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An attempt is made here to capture some aspects of Tagore’s philosophy of education including those bearing on education in colonial India of his time. The outlooks he expounded on, led the educated classes of British India of his time to think and act outside the shackles of colonialism. Tagore’s educational philosophy and practice is outlined by delineating its liberating influence in the evolution...
This paper presents a novel self-starting low-voltage step-up DC-DC converter for energy harvesting from ultra-low-power and low-voltage energy sources. The proposed structure consists of two stages: the first stage is an autonomous oscillator, which provides the self-start-up capability with low-input voltages, and the second stage is a controllable reverse conventional buck-boost converter. The...
This paper presents a novel low voltage DC/DC boost converter for energy harvesting from ultra-low power energy sources. The proposed converter has a simple structure consisting of two stages: an autonomous oscillator in the first stage enabling self-starting of converter and a controllable reverse buck-boost converter in the second stage. Simulation results and experimental tests proved that this...
This paper presents design and analysis performed for a dual winding electric machine. Windings of the machine are concentrated type so that electrical and magnetic isolation is maintained. For this reason, the proposed structure could be a reasonable candidate for fault tolerant applications. As required by some applications (electric accessory drive system (EADS) for hybrid electric vehicles), simultaneous...
Concentrated windings, in other words fractional slot windings are getting popular because of many proven advantages. In this study, a concentrated winding electric machine is designed for industrial applications. Although, in concentrated winding, mutual coupling between two adjacent coils is assumed to be zero, finite element analysis indicates that significant coupling may exist. Studies indicate...
Underwater Wireless Sensor Networks (UWSNs) provide a solution for monitoring those unstable environments which is considered frightening for human presence. These networks are mostly formed by acoustic sensor nodes and surface sinks called buoys that are connected to any onshore control centre. The reliable delivery of sensed data to the surface sink is a challenging task as compared to forwarding...
Providing an efficient communication for the underwater wireless sensor networks is a significant problem due to the unique characteristics of such environments. Radio signal cannot propagate well in deep water, and we have to replace this with the acoustic channel. This replacement results in many issues like high latency due to less propagation speeds, low bandwidths and high error probability....
The principle of operation of the switched reluctance motor (SRM) drive demands that the motor and converter be treated as one unit. The control of the SRM is very important and difficult. The motor's double salient structure makes its magnetic characteristics highly nonlinear. The motor flux linkage appears to be a nonlinear function of stator currents as well as rotor position. This paper deals...
The switched reluctance motor (SRM) is an old member of machine family. Its simple structure, ruggedness, and inexpensive manufacturability make them attractive for industrial applications. This paper presents an equivalent circuit model for switched reluctance motor. Its linear model and dynamics are discussed in detail. Parameters and its approximate equivalent circuit are obtained by using linear...
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