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Rajeevan, N E,Kumar, Ravi,Shukla, D K,Thakur, P,Brookes, N B,Chae, K H,Choi, W K,Gautam, S,Arora, S K,Shvets, I V,Pradyumnan, P P IOP Pub 2009 Journal of physics, an Institute of Physics journa Vol.21 No.40
<P>We report the near-edge x-ray absorption spectroscopy (NEXAFS) at the Co/Mn L-3,L-2 edge and oxygen K edge of the well-characterized Bi-substituted Co2MnO4 multiferroic samples. The evolution of peak features in NEXAFS spectra of the Co/Mn L-3,L-2 edge and O K edge show the Bi-induced redistribution of magnetic cations (Co/Mn). The variation in valence states of Co and Mn in all the substituted compositions is consistent with the observed ferrimagnetic behaviour of the samples. Magnetization data show the decrease in molecular field complementing the ferrimagnetism. The role of Bi in the enhancement of magnetic interactions as well as the appearance of ferroelectricity in BixCo2-xMnO4 (0 <= x <= 0.3) is discussed.</P>
Effect of proton irradiation on electrical properties of a-As<sub>2</sub>S<sub>3</sub>
Gautam, S.,Thakur, A.,Shukla, D.K.,Shin, H.J.,Chae, K.H.,Singh, K.P.,Goyal, N. North-Holland 2011 Journal of non-crystalline solids Vol.357 No.11
This paper reports the effect of proton irradiation on the electrical properties of a-As<SUB>2</SUB>S<SUB>3</SUB> in the temperature range of 323-418K and frequency range 0.1-100kHz. The variation of transport property is studied with proton irradiation dose (1x10<SUP>13</SUP>ions/cm<SUP>2</SUP> and 1x10<SUP>15</SUP>ions/cm<SUP>2</SUP>). It has been observed that proton irradiation changes the dc conductivity (σ<SUB>dc</SUB>), dc activation energy (ΔE<SUB>dc</SUB>) and ac conductivity (σ<SUB>ac</SUB>(ω)). The σ<SUB>dc</SUB> and σ<SUB>ac</SUB>(ω) increases with dose of proton irradiation. The value of frequency exponent (s) decreases with the temperature and irradiation dose. These results are explained in terms of change in density of defect states in these glasses.
Synchronization and Operation of Parallel Inverters using Droop Control
L. K. Sahoo,N. D. Thakur,K. Rai,P Sensarma,R. D. Jha,P. Mohanty,A Sharma 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
To obtain a continuous power supply Distributed Generation (DG) with a Decentralized Power System (DPS), i.e. replacing a single UPS unit with multiple, smaller units in parallel, is emerging as new paradigm. The technically challenging aspect of DPS is the synchronization of inverters and load sharing among the parallel connected inverters. In this paper, a control method is proposed and implemented for synchronization and parallel operation of inverters. Droop control method has been used for equal power sharing, and design of power control loop. The design issues for voltage control loop are analyzed with the discussion of relative stability of the system. A current control loop is designed and analyzed to provide synchronization between the inverters.