AM-OER: An Agile Method for the Development of Open Educational Resources

Open Educational Resources have emerged as important elements of education in the contemporary society, promoting life-long and personalized learning that transcends social, eco- nomic and geographical barriers. To achieve the potential of OERs and bring impact on education, it is necessary to increase their development and supply. However, one of the current challenges is how to produce quality and relevant OERs to be reused and adapted to different contexts and learning situations. In this paper we proposed an agile method for the development of OERs – AM-OER, grounded on agile practices from Software Engineering. Learning Design practices from the OULDI project (UK Open University) are also embedded into the AM-OER aiming at improving quality and facilitating reuse and adaptation of OERs. In order to validate AM-OER, an experiment was conducted by applying it in the development of an OER on software testing. The results showed preliminary evidences on the applicability, effectiveness and ef ciency of the method in the development of OERs

On the r−r-stability of spacelike hypersurfaces

In this paper we study the strong stability of spacelike hypersurfaces with constant $r$-th mean curvature in Generalized Robertson-Walker spacetimes of constant sectional curvature. In particular, we treat the case in which the ambient spacetime is the de Sitter space

Cosmic bulk viscosity through backreaction

We consider an effective viscous pressure as the result of a backreaction of inhomogeneities within Buchert's formalism. The use of an effective metric with a time-dependent curvature radius allows us to calculate the luminosity distance of the backreaction model. This quantity is different from its counterpart for a "conventional" spatially flat bulk viscous fluid universe. Both expressions are tested against the SNIa data of the Union2.1 sample with only marginally different results for the distance-redshift relation and in accordance with the $\Lambda$CDM model. Future observations are expected to be able to discriminate among these models on the basis of indirect measurements of the curvature evolution.Comment: 18 pages, 6 figures, comments and references added, accepted for publication in GR

Estimativas de parâmetros genéticos para intervalos de partos em vacas da raça Canchim.

Com o objetivo de se obter estimativas de parâmetros genético e fenotipicos, foram estudadas as observações sobre intervalos de partos em 495 fêmeas da raça Canchim criadas em regime de pasto na EMBRAPA-UEPAE, de São Carlos, SP

Efeito da arcelina na biologia de Zabrotes subfasciatus (Bohemann, 1833) (Coleoptera-bruchidae).

A proteina arcelina constitui-se em alternativa promissora para o controle de Zabrotes subfasciatus, importante praga do feijao (Phaseolus vulgaris) armazenado. Nas progenies de dez casais, avaliou-se o efeito de quatro variantes de arcelina (Arc1, Arc2, Arc3, Arc4), comparativamente aos controles suscetiveis 'Porrillo 70' e 'Goiano Precoce'. Os parametros avaliados foram: oviposicao, insetos emergidos, periodo ovo-adulto, razao sexual, proporcao e longevidade de machos e femeas. O menor numero medio de ovos foi observado em Arc1 (20,1) e Arc3 (28,2), seguidos por Arc4 (35,7), Arc2 (36,0), 'Porrillo 70' (44,2) e 'Goiano Precoce' (50,1). Em todos os tratamentos a postura foi iniciada no primeiro dia de vida sendo que o periodo de oviposicao mais longo foi observado e, 'Goiano Precoce' (12 dias) e o menor em Arc1, Arc3 e Arc4 (7 dias). Na oviposicao, do segundo ate o quinto dia, detectou-se a maior emergencia. O menor numero medio de insetos emergidos ocorreu em Arc1 e Arc2, seguidos por Arc3, Arc4, 'Porrillo 70' e 'Goiano Precoce', respectivamente, com 3,3;8,1; 18,2; 22,1; 27,5 e 33,9 insetos. Nas linhagens contendo arcelina, o periodo ovo-adulto foi alongado, sendo de 43,7; 36,5; 37,5; 36,6; 32,4 e 31,1 dias, respectivamente, para Arc1, Arc2, Arc3, Arc4, 'Porrillo 70' e 'Goiano Precoce'. A menor longevidade dos adultos foi observada em Arc1 e, com excecao dessa linhagem, foi maior nos machos que nas femeas. A razao sexual (0,52-0,54), e a proporcao entre machos e femeas (1:1,08-1:1,20), nao foi afetada pela (...

Crossbreeding and new beef cattle breeds in Brazil.

Crossbreeding and new beef cattle breeds in Brazil.198