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Nyctanthes arbor tristis (NATE) ethanol extract (150 mg/kg, orally) was evaluated for its protective effect against scopolamine-induced (1 mg/kg i.p.) cognitive impairments in rats using behavioral models like radial arm maze test, Morris water maze test and active avoidance test. NATE effect was evaluated and compared with the standard piracetam (200mg/kg i.p.). NATE (p<0.005) significantly reversed...
The tuning of PSS parameters for satisfactory power system response over a wide range of operating conditions requires an efficient robust optimization technique. This paper presents a novel concept of integrating the Taguchi robust design principle with particle swarm optimization (PSO) for the PSS design. The objective is to build an intrinsic robustness in the design of PSS over a wide range of...
This paper describes how a free circuit simulation software can assist in teaching the principles of power electronics to undergraduate students. The authors have used Solver for EQuations with User defined ELements (SEQUEL) as an aid to teaching basic power electronics course to undergraduate students at the authors' institute. Using SEQUEL as an aid in teaching-learning process has increased students'...
This paper presents an empirical investigation into WCDMA uplink (UL) transmit power for various indoor/outdoor locations. Specifically, the statistics of UL transmit power measured in different locations over a commercial UMTS network are provided and compared. Similar locations are then grouped to form four practical mobile usage scenarios, and their empirical probability distribution functions...
In this paper, we present an experimental analysis of uplink (UL) transmit power in WCDMA networks based on measurement data over a commercial UMTS network. In particular, three factors which may influence the transmit power profiles in practical mobile usage scenarios are examined: (a) handset position, (b) channel effects, and (c) network loading. First, a handset under test is placed at different...
The intermittent nature of wind draws its attention for reliability evaluation to penetrate more in conventional power system. This paper presents a case study on reliability evaluation of three wind farms in North Karnataka region. The main objective of this study is to identify a reliable site based on the wind data analysis of historical wind speeds using Weibull distribution. The study illustrates...
Power system stabilizer (PSS) is used to damp out local mode oscillations of synchronous generators. PSS are usually designed to provide a proper phase lead which is load dependent. Thus, PSS parameters have to be adjusted at each operating condition. A novel robust PSS design based on Taguchi principle is presented in this paper that can properly function over a wide range of operating conditions...
Photovoltaic (PV) water pumping systems have been increasingly popular in remote areas where grid is not accessible or is too costly to install. These systems are mostly used for agriculture and household purposes. Generally, such systems use permanent magnet dc motors because of their simple circuit configuration and control strategy. However these systems require frequent maintenance. On the other...
In this paper, a UPF power conditioner for an optimal extraction of output power from grid connected variable speed wind energy conversion system (VSWECS) is presented. The system consists of a variable speed wind turbine coupled to a permanent magnet synchronous generator (PMSG) through a gear box, two PWM power converters and a maximum power point tracker (MPPT). Output power from PMSG is first...
In this paper, a procedure is proposed to estimate the optimum wind turbine generator speed parameters to yield higher energy production at higher capacity factor, using normalized power curve based on Weibull probability density function of wind speed data and taking into account variation of power coefficient and blade parameters of a wind turbine
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