Results 21 to 30 of about 809,725 (419)

Modeling and Control Design Based on Petri Nets Tool for a Serial Three-Phase Five-Level Multicellular Inverter Used as a Shunt Active Power Filter

open access: yesEnergies, 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
doaj   +1 more source

Friction factor from velocity profiles in smooth turbulent channel flows [PDF]

open access: yesE3S 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
doaj   +1 more source

Geometry-controlled phase transition in vibrated granular media

open access: yesScientific 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
doaj   +1 more source

Security Threats in Intelligent Transportation Systems and Their Risk Levels

open access: yesRisks, 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
doaj   +1 more source

Optimized Fractional Order Based Droop Control with Improving the Flexibility of a Microgrid [PDF]

open access: yesE3S 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
doaj   +1 more source

Quartz Glass [PDF]

open access: yesScience, 1906
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Day, A. L., Shepherd, E. S.
openaire   +2 more sources

Integrated Design Methodology of Automated Guided Vehicles Based on Swarm Robotics

open access: yesApplied 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
doaj   +1 more source

QuaRTz: An Open-Domain Dataset of Qualitative Relationship Questions [PDF]

open access: yesConference on Empirical Methods in Natural Language Processing, 2019
We introduce the first open-domain dataset, called QuaRTz, for reasoning about textual qualitative relationships. QuaRTz contains general qualitative statements, e.g., “A sunscreen with a higher SPF protects the skin longer.”, twinned with 3864 ...
Oyvind Tafjord   +3 more
semanticscholar   +1 more source

QHAR: Q-Holonic-Based ARchitecture for Self-Configuration of Cyber–Physical Production Systems

open access: yesApplied Sciences, 2021
Production systems must be able to adapt to increasingly frequent internal and external changes. Cyber-Physical Production Systems (CPPS), thanks to their potential capacity for self-reconfiguration, can cope with this need for adaptation.
Douha Macherki   +5 more
doaj   +1 more source

Crystallization of GeO2 thin films into alpha-quartz: from spherulites to single crystals [PDF]

open access: yesActa Materialia 215 (2021) 117069, 2020
Piezoelectric quartz SiO2 crystals are widely used in industry as oscillators. As a natural mineral, quartz and its relevant silicates are also of interest of geoscience and mineralogy. However, the nucleation and growth of quartz crystals is difficult to control and not fully understood.
arxiv   +1 more source

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