Browsing by Author "Kumawat, N."

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    High figure-of-merit in Zn, Sb co-doped Mg2Si0.3Sn0.7 alloy through simultaneous optimization of electrical and thermal transports
    (Elsevier Ltd, 2025) Sarkar, P.; Gupta, P.; Shenoy, U.S.; Singh, S.; Kundu, S.; Kumawat, N.; Kedia, D.K.; Bhat, D.K.; Bhattacharya, S.; Singh, A.
    The derivatives of Mg2Si have recently attracted wide attention as promising thermoelectric materials due to earth abundant and environment friendly low-cost constituents. The main challenge in optimizing the thermoelectric figure of merit ZT, is the low electrical and high thermal conductivities of Mg2Si. The present study demonstrates high ZT of ?1.55 at 673 K in Mg2Si0.3Sn0.7 through simultaneous optimization of electrical and thermal transport through Sb and Zn co-doping. The ultra-low deformation and alloy scattering potentials in Sb and Zn co-doped samples helps in maintaining record high Hall mobility ?70–90 cm2/V.s. The doping induced pudding mold band structure with hyperconvergence in conduction band balances high Seebeck coefficient and high electrical conductivity. The point defects and dislocations created by doping helps in lowering of lattice thermal conductivity as well. The uni-leg power generator fabricated using optimized Mg1.96Zn0.04(Si0.3Sn0.7)0.98Sb0.02 exhibits a record efficiency of ?9.5 % at ?T ? 329 K. © 2025
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    Utilizing NFTs to Revolutionize Document Verification and Authentication through Blockchain: Redefining Trust in the Digital Era
    (Institute of Electrical and Electronics Engineers Inc., 2024) Kumawat, N.; Naik, D.
    The significance of certificates issued by educational institutions for graduates cannot be overstated, as they serve as crucial documents for verification purposes in various contexts such as employment and passport verification. However, traditional verification methods are often costly and inefficient. This research paper aims to introduce a blockchain-based framework for certificate verification, leveraging features such as hashing, digital signatures, and public/private key cryptography inherent in blockchain technology. By incorporating additional security measures like biometrics and encryption for secure document storage using IPFS (Inter-Planetary File System), this framework ensures the integrity and authenticity of certificates. The utilization of blockchain not only enhances the security of data storage due to its immutable nature but also streamlines the verification process, offering a cost-effective and efficient alternative to traditional methods. © 2024 IEEE.