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- Heald, G. H., et al.
(författare)
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The LOFAR Multifrequency Snapshot Sky Survey (MSSS) : I. Survey description and first results
- 2015
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 582, s. 1-22
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Tidskriftsartikel (refereegranskat)abstract
- We present the Multifrequency Snapshot Sky Survey (MSSS), the first northern-sky Low Frequency Array (LOFAR) imaging survey. In this introductory paper, we first describe in detail the motivation and design of the survey. Compared to previous radio surveys, MSSS is exceptional due to its intrinsic multifrequency nature providing information about the spectral properties of the detected sources over more than two octaves (from 30 to 160 MHz). The broadband frequency coverage, together with the fast survey speed generated by LOFAR’s multibeaming capabilities, make MSSS the first survey of the sort anticipated to be carried out with the forthcoming Square Kilometre Array (SKA). Two of the sixteen frequency bands included in the survey were chosen to exactly overlap the frequency coverage of large-area Very Large Array (VLA) and Giant Metrewave Radio Telescope (GMRT) surveys at 74 MHz and 151 MHz respectively. The survey performance is illustrated within the MSSS Verification Field (MVF), a region of 100 square degrees centered at (α,δ)J2000 = (15h,69°). The MSSS results from the MVF are compared with previous radio survey catalogs. We assess the flux and astrometric uncertainties in the catalog, as well as the completeness and reliability considering our source finding strategy. We determine the 90% completeness levels within the MVF to be 100 mJy at 135 MHz with 108″ resolution, and 550 mJy at 50 MHz with 166″ resolution. Images and catalogs for the full survey, expected to contain 150 000–200 000 sources, will be released to a public web server. We outline the plans for the ongoing production of the final survey products, and the ultimate public release of images and source catalogs.
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- Manduca, Robert, et al.
(författare)
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Measuring Absolute Income Mobility : Lessons from North America and Europet
- 2024
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Ingår i: American Economic Journal. - : American Economic Association. - 1945-7782 .- 1945-7790. ; 16:2, s. 1-30
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Tidskriftsartikel (refereegranskat)abstract
- We use linked parent-child administrative data for five countries in North America and Europe, as well as detailed survey data for two more, to investigate methodological challenges in the estimation of absolute income mobility. We show that the commonly used "copula and marginals" approximation methods perform well across countries in our sample, and the greatest challenges to their accuracy stem not from assumptions about relative mobility rates over time but from the use of nonrepresentative marginal income distributions. We also provide a multicountry analysis of sensitivity to specification decisions related to age of income measurement, income concept, family structure, and price index. (JEL D31, G51, I31, J12, J31, J62)
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| 11. |
- Hendriksen, Rene S., et al.
(författare)
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Global monitoring of antimicrobial resistance based on metagenomics analyses of urban sewage
- 2019
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Ingår i: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 10:1
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Tidskriftsartikel (refereegranskat)abstract
- © 2019, The Author(s). Antimicrobial resistance (AMR) is a serious threat to global public health, but obtaining representative data on AMR for healthy human populations is difficult. Here, we use metagenomic analysis of untreated sewage to characterize the bacterial resistome from 79 sites in 60 countries. We find systematic differences in abundance and diversity of AMR genes between Europe/North-America/Oceania and Africa/Asia/South-America. Antimicrobial use data and bacterial taxonomy only explains a minor part of the AMR variation that we observe. We find no evidence for cross-selection between antimicrobial classes, or for effect of air travel between sites. However, AMR gene abundance strongly correlates with socio-economic, health and environmental factors, which we use to predict AMR gene abundances in all countries in the world. Our findings suggest that global AMR gene diversity and abundance vary by region, and that improving sanitation and health could potentially limit the global burden of AMR. We propose metagenomic analysis of sewage as an ethically acceptable and economically feasible approach for continuous global surveillance and prediction of AMR.
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- Munk, Martin D
(författare)
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Livsbaner gennem et felt : En analyse af eliteidraetsudøveres sociale mobilitet og rekonversioner af kapital i det sociale rum
- 1999
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The thesis deals with a theoretical outline of the theory of reconversions in the light of the social space, with an analysis of top level athletes' mobility and strategies of reconversions in their trajectories through the relative autonomous field of sports. Some disciplines in this field have much autonomy, others less, and are positioned according to a state of distribution of the specific capital, accumulated in the consequence of previous struggles. Trajectories and classes are not reproduced in a mechanical way, there are specific effects in those. By the concept of strategies of reconversions it is possible to determine central societal processes according to transformations and reproductions of the social world. They are defined as practices by which social groups endeavour to keep 'on the road' or even change position. In that sense social life is about struggles and converting capital. The thesis builds upon investigations of sports. In an enquete, 1990, I examined whether cycling could be characterized as a field, and included 220 schemes. In 1993, I studied athletes' trajectories through sports, and how these athletes left sports, including 538 athletes distributed on 25 disciplines in the main analysis. Some of those were interviewed, and material about achievements in international championships and the Danish population were applied. I compared central tables with French sociologists in 1994-1996. I have used correspondence analysis according to a French interpretation. The important thing with this type of analysis is that modalities with small frequencies do not get lost, and there is a possibility of using supplementary modalities and individuals. The main thing is to analyse objective relational oppositions. Correspondence analysis is used together with sociological analysis, which is more sensitive towards empirical material and thereby closer to actually social processes. Two aspects in the transitions between the field of sports and the social space are important: the relative short period of time in sports and the objective possibilities after the time in sports. It is clear that the small conversion-rate of capital into a permanent job in sports (after the active period) is closely related to the fact that Denmark is a society with private organized institutions of sports and clubs grounded upon voluntary work, and no state institutions. This is contrary to the United States and France. Fifteen per cent obtain a job in the field, and it primarily concerns athletes from 'upper' and 'middle' classes (academics, teachers and directors) and agents with large volume of sports capital. What seems to be important is the structural homology between the social space and the way in which athletes find their pathways from the field to other places in the social space; capital can be converted on certain conditions. The great amount of movements regarding sons and daughters of self-employed to working class conditions and to positions like teachers reflect a general tendency in society. The correspondence analysis shows two main positions over time, dealing with agents who pass through and spend some time of the trajectory in the field of sports. On one side there is a vocational pole with origin among dominated classes, and on the other side an academic pole primarily with origin among dominating classes. Furthermore the analysis point at a dichotomy between objective opportunities for a professional career in badminton, golf, tennis etc. and no possibilities in curling, orienteering, shooting etc. There is an effect of gravitation/struggle from the field of sports, with the possibility of converting sports capital, but the strategies of reconversions and mobility depend also on the structural homology between the field and the social space mediated by trajectories, and the structure of society.
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