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- Agredo Chavez, Angelica Maria, et al.
(author)
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Cracking and Fatigue of Heavy Loaded Prestressed Concrete Bridge in Sweden
- 2022
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In: IABSE Symposium Prague 2022: Challenges for Existing and Oncoming Structures - Report, International Association for Bridge and Structural Engineering. - Zürich : International Association for Bridge and Structural Engineering. ; , s. 792-799
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Conference paper (peer-reviewed)abstract
- A prestressed concrete bridge was built in 1963 with BBRV cables. It has three spans and a total length of 134.8 m. Due to mining activities the bridge was loaded with trucks with a total weight of 90 ton during 2012-2014 and from 2019. Crack development has been monitored manually and from 2020 with strain gauges and LVDTs.Cracks normally vary between 0.1 to 0.3 mm in width and grow in length with time. In November 2020 some of the strain gauges on the concrete showed alarming growth and the bridge was closed for traffic. Additional strain gauges were installed on vertical reinforcement bars and an assessment was carried out of the fatigue capacity of the bridge. It was found that the new strain gauges did not indicate any growth in strain and that the fatigue capacity was sufficient. The bridge could be opened again for traffic after being closed for five weeks. Monitoring drift in the strain gauges and fatigue are discussed.
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| 4. |
- Amouzad Mahdiraji, Saeid, et al.
(author)
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An Optimization Model for the Placement of Mobile Stroke Units
- 2024
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In: Advanced Research in Technologies, Information, Innovation and Sustainability - 3rd International Conference, ARTIIS 2023, Proceedings. - : Springer. - 1865-0929 .- 1865-0937. - 9783031488573 - 9783031488580 ; 1935 CCIS, s. 297-310
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Conference paper (peer-reviewed)abstract
- Mobile Stroke Units (MSUs) are specialized ambulances that can diagnose and treat stroke patients; hence, reducing the time to treatment for stroke patients. Optimal placement of MSUs in a geographic region enables to maximize access to treatment for stroke patients. We contribute a mathematical model to optimally place MSUs in a geographic region. The objective function of the model takes the tradeoff perspective, balancing between the efficiency and equity perspectives for the MSU placement. Solving the optimization problem enables to optimize the placement of MSUs for the chosen tradeoff between the efficiency and equity perspectives. We applied the model to the Blekinge and Kronoberg counties of Sweden to illustrate the applicability of our model. The experimental findings show both the correctness of the suggested model and the benefits of placing MSUs in the considered regions.
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| 7. |
- Fors, Niklas, et al.
(author)
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Generating FMUs for the Feature-Based Language Bloqqi
- 2018
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In: Proceedings of the 2nd Japanese Modelica Conference. - : Linköping University Electronic Press. - 1650-3686. - 9789176852668 ; , s. 245-254
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Conference paper (peer-reviewed)abstract
- In this paper, we describe how we generate Functional Mock-up Units (FMUs) for the automation block language Bloqqi. This allows Bloqqi control programs to be tested with simulations of the physical processes they control. The physical process can be specified in any tool that supports the Functional Mockup-Interface (FMI) standard. For example, we have successfully run Bloqqi programs together with Modelica models exported as FMUs. Bloqqi programs execute at discrete times, and we describe how this is handled in the implementation of the DoStep function, specified in the standard.
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| 8. |
- Jäderlund Hagstedt, Lovisa, et al.
(author)
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Impact of the Covid-19 pandemic on use of Video consultations in a Swedish Primary care setting
- 2022
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In: Proceedings of the 18th Scandinavian Conference on Health Informatics. - : Linköping University Electronic Press. - 9789179293444 ; , s. 212-213
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Conference paper (peer-reviewed)abstract
- The objective is to describe how the uptake of online video consultations was affected by the Covid-19 pandemic, using data from a Swedish primary care setting. There seem to be a relationship between the use of video consultations and spread of Covid-19, especially in 2020 when the use varied more with the contagion waves. In 2021 the use was more consistent over time. In summary, the Covid-19 pandemic had a direct impact on the adoption of video consultations in our primary care setting, yet after the initial high use, it appears to have stabilized on a lower level.
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| 9. |
- Khan, Imran, 1978-, et al.
(author)
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MRI scanner vibration path analysis
- 2013
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In: 20th International Congress on Sound and Vibration 2013 (ICSV 20). - : Curran Associates, Inc.. - 9781629931500 ; , s. 3560-3567
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Conference paper (other academic/artistic)abstract
- Magnetic Resonance Imaging (MRI) scanner is one of the most important tools in clinical diagnostics. MRI scanners are associated by strong vibration which results in unpleasant and disturbing acoustic noise. The primary source of this vibration is the Lorentz force produced by fast switching of the currents inside the gradient coils of MRI scanners under a strong static magnetic field. During an MR-imaging scan the switching is controlled in order to spatially code the hydrogen nuclei that will generate the signal, which is reconstructed into anatomical images. Faster switching of the currents allows for shorter scan times and/or higher image resolutions. Consequently, the clinical quality has motivated the drive for shorter switching time and higher currents. This development, however, has also caused an undesired increase of MRI vibrations. The overall vibration phenomenon of an installed fully functional MRI scanner system becomes unique because of the installed location and ambiance. This vibration can potentially degrade the image quality and hence the diagnosis. Apart from the vibration produced, the associated annoying acoustic noise may not only affect the patients under examination and the clinical staff, but may also be transmitted to other parts of the building and causing discomfort for the personnel working there. In order to devise an effective isolation plan or improve an existing one both for vibration and acoustic noise it is important to study the noise and vibration transfer paths. This paper concerns an investigation of vibration transfer paths for vibration excited by an installed functional MRI scanner at a medical facility. The vibration transfer paths have been investigated experimentally. The obtained results are presented and discussed.
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| 10. |
- Kivi, Marie, et al.
(author)
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Internet therapy for Depression in Primary Care – a Randomized Controlled Trial
- 2013
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In: 13th European Congress of Psychology.
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Conference paper (other academic/artistic)abstract
- This study aims to investigate whether Cognitive Behavior Internet therapy (iCBT) for depression is as effective as usual treatment in primary care (PC) settings. Previous research shows good efficacy for iCBT for depression. It might also be a way to cost-efficiently offer evidence based psychological treatment to more patients, given the substantial shortage of trained CBT-therapists in PC. So far, few studies are conducted with a focus on the effectiveness in PC-settings. We identified patients with mild to moderate depression at PC Centers in the Västra Götaland region. They were randomly assigned to either Internet therapy (iCBT) or to treatment as usual (TAU). Before inclusion a structured interview was performed by a psychologist/¬psychotherapist. At present, 75 patients are included. The iCBT encompasses a 12-week access to a Behavioral Activation treatment program on the internet, a workbook, support by the evaluating psychologist/psychotherapist via 3 telephone calls (week 1, 4-5 and 8-12), and weekly contact via secure e-mail. More intense telephone and e mail contacts are available when needed. The main outcome is measured by BDI-II. Preliminary findings show that iCBT is at least as effective as TAU also in PC-settings. Data from the 3- and 6-month follow-ups will be available in June 2013.
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