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Assessment of a fuzzy logic based MRAS observer used in a photovoltaic array supplied AC drive

Frontiers in Energy 2014年第1期8卷 81-89页

作者： bhavnesh kumar Yogesh K CHAUHAN Vivek SHRIVASTAVA School of Engineering Gautam Buddha University Greater Noida201310 India Electrical Engineering Department National Institute of Technology Delhi Delhi 110077 India

In this paper a fuzzy logic （FL） based model reference adaptive system （MRAS） speed observer for high performance AC drives is proposed. The error vector computation is made based on the rotor-flux derived from the reference and the adaptive model of the induction motor. The error signal is processed in the proposed fuzzy logic controller （FLC） for speed adaptation. The drive employs an indirect vector control scheme for achieving a good closed loop speed control. For powering the drive system, a standalone photovoltaic （PV） energy source is used. To extract the maximum power from the PV source, a constant voltage controller （CVC） is also proposed. The complete drive system is modeled in MATLAB/Simulink and the performance is analyzed for different operating conditions.

关键词： induction motor drive fuzzy logic (FL)control model reference adaptive system (MILAS) photo-voltaic (PV) array vector control

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An in vitro infection model system to study proteins expressed during interaction of mycobacterium with murine macrophages

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Advances in Bioscience and Biotechnology 2010年第3期1卷 180-184页

作者： Neelja Singhal Prashant Sharma bhavnesh kumar Utpal Sengupta Krishnamurthy Venkatesan Deepa Bisht 不详

Resurgence of mycobacterial diseases particularly tuberculosis has caused a renewed interest to unravel the strategies employed by mycobacteria for intracellular survival. In spite of advancement in mycobacterial research, our knowledge about genes and their corresponding functional proteins involved during the interaction of mycobacterium with host’s macrophages is fragmentary. This study pertains to development of a suitable in vitro model using murine macrophages and Mycobacterium bovis BCG to study proteins expressed during macrophage-myco bacterium interactions. Peritoneal macrophages from BALB/c mice were infected with M. bovis BCG and intracellular replication was assessed by {3H} thymi- dine uptake assay which was maximal when macrophage to mycobacterium ratio was 1:10. SDS-PAGE was employed to study the proteins expressed and selected proteins were subjected to mass spectrometry. Seven proteins found to be upregulated during macrophage-mycobacterium interaction were identified by MALDI-TOF. The results indicate that the present in vitro infection model was able to support the growth of M. bovis BCG in murine macrophages and is an ideal model to determine the pattern of functions of gene expression during the interaction of mycobacterium with macrophages. The differentially expressed proteins will help in understanding the mycobacterial molecular basis of adaptation to intracellular macrophage environment.

关键词： Tuberculosis Macrophages Model System Proteomics

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