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Approximate Equivalent-Circuit Modeling and Analysis of Type-Ⅱ Resonant Immittance Converters
Mangesh Borage,K. V. Nagesh,M. S. Bhatia,Sunil Tiwari 전력전자학회 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.2
Resonant immittance converter (RIC) topologies can transform a current source into a voltage source (Type-I RICs) and vice versa (Type-II RICs), thereby making them suitable for many power electronics applications. RICs are operated at a fixed frequency where the resonant immittance network (RIN) exhibits immittance conversion characteristics. It is observed that the low-frequency response of Type-II RINs is relatively flat and that the state variables associated with Type-II RINs affect the response only at the high frequencies in the vicinity of the switching frequency. The overall response of a Type-II RIC is thus dominated by the filter response, which is particularly important for the controller design. Therefore, an approximate equivalent circuit model and a small-signal model of Type-II RICs are proposed in this paper, neglecting the high-frequency response of Type-II RINs. While the proposed models greatly simplify and speed-up the analysis, it adequately predicts the open-loop transient and small-signal ac behavior of Type-II RICs. The validity of the proposed models is confirmed by comparisons of their results with those obtained from a cycle-by-cycle simulation and with an experimental prototype.
Characterization of wafer-scale MoS2 and WSe2 2D films by spectroscopic ellipsometry
Mangesh S. Diware,박규남,문지훈,박한결,Won Chegal,조용재,조현모,박주상,김형준,강상우,김영동 한국물리학회 2017 Current Applied Physics Vol.17 No.10
Here, we present the spectroscopic ellipsometry investigation of synthetically grown wafer-scale twodimensional (2D) MoS2 and WSe2 films to access quality and thickness uniformity. MoS2 and WSe2 samples were grown by chemical vapor deposition and atomic layer deposition, respectively. Complex dielectric function (ε ¼ ε1 þ iε2) and thickness information of these 2D films were extracted from the measured data using multilayer optical calculations. Broad spectral range (1.2e6 eV) and multiple angles of incidence were used to reduce correlations among fitting parameter. Lineshape of ε of MoS2 and WSe2 monolayer films are consistent with literature but shows higher values, suggests better quality of our samples. Eight-inch wafer size MoS2 monolayer sample shows ~ 70% uniformity with an average thickness of 0.65 ± 0.2 nm, and three-layer WSe2 sample of 8 『 1 cm2 area shows ~ 80% uniformity with an average thickness of 2.5 ± 0.4 nm. Our results will be helpful to accelerate commercialization process of 2D devices.
( Mangesh D. Pustode ),( Bhupendra Dewangan ),( V. S. Raja ),( Neeta Paulose ),( Narendra Babu ) 한국부식방식학회(구 한국부식학회) 2016 Corrosion Science and Technology Vol.15 No.5
DC potential drop technique was employed during the slow strain rate tests to study the hot salt stress corrosion crack (HSSCC) initiation at 300 and 400 °C. Threshold stresses for HSSCC initiation were found to about 88 % of the yield strength at both temperatures, but the time from crack initiation to final failure (Δtscc) decreased significantly with temperature, which reflects larger tendency for brittle fracture and secondary cracking. The brittle fracture features consisted of transgranular cracking through the primary α grain and discontinuous faceted cracking through the transformed β grains.
Microwave Assisted Extraction of Ursolic Acid and Oleanolic Acid from Ocimum sanctum
Mangesh D. Vetal,Revati S. Chavan,Virendra K. Rathod 한국생물공학회 2014 Biotechnology and Bioprocess Engineering Vol.19 No.4
Present study deals with the microwave assistedextraction (MAE) of ursolic acid (UA) and oleanolic acid(OA) from Ocimum sanctum leaves. UA and OA havebeen reported to possess significant medicinal properties. Various experimental parameters such as selection ofsolvent, solvent composition, irradiation time, microwavepower, solid to solvent ratio, preleaching time and numberof cycles were investigated to optimize the extractionprocess. Under optimum conditions of irradiation time(3 min), microwave power (272 W), solid to solvent ratio(1:30), preleaching time (10 min), maximum UA and OAhas been extracted in one extraction cycle with ethanol:water (80:20) as a solvent. Maximum 86.76 and 89.64% ofUA and OA was extracted under above mentioned optimizedexperimental conditions. MAE was also compared with thebatch and ultrasound assisted extraction (UAE) method. Ascompared to batch and UAE, higher extraction yield ofthese important phytochemicals have been obtained throughMAE in only 3 min.
Approximate Equivalent-Circuit Modeling and Analysis of Type-II Resonant Immittance Converters
Borage, Mangesh,Nagesh, K.V.,Bhatia, M.S.,Tiwari, Sunil The Korean Institute of Power Electronics 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.2
Resonant immittance converter (RIC) topologies can transform a current source into a voltage source (Type-I RICs) and vice versa (Type-II RICs), thereby making them suitable for many power electronics applications. RICs are operated at a fixed frequency where the resonant immittance network (RIN) exhibits immittance conversion characteristics. It is observed that the low-frequency response of Type-II RINs is relatively flat and that the state variables associated with Type-II RINs affect the response only at the high frequencies in the vicinity of the switching frequency. The overall response of a Type-II RIC is thus dominated by the filter response, which is particularly important for the controller design. Therefore, an approximate equivalent circuit model and a small-signal model of Type-II RICs are proposed in this paper, neglecting the high-frequency response of Type-II RINs. While the proposed models greatly simplify and speed-up the analysis, it adequately predicts the open-loop transient and small-signal ac behavior of Type-II RICs. The validity of the proposed models is confirmed by comparisons of their results with those obtained from a cycle-by-cycle simulation and with an experimental prototype.
Role of Yoga in the Management of Premature Ejaculation
Anjali Mangesh Joshi,Raveendran Arkiath Veettil,Sanjay Deshpande 대한남성과학회 2020 The World Journal of Men's Health Vol.38 No.4
Premature ejaculation (PE) is a common male sexual problem. Various non-pharmacological and pharmacological treatment options are available currently. The importance of yoga in the management of various sexual dysfunctions is increasingly recognized. In this review, we are analyzing the role of yoga in the management of PE. This paper explores the mechanism of yoga practices in the management of PE and the recommended yoga practice for PE. It also discusses the scientific evidence of yoga practices, such as yoga postures (yogasana), breathing practices (pranayama), lock (bandha), gestures (mudra), relaxation, Aum chanting, yoga nidra and meditation with particular reference the management of PE.
Magnetically Assembled Multisegmented Nanowires and Their Applications
Bangar, Mangesh A.,Hangarter, Carlos M.,Yoo, Bongyoung,Rheem, Youngwoo,Chen, Wilfred,Mulchandani, Ashok,Myung, Nosang V. WILEY-VCH Verlag 2009 Electroanalysis Vol.21 No.1
<P>Here we report a cost effective and versatile way of synthesizing and assembling multi-functional (e.g., gold-polypyrrole-nickel-gold) nanowires. Multisegmented nanowires were synthesized using electrodeposition method for precise control over segment dimensions for proper expression of material functionality. The nanowires were integrated on microfabricated electrodes using magnetic dipole interactions between the ferromagnetic segment in the nanowire and the ferromagnetic electrodes. The electrical properties of multisegmented nanowires showed semiconducting behavior with the activation energy of ca. 0.27 eV for the conducting polymer segment of the nanowire. These nanowire devices showed response towards light and exposure to ammonia, demonstrating their potential use as photonic device and gas sensor, respectively.</P>
Investigation of InSb Critical-point Energies at 25 K by Using Spectroscopic Ellipsometry
김태중,황순용,최준호,변준석,Mangesh S. Diware,Han Gyeol Park,김영동 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.3
We report dielectric function data from 0.74 to 6.6 eV for InSb at 25 K obtained using spectroscopic ellipsometry. The values of the critical-point (CP) energies were determined from numerically calculated second energy derivatives of the data. The CP structures are blue shifted and significantly sharpened relative to those at room temperature (RT). The <i>E<i>1, <i>E<i><sub>1</sub> +Δ<sub>1</sub>, <i>E<i>'<sub>0</sub>, Δ<sub>5</sub><sup>cu</sup> −Δ<sub>5</sub><sup>vu</sup>, <i>E<i>'<sub>0</sub> +Δ'<sub>0</sub>, and Δ<sub>5</sub><sup>cl</sup>-Δ<sub>5</sub><sp>vu</sup> CP structures are clearly observed at energies below 4 eV. We also report the <i>E<i><sub>2</sub>, <i>E<i>'<sub>2</sub> , <i>E<i><sub>2</sub> + Δ<sub>2</sub>, <i>E<i>'<sub>2</sub> + Δ<sub>2</sub>, <i>E<i>'<sub>1</sub>, <i>E<i>'<sub>1</sub> + Δ'<sub>1</sub>, and <i>E<i>'<sub>1</sub> + Δ'<sub>1</sub> + Δ<sub>1</sub> features in the <i>E<i><sub>2</sub> − <i>E<i>'<sub>1</sub> energy range of 4 to 6 eV. These cannot be resolved at RT, but are clearly separated at 25 K. In particular, several CPs in the E02 and the E01 + 01 + 1 transitions have not previously been observed.