TY  - JOUR
A1  - Fischer, Jan-Thomas
A1  - Kowalski, Julia
A1  - Pudasaini, Shiva P.
T1  - Topographic curvature effects in applied avalanche modelling
JF  - Cold Regions Science and Technology
N2  - This paper describes the implementation of topographic curvature effects within the RApid Mass MovementS (RAMMS) snow avalanche simulation toolbox. RAMMS is based on a model similar to shallow water equations with a Coulomb friction relation and the velocity dependent Voellmy drag. It is used for snow avalanche risk assessment in Switzerland. The snow avalanche simulation relies on back calculation of observed avalanches. The calibration of the friction parameters depends on characteristics of the avalanche track. The topographic curvature terms are not yet included in the above mentioned classical model. Here, we fundamentally improve this model by mathematically and physically including the topographic curvature effects. By decomposing the velocity dependent friction into a topography dependent term that accounts for a curvature enhancement in the Coulomb friction, and a topography independent contribution similar to the classical Voellmy drag, we construct a general curvature dependent frictional resistance, and thus propose new extended model equations. With three site-specific examples, we compare the apparent frictional resistance of the new approach, which includes topographic curvature effects, to the classical one. Our simulation results demonstrate substantial effects of the curvature on the flow dynamics e.g., the dynamic pressure distribution along the slope. The comparison of resistance coefficients between the two models demonstrates that the physically based extension presents an improvement to the classical approach. Furthermore a practical example highlights its influence on the pressure outline in the run out zone of the avalanche. Snow avalanche dynamics modeling natural terrain curvature centrifugal force friction coefficients.
KW  - Snow
KW  - Avalanche
Y1  - 2012
U6  - https://doi.org/10.1016/j.coldregions.2012.01.005
SN  - 1872-7441
VL  - 74-75
SP  - 21
EP  - 30
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Pieper, Martin
A1  - Klein, Peter
T1  - Application of simple, periodic homogenization techniques to non-linear heat conduction problems in non-periodic, porous media
JF  - Heat mass transfer
N2  - Often, detailed simulations of heat conduction in complicated, porous media have large runtimes. Then homogenization is a powerful tool to speed up the calculations by preserving accurate solutions at the same time. Unfortunately real structures are generally non-periodic, which requires unpractical, complicated homogenization techniques. We demonstrate in this paper, that the application of simple, periodic techniques to realistic media, that are just close to periodic, gives accurate, approximative solutions. In order to obtain effective parameters for the homogenized heat equation, we have to solve a so called “cell problem”. In contrast to periodic structures it is not trivial to determine a suitable unit cell, which represents a non-periodic media. To overcome this problem, we give a rule of thumb on how to choose a good cell. Finally we demonstrate the efficiency of our method for virtually generated foams as well as real foams and compare these results to periodic structures.
Y1  - 2012
U6  - https://doi.org/10.1007/s00231-011-0879-4
SN  - 0947-7411
VL  - 48
IS  - 2
SP  - 291
EP  - 300
PB  - Springer
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Fateri, Miranda
A1  - Hötter, Jan-Steffen
A1  - Gebhardt, Andreas
T1  - Experimental and Theoretical Investigation of Buckling Deformation of Fabricated Objects by Selective Laser Melting
JF  - Physics Procedia
N2  - Although Selective Laser Melting (SLM) process is an innovative manufacturing method, there are challenges such as inferior mechanical properties of fabricated objects. Regarding this, buckling deformation which is caused by thermal stress is one of the undesired mechanical properties which must be alleviated. As buckling deformation is more observable in hard to process materials, silver is selected to be studied theoretically and experimentally for this paper. Different scanning strategies are utilized and a Finite Element Method (FEM) is applied to calculate the temperature gradient in order to determine its effect on the buckling deformation of the objects from experiments.
Y1  - 2012
U6  - https://doi.org/10.1016/j.phpro.2012.10.062
SN  - 1875-3892
N1  - Part of special issue "Laser Assisted Net shape Engineering 7 (LANE 2012)"
VL  - 39
SP  - 464
EP  - 470
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - BOOK
A1  - Wosnitza, Franz
A1  - Hilgers, Hans Gerd
T1  - Energieeffizienz und Energiemanagement : ein Überblick heutiger Möglichkeiten und Notwendigkeiten
Y1  - 2012
SN  - 978-3-8348-1941-3
N1  - eISBN 978-3-8348-8671-2
PB  - Springer Spektrum
CY  - Wiesbaden
ER  - 
TY  - BOOK
A1  - Janser, Frank
A1  - Havermann, Marc
T1  - Inkompressible Strömungen
Y1  - 2012
SN  - 978-3-86130-446-3
N1  - Strömungslehre und Aerodynamik
PB  - Mainz
CY  - Aachen
ER  - 
TY  - JOUR
A1  - Jochim, Haldor E.
T1  - Die Ostheidebahn - eine Alternative zur Y-Trasse
JF  - ETR - Eisenbahntechnische Rundschau
Y1  - 2012
SN  - 0013-2845
VL  - 61
IS  - 11
SP  - 34
EP  - 37
PB  - DVV Media Group
CY  - Hamburg
ER  - 
TY  - GEN
A1  - Baumgartner, Thomas
A1  - Wunderlich, Florian
A1  - Jaunich, Arthur
A1  - Sato, Tomoo
A1  - Bundy, Georg
A1  - Grießmann, Nadine
A1  - Kowalski, Julia
A1  - Burghardt, Stefan
A1  - Hanebrink, Jörg
T1  - Lighting the way: Perspectives on the global lighting market
Y1  - 2012
CY  - McKinsey
ET  - 2nd ed.
ER  - 
TY  - CHAP
A1  - Funke, Harald
A1  - Börner, Sebastian
A1  - Keinz, Jan
A1  - Kusterer, K.
A1  - Kroninger, D.
A1  - Kitajima, J.
A1  - Kazari, M.
A1  - Horikama, A.
T1  - Numerical and experimental characterization of low NOx Micromix combustion principle for industrial hydrogen gas turbine applications
T2  - Proceedings of ASME Turbo Expo 2012
Y1  - 2013
N1  - ASME Turbo Expo 2012, GT2012, June 11-15, 2012, Copenhagen, Denmark
ER  - 
TY  - CHAP
A1  - Funke, Harald
A1  - Börner, Sebastian
A1  - Keinz, Jan
A1  - Hendrick, P.
A1  - Recker, E.
T1  - Low NOx Hydrogen combustion chamber for industrial gas turbine applications“, 14th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery
T2  - ISROMAC-14 : the Forteenth International Symposium on Transport Phenomena and Dynamics of Rotating Machinery ; Honolulu, Hawaii, February 27 - March 02nd, 2012
Y1  - 2012
N1  - International Symposium on Transport Phenomena and Dynamics of Rotating Machinery ; (14 ; 2012.02.27-03.02 ; Honolulu, Hawaii)
ER  - 
TY  - JOUR
A1  - Kirstein, Simon
A1  - Müller, Karsten
A1  - Walecki-Mingers, Mark
A1  - Deserno, Thomas M.
T1  - Robust adaptive flow line detection in sewer pipes
JF  - Automation in construction
N2  - As part of a novel approach to automatic sewer inspection, this paper presents a robust algorithm for automatic flow line detection. A large image repository is obtained from about 50,000 m sewers to represent the high variability of real world sewer systems. Automatic image processing combines Canny edge detection, Hough transform for straight lines and cost minimization using Dijkstra's shortest path algorithm. Assuming that flow lines are mostly smoothly connected horizontal structures, piecewise flow line delineation is reduced to a process of selecting adjacent line candidates. Costs are derived from the gap between adjacent candidates and their reliability. A single parameter α enables simple control of the algorithm. The detected flow line may precisely follow the segmented edges (α = 0.0) or minimize gaps at joints (α = 1.0). Both, manual and ground truth-based analysis indicate that α = 0.8 is optimal and independent of the sewer's material. The algorithm forms an essential step to further automation of sewer inspection.
Y1  - 2012
U6  - https://doi.org/10.1016/j.autcon.2011.05.009
SN  - 1872-7891 (E-Journal) ; 0926-5805 (Print)
IS  - 21
SP  - 24
EP  - 31
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - CHAP
A1  - Ganegedara, H.
A1  - Alahakoon, D.
A1  - Mashford, J.
A1  - Paplinski, A.
A1  - Müller, Karsten
A1  - Deserno, T. M.
T1  - Self organising map based region of interest labelling for automated defect identification in large sewer pipe image collections
T2  - The 2012 International Joint Conference on Neural Networks (IJCNN) : 10 - 15 June 2012, Brisbane, Australia ; [part of the] 2012 IEEE World Congress on Computational Intelligence (IEEE-WCCI 2012)
Y1  - 2012
SN  - 978-1-4673-1490-9
PB  - IEEE
CY  - Piscataway, NJ
ER  - 
TY  - CHAP
A1  - Sauerborn, Markus
A1  - Hoffschmidt, Bernhard
A1  - Telle, R.
A1  - Wagner, M.
T1  - Heatable optical analyse system for high temperature absorbers
T2  - 30th ISES Biennial Solar World Congress 2011 : : Kassel, Germany, 28 August - 2 September 2011. Vol. 5
Y1  - 2012
SN  - 978-1-61839-364-7
SP  - 3852
EP  - 3860
PB  - Curran
CY  - Red Hook, NY
ER  - 
TY  - CHAP
A1  - Sauerborn, Markus
A1  - Arshadi, S.
A1  - Rohrmoser, R.
T1  - Influence of clouds and aerosols to the haze of the sunshape
T2  - 30th ISES Biennial Solar World Congress 2011 : Kassel, Germany, 28 August - 2 September 2011. Vol. 5
Y1  - 2012
SP  - 3887
EP  - 3894
PB  - Curran
CY  - Red Hook, NY
ER  - 
TY  - CHAP
A1  - Feuerriegel, Uwe
A1  - Wittenhorst, Simon
A1  - Hoffmann, Ulrich
A1  - Pook, Michael
T1  - Simulation von Wärmeübertragungsprozessen
T2  - Tagungsband zur AALE-Tagung 2012 : 9. Fachkonferenz
Y1  - 2012
SN  - 978-3-8356-3305-6
N1  - AALE 2012
SP  - 127
EP  - 136
PB  - Oldenbourg Industrieverlag
CY  - München
ER  - 
TY  - BOOK
A1  - Wosnitza, Franz
A1  - Hilgers, Hans Gerd
T1  - Energieeffizienz und Energiemanagement : Ein Überblick heutiger Möglichkeiten und Notwendigkeiten
Y1  - 2012
SN  - 978-3-8348-8671-2
PB  - Vieweg + Teubner
CY  - Wiesbaden
ER  - 
TY  - JOUR
A1  - Blecken, Udo
A1  - Holthaus-Sellheier, Ursula
T1  - Quantitative Prognoseverfahren für Mietpreise von Bueroimmobilien am Beispiel Düsseldorf
JF  - GuG : Grundstücksmarkt und Grundstückswert
Y1  - 2012
SN  - 0938-0175
VL  - 23
IS  - 1
SP  - 12
EP  - 21
PB  - Werner
CY  - Köln
ER  - 
TY  - JOUR
A1  - Schneider, Bettina
A1  - Schneider, Wilhelm
T1  - Jahresabschluss nach BilMoG : Ansatz-, Ausweis- und Bewertungsvorschriften
JF  - Das Wirtschaftsstudium : wisu ; Zeitschrift für Ausbildung, Examen, Berufseinstieg und Fortbildung
Y1  - 2012
SN  - 0340-3084
VL  - 41
IS  - 4
SP  - 529
EP  - 535
PB  - Lange
CY  - Düsseldorf
ER  - 
TY  - JOUR
A1  - Spelthahn, Heiko
A1  - Kirsanov, Dmitry
A1  - Legin, Andrey
A1  - Osterrath, Thomas
A1  - Schubert, Jürgen
A1  - Zander, Willi
A1  - Schöning, Michael Josef
T1  - Development of a thin-film sensor array for analytical monitoring of heavy metals in aqueous solutions
JF  - Physica Status Solidi (a)
N2  - In industrial processes there is a variety of heavy metals (e.g., copper, zinc, cadmium, and lead) in use for wires, coatings, paints, alloys, batteries, etc. Since the application of these transition metals for industry is inevitable, it is a vital task to develop proper analytical techniques for their monitoring at low activity levels, especially because most of these elements are acutely toxic for biological organisms. The determination of ions in solution by means of a simple and inexpensive sensor array is, therefore, a promising task. In this work, a sensor array with heavy metal-sensitive chalcogenide glass membranes for the simultaneous detection of the four ions Ag⁺, Cu2⁺, Cd2⁺, and Pb2⁺ in solution is realized. The results of the physical characterization by means of microscopy, profilometry, Rutherford backscattering spectroscopy (RBS), and scanning electron microscopy (SEM) as well as the electrochemical characterization by means of potentiometric measurements are presented. Additionally, the possibility to expand the sensor array by polymeric sensor membranes is discussed.
Y1  - 2012
SN  - 1862-6319
U6  - https://doi.org/10.1002/pssa.201100733
VL  - 209
IS  - 5
SP  - 885
EP  - 891
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - CHAP
A1  - Engels, Elmar
A1  - Gabler, T.
T1  - Universelle Programmierschnittstelle für Motion-Logic Systeme
T2  - Tagungsband zur AALE-Tagung 2012 : 9. Fachkonferenz
Y1  - 2012
SN  - 978-3-8356-3305-6
N1  - AALE 2012
SP  - 37
EP  - 46
PB  - Oldenbourg Industrieverlag
CY  - München
ER  - 
TY  - CHAP
A1  - Luszczynski, K.
A1  - Engels, Elmar
T1  - Vergleichende Untersuchung zur Topologie von zelloptimalen, elektromobilitäts-optimierten Ladungsausgleichsvorrichtungen
T2  - Tagungsband zur AALE-Tagung 2012 : 9. Fachkonferenz
Y1  - 2012
SN  - 978-3-8356-3305-6
N1  - AALE 2012
SP  - 165
EP  - 174
PB  - Oldenbourg Industrieverlag
CY  - München
ER  -