42 documents found, page 1 of 5
Water Quality: Manganese in drinking water for dairy cattle
Moreira, O.; Martins, J.M.; Lucas, R.; Branco, R.Climate change affects livestock systems through direct impacts on the physiology, behavior, production and welfare of animals and indirectly through the availability, composition and quality of food. Water is essential for the life of animals, since it intervenes in various metabolic processes. An inadequate water supply could reduce the health and performance of the animals. In dairy farms, the use of quality...
Water Quality: Farmers' perception of the importance of the quantity and qualit...
Resende, V.; Moreira, O.; Martins, J.M.; Lucas, R.; Branco, R.Climate change affects livestock systems through direct impacts on the physiology, behavior, production and welfare of animals and indirectly through the availability, composition and quality of food and milk. The aim of this study is to ascertain whether dairy cattle farmers in Portugal (1) consider the issue of ”water scarcity and quality” to be important on dairy cattle farms. Questionnaires were sent to dai...
The politics of pro-outsider labour market reforms: A configurational study
Marques, P.; Branco, R.; Guimarães, R.Over the past decades, the level of regulation of fixed-term contracts has been in flux. Many reforms deregulating these contracts were followed by a regulatory countertrend, a puzzling finding considering influential theoretical expectations like the ones developed by the dualization and liberalization literatures. This paper draws on the comparative employment relations and comparative political economy liter...
Running fast, just to stay in the same place? Social movements, political parti...
Oliveira, E. C. de.; Branco, R.; Suleman, F.This article examines the political dynamics behind Portugal’s 2019 Informal Caregiver Statute (ICS), focusing on how social movements influenced the policy process through political mediation. The statute was prompted by caregiver mobilisation and advanced in parliament by partisan allies, despite initial government resistance. The movement’s influence relied on a favourable political opportunity structure, su...
Qualidade de Água em Explorações de Bovinos de Leite: Impacto na produção, repr...
Resende, V.; Moreira, O.; Martins, J.M.; Lucas, M.R.; Branco, R.O aumento estimado da taxa de crescimento da população mundial sugere que, no futuro, haverá maior procura alimentar, que por sua vez, terá um efeito direto no uso da água para fins agrícolas (Mancosu et al., 2015). Além disso, como resultado do aumento da escassez de água e da seca devido às alterações climáticas (Jiménez et al., 2014), espera-se que a utilização extensiva de água para irrigação ocorra no cont...
Energy-based critical plane fatigue methods applied to additively manufactured ...
Cruces, A.S.; Branco, R.; Borrego, L. P.; Lopez-Crespo, P.In this work, the uniaxial and biaxial fatigue behaviour of maraging steel (18Ni300) obtained by additive manufacturing was studied. The material was evaluated using several biaxial load paths and different load levels. The predictive capacity of the fatigue life and crack initiation angle of the critical plane methods of Liu (I and II), and Chu, Conle, and Bonnen (CCB) were evaluated. The results obtained show...
Effect of austempering temperature on microstructure and cyclic deformation beh...
Long, X. Y.; Branco, R.; Macek, W.; Masoudi Nejad, R.; Lesiuk, G.; Zhu, S. P.; Amaro, Ana M.This paper examined the cyclic deformation behaviour of multiphase low-carbon steel that was subjected to austempering heat treatments at four temperatures (190 °C, 230 °C, 275 °C, and 315 °C) below the martensite start temperature (Ms = 353 °C). The tests were conducted at room temperature, under fully reversed strain-controlled conditions, with strain amplitudes in the range 0.5–1.0%. The microstructure was o...
Monotonic and fatigue behaviour of notched glass fibre-reinforced polymer lamin...
Vidinha, H.; Branco, R.; Amaro, Ana M.; Neto, M. A.; Reis, P. N. B.; Costa, J.D.M.This paper studies the monotonic and fatigue behaviour of notched glass fibre-reinforced polymers after long-term exposure in seawater. Uniaxial quasi-static tensile tests and uniaxial stress-controlled cyclic tests were carried out for different immersion times, ranging from 0 days to 910 days, using rectangular cross-section specimens with a central hole. The geometric discontinuity was monitored, via digital...
Three-dimensional numerical study of thickness effect on plastic CTOD and monot...
Camas, D.; Branco, R.; Antunes, F.V.; Neto, D.M.This work is a numerical study of CT specimens with straight cracks and different thickness values submitted to different load levels, which aims to analyse the shape and dimension variations of the monotonic yielded area near the crack tip, examining the impact of variables such as load magnitude, thickness of the specimen and position along the crack front. Additionally, it intends to explore the correlation ...
Failure mechanisms of GRFP after long term exposure to seawater
Vidinha, H.; Branco, R.; Neto, M. A.; Amaro, A. M.; Reis, P. N. B.; Costa, J. D.The adoption of composite polymeric materials in marine applications is fully related to factors such as reliability and cost-effectiveness. The improvement in the knowledge and deep understanding of the behaviour of these materials considering the operational environment is fundamental for avoiding exceedingly high safety factors which compromise the market price. Accordingly, the effects of immersion in seawa...