Considerações em torno da educação sexual das crianças

Traz algumas considerações acerca da educação sexual infantil. Apresenta alguns aspectos da doutrina freudiana da personalidade e da sexualidade

Causal inference to formalize responsibility analyses in road safety epidemiology

Journées GDR/SFB, BORDEAUX, FRANCE, 05-/10/2017 - 06/10/2017The last few decades have seen the Structural Causal Model framework provide valuable tools to assess causal effects from observational data. In this article, we briefly review recent results regarding the recoverability of causal effects from selection biased data, and apply them to the case of responsibility analyses in road safety epidemiology. Our objective is to formally determine whether causal effects can be unbiasedly estimated through this type of analyses, when available data are restricted to severe accidents, as it is commonly the case in practice. However, because speed has a direct effect on the severity of the accident, we show that the causal odds-ratio of exposures that influence speed, such as alcohol, is not estimable. We present numerical results to illustrate our arguments, the magnitude of the bias and to discuss some recent results from real data

Corporate Tax Rates and the Purchasing Power Parity Doctrine

This thesis analyzes the effect of corporate tax rates on the purchasing-power-parity (PPP) doctrine. The data used to test this hypothesis are drawn from the U. S., the U. K., the Federal Republic of Germany, Canada, and Japan. The first chapter introduces the reader to the concepts of the PPP doctrine and states the hypothesis. Chapter 2 reviews the literature on the PPP doctrine. Chapter 3 specifies a model of the PPP doctrine including tax rates. Chapter 4 reports and interprets the findings. The study is summarized and conclusions are drawn in chapter 5. In this study it is shown that tax rates are significant only in the case of the U. S. dollar/Canadian dollar exchange rate

Elastodynamics of a soft strip subject to a large deformation

To produce sounds, we adjust the tension of our vocal cords to shape their properties and control the pitch. This efficient mechanism offers inspiration for designing reconfigurable materials and adaptable soft robots. However, understanding how flexible structures respond to a significant static strain is not straightforward. This complexity also limits the precision of medical imaging when applied to tensioned organs like muscles, tendons, ligaments and blood vessels among others. In this article, we experimentally and theoretically explore the dynamics of a soft strip subject to a substantial static extension, up to 180\%. Our observations reveal a few intriguing effects, such as the resilience of certain vibrational modes to a static deformation. These observations are supported by a model based on the incremental displacement theory. This has promising practical implications for characterizing soft materials but also for scenarios where external actions can be used to tune properties