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Il presente capitolo è incentrato su uno dei nuovi paradigmi di produzione e consumo, l’economia circolare – i.e., “un’economia in cui gli scarti e l’inquinamento sono minimizzati grazie al design consapevole di prodotti, processi e servizi, il valore delle risorse è mantenuto il più a lungo possibile e i sistemi naturali vengono rigenerati” (Gusmerotti et al., 2020, p. 9). L’elaborato si focalizza in particolare su uno dei modelli di business considerati “circolari” (CBM) (Linder e Williander, 2017), il product-as-a-service (PaaS da qui in poi) (Lacy et al., 2016). Alla base di questo modello di business vi è l’idea che i clienti non acquisiscono la proprietà dei beni, bensì li utilizzano al pari dei servizi, a fronte di un pagamento, come riporta la letteratura concernente i product-service systems (PSS) (Lacy et al., 2016; Mont, 2002; Tukker e Tischner, 2006; Tukker, 2015). Questo approccio al consumo rientra nel più complesso fenomeno della servitizzazione, la quale comporta “l’innovazione nelle capacità e nei processi di un’impresa, in modo che essa possa meglio creare valore – per il cliente e l’impresa stessa – passando dalla vendita di prodotti alla vendita di sistemi di prodotto-servizio” (Neely, 2009, p. 10).
Parametric anti-resonance is a phenomenon that occurs in systems with at least two degrees of freedom; this can be achieved by periodically exciting some parameters of the system. The effect of this properly tuned periodicity is to increase the dissipation in the system, which leads to a raising in the effective damping of vibrations. This contribution presents the design of an open-loop control to reduce the settling time using the anti-resonance concept. The control signal consists of a quasi-periodic signal capable of transferring the system’s oscillations from one mode to another mode of the system. The general averaging technique is used to characterize the dynamics, particularly the so-called slow dynamics of motion. With this analysis, the control signal is designed for the potential application of a microelectromechanical sensor arrangement; for this specific example, up to 96.8% reduction of settling time is achieved.
The paper shows concepts of optical splitting based on three dimensional (3D) optical splitters based on multimode interference principle. This paper is focused on the design, fabrication and characterization of 3D MMI splitter with formed output waveguides based on IP-Dip polymer for direct application on optical fiber. The MMI optical splitter was simulated and fabricated using direct laser writing process. Output characteristics were characterized by highly resolved near-field scanning optical microscope (NSOM) and compared with 3D MMI splitter without output waveguides.
In this paper, we document optical splitters based on Y-branch and also on MMI splitting principle. The 1×4 Y-branch splitter was prepared in 3D geometry fully from polymer approaching the single mode transmission at 1550 nm. We also prepared new concept of 1×4 MMI optical splitter. Their optical properties and character of output optical field were measured by near-field scanning optical microscope. Splitting properties and optical outputs of both splitters are very promising and increase an attractiveness of presented 3D technology and polymers.
Die bösen Zehn
(2010)
ROS 2 in Embedded Systemen
(2022)
Das Robot Operating System in seiner zweiten Version (ROS 2) findet zunehmend Verwendung und das nicht nur in Robotern. Dieser Beitrag gibt einen Überblick über den Aufbau und die Funktion von ROS 2. Die wesentlichen Elemente werden vorgestellt, das Publish-Subscribe-Konzept, das der Kommunikation zugrunde liegt, wird erläutert. Die Anforderungen von ROS 2 an Hardware und Betriebssystem werden beleuchtet und es werden Betrachtungen zu dessen Echtzeitverhalten gemacht.