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1.
  • Liu, Jiewei, et al. (creator_code:aut_t)
  • Thermohydrodynamics of boiling in binary compressible fluids
  • 2015
  • record:In_t: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics. - : AMER PHYSICAL SOC. - 1539-3755 .- 1550-2376. ; 92:4
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • We numerically study the thermohydrodynamics of boiling for a CO2 + ethanol mixture on lyophilic and lyophobic surfaces in both closed and open systems, based on a diffuse interface model for a two-component system. The corresponding wetting boundary conditions for an isothermal system are proposed and verified in this paper. New phenomena due to the addition of another component, mainly the preferential evaporation of the more volatile component, are observed. In the open system and the closed system, the physical process shows very different characteristics. In the open system, except for the movement of the contact line, the qualitative features are rather similar for lyophobic and lyophilic surfaces. In the closed system, the vortices that are observed on a lyophobic surface are not seen on a lyophilic surface. More sophisticated wetting boundary conditions for nonisothermal, two-component systems might need to be further developed, taking into account the variations of density, temperature, and surface tension near the wall, while numerical results show that the boundary conditions proposed here also work well even in boiling, where the temperature is nonuniform.
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2.
  • Lācis, Uǧis, 1988-, et al. (creator_code:aut_t)
  • Nanoscale sheared droplet : volume-of-fluid, phase-field and no-slip molecular dynamics
  • 2022
  • record:In_t: Journal of Fluid Mechanics. - : Cambridge University Press. - 0022-1120 .- 1469-7645. ; 940
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • The motion of the three-phase contact line between two immiscible fluids and a solid surface arises in a variety of wetting phenomena and technological applications. One challenge in continuum theory is the effective representation of molecular motion close to the contact line. Here, we characterize the molecular processes of the moving contact line to assess the accuracy of two different continuum two-phase models. Specifically, molecular dynamics simulations of a two-dimensional droplet between two moving plates are used to create reference data for different capillary numbers and contact angles. We use a simple-point-charge/extended water model. This model provides a very small slip and a more realistic representation of the molecular physics than Lennard-Jones models. The Cahn-Hilliard phase-field model and the volume-of-fluid model are calibrated against the drop displacement from molecular dynamics reference data. It is shown that the calibrated continuum models can accurately capture droplet displacement and droplet break-up for different capillary numbers and contact angles. However, we also observe differences between continuum and atomistic simulations in describing the transient and unsteady droplet behaviour, in particular, close to dynamical wetting transitions. The molecular dynamics of the sheared droplet provide insight into the line friction experienced by the advancing and receding contact lines. The presented results will serve as a stepping stone towards developing accurate continuum models for nanoscale hydrodynamics.
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3.
  • Tahir, Abdul Malik, et al. (creator_code:aut_t)
  • Behaviour of master alloy during sintering of PM steels : redistribution and dimensional variations
  • 2015
  • record:In_t: Powder Metallurgy. - 0032-5899 .- 1743-2901. ; 58:2, s. 133-141
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • The addition of alloying elements in low alloyed PM steels in the form of a master alloy gives the advantage of introducing oxidation sensitive but less expensive elements and also allows manipulation in composition adjustment to achieve desired properties. In this work, interrupted sintering trials of the Fe-2MA-0.5C (%) (MA = Cu based master alloy) are performed. The behaviour of the liquid forming master alloy, for instance in terms of liquid phase formation, alloying element redistribution and effect on the dimensional changes, is investigated. The results show that master alloy particles melt over a range of temperature, which is also supported by the thermodynamic calculations. The low swelling in the master alloy system, compared to a reference system of Fe-2Cu-0.5C, is attributed to the progressive melting of the master alloy. The mean diffusion distance of Cu in Fe at the interparticle boundaries is 5.8 mu m after 34 min of isothermal holding.
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4.
  • Tahir, Abdul Malik, et al. (creator_code:aut_t)
  • Cu redistribution during sintering of Fe–2Cu and Fe–2Cu–0·5C compacts
  • 2014
  • record:In_t: Powder Metallurgy. - 0032-5899 .- 1743-2901. ; 57:5, s. 373-379
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • The effective use of alloying elements in powder metallurgical steels requires a deep understanding of their redistribution kinetics during sintering. In this work, interrupted sintering trials of Fe–2Cu and Fe–2Cu–0·5C compacts were performed. Moreover, diffusion simulations of Cu in γ-Fe using Dictra were performed. It is found that transient liquid phase penetrates the Fe interparticle and grain boundaries in less than 3 min of holding time. However, C addition limits the penetration of liquid Cu, particularly into grain boundaries of large Fe particles. The results also show that the mean diffusion distance of Cu in γ-Fe in the C added system is slightly lower than that in the C-free system at 3 min of holding time; however, after 33 min, the mean diffusion distance is similar in both systems. The diffusion distances of Cu in γ-Fe, predicted by Dictra, are in good agreement with the measured values.
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5.
  • Tahir, Abdul Malik, et al. (creator_code:aut_t)
  • Investigation of Cu distribution and porosity in Fe-2Cu and Fe-2Cu-0.5C compacts
  • 2013
  • record:In_t: International Powder Metallurgy Congress and Exhibition, Euro PM 2013. - : EPMA. - 9781899072408
  • swepub:Mat_conferencepaper_t (swepub:level_refereed_t)abstract
    • The distribution of the alloying element Cu in steel compacts is important in determining the properties of the sintered products. In this work, mixtures of Fe-2Cu and Fe-2Cu-0.5C were compacted at 600 MPa and sintered at 1120oC for the holding times of ts= 3, 13, 23, and 33 min. Dilatometry and light optical microscopy is used to investigate porosity, Cu distribution and its effect on the dimensional changes during sintering. The result shows that the molten Cu penetrates into the Fe interparticle and grain boundaries in less then 3 min holding time at 1120°C, however C addition hinders the liquid penetration of Cu. Furthermore, it is found that the C-added compact has lower volume expansion and porosity compared to the C-free system, after 33 min of holding time at 1120°C.
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6.
  • Walters, Michael L., et al. (creator_code:aut_t)
  • Evaluating the Robot Personality and Verbal Behavior of Domestic Robots Using Video-Based Studies
  • 2011
  • record:In_t: Advanced Robotics. - 0169-1864 .- 1568-5535. ; 25:18, s. 2233-2254
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Robots are increasingly being used in domestic environments and should be able to interact with inexperienced users. Human-human interaction and human-computer interaction research findings are relevant, but often limited because robots are different from both humans and computers. Therefore, new human-robot interaction (HRI) research methods can inform the design of robots suitable for inexperienced users. A video-based HRI (VHRI) methodology was here used to carry out a multi-national HRI user study for the prototype domestic robot BIRON (BIelefeld RObot companioN). Previously, the VHRI methodology was used in constrained HRI situations, while in this study HRIs involved a series of events as part of a 'home-tour' scenario. Thus, the present work is the first study of this methodology in extended HRI contexts with a multi-national approach. Participants watched videos of the robot interacting with a human actor and rated two robot behaviors (Extrovert and Introvert). Participants' perceptions and ratings of the robot's behaviors differed with regard to both verbal interactions and person following by the robot. The study also confirms that the VHRI methodology provides a valuable means to obtain early user feedback, even before fully working prototypes are available. This can usefully guide the future design work on robots, and associated verbal and non-verbal behaviors.
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7.
  • Andersson Schwarz, Jonas, 1978-, et al. (creator_code:aut_t)
  • Introducing the panspectric challenge : A reconfiguration of regulatory values in a multiplatform media landscape
  • 2013
  • record:In_t: Central European Journal of Communication. - Wroclaw, Polen. - 1899-5101. ; 6:2, s. 219-233
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Taking Sweden as a case study, the role of public service broadcasting (PSB) is explored, with a focus on issues of data retention and innovation that accompany web distribution. The issue of predicting audience preferences by means of data retention is investigated, and the related problem of organizational autonomy when interacting with commercial actors in the digital sphere. We hypothesize that previous tendencies towards paternalism might be equally supplemented by tendencies towards so-called “panspectric” surveillance and tracking, given a technological environment where such practices are increasingly common. We argue that the absence of advertising partially helps keep these broadcasters from panspectric temptation. Still, practices such as Facebook integration entail a panspectric element. We ask whether the potential increase in the efficacy of targeting audiences promised by panspectric practices might be offset by its negative impact on civic accountability. Is there a possibility for a “benign,” democratically accountable panspectrocism?
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8.
  • Hansen, Kjetil Falkenberg, 1972-, et al. (creator_code:aut_t)
  • Analysis of a genuine scratch performance
  • 2004
  • record:In_t: Lecture Notes in Computer Science. - Berlin, Heidelberg : Springer Berlin/Heidelberg. - 0302-9743 .- 1611-3349. - 9783540210726 ; 2915, s. 477-478, s. 519-528
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • The art form of manipulating vinyl records done by disc jockeys (DJs) is called scratching, and has become very popular since its start in the seventies. Since then turntables are commonly used as expressive musical instruments in several musical genres. This phenomenon has had a serious impact on the instrument-making industry, as the sales of turntables and related equipment have boosted. Despite of this, the acoustics of scratching has been barely studied until now. In this paper, we illustrate the complexity of scratching by measuring the gestures of one DJ during a performance. The analysis of these measurements is important to consider in the design of a scratch model.
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9.
  • Jonsson, Martin, 1973-, et al. (creator_code:aut_t)
  • The aesthetics of heat : Guiding awareness with thermal stimuli
  • 2016
  • record:In_t: TEI 2016 - Proceedings of the 10th Anniversary Conference on Tangible Embedded and Embodied Interaction. - New York, NY, USA : Association for Computing Machinery (ACM). - 9781450335829 ; , s. 109-117
  • swepub:Mat_conferencepaper_t (swepub:level_refereed_t)abstract
    • In this paper we discuss the design process and results from a design exploration on the use of thermal stimuli in body awareness exercises. A user-study was performed on an interactive prototype in the form of an interactive heat mat. The paper brings forth an alternative understanding of heat as a design material that extends the common understanding of thermal stimuli in HCI as a communication modality to instead bring the aesthetic and experiential properties to the fore. Findings account for felt body experiences of thermal stimuli and a number of design qualities related to heat as a design material are formulated, pointing to experiential qualities concerning the felt body, subjectivity and subtleness as well as material qualities concerning materiality, inertia and heat transfer.
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10.
  • Landwehr Sydow, Sophie, 1987-, et al. (creator_code:aut_t)
  • Machine Sensibility : Unpacking the Embodied and Situated Dimensions of 3D Printing
  • 2020
  • record:In_t: NordiCHI '20: Proceedings of the 11th Nordic Conference on Human-Computer Interaction. - New York : Association for Computing Machinery (ACM). - 9781450375795 ; , s. 1-13
  • swepub:Mat_conferencepaper_t (swepub:level_refereed_t)abstract
    • This paper offers a conceptual contribution to understand 3D printing practice. We have studied conversations between 3D printing practitioners who discuss failed and discarded printed artifacts and analyzed how they make sense of the printing process. Based on findings of interactions with the machine itself, materials used, and designs applied, this study contributes to the field of HCI by highlighting the embodied and situated dimensions of 3D printing. Introducing the concept of machine sensibility, we characterize our findings around: i) assessing printability, ii) monitoring and intervening and iii) reading the prints. We use the term machine to highlight the importance of understanding the materiality of the 3D printer, and sensibility, to address critical interactions and abilities that surfaced in studying this practice. The concept allows researchers to put 3D printing practice in the context of contemporary interaction design research and helps to understand challenges of material-machine-design interdependencies.
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