| 1. |
- Ahlin, Kjell, et al.
(författare)
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Comparing Road Profiles with Vehicle Perceived Roughness
- 2004
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Ingår i: International Journal of Vehicle Design. - Geneva, Switzerland : Inderscience Enterprises. - 0143-3369 .- 1741-5314. ; 36:2-3, s. 270-286
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Tidskriftsartikel (refereegranskat)abstract
- Accurate road profiles are useful in vehicle design, such as for simulation of durability and ride quality. Laser/inertial profilometers typically record I mm wide profiles. The question is how well such a profile matches perceived vehicle wheel roughness. The objective here was to create a more representative wheel track longitudinal profile. Simulated and measured wheel vibration was compared on a 6km long road. Simulations were made for several definitions of the profile. Results for single laser sensor profiles showed reasonable likeness to truck perceived roughness. By far the best likeness (14.5% better) was achieved when the profile was based on triangular 25%-50%-25% weighted data from three sensors in the wheel track. Clearly, vehicle engineers can benefit from using multiple laser profile sensors, instead of a single sensor. This will improve test accuracy, thus reducing vehicle design project lead times and costs.
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| 2. |
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| 3. |
- Almqvist, Monica, et al.
(författare)
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Ultrasound field characterisation in air using light diffraction tomography
- 2004
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Ingår i: AMUM 2004: Advanced Metrology for Ultrasound in Medicine 2004. - : IOP Publishing. - 1742-6596 .- 1742-6588. ; 1, s. 150-154
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Konferensbidrag (refereegranskat)abstract
- The aim of this work was to show the applicability of light diffraction tomography on airborne ultrasound. Different air-coupled transducers in the frequency range 40 kHz - 2 MHz were measured to show the method's performance. A calibrated microphone and the pulse-echo method were used to evaluate the results. The absolute measurements agreed within the calibrated microphone's uncertainty range. Pulse waveforms and corresponding FFT-diagrams show the method's higher bandwidth compared to the microphone. Further, the method offers non-perturbing measurements with high spatial resolution, which was especially advantageous for measurements close to the transducer surfaces. The S/N-ratio was larger than or in the same range as that of the two comparing methods.
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| 4. |
- Amundin, Mats, 1947-, et al.
(författare)
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An echolocation visualization and interface system for dolphin research
- 2008
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Ingår i: Journal of the Acoustical Society of America. - : Acoustical Society of America (ASA). - 0001-4966 .- 1520-8524. ; 123:2, s. 1188-1194
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Tidskriftsartikel (refereegranskat)abstract
- The present study describes the development and testing of a tool for dolphin research. This tool was able to visualize the dolphin echolocation signals as well as function as an acoustically operated "touch screen." The system consisted of a matrix of hydrophones attached to a semitransparent screen, which was lowered in front of an underwater acrylic panel in a dolphin pool. When a dolphin aimed its sonar beam at the screen, the hydrophones measured the received sound pressure levels. These hydrophone signals were then transferred to a computer where they were translated into a video image that corresponds to the dynamic sound pressure variations in the sonar beam and the location of the beam axis. There was a continuous projection of the image back onto the hydrophone matrix screen, giving the dolphin an immediate visual feedback to its sonar output. The system offers a whole new experimental methodology in dolphin research and since it is software-based, many different kinds of scientific questions can be addressed. The results were promising and motivate further development of the system and studies of sonar and cognitive abilities of dolphins. © 2008 Acoustical Society of America.
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| 5. |
- Arvidsson, Eva, et al.
(författare)
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Primary care patients' attitudes to priority setting in Sweden
- 2009
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Ingår i: Scandinavian Journal of Primary Health Care. - : Informa UK Limited. - 0281-3432 .- 1502-7724. ; 27:2, s. 123-128
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Tidskriftsartikel (refereegranskat)abstract
- Objective. To analyse attitudes to priority setting among patients in Swedish primary healthcare. Design. A questionnaire was given to patients comprising statements on attitudes towards prioritizing, on the role of politicians and healthcare staff in prioritizing, and on patient satisfaction with the outcome of their contact with primary healthcare (PHC). Settings. Four healthcare centres in Sweden, chosen through purposive sampling. Participants. All the patients in contact with the health centres during a two-week period in 2004 (2517 questionnaires, 72% returned). Main outcomes. Patient attitudes to priority setting and satisfaction with the outcome of their contact. Results. More than 75% of the patients agreed with statements like Public health services should always provide the best possible care, irrespective of cost. Almost three-quarters of the patients wanted healthcare staff rather than politicians to make decisions on priority setting. Younger patients and males were more positive towards priority setting and they also had a more positive view of the role of politicians. Less than 10% of the patients experienced some kind of economic rationing but the majority of these patients were satisfied with their contact with primary care. Conclusions. Primary care patient opinions concerning priority setting are a challenge for both politicians and GPs. The fact that males and younger patients are less negative to prioritizing may pave the way for a future dialogue between politicians and the general public.
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| 6. |
- Arvidsson, Eva, 1959-, et al.
(författare)
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Så resonerar läkare och sjuksköterskor vid prioriteringar av patienter i primärvård
- 2007
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Studier av prioriteringar i primärvården är särskilt intressanta eftersom det är där de allra flesta av oss kommer i kontakt med hälso- och sjukvården. Det är också i primärvården prioriteringar och olika former av ransonering på grund av begränsade resurser är vanliga. De allra flesta av oss förstår och accepterar att vi inte omedelbart kan få träffa en läkare om det inte rör sig om akuta och allvarliga sjukdomstillstånd. Vi finner många gånger ett råd om egenvård som en tillfredställande lösning för tillfället. Hur olika prioriteringar görs ”bakom kulisserna” är dock många gånger oklart för oss. Vi kan ibland t.ex. undra varför vi får betala för vissa vårdtjänster medan andra är gratis. Osäkerhet om på vilka grunder prioriteringar sker gäller inte bara för patienter utan även sjukvårdspersonal. Erfarenheter från flera olika håll i Sverige pekar på att de etiska riktlinjer som utgör kärnan i riksdagens prioriteringsprinciper är svåra att använda i praktiken. Det är därför angeläget att få mer kunskap om hur prioriteringsprinciper och begrepp uppfattas av sjukvårdspersonalen för att utveckla arbetsformer som är begripliga och förenliga med rådande rutiner.Distriktsläkare, mottagningssköterskor och distriktssköterskor vid fyra vårdcentraler som tidigare deltagit i en prioriteringsstudie har inbjudits att diskutera prioriteringar utifrån ett antal frågeställningar. Resultaten från dessa diskussioner visar bland att olika begrepp tolkas på många olika sätt. En framgångsrik implementering av den etiska plattformen kräver antagligen betydligt mer av öppna diskussioner om prioriteringar och principer i det dagliga vårdarbetet.Två allmänläkare Eva Arvidsson från Kalmar och Malin André från Falun har bidragit med den största insatsen i projektet som för övrigt inbegriper Lars Borgquist från Avdelningen för allmänmedicin vid Linköpings universitet och Kjell Lindström från Primärvårdens utvecklingsenhet i Jönköping. Studien har finansierats av Forskningsrådet för sydöstra sjukvårdsregionen (FORSS).Jag vill på projektgruppens vägnar tacka alla medverkande från vårdcentralerna Lindsdal och Borgholm i Kalmar läns landsting, Öxnehaga i Jönköpings läns landsting och Ryds vårdcentral i Landstinget i Östergötland.Linköping 2007-07-24Per Carlsson
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| 7. |
- Azeez, Ahmed, et al.
(författare)
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Low Cycle Fatigue Modelling of Steam Turbine Rotor Steel
- 2019
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Ingår i: 9th International Conference Materials Structure & Micromechanics of Fracture (MSMF9). - : Elsevier. ; , s. 149-154, s. 149-154
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Konferensbidrag (refereegranskat)abstract
- Materials in steam turbine rotors are subjected to cyclic loads at high temperature, causing cracks to initiate and grow. To allow for more flexible operation, accurate fatigue models for life prediction must not be overly conservative. In this study, fully reversed low cycle fatigue tests were performed on a turbine rotor steel called FB2. The tests were done isothermally, within temperature range of room temperature to 600 °C, under strain control with 0.8-1.2 % total strain range. Some tests included hold time to calibrate the short-time creep behaviour of the material. Different fatigue life models were constructed. The life curve in terms of stress amplitude was found unusable at 600 °C, while the life curve in terms of total strain or inelastic strain amplitudes displayed inconsistent behaviour at 500 °C. To construct better life model, the inelastic strain amplitudes were separated into plastic and creep components by modelling the deformation behaviour of the material, including creep. Based on strain range partitioning approach, the fatigue life depends on different damage mechanisms at different strain ranges. This allowed the formulation of life curves based on plasticity or creep domination, which showed creep domination at 600 °C, while at 500 °C, creep only dominates for higher strain range.
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| 8. |
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| 9. |
- Bekassy, Zivile, et al.
(författare)
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Is kidney biopsy necessary in children with idiopathic nephrotic syndrome?
- 2023
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Ingår i: Acta Pædiatrica. - 0803-5253. ; 112:12, s. 2611-2618
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Tidskriftsartikel (refereegranskat)abstract
- AIM: To investigate the need, in the Northern European setting, to perform kidney biopsy in children with steroid-sensitive nephrotic syndrome.METHODS: In this retrospective study 124 individuals aged 1-18 years with idiopathic nephrotic syndrome, followed in the paediatric hospitals in southern Sweden from 1999 to 2018, were included.RESULTS: There was a median follow-up time of 6.5 (0.2-16.8) years. The majority (92%) of children were steroid-sensitive and of them, 60.5% were frequently relapsing or steroid-dependent. Microscopic haematuria was found at onset in 81.1% and hypertension in 8.7%. At least one kidney biopsy was performed in 93 (75%). The most common indication was a steroid-dependent or relapsing course (58.4%). One of 79 steroid-sensitive children had another histological diagnosis than minimal change nephropathy 1.3%, 95% confidence interval (0.002, 0.068). Bleeding occurred after eight biopsies (6.6%). Twenty individuals (30.7%) were transferred to adult units, 18 still on immunosuppression.CONCLUSION: We have in our cohort of unselected children with idiopathic nephrotic syndrome confirmed that a kidney biopsy rarely gives important medical information in steroid-sensitive children without any other complicating factor and that the liberal policy of kidney biopsy in the Nordic countries safely can be changed.
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| 10. |
- Blad, Börje, et al.
(författare)
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Improvements in The Hardware of The Lund Impedance Tomography System
- 1992
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Ingår i: Clinical Physics and Physiological Measurement. - 0143-0815. ; 13, s. 15-17
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Tidskriftsartikel (refereegranskat)abstract
- The objective of this study is to improve the quality of the hardware of the existing Lund impedance tomography system. Improvement in the current generator and different isolation proposals are presented.
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