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1.
  • Kovacs-Krausz, Zoltan, et al. (creator_code:aut_t)
  • Revealing the band structure of ZrTe5 using multicarrier transport
  • 2023
  • record:In_t: Physical Review B. - 2469-9969 .- 2469-9950. ; 107:7
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • The layered material ZrTe5 appears to exhibit several exotic behaviors, which resulted in significant interest recently, although the exact properties are still highly debated. Among these we find a Dirac/Weyl semimetallic behavior, nontrivial spin textures revealed by low-temperature transport, and a potential weak or strong topological phase. The anomalous behavior of resistivity has been recently elucidated as originating from band shifting in the electronic structure. Our work examines magnetotransport behavior in ZrTe5 samples in the context of multicarrier transport. The results, in conjunction with ab initio band structure calculations, indicate that many of the transport features of ZrTe5 across the majority of the temperature range can be adequately explained by the semiclassical multicarrier transport model originating from a complex Fermi surface.
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3.
  • Benz, W., et al. (creator_code:aut_t)
  • The CHEOPS mission
  • 2021
  • record:In_t: Experimental Astronomy. - : Springer Science and Business Media LLC. - 0922-6435 .- 1572-9508. ; 51:1, s. 109-151
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • The CHaracterising ExOPlanet Satellite (CHEOPS) was selected on October 19, 2012, as the first small mission (S-mission) in the ESA Science Programme and successfully launched on December 18, 2019, as a secondary passenger on a Soyuz-Fregat rocket from Kourou, French Guiana. CHEOPS is a partnership between ESA and Switzerland with important contributions by ten additional ESA Member States. CHEOPS is the first mission dedicated to search for transits of exoplanets using ultrahigh precision photometry on bright stars already known to host planets. As a follow-up mission, CHEOPS is mainly dedicated to improving, whenever possible, existing radii measurements or provide first accurate measurements for a subset of those planets for which the mass has already been estimated from ground-based spectroscopic surveys. The expected photometric precision will also allow CHEOPS to go beyond measuring only transits and to follow phase curves or to search for exo-moons, for example. Finally, by unveiling transiting exoplanets with high potential for in-depth characterisation, CHEOPS will also provide prime targets for future instruments suited to the spectroscopic characterisation of exoplanetary atmospheres. To reach its science objectives, requirements on the photometric precision and stability have been derived for stars with magnitudes ranging from 6 to 12 in the V band. In particular, CHEOPS shall be able to detect Earth-size planets transiting G5 dwarf stars (stellar radius of 0.9R⊙) in the magnitude range 6 ≤ V ≤ 9 by achieving a photometric precision of 20 ppm in 6 hours of integration time. In the case of K-type stars (stellar radius of 0.7R⊙) of magnitude in the range 9 ≤ V ≤ 12, CHEOPS shall be able to detect transiting Neptune-size planets achieving a photometric precision of 85 ppm in 3 hours of integration time. This precision has to be maintained over continuous periods of observation for up to 48 hours. This precision and stability will be achieved by using a single, frame-transfer, back-illuminated CCD detector at the focal plane assembly of a 33.5 cm diameter, on-axis Ritchey-Chrétien telescope. The nearly 275 kg spacecraft is nadir-locked, with a pointing accuracy of about 1 arcsec rms, and will allow for at least 1 Gbit/day downlink. The sun-synchronous dusk-dawn orbit at 700 km altitude enables having the Sun permanently on the backside of the spacecraft thus minimising Earth stray light. A mission duration of 3.5 years in orbit is foreseen to enable the execution of the science programme. During this period, 20% of the observing time is available to the wider community through yearly ESA call for proposals, as well as through discretionary time approved by ESA’s Director of Science. At the time of this writing, CHEOPS commissioning has been completed and CHEOPS has been shown to fulfill all its requirements. The mission has now started the execution of its science programme.
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5.
  • Femenias, Paula, 1966, et al. (creator_code:aut_t)
  • Improving the market up-take of energy producing solar shading: A communication model to discuss preferences for architectural integration across different professions
  • 2017
  • record:In_t: Proceedings of th9th Nordic Conference on Construction Economics and Organization, 13-14 June, 2017 at Chalmers University of Technology, Göteborg, SWEDEN. ; , s. 140-151
  • swepub:Mat_conferencepaper_t (swepub:level_refereed_t)abstract
    • Electricity producing solar shading provides possibilities for a combined solution for solar shading andbuilding integrated locally produced energy from renewable sources. The multi-functionality of theseproducts calls for collaboration between a range of actors from manufacturers, clients, architects,engineers, and contractors. Two major challenges for the increased up-take of the technology has beenidentified and is dealt with in a transdisciplinary research project, called ELSA, involving industry andacademic institutions. First, the successful architectural integration of solar shading in terms of form,size, colour, detailing etc. in relation to the overall building design will be decisive in order to persuadearchitects. Second, the development of these multi-functional products to reach functional, technical,economic and aesthetical qualities is dependent upon communication between different professions.As a means to initiate a dialogue between the different professional groups taking part in the ELSAproject, a model, the AIQ-model (Architectural Integration Qualities), to assess preferences forarchitectural integration of energy producing solar shading was developed and tested in a workshop.The results indicate a large consensus across different professional groups when assessing successfularchitectural integrations. Consequently, discrepancies in aesthetic appraisal of energy producing solarshading should not be the main hindrance for a broader implementation of such solutions. The challengerather lies in that architectural integration qualities will concur with other important aspects of themulti-functional solution, and not all professional groups will put architectural integration qualitiesabove other functions. The workshop shows that the AIQ model serves its function to initiate and tofocus discussions. The value of group discussions to reach consensus was also observed. The AIQmodel provide definitions to clarify the judgment base behind aesthetic assessments that wasappreciated but all groups but most easily applied by the architects. The model should be furtherdeveloped to include also other aspects than aesthetics.
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6.
  • Femenias, Paula, 1966, et al. (creator_code:aut_t)
  • Improving the Market Up-take of Energy Producing Solar Shading: Experiences from Three Cases of Retrofit
  • 2017
  • record:In_t: Proceedings from the World Sustainable Built Environment Conference 2017 Hong Kong 5-7 June. ; , s. 682-688
  • swepub:Mat_conferencepaper_t (swepub:level_refereed_t)abstract
    • The paper presents the test of a multi-value framework for the evaluation of energy producing solar shading on three cases of Swedish retrofitting projects. The evaluation framework was developed in collaboration between academics and industry partners in a transdisciplinary research project and considers: energy production, indoor environment and comfort, visibility and communication, aesthetics, design and process, and maintenance and repair. Results show that the model even though having few criteria gives a general and comprehensive feed-back about the outcomes, challenges and success of the projects. None of the projects scores high in all aspects,instead they exemplify different approaches to energy producing solar shading. All three have shading and low maintenance as important criteria for design. Furthermore, the availability of subsidies to add solar energy production to the shading has been decisive for choosing that solution. Case 1 has had energy production as an important driver and no architect was involved while in Case 3, being a listed building, aesthetics has been crucial.Case 2 shows a way forward with a good collaboration between the actors and a compromise between shading,energy production and aesthetics which respect the original design.
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7.
  • Haegermark, Maria, 1984, et al. (creator_code:aut_t)
  • Economic feasibility of solar photovoltaic rooftop systems in a complex setting: A Swedish case study
  • 2017
  • record:In_t: Energy. - : Elsevier BV. - 0360-5442 .- 1873-6785. ; 127, s. 18-29
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • An economic feasibility study of solar photovoltaic rooftop (PV) systems in Swedish multifamily buildings was carried out to examine the effects of current market conditions, incentive programmes, and building-specific parameters. Economic analyses were conducted for 108 electricity supply points for scenarios including (1) a tax rebate, (2) an investment subsidy, and (3) both tax rebate and subsidy. First, PV systems were sized and oriented to give the highest net present values, considering actual fuse sizes and hourly demands matched to simulated PV generation. This resulted in shares of profitable systems as follows: 33% with a tax rebate, 51% with a subsidy, and 93% with both. It was shown that the tax rebate programme promotes relatively large systems compared to the subsidy, although with a much higher risk. Thereafter, the influences of main fuse size and existing roofs were investigated. Most of the roofs were large enough to fit the previously sized PV systems. However, taking into account the slopes and directions of available rooftops considerably reduced the number of profitable systems. Finally, the study showed that in addition to support measures and other economic conditions, the PV system feasibility was highly sensitive to roof characteristics, electricity demand and fuse size.
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8.
  • Haegermark, Maria, 1984, et al. (creator_code:aut_t)
  • Profitability of Solar Photovoltaic Rooftop Systems in Buildings with Medium Sized Loads
  • 2017
  • record:In_t: Proceedings of the 11th ISES Eurosun 2016 Conference. - Freiburg, Germany : International Solar Energy Society. - 9783981465969 ; , s. 1218-1227
  • swepub:Mat_conferencepaper_t (swepub:level_refereed_t)abstract
    • In Sweden, it is generally most feasible to install solar photovoltaics (PV) primarily for self-consumption, as long as there either is a large enough load when the sun shines or that over-generation is generously compensated. Currently there are two support schemes for PV: a capital subsidy and a tax rebate for grid feed-ins. However, the latter is not available for systems above.1.00A, thus making self-consumption highly important for these systems. This paper studies the profitability of systems connected to loads from 100 to 700 MWh, most of them above 100A. In particular, it compares multi-family buildings to other building types. Analyses were based on measured electricity use matched to simulated PV yield and current market conditions. Calculations were conducted with and without consideration of existing roofs. In general, the supply points in multi-family buildings had less favorable load profiles than the ones in other buildings, which resulted in lower self-sufficiencies as well as relatively lower profitability and smaller system sizes. The support schemes turned out to be crucial for the profitability in most cases, but not all. For supply points in other building types with loads above 300 MWh profitable systems were found also without a subsidy. Taking areas and orientations of existing roofs into consideration drastically decreased the share of profitable systems.
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9.
  • Håkansson, Maria, et al. (creator_code:aut_t)
  • SOL:AR Beställarstöd för solenergiinvesteringar genom avancerad visualisering
  • 2019
  • swepub:Mat_report_t (swepub:level_scientificother_t)abstract
    • The solar energy business has developed rapidly in Sweden in recent years, but so far most companies and individuals have chosen to install solar cells on roofs. Another relatively unexplored resource that we argue offer potential and where we see an emerging trend for various solar solutions, is building facades. In contexts where lack of space prevents building new or standalone solar energy installments, facades can still be used for a range of purposes, e.g., generating renewable solar power and/or provide space for shading devices and thereby reduced demand for cooling. In the SOL:AR project we have investigated how a future digital visualization tool could make it easier for clients who are considering solar solutions, including categories of products like solar cells, building-integrated photovoltaics (BIPV) and solar shading. How could a digital tool give a quick insight into e.g., the profitability of solar cells or a solar shading solution on a certain façade, and how would these look aesthetically? A long term aim in the project is to stimulate the development of facades as a resource that opens for new opportunities for solar solutions. Through interviewing potential target groups like property owners and other key actors about their needs and requests regarding a digital tool, mapping out technical possibilities as well as legal and organizational aspects, we have investigated the prerequisites for such a tool. We have identified property owners as our primary target group, and in particular medium-sized property owners with commercial buildings, although there seems to be an increasing interest in solar solutions also in tenant owners’ associations and apartment buildings. In total, at least 30 people from property companies, trade organizations, solar energy companies, governmental agencies, and urban planning offices have participated in our interviews and workshops respectively and contributed their thoughts and needs about how a digital visualization tool could create value in the procurement of solar solutions for facades. The results from the study suggest that a digital visualization tool could create value for property owners if it triggers the interest for solar solutions early in a renovation-/rebuilding process; is easy to use for people regardless of role at the property company or tenant owners’ association; can provide an idea of how a certain solar solution would look along with an estimation of economic and environmental benefits (rather than exact calculations); can support the communication about solar solutions between property owners and tenants; can be used “in the field” at a certain building as well as in the office; is owned by a neutral actor and is free of charge for property owners to use. Together with insights from the technical state-of-the art mapping and legal issues, we have gathered these user-oriented insights in a list of requirements for a future tool. To conclude the project, we conducted a workshop with invited actors from the visualization and solar shading industry to secure the relevance of the technical requirement list and identify further important questions for a future development phase. Future challenges include identifying a neutral owner for the tool, identify a reasonable payment model, as well as implementing the tool step-wise while waiting for necessary technical advances in the area of augmented reality and 3D data respectively.
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10.
  • Kovacs-Krausz, Zoltan, et al. (creator_code:aut_t)
  • Electrically Controlled Spin Injection from Giant Rashba Spin-Orbit Conductor BiTeBr
  • 2020
  • record:In_t: Nano Letters. - : American Chemical Society (ACS). - 1530-6992 .- 1530-6984. ; 20:7, s. 4782-4791
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Ferromagnetic materials are the widely used source of spin-polarized electrons in spintronic devices, which are controlled by external magnetic fields or spin-transfer torque methods. However, with increasing demand for smaller and faster spintronic components utilization of spin-orbit phenomena provides promising alternatives. New materials with unique spin textures are highly desirable since all-electric creation and control of spin polarization is expected where the strength, as well as an arbitrary orientation of the polarization, can be defined without the use of a magnetic field. In this work, we use a novel spin-orbit crystal BiTeBr for this purpose. Because of its giant Rashba spin splitting, bulk spin polarization is created at room temperature by an electric current. Integrating BiTeBr crystal into graphene-based spin valve devices, we demonstrate for the first time that it acts as a current-controlled spin injector, opening new avenues for future spintronic applications in integrated circuits.
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