Browsing by Issue Date, starting with "2018-07-05"
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- A utilização de textos não convencionais no ensino das ciências da natureza: a sua eficácia na aprendizagemPublication . Sampaio, Maria Teresa Brito Chedas de; Almeida, AntónioNo 1.º Ciclo do Ensino Básico (CEB), os tempos letivos podem ser geridos de forma a potenciar aprendizagens significativas. A seleção de uma área curricular para aprendizagem de outros conteúdos ou desenvolvimento de competências é uma possibilidade que pode ser considerada pelos professores deste nível de ensino. Sendo o Português uma área facilitadora do ensino das ciências, a professora- -investigadora optou por iniciar um estudo de investigação, adotando uma metodologia integradora, na qual se procurou relacionar o Português com o Estudo do Meio. A investigação teve assim como objetivo compreender se a utilização de textos convencionais e não convencionais contribui de facto para a aprendizagem das ciências naturais. O texto convencional é elaborado de acordo com uma estrutura macroposicional específica, e, por sua vez, o texto não convencional caracteriza-se por combinar e integrar géneros textuais diferentes de formas diversificadas e inovadoras. Na turma de 4.º ano de escolaridade da professora-investigadora, foram implementadas sequências de atividades, integrando a leitura e interpretação de textos convencionais e não convencionais. A qualidade da interpretação textual e a aquisição de conhecimentos foi avaliada através de grelhas de correção de fichas formativas, segundo a Taxonomia da Compreensão Leitora de Català et al. (2001), e através de uma grelha de correção da ficha sumativa. Concluiu-se que os resultados dos alunos ao nível da interpretação textual e da aquisição do conhecimento científico variam de acordo com os temas programáticos. Já a utilização de textos convencionais e não convencionais não foi relevante para as dimensões referidas, dado que os resultados dos alunos não se alteraram significativamente em função do tipo de texto utilizado. Todavia, verificou-se que é possível promover a aquisição de conhecimento científico através da leitura e exploração de textos convencionais e não convencionais, sendo que se considera que estes tipos de textos se complementam. Considera-se assim que a exploração em simultâneo dos textos convencionais e não convencionais pode beneficiar o processo de ensino-aprendizagem.
- Crisis communication during a national fire disasterPublication . Pereira, Sandra Cristina Martins; Nobre, Paula Cristina do NascimentoThis paper combines two topics: “government public relations and public crisis communication” with the “erosion of trust in (public) authorities”. It is difficult to discuss public crisis communication without considering the damages and implications to people’s trust in public and governmental institutions. Purpose: Study a particular severe situation that forced the Portuguese government to react and communicate with the public to then draw conclusions about the consequences of that reaction/communication. Mainly, establish a correlation between the government’s performance, its response strategy to the crisis that followed a big fire and the growing lack of trust in political bodies. Methodology: This research followed two sequential procedures - a stakeholder analysis and a content analysis applied to information materials collected from the Portuguese government official portal, between 17 June and 12 October 2017. Findings: The results point out for a crisis response strategy that tries to avoid the citizen’s distrust emphasizing the government’s competence dealing with the fire issue and its consequences. Research limitations: Being a sensitive issue, there were difficulties in the direct access to eventual goals and strategies behind the crisis management in the reported situation. In addition, because this is an exploratory study the citizen’s opinion is not yet included in this research stage. Originality/value: Looking at the links between the issues of ‘crisis communication’ and ‘trust’ the study intends to bring awareness to the important role that public relations function can play in helping governments to manage communication in a crisis context, providing enlightening for future crisis that may harm the trust in political institutions.
- Nonprofits and theirs communication professionals: their role in today's worldPublication . Raposo, Ana Luísa Canelas Rasquilho; Eiró-Gomes, MafaldaThis paper addresses the questions, perplexities and results of an ongoing project that involves mixed methods analysis and that has as its main purpose to understand the role of the communication professionals in the non for profit organisations in Portugal. The specific research questions that this paper addresses may be summarised as an interrogation about the role that the communication professionals are called to fulfill in these institutions. Do the communication professionals have technical, tactical and strategic responsibilities in the portuguese non for profit organisations?
- Can we truly predict the compressive strength of concrete without knowing the properties of aggregates?Publication . De Brito, Jorge; Kurda, Rawaz; Raposeiro Da Silva, PedroThis paper is focused on the influence of the geological nature and quality of the aggregates on the compressive strength of concrete and explains why it is important not to ignore the characteristics of aggregates in the estimation of the strength of concrete, even for virgin aggregates. For this purpose, three original (Abrams, American Concrete Institute Manual of concrete practice and Slater) and two modified (Bolomey and Feret) models were used to calculate the strength of concrete by considering results of various publications. The results show that the models do not properly predict the strength of concrete when the characteristics of aggregates are neglected. The scatter between the calculated and experimental compressive strength of concrete, even when made with natural aggregates (NAs) only, was significant. For the same mix composition (with similar cement paste quality), there was a significant difference between the results when NAs of various geological nature (e.g., limestone, basalt, granite, sandstone) were used in concrete. The same was true when different qualities (namely in terms of density, water absorption and Los Angles abrasion) of aggregates were used. The scatters significantly decreased when the mixes were classified based on the geological nature of the aggregates. The same occurred when the mixes were classified based on their quality. For both modified models, the calculated strength of mixes made with basalt was higher than that of the mixes containing other types of the aggregates, followed by mixes containing limestone, quartz and granite. In terms of the quality of the aggregates, the calculated strength of concrete increased (was overestimated) as the quality of the aggregates decreased. The influence of the aggregates on the compressive strength of concrete became much more discernible when recycled aggregates were used mainly due to their more heterogeneous characteristics.