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  • 1.
    Elbashir, Sana
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Broström, Markus
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Skoglund, Nils
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Thermodynamic modelling assisted three-stage solid state synthesis of high purity β-Ca3(PO4)22024In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 238, article id 112679Article in journal (Refereed)
    Abstract [en]

    A three-stage solid state synthesis assisted by thermodynamic modelling was developed to prepare highly pure (>99 %) beta tricalcium phosphate (β-TCP) powder. The optimal synthesis temperature was experimentally determined to be 1000 °C in good agreement with the theoretical calculations. The synthesis design described here has substantially improved the product quality and eliminated the presence of secondary phosphate phases compared to one- and two-stage methods investigated in this work. A comprehensive characterization of the material's structural, vibrational, and morphological characteristics was conducted. Rietveld refinement of the X-ray diffraction data confirmed the high purity of the samples. The crystal structure of the prepared β-TCP was determined and the refined unit cell parameters agreed well with the reference values. From infrared and Raman spectral analyses, the characteristics of β-TCP were observed and discussed in details. Furthermore, the morphology and elemental composition of the products were examined and found to be homogenous and impurity free. The reproducibility of the material was scrutinized and showed no significant data variations. Using our three-stage synthesis method, it is possible to produce β-TCP powder of high purity with consistent repeatability.

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  • 2.
    Mousavi, Abbas
    et al.
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    Berggren, Martin
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    Wadbro, Eddie
    Umeå University, Faculty of Science and Technology, Department of Computing Science. Department of Mathematics and Computer Science, Karlstad University, Karlstad, Sweden.
    Extending material distribution topology optimization to boundary-effect-dominated problems with applications in viscothermal acoustics2023In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 234, article id 112302Article in journal (Other academic)
    Abstract [en]

    A new formulation is presented that extends the material distribution topology optimization method to address boundary-effect-dominated problems, where specific boundary conditions need to be imposed at solid–fluid interfaces. As an example of such a problem, we focus on the design of acoustic structures with significant viscous and thermal boundary losses. In various acoustic applications, especially for acoustically small devices, the main portion of viscothermal dissipation occurs in the so-called acoustic boundary layer. One way of accounting for these losses is through a generalized acoustic impedance boundary condition. This boundary condition has previously been proven to provide accurate results with significantly less computational effort compared to Navier–Stokes simulations. To incorporate this boundary condition into the optimization process at the solid–fluid interface, we introduce a mapping of jumps in densities between neighboring elements to an edge-based boundary indicator function. Two axisymmetric case studies demonstrate the effectiveness of the proposed design optimization method. In the first case, we enhance the absorption performance of a Helmholtz resonator in a narrow range of frequencies. In the second case, we consider an acoustically larger problem and achieve an almost-perfect broadband absorption. Our findings underscore the potential of our approach for the design optimization of boundary-effect-dominated problems.

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  • 3.
    Wiberg, Wiberg
    Umeå University, Faculty of Social Sciences, Department of Informatics.
    Interaction, new materials & computing: Beyond the disappearing computer, towards material interactions2016In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 90, p. 1200-1206Article in journal (Refereed)
    Abstract [en]

    This paper offers new design and theoretical insights into the materiality of interaction. With a point of departure taken in “the material turn” in HCI this work identifies how this has played out in our field as six interlinked approaches – from interaction design with new materials, via craft-based approaches to CHI, to notions that treats the computer as a material and the materiality of computing. This paper takes stock of our community’s reconceptualization of computing through the material turn and then advocate a return to interaction rather than a continued concern for the material status of the computer. In this paper I argue that doing so has fundamental implications for HCI design and research. By articulating a “materiality of interaction” perspective, this paper offers ways of moving forward by developing (1) A unique form-giving practice, (2) An artistic and research-driven explorative account, and (3) the growth of systematic knowledge in our field. I view this focus on the articulation of “the materiality of interaction” as an important contribution to this special issue. In particular since a focus on how interaction is increasingly realized through computational re-activation of traditional (analogue) materials, such as paper or wood, might be key for understanding emerging material experiences.

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