Zobrazeno 1 - 10
of 88
pro vyhledávání: '"Luís Guerra Rosa"'
Autor:
Gonçalo Domingos, José Carlos Garcia Pereira, Pedro Alexandre Rodrigues Rosa, José Rodríguez, Luís Guerra Rosa
Publikováno v:
Energies, Vol 16, Iss 9, p 3927 (2023)
This work demonstrates that the quasi-homogeneous distribution of concentrated solar flux is achievable by using double paraboloid reflection, with a primary reflector to concentrate the sunlight, and a secondary reflector to homogenise the radiation
Externí odkaz:
https://doaj.org/article/875439bed2374403b5cc957b319bae8f
Publikováno v:
Applied Sciences, Vol 12, Iss 15, p 7521 (2022)
The ornamental stone industry has always played an important role in the world economy. Polishing the slabs to increase their gloss is important to enhance the beauty and richness of these natural materials. Many industrial polishing machines rely on
Externí odkaz:
https://doaj.org/article/4f8dea93ebcd4e279238908f36f766d6
Autor:
Luís Guerra Rosa, Guilherme De Almeida, José Carlos Garcia Pereira, Alejandro Martínez-Hernández, José González-Aguilar
Publikováno v:
Materials, Vol 15, Iss 4, p 1511 (2022)
After being adequately captured and concentrated, solar radiation can be conducted by optical fiber bundles/cables and directly used for illumination (lighting) or heating of confined spaces, or indirectly used by converting it in other forms of ener
Externí odkaz:
https://doaj.org/article/f5d958719d0b4340922daf936eeced3d
Publikováno v:
Materials, Vol 14, Iss 14, p 3988 (2021)
A type of disc-on-plate test methodology was used to determine the wear behavior of metallic binders employed in the manufacturing of diamond impregnated tools. The disc consists of a special circular wheel that allows the binder materials alone (i.e
Externí odkaz:
https://doaj.org/article/49ec19e81658449dba74fe9e253672c1
Autor:
Luís Guerra Rosa, José Carlos Garcia Pereira, Kaveh Rahmani, Guilherme De Almeida, Luís F. Santos
Publikováno v:
Applied Sciences, Vol 11, Iss 11, p 5174 (2021)
This work compares the performance of optical lenses made of silica glass or borosilicate glass (BK-7) when submitted to high-flux radiation emitted by a xenon arc lamp or provided by a high-concentration solar tower. Each irradiation test lasted for
Externí odkaz:
https://doaj.org/article/e8c39e97baa54d288a8ca82f3592ba43
Autor:
Nobumitsu Shohoji, Fernando Almeida Costa Oliveira, José Galindo, José Rodríguez, Inmaculada Cañadas, Jorge Cruz Fernandes, Luís Guerra Rosa
Publikováno v:
ChemEngineering, Vol 5, Iss 2, p 19 (2021)
Using a high-flux solar furnace, loosely compacted powders of Va-group transition metal (V, Nb, and Ta) were reacted with stream of NH3 gas (uncracked NH3 gas) being heated by concentrated solar beam to a temperature (T) range between 600 and 1000 °
Externí odkaz:
https://doaj.org/article/e84f365c473644e19593d166be9c2119
Publikováno v:
Metals, Vol 11, Iss 5, p 730 (2021)
Porosity is a characteristic present in most sintered materials, full densification only being achieved in special cases. For some sintered materials, porosity is indeed a desired characteristic, serving for the intended application of the material.
Externí odkaz:
https://doaj.org/article/46f30ece49b4468395ba3fbadc7d2187
Publikováno v:
Energies, Vol 14, Iss 7, p 1828 (2021)
Solar radiation homogenizers are multi-mirror devices that try to reshape the solar radiation distribution coming from a concentrator, so that, after passing through the homogenizer, the light flux becomes as much evenly distributed as possible. The
Externí odkaz:
https://doaj.org/article/ddbba5bf5e6d431c835ca67783bf1504
Publikováno v:
Energies, Vol 13, Iss 2, p 433 (2020)
Comparisons between experimental data and ray-tracing simulation results are presented for the high-flux SF60 solar furnace available at the Plataforma Solar de Almeria, Spain, which has an estimated thermal power of 60 kW. Since an important issue i
Externí odkaz:
https://doaj.org/article/59264cd3ca5b4f2ab0ef00539e586f98
Solar Heat for Materials Processing: A Review on Recent Achievements and a Prospect on Future Trends
Autor:
Luís Guerra Rosa
Publikováno v:
ChemEngineering, Vol 3, Iss 4, p 83 (2019)
Considering works published in the literature for more than a decade (period from January 2008 till June 2019), this paper provides an overview of recent applications of the so-called “solar furnaces”, their reactors, process chambers and related
Externí odkaz:
https://doaj.org/article/7990df8a1c4a4e0c8f7c17fa4687caa5