Results 11 to 20 of about 661,571 (355)
The Positronium state in quartz [PDF]
physica status solidi c, 2009 AbstractThe positronium state in quartz is described by a linear superposition of two states: the first describing the free positron in the crystal and the second corresponding to a positronium Bloch wavefunction in the lattice. The condition for positronium formation in the electron gas is deduced by using variational calculations of the positron ...
P. M. Platzman, Bernardo Barbiellini
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Reconfigurable Supply Chain Selection: Literature Review, Research Roadmap and New Trends
Applied Sciences, 2023 The COVID-19 pandemic revealed weaknesses in the global supply chain management. With stock-outs, transportation problems and the bullwhip effect caused by ever-changing demand, it is necessary for decision-makers to review their supply chain ...
Slim Zidi +3 more
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Geometry-controlled phase transition in vibrated granular media
Scientific Reports, 2022 We report experiments on the dynamics of vibrated particles constrained in a two-dimensional vertical container, motivated by the following question: how to get the most out of a given external vibration to maximize internal disorder (e.g.
René Zuñiga +2 more
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Energies, 2021 In this work, we represent a shunt active power filter (SAPF) based on a serial three-phase flying capacitor multilevel inverter (FCMI) controlled by a Petri Nets representation (PNs). This structure is chosen for its significant performances.
Sana Othman +4 more
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Security Threats in Intelligent Transportation Systems and Their Risk Levels
Risks, 2022 Intelligent Transport Systems (ITSs) are part of road transportation sector evolution and constitute one of the main steps towards vehicle automation.
Besma Zeddini +2 more
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Friction factor from velocity profiles in smooth turbulent channel flows [PDF]
E3S Web of Conferences, 2022 Fluid dynamics plays an important role in many Renewable energies studies, i.e. wind and tidal turbines, wave energy geothermal and solar power, …). Friction factor f is an important parameter for the determination of pressure drop in different processes
Payet-Taille Hélène +2 more
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Optimized Fractional Order Based Droop Control with Improving the Flexibility of a Microgrid [PDF]
E3S Web of Conferences, 2022 This work presents an improved four-levels hierarchical control strategy for flexible microgrid based on three-phase voltage source inverters (VSIs) connected in parallel.
Hadjaidji Fatma-Zohra +2 more
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Integrated Design Methodology of Automated Guided Vehicles Based on Swarm Robotics
Applied Sciences, 2021 In recent years, collaborative robots have become one of the main drivers of Industry 4.0. Compared to industrial robots, automated guided vehicles (AGVs) are more productive, flexible, versatile, and safer.
Khalil Aloui +4 more
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Modelling the reduction of quartz in a quartz–carbon pellet
Journal of Engineering Mathematics, 2023 AbstractTraditional refining of silicon generates carbon dioxide emissions that are released into the atmosphere. An alternative process under experimental exploration uses quartz particles coated in a layer of porous carbon as the raw material, instead of lumps of quartz and carbon.
Metherall, B +4 more
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