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Self-Awareness Tool for Renewable Energy Production in Mixed-Use Urban Tissues: Incubators European Project for the Mediterranean Region
No full textDrawing on the Incubators of Public Spaces project, funded by JPI Urban Europe, this chapter considers the methods and tools used to support individuals', groups', organisations' and enterprises' self-ability to evolve towards grassroots interventions in urban regeneration processes. In particular, the chapter focuses on the assessment of the rational use and sustainable production of energy in mixed-use urban tissues, especially located in the Mediterranean region. Everywhere in Europe and beyond, the on-going increase in the rational use of energy is changing urban spaces and raising citizens' awareness about energy. In the Mediterranean climate region - characterized by warm to hot, dry summers and mild to cool, wet winters - some strategies have already proven effective and replicable. Moreover, if we take as reference a mixed-use urban tissue, containing dwellings, production buildings, services and open spaces, unexploited synergies between different uses open a number of further opportunities (e.g. the plane roof of a neighbourhood supermarket can easily accommodate photovoltaic panels for the supply of electricity to residential buildings). In particular, this chapter addresses the topic of renewable energy production potential of a Mediterranean mixed-use urban tissue with regard to its relationships with the local energy demand, with further issues of environmental sustainability (i.e. embodied energy, daylight, transportation energy), and with the role of citizens' self-interest actions. Indeed, the Incubators interactive and Web-based platform is designed to provide intuitive feedback about energy balance and cost savings. It provides guidance to tackle path-breaking energy issues on the building, neighbourhood and city scales so as to synergically attain the utmost environmental benefit
Overview on Additive Manufacturing Technologies
No full textThis paper provides an overview on the main additive manufacturing/3D printing technologies suitable for many satellite applications and, in particular, radio-frequency components. In fact, nowadays they have become capable of producing complex net-shaped or nearly net-shaped parts in materials that can be directly used as functional parts, including polymers, metals, ceramics, and composites. These technologies represent the solution for low-volume, high-value, and highly complex parts and products
Advertisement Delivery and Display in Vehicular Networks: Using V2V Communications for Targeted Ads
No full textAdvertisement delivery is expected to play a crucial role in future vehicular networks. In this paper, we address such a problem in vehicular networks, where advertisements (ads) can be broadcasted by roadside units (RSU) as well as vehicles, and then displayed to interested users. We describe the advertisement dissemination process by means of an optimization model that aims at maximizing the number of ads that users display within the target area and validity period of the ad. We then solve the optimization problem, obtaining the optimal scheduling strategy that RSUs and vehicles should adopt for ad broadcasting. Our study highlights the important role that vehicle-to-vehicle communication will have in ads delivery. Also, it shows how coexisting vehicular and cellular networks can effectively complement each other, with vehicular networks being a very efficient means for pervasive ad dissemination
Photolatent base catalyzed Michael-addition and concomitant in situ graphene oxide reduction to obtain electrically and thermally conductive UV-cured composite
No full textSensorless active magnetic dampers for the control of rotors
No full textThe aim of this paper is to present self-sensing Active Magnetic Dampers (AMDs) for the vibration control of rotating machines and evaluate their performance and advantages with respect to standard sensed solutions. The technique is implemented on a rotor reproducing the typical dynamic behaviour of an aero-engine gas turbine shaft. The proposed technique is based on a Luenberger observer that estimates the mechanical states of the system. The observed states are fed back in closed-loop to introduce damping into the system and to reduce the vibrations during critical speed crossing. The rotordynamic and electromechanical modeling is illustrated taking into account the anisotropy of rotor elastic supports. The control design is described along with a sensitivity analysis on the most critical model parameters and a study of electromagnet nonlinear effects on the closed loop behaviour. The importance of the inherent collocation in the self-sensing configuration during control design is discussed analysing modal shapes and sensor/actuator transfer functions. A phase of experimental identification of actuator parameters is performed on the open-loop system response to improve the reliability of the model. The effectiveness of the proposed method is evaluated experimentally by measuring unbalance response in open and closed-loop configuration showing a reduction of displacement during critical speed crossing from 0.35 mm to 0.04 mm. Furthermore, a classical AMD realized with the use of position sensors is implemented on the same rotor. The results obtained with sensed and self-sensing controls are compared to show the good quality of the damping performance reached with the proposed self-sensing technique
Processing and surface treatments for pseudoelastic wires and strands
No full textThe aim of this work is a preliminary investigation of the manufacturing process of Ni-Ti and Ni-Ti-Cr wires and strands to be applied in mechanical applications. The diamond wires for stone cutting were used as a case study. A prototype of multiwire Ni-Ti strand has been prepared, characterized and thermally treated in this research. The pseudoelastic strands have not been widely investigated in the literature to date, and they are not available in the market with this size (final diameter in the 1-2 mm range). A mechanical characterization (tensile and three-point bending tests), as well as surface analysis (scanning electron microscopy [SEM], X-ray photoelectron spectroscopy [XPS], Energy Dispersive X-ray Spectrometry [EDS], dynamic wettability), of a single wire and multiwire strand was performed. Moreover, different surface treatments to be used during the manufacturing process have been tested for improving the adhesion of a polymeric coating (polyurethane) as protection against abrasion and as the binding element of the diamond beads assembled on the strand. The surfaces were treated by mechanical roughening and different chemical modifications (acid and peroxide etching) and characterize
