Search results for "Small"
showing 10 items of 2441 documents
A sustainable energy production: Sea Wave in the small island of Ustica (Italy)
2018
Nowadays the electrical energy production is based on fossil fuels in the greatest part of smaller islands in the Mediterranean Sea. Despite the availability, the renewable energy sources are practically unused, as landscape constraints. So, the paper presents the case of study of Ustica, a small island located at north of Sicily, in the middle of Mediterranean Sea. Starting with the analysis of the electrical energy consumption of public buildings, the paper suggests an energetic scenario, based on solar and sea wave. In particular, in order to use this new resource, the paper presents an innovative wave energy converter. Finally, the energetic and economic evaluations encourage the realiz…
A novel soft-stall power control for a small wind turbine
2017
In this paper, the problem of Soft-stall power control design for a small wind turbine is considered. Passive stalling and furling methods are widely used to limit the output power of small wind turbines at above-rated wind speed conditions. However, these methods have substantial limitations, for instance, related to tracking the maximum power at some wind speed levels, limited variable speed operation and introducing unbalanced forces on wind turbine blades. Soft-stall power control is a promising technique to overcome above limitations and improve the performance of small wind turbines. Small wind turbines have a comparatively low moment of inertia value, and it is possible to make fast …
Evaluating the Performances of Small Wind Turbines: A Case Study in the South of Italy
2012
AbstractAmong renewable energy resources, wind energy became more attractive in the last decade. Wind farms installations dramatically increased in areas where climatic conditions, topography and environment have allowed their development. The installation of wind turbines, usually carried out in remote areas, recently began to cover areas identified by a complex terrain such as urban and suburban zones. Although these new sites’ choices are characterized by lower productivity there is increasing interest in wind energy production in both urban and suburban area. In this work the authors have carried out an energy analysis developed from a sample of small wind turbines available on the mark…
Evaluation of the optimal renewable electricity mix for Lampedusa island: The adoption of a technical and economical methodology
2020
Abstract Worldwide, the majority of small islands not connected to the main grid is still dependent on fossil fuels. From an economic and environmental point of view, this condition is no more sustainable given the high costs for electricity generation and the high level of pollutant emissions. Furthermore, the dependence on fossil fuel represents a risk for the security of the supply of several small developing Countries since they are obliged to import those resources from foreign Countries. The introduction of renewable energy sources in small islands represents a valid solution to solve these problems. In this context, the paper investigates the case of Lampedusa, a small Italian island…
Reliability results of straylight measurements using the C-Quant
2008
Purpose Assessment of repeatability and reproducibility of straylight measures with the C-Quant straylightmeter (Oculus AG, Germany), effect of age on reliability measures and correlation of measures determined with new methods of scatter determination. Methods Results from different studies will be presented. For repeatability assessment, 20 eyes (age 26.9±2.7 years) were examined with the C-Quant, taking 10 consecutive readings. 5 subjects were also examined on 5 consecutive days to assess reproducibility. Repeated measures from 84 subjects, age range 19-86 years, were analysed to assess the effect of patient’s age. Software was developed to quantify scatter from centroid patterns obtaine…
Abitare la transizione nei Centri minori in Sicilia
2023
The proposal aims to develop concrete experience on possible ways of living from a framework of national and international references on the theme of the Social Housing Community to define a specific methodology on strategies to be tested on the theme of residence temporary in small towns in Sicily. The provision of minimum and adequate space for short and long periods of welcome is thus intended for new temporary residents (returning young people, migrant families, the elderly, travellers in transit) which can also be used to meet the needs of migrants, under the public direction of the municipal administration. The issue of residency is back in the disciplinary debate after the health eme…
Valledolmo 2030: la città che cura
2022
The small towns can become the places to reactivate the rural areas of our country through essential factors starting from the natural and cultural heritage, from social inclusion, from psycho-physical well-being, helping to reverse the unstoppable phenomenon of the flight of young people. The current Covid-19 emergency has revealed the crucial role of health, not only in terms of health facilities, but also in new ways to feel better, spend more free time outdoors, eat healthily and boost the economies of Local communities. It is in this context that the research-action project of the research group and the LabCity Architecture degree laboratory aims to investigate the theme of the city th…
Resilience in small urban centers with a strong historical connotation
2015
La resilienza della città storica, misurata dagli eventi rispetto a calamità naturali e fenomeni emergenziali, si presenta spesso al di sopra di qualunque aspettativa. Soprattutto quando principio insediativo, trasformazioni consequenziali a calamità e ridondanze hanno di fatto aumentato la coping capacity e la capacity of response del costruito storico rendendole elevate e di significato. Nonostante ciò la necessità di implementazione di nuove qualità, nell’ottica di riappropriazione dei patrimoni urbani disseminati nel territorio e spesso abbandonati o poco popolati, pone il bisogno di retrofit, manutenzione e misure gestionali che incrementino sicurezza e resilienza. Potendosi indubbiame…
Inelastic neutron scattering measurements on Nd2Fe14B and Y2Fe14B single crystals
1992
Abstract Inelastic neutron scattering measurements have been carried out on Nd 2 Fe 14 B and Y 2 Fe 14 B single crystals. Temperature dependent acoustic magnon dispersion curves have been found along the high-symmetry directions [0,0,1] and [1,0,0] with a gap at (0,0,2). Soft mode behaviour at spin wave vector q = 0 was observed for Nd 2 Fe 14 B near the spin reorientation temperature. The inelastic scattering intensity decreases steeply for larger q . Therefore, the dispersion curves could be measured until the middle of the Brillouin zone only. The experimental results are discussed in the frame of a classical spin wave model.
Small Island developing states: Overview about wind, solar and marine energy in Cuba
2019
The current economic, political, and social trends in Cuba indicate that energy sector will change in the future. The energy consumption will increase and Cuba, like most island nations, lacks a large energy resource base and satisfies most of its energy needs with imported fossil fuels. The aim of this work is a summary of renewable energy sources (solar, wind, bioenergy and marine) presented in the island and the development in the next society of the future.