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- Brikell, Isabell, et al.
(författare)
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Relative Immaturity in Childhood and Attention-Deficit/Hyperactivity Disorder Symptoms From Childhood to Early Adulthood : Exploring Genetic and Environmental Overlap Across Development
- 2016
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Ingår i: Journal of the American Academy of Child and Adolescent Psychiatry. - : Elsevier. - 0890-8567 .- 1527-5418. ; 55:10, s. 886-895
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Tidskriftsartikel (refereegranskat)abstract
- Objective: Attention-deficit/hyperactivity disorder (ADHD) has been linked to immaturity relative to peers in childhood, yet it is unclear how such immaturity is associated with ADHD across development. This longitudinal twin study examined the genetic and environmental contributions to the association between parents' perception of their child's immaturity relative to peers (RI) in childhood and ADHD symptoms across development.Method: 1,302 twin pairs from the Swedish Twin Study of Child and Adolescent Development were followed prospectively from childhood to early adulthood. Parent ratings of RI were collected at 8 to 9 years and parent and self-ratings of ADHD symptoms were collected at 8 to 9, 13 to 14, 16 to 17, and 19 to 20 years using the Child Behavior Checklist Attention Problems scale. In addition, ADHD symptoms corresponding to DSM criteria were used for sensitivity analysis. Analyses were conducted using longitudinal structural equation modeling with multiple raters.Results: RI-related etiologic factors, predominantly influenced by genes, explained 10-14% of the variance in ADHD symptoms from 8 to 9 up to 16 to 17 years. The influence of these RI-related factors on ADHD symptoms attenuated to 4% by 19 to 20 years of age. The remaining variance in ADHD symptoms was primarily explained by genetic factors independent of RI, which remained relatively stable across development, explaining 19% to 30% of the variance in ADHD symptoms from 13 to 14 up to 19 to 20 years.Conclusion: The results show that RI is significantly associated with ADHD symptoms, particularly during childhood and adolescence, and that the association is primarily explained by a shared genetic liability. Nevertheless, the magnitude of associations across development was modest, highlighting that RI is merely one aspect contributing to the complex etiology of ADHD symptoms.
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| 5. |
- James, Laura, et al.
(författare)
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Territorial Knowledge Dynamics and Knowledge Anchoring through Localized Networks : The Automotive Sector in Vastra Gotaland
- 2016
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Ingår i: Regional studies. - : Informa UK Limited. - 0034-3404 .- 1360-0591. ; 50:2, s. 233-244
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Tidskriftsartikel (refereegranskat)abstract
- Regional Studies. Innovative firms often engage in knowledge interactions across regional boundaries, which is difficult to account for by territorial innovation models. The territorial knowledge dynamics perspective directs attention to the ways in which firms and other actors combine regional and extra-regional relations. It deals with the spatial aspects of innovation, emphasizing constantly evolving knowledge networks that are not confined to regional boundaries, which implies a new view on regional knowledge anchoring. The paper presents a case of innovation in the automotive sector in the Vastra Gotaland region of Sweden to show how a spatial pattern of knowledge interactions develops over time.
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| 7. |
- Karlsson, Patrik, 1973-, et al.
(författare)
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Influence of tool steel hard phase orientation and shape on galling
- 2014
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Ingår i: Advanced Materials Research. - : Trans Tech Publications. - 1022-6680 .- 1662-8985. ; 966-96, s. 249-258
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Tidskriftsartikel (refereegranskat)abstract
- Conventionally manufactured cold work tool steel is often used in sheet metal forming as die material. Due to the forging process, the as-cast network structure of carbides is broken into elongated particles. Depending on the tool cross-section, the orientation and shape of carbides in the active tool surface is different. In the present research, the influence of tool steel hard phase orientation and shape on galling was investigated. D2 type tool steel was cut in three different orientations and tested in lubricated sliding conditions against AISI 304 austenitic stainless steel. Tests were performed using a Slider-On-Flat-Surface and galling was detected by changes in friction and post-test microscopy. The lubricant was Castrol FST8 using 5 g/m2 sheet material. Results showed a strong correlation between sliding distance to galling and tool steel hard phase orientation and shape at low loads, whereas high load contact resulted in early galling in all cases. Material transfer was observed mainly to the tool steel matrix. The worst performance was observed for specimens cut so that the tool steel hard phase, M7C3 carbides in the D2 steel, were oriented along the sliding direction, which resulted in longer open tool matrix areas contacting the sheet material.
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| 8. |
- Larsson, Anders Olof, et al.
(författare)
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Sampling Liquid Journalism
- 2016
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Ingår i: Sage Handbook of Digital journalism. - London : Sage Publications. - 9781473906532 ; , s. 494-508
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Bokkapitel (refereegranskat)
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| 9. |
- Larsson, Anders Olof, et al.
(författare)
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Sampling liquid journalism
- 2016
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Ingår i: Sage handbook of digital journalism. - London : Sage Publications. - 9781473906532 - 9781473957909 ; , s. 494-508
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Bokkapitel (refereegranskat)abstract
- The move to a variety of online environments has affected the ways in which journalism is produced, distributed, and consumed. Such transformations have had clear effects on journalism research. Specifically, these developments into what is sometimes labeled ‘liquid journalism’ have had repercussions for how scholars are able to access, accumulate, and analyze the online presences of, and traces made by, journalists and those citizens who consume their products.
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| 10. |
- Larsson, Ida, 1978-, et al.
(författare)
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Development of a screening test based on isothermal calorimetry for determination of self-heating potential of biomass pellets
- 2017
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Ingår i: Fire and Materials. - : John Wiley & Sons. - 0308-0501 .- 1099-1018. ; 41:8, s. 940-952
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Tidskriftsartikel (refereegranskat)abstract
- For the risk for spontaneous combustion in storage of biomass pellets to be assessed, it is important to know how prone the fuel is to self-heating. There are traditional methods that are used to determine self-heating characteristics of fuels, eg, basket heating tests. The results from basket heating tests indirectly give the reactivity from a series of tests at high temperatures. This paper presents a sensitive screening test procedure for biomass pellets using isothermal calorimetry for direct measurement of the heat production rate at typical bulk storage temperatures. This method can be used to directly compare the reactivity of different batches of biomass pellets. The results could be used, eg, by storage security managers to gain better knowledge of their fuels propensity for self-heating and thereby for safer storage. A large number of tests have been performed to develop the test procedure presented. Different parameters, such as temperature, type of the test sample (powder/crushed or pellets), mass of test sample, and preheating time, have been varied. Furthermore, gas concentrations in the sample ampoule have been measured before and after some tests to study the oxygen consumption and the formation of CO and CO2. Three different types of pellets with different characteristics were tested to assess the variation in behaviour. Based on these tests, a screening test procedure is presented with a test temperature of 60°C, a sample size of 4 g, a 15-minute preheating period at the test temperature, and 24-hour test duration.
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