1,721,080 research outputs found
Studio, disegno e realizzazione di una famiglia modulare di prese e accessori per impianti TV-SAT
Full text linkAntropologia della mobilità e spazi dell'immaginario. Un'etnografia urbana sui "migranti in piroga" e non-migranti nel Senegal contemporaneo
No full textStarting from the question on how ‘mobility’ is experienced and described in Senegalese context (the migrants country of origin), the PhD research aims to examine the relationship between mobility, space and imagination, their role in the social construction of migratory dimension. This purpose is pursued by looking at the phenomenon of “clandestine” pirogue migrants to Canary Islands and the experiences of non-migrants (relatives of migrants, neighbourhood friends, people professionally involved in touristic activities) in the peripheries of Dakar and the touristic urban areas of Mbour-Saly. Considering the strong influence of tourism in these latter places, part of the work aims to deepen the social transformations triggered by the tourism (tourist actors), and the role that it plays among the residents, and to what extend it gives meaning to images, narrations and daily practices through which these people grow their desir de l'Ailleurs, and build up the social representation of the Elsewhere. On the other hand, the research explores the historicity of migratory processes and the specific ‘culture of migration’, by focusing the attention on the social practices, the organizational logics, the choices, as well as on the representations and practices of inclusion/exclusion that the migrants or ‘candidates to migration’ endure within the urban areas and in relation to the social contexts wherein they get into
DESIGN OF A NEW HIGH-END STREET BIKE
Full text linkThis paper deals with an ???atypical??? bike design. It can be considered atypical due to the materials used and the peculiar engine ??? chassis combination. The project was born as a consequence of the manufacturing company desire to access a niche motorcycle market.
The project is about a new bike with an adequate family feeling with the factory style, totally customizable; it will be a large capacity, naked sporty two-seater, with innovative design and a very good handling.
In the paper the entire design process leading to the presentation will be briefly explained
On the design and testing of a research device about streaming water phenomena
Full text linkThe Group of Mechanical Design of the University of Brescia was charged with the task to develop, and design a large scale facility aimed to perform tests about streaming water phenomena, the final user being the Group of Civil Hydraulics of the same University. The facility has been designed, developed and successfully tested.
It is mainly composed with a sub-horizontal channel, flat bottomed and transparent walled. The cross area of the streaming flow can be reduced and the slope can be controlled (0 to 7°).
Very severe requirements were foreseen with respect to smoothness and planarity (0.5 mm Vs 12 m length and 700 mm width). Acceptable deformations were limited to very slight values, although the length of the channel being remarkable and the expected loads being widely variable, due to the relevant range of foreseen speeds and flow rates of streaming water (sand and small stones transport by stream had been foreseen too).
To guarantee the required flatness along the whole channel a modular design has been adopted and proper means to adjust the fitting between contiguous modules have been developed. Notice the sealing must not be compromised in adjusting phase.
A mobile support free to be moved along the channel has been designed in order to allocate a number of measuring probes devoted to hydraulic phenomena monitoring.
An inlet tank was designed too, equipped with proper devices to guarantee a smooth and waveless inlet of water in the whole range of foreseen flow rates (up to 220 litres/s). An output tank was equipped with proper piping and pumping items to re-circulate the fallen water. Of course devices to precisely modify the slope rate were developed too. The facility has been installed and is nowadays in use for scientific and teaching purposes.
In the proposed paper the following items will be dealt with: exact design requirements definition, study and design phases, solid modelling of the plant, building, trials and delivery, some considerations about using geometric and dimensional tolerancing (GD&T) on machine with relevant measures
DESIGN OF A FACILITY TO HOST MICRO-ORGANISMEXPERIMENT IN SPACE
No full textThe current state of the space journeys offers the possibility of executing experiments in orbit in order to use the
microgravity environment for scientific investigations. In the world of the space programs both American and
European agencies offer the possibility of disposing of spaces arranged to accommodate some sets of scientific
experiments.
Several research activities are developing on the possibility of disposing of such spaces. The ESA (European
Space Agency) is developing a new kind of Facility to be put at disposal of the international scientific
community. Such Facility will be constituted, in synthesis, by a system of two centrifuge each containing 4 sites
with suitable interfaces for experiments.
This will allow to realise any gravity condition, between zero and the terrestrial gravity, or to execute
comparative tests. The Facility offers a reduced space (about 60x60x100mm) for every scientific experiment.
The abstract describes the study and the preliminary design of an equipment to be stored in this space, which
executes the operations of cultivation (feeding, washing Etc..). of a series of samples of colonies of basic
organisms
Electric Traction Set for a light car
Full text linkThis paper deals with the feasibility study of a special electric traction wheel-set for a micro-car for disabled customers. In our university department some solutions on the topic had already been developed in the past. The design has not been carried out in a sequential way, but it has been lead in “concurrent-engineering” style and it has been speeded up thanks to the employment of solid modelling. The 3D design technology has helped in a very efficient way to take into account the impact of any modification on any component to the neighbouring items. The following topics have been considered: design for disabled customers, maximum ease of use and low cost technology.
This job therefore has coped the main problems related to designing a new car. Some innovative solutions have been proposed and an overall design procedure has been experienced.
This paper in particular describes the results of a research activity connected with the study of the general lay-out of such a wheel set. Some different configurations were explored, each showing its strong and weak points. It is to point out that, while the traditional arrangements connected with gasoline or diesel engines were hugely studied, with the electric traction all the wheel sets must be reshaped. In fact too many car designers tend to use the same lay-out used before, wasting much of the potential advantages offered by electric motors.
During this study some radically new designs were explored, for example not using any live axle for transmission or trying to use thrust ball bearing for steering axles.
In the following a gallery of proposed and studied solutions will be exposed, showing the most characteristic points.
We developed the study and design phases starting from some specifications: the group must be composed by electric motor (geared or not), brake, wheel hub, front or rear traction, in case of front traction the group must have steering pivots (attachments for steering rods).
This apparatus has been designed to be used in a light car (which is under development in our faculty). However the proposed design may fit even standard city cars.
Design goals were: 1) Keeping very low steering radius (intended use in city environment) 2) Absence of traditional suspension system (our light car has some innovative design in this) 3) Respect of Ackermann geometry.
Some different design solution have been developed and are exposed in the paper. The most relevant feature is that every wheel has its own motor, so achieving a dramatic reduction in encumbrance
- …
