Predictivity Strength of the Spatial Variability of Phenanthrene Sorption Across Two Sandy Loam Fields

Sorption is commonly agreed to be the major process underlying the transport and fate of polycyclic aromatic hydrocarbons (PAHs) in soils. However, there is still a scarcity of studies focusing on spatial variability at the field scale in particular. In order to investigate the variation in the field of phenanthrene sorption, bulk topsoil samples were taken in a 15 × 15-m grid from the plough layer in two sandy loam fields with different texture and organic carbon (OC) contents (140 samples in total). Batch experiments were performed using the adsorption method. Values for the partition coefficient K d (L kg−1) and the organic carbon partition coefficient K OC (L kg−1) agreed with the most frequently used models for PAH partitioning, as OC revealed a higher affinity for sorption. More complex models using different OC compartments, such as non-complexed organic carbon (NCOC) and complexed organic carbon (COC) separately, performed better than single K OC models, particularly for a subset including samples with Dexter n < 10 and OC <0.04 kg kg−1. The selected threshold revealed that K OC-based models proved to be applicable for more organic fields, while two-component models proved to be more accurate for the prediction of K d and retardation factor (R) for less organic soils. Moreover, OC did not fully reflect the changes in phenanthrene retardation in the field with lower OC content (Faardrup). Bulk density and available water content influenced the phenanthrene transport mechanism phenomenon.

Coalition of distributed generation units to Virtual Power Players - a game theory approach

Smart Grids (SGs) have emerged as the new paradigm for power system operation and management, being designed to include large amounts of distributed energy resources. This new paradigm requires new Energy Resource Management (ERM) methodologies considering different operation strategies and the existence of new management players such as several types of aggregators. This paper proposes a methodology to facilitate the coalition between distributed generation units originating Virtual Power Players (VPP) considering a game theory approach. The proposed approach consists in the analysis of the classifications that were attributed by each VPP to the distributed generation units, as well as in the analysis of the previous established contracts by each player. The proposed classification model is based in fourteen parameters including technical, economical and behavioural ones. Depending of the VPP strategies, size and goals, each parameter has different importance. VPP can also manage other type of energy resources, like storage units, electric vehicles, demand response programs or even parts of the MV and LV distribution network. A case study with twelve VPPs with different characteristics and one hundred and fifty real distributed generation units is included in the paper.

Decision Support for Energy Contracts Negotiation with Game Theory and Adaptive Learning

This paper presents a decision support methodology for electricity market players’ bilateral contract negotiations. The proposed model is based on the application of game theory, using artificial intelligence to enhance decision support method’s adaptive features. This model is integrated in AiD-EM (Adaptive Decision Support for Electricity Markets Negotiations), a multi-agent system that provides electricity market players with strategic behavior capabilities to improve their outcomes from energy contracts’ negotiations. Although a diversity of tools that enable the study and simulation of electricity markets has emerged during the past few years, these are mostly directed to the analysis of market models and power systems’ technical constraints, making them suitable tools to support decisions of market operators and regulators. However, the equally important support of market negotiating players’ decisions is being highly neglected. The proposed model contributes to overcome the existing gap concerning effective and realistic decision support for electricity market negotiating entities. The proposed method is validated by realistic electricity market simulations using real data from the Iberian market operator—MIBEL. Results show that the proposed adaptive decision support features enable electricity market players to improve their outcomes from bilateral contracts’ negotiations.

Fiscal decentralisation and economic theory

There is no complete overview or discussion of the literature of the economics of federalism and fiscal decentralization, even though scholarly interest in the topic has been increasing significantly over recent years. This paper provides a general, brief but comprehensive overview of the main insights from the literature on fiscal federalism and decentralization. In doing so, literature on fiscal federalism and decentralization is grouped into two main approaches: “first generation of theories” and “second generation of theories”.

Relatório de estágio

O presente relatório – requisito parcial para obtenção do grau de mestre em Educação Pré-Escolar e Ensino do 1.º Ciclo do Ensino Básico – reflete os conhecimentos desenvolvidos, assentes num quadro teórico e concetual construído ao longo do ciclo de estudos, e explana as aprendizagens decorrentes da prática pedagógica supervisionada desenvolvida em nos contextos de estágio: Educação Pré-Escolar e 1.º Ciclo do Ensino Básico. Este foi erigido numa perspetiva de desenvolvimento pessoal e profissional, promovendo uma postura indagadora e reflexiva face à prática educativa. Com efeito, a mestranda teve como objetivo descrever, compreender e refletir acerca do seu processo de formação relevando o desenvolvimento de capacidades e competências substanciais à prática docente, e a construção de aprendizagens que permitiram uma tomada de consciência do compromisso e responsabilidade do papel do docente. O período de estágio, a par das aulas da unidade curricular: Prática Pedagógica Supervisionada apresentou-se como uma oportunidade fulcral para o desenvolvimento e experimentação de métodos e estratégias, questionando conceções e preconceitos inerentes ao processo de ensino e de aprendizagem. Conforme a metodologia de investigação-ação, a ação da mestranda desenvolveu-se ciclicamente, e de forma articulada, numa perspetiva socio construtivista e holística do desenvolvimento, com enfoque na criança. Também o processo colaborativo constituiu um processo eficaz na elaboração e reflexão sobre a prática estimulando momentos de aprendizagem e de recriação da prática. Assim, este mestrado contribuiu fortemente para a construção da identidade profissional da futura docente. Concludentemente, a conceção teórica e prática conseguida no decorrer dos estágios, nos dois níveis educativos, iniciaram a edificação de uma postura profissional, reflexiva e investigativa, reafirmando competências profissionais e pessoais e valorando-se a formação ao longo da vida para aquele que se constitui, nesta formação, um docente generalista.