Search

A grid-supportive two-stage three-phase three-wire solar photovoltaic (SPV) system is presented in this paper, wherein a boost converter is used as a first stage to serve the function of maximum power point tracking and a three-leg voltage source converter is used to feed the extracted SPV energy, along with the supporting distribution system for improvement in the power quality. The harmonics elimination, grid currents balancing, and compensation for nonactive part of the load currents are extra features offered by the proposed system other than conventional features of the solar inverter. The true power reflecting part of the load current is estimated using an improved adjustable step adaptive neuron-based control approach. Moreover, a feed-forward term is added as photovoltaic (PV) array contribution to grid currents, which helps in fast dynamic response due to ambience changes. The output of which is a current component reflected on grid side to instantaneously regulate the dc-link voltage. In the proposed approach, the load, PV array, and loss contributions are kept decoupled. The feasibility of the proposed control algorithm is confirmed via experimental results.

Computer Forensics is a science of seeking evidence found in computers and digital storage media. The main challenge before computer forensic investigatorsis to examine digital media with the aim of finding, collecting, preserving, recovering, analyzing and presenting facts about digital information and guaranteeing its accuracy and reliability.It is said that, "Once it is has been deleted it is gone forever!" This statement is not true. Deleted files can actually be recovered if effort to do so is made shortly after deletion. There are several tools and methods by which we can easily recover our data and get our data as it is back. This paper includes the various methods and tools to recover data from Hard Disk Drive (HDD), how data recovery tools works, in what situation you can lost your data permanently and in what conditions you can recover your data back. You can know about types of damages and techniques by which data can be recovered by this paper. This paper gives a glance of various methods used to recover data from Hard Disk Drive (HDD) and their corresponding forensic approach done by the computer forensic experts in the perspective of recovery.

COVID-19, caused by SARS-CoV-2, has spread globally. Coinfection with other endemic viruses is likely to complicate the clinical presentation and outcome. Information on clinical manifestations and management strategies on COVID-19 coinfection with endemic diseases in children is yet to evolve. The risk of dengue infection exists in 129 countries and it is endemic in more than 100 countries. The SARS-CoV-2 pandemic might overlap with the dengue epidemics in tropical countries. We report the first paediatric case to the best of our knowledge of COVID-19 encephalitis with dengue shock syndrome. This clinical syndrome could be attributed to serological cross-reactivity, incidental coinfection or perhaps a warning for dengue-endemic regions to face the unique challenge of differentiating and managing two disease entities together. Enhanced understanding of potential COVID-19 and dengue coinfection warrants immediate attention of researchers and international health policy makers.

This paper deals with a three phase grid supportive kind of PV generation system. The proposed system is said grid supportive as it not only feeds the energy generated by solar PV system intro the grid but also helps at power quality improvement front of distribution system. A two stage topology is proposed, wherein the first stage is a boost converter which extracts the energy from the PV array and the second stage is a grid interfaced VSC (Voltage Source Converter). The VSC feeds extracted solar energy into the grid along with harmonics elimination, reactive power compensation and grid currents balancing. An improved adjustable step adaptive neuron based control approach is used for estimation of average power consuming component of load current. Moreover, a feed forward term is added as PV array contribution to grid currents, which helps in fast dynamic response due to ambience changes. The DC link voltage is regulated using a PI controller on DC link of the VSC. The output of PI controller is designated as loss component of system. In the proposed approach, the load, PV array and loss contributions are kept decoupled. The experimental results confirm the feasibility of the proposed control algorithm. The THD (Total Harmonics Distortion) of grid currents has been found well under IEEE-519 standard even under nonlinear loads at CPI (Common Point of Interconnection).