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- Kanai, M, et al.
(author)
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- 2023
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swepub:Mat__t
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| 11. |
- Fallot-Burghardt, W, et al.
(author)
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Touch&Type: a novel pointing device for notebook computers
- 2006
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In: Proceedings of the 4th Nordic Conference on Human-Computer interaction: Changing Roles (Oslo, Norway, October 14 - 18, 2006). NordiCHI '06, ACM Press. ; 189:1, s. 465-468
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Journal article (peer-reviewed)abstract
- The widespread use of the mouse as an input device fornotebook computers indicates that many users are reluctantto use alternative built-in pointing devices. We present anovel input method called Touch&Type which is meantto overcome some of the drawbacks encountered withconventional built-it pointing devices. Touch&Typecombines a conventional keyboard with an extended touchpad whereby the touch pads sensitive area is formed by thesurface of the keys themselves and thus can be made aslarge as the whole key area. A comparative study ofpointing operation is presented with a Touch&Typeprototype in comparison with the mouse and theconventional touch pad. While the mouse outperformed itstwo counterparts, Touch&Type was found to be superiorto the conventional touch pad (after a short learning period) with a confidence level of 73%. The study investigated pointing operation only, not taking homing time into account.
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| 12. |
- Speirs, Mathew, et al.
(author)
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On the Transformation Behavior of NiTi Shape-Memory Alloy Produced by SLM
- 2016
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In: Shape Memory and Superelasticity. - : Springer. - 2199-3858 .- 2199-384X. ; 2:4, s. 310-316
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Journal article (peer-reviewed)abstract
- Selective laser melting has been applied as a production technique of nickel titanium (NiTi) parts. In this study, the scanning parameters and atmosphere control used during production were varied to assess the effects on the final component transformation criteria. Two production runs were completed: one in a high (~1800 ppm O2) and one in a low-oxygen (~220 ppm O2) environment. Further solution treatment was applied to analyze precipitation effects. It was found that the transformation temperature varies greatly even at identical energy densities highlighting the need for further in-depth investigations. In this respect, it was observed that oxidation was the dominating factor, increased with higher laser power adapted to higher scanning velocity. Once the atmospheric oxygen content was lowered from 1800 to about 220 ppm, a much smaller variation of transformation temperatures was obtained. In addition to oxidation, other contributing factors, such as nickel depletion (via evaporation during processing) as well as thermal stresses and textures, are further discussed and/or postulated. These results demonstrated the importance of processing and material conditions such as O2 content, powder composition, and laser scanning parameters. These parameters should be precisely controlled to reach desired transformation criteria for functional components made by SLM.
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| 13. |
- Speirs, Mathew, et al.
(author)
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The effect of SLM parameters on geometrical characteristics of open porous NiTi scaffolds
- 2013
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In: High Value Manufacturing: Advanced Research in Virtual and Rapid Prototyping - Proceedings of the 6th International Conference on Advanced Research and Rapid Prototyping, VR@P 2013. - Leiria, Portugal : CRC Press. - 9781138001374 ; , s. 309-314
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Conference paper (peer-reviewed)abstract
- Selective Laser Melting (SLM) is a promising technique for the production of biometallic scaffolds for orthopaedic applications. To produce successful scaffolds, the laser parameters should be carefully selected in order to achieve open porosity especially when pores are <1000 μm. In this study, we investigate the effect of different laser parameters (capable to produce dense bulk NiTi samples) on production of scaffolds with open porosities of 1000 μm and varying strut thicknesses 100-300 μm. Two different sets of laser parameters were used: 40W laser power with 160 mm/s scanning velocity and 250W with 1000 mm/s, corresponding to low and high laser parameters respectively. Micro-CT scanning experiments were carried out to illustrate the limitations of laser parameters in production of open porous scaffolds. Volume fraction and closed porosity were assessed. It was found that a large CAD mismatch was observed in the building (XZ) direction and internal porosity appears within struts of the samples produced with high laser processing parameters. The residual particles on struts were also shown to increase as strut thickness increases.
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