Encontrados 137 documentos, a visualizar página 1 de 14
Individuals, persons and agency theory – contrasted views on social interaction...
Lopes, H.The paper draws on the distinction between the concepts of individual and person to show how management rhetoric addresses workers as persons whereas actual management practices organize work as if workers were opportunistic individuals. We argue that this paradox is partly due to the widespread influence of agency theory whose conception of the firm, based on the agency costs generated by the supposedly non-co...
Monitoring nitrogen nutritional status of vegetables in the social garden of Po...
Lopes, H.; Arrobas, Margarida; Freitas, Sara; Ferreira, I.Q.; Rodrigues, M.A.Urban agriculture is a global phenomenon. In developing countries urban agriculture has had crucial importance in alleviating problems of extreme poverty and unemployment of the populations of the larger cities. In developed countries has been particularly important during periods of economic depression. Nowadays, the urban agriculture in developed countries is increasing, aimed more at leisure, sports and recr...
Work autonomy, work pressure and job satisfaction – A comparative analysis of 1...
Lopes, H.; Calapez, T.; Lagoa, S.Based on micro-data, we show that work autonomy has declined and work pressure increased in almost all EU countries since 1995. Since that evolution is substantially detrimental for workers, we examine whether workers of varied skill levels in different countries have been equally impacted. Descriptive analysis shows that low-skill clerical workers are the most affected and that Scandinavian countries fare bett...
Antimicrobial pressure of ciprofloxacin and gentamicin on biofilm development b...
Machado, Idalina; Graça, Joana; Lopes, H.; Lopes, Susana Patrícia; Pereira, M. O.This work aims at characterizing endoscope biofilm-isolated (PAI) and 2 reference strain P. aeruginosa (PA) adhesion, biofilm formation and sensitivity 3 to antibiotics. The recovery ability of the biofilm-growing bacteria subjected to 4 intermittent antibiotic pressure [ciprofloxacin (CIP) and gentamicin (GM)], as 5 well as the development of resistance towards antibiotics and benzalkonium 6 chloride (BC), wer...
Análise do comportamento mecânico dos discos intervertebrais da região lombar q...
Mendonça, B.; Ribeiro, J.E.; Vaz, M.; Lopes, H.: Neste trabalho pretende-se caracterizar o campo de deslocamentos e deformações de um disco intervertebral, assim como avaliar a aplicação da técnica de Correlação Digital de Imagem (CDI) neste tipo de material. Para a realização deste trabalho, foi montado um ensaio de compressão de uma coluna vertebral e através do equipamento de CDI foi possível a realização de uma análise global do campo de deslocamentos o...
Análise do comportamento mecânico dos discos intervertebrais da região lombar q...
Mendonça, B.; Ribeiro, J.E.; Vaz, M.; Lopes, H.Neste trabalho pretende-se caracterizar o campo de deslocamentos e deformações de um disco intervertebral, assim como avaliar a aplicação da técnica de Correlação Digital de Imagem (CDI) neste tipo de material. Para a realização deste trabalho, foi montado um ensaio de compressão de uma coluna vertebral e através do equipamento de CDI foi possível a realização de uma análise global do campo de deslocamentos oco...
A selective phase filter based on speckle decorrelation
Lopes, H.; Ribeiro, J.E.; Santos, J.; Vaz, M.A new phase filter technique based on the speckle decorrelation analysis is proposed on this paper to remove the noise from the phase maps. The phase maps are extracted from speckle interferometry static measurements using the four phase shifted intensities, with the constant phase step of π/2. The speckle descorrelation points are then selected based on the average phase step of the reference and deformation s...
A selective phase filter based on speckle decorrelation
Lopes, H.; Ribeiro, J.E.; Santos, J.V. dos; Vaz, M.A.P.A new phase filter technique based on the speckle decorrelation analysis is proposed on this paper to remove the noise from the phase maps. The phase maps are extracted from speckle interferometry static measurements using the four phase shifted intensities, with the constant phase step of π/2. The speckle descorrelation points are then selected based on the average phase step of the reference and deformation s...
Displacement and strain field assessment of PDMS using digital image correlation
Mendonça, B.; Ribeiro, J.E.; Lopes, H.; Martins, P.; Vaz, M.The main goal of this work is the characterization of the hyper-elastic mechanical behaviour of PDMS. The special specimens of PDMS (Sylgard® 184) were tested in a bi-axial tensile machine. The displacement and strain fields were measured using a commercial digital image correlation system (ARAMIS of GOM) during the tensile test. The experimental measurements are compared with numerical simulations, which use t...
Damage identification using real time rotating field analysis
Lopes, H.; Ribeiro, J.E.; Santos, J.V.A. dos; Vaz, M.A.P.; Gomes, J.F.S.This paper proposes a real time damage identification method based on the perturbation analysis of the rotation field, which are measured using shearography technique. A particular case of phase modulation method is applied to the interference pattern in order to improve the spatial resolution of the rotation field. A program was developed in Matlab® platform for digital recording the information capture by CCD...
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