20 documents found, page 1 of 2
Diffusion of muonic hydrogen in hydrogen gas and the measurement of the 1s hype...
Nuber, Jonas; Adamczak, A.; Abdou Ahmed, M.; Affolter, L.; Amaro, F. D.; Amaro, Pedro; Antognini, A.; Carvalho, P.; Chang, Y. -H.; Chen, T. -L.The CREMA collaboration is pursuing a measurement of the ground-state hyperfine splitting (HFS) in muonic hydrogen (μp) with 1 ppm accuracy by means of pulsed laser spectroscopy. In the proposed experiment, the μp atom is excited by a laser pulse from the singlet to the triplet hyperfine sub-levels, and is quenched back to the singlet state by an inelastic collision with a H2 molecule. The resulting increase of...
Analysis of performance, bone characteristics, and expression of genes involved...
Araujo, A. C.; Araújo, R. D.S.; Dourado, L. R.B.; Machado, J. S.; Bayão, G. F.V.; Amoroso, L. [UNESP]; Artoni, S. M.B. [UNESP]; Shimano, A. C.Made available in DSpace on 2022-04-28T19:43:59Z (GMT). No. of bitstreams: 0 Previous issue date: 2022-01-01; 1. Sodium bicarbonate (NaHCO3), potassium carbonate (K2CO3), and ammonium chloride (NH4Cl) are commonly used to correct dietary electrolyte balance (DEB) in birds. However, there are many gaps in the knowledge of their effects when used simultaneously. This study investigated the effect of DEB levels on...
Reliability analysis of a timber truss system subjected to decay
Brites, Ricardo D.; Neves, L. C.; Machado, J. S.; Lourenço, Paulo B.; Sousa, Hélder S.Assessing the safety of existing timber structures is of paramount importance for taking reliable decisions on repair actions and their extent. The results obtained through semi-probabilistic methods are unrealistic, as the partial safety factors present in codes are calibrated considering the uncertainty exhibited by new structures. In order to overcome these limitations, and also to include the e ects of deca...
Selected solutions for rehabilitation of wooden structures : some portuguese ca...
Feio, A. O.; Félix, Daniel; Cunha, Vitor M. C. F.; Machado, J. S.Timber is one of the most used materials in the roofs and floors of monumental constructions in Portugal. The geometry is defined by elements that occupy a limited and well defined part of the tri-dimensional space, with a clear evidence of the hierarchy of the components. Timber elements are often visible, which allows easier conservation, identification of the wood species, characterization of details and eva...
Assessment of the structural properties of timber members in situ : a probabili...
Machado, J. S.; Lourenço, Paulo B.; Palma, PedroThe assessment of the structural performance of existing timber structures is dependent, among other factors, on the capacity to evaluate the physical and mechanical properties of structural timber elements in situ. This paper discusses the possibilities/advantages of using a probabilistic approach to obtain a more reliable prediction of the reference properties of these timber members in situ. The presented ap...
A semi-destructive tension method for evaluating the strength and stiffness of ...
Brites, Ricardo D.; Lourenço, Paulo B.; Machado, J. S.The paper presents a new semi destructive method for obtaining a prediction of the tension parallel to the grain properties of clear wood of structural timber members. This method is less intrusive than other existing methods and consists in extracting four small specimens along the length of the timber members. The tension strength and stiffness obtained is intended to be used as input data for the assessment ...
Reforço de estruturas de madeira por recurso a elementos de betão armado e metá...
Feio, A. O.; Machado, J. S.; Cunha, Vitor M. C. F.No presente trabalho irão ser descritas algumas soluções para a consolidação e/ou reforço de elementos estruturais de madeira utilizando diferentes técnicas, em função dos materiais utilizados: betão armado e elementos metálicos. Irão ser analisadas a possibilidade de introduzir elementos em betão armado e elementos/perfis metálicos, no reforço de elementos solicitados principalmente em flexão. Serão também ana...
Assessment of the structural properties of timber members in situ : a probabili...
Machado, J. S.; Lourenço, Paulo B.; Palma, PedroThe assessment of the structural performance of existing timber structures is dependent, among other factors, on the capacity to evaluate the physical and mechanical properties of structural timber elements in situ. This paper discusses the possibilities/advantages of using a probabilistic approach to obtain a more reliable prediction of the reference properties of these timber members in situ. The presented ap...
Avaliação das propriedades mecânicas da madeira in situ por ensaios em mesoprov...
Brites, Ricardo D.; Machado, J. S.; Lourenço, Paulo B.Uma das principais dificuldades da avaliação do estado de segurança de estruturas de madeira existentes é a determinação das propriedades mecânicas a utilizar para efeitos de cálculo. Os procedimentos habituais de estabelecimento das propriedades mecânicas com base no estabelecimento de classes de resistência por avaliação visual validada com ensaios não-destrutivos conduzem a resultados muito conservativos. No...
Capacity of a traditional timber mortise and tenon joint
Feio, A.; Lourenço, Paulo B.; Machado, J. S.The safety and quality of traditional timber structures mostly depends on the conditions of their connections. A testing campaign has investigated the behaviour of mortise and tenon timber joint. The present paper addresses the quantification of the strength capacity of wood-wood mortise and tenon joint by physical testing of full-scale specimens. In addition, the performance of different non-destructive techni...