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RISS 인기검색어
- 검색키워드
- 저자 : Raaja, Bhaskaran Prathish (검색결과 3 건)
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Raaja, Bhaskaran Prathish,Daniel, Rathnam Joseph,Sumangala, Koilmani The Korean Institute of Electrical and Electronic 2017 Transactions on Electrical and Electronic Material Vol.18 No.2
Cantilever beam MEMS piezoelectric accelerometers are the simplest and most widely used accelerometer structure. This paper discusses the design of a piezoelectric accelerometer exclusively for SHM applications. While such accelerometers need to operate at a lower frequency range, they also need to possess high sensitivity and low noise floor. The availability of a simple model for deflection, charge, and voltage sensitivities will make the accelerometer design procedure less cumbersome. However, a review of the open literature suggests that such a model has not yet been proposed. In addition, previous works either depended on FEM analysis or only reported on the fabrication and characterization of piezoelectric accelerometers. Hence, this paper presents, for the first time, a simple analytical model developed for the deflection, induced voltage, and charge sensitivity of a cantilever beam piezoelectric accelerometer.The model is then verified using FEM analysis for a range of different cases. Further, the model was validated by comparing the induced voltages of an accelerometer estimated using this model with experimental voltages measured in the accelerometer after fabrication. Subsequently, the design of an accelerometer is demonstrated for SHM applications using the analytical model developed in this work. The designed accelerometer has 60 mV/g voltage sensitivity and 2.4 pC/g charge sensitivity, which are relatively high values compared to those of the piezoresistive and capacitive accelerometers for SHM applications reported earlier.
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M. Raaja Rajeshwari,Asad Syed,Ali H. Bahkali,Abdallah M. Elgorban,M. Kalil Rahiman,Rajender S. Varma,S. Sudheer Khan 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.115 No.-
In this work, rGO-based ternary dual Z-scheme heterojunction (rGO/CuFe2O4/CdS/Bi2S3 QDs) was formulatedfor the effective photo-Fenton assisted photocatalytic degradation of a b-blocker, atenolol. The catalystwas synthesised via a simple co-precipitation/hydrothermal method and was characterized usingXRD, XPS, FT-IR, SEM, TEM, PL, EIS, ESR, Raman and DRS. It exhibited about 76.5% degradation of atenololin 360 min under visible light irradiation with a rate constant of 0.004 min1 wherein the mechanism ofenhanced activity was attributed to the formation of OH, h+ and photo-Fenton reaction; a possible mechanismwas drafted. The intermediates were determined using GC–MS analysis delineating a plausibledegradation pathway, the mineralization of atenolol being confirmed by TOC analysis. The catalyst wasreusable and highly stable up to six cycles of degradation, as affirmed via XRD and XPS analysis. Further, the toxicity of the catalyst has been studied using the root cells of Allium cepa, and the degradedproduct and intermediates were assessed deploying ECOSAR software. Thus, the proposed work haspotential which can be implemented in future for the large-scale purification of wastewater.
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Bhaskaran Prathish Raaja,Rathnam Joseph Daniel,Koilmani Sumangala 한국전기전자재료학회 2017 Transactions on Electrical and Electronic Material Vol.18 No.2
Cantilever beam MEMS piezoelectric accelerometers are the simplest and most widely used accelerometerstructure. This paper discusses the design of a piezoelectric accelerometer exclusively for SHM applications. Whilesuch accelerometers need to operate at a lower frequency range, they also need to possess high sensitivity andlow noise floor. The availability of a simple model for deflection, charge, and voltage sensitivities will make theaccelerometer design procedure less cumbersome. However, a review of the open literature suggests that such amodel has not yet been proposed. In addition, previous works either depended on FEM analysis or only reported onthe fabrication and characterization of piezoelectric accelerometers. Hence, this paper presents, for the first time, asimple analytical model developed for the deflection, induced voltage, and charge sensitivity of a cantilever beampiezoelectric accelerometer.The model is then verified using FEM analysis for a range of different cases. Further,the model was validated by comparing the induced voltages of an accelerometer estimated using this model withexperimental voltages measured in the accelerometer after fabrication. Subsequently, the design of an accelerometeris demonstrated for SHM applications using the analytical model developed in this work. The designed accelerometerhas 60 mV/g voltage sensitivity and 2.4 pC/g charge sensitivity, which are relatively high values compared to those ofthe piezoresistive and capacitive accelerometers for SHM applications reported earlier.
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