Phase diagrams of binary mixtures of patchy colloids with distinct numbers and types of patches: Theempty fluid regime

We investigate the effect of distinct bonding energies on the onset of criticality of low functionality fluid mixtures. We focus on mixtures ofparticles with two and three patches as this includes the mixture where "empty" fluids were originally reported. In addition to the number of patches, thespecies differ in the type of patches or bonding sites. For simplicity, we consider that the patches on each species are identical: one species has threepatches of type A and the other has two patches of type B. We have found a rich phase behavior with closed miscibility gaps, liquid-liquid demixing, and negative azeotropes. Liquid-liquid demixing was found to pre-empt the "empty" fluid regime, of these mixtures, when the AB bonds are weaker than the AA or BB bonds. By contrast, mixtures in this class exhibit "empty" fluid behavior when the AB bonds are stronger than at least one of the other two. Mixtureswith bonding energies epsilon(BB) = epsilon(AB) and epsilon(AA) < epsilon(BB), were found to exhibit an unusual negative azeotrope. (C) 2011 American Institute of Physics. [doi:10.1063/1.3561396]

Complex market integration in MASCEM electricity market simulator

The restructuring that the energy sector has suffered in industrialized countries originated a greater complexity in market players’ interactions, and thus new problems and issues to be addressed. Decision support tools that facilitate the study and understanding of these markets become extremely useful to provide players with competitive advantage. In this context arises MASCEM, a multi-agent system for simulating competitive electricity markets. To provide MASCEM with the capacity to recreate the electricity markets reality in the fullest possible extent, it is essential to make it able to simulate as many market models and player types as possible. This paper presents the development of the Complex Market in MASCEM. This module is fundamental to study competitive electricity markets, as it exhibits different characteristics from the already implemented market types.

Níveis de hemoglobina, aleitamento materno e regime alimentar no primeiro ano de vida

OBJETIVO: Identificar a relação entre os níveis de hemoglobina e o consumo de leite materno, alimentos complementares e líquidos não nutritivos no primeiro ano de vida. MÉTODOS: Estudo transversal envolvendo 553 crianças menores de 12 meses de vida, que freqüentavam os serviços públicos de saúde. A concentração de hemoglobina foi avaliada pelo método cianometahemoglobina, usando-se o sistema HemoCue. Utilizou-se a técnica da regressão linear múltipla para avaliar as associações de interesse. RESULTADOS: Níveis de hemoglobina compatíveis com a anemia foram identificados em 62,8% das crianças investigadas, com maior ocorrência naquelas de seis a 12 meses de idade (72,6%). O aleitamento materno exclusivo nos primeiros seis meses de vida assegurou os mais elevados níveis de hemoglobina. Os demais regimes alimentares declinaram de maneira diferenciada os níveis de hemoglobina, que se tornaram compatíveis com a anemia quando o regime de aleitamento artificial foi adotado (p=0,009). O consumo de chá e/ou água declinou em 0,76 g/dl (p<0,001) os níveis de hemoglobina dos menores de seis meses de idade. Para as crianças de seis a 12 meses, os níveis de hemoglobina variaram significante e positivamente com o consumo de açúcar (p=0,017) e feijão (p=0,018) e negativamente com o consumo de fruta (p<0,001). CONCLUSÕES: O aleitamento materno exclusivo até os seis meses de idade e a manutenção do leite materno a partir dessa idade, associado aos alimentos complementares quali e quantitativamente adequados, podem contribuir para o aumento dos níveis da hemoglobina no primeiro ano de vida.

O regime de exigibilidade de caixa no IVA

Mestrado em Contabilidade

Regime fiscal aplicável às entidades sem fins lucrativos em Portugal e em Espanha

Em Portugal, as entidades sem fins lucrativos estão sujeitas, principalmente, ao imposto sobre o rendimento das pessoas colectivas, ao imposto de selo, ao imposto sobre o valor acrescentado e ao regime fiscal do mecenato. Em Espanha, foi criado o regime fiscal das entidades sem fins lucrativos e dos incentivos fiscais ao mecenato, regulado pela lei n.º49/2002, de 23 de Dezembro, que prevê a atribuição de benefícios fiscais em matéria de Impuesto sobre Sociedades, Impuesto sobre Transmisiones Palrimoniales y Actos Jurídicos Documentados, Impuesto sobre Bienes inmuebles e Impuesto sobre incrementos de Valor de los Terrenos.

O Contrato-promessa e o seu actual regime no ordenamento jurídico português

Provas Públicas de Avaliação de Competência Pedagógica e Técnico-Científica

A Hexanuclear Mixed-Valence Oxovanadium(IV,V) Complex as a Highly Efficient Alkane Oxidation Catalyst

The new hexanuclear mixed-valence vanadium complex [V3O3(OEt)(ashz)(2)(mu-OEt)](2) (1) with an N,O-donor ligand is reported. It acts as a highly efficient catalyst toward alkane oxidations by aqueous H2O2. Remarkably, high turnover numbers up to 25000 with product yields of up to 27% (based on alkane) stand for one of the most active systems for such reactions.

Mudanças climáticas nas regiões insulares

Tese de Doutoramento, Física, 27 de Novembro de 2013, Universidade dos Açores.

Copper(II) aza-bis(oxazoline) complex immobilized onto ITQ-2 and MCM-22 based materials as heterogeneous catalysts for the cyclopropanation of styrene

A copper(II) chiral aza-bis(oxazoline) homogeneous catalyst (CuazaBox) was anchored onto the external surface of MCM-22 and ITQ-2 structures, as well as encapsulated into hierarchical MCM-22. The transition metal complex loading onto the porous solids was determined by ICP-AES and the materials were also characterized by elemental analysis (C, N, H, S), FTIR, XPS, TG and low temperature N-2 adsorption isotherms. The materials were tested as heterogeneous catalysts in the benchmark reaction of cyclopropanation of styrene to check the effect of the immobilization procedure on the catalytic parameters, as well as on their reutilization in several catalytic cycles. Catalyst CuazaBox anchored onto the external surface of MCM-22 and ITQ-2 materials were more active and enantioselective in the cyclopropanation of styrene than the corresponding homogeneous phase reaction run under similar experimental conditions. This is due to the propylation of the acidic aza-Box nitrogen. HMCM-22 was nevertheless the best heterogeneous catalyst. Encapsulation of CuazaBox on post-synthesis modified MCM-22 materials led to low activities and enantioselectivities. But reversal on the stereochemical course of the reaction was observed, probably due to confinement effect. (C) 2013 Elsevier Inc. All rights reserved.

Efficient cyclohexane oxidation with hydrogen peroxide catalysed by a C-scorpionate iron(II) complex immobilized on desilicated MOR zeolite

The hydrotris(pyrazol-1-yl)methane iron(II) complex [FeCl2{eta(3)-HC(pz)(3)}] (Fe, pz = pyrazol-1-yl) immobilized on commercial (MOR) or desilicated (MOR-D) zeolite, catalyses the oxidation of cyclohexane with hydrogen peroxide to cyclohexanol and cyclohexanone, under mild conditions. MOR-D/Fe (desilicated zeolite supported [FeCl2{eta(3)-HC(pz)(3)}] complex) provides an outstanding catalytic activity (TON up to 2.90 x 10(3)) with the concomitant overall yield of 38%, and can be easy recovered and reused. The MOR or MOR-D supported hydrotris(pyrazol-1-yl)methane iron(II) complex (MOR/Fe and MOR-D/Fe, respectively) was characterized by X-ray powder diffraction, ICP-AES, and TEM studies as well as by IR spectroscopy and N-2 adsorption at -196 degrees C. The catalytic operational conditions (e.g., reaction time, type and amount of oxidant, presence of acid and type of solvent) were optimized. (C) 2013 Elsevier B.V. All rights reserved.

O Atlântico Revolucionário: circulação de ideias e de elites no final do Antigo Regime

Compilação de textos apresentados no Colóquio internacional que teve lugar em Angra do Heroísmo nos dias 4, 5 e 6 de Novembro de 2010.

A DNA barcode approach of the Laurencia complex (Ceramiales, Rodophyta) in the tropical and subtropical Atlantic ocean

10th International Phycological Congress, Orlando, Florida, USA, 4-10 de agosto 2013.