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Ludhiana, India

Chhabra M.,Moradabad Institute of Technology | Singh R.,Guru Nanak Institutions
Rapid Prototyping Journal | Year: 2011

Purpose: This paper seeks to review the industrial applications of state-of-the-art additive manufacturing (AM) techniques in metal casting technology. An extensive survey of concepts, techniques, approaches and suitability of various commercialised rapid casting (RC) solutions with traditional casting methods is presented. Design/methodology/approach: The tooling required for producing metal casting such as fabrication of patterns, cores and moulds with RC directly by using different approaches are presented and evaluated. Relevant case studies and examples explaining the suitability and problems of using RC solutions by various manufacturers and researchers are also presented. Findings: Latest research to optimize the current RC solutions, and new inventions in processing techniques and materials in RC performed by researchers worldwide are also discussed. The discussion regarding the benefits of RC solutions to foundrymen, and challenges to produce accurate and cost-effective RC amongst AM manufacturers concludes this paper. Research limitations/implications: The research related to this survey is limited to the applicability of RC solutions to sand casting and investment casting processes. There is practically no implication in industrial application of RC technology. Originality/value: This review presents the information regarding potential AM application - RC, which facilitates the fabrication of patterns, cores and moulds directly using the computer-aided design data. The information available in this paper serves the purpose of researchers and academicians to explore the new options in the field of RC and especially users, manufacturers and service industries to produce casting in relatively much shorter time and at low cost and even to cast complex design components which otherwise was impossible by using traditional casting processes and CNC technology. © Emerald Group Publishing Limited. Source

Singh K.,Guru Nanak Institutions | Padhy N.P.,Indian Institute of Technology Roorkee | Sharma J.,Indian Institute of Technology Roorkee
IEEE Transactions on Power Systems | Year: 2011

This paper investigates the influence of price responsive demand shifting bidding on congestion and locational marginal prices in pool-based day-ahead electricity markets. The market dispatch problem of the pool-based day-ahead electricity market is formulated as to maximize the social welfare of market participants subject to operational constraints given by real and reactive power balance equations, and security constraints in the form of apparent power flow limits over the congested lines. The social welfare objective function of the day-ahead market dispatch problem maximizes the benefit of distribution companies and other bulk consumers based on their price responsive demand shifting bids and minimizes the real and reactive power generation cost of generation companies. The price responsive demand shifting bidding mechanism, which has been recently introduced in the literature, is able to shift the price responsive demand from the periods of high price to the periods of low price in day-ahead electricity markets. The comparisons of the price responsive demand shifting bids with conventional price responsive and price taking bids are presented by solving hourly market dispatch problems on five-bus, IEEE 30-bus, realistic UP 75-bus Indian, and IEEE 118-bus systems for 24-h scheduling period. It has been demonstrated that the proposed approach leads to reduction in congestion and locational marginal prices as compared to price responsive and price taking bids and meets the energy consumption targets of distribution companies/bulk consumers. © 2010 IEEE. Source

Kumar P.,Guru Nanak Institutions
Chinese Journal of Chemistry | Year: 2010

Synthesis of bis-1,3-{6'-arylimidazo[2,1-b][1,3,4]thiadiazol-2-yl}-1,2,2-trimethylcyclopentane (3), bis-1,3-{thiadiazolo[2',3':2,1]imidazo[4,5-b]quinoxalinyl}-1,2,2-trimethylcyclopentane (5) has been achieved by the reaction of bis-(5'-amino-1',3',4'-thiadiazolyl)-1,2,2-trimethylcyclopentane with α-haloketones, 2,3-dichloroquinoxaline respectively. Bromination of compound 3 furnished bis-1,3-{5'-bromo-6'-arylimidazo[2,1-b][1,3,4]thiadiazol-2-yl}-1,2,2-trimethylcyclopentane (4). The structural assignment of these compounds was supported by IR, 1H NMR and elemental analysis data. The antimicrobial, anti-inflammatory and antifungal activities of some of the compounds have also been evaluated. © 2010 SIOC, CAS, Shanghai, & WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Singh U.,Guru Nanak Institutions | Kamal T.S.,DIET
IET Microwaves, Antennas and Propagation | Year: 2011

Biogeography-based optimisation (BBO) is employed for the optimisation of non-uniform circular antenna arrays. In BBO, the problem solutions are represented as islands and the sharing of features between solutions corresponds to immigration and emigration between the islands. The scheme of BBO is employed to find out an optimal set of weights and antenna element separations to provide a radiation pattern with maximum side lobe level (SLL) reduction with the constraint of a fixed major lobe beam width. The capability of BBO is demonstrated by taking different sizes of antennas. The results show that the design of non-uniform circular antenna arrays using the BBO algorithm offers a SLL reduction better than that obtained using genetic algorithms, particle swarm optimisation and simulated annealing.© 2011 The Institution of Engineering and Technology. Source

Singh R.,Guru Nanak Institutions
Rapid Prototyping Journal | Year: 2013

Purpose - Fused deposition modeling (FDM) is an additive manufacturing technology commonly used for modelling, prototyping, and batch production applications. The purpose of this paper is to investigate properties of plastic replicas, fabricated as small-sized product moulds with FDM. Design/methodology/approach - From the identification of component, prototypes of ABS plastic material were prepared for commercial end-user applications, such as vacuum moulding, vacuum casting, investment casting, etc. Findings - The study highlighted the best settings of orientation and support material quantity for the selected component on FDM machine, from the dimensional accuracy and economic points of view. Originality/value - Final replicas prepared are acceptable as per DIN 16901 and ISO (UNI EN 20286-I-1995) standard for industrial applications. The results are also supported by SEM analysis. © Emerald Group Publishing Limited. Source

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