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RISS 인기검색어
- 검색키워드
- 저자 : Vipul Singh (검색결과 3 건)
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Transversal lightlike submersions from indefinite Sasakian manifolds onto lightlike manifolds
Shiv Sharma Shukla,Vipul Singh 대한수학회 2023 대한수학회논문집 Vol.38 No.4
In this paper, we introduce and study two new classes of lightlike submersions, called radical transversal and transversal lightlike submersions between an indefinite Sasakian manifold and a lightlike manifold. We give examples and investigate the geometry of distributions involved in the definitions of these lightlike submersions. We also study radical transversal and transversal lightlike submersions from an indefinite Sasakian manifold onto a lightlike manifold with totally contact umbilical fibers.
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Novel Interfacial Bulk Heterojunction Technique for Enhanced Response in ZnO Nanogenerator
Pandey, Rajagopalan,Maria Joseph Raj, Nirmal Prasanth,Singh, Vipul,Iyamperumal Anand, Palani,Kim, Sang-Jae American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.6
<P>In this paper, a direct sustainable approach for the development of a n-ZnO:p-CuO heterojunction (ZCH) through a simple grinding is reported to be an effective technique to enhance the piezoelectric performance of ZCH/polydimethylsiloxane (PDMS) nanocomposite-based nanogenerators (ZP-PNGs). We have first optimized the best concentration for ZnO/PDMS nanocomposite for the realization of the piezoelectric nanogenerator. Later, with the same configuration, we implemented a novel, simple, facile, frugal, and inexpensive technique to fabricate ZCH. The heterojunction results in the improved charge transfer characteristics, low capacitance, and charge nullification contributing to the enhanced piezoelectric output. This reflects in the improvement of the peak-to-peak piezoelectric potential of the device from 2.7 to 9 V. The instantaneous max power density was found to be 0.2 mW/m<SUP>2</SUP>. The device can work as a force sensor with improved sensitivity of 1.7 V/N compared to 1.05 V/N of the intrinsic device. The device is being systematically studied for load matching and capacitor charging to demonstrate its practicability. Furthermore, we tested our device to harness the biomechanical energy from day-to-day life activities. Finally, the device was used to fabricate sustainable piezoelectric-based smart urinal systems for low-income group countries.</P> [FIG OMISSION]</BR>
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Elucidations on the effect of lanthanum doping in ZnO towards enhanced performance nanogenerators
Pandey Rajagopalan,Pramila Jakhar,I. A. Palani,Vipul Singh,Sang Jae Kim 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.7 No.1
Energy harvesting using semiconducting piezoelectric materials is one of the key areas of current research due to its high biocompatibility, low impedance, and high temperature workable range. In this work, we have optimized the doping of Lanthanum in ZnO towards the realization of enhanced output nanogenerator. We have varied the percentage of lanthanum (0, 1, 2.5, 5 and 7.5%) in the ZnO and systematically studied the piezoelectric response of each device. The piezoelectric output improved three to fourfolds by the incorporation of Lanthanum above 2.5%. The voltage response was further escalated by the controlled annealing in an oxygen environment. The doped and annealed device show eight to ninefolds improved output (~ 13.5 V) compared to the intrinsic device (~ 1.6 V). Material properties were investigated thoroughly along with the piezoelectric using various characterization tools. The device show a high maximum power density (~ 2.5 mW/m2) and was used to charge several commercial capacitors. Finally, the device was demonstrated to work in intruder-safety alarm system application as low-cost device.
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