| 1. |
- Larsson, Björn, 1966-, et al.
(författare)
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Vägradöda.se
- 2017
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Bok (populärvet., debatt m.m.)abstract
- Forskningsprojektet Vägra Döda-historier om de vapenfria männen är ansvariga utgivare av hemsidan vagradoda.se. Hemsidan är en pågående konstnärspublikation sedan 2017
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| 2. |
- Gulz, Agneta, et al.
(författare)
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Digitalisera de nationella proven
- 2014
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Ingår i: Svenska Dagbladet, Brännpunkt. - 1101-2412.
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- Digitala system för pedagogisk bedömning öppnar nya möjligheter som inte finns med papper och penna. Dessutom frigörs tid för lärarna. Vi ber därför Skolverket att tillsätta en bred arbetsgrupp för att utveckla ett digitalt system för nationella prov, skriver Agneta Gulz och Magnus Haake, båda verksamma inom utbildningsvetenskap.
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| 3. |
- Ringselle, Björn
(författare)
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Resource efficient control of Elymus repens
- 2015
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Elymus repens is a perennial grass weed that causes great yield losses in a variety of crops in the southern and northern temperate zones. Primary control methods for E. repens are herbicides or intensive tillage, both of which have a number of negative side-effects, e.g. herbicides can contaminate groundwater, and tillage can cause increased nitrogen leaching. The aim of this thesis was to investigate how to make non- herbicide control of Elymus repens more resource efficient in terms of less energy demanding soil cultivation and reduced nitrogen leaching. Three field experiments were used to test cover crop competition, mowing and different types of optimised tillage techniques and timing, as well as the combination of under-sown cover crops and mowing or row hoeing. The growth, biomass allocation and morphological responses of E. repens to competition were studied in a greenhouse experiment. The effect of competition from under-sown cover crops on E. repens seems to depend greatly on the cover crop biomass achieved. At high biomass levels, the cover crop can be highly suppressive (Paper IV) and reduce nitrogen leaching (Paper III), while at low levels they can still provide benefits such as reduced E. repens shoot biomass and increased subsequent cereal yield (Paper I). However, a low-yielding red clover cover crop increased E. repens rhizome production by 20-30%. Under-sown cover crops were successfully combined with both mowing and row hoeing (Paper I & III), but while repeated mowing reduced E. repens rhizome production by 35% it could not be shown to give a competitive advantage to the cover crops over E. repens (Paper I). However, the low nitrogen leaching and reduced downward transport of nitrogen when mowing or row hoeing was combined with under-sown cover crops make them interesting control methods for future research. Delaying tine cultivation by a few days after harvest did not reduce E. repens control, but a delay by 20 days tended to result in higher E. repens rhizome biomass and shoot densities, compared to performing it within a few days of harvest. Repeated tine cultivation did not improve control of E. repens or increase subsequent cereal yield, compared to a single cultivation directly after harvest. Repeated cultivation during autumn should therefore not be used categorically, but only when there is reason to believe the shoots will pass the compensation point due to the autumn conditions. We conclude that a site specific approach is necessary to achieve resource efficient control of E. repens.
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| 4. |
- Ötvös, Krisztina, et al.
(författare)
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Pickle recruits retinoblastoma related 1 to control lateral root formation in arabidopsis
- 2021
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Ingår i: International Journal of Molecular Sciences. - : MDPI. - 1661-6596 .- 1422-0067. ; 22:8
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Tidskriftsartikel (refereegranskat)abstract
- Lateral root (LR) formation is an example of a plant post-embryonic organogenesis event. LRs are issued from non-dividing cells entering consecutive steps of formative divisions, proliferation and elongation. The chromatin remodeling protein PICKLE (PKL) negatively regulates auxin-mediated LR formation through a mechanism that is not yet known. Here we show that PKL interacts with RETINOBLASTOMA-RELATED 1 (RBR1) to repress the LATERAL ORGAN BOUNDARIES-DOMAIN 16 (LBD16) promoter activity. Since LBD16 function is required for the formative division of LR founder cells, repression mediated by the PKL–RBR1 complex negatively regulates formative division and LR formation. Inhibition of LR formation by PKL–RBR1 is counteracted by auxin, indicating that, in addition to auxin-mediated transcriptional responses, the fine-tuned process of LR formation is also controlled at the chromatin level in an auxin-signaling dependent manner.
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| 5. |
- Andersson, Edith, et al.
(författare)
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Acute confusional state in elderly orthopaedic patients: factors of importance for detection in nursing care
- 2001
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Ingår i: International Journal of Geriatric Psychiatry. - 1099-1166. ; 16:1, s. 7-17
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVES: The aims of this study were to identify factors of significance in the development of acute confusional state (ACS) and the differences between patients who developed ACS and those who did not. METHOD AND RESULTS: Assessment, observations and interviews with 505 patients admitted to an orthopaedic clinic revealed that 51 patients developed ACS during their in-hospital stay. Patients admitted for hip fracture had a higher incidence of ACS (20.2%) than patients admitted for elective surgery for coxarthros or gonarthros (3.6%). The highest hazard ratio for ACS was several other physical diseases 15.94 (CI: 4.60-55.31 and p-value <0.00001) and the lowest was age 1.10 (CI: 1.04-1.15 and p-value <0.0002). The ACS lasted from 1 to 9 days, and patients had one (N=42), two (N=8) or three episodes (N=1) of confusion during their stay on the ward. More patients who developed ACS before surgery had two or more confusional episodes and emergency patients developed ACS more rapidly. The ACS lasted longer in patients with a higher score on the OBS scale at admittance and with rapid development of ACS. CONCLUSIONS: Acuteness in the situation seems an important risk indication for ACS in the elderly. Awareness of factors associated with the development of ACS makes it possible to more systematically identify those at risk, for instance by systematic assessment in the first interview with the patient on admission to hospital.
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| 6. |
- Brouzoulis, Jim, 1984, et al.
(författare)
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Crack propagation in rails under RCF loading conditions based on material forces
- 2011
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Ingår i: Proceedings of NSCM-24, the 24th Nordic Seminar on Computational Mechanics. - 1799-4896. - 9789526043470 ; , s. 227-229
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- In this paper, numerical simulations of crack growth in rails are presented. More specically, this paper focus on short surface (head-check like) cracks that are often observed at the rail gauge corner. A fatigue propagation law expressed in terms of a crack driving force, derived from the concept of material forces, is presented. This model has been used for parametric studies of crack propagation, investigating key parameters such as loading and crack geometry. The results obtained together with additional investigations suggest that anisotropic effects should be included in order to simulate head-check growth in rails more accurately.
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| 7. |
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| 8. |
- Kristoffersson, Ida, 1980-
(författare)
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Incorporation of Departure Time Choice in a Mesoscopic Transportation Model for Stockholm
- 2009
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Travel demand management policies such as congestion charges encourage car-users to change among other things route, mode and departure time. Departure time may be especially affected by time-varying charges, since car-users can avoid high peak hour charges by travelling earlier or later, so called peak spreading effects. Conventional transport models do not include departure time choice as a response. For evaluation of time-varying congestion charges departure time choice is essential.In this thesis a transport model called SILVESTER is implemented for Stockholm. It includes departure time, mode and route choice. Morning trips, commuting as well as other trips, are modelled and time is discretized into fifteen-minute time periods. This way peak spreading effects can be analysed. The implementation is made around an existing route choice model called CONTRAM, for which a Stockholm network already exists. The CONTRAM network has been in use for a long time in Stockholm and an origin-destination matrix calibrated against local traffic counts and travel times guarantee local credibility. On the demand side, an earlier developed departure time and mode choice model of mixed logit type is used. It was estimated on CONTRAM travel times to be consistent with the route choice model. The behavioural response under time-varying congestion charges was estimated from a hypothetical study conducted in Stockholm.Paper I describes the implementation of SILVESTER. The paper shows model structure, how model run time was reduced and tests of convergence. As regards run time, a 75% cut down was achieved by reducing the number of origin-destination pairs while not changing travel time and distance distributions too much.In Paper II car-users underlying preferred departure times are derived using a method called reverse engineering. This method derives preferred departure times that reproduce as well as possible the observed travel pattern of the base year. Reverse engineering has previously only been used on small example road networks. Paper II shows that application of reverse engineering to a real-life road network is possible and gives reasonable results.
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