| 1. |
- Antti, Marta-Lena, et al.
(författare)
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Synthesis and phase development in the Ct-Al-N system
- 2009
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Ingår i: Mechanical properties and processing of ceramic binary, ternary and composite systems. - Hoboken, NJ : John Wiley & Sons. - 9780470344927 ; , s. 3-12
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Konferensbidrag (refereegranskat)abstract
- The ternary nitride system Cr-Al-N has been investigated by sintering different powder compositions. The powder compositions belong to four groups, AIN- + Cr-powder (5 compositions between 20-90 molar% AlN), Al- + Cr 2N-powder (5 compositions between 15-80 molar% Cr2N), AlN-+ Cr2N-powder (50- and 90 molar% Cr2N) and Al- + Cr-powder. The powders were dry mixed and pressed into pellets by uniaxial pressing followed by cold isostatic pressing (ClP). Sintering took place in a graphite lined reaction bonding furnace under nitrogen atmosphere at three different temperatures, 1350°C, 1500°C and 1800°C and in an alumina tube furnace in order to avoid access to carbon. Holding times were varied, from 2 hours up to 72 hours. The phase development was evaluated by thermal analysis and XRD. CrAlN was formed at 1350°C but decomposed at higher temperatures. Both pure Al and Cr-powder were prone to react with carbon in the graphite furnace. Thermal analysis showed a sublimation of Cr2N at temperatures around 1050°C and nitridation of pure Al-powder between 680-750°C and of pure Cr-powder between 610-1080°C. Samples with pure Al-powder showed a very large expansion due to melting of aluminium in combination with nitridation. AIN was found to be more stable than Cr 2N at higher temperatures and longer holding times. The mixtures of Al-+Cr-powder produced an intermediate Al-Cr-phase.
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| 2. |
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| 3. |
- Asekritova, Irina, et al.
(författare)
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Lizorkin-Freitag Formula for Several Weighted Lp Spaces and Vector-Valued Interpolation
- 2005
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Ingår i: Studia Mathematica. - : Institute of Mathematics, Polish Academy of Sciences. - 0039-3223 .- 1730-6337. ; 170:3, s. 227-239
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Tidskriftsartikel (refereegranskat)abstract
- A complete description of the real interpolation space L=(Lp0(ω0),…,Lpn(ωn))θ⃗ ,q is given. An interesting feature of the result is that the whole measure space (Ω,μ) can be divided into disjoint pieces Ωi (i∈I) such that L is an lq sum of the restrictions of L to Ωi, and L on each Ωi is a result of interpolation of just two weighted Lp spaces. The proof is based on a generalization of some recent results of the first two authors concerning real interpolation of vector-valued spaces.
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| 4. |
- Asker-Árnason, Lena, et al.
(författare)
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The Relationship between Reading Comphehension, Working Memory and Language in Children with Cochlear Implants
- 2007
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Ingår i: Acta Neuropsychologica. - 1730-7503 .- 2084-4298. ; 5:4, s. 163-186
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Tidskriftsartikel (refereegranskat)abstract
- and profound hearing impairment treated by cochlear implants (CI). In this study we explore this relationship in sixteen Swedish children with CI. We found that over 60% of the children with CI performed at the level of their hearing peers in a reading comprehension test. Demographic factors were not predictive of reading comprehension, but a complex working memory task was. Reading percentile was significantly correlated to the working memory test, but no other correlations between reading and cognitive/linguistic factors remained significant after age was factored out. Individual results from a comparison of the two best and the two poorest readers corroborate group results, confirming the important role of working memory for reading as measured by comprehension of words and sentences in this group of children.
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| 5. |
- Bengtsson, Bertil, et al.
(författare)
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Allehanda om skadestånd i avtalsförhållanden
- 2009
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Bok (populärvet., debatt m.m.)abstract
- Allehanda om skadestånd i avtalsförhållanden behandlar ett urval av frågor som bedömts vara av praktiskt intresse. Boken är avsedd att vara en hjälpreda i några av de mångahanda situationer som en stackars jurist kan ställas inför – eller, ännu värre, hamna i.Här behandlas bl.a. kontraktsansvarets särart, skadestånd vid icke lagreglerade tjänster, advokatens ansvar för rådgivning, ansvarsbegränsningar samt försäkringsmöjligheter.Boken innehåller bl.a. en utförlig systematisk rättsfallsförteckning. I denna kan läsaren finna rättsfall sorterade under olika rubriker som ”Preskription och reklamation”, ”Hopp i kontraktskedjan” osv.
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| 6. |
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| 7. |
- Dolva, Anne-Stine, et al.
(författare)
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Functional performance characteristics associated with postponing elementary school entry among children with Down syndrom
- 2007
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Ingår i: American Journal of Occupational Therapy. - : AOTA Press. - 0272-9490 .- 1943-7676. ; 61:4, s. 414-20
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVES: This study investigated the relation between functional performance skills of children with Down syndrome and the age of entry into mainstream elementary education. METHOD: In a cross-sectional study of 70% of the 7-year-old children with Down syndrome in Norway (N = 43), we measured functional performance using the Pediatric Evaluation of Disability Inventory (PEDI). The study was a follow-up of a previous study of the same children at age 5 assessed using the same instrument. Data from both studies were used in the analysis. RESULTS: Forty percent of the sample of children with Down syndrome in Norway had entered elementary school after a 1-year postponement (i.e., at age 7). The functional performance skills of the children, as measured using the PEDI, were significantly lower at both age 5 and age 7 in self-care and social function compared with children with Down syndrome who entered elementary school at the usual time (i.e., at age 6). The main characteristics associated with postponed elementary school entry were found in communication skills and bladder and bowel management. CONCLUSION: A certain level of development and independence seems to be required for a child with Down syndrome to be viewed as ready to enter elementary school, and perceptions of readiness for school may be culturally dependent. In addition to the well-described challenges in language and communication skills, being viewed as ready for school includes having stopped using diapers, a topic not previously mentioned as a factor in postponing elementary school entry for children with Down syndrome. Awareness of culturally influenced performance skills may give direction to parents and professionals in targeting areas in the preschool years that might help promote these children's readiness for school.
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| 8. |
- Ebena, Gustav, et al.
(författare)
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Origin and distribution of low molecular weight organic acids and bacteria in a depth profile of a soil covered tailings impoundment in northern Sweden
- 2007
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Ingår i: Journal of Geochemical Exploration. - : Elsevier BV. - 0375-6742 .- 1879-1689. ; 92:2-3, s. 186-195
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Tidskriftsartikel (refereegranskat)abstract
- The tailings at Kristineberg, northern Sweden, have a very low content of organic carbon, a feature common with many sulfidic tailing impoundments. Three different experiments were set-up to assess the role of carbon dioxide in a depth profile. Firstly, pore gas was collected in vials from ground water pipes at various points in the profile of a dry covered tailings impoundment and analyzed in the laboratory for CO2, O-2, N-2, H-2, and CH4 contents. Secondly, pore water was extracted from tension lysimeters at various depths. This water was analyzed for numbers of bacteria (iron-oxidizing and sulfur-oxidizing, both by MPN), and low molecular weight organic acids. Thirdly, Acidithiobacillus ferrooxidans (Strain DSMZ No 1927) was grown on a mixture of irradiated tailings and sterile water. The amount of organic acids produced was monitored. The largest bacterial count of iron-oxidizing bacteria, 4.7 x 10(5)/g tailings, was at the oxidation front, while the heterotrophic sulfur-oxidizing bacteria were mainly found in the unsaturated, oxidized zone, 2.65 x 10(4)/g tailings. The oxidation front was also the location where the largest amount of organic acids was found in the field study (formate 0.83 mg/l and acetate 0.51 mg/l). The acetic acid found coincides with the highest count of iron-oxidizing bacteria. The intrusion of O-2 and CO2 at the studied location is enough for microbiological activity, although the overall effect on AMD production is not addressed. The results from laboratory incubations indicate that the microbial community produces organic carbon with CO2 as the sole carbon source, up to 1.35 mg/l after 16 weeks measured as TOC. To conclude, we suggest that knowledge of the intrusion of both CO2 and O-2 is vital for a full understanding of the microbial ecology, and thus the weathering processes, in a dry covered tailings impoundment. Hence, the CO, produced in the till cover and entering the tailings ecosystem is crucial to the function of the ecosystem. (c) 2006 Elsevier B.V. All rights reserved.
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| 9. |
- Grip, Carl-Erik, et al.
(författare)
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Exergy as a means for process integration in integrated steel plants and process industries
- 2009
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Ingår i: Stahl und Eisen (1881). - 0340-4803. ; 129:9, s. 2-8
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Tidskriftsartikel (refereegranskat)abstract
- Exergy analysis can be a useful tool for process comparison and improvement in industrial energy systems. Examples from three branches are given: pulp and paper, bio refineries (ethanol) and steel production. The application and development of exergy analysis in an integrated steel plant is shown together with description and explanations on destroyed and lost exergy. Implementation for energy conservation and use as a pedagogic tool is discussed.
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| 10. |
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