| 1. |
- Ahmad, Abdulbaghi, 1951-, et al.
(författare)
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EMDR treatment for children with PTSD : Results of a randomized controlled trial
- 2007
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Ingår i: Nordic Journal of Psychiatry. - : Informa UK Limited. - 0803-9488 .- 1502-4725. ; 61:5, s. 349-354
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Tidskriftsartikel (refereegranskat)abstract
- The objective of the study was to examine the efficacy of EMDR treatment for children with post-traumatic stress disorder ( PTSD) compared with untreated children in a waiting list control group (WLC) participating in a randomized controlled superiority trial (RCT). Thirty-three 6-16-year-old children with a DSM-IV diagnosis of PTSD were randomly assigned to eight weekly EMDR sessions or the WLC group. The Posttraumatic Stress Symptom Scale for Children (PTSS-C scale) was used in interviews with children to evaluate their symptoms and outcome. Post-treatment scores of the EMDR group were significantly lower than the WLC indicating improvement in total PTSS-C scores, PTSD-related symptom scale, and the subscales re-experiencing and avoidance among subjects in the EMDR group, while untreated children improved in PTSD-non-related symptom scale. The improvement in re-experiencing symptoms proved to be the most significant between-group difference over time. The results of the present exploratory study including a limited number of children with PTSD are encouraging and warrant further controlled studies of larger samples of children suffering from PTSD.
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| 2. |
- Johansson Niemelä, Birgitta, et al.
(författare)
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Does Leg Lengthening Pose a Threat to a Child’s Mental Health? : An Interim Report one year after surgery
- 2007
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Ingår i: Journal of Pediatric Orthopaedics. - 0271-6798 .- 1539-2570. ; 27:6, s. 611-617
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Tidskriftsartikel (refereegranskat)abstract
- Previous studies suggest that children react with functional and psychological disturbances after leg lengthening (LL). Long-term effects are not known, and there is a lack of prospective studies. The aim of this interim prospective study was to investigate the psychological impact of the Ilizarov technique on a sample of children 1 year after surgery. Methods: The subjects were 27 patients aged 6 to 16 years treated using the Ilizarov technique at the Pediatric Orthopaedic Department, Uppsala University Hospital, between 1997 and 2005. A control group of healthy children matched for age and sex were also included. Semistructured interviews and psychometric measures (anxiety, depression, self-esteem, behavior) were administered to patients and parents before surgery and 1 year after. Psychological measures were correlated with medical records (days of hospitalization, gained length, etc). The control group was examined at initial assessment only. Results: Before reconstructive surgery, the LL group had a significantly lower self-esteem compared with the control group. Aggressive behavior, attention and externalization problems, anxiety, and depression were significantly reduced after LL. Parents' state anxiety was also reduced. There were no differences in trait anxiety between the parents of patients and the parents of the control children. Conclusions: Patients reported pain, psychological discomfort, complications, and restrained function during LL. However, there were no adverse psychological effects at 1-year follow-up; rather, there were signs of improved mental health. No single psychological parameter could predict the outcome after LL.
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| 3. |
- Mousa, Elsayed, et al.
(författare)
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Reduced Carbon Consumption and CO2 Emission at the Blast Furnace by Use of Briquettes Containing Torrefed Sawdust
- 2019
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Ingår i: Journal of Sustainable Metallurgy. - : Springer. - 2199-3823 .- 2199-3831. ; 5:3, s. 391-401
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Tidskriftsartikel (refereegranskat)abstract
- Lowering the carbon consumption and fossil CO2emissions is a priority in blast furnace (BF) ironmaking. Renewablebiomass is one option that can play an important role in future low-carbon ironmaking particularly in the countries rich inbiomass resources. In this study, full-scale trials to investigate the impact of briquettes containing torrefied sawdust on theBF efficiency and process stability have been conducted. Briquettes containing 1.8% of torrefied pelletized sawdust (TPS),86.2% of steel mill residues, and 12% cement with sufficient mechanical strength have been produced on industrial scale. Thebio-briquettes were charged at two different rates: 37% ( ~ 39 kg/tHM) and 55% ( ~ 64 kg/tHM) bio-briquettes to the SSABBF No. 4 in Oxelösund. The gas utilization was higher during bio-briquette-charging periods without change in pressuredrop up to 55% bio-briquettes, indicating sustained shaft permeability. BF dust generation or properties did not change significantly.Measurements of the top gas composition using mass spectrometry did not indicate release of hydrocarbon fromTPS in connection to the charging of bio-briquettes. Evaluation of process data has been carried out using a heat and massbalance model. The evaluation of operational data in the model indicated lowering of thermal reserve zone temperature by45 °C and reduction in carbon consumption by ~ 10 kg/tHM when charging 55% bio-briquettes compared to the referencecase. The total CO2emission was reduced by about 33–40 kg/tHM when using 55% bio-briquettes.
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| 4. |
- Sundqvist Ökvist, Lena, et al.
(författare)
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Low CO2 ironmaking in the blast furnace : Roheisenerzeugung im Hochofen mit niedrigen CO2 Emissionen
- 2017
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Ingår i: Stahl und Eisen (1881). - : Verlag Stahleisen. - 0340-4803. ; 137:9, s. 29-37
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Tidskriftsartikel (refereegranskat)abstract
- The steel industry contributes to the global emissions of fossil CO2 by ~ 7 %, mainly related to coal and coke used in the BF. At the same time the BF is, and will be in a foreseeable future, the most energy efficient method for ore based hot metal production. Several R&D teams have investigated concepts to minimise CO2 emission as e.g. the ULCOS top gas recycling BF, high injection of H2, use of bio-mass products and HBI. In this paper these different options, and in some cases combination of these are analysed relative the BF conditions and their possible impacts on fossil CO2 emission are compared.
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| 5. |
- Sundqvist Ökvist, Lena, et al.
(författare)
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Low CO2 ironmaking in the blast furnace
- 2017
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Ingår i: Stahl und Eisen (1881). - : Verlag Stahleisen GmbH. - 0340-4803. ; 137:9, s. 29-37
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Tidskriftsartikel (refereegranskat)abstract
- The steel industry contributes to the global emissions of fossil CO2 by around 7 %, mainly related to coal and coke used in the BF. At the same time the BF is, and will be in a foreseeable future, the most energy efficient method for ore based hot metal production. Several R&D teams have investigated concepts to minimize CO2 emission as e. g. the ULCOS top gas recycling BF, high injection of H2, use of bio-mass products and HBI. In this paper these different options, and in some cases combination of these are analyzed relative the BF conditions and their possible impacts on fossil CO2 emission are compared.
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| 6. |
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| 7. |
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| 8. |
- Swartling, Maria, et al.
(författare)
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Experimentally determined temperatures in blast furnace hearth
- 2010
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Ingår i: Ironmaking & steelmaking. - 0301-9233 .- 1743-2812. ; 37:1, s. 21-26
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Tidskriftsartikel (refereegranskat)abstract
- In this study temperature measurements have been carried out at blast furnace no. 2 at SSAB Oxelosund. The temperature was measured in the hearth lining and at the outer surfaces of the hearth wall and bottom. The lining temperature was measured using permanently installed thermocouples and surface temperatures were measured using a hand held thermocouple. The aims of the study were to find a correlation between lining and surface temperatures as well as to find a method to determine the surface temperature based on readings from lining thermocouples. The overall conclusion is that the bottom and wall surface temperatures can be determined based on lining temperatures.
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| 9. |
- Swartling, Maria, et al.
(författare)
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Heat Transfer Modelling of a Blast Furnace Hearth
- 2010
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Ingår i: STEEL RES INT. - : Wiley. - 1611-3683. ; 81:3, s. 186-196
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Tidskriftsartikel (refereegranskat)abstract
- This paper describes the development of a heat transfer model with the purpose of studying the heat flows in the hearth of an operating blast furnace. Temperature profiles were calculated for a period of time to study the transition from steady blast furnace operation to an unsteady period, and back to a steady period. This total time period had the highest lining temperatures registered since the beginning of the current campaign. It was concluded that no part of the lining had an inner temperature higher than the critical temperature of 1150 degrees C. Thus, no refractory could have been in direct contact with slag or iron. The corner between the wall and the bottom was identified to be the most sensitive part of the lining. It is suggested that thermocouples are installed in this area, to improve the temperature control.
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| 10. |
- Swartling, Maria, et al.
(författare)
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Heat Transfer Study of Blast Furnace 2 at SSAB Oxelösund
- 2009
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Ingår i: Journal of Iron and Steel Research International. - 1006-706X .- 2210-3988. ; 16:Part 2 Suppl. 2, s. 1131-1136, s. 1131-1136
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a heat transfer study, based on the actual conditions of the hearth of Blast Furnace 2 at SSAB Oxelosund in Sweden. Initially, an experimental study was carried out. The temperature of the cold surfaces of the bottom and wall lining were measured with a hand-held thermocouple. The aim of the overall study was to find a method to determine the outer surface temperature, based on lining temperature readings from permanently installed thermocouples. A heat transfer model was developed, using the established correlations from the experimental study as boundary conditions. With the model, it is possible to calculate a complete two-dimensional temperature profile of the hearth lining at any given time. The permanently installed thermocouples are used to validate the model, by comparing calculated and measured temperatures; the accuracy of the model is plus/minus 3 degrees difference.
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