| 11. |
- Lindskog, Anders
(författare)
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Palaeoenvironmental significance of cool- water microbialites in the Darriwilian ( Middle Ordovician) of Sweden
- 2014
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Ingår i: Lethaia. - : Scandinavian University Press / Universitetsforlaget AS. - 0024-1164. ; 47:2, s. 187-204
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Tidskriftsartikel (refereegranskat)abstract
- Well-developed oncoids and centimetre-sized stromatolites are reported for the first time from the Darriwilian (Middle Ordovician) cool-water orthoceratite limestone' at Kinnekulle, Vastergotland, Sweden. The characteristics and stratigraphical distribution of these microbialites show an apparent relationship to fluctuations in relative sea level. The most abundant and well-developed oncoids occur in stratigraphical intervals that are characterized by notable sea-level lowstands. Stromatolites, which share many compositional characteristics with the oncoids, are essentially confined to a single bed associated with an especially prominent lowstand. Stromatolite-like lamination also occurs in the uppermost part of the studied succession, but this feature may be of abiogenic origin. The microbialites appear to be originally calcareous, but synsedimentary iron- and/or phosphate-enriched laminae are conspicuous, and secondary substitution by coarse calcite and barite is common. Iron staining is most prominent in poorly preserved specimens. Diagenesis has occluded the identity of the producers of these microbialites, but characteristics of associated endolithic borings suggest that they were formed in photic waters. The laminated fabrics of the documented microbialites record a depositional environment sensitive to high-frequency environmental change. Most significantly, the microbialites have provided important information about the depositional environment of their enigmatic host limestone, and the collective observations challenge the notion that the studied strata were deposited in a deep shelf to basinal environment - rather, it appears that they are to a large extent, shallow-water deposits, formed in waters only a few tens of metres deep.
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| 12. |
- Lindskog, Anders, et al.
(författare)
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The Volkhov-Kunda transition and the base of the Holen Limestone at Kinnekulle, Västergötland, Sweden
- 2014
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Ingår i: GFF. - : Informa UK Limited. - 2000-0863 .- 1103-5897. ; 136:1, s. 167-171
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Tidskriftsartikel (refereegranskat)abstract
- The transition between the Volkhov and Kunda Baltoscandian stages (Darriwilian, Middle Ordovician) is associated with a notable sea-level fall. This study documents the lithologic and sedimentologic expression of this event in the orthoceratite limestone at the Hällekis quarry, Kinnekulle, Sweden. The uppermost Volkhov strata are characterized by abundant limonitic hardgrounds and relatively coarse carbonate textures, including intraclasts and ferruginous coated grains. The top of a conspicuous wacke-packstone interval is identified as the local Volkhov-Kunda and Lanna Limestone-Holen Limestone boundary. The boundary is overlain by marly limestone, in which limonitic hardgrounds become uncommon and a temporary fining of carbonate textures occurs. An overall trend of increasing (mainly skeletal) grain concentration and diversity is seen throughout the studied succession. Based on the collective observations, a sea-level curve for the upper Volkhov and lower Kunda is presented.
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| 13. |
- Lindskog, Erik, 1988, et al.
(författare)
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A Method for Determining the Environmental Footprint of Industrial Products Using Simulation
- 2011
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Ingår i: Proceedings - Winter Simulation Conference. - 0891-7736. - 9781457721083 ; , s. 2131-2142
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Konferensbidrag (refereegranskat)abstract
- Effective assessment and communication of the environmental footprint is increasingly important to process development and marketing purposes. Traditionally, static methods have been applied to analyze the environmental impact during a product’s life cycle; however, they are unable to incorporate dynamic aspects of real world operations. This paper discusses a method using Discrete Event Simulation (DES) to analyze production systems and simultaneously enable labeling of products’ environmental footprint. The method steps include data management, determination of environmental footprint, and communication of the results. The method is developed during a case study of a job-shop-production facility. To evaluate theDES method, the DES results were compared with the results of a Simplified Life Cycle Assessment (SLCA) conducted on the same production system. The case study demonstrates the possibility for the DES method to determine the variation between products in terms of the environmental footprint andhighlights some of the difficulties involved.
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| 14. |
- Lindskog, Marcus, 1980-, et al.
(författare)
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Are all Data Created Equal? : Exploring Some Boundary Conditions for a Lazy Intuitive Statistician
- 2014
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Ingår i: PLOS ONE. - : Public Library of Science (PLoS). - 1932-6203. ; 9:5, s. e97686-
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Tidskriftsartikel (refereegranskat)abstract
- The study investigated potential effects of the presentation order of numeric information on retrospective subjective judgments of descriptive statistics of this information. The studies were theoretically motivated by the assumption in the naive sampling model of independence between temporal encoding order of data in long-term memory and retrieval probability (i.e. as implied by a "random sampling'' from memory metaphor). In Experiment 1, participants experienced Arabic numbers that varied in distribution shape/variability between the first and the second half of the information sequence. Results showed no effects of order on judgments of mean, variability or distribution shape. To strengthen the interpretation of these results, Experiment 2 used a repeated judgment procedure, with an initial judgment occurring prior to the change in distribution shape of the information half-way through data presentation. The results of Experiment 2 were in line with those from Experiment 1, and in addition showed that the act of making explicit judgments did not impair accuracy of later judgments, as would be suggested by an anchoring and insufficient adjustment strategy. Overall, the results indicated that participants were very responsive to the properties of the data while at the same time being more or less immune to order effects. The results were interpreted as being in line with the naive sampling models in which values are stored as exemplars and sampled randomly from long-term memory.
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| 15. |
- Lindskog, Marcus, et al.
(författare)
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Are there rapid feedback effects on Approximate Number System acuity?
- 2013
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Ingår i: Frontiers in Human Neuroscience. - : Frontiers Media SA. - 1662-5161. ; 7, s. 270-
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Tidskriftsartikel (refereegranskat)abstract
- Humans are believed to be equipped with an Approximate Number System (ANS) that supports non-symbolic representations of numerical magnitude. Correlations between individual measures of the precision of the ANS and mathematical ability have raised the question of whether the precision can be improved by feedback training. A study (DeWind and Brannon, 2012) reported improvement in discrimination precision occurring within 600700 trials of feedback, suggesting ANS malleability with rapidly improving acuity in response to feedback. We tried to replicate the rapid improvement in a control group design, while controlling for the use of perceptual cues. The results indicate no learning effects, but a minor constant advantage for the feedback group. The measures of motivation suggest that feedback has a positive effect on motivation and that the difference in discrimination is due to the greater motivation of participants with feedback. These results suggest that at least for adults the number sense may not respond to feedback in the short-term.
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| 16. |
- Lindskog, Marcus, 1980-, et al.
(författare)
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Calculate or wait : Is man an eager or a lazy intuitive statistician?
- 2013
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Ingår i: Journal of Cognitive Psychology. - : Informa UK Limited. - 2044-5911 .- 2044-592X. ; 25:8, s. 994-1014
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Tidskriftsartikel (refereegranskat)abstract
- Research on people’s ability to act as intuitive statisticians has mainly focused on the accuracy of estimates of central tendency and variability. In this paper, we investigate two hypothesised cognitive processes by which people make judgements of distribution shape. The first claims that people spontaneously induce abstract representations of distribution properties from experience, including about distribution shape. The second process claims that people construct beliefs about distribution properties post hoc by retrieval from long-term memory of small samples from the distribution, implying format dependence with accuracy that differs depending on judgement format. Results from two experiments confirm the predicted format dependence, suggesting that people are often constrained by the post hoc assessment of distribution properties by sampling from long-term memory. The results, however, also suggest that, although post hoc sampling from memory seems to be the default process, under certain predictable circumstances people do induce abstract representations of distribution shape.
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