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Winterthur, Switzerland

The Zurich University of Applied science located in the city of Winterthur, with facilities in Zurich and Wädenswil, is one of the largest University of Applied science in Switzerland and is part of the Zürcher Fachhochschule.Currently, the university has eight schools, covering architecture and civil engineering, health, linguistics, life science and facility management, applied psychology, social work, engineering and management and law. Wikipedia.

Cantoni M.,Swiss Federal Institute of Technology EPFL | Holzer L.,ZHAW Zurich University of Applied Sciences
MRS Bulletin

This article summarizes recent technological improvements of focused ion beam tomography. New in-lens (in-column) detectors have a higher sensitivity for low energy electrons. In combination with energy filtering, this leads to better results for phase segmentation and quantitative analysis. The quality of the 3D reconstructions is also improved with a refined drift correction procedure. In addition, the new scanning strategies can increase the acquisition speed significantly. Furthermore, fast spectral and elemental mappings with silicon drift detectors open up new possibilities in chemical analysis. Examples of a porous superconductor and a solder with various precipitates are presented, which illustrate that combined analysis of two simultaneous detector signals (secondary and backscattered electrons) provides reliable segmentation results even for very complex 3D microstructures. In addition, high throughput elemental analysis is illustrated for a multi-phase Ni-Ti stainless steel. Overall, the improvements in resolution, contrast, stability, and throughput open new possibilities for 3D analysis of nanostructured materials. © 2014 Materials Research Society. Source

Tobias S.,Swiss Federal Institute of forest | Muller Wahl P.,ZHAW Zurich University of Applied Sciences
Land Use Policy

We investigated the prerequisites of a municipality or region to integrate landscape as a location specific feature in their place branding and whether landscape conservation measures are applied to promote landscape. For this purpose we analysed different landscape conservation measures and accomplished a survey among the municipal councils in the city-region of Zurich. Our results show that landscape can only become a brand of a place, if it is abundant, unique and the only real strength of the place. Hence, only rural regions can promote their landscape as a brand and, therefore, do connect their landscape conservation measures to place branding. Conversely, urban regions generally cannot meet these conditions because, there, landscape is a scarce resource and, compared to other urban qualities (e.g. transport connections), rather a weakness. Nevertheless, the municipal councils around Zurich appreciate their landscape as an important factor of quality of life, whereas they point out rather common landscape qualities, like public access and proximity to residential quarters. The results give evidence that a lack of these landscape qualities is perceived stronger in the negative way than their presence can contribute to a positive image of the place. Consequently, in city-regions, landscape conservation measures are usually applied in a strictly protection-oriented way without any link to place branding. © 2012 Elsevier Ltd. Source

Lanfranchi A.,ZHAW Zurich University of Applied Sciences
School Psychology International

This article examines procedures and processes that result in the over-referral of migrant students to separate special education programmes and, as a consequence, their exclusion from general education. The particular focus is on the role of the school psychologist in this process. The empirical study is a comparison of Swiss teachers’ and school psychologists’ responses to the paper case of a boy with behavioural and learning difficulties whose name and ethnicity was varied so that one version identified him as from an ethnically mainstream, Swiss German background and the other as a migrant and foreign first language speaker. The results show that, compared with teachers, school psychologists’ assessments and choice of interventions demonstrated less cultural bias and higher levels of intercultural competence. These findings support the call that school psychologists have a vital role to play in the reduction of discrimination against migrant students and in the implementation of a more inclusive and equitable education system. © The Author(s) 2014. Source

Righi M.,ZHAW Zurich University of Applied Sciences
Aeronautical Journal

Gas-kinetic theory is also valid in the continuum regime: the Euler and Navier-Stokes equations can be obtained as projection of the Boltzmann equation on to the physical space (x, t). The numerical schemes derived from gas-kinetic theory are computationally more expensive than Navier-Stokes based ones, but offer advantages which have been attracting a growing level of attention: they can (i) accommodate discontinuities at cells interface, (ii) provide high-resolution fluxes, (iii) provide advantages in the simulation of turbulence, (iv) handle hypersonic and / or rarefied flows. This study extends the validation of gas-kinetic schemes investigating a few turbulent flow cases. At a slightly higher computational cost, gas-kinetic schemes provide results comparable to those obtained with well-validated Navier-Stokes schemes using the same turbulence model, grid and reconstruction order. In the case of shock-separated flows, the results obtained with the gas-kinetic scheme are even closer to experimental data. These findings are consistent with the idea that gas-kinetic theory is a physically more consistent framework for investigating the mechanics of fluids. Source

Righi M.,ZHAW Zurich University of Applied Sciences
Communications in Computational Physics

The implementation of a turbulent gas-kinetic scheme into a finite-volume RANS solver is put forward, with two turbulent quantities, kinetic energy and dissipation, supplied by an allied turbulence model. This paper shows a number of numerical simulations of flow cases including an interaction between a shock wave and a turbulent boundary layer, where the shock-turbulent boundary layer is captured in a much more convincing way than it normally is by conventional schemes based on the Navier-Stokes equations. In the gas-kinetic scheme, the modeling of turbulence is part of the numerical scheme, which adjusts as a function of the ratio of resolved to unresolved scales of motion. In so doing, the turbulent stress tensor is not constrained into a linear relation with the strain rate. Instead it is modeled on the basis of the analogy between particles and eddies, without any assumptions on the type of turbulence or flow class. Conventional schemes lack multiscale mechanisms: the ratio of unresolved to resolved scales - very much like a degree of rarefaction - is not taken into account even if it may grow to non-negligible values in flow regions such as shocklayers. It is precisely in these flow regions, that the turbulent gas-kinetic scheme seems to provide more accurate predictions than conventional schemes. © 2014 Global-Science Press. Source

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