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Singer F.,Coburg University of Applied Sciences
Physics Procedia | Year: 2015

Anodized aluminum oxide plays a great role in many industrial applications, e.g. in order to achieve greater wear resistance. Since the hardness of the anodized films strongly depends on its processing parameters, it is important to characterize the influence of the processing parameters on the film properties. In this work the elastic material parameters of anodized aluminum were investigated using a laser-based ultrasound system. The anodized films were characterized analyzing the dispersion of Rayleigh waves with a one-layer model. It was shown that anodizing time and temperature strongly influence Rayleigh wave propagation. © 2015 The Authors. Source


Hassaneen A.,Helwan University | Munack A.,Institute of Agriculture Technology and Biosystems Engineering | Ruschel Y.,Institute of Agriculture Technology and Biosystems Engineering | Schroeder O.,Institute of Agriculture Technology and Biosystems Engineering | Krahl J.,Coburg University of Applied Sciences
Fuel | Year: 2012

The effect of RME (Rapeseed Methyl Ester) biodiesel and GTL (Gas-to-Liquid) fuels on the fuel consumption and emission characteristics including particulate matter of diesel engine was investigated. The engine tests were carried out based on the ESC 13-mode test procedure. Particulate Matter (PM) distribution was analyzed using the scanning mobility particle seizer (SMPS). Compared to the base line diesel fuel;biodiesel (RME) emitted up to 70% less specific CO;up to 50% less specific HC;and 60% less specific PM emissions. For RME fuel;the majority of the particle numbers were in the diameter range of 10-30 nm. For the conventional diesel and GTL fuels;the majority of PM emissions were in the diameter range of 30-200 nm. The GTL fuel emitted slightly less specific CO;HC;NO x;and PM than the conventional diesel fuel. The major deficit of the biodiesel fuel was its higher specific fuel consumption rate that was in the range up to 15% (by weight) higher than the other fuels. A relatively higher NO x and CO 2 emission at most of the engine loads was encountered for biodiesel fuel. The CO 2 emission of the GTL fuel was up to 5% lower than the specific CO 2 emission of the other two fuels. © 2012 Elsevier Ltd. All rights reserved. Source


Noll M.,Coburg University of Applied Sciences | Jirjis R.,Swedish University of Agricultural Sciences
Applied Microbiology and Biotechnology | Year: 2012

The demand of renewable energy sources, i.e. biomass, is steadily increasing worldwide to reduce the need of fossil energy sources. Biomass such as energy crops, woody species, forestry and agricultural residues are the most common renewable energy sources. Due to uneven demand for wood fuel, the material is mostly stored outdoors in chip piles or as logs until utilisation. Storage of biomass is accompanied by chemical, physical and biological processes which can significantly reduce the fuel quality. However, heating plants require high-quality biomass to ensure efficient operation, thereby minimising maintenance costs. Therefore, optimised storage conditions and duration times for chipped wood and tree logs have to be found. This paper aims at reviewing available knowledge on the pathways of microbial effects on stored woody biomass and on investigations of the fungal and bacterial community structure and identity. Moreover, potential functions of microorganisms present in wood chip piles and logs are discussed in terms of (1) reduction of fuel quality, (2) catalysing selfignition processes, and (3) constituting health risk and unfriendly work environment. © Springer-Verlag 2011. Source


Hiltmann K.,Coburg University of Applied Sciences
Procedia Engineering | Year: 2015

For the prediction of failures of technical systems, a new method has been found which can be used in addition to the established methods FMEA and AFD. It is based on the idea of describing a system by means of a set of standard system parameters. The values of these are varied and the effects of the varied parameters are assessed. Since a failure as a faulty system state is one set of parameter values among others, it is expected to show up by their variation. This procedure does not require knowledge of the specific failure type. © 2015 The Authors. Published by Elsevier Ltd. Source


Heinrich M.,Coburg University of Applied Sciences
International Journal of Visual Design | Year: 2016

Evolution shaped our eyes and brains, and the conditions of natural environments and processes-far exceeding human control options-determined which of our perceptional competences were suited best to find our way and to survive in woods or savannas. The act of recognizing and interpreting patterns of natural appearances, transitions, and metamorphoses was-and still is-the daily bread of our visual perception. Our associative intelligence stores and cross-connects this stream of experience; by analogy, it uses these patterns to decode the unknown and the unfamiliar, to find the most appropriate and probable accordances as a reference for forthcoming interactions. Gestalt psychology and psychology of perception have investigated the emergence of separable forms out of the visual field and preferences of stimulus selection. But the more complex question of evaluation, meaningful classification, and integration of forms and structures within our visual experience still is an interdisciplinary challenge for aesthetics, semiotics, psychology, philosophy, and architectural/design theory and discourse. In this article, parameters of instantaneous visual attraction associated with properties of natural environments (e.g., anthropomorphic, biomorphic, or dynamikomorphic aspects) are described and systematically related to general modes of visual perception. They are exemplified by means of tangible design matters, and methods are discussed regarding how they can be made applicable and teachable. The idea of perceptual organization by patterns of transition and metamorphosis, outlined by psycho-morphology, is transferred to aesthetics and thus complements the terms "anthropomorphism" and "biomorphism" with the new term "dynamikomorphism." A differentiated system of perspectives on design phenomenons that is able to define and to create successful design is outlined. Source

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