| 1. |
- Abrahamsen, Rune, et al.
(författare)
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Dynamic Response of Tall Timber Buildings Under Service Load : The DynaTTB Research Program
- 2020
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Ingår i: EURODYN 2020, XI international conferece on structural dynamics. - : National Technical University of Athens. - 9786188507210 ; , s. 4900-4910
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Konferensbidrag (refereegranskat)abstract
- Wind-induced dynamic excitation is becoming a governing design action determin-ing size and shape of modern Tall Timber Buildings (TTBs). The wind actions generate dynamic loading, causing discomfort or annoyance for occupants due to the perceived horizontal sway – i.e. vibration serviceability failure. Although some TTBs have been instrumented and meas-ured to estimate their key dynamic properties (natural frequencies and damping), no systematic evaluation of dynamic performance pertinent to wind loading has been performed for the new and evolving construction technology used in TTBs. The DynaTTB project, funded by the Forest Value research program, mixes on site measurements on existing buildings excited by heavy shakers, for identification of the structural system, with laboratory identification of building elements mechanical features coupled with numerical modelling of timber structures. The goal is to identify and quantify the causes of vibration energy dissipation in modern TTBs and pro-vide key elements to FE modelers.The first building, from a list of 8, was modelled and tested at full scale in December 2019. Some results are presented in this paper. Four other buildings will be modelled and tested in spring 2020.
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| 2. |
- Abrahamsen, Rune, et al.
(författare)
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Dynamic response of tall timber buildings under service load : results from the dynattb research program
- 2023
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Ingår i: World Conference on Timber Engineering 2023 (WCTE 2023). - : Curran Associates, Inc.. - 9781713873297 ; , s. 2907-2914
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Konferensbidrag (refereegranskat)abstract
- Wind-induced dynamic excitation is a governing design action determining size and shape of modern Tall Timber Buildings (TTBs). The wind actions generate dynamic loading, causing discomfort or annoyance for occupants due to the perceived horizontal sway, i.e. vibration serviceability problem. Although some TTBs have been instrumented and measured to estimate their key dynamic properties (eigenfrequencies, mode shapes and damping), no systematic evaluation of dynamic performance pertinent to wind loading had been performed for the new and evolving construction technologies used in TTBs. The DynaTTB project, funded by the ForestValue research program, mixed on site measurements on existing buildings excited by mass inertia shakers (forced vibration) and/or the wind loads (ambient vibration), for identification of the structural system, with laboratory identification of building elements mechanical features, coupled with numerical modelling of timber structures. The goal is to identify and quantify the causes of vibration energy dissipation in modern TTBs and provide key elements to finite element models. This paper presents an overview of the results of the project and the proposed Guidelines for design of TTBs in relation to their dynamic properties.
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| 3. |
- Andersson, Jakob, 1974-, et al.
(författare)
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Geomapping Landscapes of Writing (GLoW) : Large-Scale Spatial Analysis of the Cuneiform Corpus (c. 3400 BCE to 100 CE)
- 2021
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The cuneiform record ranks among the largest preserved bodies of historical documentation from the ancient world (Streck 2010). Conveyed on omnipresent and extremely durable types of material, cuneiform texts are preserved in immense, extending over all of the Middle East and a historical period of more than three millennia of early human history. Drawing on recent advances in digital humanities and geospatial data mapping, GLoW aims to survey, analyse, and investigate broader, macrohistorical patterns in the formation and preservation of this unique historical record. As a first quantifiable, comprehensive study of the cuneiform corpus, GLoW will provide a benchmark example of the application of digital and spatial computing tools to the study of writing in early human history. This poster offers an introduction to key research foci and the project research programme, including an introduction to data infrastructure, dissemination, and key collaborators.
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| 4. |
- Blomqvist, Lars, 1962-, et al.
(författare)
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EXPERIMENTAL AND NUMERICAL ANALYSES OF A CONNECTION FOR CLT STRUCTURES
- 2023
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Ingår i: Proceedings of the 2023 World Conference on Timber Engineering (WCTE). - Oslo, Norway : Curran Associates, Inc.. ; , s. 1154-1159
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Konferensbidrag (refereegranskat)abstract
- Although building systems made of cross-laminated timber (CLT) have become common in Sweden in the past 20 years and they have developed rapidly during the same period, steps remain to be taken to simplify the assembly of such systems, especially at construction sites. Current construction methods, however, remain labour-intensive and thus show room for improvement.This paper describes a novel connection for the assembly of building elements made of CLT. Simple and inexpensive, the connection is fairly insensitive to manufacturing tolerances and enables rapid, more efficient construction than the connections for CLT structures currently used. Test results show the excellent strength and stiffness of the connection, which also allows the replacement of numerous fasteners, including nails and screws, with only a single steel rod.
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| 5. |
- Fröberg, Lars, et al.
(författare)
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Vart tog backsmörblommorna vägen?
- 2020
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Ingår i: Botaniska Notiser: utgivna av Lunds botaniska förening (2001-). - 1650-3767. ; 153:1, s. 1-22
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 6. |
- Fukushima, Nanna, 1978-, et al.
(författare)
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Fossilt till bio : Klimatpåverkan av drivmedelsdistribution
- 2023
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Trots att ökad användning av biodrivmedel anses vara viktig för att uppnå klimatmålen i Sverige och EU, råder det idag brist på kunskap om hur produktionen och distributionen av biodrivmedel påverkar de svenska växthusgasutsläppen. Samtidigt har beroendet av importerat bränsle för drivmedelsförsörjningen i Sverige blivit en nationell säkerhetsfråga, vilket kräver ökad kunskap om utvecklingen av framtidens fossilfria transportsystem. Målet med denna förstudie är att utforska och kartlägga produktionen, distributionen och efterfrågan av drivmedel i Sverige idag. Inom ramen för en huvudstudie planerar vi sedan att analysera och studera hur en förändrad drivmedelslogistik, kopplad till användningen och produktionen av biodrivmedel, kan komma att se ut och vilka konsekvenser det får för landets växthusgasutsläpp. En särskild fokus kommer att läggas på att undersöka hur nettoutsläppen påverkas av en ökad självförsörjning av biodrivmedel i Sverige. Ett ytterligare delmål med förstudien har varit att etablera ett starkt konsortium för att erhålla en korrekt nulägesbild och för att fylla eventuella kunskapsluckor. Inför rapporteringen av denna förstudie har vi samarbetat med Energimyndigheten och Drivkraft Sverige, en branschorganisation för drivmedel. Dessutom har vi inlett ett samarbete med Skogforsk, ett skogsforskningsinstitut med gedigen kunskap om användningen av skogliga resurser som råmaterial för biodrivmedelsframställning, vilket är den potentiellt mest betydelsefulla råvaran för storskalig biodrivmedelsproduktion i Sverige. Genom denna förstudie har vi lagt en solid grund för fortsatta analyser där resultaten kommer att bidra till att möjliggöra effektivisering av biodrivmedelsdistributionen och ge rekommendationer för politiska åtgärder som minskar växthusgasutsläppen. Förstudien har genomförts av VTI och partners med finansiering från Triple F.
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| 7. |
- Hansson, Stina, 1988-, et al.
(författare)
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Posterior crossbite corrections in the early mixed dentition with quad helix or rapid maxillary expander : a cost-effectiveness analysis of a randomized controlled trial
- 2024
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Ingår i: European Journal of Orthodontics. - : Oxford University Press. - 0141-5387 .- 1460-2210. ; 46:3
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Unilateral posterior crossbite is a common malocclusion, and early treatment is recommended to enable normal growth. There are several possibilities regarding choice of appliances used for correcting this malocclusion; however, when treatment is financed by public funds the decision needs to be based not only on the effects but also on the effect in relation to the costs. OBJECTIVES: The aim was to perform a cost-effectiveness analysis comparing quad helix (QH) and rapid maxillary expanders (RME; hyrax-type) in children in the early mixed dentition.MATERIAL AND METHODS: Seventy-two patients were randomized to treatment with either QH or RME, at two different centres. Data were collected from the patient's medical records regarding success rate, number of visits, total treatment time, emergency visits, and so forth, together with answers from patient questionnaires concerning absence from school and use of analgesics. A cost-effectiveness analysis with both an intention-to-treat (ITT) and a per-protocol approach was performed, as well as a deterministic sensitivity analysis.RESULTS: The success rate, one year after the completion of the expansion, was equal between groups according to the ITT approach. From a healthcare perspective, the mean cost difference between RME and QH was €32.05 in favour of QH (P = 0.583; NS). From a societal perspective, the mean cost difference was €32.61 in favour of QH (P = 0.742; NS). The total appliance cost alone was higher in the RME group €202.67 resp. €155.58 in the QH group (P = 0.001). The probability of RME having a higher cost was 71% from a healthcare perspective and 62.7% from a societal perspective. The total treatment time was 97 days longer in the QH group. In the deterministic sensitivity analysis, when using a higher valuation of the children's educational loss, the QH becomes €58 more costly than the RME. There was a statistically significant difference in chair time and visits between centres (P < 0.001).CONCLUSION: The difference in costs between RME and QH is not statistically significant, however, there is a slightly higher probability that RME is more expensive than QH with a mean cost of an additional €32 per patient from a healthcare perspective. Different work procedures at different centres indicate that logistics around the patient's treatment is a more important aspect than appliance used to decrease the number of visits and save chair time and thereby also costs.
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| 8. |
- Hansson, Stina, 1988-, et al.
(författare)
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Posterior crossbite corrections in the early mixed dentition with quad helix or rapid maxillary expander: a cost-effectiveness analysis of a randomized controlled trial
- 2024
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Ingår i: EUROPEAN JOURNAL OF ORTHODONTICS. - : Oxford University Press. - 0141-5387 .- 1460-2210. ; 46:3
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Tidskriftsartikel (refereegranskat)abstract
- Background: Unilateral posterior crossbite is a common malocclusion, and early treatment is recommended to enable normal growth. There are several possibilities regarding choice of appliances used for correcting this malocclusion; however, when treatment is financed by public funds the decision needs to be based not only on the effects but also on the effect in relation to the costs. Objectives: The aim was to perform a cost-effectiveness analysis comparing quad helix (QH) and rapid maxillary expanders (RME; hyrax-type) in children in the early mixed dentition. Material and methods: Seventy-two patients were randomized to treatment with either QH or RME, at two different centres. Data were collected from the patient's medical records regarding success rate, number of visits, total treatment time, emergency visits, and so forth, together with answers from patient questionnaires concerning absence from school and use of analgesics. A cost-effectiveness analysis with both an intention-to-treat (ITT) and a per-protocol approach was performed, as well as a deterministic sensitivity analysis. Results: The success rate, one year after the completion of the expansion, was equal between groups according to the ITT approach. From a healthcare perspective, the mean cost difference between RME and QH was 32.05 in favour of QH (P = 0.583; NS). From a societal perspective, the mean cost difference was 32.61 in favour of QH (P = 0.742; NS). The total appliance cost alone was higher in the RME group 202.67 resp. 155.58 in the QH group (P = 0.001). The probability of RME having a higher cost was 71% from a healthcare perspective and 62.7% from a societal perspective. The total treatment time was 97 days longer in the QH group. In the deterministic sensitivity analysis, when using a higher valuation of the children's educational loss, the QH becomes 58 more costly than the RME. There was a statistically significant difference in chair time and visits between centres (P < 0.001). Conclusion: The difference in costs between RME and QH is not statistically significant, however, there is a slightly higher probability that RME is more expensive than QH with a mean cost of an additional 32 per patient from a healthcare perspective. Different work procedures at different centres indicate that logistics around the patient's treatment is a more important aspect than appliance used to decrease the number of visits and save chair time and thereby also costs.
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| 9. |
- Johansson, Carolin, 1981-, et al.
(författare)
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En värld av kilskrift
- 2022
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Ingår i: Medusa. Svensk tidskrift för antiken. - : Tidskriften Medusa. - 0349-456X. ; 43:4, s. 29-34
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 10. |
- Johansson, Carolin, et al.
(författare)
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The location of Umm Chatil : a note on BM 116618
- 2022
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Ingår i: NABU. Nouvelles Assyriologiques Brèves et Utilitaires. - : Société pour l’étude du Proche-Orient ancien (Sépoa). - 0989-5671. ; 1, s. 1-2
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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