Design of an innovative sanitation system for bike-sharing service.

The concept of a novel sanitization device specifically designed for helmets used in bike share services is presented in this scientific work. The system uses ozone, a powerful oxidizing agent, to completely remove dust and bacteria from the helmet surface. Throughout the development process, special attention has been paid to the dual initial goals of efficacy in removing dirt and batteries, as well as ease of use related to the device's safety. In fact, today's sharing services are rarely capable of providing adequate disinfection of the tools, which is especially troubling given the most recent years of pandemic caused by Covid-19. The invention of the ozone-based sanitization device addresses the growing concern about hygiene and safety in bike share services. Furthermore, due to its portability and ease of use, the device is a cost-effective and viable solution for use in a variety of settings. A significant contribution to the advancement of sanitization technology and public health is expected with this work.

Stress-Based Lattice Structure Design for a Motorbike Application.

Background: The "drive by wire" mechanism for managing the throttle is not applied to every modern motorcycle, but it is often managed through a steel wire. Here, there is a cam on the throttle control. Its shape allows the throttle opening to be faster or slower and its angle of rotation, required for full opening, to be greater or less. The maximum angle a rider's wrist can withstand depends on numerous musculoskeletal mobility factors, often limited by falls or surgery. Methods: Using a Progrip knob with interchangeable cams allows the customization of a special cam profile, to ensure the best engine response to throttle rotation and ergonomics for the rider. The use of FEA software and lattice structures, allows to realize a lightweight and efficient design, targeted for fabrication with additive manufacturing technologies. Results: The cam was manufactured by exploiting MSLA technology. Finally, a dimensional inspection procedure was performed before assembly. The main result is to have obtained a lighter and cheaper component than the original. Conclusions: This study has allowed the design of a mechanical component consisting of innovative shape, light weight, and ergonomics. Furthermore, it demonstrates the effectiveness in the use of lattice structures to enable weight optimization of a component while minimizing the increase in its compliance.

Molds with Advanced Materials for Carbon Fiber Manufacturing with 3D Printing Technology.

Fused Deposition Modeling (FDM) 3D printing is the most widespread technology in additive manufacturing worldwide that thanks to its low costs, finished component applications, and the production process of other parts. The need for lighter and higher-performance components has led to an increased usage of polymeric matrix composites in many fields ranging from automotive to aerospace. The molds used to manufacture these components are made with different technologies, depending on the number of pieces to be made. Usually, they are fiberglass molds with a thin layer of gelcoat to lower the surface roughness and obtain a smooth final surface of the component. Alternatively, they are made from metal, thus making a single carbon fiber prototype very expensive due to the mold build. Making the mold using FDM technology can be a smart solution to reduce costs, but due to the layer deposition process, the roughness is quite high. The surface can be improved by reducing the layer height, but it is still not possible to reach the same degree of surface finish of metallic or gelcoat molds without the use of fillers. Thermoplastic polymers, also used in the FDM process, are generally soluble in specific solvents. This aspect can be exploited to perform chemical smoothing of the external surface of a component. The combination of FDM and chemical smoothing can be a solution to produce low-cost molds with a very good surface finish.

[Stress, job satisfaction, and quality of life in the health professions: the role of burn-out and personality features]. / Stress, soddisfazione lavorativa e qualità della vita nei Servizi: il ruolo del "burn-out" e le caratteristiche di personalità.

Emotional exhaustion, depersonalisation and personal achievement represent the main dimensions of the "burn-out syndrome" (B.O.). The risk of B.O. is especially elevated among people working in helping professions. These professionals work in settings that are characterised by a very strong emotional involvement. The representative sample of this study consisted of 100 subjects of whom a part of them worked in a psychiatric setting and others who didn't. All of them have been assessed through the M.B.I. and the E.P.Q. The purpose of the present study was especially: 1) to explore the existence of B.O. and its level, and 2) to verify the existence of some personality characteristics of employees which could be considered as possible predictors of B.O. syndrome. The statistical analysis showed that the three B.O. dimensions and therefore the B.O. syndrome were within the group of persons working in helping professions. The outcomes of this study encouraged an intervention focused on three parts: job organisation, self-management of psychological well-being and teamwork effectiveness.