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RISS 인기검색어
- 검색키워드
- 저자 : Mahapatro, A K (검색결과 4 건)
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Vibration-Based Monitoring and Diagnosis of Dielectric Charging in RF-MEMS Switches
Jin Woo Lee,Mahapatro, A K,Peroulis, D,Raman, A IEEE 2010 Journal of microelectromechanical systems Vol.19 No.6
<P>Dielectric charging due to metal-dielectric contact is one of the major modes of failure in capacitive radio frequency microelectromechanical systems (MEMS) switches, and it leads to actuation voltage fluctuations and, eventually, to device failure. Failure prognostics for such devices require novel methods to monitor the extent and location of trapped parasitic charges on or in the dielectric layer. Motivated by the success of resonant electrostatic force microscopy for mapping local trapped charges, we present in this paper a technique that monitors the resonance frequencies of multiple eigenmodes of the bridge conductor of the switch as a means to detect parasitic charges and nonuniformities in electric fields in the switch that could arise from nonuniform parasitic charge distribution. Both theory and experiments are presented to demonstrate the technique. Moreover, its potential advantages and limitations as a new diagnostic tool for MEMS health monitoring are discussed.</P>
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Shukla, D.C.,Varshney, V.P.,Gupta, P.S.P.,Mahapatro, B.B. Asian Australasian Association of Animal Productio 1994 Animal Bioscience Vol.7 No.1
The relationship of thyroid status and certain blood biochemical constituents with body weight gains (ADG) and age (13 to 96 weeks) was studied in Holstein Friesian ${\times}$ Hariana ($1/2F{\times}1/2H$) crossbred male calves by assessing their plasma triiodo thyronine ($T_3$), Thyroxine ($T_4$), sodium, potassium, total proteins and cholesterol level at two energy levels. Body weight gains (ADG) were higher during the 50 to 72 weeks of age and declined thereafter, the plasma $T_3$ conc. was aignificantly (p < 0.01) higher during this period compared to all other periods. There was no significant variation due to energy level. Overall mean plasma $T_3$ conc. was $1.19{\pm}0.12ng/ml$. Plasma $T_4$ conc. did not show any significant variation either between the different age periods or between the two energy levels. The mean plasma $T_4$ conc. was $37.34{\pm}1.32ng/ml$. The plasma sodium and potassium concentration did not vary significantly due to energy levels. But amongst the different age periods, sodium concentration was highest ($147.70{\pm}2.29mEq/L$) during 49-60 weeks of age and lowest ($134.70{\pm}1.78mEq/L$) during 13-24 weeks, where as for potassium concentration changes were nonsignificant. There was very little variation amongst other periods. Plasma protein level was higher at 100% energy level than at 75%. Amongst the different age period, it was significantly lower ($6.44{\pm}0.36$) during 13 to 24 weeks of age than at 37 to 48 weeks of age ($7.14{\pm}0.11$). Plasma cholesterol values were higher for 75% energy level than that of 100%. Between the periods it was highest during 61 to 72 weeks of age and the difference amongst the age period were highly significant.
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Ramazan Asmatulu,Zeinab Veisi,Md. Nizam Uddin,Anil Mahapatro 한국섬유공학회 2019 Fibers and polymers Vol.20 No.5
Highly sensitive, reliable and practical detection of Cyclooxygenase-2 (COX-2) as an important enzyme in painbiomarkers, inflammation, and cancer cell proliferation is of great importance. This study demonstrates the feasibility ofdeveloping nanobiosensor (or biosensor) platforms for sensitive COX-2 biomarker detection from phosphate buffer saline(PBS) and human serum samples. Highly porous polyaniline nanofibers were fabricated in four different average diametersusing electrospinning process. They were then integrated as the main sensing component into interdigitated goldmicroelectrodes to develop label-free electrochemical nanobiosensors. The performance of the nanobiosensors was evaluatedin comparison with a plain control biosensor using electrochemical impedance spectroscopy (EIS). Significant improvementwas observed in the sensitivity of the nanofiber-based biosensors revealing the remarkable capability of electrospunpolyaniline nanofiber in robust and rapid detection of the COX-2 biomarker. The fabricated nanofiber-based biosensors wereable to detect the target antigen with concentrations as low as 0.01 pg/ml in PBS and human serum samples, respectively. High sensitivity, as well as remarkable selectivity towards COX-2 analyte, suggested the excellent potential of this nanofiberbasedplatform for reliable COX-2 analyte detection.
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