A Coupling Scheme for Direct Numerical Simulations with an Acoustic Solver

A code for direct numerical simulations (DNS) has been coupled with an acoustic solver for aeroacoustic applications. The DNS code is intended to compute the noise generation while the acoustic far-field is evaluated using the linearized Euler equations. Both codes run on different computers on which they show their best computational performance. As a test case, we show a pressure pulse emitting from the DNS domain and being propagated by the acoustic solver

Identification and Quantification of Shear Layer Influences on the Generation of Vortex Structures

The analysis of complex flow fields based on the notion of organized motions of flow field features with spatial and temporal coherence, the so-called coherent structures, is one of the principal methods in the development of advanced analysis tools in fluid mechanics. For decades the focus of research was on vortex structures as the only coherent structure of interest, caused by the significant role of these structures in the understanding of the main fluid dynamical events, e.g. turbulence in boundary layers. A new topic is the extension of the flow field analysis by shear layer structures. The consideration of the shear layer structures allow additional informations in dynamical processes, e.g. generation and decay of vortex structures.

Medical students' knowledge and attitudes regarding vaccination against measles, influenza and HPV. An international multicenter study

Introduction: Inaccurate information leads to increased scepticism concerning vaccinations among health care workers. Therefore, a proper education of medical students on vaccination is important. Methods: During summer term 2015, we performed a paper-based survey to identify the knowledge and attitudes of medical students on vaccinations against measles, influenza and HPV in seven medical schools in Germany, Austria and Switzerland. Results: Altogether, 3,652 questionnaires were analyzed. Knowledge of country-specific public recommendations increased significantly with the number of semesters of medical studies. Concerning the knowledge about vaccinations against measles, influenza and HPV, one third of the answers were given correctly. Again, a strong correlation between the knowledge and the semester of medical studies could be observed. The attitudes concerning vaccinations in general and especially for HCWs were highly positive. Conclusions: This study provides some important arguments for the development of a comprehensive vaccination education for medical students

Towards a general collisional radiative model

Collisional Radiative Models (CRMs) are a widely used tool in the modelling of plasmas. The results of such models appear as source terms in the particle and energy balances of plasma transport models. Usually such models calculate a partial Quasi Steady State Solution (QSSS). This means that the spatial and temporal relaxation of must excited state densities is neglected, which is valid for a broad variety of plasmas. Recently a new CRM has been developed which combines two interesting properties: * validity for a broad range of electron densities, as stepwise processes are taken into account; * the number of non-QSS levels can be chosen arbitrarily, generalising the concepts of the so-called coefficients of net ionisation and recombination. As a result of these properties it is possible to fully describe radiative transfer, while simultaneously the model is valid for higher electron densities, as stepwise processes can be taken into account. An application of the model is discussed in a second contribution to this conference ('Radiative Transfer in High-Current Ar-Hg Discharges, Van Dijk et el.). Other research groups are kindly invited to participate in this research