Encontrados 6 documentos, a visualizar página 1 de 1
Teste de desempenho individual de reprodutores da raça Morada Nova: resultados ...
FACÓ, O.; LOBO, R. N. B.; BOMFIM, M. A. D.; LIMA JÚNIOR, F. E. B. de; SILVA, D. C. C.; NOBRE, J. A.2009
Residual stresses analysis of ND-YAG laser welded joints
Costa, J. M.; Pires, J. T. B.; Antunes, F.; Nobre, J. P.; Borrego, L. P.http://www.sciencedirect.com/science/article/B6V2X-4V3546Y-2/2/8ee5852dd432955cfe324f9228305af1
Clear-PEM: A PET imaging system dedicated to breast cancer diagnostics
Abreu, M. C.; Aguiar, D.; Albuquerque, E.; Almeida, F. G.; Almeida, P.; Amaral, P.; Auffray, E.; Bento, P.; Bruyndonckx, P.; Bugalho, R.; Carriço, B.The Clear-PEM scanner for positron emission mammography under development is described. The detector is based on pixelized LYSO crystals optically coupled to avalanche photodiodes and readout by a fast low-noise electronic system. A dedicated digital trigger (TGR) and data acquisition (DAQ) system is used for on-line selection of coincidence events with high efficiency, large bandwidth and small dead-time. A sp...
An empirical methodlogy to estimate a local yield stress in work-hardened surfa...
Nobre, J.; Dias, A.; Kornmeier, M.Abstract A methodology is proposed for estimating the local yield stress in work-hardened surface layers. It is based on the concept of in-depth normalized variation of hardness and x-ray diffraction peak width, both of which measure the strain-hardening attained by the materials' surface-treated layers due to, for example, shot-peening. Its principle is directly founded on the classical hardness theory. To st...
Use of the hole-drilling method for measuring residual stresses in highly stres...
Nobre, J.; Kornmeier, M.; Dias, A.; Scholtes, B.Abstract The same shot-peening treatment was applied to five steels with different mechanical properties. The induced residual stress profiles were analyzed using X-ray diffraction and incremental hole drilling (IHD). The results of both techniques showed that IHD can still be successfully used for measuring shot-peening residual stresses, even if these exceed the yield strength of the bulk material. Expected ...
A study on elasto-plastic impact friction
Nobre, J. P.; Dias, A. M.; Gras, R.A purpose-built pendulum machine was used to study the oblique impact and the behaviour of the surface layers of a normalized low alloy steel subjected to the impact of hard [alpha]-alumina balls. The effect of relative tangential velocity on impulses, restitution coefficient and impact energy loss, was analysed. The morphology of the impact indentations was characterized and related to the impulses obtained. T...
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