| 44841. |
- Sundkvist, Petter
(creator_code:msd_t, creator_code:cre_t)
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Winter Fragments : Blow, blow, thou winter wind Thou art not so unkind, As man's ingratitude
- 2011
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Konstnärligt arbete (refereegranskat)abstract
- Concert with Norrbotten NEO - Winter Fragments at Nordlys festivalNorway, TromsöMy participation was Artistic Director and Conductor.The program was built around Vivaldi's famous Violin Concerto with pieces artistically and spiritually connected to the Winter season. Tristan Murail (f.1947) Winter Fragments (2000) 13´Jesper Nordin (f.1971)Surfaces scintillantes (2008) 10´A Vivaldi/NNEO (1678-1741)The Winter 8´Henrik Strindberg (f.1954)Cut Sections, Time Freezes (2005) 7´Anders Hultqvist (f.1955)Light Winter Light (2007) 9´ commissioned by NNEO
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| 44842. |
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| 44843. |
- Sundkvist, Ylva, et al.
(författare)
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Leading from intermediary positions : First-line administrators' experiences of their occupational role and situation
- 2003
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Ingår i: Scandinavian Journal of Occupational Therapy. - : Informa UK Limited. - 1103-8128 .- 1651-2014. ; 10:1, s. 40-46
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to illuminate how first-line administrators in healthcare organizations perceive their occupational role and situation. Interviews were conducted with eight first-line administrators in healthcare environments (five women and three men). Five were registered nurses, one was an occupational therapist, one a physiotherapist and one had a degree in logopaedics. A semi-structured formula with broad open-ended questions was used for the personal interviews. A qualitative interpretive method was used in the analysis. The analysis resulted in three categories describing the perceived role and situation of being a first-line administrator, namely, "developing strategies to manage the leadership role", "being part of an organizational culture characterized by traditional values", and "treading a fine line and striving to manage the balancing act". The results from this study indicate that there is a need to support this group of leaders with training adjusted to the role and situation of leading from intermediary positions in organizations.
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| 44844. |
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| 44845. |
- Sundqvist, Bror, et al.
(författare)
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Cellulose degradation during hydrothermal treatment of birch wood (Betula pubescens Ehrh.)
- 2006
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Ingår i: Cellulose Chemistry and Technology. - 0576-9787. ; 40:3-4, s. 217-221
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Tidskriftsartikel (refereegranskat)abstract
- Study of cellulose degradation during wood's heat treatment showed a considerable degradation in both commercially and laboratory heat-treated wood samples, probably due to the low pH induced by the heat treatment. Experimental series were performed for investigating cellulose degradation in birch wood, at different pH levels and times, during heat treatments performed at pH values of 4, 7 and 10, for 3 and 6 hours at 180°C. The results show that the selected span of pH and time of treatment clearly affects the size of the cellulose molecules. Study of cellulose degradation involved intrinsic viscosity measurements on α-cellulose from the samples. As a result of heat treatment, viscosity drops from 1430 mL/g (untreated wood) to less than or equal 700 mL/g and less than or equal 350 mL/g, for durations of 3 and 6 hours, respectively. The wood buffered in an aqueous solution at pH 4 showed a drop in intrinsic viscosity around 880 mL/g, while a sample of commercial "thermowood" yielded an intrinsic viscosity of 732 mL/g. For neutral and alkaline pH values, the drop in viscosity is considerably lower. At pH values of 7 and 10, a 3 hr treatment had almost no effect on the degree of polymerisation, while a 6 hr treatment gave intrinsic viscosities around 1000 mL/g and 1216 mL/g, respectively. There is a distinct relation between cellulose's molecular size and wood's strength properties. The decrease in cellulose length in unbuffered systems may affect the strength properties of the treated wood. The experiments show that pH is an important factor to consider.
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| 44846. |
- Sundqvist, Bror
(författare)
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Color response of Scots pine (Pinus sylvestris), Norway spruce (Picea abies) and birch (Betula pubescens) subjected to heat treatment in capillary phase
- 2002
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Ingår i: European Journal of Wood and Wood Products. - : Springer Science and Business Media LLC. - 0018-3768 .- 1436-736X. ; 60:2, s. 106-114
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Tidskriftsartikel (refereegranskat)abstract
- Clearwood of Scots pine, Norway spruce, and birch was subjected to heat treatment while capillary water was kept in the wood. The treatments were performed on initially green wood from 65 °C to 95 °C from 0 to 6 days, followed by drying at 35 °C for 2 days. Color measurements, CIEL*C*h color space, were made on dry planed samples using a photoelectric colorimeter. Treatment time was more important than temperature for birch sapwood regarding the color responses, while time and temperature were of similar importance for pine and spruce. Birch sapwood became much redder and darker compared with pine and spruce. The darkening accelerated generally when treatment temperature exceeded approximately 80 °C. Pine and spruce showed generally similar color responses, untreated and treated, except for pine heartwood untreated, which showed a more saturated color. Pine treated at 65 °C and 80 °C showed red-yellow shift and yellow-red shift for sap- and heartwood respectively, as time elapsed. The color homogeneity was less for birch sapwood than for pine and spruce, and the homogeneity was generally indicated to decrease with increasing treatment temperature.
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| 44847. |
- Sundqvist, Bror
(författare)
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Colour changes and acid formation in wood during heating
- 2004
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Heating wood has since ancient times been a method to dry and modify its properties. Nowadays heat is used in industrial processes for the same reasons. Treatment at temperatures above 150ºC can change the colour, improve resistance to biodegradation and enhance dimensional stability. However, losses in the mechanical strength of wood may also occur, and this drawback is a limitation for the use of heat-treated wood in a broad range of products. This thesis suggests that cellulose degradation can contribute to the loss of mechanical strength in wood under high-temperature treatment. The formation of formic and acetic acid during heat treatment of birch wood has been studied. Substantial amounts of acetic acid (at most 7.2% by weight) and formic acid (at most 1.1% by weight) were found in autoclave experiments at temperatures between 160ºC and 200ºC. It was also found that the average molecular size of both commercially heat-treated birch wood and birch wood treated in laboratory experiments under acidic pH conditions was considerably reduced (42%–53%) in comparison to untreated birch wood. It is reasonable to think that the formation of acid and the accompanying decrease in average cellulose molecular size have a crucial influence on the observed decrease of mechanical strength in heat-treated wood. The thesis suggests that wood can be heat-treated while maintaining mechanical strength through a process design that keeps the wood in neutral to alkaline conditions. This thesis also describes studies of colour development in birch, Norway spruce and Scots pine wood during hydrothermal treatment, with special reference to treatment at temperatures between 65ºC and 95ºC with high moisture content. The colour responses of wood that had been heat treated or kiln dried have been investigated, and the colour coordinates Lightness (L*), Chroma (Cab*), hue (h) and colour difference DEab* are presented. It is shown that colour changes associated with heat treatment at high temperatures can be obtained by treatment for long periods at temperatures around 100ºC. Such treatments will lead to changes in colour, but presumably no change in dimensional stability or resistance to biodegradation. The origin of colour formation in wood as a result of heating is briefly investigated and discussed. Colour stability during accelerated UV/Visible light exposure of heat-treated samples has been tested and the results are presented in this thesis. The colour responses of birch, Norway spruce and Scots pine wood were measured after drying in laboratory kiln experiments in the interval of 40º– 111ºC, and it was concluded that the average wood colour of a batch can be controlled by regulating time and temperature. There are some results that show an increase (around 20%) in the mechanical strength of birch wood for heat treatment around 180º–200ºC for approximately 1 hour and that colour measurements may be used as a way to monitor and control the phenomenon. However, further experiments will have to be made to confirm these indications.
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| 44848. |
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| 44849. |
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| 44850. |
- Sundqvist, Bror, et al.
(författare)
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Cross-laminated wood panels in a patient room and studies of interior environment
- 2023
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Ingår i: World conference on timber engineering 2023 (WCTE 2023). - : World Conference on Timber Engineering (WCTE). - 9781713873273 - 9781713873297 ; , s. 1062-1066
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Konferensbidrag (refereegranskat)abstract
- Studies on the effect from biobased materials and products on humans have indicated positive effects. This has earlier been shown in studies for e.g. hospitals, where indications of lower stress and pain in patients with wood as part ofinterior solutions. This paper describes the first step of a larger study that investigates the interior environment and the response of patients. The study presented here measured RH, temperature, emissions of volatile organic compounds (VOC) and microbial activities in two rooms at a hospital in Skellefteá, Orthopaedic ward. One room had a cross-laminated wood panel covering 42% ofwalls, window reveal and doors, and the other a control room with standard coverings. Results indicated only a small difference between the rooms in terms of temperature and RH. VOC emissions varied in both rooms but all concentrations were lower or much lower than threshold values for interior air quality standard limits. Biological contamination ofthe surfaces and from air sampling was also performed. Conclusions of this experimental study shows that from a regulatory perspective it is possible and safe to use wood as interior product.
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