17 documents found, page 1 of 2
Physical-Mechanical Changes in Portuguese, Greek, and Italian Marbles Under Agi...
Pires, Vera; Sitzia, Fabio; Dias, Luis; Mirao, José; Neves, SamuelBowing, a significant form of decay, poses a crucial challenge in the preservation of historical and contemporary structures, necessitating comprehensive study and analysis. This research focuses on the mechanical alterations induced by aging cycles of temperature and moisture on three distinct marbles—Portuguese, Greek, and Italian— emphasizing their susceptibility to bowing-associated effects. The prevalence ...
Trentepohlia Algae as a Diagnostic Tool for Historic Mediterranean – style Houses
Sitzia, Fabio; Pires, Vera; Lisci, Carla; Neves, Samuel; Mirao, JoséTrentepohlia is a genus of filamentous chlorophytes green algae commonly found in association with fungi and bacteria on building envelopes. Their colonies have a characteristic red colouration which results from the production of b-carotene and hematochrome pigments. They are commonly present on walls, roofs and other external building structures and thrive in humid and shaded environments where sufficient moi...
Marble façades structural decay due to bowing – A comprehensive review
Pires, Vera; Stizia, Fabio; Mirão, José; Lopes, Luís; Dias, Luís; Neves, SamuelNatural stone has been used in façades for centuries. Initially, stone elements were rather thick when used as construction elements, and the durability was appropriate. Scientific research on the properties of marble began in the late 19th century. In the following years, the thickness of natural facade stones decreased from over 1000 mm (as in construction elements) to 20-50 mm (in cladding applications) beca...
Radiação solar global em Portugal e a sua variabilidade mensal e anual
Cavaco, Afonso; Silva, Hugo; Canhoto, Paulo; Neves, Samuel; Neto, Jorge; Collares-Pereira, ManuelConhecer a disponibilidade solar é essencial para analisar a viabilidade dos projetos de produção de energia solar. Para responder a essa necessidade, o Instituto Português de Energia Solar, o Instituto de Ciências da Terra da Universidade de Évora e o Instituto Português do Mar e da Atmosfera uniram-se num estudo de grande relevância para o setor que é apresentado em primeira mão na “renováveis magazine”.
EliMAC: Speeding Up LightMAC by around 20%
Dobraunig, Christoph; Mennink, Bart; Neves, SamuelUniversal hash functions play a prominent role in the design of message authentication codes and the like. Whereas it is known how to build highly efficient sequential universal hash functions, parallel non-algebraic universal hash function designs are always built on top of a PRP. In such case, one employs a relatively strong primitive to obtain a function with a relatively weak security model. In this work, w...
Structural, physical and compositional proprieties analysis of mra arbles in a ...
Madrinha, João; Moreira, Noel; Lopes, Luis; Sitzia, Fábio; Mirão, José; Dionísio, Maria Amélia; Neves, SamuelThe application of scientific and technological research activities to innovation and to social and economic development is one of the great challenges of contemporary times. Such aspects are even more significant in the industrial sector, because the R&D activities can have a remarkable impact on the sustainable production of raw materials and on the economic viability of companies. Indeed, the development of ...
4DCT versus 4DPET/CT na avaliação do movimento respiratório no planeamento da r...
Dias, Paulo; Neves, Samuel; Raminhas Carapinha, Maria João; Caetano, MarcoIntrodução – Uma das abordagens terapêuticas no carcinoma do pulmão de não pequenas células (CPNPC) é a quimioterapia e radioterapia (RT) concomitante. O planeamento de RT pode ser realizado com base em diferentes técnicas de imagem, existindo vários fatores que podem influenciar a qualidade das mesmas, nomeadamente o movimento respiratório. Objetivos – Este estudo tem como objetivos: 1) avaliar a importância d...
DETECTION OF FRACTURE PLANES BY GEORADAR IN A GRANITE QUARRY
Neves, Samuel; Mirão, José; Lopes, Luís; Alves, Tiago; Lisci, Carla; Pardal, Eduardo; Martins, RubenNo sector da extração de pedra natural, em particular no granito, mármore e calcário, vive-se um bom momento económico. Contudo, face às novas exigências técnicas, ambientais e de segurança, é necessário que sejam disponibilizadas informações úteis e em tempo útil, de modo a responder às necessidades dos profissionais do sector. Neste sentido, é fundamental o desenvolvimento de métodos e metodologias científica...
4DCT versus 4DPET/CT in the assessment of respiratory motion in radiotherapy pl...
Dias, Paulo; Neves, Samuel; Carapinha, Maria João Raminhas; Caetano, MarcoIntroduction – One of the therapeutic approaches in non-small cell lung carcinoma (NSCLC) is concomitant chemotherapy and radiotherapy (RT). The planning of RT can be performed based on different imaging techniques, and several factors may influence their quality, including respiratory motion. Objectives – This study aims to: 1) assess the importance of 4DCT and 4DPET/CT for motion correction and target volume ...
The circulant hash revisited
Araújo, Filipe; Neves, SamuelAt ProvSec 2013, Minematsu presented the circulant hash, an almost-xor universal hash using only the xor and rotation operations. The circulant hash is a variant of Carter and Wegman’s H3 hash as well as Krawczyk’s Toeplitz hash, both of which are hashes based on matrix-vector multiplication over F2. In this paper we revisit the circulant hash and reinterpret it as a multiplication in the polynomial ring F2[x]/...