Resumo O desenvolvimento de impressoras 3D permitiu uma maior produção de peças e próteses médicas provenientes de polímeros termoplásticos como PLA e ABS, para produção de filamentos. Este trabalho avaliou as características mecânicas de próteses impressas, em determinada temperatura, de filamento PLA. Foram impressos diversos corpos de provas, para a realização de testes de tração, verificando que a configuração com densidade 100%, espessura de 0,4 mm e direção de impressão de 45° e 135° apresentou melhor resultado de resistência mecânica. Realizaram-se também, simulações matemáticas para análise de resistência à queda e flambagem. O conjunto de testes físicos e matemáticos determinou que o PLA não atendeu os requisitos para aplicação deste como próteses. Palavras-chave: PLA, polímero, impressora 3D, próteses.

Article history: Received 23 June 2017 Received in revised form 3 August 2017 Accepted 5 August 2017 Irregularly shaped rigid bodies, which move with high velocity through a resistive medium, take specific stable orientations during the motion. The paper shows physical models for estimation of the center of pressure for irregularly shaped bodies and for assessing the dynamic stability of such bodies. Using the developed physical models and the results of numerical simulations for the body of an irregular shape (a geometry similar to the fragments of high explosive projectile), a center of pressure and stability analysis was performed for the given body. It has been shown, based on rotation about one axis, that there is a zone of stability for the body in certain orientations, but to determine it more precisely it is necessary to continuously change two angles about two mutually perpendicular axes that perpendicular to the velocity vector of the center of mass. Generally, for each body, there is an orientation in which the body is in a stable zone (oscillation around the center of mass), but it is difficult to find that zone since one has to perform an extremely large number of numerical simulations for each body of a different shape.

Foreign Direct Investments and Tourism: Empirical Evidence From Turkey Elma SATROVIC, PhD Cag University, Turkey, elmasatrovic@cag.edu.tr Adnan MUSLIJA, MBA PhD candidate at University of Sarajevo, Bosnia and Herzegovina, adnanmuslija@msn.com ABSTRACT This study investigates the nature of causal relationship, if any, between tourism (TOUR) and foreign direct investments (FDI) using the case of Turkey. The observed period is between 1995 and 2015. In order to examine the existence of cointegration between the selected variables, the Johansen test for cointegration is applied. Moreover, the study applies the Granger causality procedure in a vector autoregression (VAR) model in order to estimate the relationship between the variables and the direction of relationship. VAR model is estimated following AIC information criteria that offers 5 lags. Findings indicate that the null hypothesis on no cointegration between the variables can be rejected. Therefore, evidence on the long run relationship between FDI and TOUR in Turkey can’t be rejected. In addition, Granger causality test indicates a positive relationship running from FDI to TOUR. Besides that, a positive relationship running from TOUR to FDI is also reported. Therefore, the Granger causality test indicates a bidirectional relationship between FDI and TOUR in Turkey in the short run. © 2017 PESA All rights reserved. Keywords: Tourism, Foreign Direct Investment, Cointegration, Causality, Turkey