Abstract: In low power renewable systems, a single phase grid-connected converter is usually adopted. This paper deals with a single stage transformer less single phase converter for micro grid applications with PV system is proposed. By using this system the maximum power tracing is possible from PV array to the micro grid. The maximum power point tracing is maintained with a logical controller. A proportional controller is used to control the current injected into the grid a single-phase, single-stage current source inverter based photovoltaic system for grid connection. A double-tuned parallel resonant circuit is designed to attenuate harmonics at the inverter dc side. It helps to improve the power quality and system efficiency. A modified carrier based modulation technique for the current source inverter is studied to magnetize the dc-link inductor and to control the switching pattern for the single phase grid-connected CSI. The operation of Single Phase Transformer-less grid connected PV system is verified by the Simulation and experimental results show the effectiveness of the proposed solution.
Keywords: Distributed power Generation, DC- AC power conversion, current source inverter grid- connected converters, Single - phase systems, current source converters, Maximum power point tracing (MPT).
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Abstract: Here authors present MarCONI (Multi Channel One haNd Interface), a system born to control remotely piloted aircrafts (RPAs), in particular multi-rotors, by means of new generation peripherals. Among those, used in personal computing environment, a generation of 6 degree-of-freedom (DOF) advanced controllers is the SpaceMouse family by 3Dconnexion. MarCONI is a hardware-software system, acting as a bridge between the USB peripheral and the UAV's radio-controller. A shaping block has been added to the system in order to process raw data flow generated by the SpaceMouse. This step allows the user to adapt the controller feedback to the specific vehicle features and response. Shaping parameters are fully customizable by a specific Web GUI, accessible through a Wi-Fi connection, making possible the setup tuning by means of mobile devices, such as smartphones or laptops. A side benefit of this system is the possibility to pilot UAVs using one hand only, with no restriction.
Keywords: 3D USB HID, Arduino, Drone, FPV, Multi-rotor, RPA, SpaceMouse, SpaceNavigator, UAV.
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Abstract: The fields of machine learning and mathematical optimization increasingly intertwined. The special topic on supervised learning and convex optimization examines this interplay. The training part of most supervised learning algorithms can usually be reduced to an optimization problem that minimizes a loss between model predictions and training data. While most optimization techniques focus on accuracy and speed of convergence, the qualities of good optimization algorithm from the machine learning perspective can be quite different since machine learning is more than fitting the data. Better optimization algorithms that minimize the training loss can possibly give very poor generalization performance. In this paper, we examine a particular kind of machine learning algorithm, boosting, whose training process can be viewed as functional coordinate descent on the exponential loss. We study the relation between optimization techniques and machine learning by implementing a new boosting algorithm. DABoost, based on dual-averaging scheme and study its generalization performance. We show that DABoost, although slower in reducing the training error, in general enjoys a better generalization error than AdaBoost.
Keywords: Machine Learning, Optimization, Boosting, AdaBoost, computational learning theory.
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Abstract: The durability of concrete has been a major concern of civil engineering professionals over the last few decades. Durability is the capacity of concrete to resist deterioration caused by aggressive environments. An experimental investigation was carried out to evaluate the durability properties of blended cements prepared from substitution of SRC with different percentages of GGBFS up to 75 mass, %. The ingredients of each dry mix were homogenized, and then hydrated with the water of standard consistency. The specimens were cured under tap water for 28 days (zero time), then immersed in marine environment up to 12 months. The hydration products were analyzed using DTA, IR and XRD techniques. The durability properties were determined by measuring: free lime, combined water, bulk density, compressive strength, total sulfate and total chloride contents for each mix at different immersing ages. The results revealed that, GGBFS decreases the accessibility of SO42- and Cl- to penetrate into the pore system. Hence the total sulfate and total chloride contents decrease. Therefore, the durability performance of SRC is greatly enhanced by the use of high GGBFS contents. The composite cements containing 45-55 mass, % of GGBFS are comparable to or outperform SRC up to one year of immersion in aggressive water.
Keywords: Blended Cements; GGBFS; SRC; Durability; Bulk density and Compressive strength.
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