Central African identities and religiosity in colonial Minas Gerais

This study deals with the import of West Central African slaves and their religious practices to Minas Gerais in the eighteenth century. The captaincy of Minas Gerais in the interior of Brazil developed into the world’s largest gold producing region in the beginning of the eighteenth century. The large-scale mining of gold, and later diamonds, was only possible through massive imports of slaves from Africa to Brazil. The first part of this study discusses the Atlantic slave trade in the southern Atlantic world. The discovery of gold in Minas Gerais led to an increasing demand for slaves in Brazil, which was largely met by supplies from Angola. The study analyzes the formation of Central Africans’ identities both in their homelands and in Brazil. Slave identities or “nations” have often been seen as creations of the slave owners. By interpreting major Central African “nations” such as Angola, Congo, and Benguela as regional identities that were tied to the slaves’ origins in Africa, this study offers a new interpretation of what these identities meant for Central Africans in Minas Gerais. The second part of this study concentrates on the religious universe of Central Africans. Processes of cultural creolization affected West Central African societies after the Portuguese landed in the kingdom of Kongo in the late fifteenth century and led to the development of an Atlantic Creole culture. The spread of Catholicism in West Central Africa affected religious life especially in the kingdom of Kongo, in the city of Luanda, and in the Portuguese colony of Angola. Central African religious specialists were often denounced to the authorities in Angola for organizing healing and divination rituals. Diagnosis in these rituals was often made through spirit possession. Central Africans took these healing and divining methods to Minas Gerais, where numerous African religious specialists enjoyed great prominence. In the Brazilian mining region, it was commonplace that African healers served not only the African slave population, but also free whites. In the eighteenth century, Central African popular healers made a significant contribution to the therapeutic arts practiced in Minas Gerais and elsewhere in Brazil.

Weld joint characteristics by nano-materials addition

The need for industries to remain competitive in the welding business, has created necessity to develop innovative processes that can exceed customer’s demand. Significant development in improving weld efficiency, during the past decades, still have their drawbacks, specifically in the weld strength properties. The recent innovative technologies have created smallest possible solid material known as nanomaterial and their introduction in welding production has improved the weld strength properties and to overcome unstable microstructures in the weld. This study utilizes a qualitative research method, to elaborate the methods of introducing nanomaterial to the weldments and the characteristic of the welds produced by different welding processes. The study mainly focuses on changes in the microstructural formation and strength properties on the welded joint and also discusses those factors influencing such improvements, due to the addition of nanomaterials. The effect of nanomaterial addition in welding process modifies the physics of joining region, thereby, resulting in significant improvement in the strength properties, with stable microstructure in the weld. The addition of nanomaterials in the welding processes are, through coating on base metal, addition in filler metal and utilizing nanostructured base metal. However, due to its insignificant size, the addition of nanomaterials directly to the weld, would poses complications. The factors having major influence on the joint integrity are dispersion of nanomaterials, characteristics of the nanomaterials, quantity of nanomaterials and selection of nanomaterials. The addition of nanomaterials does not affect the fundamental properties and characteristics of base metals and the filler metal. However, in some cases, the addition of nanomaterials lead to the deterioration of the joint properties by unstable microstructural formations. Still research are ongoing to achieve high joint integrity, in various materials through different welding processes and also on other factors that influence the joint strength.