| 1. |
- Reifarth, R., et al.
(författare)
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Nuclear astrophysics with radioactive ions at FAIR
- 2016
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Ingår i: Journal of Physics: Conference Series. - : IOP Publishing. - 1742-6588 .- 1742-6596. ; 665:1
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Konferensbidrag (refereegranskat)abstract
- The nucleosynthesis of elements beyond iron is dominated by neutron captures in the s and r processes. However, 32 stable, proton-rich isotopes cannot be formed during those processes, because they are shielded from the s-process flow and r-process beta-decay chains. These nuclei are attributed to the p and rp process. For all those processes, current research in nuclear astrophysics addresses the need for more precise reaction data involving radioactive isotopes. Depending on the particular reaction, direct or inverse kinematics, forward or time-reversed direction are investigated to determine or at least to constrain the desired reaction cross sections. The Facility for Antiproton and Ion Research (FAIR) will offer unique, unprecedented opportunities to investigate many of the important reactions. The high yield of radioactive isotopes, even far away from the valley of stability, allows the investigation of isotopes involved in processes as exotic as the r or rp processes.
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| 2. |
- Kirstein, Oliver, et al.
(författare)
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Neutron position sensitive detectors for the ESS
- 2014
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Ingår i: Proceedings of Science. - : Proceedings of Science (PoS). ; Vertex2014, s. 029-029
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Konferensbidrag (refereegranskat)abstract
- The European Spallation Source (ESS) in Lund, Sweden will become the world's leading neutron source for the study of materials. It will be a long pulse source, with an average beam power of 5 MW delivered to the target station. The ESS is in the construction phase, which started in 2013 with the completion of the Technical Design Report (TDR). The instruments are being selected from conceptual proposals submitted by groups from around Europe. These instruments present numerous challenges for detector technology in the absence of the availability of Helium-3, which is the default choice for detectors for instruments built until today and due to the extreme rates expected across the ESS instrument suite. Additionally a new generation of source requires a new generation of detector technologies to fully exploit the opportunities that this source provides. To meet this challenge at a green-field site, the detectors will be sourced from partners across Europe through numerous in-kind arrangements; a process that is somewhat novel for the neutron scattering community. This contribution presents briefly the current status of detectors for the ESS, and outlines the timeline to completion. For a conjectured instrument suite based upon instruments recommended for construction, a recently updated snapshot of the current expected detector requirements is presented. A strategy outline as to how these requirements might be tackled by novel detector developments is shown. In terms of future developments for the neutron community, synergies should be sought with other disciples, as recognized by various recent initiatives in Europe, in the context of the fundamentally multi-disciplinary nature of detectors. This strategy has at its basis the in-kind and collaborative partnerships necessary to be able to produce optimally performant detectors that allow the ESS instruments to be world-leading. This foresees and encourages a high level of collaboration and interdependence at its core, and rather than each group being all-rounders in every technology, the further development of centres of excellence across Europe for particular technologies and niches.
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| 3. |
- Asplund, M., et al.
(författare)
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Therapist-Guided Internet-Delivered Acceptance-Enhanced Behavior Therapy for Skin-Picking Disorder : A Randomized Controlled Trial
- 2024
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Ingår i: Behavior Therapy. - : Elsevier BV. - 0005-7894 .- 1878-1888.
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Tidskriftsartikel (refereegranskat)abstract
- Despite its high prevalence, individuals suffering from skin-picking disorder (SPD) face limited access to treatment due to several factors, including geographical and economic barriers, as well as a shortage of properly trained therapists. Offering Internet-delivered therapy could be a solution to these barriers. This study aimed to evaluate the efficacy of therapist-guided Internet-delivered acceptance-enhanced behavior therapy (iBT) for SPD compared to a wait-list control condition. Participants randomized to the intervention group received 10 weeks of iBT (n = 35), while those in the control group were placed on a wait-list (n = 35). The primary outcome was the Skin Picking Scale—Revised (SPS-R). Mixed-model regression analyses demonstrated a significantly greater improvement in SPD symptoms in the iBT group compared to the control group at posttreatment (between-group difference −5.1 points, F = 9.69, p <.001). The between-group effect size was in the large range, with a bootstrapped d of 1.3 (95% CI [0.92, 1.69]). At posttreatment, 43% of the participants in the iBT group were classified as responders, and 31% were in remission, compared to 0% responders and 3% in remission in the control group. At the 6-month follow-up, the SPD symptoms had increased compared to posttreatment. However, the improvement from pretreatment remained significant. Participants reported a high level of satisfaction and credibility of the treatment, and a perceived good level of working alliance. Compared to wait-list control, iBT is an efficacious treatment for SPD at posttreatment and follow-up, with the potential to substantially increase the availability and access to evidence-based treatment for this disorder. Replication studies, particularly those comparing iBT to an active control, are warranted.
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| 4. |
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| 5. |
- Muhic, Dino, et al.
(författare)
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Influence of temperature on energy efficiency in double disc chip refining
- 2009
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Ingår i: Proceedings - 2009 International Mechanical Pulping Conference, IMPC 2009. ; , s. 344-347
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Konferensbidrag (refereegranskat)abstract
- As part of the investment project at Holmen Paper Braviken, the primary stage refining system of counter-rotating RGP68DD refiners (Metso) has been investigated. It is considered to be one of the most energy efficient refiners when comparing to e.g. tensile index. The aim with this work is to optimize the refining conditions for the RGP68DD in regard to refining temperature. Full-scale trials were made where SEC and temperature were successively increased at the same time. The SEC was mainly controlled with motor load and production rate. Feed- and housing- pressure were used to control temperature. The results show that stable specific energy consumption, and refining conditions regarding temperature, resulted in a pulp with increased quality.
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| 6. |
- Adams, M L, et al.
(författare)
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The relationship between soil solution pH and Al3+ concentrations in a range of South Island (New Zealand) soils
- 2000
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Ingår i: Australian Journal of Soil Research. - 0004-9573 .- 1446-568X. ; 38:1, s. 141-153
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Tidskriftsartikel (refereegranskat)abstract
- Concentrations of Al3+ were calculated in soil solutions from concentrations of the monomeric ‘reactive Al’ species ([Al3+] + [Al(OH)2+] + [Al(OH)2+] + [AlF2+]) obtained using a recently reported flow injection analysis (FIA) chelating resin technique. Soil solution samples came from 7 sites encompassing a range of New Zealand soils (Brown, Gley, Pallic, Podzol, and Recent Soils) and vegetation types (pasture, shrub lands, and indigenous and exotic forest). Previously published data from a further 7 sites, obtained using a rapid (7 s) FIA technique, were transformed to give compatible results. The resultant data (n = 85) covered the pH range 2.7–7.6, and showed a single curvilinear relationship for log [Al3+] v. soil solution pH, regardless of vegetation or soil type. At pH >5.6, the data had a slope of –2.98 and fell between the amorphous Al(OH)3 and gibbsite solubility lines. At pH <5.0, the data had a slope of –0.46; further, the soil solutions were under-saturated with respect to both minerals. These results are interpreted as indicating control of Al solubility by Al(OH)3(s) (at pH >5.6) and soil organic matter (at pH <5.0), respectively. This interpretation is supported by data from a pH-dependent Al–fulvic acid binding curve, for which calculated values of [Al3+] follow the same curvilinear relationship determined from the soil solution samples.
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| 7. |
- Mosallanezhad, Z, et al.
(författare)
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Cross-cultural adaptation, reliability and validity of the Persian version of the modified Falls Efficacy Scale
- 2011
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Ingår i: Disability and Rehabilitation. - : Informa UK Limited. - 0963-8288 .- 1464-5165. ; 33:25-26, s. 2446-2453
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Tidskriftsartikel (refereegranskat)abstract
- Purpose. To translate the Swedish version of the Falls Efficacy Scale (FES), the FES(S), into Persian, and to determine reliability and validity of the scale to be used for Persian speaking elderly people. Method. The 'forward-backward' procedure was applied to translate the FES(S) into Persian. A methodological study was then carried out to determine the psychometric properties of the Persian version of the scale. Eighty-one community-dwelling elderly persons (≥65 years) were included. Results. Both reliability and validity of the Persian FES(S) were found to be acceptable (Cronbach's α = 0.75, interclass correlation coefficients = 0.99, p < 0.001 and standard errors of measurements = 1.82). Low to moderate negative correlations of the total score of the scale with the age of the participants and number of falls in the past year were shown. There were also low to moderate correlations between the Persian FES(S) score and the Mini-Mental State Examination score, duration of walks and physical fitness. The participants who took a daily walk, felt healthy, reported no general tiredness and who had had no fall during the past year rated their self-efficacy higher than did their peers. Conclusions. The present study verified that the Persian FES(S) is a culturally relevant, valid and reliable tool for measuring self-perceived confidence in Iranian older adults.
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| 8. |
- Nilsson, Christer, et al.
(författare)
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Ecological Forecasting and the Urbanization of Stream Ecosystems: Challenges for Economists, Hydrologists, Geomorphologists, and Ecologists
- 2003
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Ingår i: Ecosystems (New York. Print). - : Springer Science and Business Media LLC. - 1432-9840 .- 1435-0629. ; 6:7, s. 659-674
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Tidskriftsartikel (refereegranskat)abstract
- The quantity and quality of freshwater resources are now being seriously threatened, partly as a result of extensive worldwide changes in land use, and scientists are often called upon by policy makers and managers to predict the ecological consequences that these alterations will have for stream ecosystems. The effects of the urbanization of stream ecosystems in the United States over the next 20 years are of particular concern. To address this issue, we present a multidisciplinary research agenda designed to improve our forecasting of the effects of land-use change on stream ecosystems. Currently, there are gaps in both our knowledge and the data that make it difficult to link the disparate models used by economists, hydrologists, geomorphologists, and ecologists. We identify a number of points that practitioners in each discipline were not comfortable compromising on-for example, by assuming an average condition for a given variable. We provide five instructive examples of the limitations to our ability to forecast the fate of stream and riverine ecosystems one drawn from each modeling step: (a) Accurate economic methods to forecast land-use changes over long periods (such as 20 years) are not available, especially not at spatially explicit scales; (b) geographic data are not always available at the appropriate resolution and are not always organized in categories that are hydrologically, ecologically, or economically meaningful; (c) the relationship between low flows and land use is sometimes hard to establish in anthropogenically affected catchments; (d) bed mobility, suspended sediment load, and channel form-all of which are important for ecological communities in streams-are difficult to predict; and (e) species distributions in rivers are not well documented, and the data that do exist are not always publicly available or have not been sampled at accurate scales, making it difficult to model ecological responses to specified levels of environmental change. Meeting these challenges will require both interdisciplinary cooperation and a reviewed commitment to intradisciplinary research in the fields of economics, geography, quantitative spatial analysis, hydrology, geomorphology, and ecology.
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| 9. |
- Nilsson, Per, et al.
(författare)
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Retention and long term accumulation of EOC1 from pulp mill effluents in a Baltic Sea recipient
- 2003
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Ingår i: Water, Air and Soil Pollution. - 0049-6979 .- 1573-2932. ; 143:1-4, s. 225-243
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Tidskriftsartikel (refereegranskat)abstract
- The total inventory and distribution of Extractable Organic Chlorine (EOCl) has been investigated in an estuary exposed to pulp mill effluents for over 50 yr. The estuarine turnover of suspended particulate matter (SPM) and associated pollutants was studied using a model describing important processes for EOCl accumulation. The recipient has a low retention of SPM due to dominating stratified conditions in the water column. The total inventory of EOCl in the sediment is therefore relatively low as compared with the total discharge. It was found that the vertical distribution of EOCl has a close relationship to the extent of chlorine use at the mill. Discharges of SPM from the pulp production process play a major role in establishing the chronology of the sediment. A modernisation of the mill from 1986 to 1991 considerably reduced the discharges of chlorinated substances. In the near future there will be an accumulation of EOCl in the estuary.
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| 10. |
- Pallon, L. K. H., et al.
(författare)
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The impact of MgO nanoparticle interface in ultra-insulating polyethylene nanocomposites for high voltage DC cables
- 2016
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Ingår i: Journal of Materials Chemistry A. - : Royal Society of Chemistry (RSC). - 2050-7488 .- 2050-7496. ; 4:22, s. 8590-8601
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Tidskriftsartikel (refereegranskat)abstract
- Low density polyethylene (LDPE) nanocomposites with a reduced conductivity of two orders of magnitude are reported as a novel insulation material for high voltage distribution of renewable energy. The key to the high insulation capacity was to provide 70 nm hexagonal MgO nanoparticles with relatively tong, preferably 18 units long, hydrocarbon functional silsesquioxane coatings. This rendered the surface of the particles completely hydrophobic and also served as a protective layer against adsorption of polar low molecular weight atmospheric substances (H2O and CO2). The elimination of trace amounts of water, in combination with the provided carbon functionality, dramatically improved the dispersion of MgO nanoparticles. The lowest volume conductivity was ca. 7 x 10(-16) s m(-1) for 3 wt% surface coated nanoparticles. Extensive electron microscopy characterization was further used to relate the measured volume conductivity, acquired under conditions that resemble 800 kV high voltage direct current (HVDC) cables, to the distribution of the nanoparticles in the polymer matrix. The results show that an appropriate surface-modification approach yielded uniformly dispersed MgO nanoparticles up to contents as high as 9 wt%, with maintained 10-100 times reduced volume conductivity. Simulations of the MgO nanoparticles distribution revealed that the required interaction radius of the MgO-phase was 775 nm, setting a lower limit of particle amount to effectively work as electrical insulation promoters. The reduced volume conductivity values and scalable processing chemistry reported allow for the production of the next generation insulation material for HVDC cables.
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