| 1. |
- Aksyutina, Yu, et al.
(författare)
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Lithium isotopes beyond the drip line
- 2008
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Ingår i: Physics Letters B. - : Elsevier BV. - 0370-2693. ; 666:5, s. 430-434
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Tidskriftsartikel (refereegranskat)abstract
- The unbound isotopes 10Li, 12Li and 13Li have been observed after nucleon-knockout reactions at relativistic energies with 11Li and 14Be beams impinging on a liquid hydrogen target. The channels , and were analysed in the ALADIN-LAND setup at GSI. The 10Li data confirm earlier findings, while the 12Li and 13Li nuclei were observed for the first time. The relative-energy spectrum shows that the ground state of 12Li can be described as a virtual s-state with a scattering length of -13.7(1.6) fm. A broad energy spectrum was found for the channel. Based on the assumption that the relative-energy spectrum is dominated by a correlated background presumably stemming from initial correlations in the 14Be ground-state, evidence for a 13Li resonance at 1.47(31) MeV above the threshold with a width around 2 MeV has been found.
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| 2. |
- Aksyutina, Yuliya, 1983, et al.
(författare)
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Properties of the 7He ground state from 8He neutron knockout
- 2009
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Ingår i: Physics Letters B. - : Elsevier BV. - 0370-2693. ; 679:3, s. 191 - 196
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Tidskriftsartikel (refereegranskat)abstract
- The unbound nucleus 7He, produced in neutron-knockout reactions with a 240 MeV/u 8He beam in a liquid-hydrogen target, has been studied in an experiment at the ALADIN-LAND setup at GSI. From an R-matrix analysis the resonance parameters for 7He as well as the spectroscopic factor for the 6He(0+) + n configuration in its ground-state have been obtained. The spectroscopic factor is 0.61 confirming that 7He is not a pure single-particle state. An analysis of 5He data from neutron-knockout reactions of 6He in a carbon target reveals the presence of an s-wave component at low energies in the α+n relative energy spectrum. A possible low-lying exited state in 7He observed in neutron knockout data from 8He in a carbon target and tentatively interpreted as a Iπ=1/2− state, could not be observed in the present experiment. Possible explanations of the shape difference between the 7He resonance obtained in the two knockout reactions are discussed in terms of target-dependence or different reaction mechanisms at relativistic energies.
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| 3. |
- Abraham, Mark James, et al.
(författare)
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Sharing Data from Molecular Simulations
- 2019
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Ingår i: Journal of Chemical Information and Modeling. - : AMER CHEMICAL SOC. - 1549-9596 .- 1549-960X. ; 59:10, s. 4093-4099
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Tidskriftsartikel (refereegranskat)abstract
- Given the need for modern researchers to produce open, reproducible scientific output, the lack of standards and best practices for sharing data and workflows used to produce and analyze molecular dynamics (MD) simulations has become an important issue in the field. There are now multiple well-established packages to perform molecular dynamics simulations, often highly tuned for exploiting specific classes of hardware, each with strong communities surrounding them, but with very limited interoperability/transferability options. Thus, the choice of the software package often dictates the workflow for both simulation production and analysis. The level of detail in documenting the workflows and analysis code varies greatly in published work, hindering reproducibility of the reported results and the ability for other researchers to build on these studies. An increasing number of researchers are motivated to make their data available, but many challenges remain in order to effectively share and reuse simulation data. To discuss these and other issues related to best practices in the field in general, we organized a workshop in November 2018 (https://bioexcel.eu/events/workshop-on-sharing-data-from-molecular-simulations/). Here, we present a brief overview of this workshop and topics discussed. We hope this effort will spark further conversation in the MD community to pave the way toward more open, interoperable, and reproducible outputs coming from research studies using MD simulations.
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| 4. |
- Adermon, Adrian, 1981-, et al.
(författare)
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Dynastic Human Capital, Inequality, and Intergenerational Mobility
- 2021
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Ingår i: American Economic Review. - : American Economic Association. - 0002-8282 .- 1944-7981. ; 111:5, s. 1523-1548
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Tidskriftsartikel (refereegranskat)abstract
- We estimate long-run intergenerational persistence in human capital using information on outcomes for the extended family: the dynasty. A dataset including the entire Swedish population, linking four generations, allows us to identify parents' siblings and cousins, their spouses, and spouses' siblings. Using various human capital measures, we show that traditional parent-child estimates underestimate long-run intergenerational persistence by at least one-third. By adding outcomes for more distant ancestors, we show that almost all of the persistence is captured by the parental generation. Data on adoptees show that at least one-third of -long-term persistence is attributed to environmental factors.
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| 5. |
- Adermon, Adrian
(författare)
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Essays on the Transmission of Human Capital and the Impact of Technological Change
- 2013
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Essay 1: If grandparents have an independent impact on their grandchildren's schooling, intergenerational correlations estimated using two generations will underestimate the true level of intergenerational persistence in education. Recent research has found such multi-generational effects, but there is still no consensus on whether these estimates are due to a direct impact of grandparents on their grandchildren, or if they arise because of measurement error or model misspecification. In this paper, I estimate the intergenerational transmission arising from direct interactions with grandparents by comparing families where the grandparent died before the birth of the grandchild with those where the grandparent lived to meet and spend time with the grandchild. I find that direct effects contribute most, if not all, of the transmission coefficient across three generations.Essay 2: Sibling correlations in education and income have been extensively studied in the literature, and attempts to look inside the correlation have focused on family and neighborhood effects. In this paper I estimate sibling spillovers in education—that is, the effect of an older sibling's schooling on their younger sibling's schooling. To estimate causal effects, I use a compulsory school reform in Sweden in the 1950s to instrument for the older sibling's schooling. I am unable to detect statistically significant sibling spillovers, implying that any such spillovers must be relatively small.Essay 3: (with Che-Yuan Liang) The implementation of a copyright protection reform in Sweden in April 2009 suddenly increased the risk of being caught and prosecuted for illegal file sharing. This paper uses the reform to investigate the effects of illegal file sharing on music and movie sales. We find that the reform decreased Internet traffic by 16 percent during the subsequent six months. It also increased music sales by 36 percent. Furthermore, it had no significant effects on movie sales. We conclude that pirated music is a strong substitute to legal music whereas the substitutability is less for movies.Essay 4: (with Magnus Gustavsson) This paper shows that between 1975 and 2005, Sweden exhibited a pattern of job polarization with expansions of the highest and lowest paid jobs compared to middle-wage jobs. The most popular explanation for such a pattern is the hypothesis of "task-biased technological change", where technological progress reduces the demand for routine middle-wage jobs but increases the demand for non-routine jobs located at the tails of the job-wage distribution. Our estimates, however, do not endorse this explanation for the 1970s and 1980s. Stronger evidence for task biased technological change, albeit not conclusive, is found for the 1990s and 2000s. In particular, there is both a statistically and economically significant growth of non-routine jobs and a decline of routine jobs. No link between wage changes and routine tasks, as would be expected from task-biased technological change, can however be established.
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| 6. |
- Adermon, Adrian, et al.
(författare)
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Intergenerational wealth mobility and the role of inheritance: Evidence from multiple generations
- 2016
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- This study estimates intergenerational correlations in mid-life wealth across three generations, and a young fourth generation, and examines how much of the parent-child association that can be explained by inheritances. Using a Swedish data set we find parent-child rank correlations of 0.3–0.4 and grandparents-grandchild rank correlations of 0.1–0.2. Conditional on parents’ wealth, grandparents’ wealth is weakly positively associated with grandchild’s wealth and the parent-child correlation is basically unchanged if we control for grandparents’ wealth. Bequests and gifts strikingly account for at least 50 per cent of the parent-child wealth correlation while earnings and education are only able to explain 25 per cent.
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| 7. |
- Adermon, Adrian, 1981-, et al.
(författare)
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Intergenerational Wealth Mobility and the Role of Inheritance: Evidence from Multiple Generations
- 2018
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Ingår i: Economic Journal. - : Oxford University Press (OUP). - 0013-0133 .- 1468-0297. ; 128:612, s. F482-F513
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Tidskriftsartikel (refereegranskat)abstract
- This study estimates intergenerational wealth correlations across up to four generations and examines the degree to which the wealth association between parents and children can be explained by inheritances. Using a Swedish data set with newly hand-collected data on wealth and bequests, we find parent-child rank correlations of 0.3-0.4 and grandparent-grandchild rank correlations of 0.1-0.2. Bequests and gifts appear to be central in this process, accounting for at least half of the parent-child wealth correlation while earnings and education can account for only a quarter.
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| 8. |
- Alem, Yonas, 1974, et al.
(författare)
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Distributional preferences in adolescent peer networks
- 2023
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Ingår i: Experimental Economics. - : Springer Science and Business Media LLC. - 1386-4157 .- 1573-6938. ; 26, s. 223-248
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Tidskriftsartikel (refereegranskat)abstract
- We study distributional preferences in adolescent peer networks. Using incentivized choices between allocations for themselves and a passive agent, children are classified into efficiency-loving, inequality-loving, inequality-averse, and spiteful types. We find that pairs of students who report a friendship link are more likely to exhibit the same preference type than other students who attend the same school. The relation between types is almost completely driven by inequality-loving and spiteful types. The role of peer networks in explaining distributional preferences goes beyond network composition effects. A low rank in academic performance and a central position within the network relate positively to a higher likelihood of being classified as spiteful. Hence, social hierarchies seem to be correlated with distributional preference types.
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| 9. |
- Apelgren, Peter, et al.
(författare)
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Vascularization of tissue engineered cartilage-Sequential in vivo MRI display functional blood circulation
- 2021
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Ingår i: Biomaterials. - : Elsevier BV. - 0142-9612 .- 1878-5905. ; 276
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Tidskriftsartikel (refereegranskat)abstract
- Establishing functional circulation in bioengineered tissue after implantation is vital for the delivery of oxygen and nutrients to the cells. Native cartilage is avascular and thrives on diffusion, which in turn depends on proximity to circulation. Here, we investigate whether a gridded three-dimensional (3D) bioprinted construct would allow ingrowth of blood vessels and thus prove a functional concept for vascularization of bioengineered tissue. Twenty 10 x 10 x 3-mm 3Dbioprinted nanocellulose constructs containing human nasal chondrocytes or cell-free controls were subcutaneously implanted in 20 nude mice. Over the next 3 months, the mice were sequentially imaged with a 7 T small-animal MRI system, and the diffusion and perfusion parameters were analyzed. The chondrocytes survived and proliferated, and the shape of the constructs was well preserved. The diffusion coefficient was high and well preserved over time. The perfusion and diffusion patterns shown by MRI suggested that blood vessels develop over time in the 3D bioprinted constructs; the vessels were confirmed by histology and immunohistochemistry. We conclude that 3D bioprinted tissue with a gridded structure allows ingrowth of blood vessels and has the potential to be vascularized from the host. This is an essential step to take bioengineered tissue from the bench to clinical practice.
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| 10. |
- Axbard, Sebastian, 1987-
(författare)
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Crime, Corruption and Development
- 2016
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Essay I: Prosecuting and convicting corrupt officials is a common strategy to combat corruption. Despite this, little is known about the effectiveness of such anti-corruption policies. Theoretically it has been argued that convictions might not achieve much in a highly corrupt environment, since incentives are likely to favor persistence of corrupt behavior. This study investigates the causal effect of convicting corrupt local officials by exploiting exogenous variation in the probability of conviction caused by the random assignment of cases to differently strict justices in the Philippines. Results show that convictions affect both who the local leaders are and the policy choices they make. In particular, families lose their monopoly power over the local government and spending is re-directed from general administrative items (e.g. mayoral office) towards public goods provision. In the long run, this leads to fewer corruption cases and a suggestive improvement of governance. An investigation of the mechanism proposes that the information provided by convictions is important in the political process. This illustrates the complimentary role that political and judiciary institutions can have in the fight against corruption.Essay II (with Jonas Poulsen and Anja Tolonen): The role of extractive industries for development is highly debated. A large literature focusing on poor countries with weak institutions has shown that such industries can spur conflict and war by providing appropriable resources. This study investigates whether this relationship persists later in the development process. More specifically, we examine whether the extensive mining industry in South Africa affects local property and violent crime. To estimate the causal effect, our empirical strategy exploits local production changes caused by fluctuations in international mineral prices. In contrast to earlier studies, we find that an increase in mining activity lowers the local crime rate. Several tests suggest that this effect is driven by better income opportunities, affecting the opportunity cost of engaging in criminal activity. In order for this effect to materialize, local institutional quality needs to be sufficiently high. If such conditions are met, the appropriation channel emphasized in the earlier literature is dominated by the change in opportunity costs of crime. Essay III: The effect of climatic variation on conflict and crime is well established, but less is known about the mechanism through which this effect operates. This study contributes to the literature by exploiting a new source of exogenous variation in climate to study the effect of fishermen's income opportunities on sea piracy. Using satellite data to construct a monthly measure of local fishing conditions it is found that better income opportunities reduce piracy. A wide range of approaches are employed to ensure that these effects are driven by income opportunities rather than other mechanisms through which climate could affect piracy.
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