Browsing by Author "Lindell, Johan"

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A CONTINUED STRUCTURAL DOCUMENTATION OF THE GE1 DRILL CORE
(2022-09-05) Lindell, Johan; University of Gothenburg/Department of Earth Sciences; Göteborgs universitet/Institutionen för geovetenskaper
Gothenburg Energy, SGU, and Gothenburg University are investigating the possibility for geothermal energy plant in the Gothenburg area. A 1 km drill core were drilled in the Högsbo area and two bachelor thesis were written by Julia Ladefoged and Anna Hynynen about the first 550 m of the core. These theses discussed the structural and petrological aspects of the rock in the core. This thesis together with Glamheden (2022) has documented the structural and petrological aspects of the last 450 m. When comparing data from Ladefoged (2021) and the data collected for this thesis, a couple of foliation sets were found. The foliation sets from this thesis point towards the southwest, west, and southeast, with some measurements pointing south. Ladefoged (2021) two sets points towards northwest and southeast and north to south. Veins have an orientation towards southwest, northeast, north, and south with a varying dip between 20 – 40°. The number of veins is slowly increasing towards the end. Fractures have a very scattered orientation but have some stronger ones towards the southwest and northeast. Fractures and veins increase with depth while the rock strength decreases. This could be because of a nearby fault zone or an increase in cross-cutting fracture sets. Two hypotheses could be drawn from this research. One includes three deformation events spanning between the Gothian orogeny and the Caledonian orogeny, and one that only contains two deformation events spanning between the Gothian orogeny and the Sweconorwegian orogeny. Fieldwork was conducted at Änggårdsbergen in Gothenburg. The result showed that the area has an orientation towards the southwest and is gently plunging and steeply inclined. Comparing the field data with the data from the core show two possible scenarios. One scenario is that the area was created during the Sweconorwegian orogeny by rotating the folds from the Gothian orogeny by 108° anti-clockwise and got a 2° change in the plunge. This would lead to a broader set of fractures. The other scenario does the same as the first but rotates the position of the fold after the Sweconorwegian orogeny by 28° clockwise and got a 1° change in the plunge during the Caledonian orogeny leading to smaller sets of fractures. Three big fracture sets could be found throughout Änggårdsbergen with clar notation of 058/55, 240/55, and 137/90. However, more data is needed to draw any final conclusions about whether it is possible and suitable to build a geothermal plant in the Högsbo area.
Offshore Outsourcing – Betydande faktorer genom processen
(2005) Safiyari, Omid; Lindell, Johan; Göteborgs universitet/Institutionen för informatik
En allt högre global konkurrens har tvingat organisationer till omstruktureringar för att effektivisera sina interna processer. Detta har även satt sina spår på organisationers IT-försörjning vilket medfört att organisationer idag söker nya möjligheter att effektivisera sin försörjning av IT. I detta avseende har offshore outsourcing kommit fram som ett attraktivt alternativ. Det finns dock en stor komplexitet och många risker förknippad med offshore outsourcing vilket kräver stor medvetenhet om faktorer som kan påverka processen relaterad till denna företeelse. Syftet med denna studie har varit att kartlägga betydande faktorer relaterade till offshore outsourcing samt undersöka en möjlig modell för att stödja processen relaterad till fenomenet. Efter en omfattande teoretisk studie och en empirisk fallstudie baserad på sex intervjuer har denna studie lyft fram och beskrivit betydande faktorer relaterade till offshore outsourcingprocessen samt åskådigtgjort dessa i en vägledande modell.
Skarn units in the Leveäniemi and Gruvberget mines An overview of the skarns in Svappavaara, northern Sweden
(2024-12-16) Lindell, Johan; University of Gothenburg/Department of Earth Sciences; Göteborgs universitet/Institutionen för geovetenskaper
Skarns have been investigated a lot worldwide and are used as a common term for calc-silicate-rich rock with associated minerals, usually connected to some sort of mineralization. In Sweden, the term usually is used a bit more freely and as a term for waste rock or side rock around mineralization. In this thesis, the definition of skarns by Varela and Mannelqvist (2023) and Meinert (1992) will be used. LKAB is one of Sweden's biggest mining companies, owning three big mines in northern Sweden, mining iron from magnetite and skarns of different kinds can be found in these mines. However, even if LKAB knows about the different skarn types, there has been very little to no deeper investigation of these rock types in Gruvberget and Leveäniemi in the Svappavaara mining area. With the use of LA-ICP-MS and SEM, information about the Sr-isotopes in the minerals found in the skarn samples and trace elements in magnetite located in the different skarns has been gathered. With this information, together with logging data from LKAB, this thesis has tried to find connections and relations between the different skarns and if they also have any connection with the main mineralization. 5 different skarn types are being investigated in this thesis. The skarns are Actinolite skarn (Ask), Limestone skarn (Lsk), Albite altered skarn (Alb), Skarn (SKA) and Anthophyllite skarn (Ant). The results from the discrimination diagram from Ovalle, J. T. (2018) shows that the Svappavaara main mineralization (Sample 19.2 Mag) was formed during higher temperatures than the Kiruna field and that the magnetite samples were all (except sample 13 Ask) formed during moderate temperatures of 300 – 500 °C. However, discrimination diagrams should be seen as a pointer and not solid facts. The samples nearest to the main mineralization has 87Sr/86Sr ratio values similar to 87Sr/86Sr ratio values found when magnetite is forming. Samples that are further away has an increase in 87Sr/86Sr ratio values. The theory is that the Sr in the surrounding rocks of the deposit has been leeched and transported further away, increasingly precipitating as the temperatures, pH and chemistry of the fluid changes. If this trend and theory is correct, then finding skarns with a low 87Sr/86Sr ration could mean that an iron mineralization are close by, where the ratio would determine the distance to the ore. A new skarn type may have been discovered. The Diopside skarn (Dsk) has a clearer matrix which represents a carbonate-rich parent rock, compared to the Ask, where the protolith usually is completely altered beyond recognition. Also, the Dsk usually has another appearance than the Ask, lighter in colour and more carbonates visible on the core. Sample 1, 2, 3, 9, 10, 12, 13, 15, 18.1, 18.2, are, with the data collected in this project, skarns. Sample 19.1 Ant could be one, but there is too little information to be able to decide that in this thesis.
Utveckling av OLAP med Stjärnschema
(2010-09-24) Lindell, Johan; IT-universitetet i Göteborg/Tillämpad informationsteknologi; IT University of Gothenburg /Applied Information Technology
Syfte: Att utifrån utvalda scenarios identifiera vilka möjliga effekter som användandet av OLAP kan leda till. Genom en diskussion om nyttan med OLAP, efter att ha presenterat de scenarios som uppkom efter fallstudien, ge läsaren en ökad förståelse över hur olika brancher kan dra nytta av OLAP i deras respektive områden och visa hur kraftfullt OLAP kan vara för organisationer och verksamheter. Forskningsfråga: Vilka möjliga effekter kan OLAP tillföra i en verksamhet? Metod: En kvalitativ metod kallad fallstudie antogs till denna studie då ett antal scenarios arbetades fram. Datainsamlingen skedde med hjälp av en kvalitativ metod. Teori: Kapitlet inleds med en förklaring till OLAP och dess komponenter. Här förklaras OLAP, datalager, data mining, datakvalité, datalagrets datastruktur, stjärnschema, samt snöflingeschema. Resultat: Ett antal scenarios arbetades fram med utgångspunkt från existerande verksamheter och samhällssektorer. Stjärnschema, faktatabeller, dataexempel samt avslutningsvis SQL-frågor baserade på dessa stjärnscheman presenteras i detta avsnitt. Slutsats: Effekterna som OLAP tillförde varierade beroende på vilken branch som OLAP nyttjades i. Så länge som verksamheterna utnyttjade sina fördelar så medförde OLAP nytta till respektive verksamhet.