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- Andersson, Robin, 1990, et al.
(författare)
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Defining gestural interactions for large vertical touch displays
- 2017
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Ingår i: Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics). - Cham : Springer International Publishing. - 1611-3349 .- 0302-9743. ; 10513, s. 36-55, s. 36-55
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Konferensbidrag (refereegranskat)abstract
- As new technologies emerge, so do new ways of interacting with the digital domain. In this paper, the touch interaction paradigm is challenged for use on large touch displays of 65 in. in size. We present a gesture elicitation study with 26 participants carried out on twelve actions commonly used on touch displays. The results and analysis of 312 touch gestures revealed agreement rates for each action. We report several findings including the results of a set of ten unique (and a few secondary) gestures, a taxonomy classifying the defined gestures, a pilot study on the defined gestures, and explicit design implications. We discuss the results and include several important factors for future considerations. We aim at helping future designers and engineers to design interactions for large touch displays.
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| 2. |
- Andersson, Robin, 1990, et al.
(författare)
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EMBRACE: The emotion sharing bracelet
- 2015
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Ingår i: Proceedings of SIDeR’15 – student interaction design research conference.
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Konferensbidrag (refereegranskat)abstract
- In this study we present Embrace; a wearable device that explores the potential of wearable technology harnessing the affordance of human form and deformable displays. We research new ways of communicating with loved ones in order to improve the experience of connectedness when they are apart. Embrace is a wearable device in the form of a bracelet that shares emotion between peers by providing both visual and haptic feedback. Other devices like smartphones and tablets have a rigid form and material. In contrast, the deformable display used in Embrace enables the user to wear the technology seamlessly on the body. The haptic feedback for sharing emotions is believed to provide a different experience since the physical sensation is more close to feeling heartbeats, hugs, and skin contact, compared to only visual information of today’s mobile devices.
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| 3. |
- Andersson, Jonas, 1990
(författare)
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Deactivation of diesel oxidation catalysts
- 2006
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- To meet the demand for heavy- and light-duty diesel vehicles on expansive markets while complying with current and future emission standards, it is necessary to reinsure the long-livety of the applied exhaust aftertreatment technology. Loss of catalytic performance may be associated with environmental as well as economical consequences. To aid the development of improved exhaust control components, such as the diesel oxidation catalyst (DOC), and optimise the use of raw materials, methods for accelerating the deactivation process are used. Catalysts can be aged in an engine-bench setup to simulate conditions in the field and thereby shorten the test procedure. The most resource efficient approach relies on using synthetic aging procedures to achieve such effect, which is the main focus of this thesis.To confirm a relevant effect of thermal and chemical deactivation, model DOCs were prepared and exposed to a variety of conditions, including atmospheres containing SO2 and H2O, prior to characterisation of activity for CO oxidation, Pt dispersion, BET surface area, C3H6 adsorption capacity (TPD) and surface composition (XPS). Hydrothermal treatment affected the HC trap function, critical for cold-start performance, and catalytic activity. Sulfur, adsorbed during low-temperature exposure, was the main cause for loss of Pt dispersion and activity for CO oxidation despite removal of the major part of SO2 in succeeding heat treatment. A fresh commercial DOC (0 km) was subjected to different aging procedures and compared to samples dismantled from vehicles with different driving distance and sulfur content in the fuel. The deactivation of the vehicle-aged catalysts was confirmed by measuring emission levels in dynamometer tests and in lab reactor measurements. A similar degree of deactivation was observed, from flow reactor experiments and TEM analysis of Pt sintering, by using a 15-30 h rapid aging procedure combining poisoning at low temperature with (hydro)thermal treatment. The different sources of catalyst poisoning were studied with XPS. While S and Zn could be removed in reducing atmosphere at 700ºC, results confirmed that P and Ca cause irreversible chemical deactivation of the vehicle-aged catalysts. The strong interaction of the sulfates with the washcoat, shown for both aging methods, highlights the importance of using low-sulfur diesel fuel. The described methods for rapid aging can be used for simulating catalyst poisoning in general terms, where accumulation of poisons during long-term exposure to diesel exhaust of low temperature is of concern. Hydrothermal treatment mimic periods of higher engine load and exotherms from regeneration processes.
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| 5. |
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| 6. |
- Andersson, Jonas, 1990
(författare)
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The effects of sulfur dioxide, water and temperature on the deactivation of model diesel oxidation catalysts
- 2006
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Ingår i: Book of Extended Abstacts, DECHEMA e.V., Frankfurt am Main, Germany. ; :2006, s. 91-96
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- With the aim to simulate ageing of catalysts on a laboratory scale and to develop methods for accelerated deactivation, model diesel oxidation catalysts were exposed to synthetic diesel exhaust gases in a flow reactor, and the effects of SO2, H2O and temperature on catalyst performance were investigated. Samples based on Pt, -Al2O3 and ZSM-5, and a commercial reference catalyst formed the basis of the model series. Characterisation was performed pre- and post-deactivation with respect to C3H6 adsorption capacity and TPD, BET surface area, CO oxidation, platinum dispersion using CO chemisorption, and quantification of sulfur species using XPS. Ageing conditions were identified for which significant loss in catalyst performance occurred. Hydrothermal treatment was critical to the C3H6 adsorption capacity of the zeolite. Exposure to SO2 affected a number of characteristics; elevated CO light-off temperature and a decrease in Pt dispersion, primarily due to blocking of Pt sites, and a decrease in BET surface area. XPS analysis showed that low temperature was necessary for sulfur adsorption to occur and that the adsorption process was facilitated by H2O. It was also indicated that adsorbed sulfur species were present on the washcoat even at elevated temperatures. Long-term operation of a catalytic converter with diesel exhausts at relatively low temperature induces chemical deactivation to some extent due to accumulation of sulfur compounds. The results presented here show that a lab model can be used to simulate relevant parts of such behaviour.
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| 10. |
- Bauer, Maris, et al.
(författare)
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Terahertz detection with graphene field-effect transistors
- 2015
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Ingår i: Graphene Week 2015.
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Konferensbidrag (refereegranskat)abstract
- Detectors for quasi-optical and guide THz waves are key elements of any THz technology. In recent years, there has been much progress in their development. Notably, field-effect transistors (FETs) have been shown to be well suited for detector implementation at room temperature exploiting (self-)mixing effects in their channels [1]. They reach a typical noise-equivalent power (NEP) of several tens of pW/Hz^1/2 at 0.6 THz in CMOS and other technologies. First focal-plane arrays and cameras have been implemented. Frequency coverage to at least 5 THz has been demonstrated. Recently, this type of detection concept has been extended successfully to graphene-based FETs [2] opening the way to freely positionable THz detectors on a wide variety of substrates (also flexible plastics). We have improved the technology (see Fig. 1) [3] and reach, for GFETs on Si, an optical NEP of 150 pW/Hz^1/2 at 0.3 THz, with considerable room for improvement. An unusually strong thermoelectric contribution has been identified [2, 3] which may help to engineer enhanced detector performance.
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