Suchergebnisse

Este artigo procura refletir sobre a construção de um Mercado Único Digital e sobre as iniciativas que visam aumentar a conectividade dos cidadãos europeus. A generalização do acesso à Internet apresenta evidentes vantagens e benefícios para cidadãos e empresas, mas também desafia a sociedade. Duas questões principais são problematizadas: a literacia digital e o poder dos atores na rede. Em primeiro lugar, os benefícios da disponibilização de uma determinada tecnologia não resultam apenas da generalização do seu acesso. Resultam, sim, e em grande parte, da capacidade dos indivíduos para tirar partido dessa utilização e do uso que é promovido. Deste modo, as políticas de promoção de tecnologias não podem estar dissociadas de políticas de promoção de literacia mediática e digital. Em segundo lugar, generalizar o acesso à Internet pode potenciar ainda mais o poder dos atores que, neste momento, concentram já grande parte da atividade dos internautas. Esta problemática diz respeito a questões de concorrência económica, mas também de poder social para fornecer quadros simbólicos de leitura do mundo. ; This article seeks to reflect on the construction of a Digital Single Market (DSM) and on initiatives aimed at increasing the connectivity of European citizens. The widespread access to internet has obvious advantages for citizens and businesses, but it also gives rise to challenges for society. There are two principal issues. Firstly, digital literacy and the power of the players. First, the benefits of the availability of a particular technology do not just result from widespread access. They result, to a large extent, from the capacity of people to take advantage of the use and from the practices that are promoted. Thus, policies to promote technology cannot be dissociated from policies to promote media and digital literacy. Secondly, generalizing access to the Internet can further enhance the power of the players who, at this moment, already concentrate a large part of Internet users' activity. This issue concerns matters of economic competition, but also of social power to provide symbolic frameworks to read the world.

Vanadium oxides (VOx) have been extensively investigated due to their many phases and range of properties, such as eletrochromic, thermochromic and electrochemical. Therefore, this promising materials may be implemented as energy efficiency materials in many sectors like military, industrial, domestic and transport. In the present dissertation VOx phases and nanostructures have been synthesized by hydrothermal synthesis using microwave irradiation as heating source. The synthesis parameters, such as reducing agent, dissolution method and the hydrothermal parameters temperature, reducing agent concentration and ratios were vary and studied to observe their impact in morpholy and the resultant VOx phase. Several pure and combination of VOx phases were achieved, such as VO2 (B), V6O13, V3O7, VO2 (M2) and V2O5. The structural composition and morphology of the as-obtained powders were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Additionally, to observe a possible transition temperature of the samples a thermogravimetry and differential scanning calorimetry (TG-DSC) analysis were performed. Furthermore, nanosheets were layered in fluorine doped tin oxide (FTO) and Indium tin oxide (ITO) and applied as cathode, with a maximum current of 1.75 mA for ITO and 1.46 mA for FTO.

The use of hyperlinks in blogs produces hypertexts, which are characterized by an irregular and not sequential organization. Contrary to the narrative structures in which the author exercises his authority by setting an order of events, hypertexts compromise the integrity of authorship. Blog hyperlinking thus challenges traditional notion of authorship and control exercised over the speech produced. Political contexts, such as those inhabited by politicians and news providers, are quite sensitive to these compromises as control over meanings is seen as problematic. The use of a hyperlink can be seen as willingness to renounce to full control, but acknowledging its presence is insufficient to analyze its effects in the meaning of the posts. This article argues that a qualitative assessment of links is necessary if a full understanding of hyperlinks implications is to be provided. It proposes a model of analysis with three levels of compromising: referential, accessory, and compulsory.

Deliberative democracies are based on the principle of citizens' participation. However, election turnouts and citizens' alienation are signs of a political disengagement that could endanger the foundations of democratic systems. The spaces in which political debate and rational argumentation between equals may take place have diminished, yet new digital technologies have brought up potentialities in the promotion of online, horizontal and deliberative communication. Political blogs have been one of the most studied platforms, as they allow citizens engaged in political discussion and argumentation to establish a public sphere in which matters of public concern are debated. Nonetheless, issues of political polarization, fragmentation and non-rational debate have also been pointed out to limit the most optimistic perspectives over political blogs. By using the social network analysis, this paper aims to contribute to a better understanding of the role of Portuguese political blogs, by assessing its level of deliberation. ; This research was supported by the Fundação para a Ciência e Tecnologia and co-funded by the European Social Fund in the framework of the Programa Operacional Potencial Humano (POPH) of QREN (SFRH / BD / 45400 / ...

New technologies have enabled innovative possibilities of communication, but have also imposed new upon matters of ethics, particularly in regards to platforms such as blogs. This article builds upon the reflections and experiences on this issue, in an attempt to map and analyse the ethical questions underlying the Portuguese blogosphere. In order to reflect on the possibility and opportunity to create a code of ethics for bloggers, attention is permanently paid to the political ...

New technologies have enabled innovative possibilities of communication, but have alsoimposed new upon matters of ethics, particularly in regards to platforms such as blogs. This articlebuilds upon the reflections and experiences on this issue, in an attempt to map and analysethe ethical questions underlying the Portuguese blogosphere. In order to reflect on the possibilityand opportunity to create a code of ethics for bloggers, attention is permanently paid to thepolitical blogosphere.

Este artigo analisa o processo de redemocratização do Brasil através das Constituições de 1946 e 1988, abordando tanto o perfi l histórico dos trabalhos dos constituintes quanto a análise dogmática de alguns aspectos relevantes de cada Constituição. A importância do trabalho reside no fato de que estas duas Constituições representaram uma ruptura com regimes autoritários, e o estudo dos limites e das possibilidades das Assembléias Constituintes em cada momento histórico pode ser um importante fator para uma melhor compreensão da importância de um trabalho sistemático de afi rmação das normas constitucionais.

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