The development of the concept of conservation in Australian aboriginal children

This study describes the application of Piaget's tests of conservation of quantity, weight, volume, length, area and number to two groups of Aboriginal children living on mission stations in the Northern Territory of Australia. The first part of the thesis is devoted to a consideration of the theoretical background of the study. In the first chapter Piaget 1 s general theory of intellectual development is outlined, and the problem of the comparative study of intellectual development is considered. It is pointed out that little research in this area has been undertaken, and reasons for this neglect are suggested. Levy-Bruhl's theory of primitive thinking is reviewed, and the parallels between the theories of Piaget and Levy-Bruhl are discussed. It is suggested that the techniques developed by Piaget in his study of the intellectual development of children could be applied to the study of intellectual development in primitive peoples, and that these techniques could be used to test Levy-Bruhl's theory. The implications of Piaget's theory and its relation to other problems in psychology are also discussed. In the second chapter the theoretical basis of the tests used in the present study is outlined, and in Chapter III a number of related studies are reviewed. The second part of the thesis deals with the study itself..

An Object-Based Approach to Modelling and Analysis of Failure Properties

In protection systems, when traditional technology is replaced by software, the functionality and complexity of the system is likely to increase. The quantitative evidence normally provided for safety certification of traditional systems cannot be relied upon in software-based systems. Instead there is a need to provide qualitative evidence. As a basis for the required qualitative evidence, we propose an object-based approach that allows modelling of both the application and software domains. From the object class model of a system and a formal specification of the failure properties of its components, we generate a graph of failure propagation over object classes, which is then used to generate a graph in terms of object instances in order to conduct fault tree analysis. The model is validated by comparing the resulting minimal cut sets with those obtained from the fault tree analysis of the original system. The approach is illustrated on a case study based on a protection system from..

A coleção entomológica da Embrapa Amazônia Oriental: situação atual e perspectivas futuras.

Organizadores: Arion Tulio Aranda e Silvana Carvalho Thiengo