825 results on '"Karlsson, Andreas"'
Search Results
2. Exploring Physical Education Teachers' Perceptions and Attitudes towards Digital Technology in Outdoor Education
- Author
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Isgren Karlsson, Andreas, Alatalo, Tarja, Nyberg, Gunn, and Backman, Erik
- Abstract
In the Swedish educational system, there has been a recent push for digital technology in different school subjects. This paper investigates what regulates Swedish physical education teachers' perceptions of digital technology in outdoor education. The results is reflected in a number of rules that govern Swedish physical education teachers' perceptions and use of digital technology in outdoor education. Findings suggest that teachers' views on the relevance of digital technology in outdoor education depends partly on curriculum formulations, but of significant importance are also other factors such as: the addressed knowledge area, grade level, choice of digital device, needs of students, and teachers' ideological beliefs. These rules are discussed in relation to the construction of outdoor education as knowledge area within physical education and in relation to the ways in which Swedish physical education teachers relate to curriculum changes.
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- 2023
- Full Text
- View/download PDF
3. Environmental Sustainability in Physical Education
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Karlsson, Andreas Isgren, primary and Backman, Erik, additional
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- 2023
- Full Text
- View/download PDF
4. Anatomy of a fumarole field: drone remote-sensing and petrological approaches reveal the degassing and alteration structure at La Fossa cone, Vulcano, Italy.
- Author
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Müller, Daniel, Walter, Thomas R., Troll, Valentin R., Stammeier, Jessica, Karlsson, Andreas, de Paolo, Erica, Pisciotta, Antonino Fabio, Zimmer, Martin, and De Jarnatt, Benjamin
- Subjects
IMAGE recognition (Computer vision) ,HYDROTHERMAL alteration ,PRINCIPAL components analysis ,HYDROTHERMAL deposits ,ROCK permeability - Abstract
Hydrothermal alteration and mineralization processes can affect the physical and chemical properties of volcanic rocks. Aggressive acidic degassing and fluid flow often also lead to changes in the appearance of a rock, such as changes in surface coloration or intense bleaching. Although hydrothermal alteration can have far-reaching consequences for rock stability and permeability, limited knowledge exists on the detailed structures, extent, and dynamic changes that take place near the surface of hydrothermal venting systems. By integrating drone-based photogrammetry with mineralogical and chemical analyses of rock samples and surface gas flux, we investigate the structure of the evolving volcanic degassing and alteration system at the La Fossa cone on the island of Vulcano, Italy. Our image analysis combines principal component analysis (PCA) with image classification and thermal analysis through which we identify an area of approximately 70 000 m2 that outlines the maximum extent of hydrothermal alteration effects at the surface, represented by a shift in rock color from reddish to gray. Within this area, we identify distinct gradients of surface coloration and temperature that indicate a local variability in the degassing and alteration intensity and define several structural units within the fumarole field. At least seven such larger units of increased activity could be constrained. Through mineralogical and geochemical analysis of samples from the different alteration units, we define a relationship between surface appearance in drone imagery and the mineralogical and chemical composition. Gradients in surface color from reddish to gray correlate with a reduction in Fe2O3 from up to 3.2 % in the unaltered regime to 0.3 % in the altered regime, and the latter coincides with the area of increased diffuse acid gas flux. As the pixel brightness increases towards higher alteration gradients, we note a loss of the initial (igneous) mineral fraction and a change in the bulk chemical composition with a concomitant increase in sulfur content from close to 0 % in the unaltered samples to up to 60 % in samples from the altered domains. Using this approach of combined remote-sensing and in situ analyses, we define and spatially constrain several alteration units and compare them to the present-day thermally active surface and degassing pattern over the main crater area. The combined results permit us to present a detailed anatomy of the La Fossa fumarole field, including high-temperature fumaroles and seven larger units of increased alteration intensity, surface temperature, and variably intense surface degassing. Importantly, we also identify apparently sealed surface domains that prevent degassing, likely as a consequence of mineral precipitation from degassing and alteration processes. By assessing the thermal energy release of the identified spatial units quantitatively, we show that thermal radiation of high-temperature fumaroles accounts for < 50 % of the total thermal energy release only and that the larger part is emitted by diffuse degassing units. The integrated use of methods presented here has proven to be a useful combination for a detailed characterization of alteration and activity patterns of volcanic degassing sites and has the potential for application in alteration research and for the monitoring of volcanic degassing systems. [ABSTRACT FROM AUTHOR]
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- 2024
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- View/download PDF
5. Cost-Effectiveness of Magnetic Resonance Imaging in Prostate Cancer Screening: A Microsimulation Study
- Author
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Hao, Shuang, Karlsson, Andreas, Heintz, Emelie, Elfström, K. Miriam, Nordström, Tobias, and Clements, Mark
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- 2021
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- View/download PDF
6. Differences in decompression of a high-pressure unit: A case study from the Cycladic Blueschist Unit on Naxos Island, Greece
- Author
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Peillod, Alexandre, Majka, Jarosław, Ring, Uwe, Drüppel, Kirsten, Patten, Clifford, Karlsson, Andreas, Włodek, Adam, and Tehler, Elof
- Published
- 2021
- Full Text
- View/download PDF
7. Uranium Repartitioning during Microbial Driven Reductive Transformation of U(VI)-Sorbed Schwertmannite and Jarosite
- Author
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Yu, Changxun, Johnson, Anders, Karlsson, Andreas, Chernikov, Roman, Sjöberg, Viktor, Song, Zhaoliang, Dopson, Mark, and Åström, Mats E.
- Abstract
This study exposes U(VI)-sorbed schwertmannite and jarosite to biotic reductive incubations under field-relevant conditions and examines the changes in aqueous and solid-phase speciation of U, Fe, and S as well as associated microbial communities over 180 days. The chemical, X-ray absorption spectroscopy, X-ray diffraction, and microscopic data demonstrated that the U(VI)-sorbed schwertmannite underwent a rapid reductive dissolution and solid-phase transformation to goethite, during which the surface-sorbed U(VI) was partly reduced and mostly repartitioned to monomeric U(VI)/U(IV) complexes by carboxyl and phosphoryl ligands on biomass or organic substances. Furthermore, the microbial data suggest that these processes were likely driven by the consecutive developments of fermentative and sulfate- and iron- reducing microbial communities. In contrast, the U(VI)-sorbed jarosite only stimulated the growth of some fermentative communities and underwent very limited reductive dissolution and thus, remaining in its initial state with no detectable mineralogical transformation and solid-phase U reduction/repartitioning. Accordingly, these two biotic incubations did not induce increased risk of U reliberation to the aqueous phase. These findings have important implications for understanding the interactions of schwertmannite/jarosite with microbial communities and colinked behavior and fate of U following the establishment of reducing conditions in various acidic and U-rich settings.
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- 2024
- Full Text
- View/download PDF
8. Biosignatures of ancient microbial life are present across the igneous crust of the Fennoscandian shield
- Author
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Drake, Henrik, Roberts, Nick M. W., Reinhardt, Manuel, Whitehouse, Martin, Ivarsson, Magnus, Karlsson, Andreas, Kooijman, Ellen, and Kielman-Schmitt, Melanie
- Published
- 2021
- Full Text
- View/download PDF
9. Igelströmite, Fe3+(Sb3+Pb2+)O4, and manganoschafarzikite, Mn2+Sb23+O4, two new members of the newly established minium group, from the Långban Mn–Fe deposit, Värmland, Sweden.
- Author
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Holtstam, Dan, Langhof, Jörgen, Friis, Henrik, Karlsson, Andreas, and Erambert, Muriel
- Subjects
CHEMICAL formulas ,COMPOUND fractures ,SPACE groups ,BARITE ,RUTILE ,HEMATITE ,CRYSTAL structure - Abstract
The two new minerals igelströmite, Fe 3+ (Sb 3+ Pb 2+)O 4 , and manganoschafarzikite, Mn 2+ Sb 23+ O 4 , are found in the Långban Fe–Mn deposit, in open fractures in a fine-grained hematite ore, with minor amounts of aegirine, a serpentine-group mineral, fluorcalcioroméite, baryte, nadorite, mimetite and other late-stage minerals. Igelströmite is named after the Swedish geologist–mineralogist Lars Johan Igelström (1822–1897). Mohs hardness = 3–4 and Dcalc= 6.33(1) and 5.37(2) g cm -3 for igelströmite and manganoschafarzikite, respectively. Cleavage is distinct on {110}. Both minerals are brittle, with an uneven to conchoidal fracture. The chemical formulae obtained from microprobe data are (Fe 0.593+ Mn 0.292+ As 0.063+ Fe 0.062+)Σ=1.00 (Sb 1.243+ Pb 0.652+ As 0.113+)Σ=2.00 O 4 and (Mn 0.642+ Fe 0.252+ Mg 0.08)Σ=0.97 (Sb 1.973+ As 0.033+ Pb 0.012+)Σ=2.01 O 4. The crystal structures for igelströmite and manganoschafarzikite have been refined in space group P 4 2 /mbc from single-crystal X-ray diffraction data to R 1 = 3.73 % and 1.51 %, respectively, giving the following sets of unit-cell parameters: a= 8.4856(2), 8.65159(8) Å; c= 6.0450(3), 5.97175(9); and V= 435.27(3), 446.986(11) Å 3 for Z = 4. Both minerals are isostructural with minium, Pb 4+ Pb 22+ O 4 , where Pb 4+ O 6 forms distorted octahedra, which connect via trans-edges to form rutile-like ribbons along c. The Pb 2+ atoms appear in trigonal, flattened PbO 3 pyramids, which are linked via corners to form zigzag (PbO 2)n chains. The minium group, of general formula MX2 O 4 (X= As 3+ , Sb 3+ , Pb 2+), presently consists of the minerals minium, trippkeite, schafarzikite, igelströmite and manganoschafarzikite. For future new members, it is recommended to consider the X cation content for the root name and add prefixes to indicate the dominant metal at the M position. [ABSTRACT FROM AUTHOR]
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- 2024
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10. Description and recognition of potassic-richterite, an amphibole supergroup mineral from the Pajsberg ore field, Värmland, Sweden
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Holtstam, Dan, Cámara, Fernando, Skogby, Henrik, Karlsson, Andreas, and Langhof, Jörgen
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- 2019
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11. Crystal Structure of Naphthalene Dioxygenase: Side-on Binding of Dioxygen to Iron
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Karlsson, Andreas, Parales, Juanito V., Parales, Rebecca E., Gibson, David T., Eklund, Hans, and Ramaswamy, S.
- Published
- 2003
12. Nulägesanalys om gymnasieelevers kunskap och förhållningssätt kring IT-säkerhet och hur lärare undervisar inom ämnet
- Author
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Karlsson, Andreas, Brifelt, Linus, Karlsson, Andreas, and Brifelt, Linus
- Abstract
Ungdomar börjar använda internet vid allt yngre åldrar: 99 % av ungdomar i åldersspannet 8 till 19 år använder internet på en daglig basis. Samtidigt som informationsflödet ökar så medför detta även bieffekter där ungdomar numera i allt större utsträckning sparar och laddar upp information om sig själva mer frekvent på internet. Samtidigt som användandet ökat privat har även många skolor i Sverige valt att nästan helt övergå från penna och papper till en mer digitaliserad utbildningsmetod. Detta har dock fört med sig vissa risker när det kommer till IT-säkerhet. Exempel på sådana risker kan vara obehörig åtkomst till data, dataintrång eller förlust av information på grund av tekniska fel eller bristfälliga säkerhetsåtgärder. Detta blev extra tydligt under covid-19-pandemin då utbildning övergick till distansundervisning samtidigt som cyberbrotten ökade i allmänhet, och mot utbildningssektorn i synnerhet. Denna studie har till syfte att undersöka kunskapsnivån och förhållningssätt hos tredjeårselever på gymnasieskolor runt om i Skaraborg inom området IT-säkerhet och samtidigt kartlägga behovet och intresset för utbildning inom ämnet. Studien har med hjälp av enkätundersökningar mot elever och semistrukturerade intervjuer med lärare kommit fram till att det finns ett tydligt behov av utbildning inom IT-säkerhet bland ungdomar på gymnasieskolorna i Skaraborg, samtidigt som lärarna menar på att ämnet ofta faller undan i klassrummet. Resultatet visar att både elever och lärare ser positivt på att inkludera ämnet i ordinarie gymnasieutbildning för att stärka kunskaper och medvetenhet om IT-säkerhetens betydelse., Young people are starting to use the internet at increasingly younger ages, with 99 % of individuals aged 8 to 19 using the internet on a daily basis. As the flow of information increases, this also brings about side effects where young people are now more frequently saving and uploading personal information about themselves on the internet. Moreover, as schools in Sweden have chosen to almost completely transition from pen and paper to a more digitized form of education, the need for IT security skills among young people has become increasingly important. This became particularly evident during the covid-19 pandemic when education shifted to remote learning and cybercrimes saw a general increase, particularly attacks against the education sector. The purpose of this study was to examine the level of knowledge and attitudes among third[1]year students in high schools across Skaraborg regarding IT security and simultaneously assess the need and interest for education around this subject. Through surveys conducted among students and semi-structured interviews with teachers, the study concludes that there is a clear need for education in IT security among young people in high schools in Skaraborg, while teachers argue that the subject often takes a back seat in the classroom. The results show that both students and teachers view the inclusion of this subject in regular high school education positively to strengthen knowledge and awareness of the importance of IT security.
- Published
- 2023
13. STUDY OF DISTRIBUTED/FEDERATED LEARNING APPROACHES WITH RANDOM FOREST FOR SENSOR FAILURE DETECTION IN MANUFACTURING ENVIRONMENT
- Author
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Karlsson, Andreas and Karlsson, Andreas
- Abstract
In a manufacturing environment, the continuous operation of production lines is of most importance to ensure optimal productivity and profitability. To maintain efficiency and safety, production lines often rely on systems that utilize data from sensors placed around the manufacturing process. These sensors provide valuable information about various parameters, such as temperature, pressure, and volume, which are critical for monitoring and controlling the equipment. However, if these sensors fail and report incorrect data to the system, it can lead to people being hurt, and cause damage to the machines and the product. It is therefor critical that sensor failures are detected before an accident happens. Machine learning is highly capable of detecting anomalies in sensor data. The problem is that it requires all the data to be centralized to make a prediction. An alternative is to use Distributed Learning (DL) or Federated Learning (FL) approach, which overcomes the limitations of traditional machine learning. DL and FL enables multiple clients to train on data subsets, and send the model parameters to the server for aggregation, minimizing the data needed to be sent. This paper addresses which DL or FL approaches, and which machine learning algorithm can be used together to detect sensor anomalies in data. The Random Forest machine learning algorithm is selected for its proven usability in detecting anomalies in machine learning. Random Forest is evaluated on an dataset called Modular Ice cream factory Dataset on Anomalies in Sensor (MIDAS) in combination with two distributed approaches: horizontal FL and vertical DL. In the experiments, the horizontal FL server achieves a slightly lower accuracy than the clients do. The vertical DL server performs better than all its clients, but its accuracy is lower than the horizontal FL server.
- Published
- 2023
14. A lithological context for stratabound REE mineralisation at the birthplace of REE – Bastnäs, Riddarhyttan, Sweden
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Dunst, Robert, Pitcairn, Iain, Raat, Hein, Jansson, Nils F., Karlsson, Andreas, Dunst, Robert, Pitcairn, Iain, Raat, Hein, Jansson, Nils F., and Karlsson, Andreas
- Abstract
The Bastnäs ore field, in central Sweden, is the cradle of the rare earth elements (REE). It is the place of the discovery of several REE and important REE-minerals (e.g., Bastnäsite one of the primary REE-ore minerals). In recent years there has been an increased interest due to rising demand of REE for technological applications. Several recent studies have focused on the mineralogy and geochemistry but a lack of fresh in situ samples has meant that textural and stratigraphic relationships are not as well described. Recent exploration in the area has produced drill core traverses across the host stratigraphy of the Bastnäs deposit, allowing the collection of relatively fresh in situ samples which can be placed in lithological context. Here we present new mineralogical and textural information linked to the lithology indicating that the REE-mineralisation in Bastnäs is commonly associated with magnetite skarn and that it occurs over a wide range of stratigraphic levels, ISBN for host publication: 978-2-8399-4046-7
- Published
- 2023
15. Cost-effectiveness models for Alzheimer's disease and related dementias:IPECAD modeling workshop cross-comparison challenge
- Author
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Handels, Ron L H, Green, Colin, Gustavsson, Anders, Herring, William L, Winblad, Bengt, Wimo, Anders, Sköldunger, Anders, Karlsson, Andreas, Anderson, Robert, Belger, Mark, Brück, Chiara, Espinosa, Robert, Hlávka, Jakub P, Jutkowitz, Eric, Lin, Pei-Jung, Mendez, Mauricio Lopez, Mar, Javier, Shewmaker, Peter, Spackman, Eldon, Tafazzoli, Ali, Tysinger, Bryan, Jönsson, Linus, Handels, Ron L H, Green, Colin, Gustavsson, Anders, Herring, William L, Winblad, Bengt, Wimo, Anders, Sköldunger, Anders, Karlsson, Andreas, Anderson, Robert, Belger, Mark, Brück, Chiara, Espinosa, Robert, Hlávka, Jakub P, Jutkowitz, Eric, Lin, Pei-Jung, Mendez, Mauricio Lopez, Mar, Javier, Shewmaker, Peter, Spackman, Eldon, Tafazzoli, Ali, Tysinger, Bryan, and Jönsson, Linus
- Abstract
INTRODUCTION: The credibility of model-based economic evaluations of Alzheimer's disease (AD) interventions is central to appropriate decision-making in a policy context. We report on the International PharmacoEconomic Collaboration on Alzheimer's Disease (IPECAD) Modeling Workshop Challenge.METHODS: Two common benchmark scenarios, for the hypothetical treatment of AD mild cognitive impairment (MCI) and mild dementia, were developed jointly by 29 participants. Model outcomes were summarized, and cross-comparisons were discussed during a structured workshop.RESULTS: A broad concordance was established among participants. Mean 10-year restricted survival and time in MCI in the control group ranged across 10 MCI models from 6.7 to 9.5 years and 3.4 to 5.6 years, respectively; and across 4 mild dementia models from 5.4 to 7.9 years (survival) and 1.5 to 4.2 years (mild dementia).DISCUSSION: The model comparison increased our understanding of methods, data used, and disease progression. We established a collaboration framework to assess cost-effectiveness outcomes, an important step toward transparent and credible AD models.
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- 2023
16. The petrology of Paleogene volcanism in the Central Sakarya, Nallıhan Region: Implications for the initiation and evolution of post-collisional, slab break-off-related magmatic activity
- Author
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Kasapoğlu, Bülent, Ersoy, Yalçın E., Uysal, İbrahim, Palmer, Martin R., Zack, Thomas, Koralay, Ersin O., and Karlsson, Andreas
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- 2016
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17. Vad händer med Svensk Kulturväxtdatabas (SKUD)?
- Author
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ALDÉN, BJÖRN, RYMAN, SVENGUNNAR, and KARLSSON, ANDREAS
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- 2024
18. High-spatial resolution dating of monazite and zircon reveals the timing of subduction–exhumation of the Vaimok Lens in the Seve Nappe Complex (Scandinavian Caledonides)
- Author
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Barnes, Christopher, Majka, Jarosław, Schneider, David, Walczak, Katarzyna, Bukała, Michał, Kośmińska, Karolina, Tokarski, Tomasz, and Karlsson, Andreas
- Published
- 2019
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19. Fluorbritholite-(Nd), Ca2Nd3(SiO4)3F, a new and key mineral for neodymium sequestration in REE skarns.
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Holtstam, Dan, Casey, Patrick, Bindi, Luca, Förster, Hans-Jürgen, Karlsson, Andreas, and Appelt, Oona
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- 2023
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20. Drone and field-based monitoring of the degassing and alteration structures of the La Fossa fumarole field (Vulcano Island), before and during the 2021 volcanic crisis
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Müller, Daniel, primary, Walter, Thomas R., additional, Troll, Valentin, additional, Stammeier, Jessica A., additional, Karlsson, Andreas, additional, De Paolo, Erica, additional, and Pisciotta, Antonino Fabio, additional
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- 2023
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21. New Reference Materials, Analytical Procedures and Data Reduction Strategies for Sr Isotope Measurements in Geological Materials by LA‐MC‐ICP‐MS
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Mulder, Jacob, primary, Hagen‐Peter, Graham, additional, Ubide, Teresa, additional, Andreasen, Rasmus, additional, Kooijman, Ellen, additional, Kielman‐Schmitt, Melanie, additional, Feng, Yue‐Xing, additional, Paul, Bence, additional, Karlsson, Andreas, additional, Tegner, Christian, additional, Lesher, Charles, additional, and Costa, Fidel, additional
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- 2023
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22. Disruption of a high-pressure unit during exhumation: petrology and geochronology within the Cycladic Blueschist Unit (Thera, Ios and Naxos islands, Greece)
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Peillod, Alexandre, primary, Patten, Clifford, additional, Drueppel, Kirsten, additional, Beranoaguirre, Aratz, additional, Zeh, Armin, additional, Gudelius, Dominik, additional, Hector, Simon, additional, Majka, Jaroslaw, additional, Kleine, Barbara, additional, Karlsson, Andreas, additional, Gerdes, Axel, additional, and Kolb, Jochen, additional
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- 2023
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23. Analysis of the current situation regarding high school students' knowledge and attitudes towards IT security, as well as how teachers are teaching the subject
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Karlsson, Andreas and Brifelt, Linus
- Subjects
Systemvetenskap, informationssystem och informatik med samhällsvetenskaplig inriktning ,education ,teachers ,cybersecurity ,students ,school ,lärare ,Information Systems, Social aspects ,IT security ,utbildning ,cybersäkerhet ,IT-säkerhet ,skola ,elever - Abstract
Ungdomar börjar använda internet vid allt yngre åldrar: 99 % av ungdomar i åldersspannet 8 till 19 år använder internet på en daglig basis. Samtidigt som informationsflödet ökar så medför detta även bieffekter där ungdomar numera i allt större utsträckning sparar och laddar upp information om sig själva mer frekvent på internet. Samtidigt som användandet ökat privat har även många skolor i Sverige valt att nästan helt övergå från penna och papper till en mer digitaliserad utbildningsmetod. Detta har dock fört med sig vissa risker när det kommer till IT-säkerhet. Exempel på sådana risker kan vara obehörig åtkomst till data, dataintrång eller förlust av information på grund av tekniska fel eller bristfälliga säkerhetsåtgärder. Detta blev extra tydligt under covid-19-pandemin då utbildning övergick till distansundervisning samtidigt som cyberbrotten ökade i allmänhet, och mot utbildningssektorn i synnerhet. Denna studie har till syfte att undersöka kunskapsnivån och förhållningssätt hos tredjeårselever på gymnasieskolor runt om i Skaraborg inom området IT-säkerhet och samtidigt kartlägga behovet och intresset för utbildning inom ämnet. Studien har med hjälp av enkätundersökningar mot elever och semistrukturerade intervjuer med lärare kommit fram till att det finns ett tydligt behov av utbildning inom IT-säkerhet bland ungdomar på gymnasieskolorna i Skaraborg, samtidigt som lärarna menar på att ämnet ofta faller undan i klassrummet. Resultatet visar att både elever och lärare ser positivt på att inkludera ämnet i ordinarie gymnasieutbildning för att stärka kunskaper och medvetenhet om IT-säkerhetens betydelse. Young people are starting to use the internet at increasingly younger ages, with 99 % of individuals aged 8 to 19 using the internet on a daily basis. As the flow of information increases, this also brings about side effects where young people are now more frequently saving and uploading personal information about themselves on the internet. Moreover, as schools in Sweden have chosen to almost completely transition from pen and paper to a more digitized form of education, the need for IT security skills among young people has become increasingly important. This became particularly evident during the covid-19 pandemic when education shifted to remote learning and cybercrimes saw a general increase, particularly attacks against the education sector. The purpose of this study was to examine the level of knowledge and attitudes among third[1]year students in high schools across Skaraborg regarding IT security and simultaneously assess the need and interest for education around this subject. Through surveys conducted among students and semi-structured interviews with teachers, the study concludes that there is a clear need for education in IT security among young people in high schools in Skaraborg, while teachers argue that the subject often takes a back seat in the classroom. The results show that both students and teachers view the inclusion of this subject in regular high school education positively to strengthen knowledge and awareness of the importance of IT security.
- Published
- 2023
24. New reference materials, analytical procedures, and data reduction strategies for Sr isotope measurements in geological materials by LA-MC-ICP-MS
- Author
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Mulder, Jacob, primary, Hagen-Peter, Graham, additional, Ubide, Teresa, additional, Andreasen, Rasmus, additional, Kooijman, Ellen, additional, Schmitt, Melanie, additional, Feng, Yu-Xing, additional, Paul, Bence, additional, Karlsson, Andreas, additional, Tegner, Christian, additional, Lesher, Charles, additional, and Costa, Fidel, additional
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- 2022
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25. Ferri-taramite, a new member of the amphibole supergroup, from the Jakobsberg Mn–Fe deposit, Värmland, Sweden
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Holtstam, Dan, primary, Cámara, Fernando, additional, Karlsson, Andreas, additional, Skogby, Henrik, additional, and Zack, Thomas, additional
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- 2022
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26. Psychological factors in genital pain: The role of fear-avoidance, pain catastrophizing and anxiety sensitivity among women living in Sweden
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Thomtén, Johanna and Karlsson, Andreas
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- 2014
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27. Anatomy of a fumarole field; drone remote sensing and petrological approaches reveal the degassing and alteration structure at La Fossa cone, Vulcano Island, Italy.
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Müller, Daniel, Walter, Thomas R., Troll, Valentin R., Stammeier, Jessica, Karlsson, Andreas, Paolo, Erica De, Pisciotta, Antonino Fabio, Zimmer, Martin, and Jarnatt, Benjamin De
- Subjects
REMOTE sensing ,FRACTIONS ,ROCK permeability ,HYDROTHERMAL alteration ,ROCK properties ,ANATOMY - Abstract
Hydrothermal alteration processes can affect the physical and chemical properties of volcanic rocks and develop via complex degassing and fluid flow systems and regimes. Although alteration can have far-reaching consequences for rock stability and permeability, little is known about the detailed structures, extent, and dynamic changes that take place in hydrothermal venting systems. By combining drone-based remote sensing with mineralogical and chemical analyses of rock and gas samples, we analyzed the structure and internal anatomy of a dynamic evolving volcanic degassing and alteration system at the La Fossa cone, Vulcano Island (Italy). From drone image analysis, we revealed a ~70,000 m
2 sized area subject to hydrothermal activity, for which we could determine distinct alteration gradients. By mineralogical and geochemical sampling of the zones of those alteration gradients, we study the relation between surface coloration and mineralogical and chemical composition. With increasing pixel brightness towards higher alteration gradients, we find a loss of initial mineral fraction and bulk chemical composition and a simultaneous gain in sulfur content. Using this approach, we defined and spatially constrained alteration units and compared them to the present-day thermally active surface and degassing pattern. The combined results permit us to present a detailed anatomy of the La Fossa fumarole field, highlighting 7 major units of alteration and present-day diffuse activity that, next to the high-temperature fumaroles, significantly contribute to the total activity. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
28. Exploring physical education teachers’ perceptions and attitudes towards digital technology in outdoor education
- Author
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Isgren Karlsson, Andreas, Alatalo, Tarja, Nyberg, Gunn, Backman, Erik, Isgren Karlsson, Andreas, Alatalo, Tarja, Nyberg, Gunn, and Backman, Erik
- Abstract
In the Swedish educational system, there has been a recent push for digital technology in different school subjects. This paper investigates what regulates Swedish physical education teachers’ perceptions of digital technology in outdoor education. The results is reflected in a number of rules that govern Swedish physical education teachers’ perceptions and use of digital technology in outdoor education. Findings suggest that teachers’ views on the relevance of digital technology in outdoor education depends partly on curriculum formulations, but of significant importance are also other factors such as: the addressed knowledge area, grade level, choice of digital device, needs of students, and teachers’ ideological beliefs. These rules are discussed in relation to the construction of outdoor education as knowledge area within physical education and in relation to the ways in which Swedish physical education teachers relate to curriculum changes.
- Published
- 2022
- Full Text
- View/download PDF
29. The relationship between attitudes to homelessness and perceptions of caring behaviours : a cross-sectional study among women experiencing homelessness, nurses and nursing students
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Gaber, Sophie, Karlsson, Andreas, Mattsson, Elisabet, Klarare, Anna, Gaber, Sophie, Karlsson, Andreas, Mattsson, Elisabet, and Klarare, Anna
- Abstract
Background Women experiencing homelessness have complex and multifaceted healthcare needs and yet they are an underserved population across healthcare services. Nurses are trained to perform an integral role in the provision of equitable healthcare and their attitudes towards homelessness may therefore influence the care that women experiencing homelessness receive. This study aimed to examine correlations between attitudes towards homelessness and caring behaviours, and to test if these correlations differed between the groups of women experiencing homelessness, registered nurses, and nursing students. Methods A cross-sectional design using convenience sampling was used to recruit women experiencing homelessness (n = 37), registered nurses (n = 90), and nursing students (n = 138) in Stockholm, Sweden between August 2019 and December 2020. The participants answered two questionnaires: the Attitudes Toward Homelessness Inventory and the Caring Behaviours Inventory-24. Correlations between ordinal variables were calculated using Spearman's rank correlation rho. Tests of equality between two independent correlations were performed using a Z-test applied to Fisher's z-transformed correlations. An advisory board of women with lived experience of homelessness supported the interpretation of the results. Results Weak, negative correlations were identified between the Attitudes Toward Homelessness Inventory and Caring Behaviours Inventory-24. The Attitudes Toward Homelessness Inventory mean total scores (SD) were 4.1 (0.6), 4.2 (0.6), 4.1 (0.5) points for the women experiencing homelessness, registered nurse, and nursing student groups, respectively, with the corresponding scores for the Caring Behaviours Inventory-24 being 4.1 (1.1), 5.2 (0.5), 4.8 (0.7) points, respectively. Conclusions To promote equitable health for women experiencing homelessness, healthcare providers and nurse educators should consider the role of stigmatising attitudes in relation to caring behaviour
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- 2022
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30. Associations between dietary advice on modified fibre and lactose intakes and nutrient intakes in men with prostate cancer undergoing radiotherapy
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Söderström, Lisa, Forslund, Marina, Johansson, Birgitta, Ottenblad, Anna, Karlsson, Andreas, Söderström, Lisa, Forslund, Marina, Johansson, Birgitta, Ottenblad, Anna, and Karlsson, Andreas
- Abstract
Objectives: A variety of non-evidence-based dietary advice on modified fibre and lactose intakes are provided to patients undergoing pelvic radiotherapy to counteract treatment-related bowel symptoms. More knowledge on the nutritional consequences of such advice is needed. This study aimed to explore how advice on modified fibre and lactose intakes during pelvic radiotherapy was associated with nutrient intakes amongst patients with prostate cancer. Methods: A total of 77 Swedish men who underwent radiotherapy (50/2 Gy + boost 20-30 Gy) in 20092014 due to prostate cancer were given dietary advice at radiotherapy onset (baseline) and at 4 and 8 weeks after radiotherapy onset, to modify their fibre and lactose intakes. At baseline, the participants completed a food frequency questionnaire (FFQ) and a 24-h dietary recall. At 4 and 8 weeks, the participants completed the FFQ and a 4-day estimated food record. Fibre and lactose intakes were measured by intake scores calculated from the FFQs. Multiple linear regression models were used to analyse associations between intake scores and fibre- and lactose-related nutrients. Results: In adjusted analyses, there were few significant associations between dietary advice on modified fibre and lactose intakes and observed intakes of fibre- and lactose-related nutrients. A more modified lactose intake was thus associated with a lower intake of calcium (P = 0.041), whilst a more modified fibre intake was associated with a higher value for the change in intake of vitamin C (P = 0.016). Conclusions: Dietary advice on modified fibre and lactose intake was in most cases not significantly associated with altered nutrient intakes, rather the energy and nutrient intakes were mostly stable during the pelvic radiotherapy. More research is needed on the nutritional consequences of dietary advice on modified fibre and lactose intakes to reach consensus on if they should continue to be provided in the clinic.
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- 2022
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31. Late Holocene peat paleodust deposition in south-western Sweden - exploring geochemical properties, local mineral sources and regional aeolian activity
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Sjöström, J.K., Bindler, R., Martínez Cortizas, A., Björck, S., Hansson, S.V., Karlsson, Andreas, Ellerton, D.T., Kylander, Malin, Sjöström, J.K., Bindler, R., Martínez Cortizas, A., Björck, S., Hansson, S.V., Karlsson, Andreas, Ellerton, D.T., and Kylander, Malin
- Abstract
Atmospheric mineral dust not only interacts with the climate system by scattering incoming solar radiation and affecting atmospheric photochemistry, but also contributes critical nutrients to marine and terrestrial ecosystems. In a high-resolution analysis of paleodust deposition, peat development and soil dust sources, we assess the interplay between dust deposition and bog development of the Davidsmosse bog in south-western Sweden. Analyses of the 5400-year record (458 cm) included radiocarbon dating, bulk density, ash content, chemical and mineralogical composition and carbon stable isotopes, subsequently explored using principal component analysis. Fourteen dust events (DEs) were recorded (cal BP) in the peat sequence: 3580–3490; 3280; 3140; 3010–2840; 2740; 2610; 2480; 2340; 2240–2130; 1690; 1240; 960, 890–760, and 620–360. The majority of the DEs were coupled to increases in peat accumulation rates and increased nutrient content (N, P and K) suggesting that the DEs contributed with nutrients to the bog ecosystem, promoting increased accumulation. We also analyzed the chemical and mineral composition of potential mineral source deposits (separated into 6 grain-size fractions) from sites within a 4 km radius as well as aeolian dunes closer to the coast (25 km). The composition deposited on the present-day bog surface indicates that the bulk of the contemporary minerals have a local origin (<1.5 km), but the DEs may be of a more distant origin. The results also indicate that quartz and plagioclase feldspar content consistently increase with increasing grain-size, both in the source samples as well as in the peat sequence, and that the Si/Al ratio can be used to infer grain size changes in the peat. Two longer phases saw numerous DEs, between 2800 and 2130 cal BP and a stepwise increase from 960 towards 360 cal BP. The episodic character of the events, together with the inferred coarse grain size, suggest that the particles were deposited by (winter) storms. Fu
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- 2022
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32. Old samples - new amphiboles
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Cámara, Fernando, Holtstam, Dan, Karlsson, Andreas, Skogby, Henrik, Cámara, Fernando, Holtstam, Dan, Karlsson, Andreas, and Skogby, Henrik
- Abstract
The scientific value of old and well-preserved collections is priceless. Samples that already have been studied and described can still give very useful information. For instance, minerals with complex solid solutions like amphiboles sometimes show new compositions that are feasible because of crystal-chemistry and charge arrangements, based on the current classification scheme by Hawthorne et al. (2012) for the amphibole supergroup. In the last four years, a fruitful collaboration between the Swedish Museum of Natural History and the Department of Earth Sciences of the University of Milan has allowed the identification of new amphibole species, recognized by CNMNC-IMA. First of all, we identified hjalmarite, [ANaB(NaMn)CMg5TSi8O22W(OH)2], which is related to richterite via the homovalent substitution [B]Ca2+ → [B]Mn2+, and is the second recognized member of the sodium–(magnesium–iron–manganese) subgroup, after ferri-ghoseite. Sjögren (1891) had described a physically similar, MnO-rich sample from Långban, named “astochit”. A related amphibole, although belonging to a different subgroup, that we have formally described is potassic-richterite, [AKB(NaCa)CMg5TSi8O22W(OH)2]. It was found in a sample from the Pajsberg iron and manganese ore mines, which was originally collected by the mineralogist Lars Johan Igelström, probably in the 1850s. The most recent amphibole we have described is ferri-taramite [ANaB(NaCa)C(Mg3Fe3+2)T(Si6Al2)O22W(OH)2], found in a skarn sample from the Jakobsberg manganese mine: it was once examined by Flink (1914), who noted the unusual character of the amphibole and described it as a “strange hornblende”.
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- 2022
33. Avståndet till kollektivtrafiken samt befolkningstäthetens påverkan på bostadspriser
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Karlsson, Andreas and Karlsson, Andreas
- Abstract
Rapporten undersöker hur bostadspriser påverkas av avståndet till kollektivtrafiken och sambandet det har till befolkningstätheten i området. Sedan så är det just också hur detta skiljer sig rent teoretiskt och i praktiken som skiljer det här arbetet från andra liknande arbeten då det oftast endast ett av detta och dess påverkan ligger i fokus. Insamlingen av data till arbetet har sket via den kvalitativ metod som avser att med hjälp av intervjuer, arkivdata och teorier som är anpassningsbara för att uppfylla syftet och besvara frågeställningen. Det finns några olika modeller och teorier som används som grund rent teoretiskt vid detta problem. Men stor skillnad mellan teorin och praktiken framkom snabbt då intervjuerna började då de flesta ej aktivt använde de modeller som kunde förklara avståndet till kollektivtrafikens påverkan samt befolkningstäthetens påverkan på bostadspriserna men i praktiken använde sig värderarna av marknadskännedom och ortsprismetoden vid nästan alla värderingar då de flesta ansågs att det räckte med dessa metoder för att värdera bostäder. Men så rent teoretiskt så finns det ett samband mellan avståndet till kollektivtrafiken och befolkningstäthet och det har oftast en positiv påverkan på bostadspriser men kan variera beroende på fler olika variabler som kan förekomma från fall till fall. Sedan så genom de fem intervjuer har empiriska data erhållits för att kunna koppla teorin till verkligheten. De fem respondenterna diskuterade först ifall sambandet fanns men även problematik med det, de flesta respondenter höll med att i praktiken finns det ett vist samband men att det var svårt att kvantifiera men att det ej är direkt och enbart mellan avståndet till kollektivtrafiken och befolkningstätheten då detta endast är två faktorer av väldigt många flera som påverkas tillsammans och förbättras oftast i liknande takt i följd av att det ställs högre krav och att ett område blir mer attraktivt att leva i. Slutligen så i praktiken behövs det i nuläge, The report examines how the housing prices get affected by the distance to public transport and the relationship it has with the population density in the area. Then it is precisely how this differs purely theoretically and in practice that separates this work from other similar work, since usually only one of this factors and its impact is in focus. The collection of data for the work has taken place via the qualitative method which intends to use interviews, archival data and theories that are adaptable to fulfil the purpose and answer the question. There are a few different models and theories that are used as a theoretical basis for this problem. But a big difference between theory and practice quickly emerged when the interviews began, as most did not actively use the models that could explain the impact the distance to public transport and the impact of population density on housing prices, but in practice the valuers used market knowledge and the local price method for almost all valuations as most considered that these methods were sufficient to value housing. But purely theoretically, there is a connection between the distance to public transport and population density, and this usually has a positive impact on housing prices but can vary depending on several different variables that can occur from case to case. Then through the five interviews, empirical data has been obtained to be able to connect the theory to reality. The five respondents first discussed whether the connection existed but also problems with it, most respondents agreed that in practice there is a certain connection but that it was difficult to quantify but that it is not directly and only between the distance to public transport and the population density as this are only two factors out of many that are affected together and usually improve at a similar rate as a result of higher demands being made and an area becoming more attractive to live in. Finally, in practice, there is currently
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- 2022
34. E-Science technologies in a workflow for personalized medicine using cancer screening as a case study
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Spjuth, Ola, Karlsson, Andreas, Clements, Mark, Humphreys, Keith, Ivansson, Emma, Dowling, Jim, Eklund, Martin, Jauhiainen, Alexandra, Czene, Kamila, Grönberg, Henrik, Sparén, Pär, Wiklund, Fredrik, Cheddad, Abbas, Pálsdóttir, þorgerður, Rantalainen, Mattias, Abrahamsson, Linda, Laure, Erwin, Litton, Jan-Eric, and Palmgren, Juni
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- 2017
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35. Cost‐effectiveness models for Alzheimer's disease and related dementias: IPECAD modeling workshop cross‐comparison challenge.
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Handels, Ron L.H., Green, Colin, Gustavsson, Anders, Herring, William L., Winblad, Bengt, Wimo, Anders, Sköldunger, Anders, Karlsson, Andreas, Anderson, Robert, Belger, Mark, Brück, Chiara, Espinosa, Robert, Hlávka, Jakub P., Jutkowitz, Eric, Lin, Pei‐Jung, Mendez, Mauricio Lopez, Mar, Javier, Shewmaker, Peter, Spackman, Eldon, and Tafazzoli, Ali
- Abstract
Introduction: The credibility of model‐based economic evaluations of Alzheimer's disease (AD) interventions is central to appropriate decision‐making in a policy context. We report on the International PharmacoEconomic Collaboration on Alzheimer's Disease (IPECAD) Modeling Workshop Challenge. Methods: Two common benchmark scenarios, for the hypothetical treatment of AD mild cognitive impairment (MCI) and mild dementia, were developed jointly by 29 participants. Model outcomes were summarized, and cross‐comparisons were discussed during a structured workshop. Results: A broad concordance was established among participants. Mean 10‐year restricted survival and time in MCI in the control group ranged across 10 MCI models from 6.7 to 9.5 years and 3.4 to 5.6 years, respectively; and across 4 mild dementia models from 5.4 to 7.9 years (survival) and 1.5 to 4.2 years (mild dementia). Discussion: The model comparison increased our understanding of methods, data used, and disease progression. We established a collaboration framework to assess cost‐effectiveness outcomes, an important step toward transparent and credible AD models. [ABSTRACT FROM AUTHOR]
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- 2023
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36. Exploring physical education teachers’ perceptions and attitudes towards digital technology in outdoor education
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Isgren Karlsson, Andreas, primary, Alatalo, Tarja, additional, Nyberg, Gunn, additional, and Backman, Erik, additional
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- 2022
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37. Adding complexity to the garnet supergroup: monteneveite, Ca3Sb5+2(Fe3+2Fe2+)O12, a new mineral from the Monteneve mine, Bolzano Province, Italy
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Karlsson, Andreas, Holtstam, Dan, Bindi, Luca, Bonazzi, Paola, and Konrad-Schmolke, Matthias
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Mineralogy ,QE351-399.2 - Abstract
Monteneveite, ideally Ca3Sb25+(Fe23+Fe2+)O12, is a new member of the garnet supergroup (IMA 2018-060). The mineral was discovered in a small specimen belonging to the Swedish Museum of Natural History coming from the now abandoned Monteneve Pb–Zn mine in Passiria Valley, Bolzano Province, Alto Adige (South Tyrol), Italy. The specimen consists of mainly magnetite, sphalerite, tetrahedrite-(Fe) and oxycalcioroméite. Monteneveite occurs as black, subhedral crystals with adamantine lustre. They are equidimensional and up to 400 µm in size, with a subconchoidal fracture. Monteneveite is opaque, grey in reflected light, and isotropic under crossed polars. Measured reflectance values (%) at the four COM wavelengths are 12.6 (470 nm), 12.0 (546 nm), 11.6 (589 nm) and 11.4 (650 nm). The Vickers hardness (VHN100) is 1141 kg mm−2, corresponding to H=6.5–7, and the calculated density is 4.72(1) g cm−3. A mean of 10 electron microprobe analyses gave (wt %) CaO 23.67, FeO 3.75, Fe2O3 29.54, Sb2O5 39.81, SnO2 2.22, ZnO 2.29, MgO 0.15, MnO 0.03 and CoO 0.03. The crystal chemical formula calculated on the basis of a total of eight cations and 12 anions, and taking into account the available structural and spectroscopic data, is (Ca2.97Mg0.03)Σ=3.00 (Sb1.735+Sn0.104+Fe0.173+)Σ=2.00(Fe2.433+Fe0.372+Zn0.20)Σ=3.00O12. The most significant chemical variations encountered in the sample are related to a substitution of the type YSn4++ZFe3+→YSb5++ZFe2+. Mössbauer data obtained at RT and 77 K indicate the presence of tetrahedrally coordinated Fe2+. Raman spectroscopy demonstrates that there is no measurable hydrogarnet component in monteneveite. The six strongest Bragg peaks in the powder X-ray diffraction pattern are [d (Å), I (%), (hkl)]: 4.45, 100, (220); 3.147, 60, (400); 2.814, 40, (420); 2.571, 80, (422); 1.993, 40, (620); 1.683, 60, (642). Monteneveite is cubic, space group Ia-3‾d, with a=12.6093(2) Å, V=2004.8(1) Å3, and Z=8. The crystal structure was refined up to R1=0.0197 for 305 reflections with Fo>4σ(Fo) and 19 parameters. Monteneveite is related to the other Ca-, Sb- and Fe-bearing, nominally Si-free members of the bitikleite group, but it differs in that it is the only known garnet species with mixed trivalent and divalent cations (2:1) at the tetrahedral Z site. Textural and mineralogical evidence suggests that monteneveite formed during peak metamorphism (at ca. 600 ∘C) during partial breakdown of tetrahedrite-(Fe) by reactions with carbonate, under relatively oxidizing conditions. The mineral is named after the type locality, the Monteneve (Schneeberg) mine.
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- 2020
38. Preliminary data on sulphides at Kiruna, Sweden
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Andersson, Ulf B, Kalmbach, Jana, Gilbricht, Sabine, Seifert, Thomas, Karlsson, Andreas, and Krolop, Patrick
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- 2022
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39. The Distance to Public Transport and the Population Densities Influence on Housing Prices
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Karlsson, Andreas
- Subjects
Fastigheter ,befolkningstäthet ,bostadspriser ,Public transport ,Housing prices ,kollektivtrafik ,Real estate ,population density ,Civil Engineering ,Samhällsbyggnadsteknik - Abstract
Rapporten undersöker hur bostadspriser påverkas av avståndet till kollektivtrafiken och sambandet det har till befolkningstätheten i området. Sedan så är det just också hur detta skiljer sig rent teoretiskt och i praktiken som skiljer det här arbetet från andra liknande arbeten då det oftast endast ett av detta och dess påverkan ligger i fokus. Insamlingen av data till arbetet har sket via den kvalitativ metod som avser att med hjälp av intervjuer, arkivdata och teorier som är anpassningsbara för att uppfylla syftet och besvara frågeställningen. Det finns några olika modeller och teorier som används som grund rent teoretiskt vid detta problem. Men stor skillnad mellan teorin och praktiken framkom snabbt då intervjuerna började då de flesta ej aktivt använde de modeller som kunde förklara avståndet till kollektivtrafikens påverkan samt befolkningstäthetens påverkan på bostadspriserna men i praktiken använde sig värderarna av marknadskännedom och ortsprismetoden vid nästan alla värderingar då de flesta ansågs att det räckte med dessa metoder för att värdera bostäder. Men så rent teoretiskt så finns det ett samband mellan avståndet till kollektivtrafiken och befolkningstäthet och det har oftast en positiv påverkan på bostadspriser men kan variera beroende på fler olika variabler som kan förekomma från fall till fall. Sedan så genom de fem intervjuer har empiriska data erhållits för att kunna koppla teorin till verkligheten. De fem respondenterna diskuterade först ifall sambandet fanns men även problematik med det, de flesta respondenter höll med att i praktiken finns det ett vist samband men att det var svårt att kvantifiera men att det ej är direkt och enbart mellan avståndet till kollektivtrafiken och befolkningstätheten då detta endast är två faktorer av väldigt många flera som påverkas tillsammans och förbättras oftast i liknande takt i följd av att det ställs högre krav och att ett område blir mer attraktivt att leva i. Slutligen så i praktiken behövs det i nuläget ej några nya modeller eller teorier för att kunna värdera bostäder med vikt på avståndet till kollektivtrafiken och befolkningstätheten, men att ifall dessa faktorer blir väldigt eftertraktade och attraktiva kan nya analyser och studier behövas göras för att marknaden ska kunna dra slutsatser om hur mycket dessa faktorer påverkar bostadspriserna. The report examines how the housing prices get affected by the distance to public transport and the relationship it has with the population density in the area. Then it is precisely how this differs purely theoretically and in practice that separates this work from other similar work, since usually only one of this factors and its impact is in focus. The collection of data for the work has taken place via the qualitative method which intends to use interviews, archival data and theories that are adaptable to fulfil the purpose and answer the question. There are a few different models and theories that are used as a theoretical basis for this problem. But a big difference between theory and practice quickly emerged when the interviews began, as most did not actively use the models that could explain the impact the distance to public transport and the impact of population density on housing prices, but in practice the valuers used market knowledge and the local price method for almost all valuations as most considered that these methods were sufficient to value housing. But purely theoretically, there is a connection between the distance to public transport and population density, and this usually has a positive impact on housing prices but can vary depending on several different variables that can occur from case to case. Then through the five interviews, empirical data has been obtained to be able to connect the theory to reality. The five respondents first discussed whether the connection existed but also problems with it, most respondents agreed that in practice there is a certain connection but that it was difficult to quantify but that it is not directly and only between the distance to public transport and the population density as this are only two factors out of many that are affected together and usually improve at a similar rate as a result of higher demands being made and an area becoming more attractive to live in. Finally, in practice, there is currently no need for new models or theories to be able to value housing with weight on the distance to public transport and the population density, but that if these factors become very sought after and attractive, new analyses and studies may need to be done so that the market can draw conclusions about how much these factors affect house prices.
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- 2022
40. Auroral Phenomenology and Magnetospheric Processes: Earth and Other Planets
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Andreas Keiling, Eric Donovan, Fran Bagenal, Tomas Karlsson, Andreas Keiling, Eric Donovan, Fran Bagenal, Tomas Karlsson
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- 2013
41. Garpenbergite, Mn6□As5+Sb5+O10(OH)2, a new mineral related to manganostibite, from the Garpenberg Zn–Pb–Ag deposit, Sweden
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Holtstam, Dan, primary, Bindi, Luca, additional, Förster, Hans-Jürgen, additional, Karlsson, Andreas, additional, and Gatedal, Kjell, additional
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- 2022
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42. Study of the Dissolution of Stainless-Steel Slag Minerals in Different Acid Environments to Promote Their Use for the Treatment of Acidic Wastewaters
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De Colle, Mattia, primary, Kielman, Ross, additional, Karlsson, Andreas, additional, Karasev, Andrey, additional, and Jönsson, Pär G., additional
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- 2021
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43. Zinkgruvanite, Ba4Mn2+4Fe3+2(Si2O7)2(SO4)2O2(OH)2, a new ericssonite-group mineral from the Zinkgruvan Zn-Pb-Ag-Cu deposit, Askersund, Örebro County, Sweden
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Cámara, Fernando, primary, Holtstam, Dan, additional, Jansson, Nils, additional, Jonsson, Erik, additional, Karlsson, Andreas, additional, Langhof, Jörgen, additional, Majka, Jaroslaw, additional, and Zetterqvist, Anders, additional
- Published
- 2021
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44. The reliability of cardiogenic impedance and correlation with echocardiographic and plethysmographic parameters for predicting CRT time intervals post implantation
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Sciaraffia, Elena, Ginks, Matthew R., Gustafsson, John, Karlsson, Andreas, Rinaldi, C. Aldo, and Lundqvist, Carina Blomström
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- 2013
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45. Towards the manufacturing enterprises of the future
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Vinodrai Pandya, K., Karlsson, Andreas, Sega, Stefano, and Carrie, A.
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- 1997
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46. Differences in decompression of the high-pressure Cycladic Blueschist Unit (Naxos Island, Greece): what can inclusions tell us?
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Peillod , Alexandre, Majka , Jarosław, Ring , Uwe, Drüppel , Kirsten, Patten , Clifford, Karlsson , Andreas, Włodek , Adam, and Tehler , Elof
- Abstract
Determining the tectonic evolution and thermal structure of a tectonic unit that experiences a subduction-related pressure temperature (P-T) loop is challenging. Within a single unit, P-T conditions can vary from top to bottom which can be only revealed by detailed petrological work. We present micropetrological data of the middle section of the Cycladic Blueschist Unit (CBU) in Naxos, Greece, which indicate a different P-T loop than the top of the section. In the middle section, strong deformation associated with high-T metamorphism erases most of the earlier tectonometamorphic imprints preventing to apply "traditional" geothermobarometry methods. Using Zr-in-rutile and Ti-in-biotite thermometry coupled with quartz-in-garnet elastic barometry and phase equilibrium thermodynamic modeling, we identify a prograde path from ~15.4 kbar to ~19.9 kbar and from ~496 °C to ~572 °C, equilibration during decompression at ~8.3 kbar and ~519 °C followed by near-isobaric heating to ~9.2 kbar and ~550 °C (or even ~584 °C), and a final greenschist-facies equilibration stage at ~3.8 kbar and ~520 °C. We compare these P-T estimates with published data from the top of the CBU section and find that the bottom half of the CBU on Naxos records higher peak high-pressure (HP) of about 4 kbar than the top, defining the thickness of the CBU to about 15 km in the Eocene. We determine that crustal thickening of up to ~15% occurs in the upper half of the CBU section during exhumation of the HP rocks in an extrusion wedge during convergence.
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- 2021
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47. Zinkgruvanite, Ba4Mn2+4Fe3+2(Si2O7)2(SO4)2O2(OH)2, a new ericssonite-group mineral from the Zinkgruvan Zn-Pb-Ag-Cu deposit, Askersund, orebro County, Sweden
- Author
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Cámara, Fernando, Holtstam, Dan, Jansson, Nils, Jonsson, Erik, Karlsson, Andreas, Langhof, Jörgen, Majka, Jaroslaw, and Zetterqvist, Anders
- Subjects
skarn ,Geology ,Geokemi ,barium mineralization ,ericssonite ,ericssonite group ,Geochemistry ,Zinkgruvan ,ferro-ericssonite ,yoshimuraite ,Geologi ,new mineral ,mineral nomenclature ,Zinkgruvanite - Abstract
Zinkgruvanite, ideally Ba4Mn42+Fe23+(Si2O7)2(SO4)2O2(OH)2, is a new member of the ericssonite group, found in Ba-rich drill core samples from a sphalerite- and galena- and diopside-rich metatuffite succession from the Zinkgruvan mine, Örebro County, Sweden. Zinkgruvanite is associated with massive baryte, barytocalcite, diopside and minor witherite, cerchiaraite-Al, and sulfide minerals. It occurs as subhedral to euhedral flattened and elongated crystals up to 4 mm. It is almost black and semi-opaque with a dark-brown streak. The lustre is vitreous to sub-adamantine on crystal faces and resinous on fractures. The mineral is brittle with an uneven fracture. VHN100=539, and HMohs ≈ 4.5. In thin fragments, it is reddish-black, translucent and optically biaxial (+), 2Vz > 70∘. Pleochroism is strong and deep brown-red (E ⊥ {001} cleavage) to olive-pale-brown. Chemical point analyses by WDS-EPMA (wavelength-dispersive X-ray spectroscopy electron probe microanalyser) together with iron valencies determined from Mössbauer spectroscopy yielded the empirical formula (based on 26 O+OH+F+Cl anions): (Ba4.02Na0.03)Σ4.05(Mn1.79Fe1.562+Fe0.423+Mg0.14Ca0.10Ni0.01Zn0.01)Σ4.03(Fe1.743+Ti0.20Al0.06)Σ2.00Si4(S1.61Si0.32P0.07)Σ1.99O24(OH1.63Cl0.29F0.08)Σ2.00. The mineral is triclinic, in space group P1¯, with unit-cell parameters a=5.3982(1) Å, b=7.0237(1) Å, c=14.8108(4) Å, α= 98.256(2)∘, β= 93.379(2)∘, γ= 89.985(2)∘ and V= 554.75(2) Å3 for Z=1. The eight strongest X-ray powder diffraction lines are the following (d Å (I %; hkl)): 3.508 (70; 103), 2.980(70; 114‾), 2.814 (68; 12‾2), 2.777 (70; 121), 2.699 (714; 200), 2.680 (68; 201‾), 2.125 (100; 124, 204) and 2.107 (96; 2‾21). The crystal structure (R1=0.0379 for 3204 reflections) is an array of TS (titanium silicate) blocks alternating with intermediate blocks. The TS blocks consist of HOH sheets (H for heteropolyhedral and O for octahedral) parallel to (001). In the O sheet, the Mn2+-dominant MO(1,2,3) sites give ideally Mn42+ pfu (per formula unit). In the H sheet, the Fe3+-dominant MH sites and AP(1) sites give ideally Fe23+Ba2 pfu. In the intermediate block, SO4 oxyanions and 11 coordinated Ba atoms give ideally 2× SO4Ba pfu. Zinkgruvanite is related to ericssonite and ferroericssonite in having the same topology and type of linkage of layers in the TS block. Zinkgruvanite is also closely compositionally related to yoshimuraite, Ba4Mn4Ti2(Si2O7)2(PO4)2O2(OH)2, via the coupled heterovalent substitution 2 Ti4++ 2 (PO4)3-→2 Fe3++ 2 (SO4)2− but presents a different type of linkage. The new mineral probably formed during a late stage of regional metamorphism of a Ba-enriched, syngenetic protolith, involving locally generated oxidized fluids of high salinity.
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- 2021
48. Långban - a cornucopia for new mineral species?
- Author
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Langhof, Jörgen, Karlsson, Andreas, and Holtstam, Dan
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Sweden ,Geology ,Geologi ,minerals ,Långban - Published
- 2021
49. Can short sessions of resistance training twice daily during working hours effectively impact neck and shoulder pain in biomedical analysts : A pilot study
- Author
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Karlsson, Lisa and Karlsson, Andreas
- Subjects
skuldersmärta ,nacksmärta ,arbetsplatsintervention ,fysioterapi ,Sjukgymnastik ,Physiotherapy ,styrketräning - Abstract
Bakgrund: Arbetsrelaterad nack- och skuldersmärta är problematiskt både för arbetstagaren och arbetsgivaren. Denna smärta är vanligt förekommande vid statiska och/eller repetitiva arbetsmoment vilket ofta förekommer bland biomedicinska analytiker. Det finns viss evidens för att pauser med specifik styrketräning på arbetsplatsen kan påverka denna typ av smärta. Syfte: Att undersöka hur två korta styrketräningspass per dag kan påverka nack- och skuldersmärta hos de som arbetar på biomedicinskt laboratorium och hur implementering av fysisk aktivitet på arbetsplatsen fungerar. Metod: Biomedicinska analytiker (n=9) på Norrlands Universitetssjukhus genomförde under tre veckor ett kort styrketräningsprogram för nacke och skuldra två gånger per dag på arbetstid. Smärta mättes med 11-gradig NRS (medelvärde senaste veckan), och sexgradig Likertskala (medelvärde senaste tre veckorna) före och efter intervention. Implementeringen utvärderades genom grad av fullföljande. Resultat: Kliniskt signifikant minskning av smärta erhölls. Smärta mätt med NRS gick ned med 1,56 poäng från veckan innan till interventionens sista vecka (p=0,007). Smärta skattad på Likertskala gick också ned med en kliniskt signifikant skillnad (p=0,005). Fullföljandegraden blev i genomsnitt 77,3%, dock rapporterat av endast fyra av nio deltagare. Konklusion: Interventionen med korta styrketräningspass på arbetstid visade sig lyckad med en minskad smärta för deltagarna. Implementeringsmetoden fungerade väl baserat på den relativt höga graden fullföljande. Detta var dock en mindre pilot-studie och för mer kunskap behövs större studier med fler personer och helst en kontrollgrupp.
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- 2021
50. Translation, Cross-Cultural Adaptation, and Psychometric Analysis of the Attitudes Towards Homelessness Inventory for Use in Sweden
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Klarare, Anna, Wikman, Anna, Söderlund, Mona, McGreevy, Jenny, Mattsson, Elisabet, Karlsson, Andreas, Klarare, Anna, Wikman, Anna, Söderlund, Mona, McGreevy, Jenny, Mattsson, Elisabet, and Karlsson, Andreas
- Abstract
BACKGROUND: Homelessness is an increasing problem worldwide, and the origins of homelessness in high-income countries are multifaceted. Due to stigma and discrimination, persons in homelessness delay seeking health care, resulting in avoidable illness and death. The Attitudes Towards Homelessness Inventory (ATHI) was developed to cover multiple dimensions of attitudes toward persons in homelessness and to detect changes in multiple segments of populations. It has, however, not previously been translated to Swedish. AIMS: The aim of the present study was to translate, cross-culturally adapt, and psychometrically test the ATHI for use in a Swedish healthcare context. METHODS: The project used a traditional forward- and back-translation process in six stages: (1) two simultaneous translations by bilingual experts; (2) expert review committee synthesis; (3) blind back-translation; (4) expert review committee deliberations; (5) pre-testing with cognitive interviews including registered nurses (n = 5), nursing students (n = 5), and women in homelessness (n = 5); and (6) psychometric evaluations. The final ATHI questionnaire was answered by 228 registered nurses and nursing students in the year 2019. RESULTS: The translation process was systematically conducted and entailed discussions regarding semantic, idiomatic, experiential, and conceptual equivalence. Confirmatory factor analysis was used to examine if the collected data fitted the hypothesized four-factor structure of the ATHI. Overall, it was found that the model had an acceptable fit and that the Swedish version of ATHI may be used in a Swedish healthcare context. LINKING EVIDENCE TO ACTION: The ATHI has been shown to be a psychometrically acceptable research instrument for use in a Swedish healthcare context. The systematic and rigorous process applied in this study, including experts with diverse competencies in translation proceedings and testing, improved the reliability and validity of the final Swedish versi
- Published
- 2021
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