| 1. |
- Ahlberg, Per, et al.
(författare)
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Cambrian stratigraphy of the Tomten-1 drill core, Västergötland, Sweden
- 2016
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Ingår i: GFF. - : Informa UK Limited. - 1103-5897 .- 2000-0863. ; 138:4, s. 490-501
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Tidskriftsartikel (refereegranskat)abstract
- The Tomten-1 drilling at Torbjörntorp in Västergötland, southern Sweden, penetrated 29.85 m of Cambrian Series 2, Cambrian Series 3, Furongian, and Lower–Middle Ordovician strata. Lithostratigraphically, the succession includes the File Haidar, Borgholm and Alum Shale formations, and the Latorp and Lanna limestones. The drill core succession is described herein for the first time, with special focus on the biostratigraphy of the Cambrian Alum Shale Formation. In the Cambrian Series 3, through Furongian Alum Shale Formation, agnostoids and trilobites have been identified to species level and the succession is subdivided into nine biozones (in ascending order): the Ptychagnostus gibbus, Ptychagnostus atavus, Lejopyge laevigata, Agnostus pisiformis, Olenus gibbosus, Parabolina spinulosa, Ctenopyge tumida, Ctenopyge bisulcata and Ctenopyge linnarssoni zones. The succession is interrupted by numerous stratigraphic gaps of variable magnitudes, as is evident from the biostratigraphy and conspicuous unconformities.
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| 2. |
- AHLBERG, PER, et al.
(författare)
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Integrated Cambrian biostratigraphy and carbon isotope chemostratigraphy of the Grönhögen-2015 drill core, Öland, Sweden
- 2019
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Ingår i: Geological Magazine. - 0016-7568. ; 156:06, s. 935-949
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Tidskriftsartikel (refereegranskat)abstract
- The Grönhögen-2015 core drilling on southern Öland, Sweden, penetrated 50.15 m of Cambrian Series 3, Furongian and Lower–Middle Ordovician strata. The Cambrian succession includes the Äleklinta Member (upper Stage 5) of the Borgholm Formation and the Alum Shale Formation (Guzhangian–Tremadocian). Agnostoids and trilobites allowed subdivision of the succession into eight biozones, in ascending order: the uppermost Cambrian Series 3 (Guzhangian) Agnostus pisiformis Zone and the Furongian Olenus gibbosus, O. truncatus, Parabolina spinulosa, Sphaerophthalmus? flagellifer, Ctenopyge tumida, C. linnarssoni and Parabolina lobata zones. Conspicuous lithologic unconformities and the biostratigraphy show that the succession is incomplete and that there are several substantial gaps of variable magnitudes. Carbon isotope analyses (δ13Corg) through the Alum Shale Formation revealed two globally significant excursions: the Steptoean Positive Carbon Isotope Excursion (SPICE) in the lower–middle Paibian Stage, and the negative Top of Cambrian Excursion (TOCE), previously referred to as the HERB Event, in Stage 10. The δ13Corg chemostratigraphy is tied directly to the biostratigraphy and used for an improved integration of these excursions with the standard agnostoid and trilobite zonation of Scandinavia. Their relations to that of coeval successions in Baltoscandia and elsewhere are discussed. The maximum amplitudes of the SPICE and TOCE in the Grönhögen succession are comparable to those recorded in drill cores retrieved from Scania, southern Sweden. The results of this study will be useful for assessing biostratigraphic relations between shale successions and carbonate facies on a global scale.
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| 3. |
- Ahlberg, Per, et al.
(författare)
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Miaolingian (Cambrian) trilobite biostratigraphy and carbon isotope chemostratigraphy in the Tingskullen drill core, Öland, Sweden
- 2021
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Ingår i: Estonian Journal of Earth Sciences. - : Estonian Academy Publishers. - 1736-7557 .- 1736-4728. ; 70:1, s. 18-35
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Tidskriftsartikel (refereegranskat)abstract
- The Cambrian succession of the Tingskullen drill core from northern Öland comprises Cambrian Series 2 and Miaolingian (Wuliuan Stage) siliciclastic strata. The major portion of the succession is represented by the Miaolingian Borgholm Formation, which, in ascending order, is subdivided into the Mossberga, Bårstad and Äleklinta members. The Äleklinta Member is barren of body fossils, whereas the Mossberga and Bårstad members are moderately to highly fossiliferous and biostratigraphically reasonably well constrained. Trilobites and agnostoids from the Bårstad Member are indicative of the Acadoparadoxides pinus Zone.The Mossberga Member has not yielded any zonal guide fossils but is tentatively assigned to the Eccaparadoxides insularis Zone. A δ13Corg curve throughout the Borgholm Formation shows a general positive trend upsection without any distinctive excursion, suggesting that the Wuliuan Acadoparadoxides (Baltoparadoxides) oelandicus Superzone (the ‘Oelandicus beds’) of Öland is younger than the negative Redlichiid–Olenellid Extinction Carbon isotope Excursion (ROECE), which is known from near the top of Stage 4 and close to the traditional ‘Lower–Middle Cambrian boundary’ in several parts of the world.
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| 4. |
- Bergström, Stig M., et al.
(författare)
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Darriwili (Keskordoviitsiumi) δ13Corg kemostratigraafia koos graptoliitide biostratigraafiaga klassikalisel röstånga alal skåne maakonna loodeosas lõunarootsis
- 2020
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Ingår i: Estonian Journal of Earth Sciences. - : Estonian Academy Publishers. - 1736-4728. ; 69:3, s. 121-133
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Tidskriftsartikel (refereegranskat)abstract
- The largely covered Middle Ordovician succession in the classic geological Röstånga area in northwestern Scania has not been studied for some 80 years. A new drill core through a succession ranging from the lower–middle Darriwilian to the lower Sandbian has provided a unique opportunity to investigate the graptolite biostratigraphy and the δ13Corg chemostratigraphy, and clarify their stratigraphic relations, through this ~90 m thick interval, which is developed within a black shale facies. The lithology, biostratigraphy and chemostratigraphy are closely similar to those of the coeval strata in the Fågelsång area, southcentral Scania, including the presence of the Fågelsång Phosphorite, which was previously unrecorded in the Röstånga area. The new data are particularly important in providing evidence of the relations between graptolite biostratigraphy and δ13Corg chemostratigraphy. The Fågelsång3 and Röstånga2 drill core successions are currently the only Darriwilian sequences in the world where these relations have been well established.
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| 5. |
- Bergström, Stig M., et al.
(författare)
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Darriwilian (Middle Ordovician) chemostratigraphy linked to graptolite, conodont and trilobite biostratigraphy in the Fågelsång-3 drill core, Scania, Sweden
- 2018
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Ingår i: GFF. - : Informa UK Limited. - 2000-0863 .- 1103-5897. ; 140:3, s. 229-240
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Tidskriftsartikel (refereegranskat)abstract
- A recent core drilling in the geologically classical Fågelsång area resulted in a 58.70-m-long drill core through the lowermost Sandbian Sularp Shale, the Darriwilian Almelund Shale and Komstad Limestone, and part of the late Tremadocian to earliest Darriwilian Tøyen Shale. The shales contain zone index graptolites that are used for an update of the standard Darriwilian graptolite zone succession in Baltoscandia in which six zones are now recognized. The Komstad Limestone interval and lowermost part of the Almelund Shale have beensubdivided into four conodont zones. The δ13Corg chemostratigraphy, which has been established through the entire drill core based on 120 closely spaced samples, shows a somewhat subdued development of the middle Darriwilian Isotope Carbon Excursion (MDICE), which is dated in terms of graptolite biostratigraphy. The Fågelsång isotope curve is correlated with a closely similar δ13Ccarb curve from a coeval, apparently stratigraphically essentially continuous, succession at Kårgärde in south-central Sweden, which previously has been subdivided into 13 conodont zones and subzones. For the first time, these conodont zonal units can be calibrated with Fågelsång graptolite zones using δ13Corg chemostratigraphy. The several new results of this study are expected to be useful for assessing biostratigraphic relations between units in shale and carbonate facies in Baltoscandia and elsewhere in the world.
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| 6. |
- Lundberg, Frans
(författare)
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Maximum Entropy Matching: An Approach to Fast Template Matching
- 2000
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- One important problem in image analysis is the localization of a template in a larger image. Applications where the solution of this problem can be used include: tracking, optical flow, and stereo vision. The matching method studied here solve this problem by defining a new similarity measurement between a template and an image neighborhood. This similarity is computed for all possible integer positions of the template within the image. The position for which we get the highest similarity is considered to be the match. The similarity is not necessarily computed using the original pixel values directly, but can of course be derived from higher level image features.The similarity measurement can be computed in differentways and the simplest approach are correlation-type algorithms. Aschwanden and Guggenb¨uhl [2] have done a comparison between such algorithms. One of best and simplest algorithms they tested is normalized cross-correlation (NCC). Therefore this algorithm has been used to compare with the PAIRS algorithm that is developed by the author and described in this text. It uses a completely different similarity measurement based on sets of bits extracted from the template and the image.This work is done withinWITAS which is a project dealing with UAV’s (unmanned aerial vehicles). Two specific applications of the developed template matching algorithm have been studied.One application is tracking of cars in video sequences from a helicopter.The other one is computing optical flow in such video sequences in order to detect moving objects, especially vehicles on roads.The video from the helicopter is in color (RGB) and this fact is used in the presented tracking algorithm. The PAIRS algorithm have been applied to these two applications and the results are reported.A part of this text will concern a general approach to template matching called Maximum Entropy Matching (MEM) that is developed here. The main idea of MEM is that the more data we compare on a computer the longer it takes and therefore the data that we compare should have maximum average information, that is, maximum entropy. We will see that this approach can be useful to create template matching algorithms which are in the order of 10 times faster then correlation (NCC) without decreasing the performance.
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| 7. |
- Maletz, Jörg, et al.
(författare)
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Ordovician graptolite biostratigraphy of the Röstånga-2 drill core (Scania, southern Sweden)
- 2020
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Ingår i: GFF. - : Informa UK Limited. - 1103-5897 .- 2000-0863. ; 142:3, s. 206-222
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Tidskriftsartikel (refereegranskat)abstract
- The graptolite biostratigraphy of the 116.11-m-long Röstånga-2 drill core from Scania, southern Sweden, includes the Darriwilian (Middle Ordovician) Holmograptus lentus, Nicholsonograptus fasciculatus, Pterograptus elegans, Pseudamplexograptus distichus and Jiangxigraptus vagus biozones, and the lower Sandbian (Upper Ordovician) Nemagraptus gracilis Biozone. The early Darriwilian Komstad Limestone was not reached. The succession includes numerous levels of brecciated rocks and slickensides, suggesting considerable tectonic deformation and possible gaps. The boundary between the Almelund Shale Formation (below) and the Sularp Shale Formation (above) has been identified at 19.55–19.70 m, where the Fågelsång Phosphorite Bed has been identified tentatively in the Jiangxigraptus vagus Biozone. The first specimens of Nemagraptus gracilis appear higher in the succession. The international correlation of the Darriwilian graptolite succession is discussed.
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| 8. |
- Thorlund, Jonas Bloch, et al.
(författare)
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Opioid dispensing in relation to arthroscopic knee surgery in Denmark from 2006 to 2018
- 2023
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Ingår i: Danish Medical Journal. - 2245-1919. ; 70:9
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Tidskriftsartikel (refereegranskat)abstract
- INTRODUCTION. In the US, opioids are commonly prescribed after arthroscopic knee surgery. We aimed to investigate opioid dispensing in relation to arthroscopic knee surgeries from 2006 to 2018 in Denmark. METHODS. In Danish registries, we identified patients (≥ 15 years old) having arthroscopic knee surgery (anterior cruciate ligament (ACL) reconstruction; meniscal surgery; cartilage resection; synovectomy and diagnostic arthroscopy) between 1 January 2006 and 31 December 2018 and opioid dispensing (oral morphine equivalents (OMEQ)) within seven days after discharge from surgery. RESULTS. Among 218,940 patients, 15,263 (7%) had an opioid dispensed within seven days after being discharged following surgery. The opioid dispensing incidence (per 1,000 persons/year) increased during the study period for all procedures. This trend was more pronounced for ACL reconstruction, which recorded an increase from 86 (95% confidence interval (CI): 75-99) in 2006 to 278 (95% CI: 255-301) in 2018, corresponding to 9% and 28% of ACL patients, respectively. In the same period, the average amount of opioids dispensed within the first seven days after discharge decreased (change: 70.0 OMEQ (95% CI: 12.4-127.5)). Tramadol and oxycodone were the most commonly dispensed opioids. CONCLUSION. About 7% of patients had an opioid dispensed within the first seven days after discharge following arthroscopic knee surgery. The incidence of opioids dispensed increased for all investigated procedures from 2006 to 2018. In the same period, the average amount of opioids dispensed within the first seven days after discharge decreased.
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