| 1. |
- Abel, Martin, et al.
(författare)
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Collision-induced absorption by supermolecular complexes from a new potential energy and induced dipole surface, suited for calculations up to thousands of kelvin
- 2010
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Ingår i: 20th International Conference on Spectral Line Shapes. - Melville, NY : American Institute of Physics (AIP). - 9780735408456 ; , s. 251-257
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Konferensbidrag (refereegranskat)abstract
- Absorption by pairs of H2 molecules is an important opacity source in the atmospheres of the outer planets, and thus of special astronomical interest. The emission spectra of cool white dwarf stars differ significantly from the expected blackbody spectra, amongst other reasons due to absorption by H2-H2, H2-He, and H2-H collisional complexes in the stellar atmospheres. To model the radiative processes in these atmospheres, which have temperatures of several thousand kelvin, one needs accurate knowledge of the induced dipole (ID) and potential energy surfaces (PES) of such collisional complexes. These come from quantum-chemical calculations with the H2 bonds stretched or compressed far from equilibrium. Laboratory measurements of collision-induced (CI) absorption exist only at much lower temperature. For H2 pairs at room temperature, the calculated spectra of the rototranslational band, the fundamental band, and the first overtone match the experimental data very well. In addition, with the newly obtained IDS it became possible to reproduce the measurements in the far blue wing of the rototranslational spectrum of H2 at 77.5 K, as well as at 300 K. Similarly good agreement between theory and measurement is seen in the fundamental band of molecular deuterium at room temperature. Furthermore, we also show the calculated absorption spectra of H2-He at 600 K and of H2-H2 at 2,000 K, for which there are no experimental data for comparison
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| 2. |
- Ahlborg, Helene, 1980, et al.
(författare)
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Provision of electricity to African households : The importance of democracy and institutional quality
- 2015
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Ingår i: Energy Policy. - : Elsevier BV. - 0301-4215 .- 1873-6777. ; 87, s. 125-135
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Tidskriftsartikel (refereegranskat)abstract
- How can differences in per capita household electricity consumption across African countries be understood? Based on theories that highlight the importance of democracy and institutional quality for provision of public goods, the aim of the paper is to analyse the degree to which the level of per capita household electricity consumption in African countries can be attributed to the countries’ democratic status and their institutional quality. We rely on regression analysis employing a pooled data set for 44 African countries over the time period 1996–2009. The analysis shows that democracy and institutional quality both have significant positive effects on per capita household consumption of electricity. Our results have implications for how energy sector reforms are promoted in developing countries. At a more general level they illustrate that institution-building policy efforts are relevant also in areas where contemporary debates have tended to primarily centre on economic development, financial prerequisites and ownership issues.
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| 3. |
- Ahlén, Gustaf, et al.
(författare)
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Mannosylated mucin-type immunoglobulin fusion proteins enhance antigen-specific antibody and T lymphocyte responses
- 2012
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Ingår i: PLOS ONE. - : Public Library of Science (PLoS). - 1932-6203. ; 7:10
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Tidskriftsartikel (refereegranskat)abstract
- Targeting antigens to antigen-presenting cells (APC) improve their immunogenicity and capacity to induce Th1 responses and cytotoxic T lymphocytes (CTL). We have generated a mucin-type immunoglobulin fusion protein (PSGL-1/mIgG2b), which upon expression in the yeast Pichia pastoris became multivalently substituted with O-linked oligomannose structures and bound the macrophage mannose receptor (MMR) and dendritic cell-specific intercellular adhesion molecule-3 grabbing non-integrin (DC-SIGN) with high affinity in vitro. Here, its effects on the humoral and cellular anti-ovalbumin (OVA) responses in C57BL/6 mice are presented.OVA antibody class and subclass responses were determined by ELISA, the generation of anti-OVA CTLs was assessed in 51Cr release assays using in vitro-stimulated immune spleen cells from the different groups of mice as effector cells and OVA peptide-fed RMA-S cells as targets, and evaluation of the type of Th cell response was done by IFN-γ, IL-2, IL-4 and IL-5 ELISpot assays.Immunizations with the OVA − mannosylated PSGL-1/mIgG2b conjugate, especially when combined with the AbISCO®-100 adjuvant, lead to faster, stronger and broader (with regard to IgG subclass) OVA IgG responses, a stronger OVA-specific CTL response and stronger Th1 and Th2 responses than if OVA was used alone or together with AbISCO®-100. Also non-covalent mixing of mannosylated PSGL-1/mIgG2b, OVA and AbISCO®-100 lead to relatively stronger humoral and cellular responses. The O-glycan oligomannoses were necessary because PSGL-1/mIgG2b with mono- and disialyl core 1 structures did not have this effect.Mannosylated mucin-type fusion proteins can be used as versatile APC-targeting molecules for vaccines and as such enhance both humoral and cellular immune responses.
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| 4. |
- Alem, Yonas, 1974, et al.
(författare)
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The persistence of subjective poverty in urban Ethiopia
- 2014
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Ingår i: World Development. - : Elsevier BV. - 0305-750X .- 1873-5991. ; 56:1, s. 51-61
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Tidskriftsartikel (refereegranskat)abstract
- Using data spanning 15 years, we study subjective and consumption poverty in urban Ethiopia. Despite rapid economic growth and declining consumption poverty, subjective poverty remains largely unchanged. We find that households with a history of poverty continue to perceive themselves as poor even if their material consumption improves. The relative economic position of households is a strong determinant of subjective poverty. Having some type of employment makes households less likely to perceive themselves as poor, even if they remain in objective poverty. We argue that any analysis to measure the impact of growth on welfare should also encompass subjective measures.
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| 5. |
- Alrifaiy, Ahmed, et al.
(författare)
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A lab-on-a-chip for hypoxic patch clamp measurements combined with optical tweezers and spectroscopy : first investigations of single biological cells
- 2015
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Ingår i: Biomedical engineering online. - : Springer Science and Business Media LLC. - 1475-925X. ; 14
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Tidskriftsartikel (refereegranskat)abstract
- The response and the reaction of the brain system to hypoxia is a vital research subject that requires special instrumentation. With this research subject in focus, a new multifunctional lab-on-a-chip (LOC) system with control over the oxygen content for studies on biological cells was developed. The chip was designed to incorporate the patch clamp technique, optical tweezers and absorption spectroscopy. The performance of the LOC was tested by a series of experiments. The oxygen content within the channels of the LOC was monitored by an oxygen sensor and verified by simultaneously studying the oxygenation state of chicken red blood cells (RBCs) with absorption spectra. The chicken RBCs were manipulated optically and steered in three dimensions towards a patch-clamp micropipette in a closed microfluidic channel. The oxygen level within the channels could be changed from a normoxic value of 18% O 2 to an anoxic value of 0.0-0.5% O 2. A time series of 3 experiments were performed, showing that the spectral transfer from the oxygenated to the deoxygenated state occurred after about 227 ± 1 s and a fully developed deoxygenated spectrum was observed after 298 ± 1 s, a mean value of 3 experiments. The tightness of the chamber to oxygen diffusion was verified by stopping the flow into the channel system while continuously recording absorption spectra showing an unchanged deoxygenated state during 5400 ± 2 s. A transfer of the oxygenated absorption spectra was achieved after 426 ± 1 s when exposing the cell to normoxic buffer. This showed the long time viability of the investigated cells. Successful patching and sealing were established on a trapped RBC and the whole-cell access (Ra) and membrane (Rm) resistances were measured to be 5.033 ± 0.412 M Ω and 889.7 ± 1.74 M Ω respectively.
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| 6. |
- Amuakwa-Mensah, Franklin, et al.
(författare)
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Gender dimension of migration decisions in Ghana: The reinforcing role of anticipated welfare of climatic effect
- 2019
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Ingår i: International Journal of Computational Economics and Econometrics. - : InderScience Publishers. - 1757-1170 .- 1757-1189. ; 9:3, s. 181-201
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Tidskriftsartikel (refereegranskat)abstract
- Copyright © 2019 Inderscience Enterprises Ltd. The concept of migration has been a male phenomenon in time past, however, there has been a change in events as females are gradually gaining dominance in migration patterns in recent times. Using nationwide survey data this paper investigates the determinants of internal migration decisions for males and females in Ghana. We examined whether there is any significant differences in how climate elements together with anticipated welfare gains and socio-economic factors explain internal migration decision of males and females. We find some variations in the determinants of migration decisions for males and female, though these decisions are significantly affected by anticipated welfare gain, socio-economic factors and climate conditions. We observed that females respond more to climate or environmental elements than males. Moreover, the effect of climate on migration decisions for both males and females is reinforced by anticipated welfare gain.
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| 7. |
- Andersson, Camilla, 1979-, et al.
(författare)
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Impacts of the Productive Safety Net Program in Ethiopia on livestock and tree holdings of rural households
- 2011
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Ingår i: Journal of Development Economics. - : Elsevier BV. - 0304-3878 .- 1872-6089. ; 94:1, s. 119-126
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Tidskriftsartikel (refereegranskat)abstract
- We evaluated the impacts of the Ethiopian Productive Safety Net Program (PSNP) on rural households' holdings of livestock and forest assets/trees. We found no indication that participation in PSNP induces households to disinvest in livestock or trees. In fact, households that participated in the program increased the number of trees planted, but there was no increase in their livestock holdings. We found no strong evidence that the PSNP protects livestock in times of shock. Shocks appear to lead households to disinvest in livestock, but not in trees. Our results suggest that there is increased forestry activity as a result of PSNP, and that improved credit access encourages households to increase their livestock holdings.
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| 8. |
- Andersson, Ninnie, 1984-
(författare)
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Making space for assessment : dance teachers’ experiences of learning and teaching prerequisites
- 2018
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Ingår i: Research in Dance Education. - : Taylor & Francis. - 1464-7893 .- 1470-1111. ; 19:3, s. 274-293
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study is to illuminate and discuss assessment within dance education in Swedish upper secondary schools through teachers’ reflections. The study investigates how teachers reflect upon the range of possibilities explored and difficulties encountered in their assessment practice. In order to be able to comprehend the phenomenon of teachers’ reflections regarding their assessment practice, both written and verbal teacher reflections were gathered by means of seven interviews with four teachers, and one trilateral talk. Four teachers participated in the study. In the analytical process, the phenomenon was seen, broadened, varied, and then condensed into two themes: Conditions for assessment for learning and Making space for assessment. Both themes have aspects, which are intertwined: both include conditions for assessment as seen through various modalities, methods and tools.
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| 9. |
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| 10. |
- Antipov, Sergey V., 1986, et al.
(författare)
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Spin-orbit and rotational couplings in radiative association of C((3)P) and N((4)S) atoms.
- 2011
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Ingår i: The Journal of chemical physics. - : AIP Publishing. - 1089-7690 .- 0021-9606. ; 135:18
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Tidskriftsartikel (refereegranskat)abstract
- The role of spin-orbit and rotational couplings in radiative association of C((3)P) and N((4)S) atoms is investigated. Couplings among doublet electronic states of the CN radical are considered, giving rise to a 6-state model of the process. The solution of the dynamical problem is based on the L(2) method, where a complex absorbing potential is added to the Hamiltonian operator in order to treat continuum and bound levels in the same manner. Comparison of the energy-dependent rate coefficients calculated with and without spin-orbit and rotational couplings shows that the couplings have a strong effect on the resonance structure and low-energy baseline of the rate coefficient.
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