23 documents found, page 1 of 3
Óleos naturais como substitutos do uso de xileno na etapa de diafanização do pr...
Pinto, Cátia; Loureiro, Inês; Bernardo, Luís; Borges-Ferro, AmadeuA técnica histológica envolve um conjunto de etapas para preparar tecidos para a análise microscópica, com recurso a vários reagentes, nomeadamente o Xileno, nocivo, problemático para a saúde e ambiente. Assim, é pertinente pesquisar formas de minimizar esta exposição. Neste sentido, realizou-se uma revisão sistemática sobre a substituição do Xileno no processamento histológico por um agente diafanizador de ori...
Experimental results for topologically optimised steel joints under tension
Ribeiro, Tiago; Bernardo, Luís; Nepomuceno, Miguel; Maugeri, Natale Antonio; Longo, Paolo; Domenico, Dario DeDevelopments on code-compliant Topology Optimisation methodologies for the steel construction industry have recently been proposed. Also, it has been found that topologically optimised steel bolted connection parts – which behave non-linearly to a very significant degree of damage – do not waive physically non-linear analyses to assess an ultimate capacity that can be lower than what is predicted by the optimis...
Experimental evaluation of the potential use of waste recycled concrete fine ag...
Pinto, Hugo; Nepomuceno, Miguel; Bernardo, Luís; Oliveira, Luiz Pereira deThe current concern with sustainability in the construction sector has led to the adoption of processes to minimise the impact on the environment. The use of recycled concrete aggregates in self-compacting concrete (SCC), as an alternative to natural aggregates, seems to be a solution with great potential. However, it is common knowledge that the use of recycled aggregates in the production of SCC instead of na...
Shear Testing of Topologically Optimised Web Cover Plates in Splice Connections...
Ribeiro, Tiago; Bernardo, Luís; Nepomuceno, Miguel; Maugeri, Natale Antonio; Longo, Paolo; Domenico, Dario DeTesting shear-resisting plates in steel connections is one of the most challenging laboratory undertakings in steel construction, as the most common experimental layout design includes simulating the connection with its adjoining members. This significant hindrance gained particular magnitude as the need to test prototypes of topologically optimised shear cover plates became more pressing. Indeed, new code-comp...
Cement-based grouts for masonry consolidation with high content of limestone fi...
Nepomuceno, Miguel C. S.; Bernardo, Luís; Oliveira, Luiz Pereira de; Timóteo, Rúben de OliveiraThis article reports an experimental research on the influence of high-volume mineral additions on the rheological, physical and mechanical properties of cement-based grout for stone masonry structures consolidation. Binary grout mixtures were produced by replacing 50% weight of cement by limestone filler, metakaolin, glass powder and ceramic waste. Grout flow properties, rheological parameters, bleeding water,...
A review on thermoplastic or thermosetting polymeric matrices used in polymeric...
Pinto, Deesy G.; Rodrigues, João; Bernardo, LuísRecent manufacturing advancements have led to the fabrication of polymeric composites (PC) reinforced with fibers. However, to reduce the impact on the environment, efforts have been made to replace synthetic fibers (SF) by natural fibers (NF) in many applications. NF, e.g., as banana fibers (BF) possess higher cellulose content, a higher degree of polymerization of cellulose, and a lower microfibrillar angle (...
Experimental Study on the Surface Properties of Nanoalumina-Filled Epoxy Resin ...
Pinto, Deesy; Amaro, Ana M.; Bernardo, LuísThis article presents an experimental study on the surface properties of epoxy resin nanocomposites (EPNCs) manufactured with a thermosetting epoxy resin (EP)–bisphenolAdiglycidyl ether (BADGE)–2-[[4-[2-[4-(Oxiran-2-ylmethoxy)phenyl]propan-2-yl]phenoxy]methyl]oxirane) and filled with alumina nanoparticles (NPs). The NPs consist of pretreated (with a silane agent) alpha alumina with irregular shapes and a 100nmm...
Experimental Study on the Torsional Behaviour of Prestressed HSC Hollow Beams
Bernardo, Luís; Lopes, Sérgio; Teixeira, Mafalda Daniela LeiteThis article describes an experimental program developed to study the influence of longitudinal prestress on the behaviour of high-strength concrete hollow beams under pure torsion. The pre-cracking, the post-cracking and the ultimate behaviour are analysed. Three tests were carried out on large hollow high-strength concrete beams with similar concrete strength. The variable studied was the level of longitudina...
Algorithms for Estimating the Location of Remote Nodes Using Smartphones
Pedro, Dario; Tomic, Slavisa; Bernardo, Luís; Beko, Marko; Oliveira, Rodolfo; Dinis, Rui; Pinto, Paulo; Amaral, PedroLocating the position of a remote node on a wireless network is becoming more relevant, as we move forward in the Internet of things and in autonomous vehicles. This paper proposes a new system to implement the location of remote nodes. A new prototype Android application has been developed to collect real measurements and to study the performance of several smartphone's sensors and location algorithms, includi...
Neutral Axis Depth versus Ductility and Plastic Rotation Capacity on Bending in...
Bernardo, Luís; Nepomuceno, Miguel; Pinto, HugoThis article presents an experimental study on the evolution of the neutral axis depth at failure in the critical section with the flexural ductility and plastic rotation capacity of reinforced concrete (RC) lightweight-aggregate concrete (LWAC) beams. For this, the results of a previous experimental program involving RC LWAC beams tested in flexure until failure are used. The variable studies were the concrete...