Simulation of the Process Step Polymer Removal in Indirect Metal Laser Sintering

With the Indirect Metal Laser Sintering and by means of a heat treatment in an oven process metal components can be produced. In the first step the polymer is transformed from the solid state into the gas phase. This takes place all over the component at different velocities depending on the local temperatures and temperature gradients. The creation of the gas phase develops a pressure inside of the component because the diffusion of the polymer within the part has a finite velocity. The pressure may contribute to a damage of the component. This essay deals with the procedure to simulate the gas pressure on the basis of the implementation of kinetic models in the Finite-Element-Analysis.Mechanical Engineerin

Ultrasonic Doppler measurement of renal artery blood flow

An extensive evaluation of the practical and theoretical limitations encountered in the use of totally implantable CW Doppler flowmeters is provided. Theoretical analyses, computer models, in-vitro and in-vivo calibration studies describe the sources and magnitudes of potential errors in the measurement of blood flow through the renal artery, as well as larger vessels in the circulatory system. The evaluation of new flowmeter/transducer systems and their use in physiological investigations is reported

Semper Venalis: Gower\u27s Avaricious Lawyers

The first three chapters of the sixth book of the Vox Clamantis (lines 1-248) comprise a harsh critique of the many avaricious lawyers who, in Gower’s opinion, have come to dominate their profession to the disadvantage of English society in the late fourteenth century. Driven exclusively by their appetite for possessions, they have forgotten the biblical model presented in Psalm 14 that specifies the obligation of the good man to assist without recompense his neighbor’s search for justice. Falsely claiming to be men of law and inheritors of the biblical model of the good man, the causidici (as Gower calls his lawyers) are in reality the sons of error and have abandoned charity for cupidity. Weaving a dense fabric of legal argumentation based upon Roman-canon, common, and customary law, Gower shows how his contemporaries in the legal profession have committed themselves to the world’s false values and lost sight of the most important Law, whose protection they have accordingly forsaken

Information efficiency in the EU ETS during Phase III

This study examines the market efficiency of the European Union Emission Trading Scheme (EU ETS). Since 2005 it has seen increased importance and growth in trading volume. The EU ETS is the largest emission trading system by transaction volume and in this study tests if the market exhibits predictability of prices. It tests whether overreaction or momentum exists in the carbon price and if so, whether profitable trading strategies can be employed. The thesis documents short term overreaction and momentum along various time-series within the EU ETS. Statistically significant alphas were found in a number of strategies tested. These strategies provide excess returns that remain achievable even after transaction costs have been taken into consideration. The results provide evidence that the EU ETS in Phase III is not informationally efficient.Este estudo examina a eficiência do mercado do Regime de Comércio de Licenças de Emissões da União Europeia (RCLE-UE). Neste mercado, desde 2005, tem vindo a registar se um aumento da atividade comercial e um rápido crescimento. O RCLE-UE é o maior sistema de comércio de emissões em volume de transação. Este estudo testa se o mercado apresenta previsibilidade de preços. Mais precisamente, testa se existe uma reação excessiva ou momentum no preço do carbono e, caso exista, se podem ser utilizadas estratégias comerciais rentáveis. A tese documenta uma reacção excessiva e com momentum, a curto prazo, ao longo de várias séries temporais dentro do CELE da UE. Foram encontrados alfas estatisticamente significativos numa série de estratégias testadas. Estas estratégias proporcionam retornos em excesso que permanecem viáveis mesmo depois de os custos de transacção terem sido tomados em consideração. Assim, os resultados fornecem provas de que o CELE UE na Fase III não é eficiente do ponto de vista informativo

An Open Source Approach for Modern Teaching Methods: The Interactive TGUI System

In order to facilitate teaching complex topics in an interactive way, the authors developed a computer-assisted teaching system, a graphical user interface named TGUI (Teaching Graphical User Interface). TGUI was introduced at the beginning of 2009 in the Austrian Journal of Statistics (Dinges and Templ 2009) as being an effective instrument to train and teach staff on mathematical and statistical topics. While the fundamental principles were retained, the current TGUI system has been undergone a complete redesign. The ultimate goal behind the reimplementation was to share the advantages of TGUI and provide teachers and people who need to hold training courses with a strong tool that can enrich their lectures with interactive features. The idea was to go a step beyond the current modular blended-learning systems (see, e.g., Da Rin 2003) or the related teaching techniques of classroom-voting (see, e.g., Cline 2006). In this paper the authors have attempted to exemplify basic idea and concept of TGUI by means of statistics seminars held at Statistics Austria. The powerful open source software R (R Development Core Team 2010a) is the backend for TGUI, which can therefore be used to process even complex statistical contents. However, with specifically created contents the interactive TGUI system can be used to support a wide range of courses and topics. The open source R packages TGUICore and TGUITeaching are freely available from the Comprehensive R Archive Network at http://CRAN.R-project.org/.

Ultrasonic Doppler measurement of renal artery blood flow

Studies were made of (1) blood flow redistribution during lower body negative pressure (LBNP), (2) the profile of blood flow across the mitral annulus of the heart (both perpendicular and parallel to the commissures), (3) testing and evaluation of a number of pulsed Doppler systems, (4) acute calibration of perivascular Doppler transducers, (5) redesign of the mitral flow transducers to improve reliability and ease of construction, and (6) a frequency offset generator designed for use in distinguishing forward and reverse components of blood flow by producing frequencies above and below the offset frequency. Finally methodology was developed and initial results were obtained from a computer analysis of time-varying Doppler spectra