| 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. |
- Abu Hatab, Assem, et al.
(författare)
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COVID-19 risk perception and public compliance with preventive measures : Evidence from a multi-wave household survey in the MENA region
- 2023
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Ingår i: PLOS ONE. - : Public Library of Science (PLoS). - 1932-6203. ; 18:7
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Tidskriftsartikel (refereegranskat)abstract
- This study investigates the association between individuals’ concern about contracting COVID-19 and their compliance with recommended preventive and mitigation measures, namely wearing face masks, maintaining social distancing and handwashing, in the context of the Middle East and North Africa (MENA) region. The empirical analysis is based on a panel dataset from the Combined COVID-19 MENA Monitor Household Survey, which was carried out in Jordan, Morocco, Sudan, Tunisia and Egypt. Applying a probit estimation technique, a positive and statistically significant association was found between the level of COVID-19 worries and individuals’ compliance with the mitigation measures. Notably, the results revealed that this association followed a “first-up-then-down” trend, showing that compliance with the three mitigation measures rose as individuals’ worries about contracting the virus increased, and then markedly decreased after they had been infected. Socio-demographic characteristics contributing to lower levels of compliance included being male, being over 60, having lower levels of education and having a lower household income. A cross-country analysis revealed remarkable differences between the five countries, with the strongest association between COVID-19 concerns and adherence to mitigation measures observed in Tunisia and Sudan, and the weakest association seen in Jordan and Morocco. Policy implications are outlined for effective risk communication and management during disease outbreaks and public health emergencies to encourage appropriate public health behaviours.
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| 3. |
- Abu Hatab, Assem, et al.
(författare)
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Who moves and who gains from internal migration in Egypt?: Evidence from two waves of a labor market panel survey
- 2022
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Ingår i: Habitat International. - : Elsevier. - 0197-3975 .- 1873-5428. ; 124
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Tidskriftsartikel (refereegranskat)abstract
- In recent decades, Egypt has experienced rapid internal migration movements triggered by urbanization, socioeconomic development, and environmental changes. From a literature perspective, few scholarly studies have empirically examined the drivers and welfare impacts of internal migration in Egypt, despite the increasing recognition of its inextricably links to urban sustainability. The present study utilized data from two waves of an Egyptian Labor Market Panel Survey (ELMPS) conducted in 2012 and 2018 and consisting of 63,909 observations to examine factors that determine internal migration decisions and their subsequent welfare effects. The results of the two-stage Heckman selection model indicate that both the determinants of internal migration decisions and welfare outcomes differ appreciably depending on migration stream as well as the socioeconomic characteristics of the migrants. In particular, females were found to be more likely to migrate from rural to urban areas, lending support to the growing literature on the “feminization of migration” in developing countries. The OLS regression results, after correcting for self-selection, make a strong case for the positive welfare gains from internal migration in Egypt. Specially, we found that the welfare gains for older and female migrants are much higher than other age and gender groups. A comparison of the welfare effects between different migration streams shows that all migratory movements were associated with positive and statistically significant welfare gains, except for rural-to-urban migration that was surprisingly found to be associated with significant welfare loss for the migrants. Urban-to-urban migration was found to have the strongest welfare enhancing effects on all migrant groups. The empirical findings underline a number of research and policy implications for a sustainable management of internal migration in Egypt and other countries with similar internal migration trends.
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| 4. |
- Adermark, Louise, 1974, et al.
(författare)
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Prospective association between use of electronic cigarettes and use of conventional cigarettes: a systematic review and meta-analysis
- 2021
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Ingår i: Erj Open Research. - Sheffield : European Respiratory Society (ERS). - 2312-0541. ; 7:3
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Tidskriftsartikel (refereegranskat)abstract
- Objective The aim of this systematic review and meta-analysis was to assess the association between e-cigarette use and subsequent initiation or recurrence of cigarette smoking. Data sources A systematic literature search was finalised on 11 November 2019 using PubMed (including MEDLINE), EMBASE, Cochrane Library, Scopus, PubMed Health, NICE Evidence Search, PROSPERO, CRD and PsycInfo. Study selection Studies were included if meeting the following criteria: reporting empirical results; longitudinal observational design with a minimum of 3 months of follow-up; including general population samples; allowing for the comparison between users and nonusers of e-cigarettes. Studies rated as having high risk of bias were excluded. Studies were independently assessed by at least two authors. The procedures described by PRISMA were followed, and the quality of evidence was rated using GRADE. Data synthesis 30 longitudinal studies from 22 different cohorts assessing e-cigarette use among nonsmokers or never-smokers at baseline, and subsequent use of cigarette smoking at follow-up, were included in this review. A random-effects meta-analysis based on 89076 participants showed a pooled unadjusted odds ratio (OR) of cigarette smoking among baseline nonsmoker e-cigarette users compared with nonusers of 4.68 (CI 3.64-6.02), while the adjusted OR was 3.37 (CI 2.68-4.24). These results were consistent irrespective of whether the outcome was measured as ever-smoking or as past 30-day smoking. The evidence was graded as moderate. Conclusions Use of e-cigarettes may predict the initiation or recurrence of cigarette smoking.
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| 5. |
- Adom, P. K., et al.
(författare)
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Degree of financialization and energy efficiency in Sub-Saharan Africa: do institutions matter?
- 2020
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Ingår i: Financial Innovation. - : Springer Science and Business Media LLC. - 2199-4730. ; 6:1
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Tidskriftsartikel (refereegranskat)abstract
- The United Nations Sustainable Development Goal 7 emphasizes the need for economies around the world to double their efforts in energy efficiency improvements. This is because improvements in energy efficiency can trigger economic growth and considered as one of the 'green' growth strategies due to its carbon free content. To this end, some empirical studies have investigated the nexus between economic growth and energy efficiency, but the effects of the latter on financial indicators have not been sufficiently studied in the literature, at least in developing economies like Africa. This study examines the effect of energy efficiency improvements on commercial bank profitability under different political regimes (i.e., autocratic and democratic political regimes); something previous literature had neglected. The study uses panel data, consisting of 43 African countries and the simultaneous System Generalized Method of Moments. We found that energy efficiency improvement is more likely to induce higher bank profitability in political institutions with the characteristics of centralization of power compared with those with decentralization of power. Furthermore, for the banking sector, the findings suggest that energy utilization behavior of clients should be included in the loan or credit valuation process. For the government, the agenda of energy efficiency should be aggressively pursued while taking cognizance of creating a political environment that weans itself from a 'grandfathering' behavior.
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| 6. |
- Adom, Philip Kofi, et al.
(författare)
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Energy efficiency as a sustainability concern in Africa and financial development: How much bias is involved?
- 2023
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Ingår i: Energy Economics. - : Elsevier. - 0140-9883 .- 1873-6181. ; 120
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Tidskriftsartikel (refereegranskat)abstract
- This study contributes to the literature on whether financial development stimulates technical energy efficiency (TEE) or not, by addressing core biases that creep into the relationship and thereby reducing the ability to draw causal inferences from financial development to TEE. Our approach is based on the instrumental stochastic frontier technique, where biases in the frontier and inefficiency equations are dealt with using external instrumental variables. The legal system origin of the country and life expectancy at birth were used as instruments for financial development and income, respectively. The current study demonstrates substantial bias in income elasticity, the estimate of energy efficiency, and the effect of financial development on energy efficiency. Both income elasticity and energy efficiency estimate risk upward bias. Equally, the effect of financial system development and financial institution development on TEE risk downward bias. Other results show that all aspects of financial institution development stimulate TEE, but access to financial institutions is more important. These results raise caution about future studies' estimates of the effect of financial development on TEE. Though this study has demonstrated the potency of external instruments in dealing with the bias in the coefficient estimates, we consider this might prove to be a luxury solution in some cases due to data limitation, context differences, and theory. In those circumstances, reliance on internal instruments might prove to be the second-best option.
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| 7. |
- Adom, Philip Kofi, et al.
(författare)
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Energy poverty, development outcomes, and transition to green energy
- 2021
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Ingår i: Renewable Energy. - : Elsevier BV. - 0960-1481 .- 1879-0682. ; 178, s. 1337-1352
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Tidskriftsartikel (refereegranskat)abstract
- There is a close connection between energy and development outcomes. Therefore, energy constraints could adversely influence development outcomes. Consequently, building resilience to energy constraints could be one effective channel to improve development outcomes. This study analyses the effect of energy poverty, while considering the influence of green energy transition, on several development outcomes. Our approach delineates the short and long run dynamics of the net effects of energy poverty and renewable energy transition on development outcomes. First, as a direct effect, we find that energy poverty (renewable energy) has a negative (positive) effect on income, education, life expectancy, employment and mobile phone subscription and a positive (negative) effect on poverty, income inequality, sanitation risk and risk of drinking unsafe water. Conditioning the effect of energy poverty on renewable energy, we find that the transition to green energy partially compensates the adverse effects of energy poverty on the various development outcomes considered in this study. Further, we find that, for several of the development outcomes, the risk of inflated energy cost associated with renewable energy transitions in the short-term is likely to neutralise in the long run, except for income poverty and environmental risk factors. We discuss the policy implications.
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| 8. |
- 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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| 9. |
- 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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| 10. |
- 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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