1,303 research outputs found
Correction to: When terminology hinders research: the colloquialisms of transitions of control in automated driving (Cognition, Technology & Work, (2022), 10.1007/s10111-022-00705-3)
No full textIn the original article, author affiliation published with error. The correct affiliations are: Davide Maggi—Institute for Transport Studies, Leeds, UK. Richard Romano—Institute for Transport Studies, Leeds, UK. Oliver Carsten—Institute for Transport Studies, Leeds, UK. Joost C. F. De Winter—Faculty of Mechanical, Maritime and Materials Engineering, Delft University of Technology, Delft, The Netherlands. The original article has been corrected.Human-Robot Interactio
Admiel Kosman, Siamo giunti a Dio
No full textInternational audienceSix poems from Israeli poet Admiel Kosman translated from the Hebrew into Italian. Selection of poems, presentation of the author, translation and notes by Davide Mano
Admiel Kosman, Siamo giunti a Dio
No full textInternational audienceSix poems from Israeli poet Admiel Kosman translated from the Hebrew into Italian. Selection of poems, presentation of the author, translation and notes by Davide Mano
Novel correlation to evaluate the pressure losses for different traffic jam conditions in road tunnel
No full textThe main aim of the present work is to provide a novel correlation between different traffic jam conditions
(Filling Traffic Tunnel) in road tunnel and pressure losses, in order to calculate the thrust required to the jet fan
to induce the needed ventilation. The correlation refers to a longitudinal ventilation system of impulsive fans
placed in a road tunnel with a rectangular cross section. The data necessary to build the novel correlation here
proposed were obtained by means of 3-D model that was validated experimentally in previous studies. To
evaluate the influence on required ventilation thrust, several traffic jam conditions and different average air
velocities were considered. The proposed correlation provides pressure losses as function of FTT and average air
velocity in the tunnel. The pressure losses were evaluated as difference between the thrust required by the
ventilation system in empty tunnel conditions and the thrust required in traffic jam condition. The mean percentage error of the novel correlation here proposed is about of 3% respect to CFD simulation results.
Furthermore, a friction factor for different FTT was provided. It allows to evaluate the pressure losses due to the
traffic jam as distributed ones with an error value about of 3%
Starchitecture: Scenes, Actors and Spectacles in Contemporary Cities
No full textHow and why do spectacular buildings get commissioned and procured? What are their visible urban effects? What can urban planners, architects, and policymakers learn in order to engage in more successful citymaking?
In recent years, media and critical attention has been lavished on famous architects, and the contributions of their designs to the branding of cities. The post-“Bilbao effect” global landscape is one where cities compete for the highest-profile skyscrapers, cultural projects, and high-profile developments designed by star architects whom even casual readers know by first name: Frank Gehry, Bjarke Ingels, Jean Nouvel, Zaha Hadid, Norman Foster, Rem Koolhaas. Far less is known about the decision-making processes behind these projects and their subsequent urban effects.
A unique combination of urban studies and photography, Starchitecture investigates projects designed by star architects in cities including Paris, New York, Abu Dhabi, Bilbao, and the architectural microcosm of the Vitra campus in Weil am Rhein, Germany. Author Davide Ponzini and photographer Michele Nastasi seek to explain and critique a growing global condition by revealing how starchitecture has been and continues to be deployed in cities around the world. The arguments they raise are vital to understanding the urban landscapes of today, and tomorrow
Solar selective coatings for evacuated flat plate collectors: Optimisation and efficiency robustness analysis
No full textThree Cr2O3/Cr based multilayer coatings were designed, optimised, and sputter-deposited. The selective solar absorbers presented in this study were specifically considered for evacuated flat plate solar collectors (EFPCs) at working temperatures of 100, 200, and 300 °C. The film matrix method and genetic optimisation algorithm were used to simulate and optimise the coatings. Further, the robustness of the performance of the coatings related to the unpreventable errors in layer thickness during the manufacturing stage was incorporated as a binding parameter of the genetic algorithm. This solution allowed the optimisation to converge to the thickness package with the highest performance, thereby ensuring proper robustness for given errors in layer thickness. Thereafter, the robustness of the optimised coatings was analysed, consequently confirming an efficiency loss of less than 2% for layer thickness variation of up to ±20% from the optimal thickness value. The obtained values of solar absorptance as high as 0.97, and thermal emittance lower than 0.05 up to 300 °C, validated through measurements on the fabricated samples, are expected to provide unparalleled performances for the emerging technology of EFPCs
Performance of a CPC inserted in a high vacuum envelope
No full textEvacuated flat thermal systems equipped with a Compound Parabolic Concentrator (CPC) represent a solar thermal architecture useful to meet the growing world demand for mid-temperature heating. The performance of such a system could be improved by coating the inner side of the encapsulating glass with a selective InfraRed (IR) mirror. The underlying physical mechanism is the cold-side external photon recycling, which allows to recover the power radiated by the absorber and, consequently, to increase the solar thermal efficiency. By means of a thermal model and numerical simulations, here we demonstrate how the mirror sensibly influences the panel performance: despite a transmittance drop in solar wavelengths that affects the efficiency below 250 °C, efficiency increases are achieved at higher temperatures
A Selective Solar Absorber for Unconcentrated Solar Thermal Panels
No full textA new Selective Solar Absorber, designed to improve the Sun-to-thermal conversion efficiency at mid temperatures in high vacuum flat thermal collectors, is presented. Efficiency has been evaluated by using analytical formulas and a numerical thermal model. Both results have been experimentally validated using a commercial absorber in a custom experimental set-up. The optimization procedure aimed at obtaining Selective Solar Absorber is presented and discussed in the case of a metal dielectric multilayer based on Cr2O3 and Ti. The importance of adopting a real spectral emissivity curve to estimate high thermal efficiency at high temperatures in a selective solar absorber is outlined. Optimized absorber multilayers can be 10% more efficient than the commercial alternative at 250 °C operating temperatures, reaching 400 °C stagnation temperature without Sun concentration confirming that high vacuum flat thermal collectors can give important contribution to the energy transition from fossil fuels to renewable energy for efficient heat production
- …
