body weight perday for 7 days after 24 h of tumor inoculation in mice. Treatment with CEIF at the dose of 150 mg/kg and300 mg/kg remarkably decreased the tumor volume, packed cell volume, viable cell count and increased thekg. Further the EAC mice treated with CEIF and MEIF showed significant decrease in the level of lipidperoxidation and significant increase in the level of antioxidant enzymes such as glutathione (GSH), superoxidedismutase (SOD) and catalase (CAT), however the decreasing and increasing capacity of CEIF was less in bothdoses as compared to MEIF. Based on these results, it can be concluded that the chloroform and methanol extactof Ichnocarpus frutescens exhibit significant antitumor and antioxidant activity in EAC bearing mice.Key wordsIchnocarpus frutescens, Ehrlich ascites carcinoma, antitumor activity, in vivo antioxidant activity.
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