Konzepte von Physiognomie und Rasse bei Martius

This article analyzes the concept of race and ethnographic description used by the bavarian botanist Carl Friedrich Philipp von Martius in his publications on Brazil. Principally Blumenbach’s and Meiners’ racial theories and the concept of physiognomy are applied to explain Martius’ strategies to describe and classify the indigenous people he came across during his voyage to Brazil

O discurso protestante sobre a germanidade no Brasil: observações baseadas no periódico Der deutsche Ansiedler 1864-1908

Este artigo analisa o discurso protestante alemão sobre a imigração alemã no Brasil com base no periódico Der deutsche Ansiedler. O consenso central deste discurso é a preservação da germanidade e do protestantismo no Brasil, incluindo uma auto-imagem positiva e uma imagem negativa do outro. O discurso constrói várias ameaças a este consenso

Exploring the Applicability of Sinterjoining to Combine Additively Manufactured Ceramic Components

This paper examines the general applicability of sinterjoining for combining the advantages of Ceramic Injection Molding (CIM) and Additive Manufacturing (AM) as well as different AM processes. To do so, the geometric tolerance, the pre-sintering temperature and the co-sintering time are varied exemplarily on samples produced by vat photopolymerization (VPP) to minimize the force required for inserting the bodies and to maximize the degree of sintering. The results show that degrees of sintering larger 90 % can be obtained reproducibly. Thus, sinterjoining can be considered as a promising approach for combining the advantages of several ceramic manufacturing processes

Effects of Different Levels of Abstraction Simulating Heat Sources in FEM Considering Drilling

AbstractThis paper presents a comparison of three different methods of simulating heat sources in 3D-FEM-simulations with various levels of abstraction for drilling. The investigated methods are modelled and evaluated with respect to calculation time and accuracy of simulated temperature fields and phase transformations. Results are showing a significant variance of the maximum temperature and temperature distribution for the three different heat sources although the same amount of energy is used in the simulation model. According to the longest simulation time the most detailed heat source provides a realistic temperature distribution

Influence of initial powder layer thickness and focus deviation on the properties of hybrid manufactured parts by Laser Powder Bed Fusion

In hybrid-additive manufacturing using powder bed fusion with laser beam (PBF-LB) conventionally manufactured base-bodies are overprinted with an individual geometry. In this paper, the influence of deviations of the initial layer thickness, and the focal plane on the component properties are investigated. For separate consideration of the individual effects, purely additive (AlSi10Mg) and hybrid-additive (AlSi10Mg on EN AW6082) test specimens were manufactured. The layer thickness was varied from 0 to 200 µm, and the focal plane between 0 and -8 mm. The influence on the microstructure due to the altered induced energy input is analyzed. These findings are correlated with respect to the tensile strength and material hardness. The highest strength is achieved with an initial layer thickness of 50 µm. A hardness decrease of 8 % due to hot stress cracks in the interface is avoided by targeted shifting of the focal plane