Dr. Prem Kumar Singh,
Gandhi Institute of Technology and Management, India
Speech Title: Dark Data representation using Turiyam Set
Abstract: Recently, several attention has been paid towards dark data analysis and its representation. There are many examples for dark data analysis like medical diagnoses, soil pollution, global warming and Anthropocene. The problem arises while precise representation of dark data sets to measure its impact. It is indeed a requirement as the impact of dark data sets is connected with human health and its uncertainty. One of the reasons arises while dark data analysis and its impact analysis while its representation. In this talk the speaker will try to discuss some of the dark data related to the environment and its analysis using the Turiyam set. This set is recently introduced for dealing with the fourth dimensional data representation. The algebra of the Turiyam set will be also discussed for further enhancement.
Biography: Dr. Prem Kumar Singh has more than 12 Years of experience in teaching, research and academics. Currently, he is working as an Associate Professor at Department of Computer Science and Engineering, Gandhi Institute of Technology and Management-Visakhapatnam, Andhra Pradesh-India. Prior to that, he worked as capacity of as an Assistant Professor at Amity School of Engineering and Technology, Amity University-Noida Sector 125. He has completed a Post-Doc in Computer Science from Faculty of Computer Science and Information Technology, University of Malaya-Kuala Lumpur which was fully funded by HIR Lab Malaysian Govt of Higher Education. He holds a PhD degree in Computer Science from School of Information Technology and Engineering, VIT University-Vellore which was fully funded by NBHM Department of Atomic Energy, Govt of India. He obtained a Master Degree in Computer Applications from the CSJM University, Kanpur –India after completion of Bachelor Degree in Computer Science from University of Allahabad-Uttar Pradesh, respectively. His current research interests are soft computing, complex data analysis, graph theory, mathematical modelling and machine intelligence. Towards this direction, he has introduced interval-valued, bipolar, three-polar, m-polar, and complex fuzzy graphs as frontier researchers in this field for knowledge processing tasks. Due to these works he is listed as Top 2% Scientist by Stanford University in consecutive years 2020 and 2021. Recently, he introduced Turiyam set for fourth dimensional data representation and its analysis. He has published more than 80 research papers in peer reviewed conferences and journals which were cited more than 1380 with 23 H-index and more than 38 i10 papers. He has filed a Malaysian patent for query optimization. He has a copyright of Python based code for research impact analysis of any University on Several Metrics which echo with NIRF ranking 2019. This analysis was used recently by DST for Promotion of University Research and Scientific Excellence– 2021 (https://dst.gov.in/callforproposals/announcement-call-purse-2021). He served as Technical Program Committee, Reviewer, Guest Editor, Editorial board member as well as Speaker for more than 150 peer reviewed conferences and journals. He is Editor-In-Chief for “Journal of Neutrosophic and Fuzzy Systems” and Associate Editor for several Journals.
Prof. Krishna Murari Pandey,
National Institute of Technology Silchar, India
Speech Title: Experimental Investigation on AA7075/B4C/ZrC Hybrid Nanocomposite Fabricated by Powder Metallurgy Techniques
Abstract: Composites play a major role in the present generation by adopting properties from added reinforcements. Among different available reinforcement particles, B4C and SiC are majorly used. B4C is used in structural applications due to high brittle nature that protects from shocks localized at high strain rates. There are various fabrication techniques to fabricate metal matrix composites. By conventional methods agglomeration of the reinforced particles in the molten metal was the major problem due to their high surface energies which are readily to react and also factors like particle size, shape, formation of an electrical charge while stirring lead to agglomeration effects. To eliminate these types of defects in the composite materials, many of the researchers choose Powder Metallurgy as their preferable fabrication technique. In this solid-state technique, uniform dispersion of reinforcement particles can be achieved by mechanical milling techniques. Ball milling is the technique used to reduce particle size of reinforcements, and for effective dispersion of reinforcements in matrix material. In powder metallurgy, properties of the composites mainly depend upon the quality of the green compact specimen, and this quality depends upon the densification behaviour of powders while compaction. Another important phenomenon that severely affects the properties of the composite materials is generation of intermetallic compounds at matrix and reinforcement interfaces. These brittle intermetallic compounds at interface regions limits the load transfer phenomenon between matrix and reinforcements. These intermetallic compounds generate mainly due to availability of excess free energies because of high temperatures for a prolonged period in conventional sintering processes. The chances of generation of intermetallic compounds at interface regions sounds more in nano composites and hybrid nanocomposites. Researchers reported that, microwave sintering helps in fabrication of high-performance composite materials with no intermetallic compounds generation in it due to its unique features like internal heat generation, low sintering times, low sintering temperatures and rapid heating rates. In the present work, investigation was carried out on AA7075 aluminium alloy with B4C and ZrC as reinforcement materials. Different composite combinations were fabricated through powder metallurgy process and the effect of different sintering mechanisms on microstructure and mechanical properties on the fabricated composites were investigated. Type of failure was also investigated through fractography analysis. Firstly, investigation was performed on AA7075/B4C composite fabricated through two sintering techniques namely conventional sintering and microwave sintering. After satisfactory results through advanced sintering mechanisms, Nano ZrC particles were added to optimised volume fractioned AA7075+6%B4C Nanocomposite and fabrication process was performed through conventional and microwave sintering techniques and mechanical responses were noted.
Firstly, the present work focusses on the fabrication of the AA7075/B4C micro composite subjected to different sintering techniques. Fabrication techniques involve, ball milling of boron carbide powders, to reduce its size from 50 μm to 10 μm. Mixing of B4C powders with AA7075 alloy powders was carried out in the ball milling machine with 6% B4C as reinforcement composition, followed by cold compaction, and then sintering happened using three techniques namely, conventional sintering, and microwave assisted sintering. The microstructural investigation was carried out under SEM integrated with EDS to determine the distribution of reinforcement particles and characterization of fabricated samples. Tensile, compression, and hardness tests were conducted to examine the effect of sintering techniques. Results showed superior enhancement in the mechanical properties in microwave sintered composites compared to conventional sintering processes as it sinters in significantly less time, and at low temperatures. The conventionally sintered composite showed inadequate mechanical responses because of their high-temperature processing and time, intermetallic compound formation, high porosity levels. Among the adopted two sintering techniques, microwave sintering gave the best mechanical properties to the composite materials and high strain to fracture values.
Further investigation was carried out on AA7075+6%B4C+3%ZrC nano hybrid composite, AA7075+6%B4C+3%ZrC nano hybrid composite was successfully fabricated, with nano reinforcements composition in AA7075 alloy selected based on previous investigation, to achieve better mechanical performance. Two different sintering techniques, namely conventional and microwave, were implemented to determine the effect on microstructural and mechanical properties. Microstructural investigation was performed with the help of W-SEM. Tensile, compression, and hardness were measured with the help of UTM and Vickers microhardness machine. It was observed that the added nano ZrC particles formed agglomerates and the B4C particles were distributed homogenously. Composites processed by microwave sintering showed excellent mechanical properties compared to the conventionally sintered composites. No intermetallic compounds were detected in microwave sintered composites through XRD analysis, indicating strong and clean interface bonds between matrix and reinforcement particles. High strain to fracture value of 12.24% was noted in microwave sintered nano hybrid composite, while it was 6.12% for conventional sintered one. Fractography revealed no peeling action of reinforcements from the matrix material, and the mode of failure was brittle. It was concluded that, while fabricating nano range hybrid composites, the implementation of advanced sintering technique (microwave sintering) with low sintering temperatures and low sintering times with internal heat generations, helps in eliminating defects that may develop because of high surface energies of nano range reinforcements.
Biography: Prof. K.M. Pandey obtained B.Tech in Mechanical Engineering from BHUIT, Varanasi now known as IIT BHU in 1980. Dr. Pandey also did M.Tech in Heat Power from the same Institute in 1987. Prior to Joining REC Silchar Dr. Pandey served in BIT Mesra Ranchi as Associate Lecturer for a period of 3 Years and 6 Months. Dr. Pandey did his PhD in Mechanical Engineering in 1994 from IIT Kanpur. Dr. Pandey has served NIT Silchar as assistant professor for a period of more than 15 years i.e from March 1991 to May 2006. He has published and presented more than 325 papers in International & National Journals and Conferences. His h-index in google scholar is 23. Dr. Pandey has also served in Colombo Plan Staff College Manila, Philippines in the year 2002 as Faculty Consultant seconded by Govt. of India. Currently he is working as Senior Professor in Department of Mechanical. Engineering, of National Institute of Technology, Silchar, Assam, India. He has also served the department in the capacity of head for two terms of 3 years at NIT Silchar. He has also served as member of Board of Governors of NIT Silchar for two terms. His research interest areas are the following; Combustion, High Speed Flows, Technical Education, Heat Transfer, Internal Combustion Engines, Human Resource Management, Gas Dynamics and Numerical Simulations in CFD area from Commercial Softwares. Dr. Pandey has got more than 70 SCI indexed journal papers and more than 160 research articles are indexed in Scopus. His h-index in Scopus is 18. He has guided 14 for Ph.D and 89 for M.Tech. so far. He has also worked as dean faculty affairs and dean research for 3 months each in the year 2012 and 2013. He has delivered many key note speeches in India, Singapore, and China. He has also chaired one session in IMECE 2011 organised by ASME and SEEP 2019 at University of Sharjah, where he conducted one special session on computational combustion.