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- Emanuelson, Ingrid, 1955, et al.
(författare)
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Computed tomography and single-photon emission computed tomography as diagnostic tools in acquired brain injury among children and adolescents.
- 1997
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Ingår i: Developmental medicine and child neurology. - 0012-1622. ; 39:8, s. 502-7
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Tidskriftsartikel (refereegranskat)abstract
- Twenty children with acquired brain injuries were investigated with CT and SPECT. The findings were related to the clinical outcome judged at discharge following acute care after the injury and at follow-up 5 years later. The abnormalities that were found were classified for each lobe on a scale ranging from 0 (normal) to 5 (severe abnormality). The patients were divided into two groups showing mild and severe injury. CT and SPECT revealed similar results in the patients with severe injury, but in the group of mildly injured children the number of affected lobes and scores indicated by SPECT were significantly higher than those indicated by CT. SPECT also differentiated more effectively between the two outcome groups. This supports the hypothesis that SPECT could be used as an instrument to objectivise minor sequelae and that SPECT and CT are both useful methods for forecasting outcome.
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| 2. |
- Kifetew, G, et al.
(författare)
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Tangential and radial deformation field measurements on wood during drying
- 1997
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Ingår i: Wood Science and Technology. - 0043-7719 .- 1432-5225. ; 31:1, s. 35-44
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Tidskriftsartikel (refereegranskat)abstract
- In a previous study, the deformation field measurement method on wood during drying was described. This paper discusses the deformation field measurement results during drying to 8.2% moisture content on the radial and tangential surfaces. It also attempts to explain the observations by an approximate expression based onearlywood-latewood interaction theory. The deformation on the radial surface varied between -0.7% and 7.5%. The actual measurements on the radial surfaces support previous work. Deformation measurements on the tangential surfaces were between -0.5% and 9.0%. Although the investigations were carried out on gross wood specimens, the results provide an insight into the extent to which local density variation within the early- and latewood layers may influence the magnitude of surface deformation.
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| 3. |
- Kristjánsdóttir, Ragnhildur, et al.
(författare)
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Disorders of the cerebral white matter in children. The spectrum of lesions.
- 1996
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Ingår i: Neuropediatrics. - : Georg Thieme Verlag KG. - 0174-304X .- 1439-1899. ; 27:6, s. 295-8
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Tidskriftsartikel (refereegranskat)abstract
- The use of magnetic resonance imaging (MRI) has resulted in the detection of an increasing number of children with an apparently leukodystrophic white matter. Laboratory tests and the clinical presentation, however, often do not correspond to any known entity and the course is sometimes not progressively deteriorating. Such children with white-matter changes and no known diagnosis were the subject of this Swedish multicentre study, in which MRI findings and clinical data from 100 children considered to have white-matter abnormalities were assessed during the period 1992-1995. At re-evaluation of MR images by an established "white-matter group" of neuroradiologists, paediatric neurologists, neurologists and neurochemists, the MRI signal of the white matter was considered normal in eleven children and eleven had mainly a grey matter affection. Of the remaining 78 children with white matter abnormalities, a diagnosis was found in 32, but in 46 children no diagnosis could be established. A progressive downhill course characterised 17, probably representing hitherto undefined types of leukodystrophies. Five children had a relapsing-remitting course, and in 11 it was difficult to establish whether the course was progressive or stationary. The disease was non-progressive in 13. This group of non-leukodystrophic white-matter changes obviously represents maldevelopments of myelin formation, thus dys- or hypomyelination rather than demyelination.
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| 4. |
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| 5. |
- Lundberg, J. O. N., et al.
(författare)
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Increased nitric oxide production in collagenous and lymphocytic colitis
- 1997
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Ingår i: European Journal of Clinical Investigation. - : Wiley. - 0014-2972 .- 1365-2362. ; 27:10, s. 869-871
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Tidskriftsartikel (refereegranskat)abstract
- The production of nitric oxide (NO) is increased in active ulcerative colitis and in Crohn's disease. We have studied NO production in collagenous colitis (CC) and lymphocytic colitis (LC), both of which are inflammatory bowel disorders of unknown aetiology. NO levels were measured directly in gas sampled from the colon during colonoscopy. Plasma levels of NO metabolites (nitrate/nitrite) were also measured. Luminal NO levels were more than 100 times higher in patients with CC compared with controls. In addition, plasma levels of nitrate/nitrite were increased in the patients as compared with controls. Measurements of NO directly in the colon or its oxidation products in plasma may be a helpful tool in further understanding the role of NO in the pathophysiology of CC and LC. Moreover, it is tempting to speculate that these measurements could be clinically useful in the diagnosis and therapy monitoring of these two inflammatory bowel diseases.
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| 6. |
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| 7. |
- Sandberg, Dick, 1967-, et al.
(författare)
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The Concept of Value Activation : the PrimWood Method for Improved Properties.
- 1998
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Ingår i: Timber and Wood Composites for the Next Century.
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Konferensbidrag (refereegranskat)abstract
- Value Activation is an integrated R&D programme carried out for the last eight years at the Royal Institute of Technology, Wood Technology and Processing. The name Value Activation refers to the basic understanding ofwood, where at present there are properties that are not fully exploited, but with help of a new sawing pattern could be fully utilized. The basic idea lies at an industrial level producing radially sawn timber with good profitability and with a lesser and mostly a controllable moisture movement. In short it implies an activation of values of timber, that has not been exploited in ordinary industrial production to date. This paper gives one example how the basic ideas in the concept ofValue Activation have been implemented to the industry. A new manufacturing system, the Prim Wood Method, has been proposed in order to improve the utilization of wood. One basic idea within this method is a new sawing pattern called star-sawing, which produces timber with two different shapes, viz., timber with rectangular and triangular cross sections. This method facilitates an efficient production of radially sawn timber with vertical annual rings, and without pith and juvenile wood. The triangles produced in star-sawing are used for producing high quality, knot free panels with vertical annual rings, PrimWood Prism. In this process, the timber is finger-jointed to form knot-free lengths and glued together into a block. This block can then be divided according to thickness into boards with vertical annual rings. In star-sawing, a certain volume of clear pieces will be obtained which are relatively long, i.e. longer than 1 metre. It is not desirable to finger-joint these boards, but instead to manufacture PrimWood Prism without a finger-joint. The first full-scale industrial plants based on the Value Activation concept are now in production in nothern Sweden. At full capacity, the saw mill will produce around 18000 m3 of star-sawn pine a year and shift. The plant for Prim Wood Prism will produce around 5 000 m3 a year and shift. The company is expect to generate two to three times the usual value from each log.
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| 8. |
- Sandberg, Dick, 1967-, et al.
(författare)
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The concept of Value Activation : a better utilization of wood.
- 1997
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- A new manufacturing system has been proposed in order to improve the utilization of wood. This concept, called Value Activation, is focused on the basic understanding of wood, and the fact that there are properties that are not fully exploited in conventional wood manufacturing systems to date. The strategy is to activate these inherent properties by a better understanding of the fundamental behaviour of wood, combined with new applied process technology and the development of the required manufacturing systems. One basic idea within this concept is a new sawing pattern called star-sawing, which produces timber with two different shapes, viz., timber with rectangular and triangular cross sections. This method facilitates an efficient production of radially sawn timber with vertical annual rings, and without pith and juvenile wood. Computer simulations and in-practice tests demonstrate a high volume yield for star-sawn timber of pine and spruce. Results also show that shape distortion and crack formation as a result of any moisture change in this timber are minimized. Indentation resistance is higher and in-plane movement lower in radial than in tangential sections. The overall properties and appearance of radially sawn timber are seriously affected by splay knots and the associated fibre disturbance. These defects are often not acceptable in further processing. Accordingly, tests have been performed to remove such defects in star-sawn timber in order to produce knot-free boards and solid wood panels. In this process, the timber is finger-jointed to form knot-free lengths suitable for e.g. ceilings and floors. In addition, such lengths of the triangular timber may be used as raw material to produce high quality solid wood panels (solid laminated wood products) with vertical annual rings.
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| 9. |
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| 10. |
- Sandberg, Dick, et al.
(författare)
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The Concept of Value Activation - The PrimWood Method for Improved Properties
- 1999
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Ingår i: Proceeding of International Conference on Effective Utilization of Plantation Timber : "timber and wood composites for the next century" : May 21-23, 1999, Chi-Tou, Taiwan, R.O.C.. - Chi-Tou, Taiwan : Forest Products Association of R.O.C..
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Konferensbidrag (refereegranskat)
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