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Photovoltaic (PV) systems have been the focus of many scientific researches recently. The interest in grid-tied PV transformer-less inverters has increased rapidly, because of their higher efficiency and lower cost compared to traditional line transformer inverters. In this paper, a new modified transformer-less topology derived from H5 inverter is proposed. The proposed topology is equipped with...
The use of massive multiple input multiple output (MIMO) systems can improve the performance of energy efficiency and increase the capacity limits due to the improvement of the spatial correlation. The effect of the exponential correlation model on the massive MIMO energy and spectral efficiencies is investigated using a base station (BS) with a large number of antennas and a single antenna user terminal...
In this paper, a Two-Switch forward converter using enhancement mode Gallium Nitride transistors (GaN FETs) operating in CCM is designed for low power and high frequency applications. This topology provides a galvanic isolated, simple and efficient approach which will be suitable to use in battery charge circuits. The performance of the converter is evaluated using Si MOSFETs and GaN FETs. Comparison...
Background This study investigates the association between intimate partner violence (IPV) against women and its impact on child morbidity in the south Asian region. Methods The analysis uses logistic regression models with cross sectional nationally representative data from three countries - Bangladesh, India and Nepal. The data have been pooled from ‘Demographic and Health Surveys’ (DHS) of Bangladesh,...
Third Generation Partnership Project (3GPP) LTE has adopted OFDMA as the uplink multiple access scheme. One of the major drawbacks is the high PAPR. Not only is the performance of PAPR with PTS technique influenced by the number of subblocks and the phase vector but also by the subblock partitioning. The Partial Transmit Sequence (PTS) technique suffers from the search complexity of finding the optimum...
Mathematical models can be very useful for understanding complicated systems, and for testing algorithms through simulations that would otherwise be difficult or expensive to implement. A model has been devised that simulates the sound localization performance of normal hearing persons, and that is being further refined for simulation of performance of hearing-impaired persons wearing two cochlear...
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