A lógica produtiva em produtores de leite micaelenses

Seminário Agricultura e Ambiente: Conflito de lógicas produtivas?, Departamento de Ciências Agrárias, Universidade dos Açores, 27 de novembro 2014. ISBN 978- 972-8612-94-8 (Atas em CD)A produção de leite, nos Açores, representa a maior atividade agrícola regional e contribui com cerca de 1/3 da produção de leite nacional. Na região, a ilha de S. Miguel contribui com mais de metade da produção de leite. Para verificar se a lógica produtiva das explorações micaelenses se coaduna com a viabilidade económica e com os níveis de eficiência técnica das explorações leiteiras, utilizámos a base de dados da AASM (Almeida, 2012), que é constituída por 91 explorações agropecuárias (produção de leite) inscritas no Contraste Leiteiro e com contabilidade organizada, em 2010. A lógica produtiva foi avaliada pelo nível de intensificação das explorações leiteiras, que foi medida pela carga animal por hectare. Com base numa nova organização dos dados da AASM, confrontaram-se os níveis de eficiência e viabilidade e competitividade económica com os resultados de explorações leiteiras obtidos por Silva e Almeida (2014) e Almeida e Silva (2013-a; 2013-b). Em termos gerais, constata-se que o valor de eficiência técnica das explorações leiteiras a rendimentos constantes e que o número explorações eficientes a nível técnico é mais elevado no intervalo inferior a 1,4 animais por hectare, ou seja, a extensificação potencia melhores níveis de eficiência técnica. Na viabilidade e competitividade económica das explorações leiteiras, verifica-se que, de um modo geral, ao maior nível de intensificação, corresponde a maior a produção de leite e rendimento. No entanto, a política agrícola, em vigor nos Açores, promove a lógica produtiva dos produtores de leite, em que o aumento da produção de leite não acompanha a lógica da eficiência técnica. A decisão do produtor de leite micaelense é mais condicionada pela lógica económica que pela lógica ambiental.info:eu-repo/semantics/publishedVersio

Origin of the Significant Impact of Ta on the Creep Resistance of FeCrNi Alloys

Heat resistant FeCrNi alloys are widely used in the petrochemical industry because they exhibit a unique combination of creep and oxidation resistance at temperatures exceeding 900$^\circ$C. Their creep properties are often optimized by micro-additions of carbide forming elements. In the present work, the influence of Ta micro-additions has been experimentally investigated both on as-cast and aged microstructures to understand the origin of the significant impact of this element on the creep resistance. Calculations with thermocal software were also carried out to support experimental data. It is shown that a small addition of Ta is beneficial as it increases the volume fraction of stable MC carbides. We demonstrate also that additions of Ta may have a dramatic effect on the thermal stability of microstructures. This is attributed to a smaller equilibrium volume fraction of M23C6 and more pronounced heterogeneous precipitation at MC/matrix interfaces. The influence on the creep properties in then discussed

Perceptions of future leaders towards business ethics and sustainability

This paper examines the perception of business students (BS) concerning business ethics (BE) and sustainable operations management (SOM), in cases reporting ethical dilemmas. The BS have not previously attended any specific course, either dealing with BE, SOM or providing training in ethics. A test administered to 60 BS enabled to picture perceptions regarding: (i) ethical maturity level based on general education/personal sensitivity; and (ii) ethical decision-making processes of BS. The study also determined that BS have a surprisingly high ethical maturity. However, they are not sensitive to BE/SOM scientific’ research importance. Findings point out to development of Business School curricula

Influence of temperature on continuous high gravity brewing with yeasts immobilized on spent grains

Flavor compounds’ formation and fermentative parameters of continuous high gravity brewing with yeasts immobilized on spent grains were evaluated at three different temperatures (7, 10 and 15 °C). The assays were performed in a bubble column reactor at constant dilution rate (0.05 h−1) and total gas flow rate (240 ml/min of CO2 and 10 ml/min of air), with high-gravity all-malt wort (15°Plato). The results revealed that as the fermentation temperature was increased from 7 to 15 °C, the apparent and real degrees of fermentation, rate of extract consumption, ethanol volumetric productivity and consumption of free amino nitrogen (FAN) increased. In addition, beer produced at 15 °C presented a higher alcohols to esters ratio (2.2–2.4:1) similar to the optimum values described in the literature. It was thus concluded that primary high-gravity (15°Plato) all-malt wort fermentation by continuous process with yeasts immobilized on spent grains, can be carried out with a good performance at 15 °C.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq).Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP).Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Efeito de poleiros artificiais na chuva de sementes em áreas de ocorrência da floresta estacional semidecidual, Fênix, PR.

Resumo

Use of Physical Education Classes as a Didactic Laboratory for Teaching Mathematics: An Example with a Quadratic Function

The research objective of this study was to evaluate the use of Physical Education classes as didactic laboratory for lessons in Mathematics, presenting an alternative way to conduct classes, mainly of quadratic functions, illustrating basic concepts such as graphs plotting and determination coefficients, analyze if such use achieves some of the goals of using a Didactic Laboratory in addition to research ways to interdisciplinary with Physics. Discusses an action in which students work in groups to solve problems proposed based on empirical data obtained through play activities and measures of athletics values practiced by the students allowing may have the opportunity to produce arguments and more meaningful answers, which would improve the overall learning. The athletics and recreational activities are then used as problematic objects both empirically and qualitatively. As a result, it was observed that some of the objectives of a Didactic Laboratory are achieved when using the Physical Education classes and it appears that this feature is much more available in public schools than they are equipped with a science laboratory

Environmental benefits and mechanical performance of cement mortars with tungsten mining residues incorporation

No. ERC2016-CoG 725034 UID/AMB/04085/2020 PD\BD\135170\2017. TSecondary mining resources have been largely applied for the development of alternative building products. Additionally, its reuse versatility increases the potential on the future circular economy generation. Herein, mining residues from Panasqueira mine were applied in the formulation of cement-based mortars, according to EN 196-1 standard.Mechanical performance of mortars was analysed after the replacement of the conventional binder (cement) by mining residues in 10, 25 and 50 % (v/v). As expected, compressive and flexural strength decrease when compared to the reference mortar (100 % cement) in all cases. This decrease was more significant in terms of compressive strength (between 27 % and 71 %), when compared to flexural strength results (between 18 % and 56 %). Furthermore, an environmental approach of secondary mining resources incorporation on mortars, regarding Portugal and Poland data, was carried out. The savings in terms of primary resources may promote to minimise energy impacts. When mining residues replace cement in 10 % is possible to save 0.3 or 1.9 Mt of cement production and 0.14 or 0.89 CO2 Mt emissions, in Portugal and Poland, respectively.publishersversionpublishe

Overview of mining residues incorporation in construction materials and barriers for full-scale application

This work has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No. 778045, as well as from Portuguese funds from FCT/MCTES through grant UID/AMB/04085/2019. J. Almeida acknowledges Fundação para a Ciência e a Tecnologia for her PhD fellowship 560 PD/BD/135170/2017.Resources efficiency regarding the decrease of residues generation and disposal are important steps towards a cleaner production in the construction and mining industry. Minning processes generate huge amounts of residues, and some deposits have accumulated them over hundreds of years, causing environmental and public health problems. However, mining residues can be recovered as secondary supplies for construction materials production due to its physical, chemical and microstructural properties. This study presents a critical review on sustainable strategies researched to introduce mining residues in the construction sector. The gaps and barriers of these strategies and final products are discussed, concerning a safe and sustainable inclusion of mine residues in construction materials productionauthorsversionpublishe