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Haute Ecole d'Ingénierie

Design optimization of a 2D blade by means of milling tool path

Vessaz, Christian ; Tournier, Christophe ; Münch, Cécile ; Avellan, François

In: CIRP Journal of Manufacturing Science and Technology, 2013, vol. 6, no. 3, p. 157–166

In a conventional design and manufacturing process, turbine blades are modeled based on reverse engineering or on parametric modeling with Computer Fluids Dynamics (CFD) optimization. Then, only raises the question of the manufacturing of the blades. As the design does not take into account machining constraints and especially tool path computation issues in flank milling, the actual performance...

Haute Ecole d'Ingénierie

Tribologie : revêtements TiSiC par pulvérisation cathodique

Matthey, Joël ; Constantin, Raymond ; Bidaux, Jacques-Eric

In: Swiss Engineering, Dossier Matériaux et techniques des surfaces, 2013, no. Avril, p. 30-31

La tribologie, cette science qui étudie les phénomènes susceptibles de se produire entre deux systèmes matériels en contact, immobiles ou animés de mouvements relatifs, est un sujet d’étude en vogue à la Haute Ecole Arc Ingénierie. La participation de la HES-SO Valais a permis de fabriquer par technologie des poudres un matériau remarquable, le carbure de titane-silicium (TiSiC) qui,...

Haute Ecole d'Ingénierie

Porous titanium by powder injection moulding of titanium hydride and PMMA space holders

Carreño-Morelli, Efrain ; Amherd Hidalgo Alexandra ; Rodriguez Arbaizar Mikel ; Zufferey, Daniel ; Várez, Alejandro ; Bidaux, Jacques-Eric

In: European Cells and Materials, 2013, vol. 26, no. Suppl. 4, p. 16

Porous titanium is used as implant material because of its high specific strength, bone-like stiffness, biocompatibility and good bone cell ingrowth provided that the open pores have sizes between 100 μm and 500μm. Powder metallurgy has been successfully used to produce titanium foams by using the space holder method. Recently, Ti grade 4 has been obtained by powder injection moulding (PIM) of...

Haute Ecole d'Ingénierie

Opportunities and limits of in vitro cytotoxicity test methods exemplified by powder metallurgy titanium alloys

Pusnik, Mascha ; Bruinink, Arie ; Rodriguez-Arbaizar, Mikel ; Carreño-Morelli, Efrain ; Zinn, Manfred

In: European Cells and Materials, 2013, vol. 26, no. Suppl. 4, p. 44

Testing for in vitro cytotoxicity aims at obtaining data for a test material from simplified in vitro systems that can be used to make a prognosis for a key step within the processes occurring after implantation in the human body. Depending on the application of the test specimens, one can choose from a number of different assays to assess its bioacceptance in terms of absence of cytotoxicity....

Haute Ecole d'Ingénierie

Quels ingénieurs pour la Suisse de demain?

Bonvin, Dominique ; Bonvin, Michel

In: AEU-Bulletin, 2013, no. 2, p. 7-14

Cet article décrit l’évolution de la profession d’ingénieur de part le monde, et en Suisse en particulier. A partir de l’observation d’une société en mutation, on étudie les nouveaux défis qui se présentent à l’ingénieur et on en déduit l’impact sur le métier et la formation d’ingénieur. On aborde ensuite la relation entre la formation et le monde du travail et...

Haute Ecole d'Ingénierie

A modular methodology for the development of urban energy planning support software

Ouhajjou, Nadj ; Palensky, Peter ; Stifter, Matthias ; Page, Jessen ; Fenz, Stefan ; Tjoa, A. Min

In: Industrial Electronics Society, IECON 2013 - 39th Annual Conference of the IEEE, 2013, p. 7558-7563

Two-thirds of the overall primary energy in the world is consumed in cities, resulting in 71 percent of all energy related greenhouse gas emissions. There are many ongoing initiatives to develop strategies to lower the high amount of emissions at the level of cities. However, energy planners face problems that are related to the complexity of the urban energy systems, encapsulating the components...

Haute Ecole d'Ingénierie

Positive lightning flashes recorded on the Säntis tower from May 2010 to January 2012

Romero, Carlos ; Rachidi, Farhad ; Rubinstein, Marcos ; Paolone, Mario ; Rakov, Vladimir A ; Pavanello, Davide

In: Journal of Geophysical Research, Atmospheres, 2013, vol. 18, no. 12, p. 879–892

We analyze currents of 30 positive flashes recorded on the Säntis tower, Switzerland, from May 2010 to January 2012. The currents were classified into two types. Type 1 events exhibit a large, unipolar main pulse with a risetime of tens of microseconds, followed by subsidiary peaks separated by millisecond-scale intervals. The main pulse in three flashes was preceded by a slowly rising ramp...

Haute Ecole d'Ingénierie

Schlieren laser Doppler flowmeter for the human optical nerve head with the flicker stimuli

Geiser, Martial ; Truffer, Frederic ; Evequoz, Hugo ; Khayi, Hafid ; Mottet, Benjamin ; Chiquet, Christophe

In: Journal of Biomedical Optics, 2013/18/12/127001/1-127001/5

We describe a device to measure blood perfusion for the human optic nerve head (ONH) based on laser Doppler flowmetry (LDF) with a flicker stimuli of the fovea region. This device is self-aligned for LDF measurements and includes near-infrared pupil observation, green illumination, and observation of the ONH. The optical system of the flowmeter is based on a Schlieren arrangement which collects...

Haute Ecole d'Ingénierie

Compact portable biosensor for arsenic detection in aqueous samples with Escherichia coli bioreporter cells

Truffer, Frederic ; Buffi, Nina ; Merulla, Davide ; Beggah, Siham ; van Lintel, Harald ; Renaud, Philippe ; van der Meer, Jan Roelof ; Geiser, Martial

In: Review of Scientific Instruments, 2014, vol. 85, no. 015120, p. 4

We present a compact portable biosensor to measure arsenic As(III) concentrations in water using Escherichia coli bioreporter cells. Escherichia coli expresses green fluorescent protein in a linearly dependent manner as a function of the arsenic concentration (between 0 and 100μg/L). The device accommodates a small polydimethylsiloxane microfluidic chip that holds the agarose-encapsulated...