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Sökning: LAR1:lu > Mittuniversitetet > Tidskriftsartikel

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61.
  • Hidestål, Olle, et al. (författare)
  • A chiral biselectrophile for efficient asymmetric synthesis in water
  • 2005
  • Ingår i: Green Chemistry. - : Royal Society of Chemistry (RSC). - 1463-9270 .- 1463-9262. ; 7:5, s. 259-261
  • Tidskriftsartikel (refereegranskat)abstract
    • The development of an efficient asymmetric dihydroxylation of 1,6-dibromodiene afforded a chiral biselectrophilic diol that displayed highly useful reactivity in water, as demonstrated by a three-step, two-pot asymmetric synthesis of a highly functionalized tetrahydrofuran.
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62.
  • Hildingsson, Ingegerd, et al. (författare)
  • The role of women’s emotional profiles in birth outcome and birth experience
  • 2022
  • Ingår i: Journal of Psychosomatic Obstetrics and Gynaecology. - 0167-482X .- 1743-8942. ; 43:3, s. 298-306
  • Tidskriftsartikel (refereegranskat)abstract
    • Objective: The aim was to investigate birth outcome and birth experience in relation to women’s emotional heslth. An additional aim was to explore the relationship between emotional health, continuity with a known midwife, and the birth experience. Methods: A prospective longitudinal cohort study of 243 women enrolled in a continuity of care project in a rural area in Sweden. Profiles were constructed from instruments measuring depressive symptoms, worries, fear of birth, and sense of coherence. Antenatal and birth records and questionnaires were used to collect data. Result: Women were categorized into two cluster profiles: “emotionally healthy” vs. “emotionally unhealthy”. Women in the “emotionally unhealthy” cluster had a less positive birth experience (p = 0.006). The total score of the Childbirth Experience Questionnaire was highest in women who had had a known midwife assisting at birth. Babies born to women in the “emotionally unhealthy” cluster were more likely to have a severe neonatal diagnosis. Conclusion: There were few differences in birth outcome between the clusters, while there were explicit differences in the childbirth experience. Having a known midwife is important to warrant women a more positive childbirth experience. Screening with validated instruments during antenatal care could be a first step to further investigate women’s emotional well-being and provide targeted psychosocial support. 
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63.
  • Hoffland, Ellis, et al. (författare)
  • The role of fungi in weathering
  • 2004
  • Ingår i: Frontiers in Ecology and Environment. - 1540-9295 .- 1540-9309. ; 2:5, s. 258-264
  • Tidskriftsartikel (refereegranskat)abstract
    • No rock at the Earth’s surface escapes weathering. This process is the primary source of all the essential elements for organisms, except nitrogen and carbon. Since the onset of terrestrial life, weathering has been accelerated under the influence of biota. The study of biological weathering started at the end of the 19th century. Although the role of bacteria (Eubacteria, Archaea) has attracted a lot of interest, until recently the role of fungi has largely been neglected. More recently, however, fungal weathering has become an increasingly important focus of biogeochemical research.
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64.
  • Holmgren, Rebecka, et al. (författare)
  • Coping and financial strain as predictors of mental illness in over-indebted individuals in Sweden
  • 2019
  • Ingår i: Scandinavian Journal of Psychology. - : Wiley. - 0036-5564 .- 1467-9450. ; 60:1, s. 50-58
  • Tidskriftsartikel (refereegranskat)abstract
    • This cross-sectional study examined psychological mechanisms in order to increase knowledge regarding mental illness amongst 561 over-indebted individuals in Sweden. Differences were explored between individuals with probable clinical depression and/or anxiety and individuals without probable clinical depression and/or anxiety, considering objective measures of the debt, financial strain, coping strategies as well as sociodemographic variables. Furthermore, binary logistic regression analyses were performed in order to construct a model of predictors of mental illness. In order to collect the data, Hospital Anxiety and Depression Scale (HADS), Brief Coping Orientation to Problems Experienced (COPE_, as well as questions formulated by the research team, were used as measures. Prominent results showed that over-indebted individuals with probable clinical depression and/or anxiety were younger, showed greater levels of financial strain, used adaptive coping strategies to a lesser extent, and maladaptive coping strategies to a greater extent. Additionally, financial strain, use of maladaptive and emotion-focused coping, age and employment status were significant predictors of mental illness. These results put emphasis on the importance of adaptive coping as well as the psychological exposure of over-indebted individuals. 
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65.
  • Höglund, Carina, et al. (författare)
  • Stability of (B4C)-B-10 thin films under neutron radiation
  • 2015
  • Ingår i: Radiation Physics and Chemistry. - : Elsevier BV. - 0969-806X .- 1879-0895. ; 113, s. 14-19
  • Tidskriftsartikel (refereegranskat)abstract
    • Thin films of (B4C)-B-10 have shown to be very suitable as neutron-converting material in the next generation of neutron detectors, replacing the previous predominantly used He-3. In this contribution we show under realistic conditions that (B4C)-B-10 films are not damaged by the neutron irradiation and interactions, which they will be exposed to under many years in a neutron detector. 1 mu m thick (B4C)-B-10 thin films were deposited onto Al or Si substrates using dc magnetron sputtering. As-deposited films were exposed to a cold neutron beam with fluences of up to 1.1 x 10(14) cm(-2) and a mean wavelength of 6.9 angstrom. Both irradiated and as-deposited reference samples were characterized with time-of-flight elastic recoil detection analysis, scanning electron microscopy, transmission electron microscopy, X-ray photoemission spectroscopy, and X-ray diffraction. We show that only 1.8 ppm of the B-10 atoms were consumed and that the film composition does not change by the neutron interaction within the measurement accuracy. The irradiation does not deteriorate the film adhesion and there is no indication that it results in increased residual stress values of the as-deposited films of 0.095 GPa. From what is visible with the naked eye and down to atomic level studies, no change from the irradiation could be found using the above-mentioned characterization techniques. (C) 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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66.
  • Imam, Mewlude, et al. (författare)
  • Trimethylboron as Single-Source Precursor for Boron-Carbon Thin Film Synthesis by Plasma Chemical Vapor Deposition
  • 2016
  • Ingår i: The Journal of Physical Chemistry C. - : American Chemical Society (ACS). - 1932-7447 .- 1932-7455. ; 120:38, s. 21990-21997
  • Tidskriftsartikel (refereegranskat)abstract
    • Boron carbon (BxC) thin films are potential neutron converting layers for B-10-based neutron detectors. However, as common material choices for such detectors do not tolerate temperatures above 500 degrees C, a low temperature deposition route is required. Here, we study trimethylboron B(CH3)(3) (TMB) as a single-source precursor for the deposition of BxC thin films by plasma CVD using Ar plasma. The effect of plasma power, TMB/Ar flow ratio and total pressure, on the film composition, morphology, chemical bonding, and microstructures are investigated. Dense and boron-rich films (B/C = 1.9) are achieved at high TMB flow under a low total pressure and high plasma power, which rendered an approximate substrate temperature of similar to 300 degrees C. Films mainly contain B-C bonds with the presence of B-O and C-C, which is attributed to be the origin of formed amorphous carbon in the films. The high H content 15 +/- 5 at. %) is almost independent of deposition parameters and contributed to lower the film density (2.16 g/cm(3)). The plasma compositional analysis shows that the TMB molecule decomposes to mainly atomic H, C-2, BH, and CH. A plasma chemical model for the decomposition of TMB with BH and CH as the plausible film depositing species in the plasma is proposed.
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67.
  • Issa, F., et al. (författare)
  • Characterization of thermal neutron beam monitors
  • 2017
  • Ingår i: Physical Review Accelerators and Beams. - 2469-9888. ; 20:9
  • Tidskriftsartikel (refereegranskat)abstract
    • Neutron beam monitors with a wide range of efficiencies, low. sensitivity, and high time and space resolution are required in neutron beam experiments to continuously diagnose the delivered beam. In this work, commercially available neutron beam monitors have been characterized using the R2D2 beamline at IFE (Norway) and using a Be-based neutron source. For the. sensitivity measurements different. sources have been used. The evaluation of the monitors includes, the study of their efficiency, attenuation, scattering, and sensitivity to.. In this work we report the results of this characterization.
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68.
  • Jansson, Billy, 1963-, et al. (författare)
  • Is defensiveness associated with cognitive bias away from emotional information?
  • 2005
  • Ingår i: Personality and Individual Differences. - : Elsevier BV. - 1873-3549 .- 0191-8869. ; 39:8, s. 1373-1382
  • Tidskriftsartikel (refereegranskat)abstract
    • The role of defensiveness and repressive coping style for the performance on a combined emotional Stroop and tachistoscopic identification task with masked and unmasked words was studied in a community sample. Defensiveness was associated with a decrease in Stroop interference for masked threat words, but not for unmasked threat words. The most robust results, however, were found with regard to overall test performance (independent of emotional valence). On the emotional Stroop task, high-defensive men (but not women) were faster to colour-name words in general, irrespective of emotional valence. On the tachistoscopic identification task, high-defensive women identified fewer words in general than low-defensive participants. The results are discussed in terms of defensiveness being associated with (a) avoidance of emotional information at an automatic, pre-attentive level, and (b) a general avoidance of potentially emotional information that takes different form in men and women depending on possible differences in what is seen as socially desirable for the two genders
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69.
  • Jansson, Billy, 1963-, et al. (författare)
  • The interactive role of worried mood and trait anxiety in the selective processing of subliminally presented threat words
  • 2006
  • Ingår i: Personality and Individual Differences. - : Elsevier BV. - 1873-3549 .- 0191-8869. ; 41:7, s. 1195-1204
  • Tidskriftsartikel (refereegranskat)abstract
    • The purpose of the present study was threefold: (a) to replicate the finding by MacLeod and Rutherford (1992) that low trait-anxious individuals, in contrast to high trait-anxious individuals, show a selective attention away from subliminally presented threat words at elevated levels of stress; (b) to test the hypothesis that this effect is due to individuals with repressive coping-style rather than true low trait-anxious individuals; and (c) to study the stability of Stroop interference over time. Both social threat and physical threat words were used. Although some support was found for the first hypothesis, there was no evidence that this effect was due to individuals with repressive coping-style. Finally, Stroop interference showed very little test-retest stability from the first to the second testing session, indicating that it is heavily influenced by temporary cognitive-emotional states, and that it should not be treated as a trait variable. Unexpectedly, high defensiveness predicted a decrease in worried mood from session 1 to session 2. (c) 2006 Elsevier Ltd. All rights reserved.
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70.
  • Jebali, R., et al. (författare)
  • A first comparison of the responses of a He-4-based fast-neutron detector and a NE-213 liquid-scintillator reference detector
  • 2015
  • Ingår i: Nuclear Instruments and Methods in Physics Research Section A. - : Elsevier BV. - 0168-9002 .- 1872-9576 .- 0167-5087. ; 794, s. 102-108
  • Tidskriftsartikel (refereegranskat)abstract
    • A first comparison has been made between the pulse-shape discrimination characteristics of a novel He-4-based pressurized scintillation detector and a NE-213 liquicl-scintillator reference detector using an Am/Be mixed-field neutron and gamma-ray source and a high-resolution scintillation-pulse digitizer. In particular, the capabilities of the two fast neutron detectors to discriminate between neutrons and gamma-rays were investigated. The NE-213 liquicl-scintillator reference cell produced a wide range of scintillation-light yields in response to he gamma-ray field of the source. In stark contrast, clue to the size and pressure of the He-4 gas volume, the He-4-based detector registered a maximum scintillation-light yield of 750 keV(ee) to the same gamma-ray field. Pulse-shape discrimination for particles with scintillation-light yields of more than 750 keV(ee) was excellent in the case of the He-4-based detector. Above 750 keV(ee) its signal was unambiguously neutron, enabling particle identification based entirely upon the amount of scintillation light produced. (C) 2015 The Authors. Published by Elsevier B.V.
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