We present the evaluation of the induced voltages in a lossless single transmission line, located at a given height over an infinite conductivity ground plane, and exited by an external field due to a step current moving along a vertical channel. This is a classic topic of the theory of lightning-induced voltages on power lines. The technical literature related to this topic has performed a significant effort; however, only approximated formulas have been obtained so far. In this paper, we derive the exact closed-form solution. We also will discuss, evaluate, and compare the approximated formulas with reference to the proposed exact one, thus contributing to clarifying a matter that still is debated and sometimes misleading, as we will show in the paper. We furthermore recall that the examined lightning-induced voltages model is fundamental for the IEEE standard 1410, a guide for improving the lightning performance of power distribution line.

Small and medium sized enterprises (SMEs) assure economic growth in Europe. Generally, many SMEs are struggling to survive in an ongoing global recession and are often reluctant to release or pay for staff training. Cloud Computing offers many opportunities and could help companies to improve their business and use technology more efficiently In this chapter, learning methods particularly E-Learning in European SMEs is described in part 1. In this paper a short presentation of Cloud Computing and advantages for SMEs (part 1), the objectives of the European project IN-CLOUD (part 2) and the work in progress within this project are presented

The Industry 4.0 paradigm and all its connected technologies (Big Data, Internet of Thing, Artificial Intelligence, Cloud Computing, Machine Learning, Augmented Reality, etc.) are quickly and deeply impacting on the companies' organization and technical capability. Although it is commonly accepted that the “digital shift” is an essential requirement for the companies' competitiveness, the Industry 4.0 paradigm has also introduced several relevant changes in the competences and skills of employees and managers, that may be a bottleneck in the adoption of the Industry 4.0 model. Some initiatives have been created at European level to support the education in the context of Industry 4.0. In this paper we present a selection of them, focusing in particular on the innovative didactic methodologies adopted in each different initiative.

We report on a fiber-coupled, quartz-enhanced photoacoustic spectroscopy (QEPAS) near-IR sensor for sequential detection of methane (CH₄ or C1) and ethane (C₂H₆ or C2) in air. With the aim of developing a lightweight, compact, low-power-consumption sensor suitable for unmanned aerial vehicles (UAVs)-empowered environmental monitoring, an all-fiber configuration was designed and realized. Two laser diodes emitting at 1653.7 nm and 1684 nm for CH₄ and C₂H₆ detection, respectively, were fiber-combined and fiber-coupled to the collimator port of the acoustic detection module. No cross talk between methane and ethane QEPAS signal was observed, and the related peak signals were well resolved. The QEPAS sensor was calibrated using gas samples generated from certified concentrations of 1% CH₄ in N₂ and 1% C₂H₆ in N₂. At a lock-in integration time of 100 ms, minimum detection limits of 0.76 ppm and 34 ppm for methane and ethane were achieved, respectively. The relaxation rate of CH₄ in standard air has been investigated considering the effects of H₂O, N₂ and O₂ molecules. No influence on the CH₄ QEPAS signal is expected when the water vapor concentration level present in air varies in the range 0.6–3%.

3D printing is an increasingly popular technology, finding practical applications in many sectors. In addition to technical uses, the use of 3D printing as a support tool in education is also spreading. Benefits include greater student involvement, the ability to visualize and better understand theoretical concepts, the integration of practical and theoretical skills. The areas of employment are many, from cultural heritage to medicine, from science to mechanics. However, to use this technology successfully, trainers need to have (or acquire) specific skills and competences. The current document intends to present the results of a study conducted in the framework of the European project “3D Printing in VET” on the current uses of 3D printing in education and on the point of view of the sector's stakeholders on this topic.