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Design And Implementation of a Novel Sustain Driver for Plasma Display Panel
Pankaj Agarwal,Woosup Kim,Bohyung Cho 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
Over the years, plasma display panel (PDP) manufacturers have impressed the flat panel display industry with yet another new product essentially having the merits of a larger screen size. Since larger size implies higher power ratings, voltage/current ratings of the power devices used have become a rising concern. Another important concern is the brightness of PDP, one way of increasing which is by operating the PDP at higher frequencies. In order to address the above issues, a transformer coupled sustain-driver for AC-PDP is proposed. During the transition time, the two windings of the transformer greatly boost up the displacement current flowing through the panel capacitance and hence enable a fast inversion of the voltage polarity with practical values of resonant inductance. In the proposed topology, the resonant inductance can be increased by a factor of (n+1)² as compared to prior approaches. Increased inductance results in lower current stresses. Moreover, high frequency operation is possible by using higher value of n (tum ratio of the transformer). The operational principle and design procedure of the proposed circuit are presented with theoretical analysis. The validity of the proposed sustain driver is established through simulation and experimental results using a 42-in PDP
Pankaj Agarwal,Mukesh Kumar,Mahavir Choudhary,Ankush Sharma,Amar Patnaik 한국섬유공학회 2022 Fibers and polymers Vol.23 No.5
This work clearly demonstrates the effective utilization of industrial waste metal fiber to replace glass fiber loadingfor the development of hybrid glass/metal fiber reinforced polymer composites for marine applications. The presentcomposite is fabricated by vacuum assisted resin transfer modelling technique under controlled conditions by varying bothglass fiber and metal fiber in a desired percentage weight ratio. The fabricated hybrid composites are characterized byphysical (density and void content), mechanical (tensile strength, flexural strength, inter-laminar shear strength and impactstrength), thermomechanical analysis (storage modulus, loss modulus and damping factor), water absorption, thermalconductivity and thermo-gravimetric analysis respectively. The second part of this study mainly covers the simulationanalysis of both mechanical properties and the thermal conductivity of the hybrid polymer composites. This analysis mainlyhelps to understand the major causes affecting during experimental analysis along with finding the desired results bycomparing them with the experimental results. The last part of this analysis focuses on studying the composite defects duringmechanical characterization with the help of scanning electron microscope. Finally, adopted multicriteria decision-makingtechnique to optimize the process parameters by considering all the obtained experimental results to satisfy the proposedapplication specifically can be used for marine structure development.
Pankaj Agarwal,Ankit Gupta,Rachanna G. Angadi 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.2
The study focuses on the effect of confinement due to transverse reinforcement and FRP jacketing on the axial behavior ofconcrete and external beam-column joints (i.e., T-joints) before and after retrofitting. The effectiveness of confinement is firstlyevaluated by stress - strain behavior of square prism specimen under pure axial compression. These specimens are prepared withdifferent amount of transverse reinforcement and FRP wraps (number of layers). Secondly, the cyclic tests are also carried out onbeam-column joint specimens, with two different configurations of reinforcement detailing and retrofitted by externally bondedFRP wrapping. One specimen is designed to comply with gravity load design codes and the other with detailing according toIndian Standards. GFRP wrapping is used for retrofitting of damaged joints with epoxy resin. GFRP jacketing comes out to be aneffective technique to regain the strength and stiffness of damaged joints. Also significant gain in strength and strain is observedunder pure axial compression.
Pankaj Agarwal,Vinu Viswanath,Ani K. John,Mathew Sebastian,Harikrishna S,Jigar Pandya,Sagi Sravan Kumar 한국항공우주학회 2023 International Journal of Aeronautical and Space Sc Vol.24 No.2
CFRP sandwich structures have proved themselves as a good candidate for satellite antenna reflectors due to high bending stiffness with lower mass. Bare CFRP acts as a reflector for frequencies up to Ku-band beyond which reflective properties are insufficient. Studies are carried out by researchers to improve the reflectivity of CFRP sandwich structures and one of the widely adopted methods is metallisation of the reflective surface of CFRP. Glass transition temperature (Tg) of CFRP is much below the melting point of metals, which makes the process of metalising more challenging. This is overcome by a few approaches such as chemical vapour deposition, sputtering, and cold spray. In the present study, a unique concept of metalising the CFRP sandwich dish by co-curing it with copper-cladded polyimide film is presented. To facilitate the bond between CFRP and copper-cladded polyimide film, the resin available in CFRP prepreg itself is used during the co-curing process. The procedure was successfully adopted in a high-throughput satellite payload of ISRO missions.
Ankush Sharma,Mahavir Choudhary,Pankaj Agarwal,Shivam Joshi,S.K. Biswas,Amar Patnaik 한국섬유공학회 2021 Fibers and polymers Vol.22 No.4
In the present research work, the needle-punched nonwoven jute epoxy composites are fabricated by varying theweight percentages of sponge iron slag in vacuum assisted resin transfer molding technique. This study examines thephysical, mechanical and thermomechanical properties (i.e., density, water absorption, tensile, flexural, inter-laminar shearstrength, compression, impact, fracture toughness and dynamic mechanical analysis) of unfilled and 8 wt.%, 16 wt.% and24 wt.% of sponge iron slag filled composites under controlled operating conditions. Moreover, it is shown that all themechanical properties improved with the increased in sponge iron slag content except for tensile strength which increasedonly upto 16 wt.%. This study also attempted for the analysis of thermal conductivity of the unfilled and particulate filledcomposites in experimentally by hot disc method. This work also presents both existing empirical models and numericalsimulation analysis to evaluate the thermal conductivity of the developed composites. The numerical simulation values of thethermal conductivity demonstrated good agreement with the experimental values. At the end, Cole-Cole plot is drawnbetween loss modulus and storage modulus to understand the nature of the proposed composites.
Varaha Venkata Satya Surya Kumar Dadi,Pankaj Agarwal 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.2
The purpose of this study is to update the non-linear modeling of soft storey RC frame building for performance based design. The qualitative and quantitative assessment of different strength and ductility parameters of tested building components including the different types of reinforcing steel have been presented. The cyclic performance of tested G+2 soft storey RC frame building of ¼ scale is evaluated and the components test results are applied successfully for performance evaluation of prototype soft storey RC frame buildings under different modes of failure. It indicates that the non-linear characteristics of reinforcement used in different components of building frame have significant influence on the global failure pattern particularly assuring a flexure mode of failure.