| 1. |
- Adediran, Gbotemi, et al.
(författare)
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Micro and nano sized particles in leachates from agricultural soils: Phosphorus and sulfur speciation by X-ray micro-spectroscopy
- 2021
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Ingår i: Water Research. - : Elsevier BV. - 0043-1354 .- 1879-2448. ; 189
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Tidskriftsartikel (refereegranskat)abstract
- Colloids and nanoparticles leached from agricultural land are major carriers of potentially bioavailable nutrients with high mobility in the environment. Despite significant research efforts, accurate knowledge of macronutrients in colloids and nanoparticles is limited. We used multi-elemental synchrotron X-ray fluorescence (XRF) microscopy with multivariate spatial analysis and X-ray atomic absorption near-edge structure (XANES) spectroscopy at the P and S K-edges, to study the speciation of P and S in two fractions of leached particles, >0.45 and <0.45 mu m respectively, collected from four tile-drained agricultural sites in Sweden. P K-edge XANES showed that organic P, followed by P adsorbed to surfaces of aluminum-bearing particles were the most common forms of leached P. Iron-bound P (Fe-P) forms were generally less abundant (0-30 % of the total P). S K-edge XANES showed that S was predominantly organic, and a relatively high abundance of reduced S species suggests that redox conditions were adverse to the persistence of P bound to Fe-bearing colloids in the leachates. Acid ammonium-oxalate extractions suggested that P associated with Al and Fe (Al-P and Fe-P) in most cases could be explained by the adsorption capacity of non-crystalline (oxalate-extractable) oxides of Al and Fe. These results improve our understanding of particulate P and S speciation in the vadose zone and helps in developing effective technologies for mitigating colloidal driven eutrophication of water bodies near agricultural land. (C) 2020 The Author(s). Published by Elsevier Ltd.
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| 2. |
- Almroth, Per, 1975-, et al.
(författare)
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Modeling of the high temperature behaviour of IN792 in gas turbine hot parts
- 2002
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Ingår i: Computational materials science. - 0927-0256 .- 1879-0801. ; 25:3, s. 305-315
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The material parameters for two isothermal viscoplastic models with deliberately limited sets of material parameters have been estimated. The models are to describe the behaviour of the nickel based superalloy IN792 in a gas turbine hot part application. The models are based on a power law flow equation and the state variable used is backstress. The model calibration is done by least-squares optimization using non-standard constitutive tests that are aimed at describing relevant component conditions. The constitutive tests give information about the kinematic hardening effects for the backstress evolution equations, while secondary creep data provides stress versus inelastic strain rate information for the flow equation. All tests are uniaxial and isothermal. With the estimated parameter sets the models give relatively good fits to the data. The results suggest that the models can be used to describe the high temperature behaviour of IN792. ⌐ 2002 Elsevier Science B.V. All rights reserved.
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| 3. |
- Andersson, Håkan, 1970-
(författare)
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A Co-Simulation Approach for Hydraulic Percussion Units
- 2018
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This Licentiate of Engineering thesis concerns modelling and simulation of hydraulic percussion units. These units are often found in equipment for breaking or drilling in rock and concrete, and are also often driven by oil hydraulics, in which complex fluid-structure couplings are essential for their operation.Current methodologies used today when developing hydraulic percussion units are based on decoupled analyses, which are not correctly capturing the important coupled mechanisms. Hence, an efficient method for coupled simulations is of high importance, since these mechanisms are critical for the function of these units. Therefore, a co-simulation approach between a 1D system simulation model representing the fluid system and a structural 3D FE-model is proposed.This approach is presented in detail, implemented for two well-known simulation tools and evaluated for a simple but relevant model. The Hopsan simulation tool was used for the fluid system and the FE-simulation software LS-DYNA was used for the structural mechanics simulation. The co-simulation interface was implemented using the Functional Mock-up Interface-standard.The approach was further developed to also incorporate multiple components for coupled simulations. This was considered necessary when models for the real application are to be developed. The use of two components for co-simulation was successfully evaluated for two models, one using the simple rigid body representation, and a second where linear elastic representations of the structural material were implemented.An experimental validation of the co-simulation approach applied to an existing hydraulic hammer was performed. Experiments on the hydraulic hammer were performed using an in-house test rig, and responses were registered at four different running conditions. The co-simulation model was developed using the same approach as before. The corresponding running conditions were simulated and the responses were successfully validated against the experiments. A parameter study was also performed involving two design parameters with the objective to evaluate the effects of a parameter change.This thesis consists of two parts, where Part I gives an introduction to the application, the simulation method and the implementation, while Part II consists of three papers from this project.
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| 4. |
- Andrist Rangel, Ylva, et al.
(författare)
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Acid-extractable potassium in agricultural soils: Source minerals assessed by differential and quantitative X-ray diffraction
- 2013
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Ingår i: Journal of Plant Nutrition and Soil Science. - : Wiley. - 1436-8730 .- 1522-2624. ; 176, s. 407-419
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Tidskriftsartikel (refereegranskat)abstract
- Different extraction methods are used world-wide in routine soil analysis to estimate long-term potassium (K) reserves for plants. In Sweden, K extracted with 2M HCl at 100 degrees C (KHCl) is frequently used, although with limited understanding of the phases extracted. In the present study, we quantified the effects of this extraction on soil minerals in particle size fractions ranging from clay to sand, and estimated their relative contribution to KHCl. The study included three Swedish long-term agricultural field experiments with texture ranging from loamy sand to silty clay, as well as mineral specimens of K feldspar. Total weight loss of particle size fractions was determined, and quantitative and differential X-ray powder diffraction (QXRD, DXRD), applied on solids before and after extraction, was used to quantify the dissolution of individual mineral phases. QXRD and DXRD included spray-drying of samples, addition of an internal standard and full pattern fitting, where a combination of mineral-standard XRD traces was matched with the experimental one. Our results show that KHCl was primarily associated with clay minerals concentrated in the two finest fractions (220 and < 2 m). Highly expandable and mixed-layer phyllosilicates were quantitatively the most important minerals dissolved. The K was released from micaceous layers in mixed-layer phyllosilicates with a vermiculitic character. Whether di- or trioctahedral, a shared property of the dissolved phases was that they were rich in Fe. In the loamy sand, the coarser fractions (202000m), where feldspars were prominent, accounted for 35% of KHCl. According to DXRD, there was no significant decrease in K feldspars in any of the samples, and KHCl data for the feldspar specimens suggest that clay minerals contributed at least 70% of KHCl also in the loamy sand. Our study provides insights about the soil minerals that contribute to the long-term K delivery capacity of soils and an explanation for the prior observation that KHCl is a dynamic fraction that can be affected by management.
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| 5. |
- Azeez, Ahmed, 1991-
(författare)
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High-Temperature Fatigue in a Steam Turbine Steel : Modelling of Cyclic Deformation and Crack Closure
- 2021
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Existing conventional thermal power plants are retrofitted for flexible operations to assist the transition toward more renewable energies. The deployment of many renewable energy power plants is necessary to achieve a clean environment with less pollution. However, the intermittent nature of renewable energies, due to weather changes, and the lack of efficient large energy storage systems put renewables at a disadvantage. Flexible operations of power plants imply fast and frequent start-ups. Thus, retrofitted power production plants can be utilised as an energy backup to satisfy the immediate demand during peak energy times or when renewable energies are suddenly limited. Large thermal power plants generally employ steam turbines with high inlet temperature and pressure steam conditions. Materials used for components at the high-temperature turbine sections are expected to withstand harsh environments. The use of 9-12 % Cr martensitic steels is desirable due to, among other things, their superior resistance to creep for temperatures up to 625 °C. Retrofitting for flexible operations put steam turbine components under high-temperature fatigue loading conditions different from how they were designed before. The flexible operations could lead to fatigue cracking at critical locations, such as grooves and notches at the inner steam turbine casing. Thus, fatigue behaviour understanding of steam turbine materials under such loading conditions is essential for components life prediction. Accurate and less conservative fatigue life prediction approach is necessary to extend the turbine components life, which reduces waste and provides economic benefits. This can be done by extending operations past crack initiation phase and allowing controlled propagation of cracks in the components. Within the 9-12 % Cr steel class, the martensitic steam turbine steel called FB2 is studied under high-temperature fatigue. This includes investigating high-temperature fatigue life behaviour, cyclic deformation behaviour, stress relaxation behaviour, and crack propagation behaviour along with crack closure behaviour. This was achieved by experimentally testing samples made from FB2 steel under isothermal low cycle fatigue, isothermal fatigue crack propagation, and thermomechanical fatigue crack propagation.
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| 6. |
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| 7. |
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| 8. |
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| 9. |
- Blomquist, Jens, et al.
(författare)
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Structure liming enhances aggregate stability and gives varying crop responses on clayey soils
- 2018
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Ingår i: Acta Agriculturae Scandinavica, Section B - Soil and Plant Science. - : Informa UK Limited. - 0906-4710 .- 1651-1913. ; 68, s. 311-322
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Tidskriftsartikel (refereegranskat)abstract
- It has been suggested that liming can improve soil structure and thereby decrease losses of particles and associated nutrients. In this study, two types of structure lime, slaked lime (Ca(OH)(2)) and a mixed product of calcium carbonate (CaCO3) and slaked lime (Ca(OH)(2)), were applied at three different rates in field trials on clayey soils (23%-40% clay). A combination of primary tillage and structure liming was also studied, in a split-plot trial on a clayey soil (25% clay). Aggregate (2-5mm) stability, measured as reduction in turbidity (which is strongly correlated with losses of particulate phosphorus), was significantly increased with the highest application rates of both structure lime products. Aggregate size distribution was also improved with structure lime, creating a finer tilth in the seedbed. Yield response to structure lime was not consistent, with both negative and positive responses over the four-year study period. Positive yield responses can possibly be attributed to the finer tilth preventing evaporation in two dry growing seasons. Negative yield responses were probably an effect of impaired phosphorus availability associated with limited precipitation in May-July in 2011 and 2013. Two years after liming, soil pH levels were significantly elevated in plots with the highest application rate of structure lime, whereas no significant increases were found three years after liming. However, a lingering effect of liming was still detectable, as manganese concentration in barley grain was significantly lower in plots with the highest application rates of both structure lime products in the fourth study year. These results indicate that structure liming can be used as a measure to mitigate phosphorus losses from clayey soils, thereby preventing eutrophication of nearby waters. However, the yield response was varying and unpredictable and thus further investigations are needed to determine the circumstances in which field liming can act efficiently not only to prevent phosphorus losses, but also to ensure consistent yield increases.
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| 10. |
- Bondelind, Mia, 1980, et al.
(författare)
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Building trust: the importance of democratic legitimacy in the formation of consumer attitudes toward drinking water
- 2019
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Ingår i: Water Policy. - : IWA Publishing. - 1366-7017 .- 1996-9759. ; 21:1, s. 1-18
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Tidskriftsartikel (refereegranskat)abstract
- This study aimed to explore the role of democratic decision legitimacy in the formation of consumer attitudes toward drinking water. Using consumer-level data on the decision to change the drinking water sources in two Swedish cities, three core sets of variables were constructed: (1) the overall democratic decision legitimacy, defined as the citizens' support for the decision; (2) the input, throughput and output dimensions of decision legitimacy, representing the citizens' perceived opportunity to provide input, their ability to oversee, as well as their level of satisfaction with the outcome of the decision-making process; and (3) consumer attitudes toward drinking water, comprising trust, risk perception and acceptance. The results of the study provide support for the proposed mechanism that consumers that perceive a decision-making process more positively also tend to support the ultimate decision more, which in turn helps to establish more positive consumer attitudes towards their drinking water. Consequently, democratic legitimacy is an important precursor for building trust. This is particularly important if a waterborne outbreak has negatively impacted consumers' trust in their water, and when political and engineering decisions must be made.
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| 11. |
- Borgmästars, Emmy, et al.
(författare)
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Comparison of Skimmed Milk and Lanthanum Flocculation for Concentration of Pathogenic Viruses in Water
- 2021
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Ingår i: Food and Environmnetal Virology. - : Springer. - 1867-0334 .- 1867-0342. ; 13:3, s. 380-389
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Tidskriftsartikel (refereegranskat)abstract
- Concentration of viruses in water is necessary for detection and quantification of the viruses present, in order to evaluate microbiological barriers in water treatment plants and detect pathogenic viruses during waterborne outbreaks, but there is currently no standardised procedure. In this study, we implemented a previously described fast and simple lanthanum-based protocol for concentration of norovirus genogroup I (GI), genogroup II (GII) and hepatitis A virus (HAV) in drinking and surface water. We compared the results with those of a widely used skimmed milk flocculation method, followed by nucleic acid extraction and RT-qPCR detection. Three seeding levels, with intended concentrations 5 × 103, 5 × 104 and 5 × 105 genome copies/10 L, were added to drinking water or surface water. All seed levels were detected with both flocculation methods. Samples extracted with skimmed milk flocculation had on average 1.82, 1.86 and 1.38 times higher measured concentration of norovirus GI, GII and HAV, respectively, than those extracted with lanthanum flocculation, across all seeding levels and water types tested. Mengovirus was used as a positive process control. Mengovirus recovery was higher for skimmed milk (40.7% in drinking water, 26.0% in surface water) than for lanthanum flocculation (24.4% in drinking water, 9.7% in surface water). Together, this indicates that skimmed milk flocculation provides higher viral recovery than lanthanum flocculation. However, lanthanum-based flocculation can be performed much faster than skimmed milk flocculation (1.5 h versus 16 h flocculation time) and thus could be a good alternative for rapid monitoring of viruses in water.
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| 12. |
- Borgmästars, Emmy, et al.
(författare)
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Improved Detection of Norovirus and Hepatitis A Virus in Surface Water by Applying Pre-PCR Processing
- 2017
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Ingår i: Food and Environmental Virology. - : Springer Science and Business Media LLC. - 1867-0334 .- 1867-0342. ; 9:4, s. 395-405
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Tidskriftsartikel (refereegranskat)abstract
- Quantitative reverse transcriptase polymerase chain reaction (RT-qPCR) detection of waterborne RNA viruses generally requires concentration of large water volumes due to low virus levels. A common approach is to use dead-end ultrafiltration followed by precipitation with polyethylene glycol. However, this procedure often leads to the co-concentration of PCR inhibitors that impairs the limit of detection and causes false-negative results. Here, we applied the concept of pre-PCR processing to optimize RT-qPCR detection of norovirus genogroup I (GI), genogroup II (GII), and hepatitis A virus (HAV) in challenging water matrices. The RT-qPCR assay was improved by screening for an inhibitor-tolerant master mix and modifying the primers with twisted intercalating nucleic acid molecules. Additionally, a modified protocol based on chaotropic lysis buffer and magnetic silica bead nucleic acid extraction was developed for complex water matrices. A validation of the modified extraction protocol on surface and drinking waters was performed. At least a 26-fold improvement was seen in the most complex surface water studied. The modified protocol resulted in average recoveries of 33, 13, 8, and 4% for mengovirus, norovirus GI, GII, and HAV, respectively. The modified protocol also improved the limit of detection for norovirus GI and HAV. RT-qPCR inhibition with Cq shifts of 1.6, 2.8, and 3.5 for norovirus GI, GII, and HAV, respectively, obtained for the standard nucleic acid extraction were completely eliminated by the modified protocol. The standard nucleic acid extraction method worked well on drinking water with no RT-qPCR inhibition observed and average recoveries of 80, 124, 89, and 32% for mengovirus, norovirus GI, GII, and HAV, respectively.
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| 13. |
- Casetou, Sophie, et al.
(författare)
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Comparison of measured (XRPD) and modeled (A2M) soil mineralogies : A study of some Swedish forest soils in the context of weathering rate predictions
- 2018
-
Ingår i: Geoderma. - : Elsevier BV. - 0016-7061 .- 1872-6259. ; 310, s. 77-88
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Tidskriftsartikel (refereegranskat)abstract
- Quantitative soil mineralogy has been identified as a key factor influencing PROFILE weathering estimates, and is often calculated with normative methods, such as the “Analysis to Mineralogy” (‘A2M’) model. In Sweden and other countries, there is a large request for accurate base cation weathering estimates in order to establish how sustainable harvest of biomass should be performed in the future. However, there is a lack of knowledge around the accuracy of the arithmetic mean output of A2M estimates, the most common A2M solution used in weathering studies. To our knowledge, a thorough investigation of how A2M input data affect the arithmetic mean output (center of gravity of the A2M solution space) is missing. In this study, the indirect geochemical normative method (A2M) was compared with a direct x-ray powder diffraction method (XRPD) to quantify soil mineralogy at two sites and 8 soil profiles, at a 10 cm depth interval. We explored the hypothesis that normative calculations performed with A2M produce an output in closer agreement with the mineralogy obtained from XRPD, if site specific mineralogical input data are used rather than regional data. Site-specific mineralogical input data consisted of mineral stoichiometry data measured by electron microprobe analysis (EMPA) and mineral identity determined by XRPD, whereas regional mineral input data were based on previously reported data on mineral stoichiometry and mineral identity, derived from three geological regions in Sweden. The results from this comparison showed that the site-specific approach yielded relatively low average biases and root mean square errors (RMSE) for most minerals, with the exception of quartz (Average bias of − 4.8 wt%, RMSE of 5.3 wt%) at the Asa site. The regional approach yielded deviating results for K-feldspar and dioctahedral mica, with high average biases and RMSE for dioctahedral mica (Asa: 7.8 wt%, 9.0 wt%; Flakaliden: 12.8 wt%, 15.5 wt%) and for K-feldspar (Asa: − 5.2 wt%, 6.1 wt%; Flakaliden: − 5.6 wt%, 6.7 wt%). The results from this study were supported by a close agreement between measured geochemistry and normalized geochemistry derived from a back calculation of the XRPD mineralogy (i.e. mineral budgeting). In conclusion, our findings suggest that A2M results in combination with site-specific mineralogical input data are improved independent of study site and soil profile. However, for future weathering studies it might be beneficial to find constraints of how to select a solution from the entire A2M solution space which is in better agreement with the XRPD mineralogy.
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| 14. |
- Casetou, Sophie, et al.
(författare)
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Current, steady-state and historical weathering rates of base cations at two forest sites in northern and southern Sweden: a comparison of three methods
- 2020
-
Ingår i: Biogeosciences. - : Copernicus GmbH. - 1726-4170 .- 1726-4189. ; 17, s. 281-304
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Tidskriftsartikel (refereegranskat)abstract
- Reliable and accurate methods for estimating soil mineral weathering rates are required tools in evaluating the sustainability of increased harvesting of forest biomass and assessments of critical loads of acidity. A variety of methods that differ in concept, temporal and spatial scale, and data requirements are available for measuring weathering rates. In this study, causes of discrepancies in weathering rates between methods were analysed and were classified as being either conceptual (inevitable) or random. The release rates of base cations (BCs; Ca, Mg, K, Na) by weathering were estimated in podzolised glacial tills at two experimental forest sites, Asa and Flakaliden, in southern and northern Sweden, respectively. Three different methods were used: (i) historical weathering since deglaciation estimated by the depletion method, using Zr as the assumed inert reference; (ii) steady-state weathering rate estimated with the PROFILE model, based on quantitative analysis of soil mineralogy; and (iii) BC budget at stand scale, using measured deposition, leaching and changes in base cation stocks in biomass and soil over a period of 12 years. In the 050 cm soil horizon historical weathering of BCs was 10.6 and 34.1 mmolc m(-2) yr(-1), at Asa and Flakaliden, respectively. Corresponding values of PROFILE weathering rates were 37.1 and 42.7 mmolc m(-2) yr(-1). The PROFILE results indi- cated that steady-state weathering rate increased with soil depth as a function of exposed mineral surface area, reaching a maximum rate at 80 cm (Asa) and 60 cm (Flakaliden). In contrast, the depletion method indicated that the largest postglacial losses were in upper soil horizons, particularly at Flakaliden.With the exception of Mg and Ca in shallow soil horizons, PROFILE produced higher weathering rates than the depletion method, particularly of K and Na in deeper soil horizons. The lower weathering rates of the depletion method were partly explained by natural and anthropogenic variability in Zr gradients. The base cation budget approach produced significantly higher weathering rates of BCs, 134.6 mmolc m(-2) yr(-1) at Asa and 73.2 mmolc m(-2) yr(-1) at Flakaliden, due to high rates estimated for the nutrient elements Ca, Mg and K, whereas weathering rates were lower and similar to those for the depletion method (6.6 and 2.2 mmolc m(-2) yr(-1) at Asa and Flakaliden). The large discrepancy in weathering rates for Ca, Mg and K between the base cation budget approach and the other methods suggests additional sources for tree uptake in the soil not captured by measurements.
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| 15. |
- Danielsson, Mathias, et al.
(författare)
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The cross-section and branching fractions for dissociative recombination of the diacetylene cation C4D2
- 2008
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Ingår i: International Journal of Mass Spectrometry. - : Elsevier BV. - 1387-3806 .- 1873-2798. ; 273:3, s. 111-116
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Tidskriftsartikel (refereegranskat)abstract
- In this paper we report the results of a study on the dissociative recombination (DR) of the diacetylene cation, C4D2+, which has been carried out at the ion storage ring CRYRING in Stockholm, Sweden. The energy-dependent absolute DR cross-section as well as the branching fractions at 0 eV collision energy were measured. The DR cross-section was best fitted using the expression σ(E) = (7.5 ± 1.5) × 10−16 × E−(1.29±0.03) cm2 over the collision energy range 1–100 meV. The thermal rate coefficient was deduced from the cross-section to be α(T) = (1.10 ± 0.15) × 10−6 × (T/300)−(0.79±0.03) cm3/s. The reported branching fractions for C4D2+ agree with previous experiments on the DR of C4H2+ performed at the ASTRID storage ring in Aarhus, Denmark, and furthermore, indicate that the DR of C4D2+ possesses only two channels leading to the following products: C4D + D (75%) and C2D + C2D (25%).
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| 16. |
- Eriksson, Jan, et al.
(författare)
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Marklära
- 2011
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Bok (övrigt vetenskapligt/konstnärligt)
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| 17. |
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| 18. |
- Falkheimer, Jesper, et al.
(författare)
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Konsten att bygga en institution
- 2020
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Ingår i: 1666. 1999. 2000. 2020. Campus Helsingborg 20 år.. - 9789151970912 ; , s. 229-240
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Bokkapitel (populärvet., debatt m.m.)
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| 19. |
- Fehrman-Ekholm, Ingela, 1947, et al.
(författare)
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Post-nephrectomy development of renal function in living kidney donors: a cross-sectional retrospective study
- 2011
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Ingår i: Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal Association. - : Oxford University Press (OUP). - 1460-2385 .- 0931-0509. ; 26:7, s. 2377-2381
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Increasing numbers of living donor kidney transplantations calls for better knowledge about long-term donor outcomes and risks. METHODS: To explore long-term kidney donor outcomes and risks, we conducted a cross sectional retrospective study. To this end, we analysed renal function using measured glomerular filtration rate (mGFR) and estimated glomerular filtration rate (eGFR) as well as microalbuminuria, blood pressure (BP), body mass index, haemoglobin, albumin and parathyroid hormone in kidney donors nephrectomized between 1965 and 2005. RESULTS: A total number of 573 kidney donors agreed to undergo medical follow-up examinations. The mean age (standard deviation) at donation was 47 (11) years and the mean time since donation was 14 (9) years. Both mean mGFR [68 (15) mL/min/1.73m(2) body surface; P = 0.028] and mean eGFR [71 (16) mL/min/1.73m(2) body surface; P < 0.001], based on modified diet renal dysfunction and iohexol or Cr-EDTA clearance, respectively, were found to decrease with age and to increase with time since donation. Special multivariable regression analyses reveal that for 30-year old donors, the median eGFR typically increases during the first 17 years, then remains constant for ∼8 years and slowly declines thereafter. For 50-year-old donors, the median eGFR is expected to increase during the first 15 years or so and then to enter a phase of slight progressive decline. In total, 23% (126/546) of the donors were on antihypertensive medication. An additional 22% (117/543) of the donors were found to suffer from hitherto undiagnosed hypertension (BP >140/90 mm Hg). CONCLUSION: Renal function of the remaining kidney in living donors is expected to improve for many years but will show signs of slight deterioration in the longer run.
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| 20. |
- Fischer, D., et al.
(författare)
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Importance of Thomas single-electron transfer in fast p-He collisions
- 2010
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Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947 .- 1094-1622. ; 81:1, s. 12714-
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Tidskriftsartikel (refereegranskat)abstract
- We report experimental angular differential cross sections for nonradiative single-electron capture in p-He collisions (p + He -> H + He+) with a separate peak at the 0.47 mrad Thomas scattering angle for energies in the 1.3-12.5 MeV range. We find that the intensity of this peak scales with the projectile velocity as v(P)(-11). This constitutes the first experimental test of the prediction from 1927 by L. H. Thomas [Proc. R. Soc. 114, 561 (1927)]. At our highest energy, the peak at the Thomas angle contributes with 13.5% to the total integrated nonradiative single-electron capture cross section.
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| 21. |
- Fontes, Eduardo, et al.
(författare)
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A heterogeneous model for the MCFC cathode
- 1995
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Ingår i: Electrochimica Acta. - 0013-4686. ; 40:11, s. 1641-1651
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Tidskriftsartikel (refereegranskat)abstract
- A steady state agglomerate model for the MCFC cathode which takes into account the heterogeneous structure of this porous electrode is presented. The resulting model equations are solved by means of the finite element method. Calculations have been performed on two different test structures and include the influence of kinetics, porosity, outer surface area and distribution of electrolyte film. Comparisons with the filmed agglomerate model show that it is possible to obtain excellent agreement between the polarisation curves predicted by the two different models if a uniform film is used in the simulations. The tortuosity in the filmed agglomerate model is used as a fitting parameter. Other effects that evolve in the heterogeneous model due to variations in the local structure are not revealed in the pseudohomogeneous model. The effect of a non-uniform electrolyte film thickness was investigated by solving the problem for a structure with pore mouths filled by an electrolyte meniscus. Also the effect of an electrolyte meniscus between spherical agglomerates was investigated.
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| 22. |
- Fontes, Eduardo, et al.
(författare)
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Effects of different design parameters on the performance of MCFC cathodes
- 1996
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Ingår i: Electrochimica Acta. - 0013-4686. ; 41:1, s. 1-13
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Tidskriftsartikel (refereegranskat)abstract
- The effects of electrode thickness, electrolyte filling and current collector geometry on the performance of MCFC cathodes are investigated by using a steady state mathematical model. A two-dimensional pseudo-homogeneous model for the three-phase system in the cathode is used, which includes the polarisation curves from the heterogeneous agglomerate model[1] as local source functions. The model takes into account the potential distribution in the electrolyte and catalyst phase but neglects mass transport limitations in the gas phase. The simulations show that, for cathodes with a finite electronic conductivity, there is a substantial potential distribution perpendicular to the depth of the electrode depending on the size of the gas holes in the current collector.
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| 23. |
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| 24. |
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| 25. |
- Gammelgård, Magnus, et al.
(författare)
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An IT management assessment framework : Evaluating enterprise architecture scenarios
- 2007
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Ingår i: Information Systems and E-Business Management. - : Springer Science and Business Media LLC. - 1617-9846 .- 1617-9854. ; 5:4, s. 415-435
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Tidskriftsartikel (refereegranskat)abstract
- Enterprise architecture, EA, is an established approach for the model-based and holistic management of IT. The scope of EA is however wide and the predominant EA frameworks suggest the creation of broad and detailed models. IT management cannot control all areas spanned by the present frameworks for EA models. In order to ensure well-informed decisions, IT management has a series of questions that need to be answered. This paper proposes an assessment framework that can be used to identify relevant questions for assessments of EA and EA scenarios, within the areas of EA that IT management can control. Three top dimensions in the proposed framework are presented: IT organization, IT systems, and Business organization. The framework further includes sub dimensions for identifying questions. An application of the assessment framework, as it was applied to assess EA scenarios in a power company, is also described.
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| 26. |
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| 27. |
- Gudmundsson, Magnus, et al.
(författare)
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Two-site double-core-hole states formed when fast protons capture electrons from aligned N2
- 2011
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Ingår i: Journal of Physics B. - : IOP Publishing. - 0953-4075 .- 1361-6455. ; 44:17, s. 175201-
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Tidskriftsartikel (refereegranskat)abstract
- We report on an experimental investigation of 1.04 MeV H++N2 electron transfer collisions. The fast protons were stored in the electron-cooler ion-storage ring, CRYRING and the molecular nitrogen target was provided with a supersonic gas jet. We report momentum distributions of atomic nitrogen dissociation products Nq+ with charge states q+ (q=1, 2, 3) which are detected in coincidence with neutralized projectiles. Further, we investigate the influence of the angle between the direction of the incoming projectile beam and the target molecular axis. The orientation of the latter is determined a posteriorly from the momentum vector of one emitted atomic nitrogen fragment ion. We find signicantly higher total yields, dominated by N+, of charged atomic dissociation products when the N2 molecular axis is perpendicular to the incoming H+-beam. The relative contributions from N2+- and N3+- fragments, however, are strongest when the N2 axis is aligned -or close to aligned- with the ion beam. This, we suggest, is due to increased probabilities for formation of two-site double-core-hole states.
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| 28. |
- Gunnarsson, Fredrik, et al.
(författare)
-
Downtilted Base Station Antennas - A Simulation Model Proposal and Impact on HSPA and LTE Performance
- 2008
-
Ingår i: Proceedings of the 68th IEEE Vehicular Technology Conference. - 9781424417223 - 9781424417216 ; , s. 1-5
-
Konferensbidrag (refereegranskat)abstract
- This paper proposes a low-complexity model for vertical antenna radiation patterns, e.g. for inclusion in system- level simulations. They can be seen as extensions to the horizontal radiation pattern model used in 3GPP simulation scenarios. The model is verified against and compared to predicted and measured data from real networks. The impact on system-level performance is also investigated. It is seen that using the proposed model, simulated geometry distributions and soft handover statistics closely matching those of real networks may be achieved. The analysis also concludes that many real networks have better cell isolation than what is modeled by the 3GPP antenna model. As a consequence, the horizontal radiation pattern model significantly under-estimates the system level performance in such networks. Furthermore, the proposed model is used to assess the LTE and HSPA system-level performance for realistic scenarios.
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| 29. |
- Gustafsson, David, et al.
(författare)
-
Fatigue Crack Growth behaviour of Inconel 718 - the Concept of a Damaged Zone Caused by High Temperature Hold Times
- 2011
-
Ingår i: Procedia Engineering. - : Elsevier. - 1877-7058. ; 10, s. 2821-2826
-
Tidskriftsartikel (refereegranskat)abstract
- Fatigue crack growth testing of Inconel 718 has been carried out at the temperatures 550 °C and 650 °C. The tests were conducted using a mix of hold times and pure cyclic loading, referred to as block tests. From the test results, the existence of an embrittled volume or damaged zone in the vicinity of the crack tip has been revealed. It has been found that the evolution of this damaged zone can be sufficiently well described using a power law function with an exponent n = 0.25.
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| 30. |
- Gustafsson, David, 1983, et al.
(författare)
-
Fatigue crack growth behaviour of Inconel 718 with high temperature hold times
- 2010
-
Ingår i: Procedia Engineering. - : Elsevier BV. - 1877-7058. ; 2:1, s. 1095-1104
-
Konferensbidrag (refereegranskat)abstract
- In this work, fatigue crack growth measurements have been made on center-cracked tension specimens of Inconel 718, where the focus has been to observe the effect of high temperature hold times on the fatigue crack growth behaviour of the material. The material testing has been done at three different temperatures, namely 450 °C, 550 °C and 650 °C. All testing were done in an isothermal LCF context with a standard test method for measuring the fatigue crack growth rates. © 2010 Published by Elsevier Ltd.
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| 31. |
- Gustafsson, David, et al.
(författare)
-
Influence of high temperature hold times on the fatigue crack propagation in Inconel 718
- 2011
-
Ingår i: International Journal of Fatigue. - : Elsevier. - 0142-1123 .- 1879-3452. ; 33:11, s. 1461-1469
-
Tidskriftsartikel (refereegranskat)abstract
- High temperature fatigue crack growth in Inconel 718 has been studied at the temperatures 450 degrees C, 500 degrees C, 550 degrees C and 650 degrees C. The tests were conducted both without hold times and with hold times of different lengths and with a mix of both. Focus has been on quantifying the effect the hold time has upon the crack growth rate and how much it damages the material. Furthermore, it has been investigated how this damage influences the actual cracking behavior, i.e. where in the loading cycle the damage contributes most to the crack growth. This damage is related to the concept of a damaged zone in front of the crack tip. The size of the damaged zone has been derived from the tests and a microscopy study to confirm the findings has also been carried out. It is found that the concept of a damaged zone can be a successful explanatory model for the observed crack growth behavior under high temperature hold time.
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| 32. |
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| 33. |
- Hallström, Jonas, 1969-, et al.
(författare)
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Teknik i fritidshem – mellan omsorg och utbildning
- 2018
-
Ingår i: Teknikdidaktisk forskning för lärare. - Norrköping : NATDID, Nationellt centrum för naturvetenskapernas och teknikens didaktik. - 9789176853269 ; , s. 41-50
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- En stor andel svenska barn mellan sex och nio år gamla går efter skolan till ”fritids”. Fritidshem kännetecknas av både utbildning och omsorg, och därmed av både formella och informella aktiviteter. På senare år har verksamheten blivit mer och mer influerad av skolan och numera finns ett eget kapitel för fritidshem i den nationella läroplanen för grundskolan. Fritidshemmen genomgår därför en förändring som kommer att medföra att mer formella aktiviteter införs, exempelvis inom teknik, samtidigt som praktiskt taget ingen forskning har gjorts på detta. Syftet med det här kapitlet är att presentera några resultat från en pågående forskningsstudie om teknikens roll i aktiviteter på fritidshem. Observationerna fokuserade på de dagliga aktiviteterna på fritidshemmen där teknik hade en central roll. Vi använder begreppet gränsobjekt för att analysera teknik i aktiviteterna. Resultaten visar att det är en speciell sorts teknikundervisning som uppstår i fritidshem, på gränsen mellan den informella och formella verksamheten: från det informella lekrelaterade byggandet med Lego och träklotsar till den mer formella datorundervisningen. I dessa aktiviteter finns ett tydligt fritidsinslag, framför allt i form av ett fritt val av teknik och vad man vill lära sig. Det faktum att barn kan välja fritt pekar inte bara på att teknik i fritidshem är ett gränsobjekt med en stor tolkningsflexibilitet, utan också att teknikundervisning i fritidshem skulle kunna vara en lustfylld och effektiv väg till teknisk allmänbildning.
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| 34. |
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| 35. |
- Hamberg, Mathias, et al.
(författare)
-
Experimental Studies of (HCO+)-C-13 Recombining with Electrons at Energies between 2-50 000 meV
- 2014
-
Ingår i: Journal of Physical Chemistry A. - : American Chemical Society (ACS). - 1089-5639 .- 1520-5215. ; 118:31, s. 6034-6049
-
Tidskriftsartikel (refereegranskat)abstract
- An investigation into the dissociative recombination process for (HCO+)-C-13 using merged ion-electron beam methods has been performed at the heavy ion storage ring CRYRING, Stockholm, Sweden. We have measured the branching fractions of the different product channels at similar to 0 eV collision energy to be the following: CO + H 87 +/- 2%, OH + C 9 +/- 2%, and O + CH 4 +/- 2%. The formation of electronically excited CO in the dominant reaction channel has also been studied, and we report the following tentative branching fractions for the different CO product electronic states: CO(X (1)Sigma(+)) + H, 54 +/- 10%; CO(a (3)Pi) + H, 23 +/- 4%; and CO(a' (3)Sigma(+)) + H, 23 +/- 4%. The absolute cross section between similar to 2-50 000 meV was measured and showed resonance structures between 3 and 15 eV. The cross section was fitted in the energy range relevant to astrophysics, i.e., between 1 and 300 meV, and was found to follow the expression sigma = 1.3 +/- 0.3 X 10(-16) E-1.29 +/- 0.05 cm(2) and the corresponding thermal rate constant was determined to be k(T) = 2.0 +/- 0.4 X 10(-7)(T/300)(-0.79 +/- 0.05) cm(3) s(-1). Radioastronomical observations with the IRAM 30 m telescope of HCO+ toward the Red Rectangle yielded an upper column density limit of 4 X 10(11) cm(-2) of HCO+ at the 1 sigma level in that object, indicating that previous claims that the dissociative recombination of HCO+ plays an important role in the production of excited CO molecules emitting the observed Cameron bands in that object are not supported.
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| 36. |
- Hamberg, Mathias, et al.
(författare)
-
Experimental studies of the dissociative recombination for CD3CDOD+ and CH3CH2OH2
-
Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Aims: Determination of branching fractions, cross sections and thermal rate constants for the dissociative recombination of CD3CDOD+ and CH3CH2OH2+ at the low relative kinetic energies encountered in the interstellar medium. Methods: The experiments were carried out by merging an ion and electron beam at the heavy ion storage ring CRYRING, Stockholm, Sweden. Results: Break-up of the CCO structure into three heavy fragments is not found for either of the ions. Instead the CCO structure is retained in 23 ± 3% of the DR reactions of CD3CDOD+ and 7 ± 3% in the DR of CH3CH2OH2+, whereas rupture into two heavy fragments occurs in 77 ± 3% and 93 ± 3% of the DR events of the respective ions. The measured cross sections were fitted between 1-200 meV yielding the following thermal rate constants and cross-section dependencies on the relative kinetic energy: σ(Ecm[eV]) = 1.7 ± 0.3 × 10−15(Ecm[eV])−1.23±0.02 cm2 and k(T) = 1.9 ± 0.4 × 10−6(T/300)−0.73±0.02 cm3s−1 for CH3CH2OH2+ as well as k(T) = 1.1 ± 0.4 × 10−6(T/300)−0.74±0.05 cm3s−1 and σ(Ecm[eV]) = 9.2 ± 4 × 10−16(Ecm[eV])−1.24±0.05 cm2 for CD3CDOD+.
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| 37. |
- Hamberg, Mathias, et al.
(författare)
-
Experimental studies of the dissociative recombination processes for the dimethyl ether ions CD3OCD2+ and (CD3)2OD
- 2010
-
Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 514, s. A83-
-
Tidskriftsartikel (refereegranskat)abstract
- Aims: Determination of branching fractions, cross sections and thermal rate coefficients for the dissociative recombination of CD3OCD2+ (0-0.3 eV) and (CD3)2OD+ (0-0.2 eV) at the low relative kinetic energies encountered in the interstellar medium. Methods: The measurements were carried out using merged electron and ion beams at the CRYRING storage ring, Stockholm, Sweden. Results: For (CD3)2OD+ we have experimentally determined the branching fraction for ejection of a single hydrogen atom in the DR process to be maximally 7% whereas 49% of the reactions involve the break up of the COC chain into two heavy fragments and 44% ruptures both C-O bonds. The DR of CD3OCD2+ is dominated by fragmentation of the COC chain into two heavy fragments. The measured thermal rate constants and cross sections are k(T) =1.7 ± 0.5 × 10−6(T/300)−0.77±0.01 cm3s−1, σ= 1.2 ± 0.4 × 10−15(Ecm[eV])−1.27 ± 0.01 cm2 and k(T) = 1.7 ± 0.6 × 10−6(T/300)−0.70±0.02 cm3s−1,σ= 1.7 ± 0.6 × 10−15(Ecm[eV])−1.20±0.02 cm2 for CD3OCD2+ and (CD3)2OD+, respectively.
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| 38. |
- Hamberg, Mathias, et al.
(författare)
-
Experimental studies on the dissociative recombination of H13CO+ with electrons at energies between 2 – 50 000 meV
-
Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Determination of dissociative recombination processes of H13CO+ using merged ion-electron beam methods has been performed at the heavy storage ring CRYRING, Stockholm, Sweden. We have measured the branching fractions at ~0 eV as: CO+H 87±2%, OH+C 9±2% and O+CH 4±2%. The channels leading to CO+H have the following branching fractions between the accessible electronic states of CO(X1S+)+H 46±3%, CO(a3Pg)+H 20±1% and CO(a’3S+)+H 34±3% respectively. The reaction cross section was fitted between 1-300 meV and followed the expression σ = 1.2±0.25×10-16 E-1.32±0.02 cm2 and the corresponding thermal rate constant was determined to k(T) = 2.0±0.4×10−7(T/300)−0.82±0.02 cm3s−1. The cross sections between ~2-50 000 meV were investigated showing resonant structures between 3-15 eV.
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| 39. |
- Höglund, Martin, et al.
(författare)
-
Tyrosine kinase inhibitor usage, treatment outcome, and prognostic scores in CML: report from the population-based Swedish CML registry
- 2013
-
Ingår i: Blood. - : American Society of Hematology. - 0006-4971 .- 1528-0020. ; 122:7, s. 1284-1292
-
Tidskriftsartikel (refereegranskat)abstract
- Clinical management guidelines on malignant disorders are generally based on data from clinical trials with selected patient cohorts. In Sweden, more than 95% of all patients diagnosed with chronic myeloid leukemia (CML) are reported to the national CML registry, providing unique possibilities to compile population-based information. This report is based on registry data from 2002 to 2010, when a total of 779 patients (425 men, 354 women; median age, 60 years) were diagnosed with CML (93% chronic, 5% accelerated, and 2% blastic phase) corresponding to an annual incidence of 0.9/100 000. In 2002, approximately half of the patients received a tyrosine kinase inhibitor as initial therapy, a proportion that increased to 94% for younger (andlt;70 years) and 79% for older (andgt;80 years) patients during 2007-2009. With a median follow-up of 61 months, the relative survival at 5 years was close to 1.0 for patients younger than 60 years and 0.9 for those aged 60 to 80 years, but only 0.6 for those older than 80 years. At 12 months, 3% had progressed to accelerated or blastic phase. Sokal, but not European Treatment and Outcome Study, high-risk scores were significantly linked to inferior overall and relative survival. Patients living in university vs nonuniversity catchment areas more often received tyrosine kinase inhibitors up front but showed comparable survival.
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| 40. |
- Höök, Fredrik, 1966, et al.
(författare)
-
Supported lipid bilayers, tethered lipid vesicles, and vesicle fusion investigated using gravimetric, plasmonic, and microscopy techniques
- 2007
-
Ingår i: Biointerphases. - : American Vacuum Society. - 1559-4106 .- 1934-8630. ; 3:2
-
Tidskriftsartikel (refereegranskat)abstract
- This article summarizes our most recent contributions to the rapidly growing field of supported lipid assemblies with emphasis on current studies addressing both fundamental and applied aspects of supported lipid bilayer (SLB) and tethered lipid vesicles (TLVs) to be utilized in sensing applications. The new insights obtained from combining the quartz crystal microbalance with dissipation monitoring technique with surface plasmon resonance are described, and we also present recent studies in which nanoplasmonic sensing has been used in studies of SLBs and TLVs. To gain full control over the spatial arrangement of TLVs in both two and three dimensions, we have developed a method for site-selective and sequence-specific sorting of DNA-tagged vesicles to surfaces modified with complementary DNA. The combination of this method with nanoplasmonic sensing formats is covered as well as the possibility of using DNA-modified vesicles for the detection of unlabeled DNA targets on the single-molecule level. Finally, a new method for membrane fusion induced by hybridization of vesicle-anchored DNA is demonstrated, including new results on content mixing obtained with vesicle populations encapsulating short, complementary DNA strands.
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| 41. |
- Jansson, Magnus, et al.
(författare)
-
Technology Education and Informal Learning : Technology in the Swedish Leisure-Time Centre as Boundary Object
- 2016
-
Ingår i: <em>PATT-32 Proceedings: Technology Education for 21st Century Skills</em>. - Utrecht : University of Applied Sciences. ; , s. 226-233
-
Konferensbidrag (refereegranskat)abstract
- A majority of Swedish children between six and nine years old attend afterschool activities in a leisure-time centre, fritidshem, until their parents finish work for the day. Leisure-time centres are characterised by “educare” activities, that is, both educational and carerelated activities and thus both formal and informal learning settings. The centres are part of the Swedish educational system and activities should be related to the national curriculum for the compulsory school. The centres are right now in an interesting transition which will lead to the introduction of more formal learning activities, for instance, in technology, at the same time as virtually no research has been carried out on technology activities in the centres. The aim of this paper is therefore to study the role of technology in activities in leisure-time centres. The results are drawn from field work conducted in three Swedish leisure-time centres. The observations focused upon the daily activities in the leisure centres, specifically activities where technology play a central part. The data collection was completed with interviews with teachers. We use the concept of boundary object to analyse the technological activities. The findings indicate that there is a special technology education that emerges in the context of the leisuretime center – leisure-time technology education – at the intersection between informal and formal technology learning, which ranges from the informal play-related construction of Lego and wooden blocks to the more formal computer instruction. The amorphousness of leisure-time technology – the fact that children can choose what they want it to be and what to learn –points to it being a boundary object with a very open interpretative flexibility.
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| 42. |
- Jansson, Magnus, 1962-
(författare)
-
Vardagliga teknikaktiviteter i fritidshem : organisation, didaktik och görande
- 2023
-
Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Det övergripande syftet med denna licentiatstudie är att undersöka hur teknik som undervisningsområde kommer till uttryck inom fritidsverksamheter. Syftet inrymmer ett fokus på vad fritidslärarna gör för att organisera undervisning. Studien utgår ifrån följande frågeställningar: hur ser fritidslärarna på undervisning i teknik i fritidshem; och hur organiseras teknik som en del av undervisnings-praktiken i fritidshem? Studien är kvalitativ samt inspirerad av etnografi och Grounded theory. Studiens teoretiska perspektiv är symbolisk interaktionism, samt Mitchams modell för manifestation av teknik från 1994. Studien är en fält-studie på tre olika fritidshem. I studiens bakgrundsbeskrivning påvisas att fritidshem har haft en historia där hantverk och olika estetiska aktiviteter varit vanligt förekommande aktiviteter. Fritidshemmen har också, i och med en tydligare styrning kring lärandet, fått del i läroplanen Lgr11 (reviderad 2016), där tekniken är en framskriven del av undervisningen. Studien handlar därför om hur fritidshemspersonalen reflekterar och förhandlar och definierar för att göra olika teknikaktiviteter. Fritidshemspersonalen gör, enligt studien, här en nyorientering för att tolka innehållet i den egna läroplansdelen. I denna nyorientering använder fritidshemspersonalen sig av tre olika strategier för att hantera detta med teknik som undervisning, detta i ett gränsland mellan tidigare idétraditioner och en utökad styrning.
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| 43. |
- Jonsson, Magnus, et al.
(författare)
-
Computer-supported detection of M-components and evaluation of immunoglobulins after capillary electrophoresis
- 2001
-
Ingår i: Clinical Chemistry. - 0009-9147. ; 47:1, s. 110-117
-
Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Electrophoresis of serum samples allows detection of monoclonal gammopathies indicative of multiple myeloma, Waldenstrom macroglobulinemia, monoclonal gammopathy of undetermined significance, and amyloidosis. Present methods of high-resolution agarose gel electrophoresis (HRAGE) and immunofixation electrophoresis (IFE) are manual and labor-intensive. Capillary zone electrophoresis (CZE) allows rapid automated protein separation and produces digital absorbance data, appropriate as input for a computerized decision support system. METHODS: Using the Beckman Paragon CZE 2000 instrument, we analyzed 711 routine clinical samples, including 95 monoclonal components (MCs) and 9 cases of Bence Jones myeloma, in both the CZE and HRAGE systems. Mathematical algorithms developed for the detection of monoclonal immunoglobulins (MCs) in the gamma- and ss-regions of the electropherogram were tested on the entire material. Additional algorithms evaluating oligoclonality and polyclonal concentrations of immunoglobulins were also tested. RESULTS: CZE electropherograms corresponded well with HRAGE. Only one IgG MC of 1 g/L, visible on HRAGE, was not visible after CZE. Algorithms detected 94 of 95 MCs (98.9%) and 100% of those visible after CZE. Of 607 samples lacking an MC on HRAGE, only 3 were identified by the algorithms (specificity, 99%). Algorithms evaluating total gammaglobulinemia and oligoclonality also identified several cases of Bence Jones myeloma. CONCLUSIONS: The use of capillary electrophoresis provides a modern, rapid, and cost-effective method of analyzing serum proteins. The additional option of computerized decision support, which provides rapid and standardized interpretations, should increase the clinical availability and usefulness of protein analyses in the future.
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| 44. |
- Landgren, Magnus, et al.
(författare)
-
Health before and after adoption from Eastern Europe
- 2006
-
Ingår i: Acta Paediatrica. - : Wiley-Blackwell Publishing Inc.. - 0803-5253 .- 1651-2227. ; 95:6, s. 720-725
-
Tidskriftsartikel (refereegranskat)abstract
- DESIGN: A population-based study of pre-adoption, arrival and post-adoption health.AIM: To report prenatal and postnatal background factors, morbidity, growth and development in adoptees from Eastern Europe.SUBJECTS AND METHODS: All 99 children born in Eastern Europe between 1990 and 1995 and adopted to western Sweden during 1993-1997 were invited to participate in the study. Altogether, 76 (77%) participated. Medical records from the birth countries, from the examination at arrival and from medical reports made during a mean post-adoption period of 5 years were evaluated.RESULTS: Low birth weight (< or = 2500 g) occurred in 48%. Congenital malformations were found in 22%. The biological mothers of 33% of the children had been considered alcoholics, and 16% of the children's mothers had been diagnosed with a psychiatric disability. A high incidence of infectious diseases, neurodevelopment disorders and growth retardation had been noted during the pre-adoption period. Upon arrival in Sweden 75% were diagnosed with a medical condition, most often an infection. After a 5-year post-adoption period, small head circumference was associated with alcohol exposure during pregnancy and 46% had at least one neurodevelopment or behavioural disorder.CONCLUSION: Adverse prenatal and perinatal factors, congenital malformations and post-adoption neurodevelopment disorders were common. Adoptees and adopters have complex needs for health support and information.
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| 45. |
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| 46. |
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| 47. |
- Landström, Anders, et al.
(författare)
-
Measurement-Based Stochastical mmWave Channel Modeling
- 2016
-
Ingår i: 2016 IEEE Globecom Workshops (GC Wkshps). - Piscataway, NJ : IEEE Communications Society. - 9781509024827
-
Konferensbidrag (refereegranskat)abstract
- Emerging mmWave technology will require newchannel models. Compared to the lower frequency bands,mmWaves will be more reflected and absorbed but less diffracted.Hence, placement of individual physical structures in the en-vironment will affect the propagation much more than before,providing a challenge for channel modeling. At the same time,however, an increasing amount of information about the topologyof the physical environment, in particular for buildings, is madeavailable through better measurement equipment and servicesfor obtaining 3D data. We propose a Monte-Carlo approachfor channel modeling where interactions between mmWaves andthe surrounding small-scale environment can be included, givena stochastic representation. This method is not only suitablefor assessment of basic effects such as material reflection andabsorption, but can also in the future be extended to variousadditional effects such as weather, traffic, foliage, etc. Theframework is verified against 15 GHz measurements from anurban environment, demonstrating how major reflection pathscan be replicated by modeling the closest buildings.IndexTerms
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| 48. |
- Lindström, Thomas, 1991-
(författare)
-
Fatigue life prediction of additively manufactured ductile nickel-based superalloys : Constitutive and crack initiation modelling
- 2022
-
Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This dissertation was produced at the Division of Solid Mechanics at Linköping University, and is the final result of a project that included mechanical testing and modelling of an additively manufactured ductile nickel-based superalloy.The main objective of the work presented in this thesis was to investigate and model the cyclic behaviour and the fatigue life behaviour of an additively manufactured ductile nickel-based superalloy, with emphasis on modelling the stabilised material behaviour, by which fatigue life predictions can be based upon. The mechanical and fatigue behaviour of additively manufactured alloys have shown to often depend on how the components are manufactured in the 3D-printing machine, meaning that the material is anisotropic. This anisotropic effect is important to account for when predicting the life of components. Therefore, in this work models to predict the mechanical response and the fatigue life of such components have been established. Monotonic tensile tests, creep tests and cyclic fatigue tests at constant temperatures, as well as anisothermal cyclic tests, have been performed to investigate the mechanical and the fatigue behaviour of the material, where specimens built in different orientations have been used to also study the anisotropic behaviour of the material. With the tests as a basis, a constitutive model has progressively been developed and implemented in a finite element context that accounts for the anisotropic behaviour under both elastic and inelastic deformations. In addition, a fatigue crack initiation life model has been developed for the tested low-cycle fatigue and thermomechanical fatigue conditions, which account for both material anisotropy and temperature effects.
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| 49. |
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| 50. |
- Lindström, Åsa, et al.
(författare)
-
A Reference Model for IT Management Responsibilities
- 2006
-
Ingår i: Proceedings - 2006 10th IEEE International Enterprise Distributed Object Computing Conference Workshops, EDOCW2006. ; , s. nr. 4031286-
-
Konferensbidrag (refereegranskat)abstract
- This reference model for IT management responsibilities covers the most important aspects when modeling, analyzing and evaluating enterprise architecture, EA. The reference model can be employed to support IT management in their quest to make well-informed decisions, e.g. to derive architectural principles in order to obtain a proper scope for EA activities, measure the status of the current EA, follow up changes committed, and evaluate alternative EA scenarios. The model is based on extensive literature studies and has been tested in a series of empirical studies
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