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383 results on '"Kumar, G.S."'

31. An improved compocasting technique for uniformly dispersed multi-walled carbon nanotube in AA2219 alloy melt

Author

Thomas Shijo, Keshavamurthy R., Kumar G.S. Pradeep, Tambrallimath Vijay, and Prasanna G.D.

Subjects
casting, composites, aluminium, alloys, nanotube, mwcnt, nanocomposites, compocasting, Engineering (General). Civil engineering (General), TA1-2040, Mechanics of engineering. Applied mechanics, TA349-359
Abstract

Technology transfer for economic bulk production is the greatest challenge of the era. Production of high strength lightweight materials with nanocarbon reinforcement has attained its importance among the researchers. Property enhancement with multi-walled carbon nanotube (MWCNT) reinforcement is reported by all researchers. But effective utilization of its property remains a challenge even though it is the strongest material in the world. Achieving homogeneous dispersion especially in molten metal is a complex task. To address the same, a new approach was tried which could trigger de-bundling and make a uniform dispersion. Various metallurgical and mechanical characterizations were done. Grain refinement and the structure were studied with an optical microscope, MWCNT dispersion and structural damage was studied using field emission scanning microscope, Phase change and reactions during casting was done with XRD scan. The method remarkably facilitated 23.7% and 69.75% improvement in hardness and ultimate compressive strength respectively with the addition of MWCNT.

Published
2020

32. Friction and wear behaviour of copper reinforced acrylonitrile butadiene styrene based polymer composite developed by fused deposition modelling process

Author

Keshavamurthy R., Tambrallimath Vijay, Badari Abhinandan, Krishna R. Anand, Kumar G.S. Pradeep, and Jeevan M.C.

Subjects
abs, copper, fdm, friction, wear, scanning electron microscopy, Engineering (General). Civil engineering (General), TA1-2040, Mechanics of engineering. Applied mechanics, TA349-359
Abstract

This paper focuses on the development of copper filled Acrylonitrile Butadiene Styrene (ABS) composites by fused deposition modelling (FDM) and to characterize its friction and wear behaviour. Twin screw extrusion technique was employed to extract copper-ABS composite filament. Three different materials were tested, i.e. pure ABS, ABS+2.5wt% Cu and ABS+5wt% Cu. Friction and wear characteristics of pure ABS and copper filled ABS composites were tested under various loads and sliding velocities. Addition of Copper powder has significantly improved the friction and wear properties of the developed composites. Further, it is also observed that friction and wear behaviour increased with increase in copper content in ABS. Worn out surfaces were subjected to scanning electron microscopy studies to analyse and identify the possible wear mechanisms involved.

Published
2020

34. List of contributors

Author

Aditya, A.V., primary, Arya, Shashi Bhushan, additional, Basumataray, Anirban, additional, Bijukumar, Divya, additional, Cheng, Kai-Yuan, additional, Pradeep Kumar, G.S, additional, Ghanbarzadeh, Ali, additional, Jana, Ashirbad, additional, Joseph, Fredy James, additional, Kanagaraj, Subramani, additional, Kasar, Ashish, additional, Keshavamurthy, R., additional, Mathew, Mathew, additional, McNallan, Michael, additional, Menezes, Pradeep L., additional, Neville, A., additional, Ramachandran, Rahul, additional, Ramesh, C.S., additional, Rao, A.V. Mohan, additional, Ripoll, Manel Rodríguez, additional, Runa, Maria, additional, Salloom, R., additional, Senthilvelan, S., additional, Siddaiah, Arpith, additional, Tambrallimath, Vijay, additional, Torres, Hector, additional, and Venkatesh, M., additional

Published
2021
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43. Sorghum: A Multipurpose Bioenergy Crop

Author

Rao, P. Srinivas, primary, Vinutha, K.S., additional, Kumar, G.S. Anil, additional, Chiranjeevi, T., additional, Uma, A., additional, Lal, Pankaj, additional, Prakasham, R. S., additional, Singh, H.P., additional, Rao, R. Sreenivasa, additional, Chopra, Surinder, additional, and Jose, Shibu, additional

Published
2019
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44. Characteristics, types and causes of chest pain in an urban family practice secondary care center in South India

Author

Yeshvanth Kumar G.S., Prince Christopher Rajkumar Honest, Apoorva Subramanian, Ranjit Abraham, Saran Teja Velaga, Ruby Angeline Pricilla, Kirubah Vasandhi David, and Sunil Abraham

Subjects
chest pain, family practice, secondary care, India, Medicine
Abstract

Background . Chest pain is a common diagnostic problem faced by primary and emergency care physicians. We are taught to consider the cardiac cause of chest pain as the usual cause from our undergraduate textbooks. Though the cardiac cause of chest pain is one of the more serious causes, it may not be the common one. There was a paucity of data available concerning this common problem in the Indian context. We present an observational study of causes of chest pain in 254 adults presenting to an ambulatory secondary care unit. Material and methods . All consecutive adults (over 18 years of age) presenting with chest pain to the urban family health center were administered a questionnaire documenting location, severity, characteristic and cause of chest pain as diagnosed by relevant clinical examination and appropriate investigations. This was done in the time period from September 2014 to July 2016. Results . A total of 254 adults with chest pain were studied, among whom 73.6% (187) were female. The most common diagnosis as to the cause of chest pain made by the treating physician was of a gastro-esophageal cause (41.3%, 105). A cardiac origin of chest pain was diagnosed in 18.5% (47) of the patients. Conclusions . The causes of chest pain in adults vary with the setting and the target population. It is mostly non-cardiac in ambulatory care practices in primary and secondary care units. However, we need to be clinically vigilant and apply a robust approach in diagnosing chest pain.

Published
2017
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