754 research outputs found
Anders Kristian Munk on Anthropology in Business with Matt Artz
No full textIn this episode of the Anthropology in Business podcast, Anders Kristian Munk speaks with Matt Artz about his career as a business anthropologist. The conversation covers Ander’s journey from human geography to Techno-Anthropology.Anders Kristian Munk is an anthropologist, associate professor, and the director of The Techno-Anthropology Lab at Aalborg University in Copenhagen. He holds degrees in ethnology and human geography, with a PhD from the University of Oxford, and previously worked at the SciencesPo médialab in Paris and the Danish Technical University.He is the co-author of Controversy Mapping: A Field Guide, which introduces readers to the observation and representation of contested issues on digital media
2. Networks, states and empires in the Baltic Region
No full textMain author Kristian Gerner. Harald Runblom author of boxes on The Vikings and The Hansa.</p
Pegmatite petrogenesis and PT-calculations regarding the magmatic-hydrothermal-transition in Tørdal, SE Norway, compared to The Land's End Granite, SW England
No full textEtt 3 km langt belte bestående av 300 pegmatittkropper er lokalisert i Tørdal-Treungen granitten, SØ Norge. Denne oppgaven er ett bidrag til nylige ideer om deres petrogenese og den magmatisk-hydrotermale overgangen (Rosing-Schow et al., 2018b; Steffenssen et al., 2020). Dannelsesteorier av pegmatitter kompleks, men en akseptert modell foreslår at smelten stammer fra de meget differensierte, vannmettede delene av store granitt-intrusjoner. Rune Wilberg utførte en detaljert kartlegging rundt Kleppsvatnet, og identifiserte fem generasjoner, der den mest mineraliserende hendelsen med Sn-Mo mineraliseringer er knyttet til sluttfasene. En kort migreringsvei for den pegmatittiske smelten er også bemerket av feltobservasjoner. Begge disse faktorene bidrar til teorien om at pegmatittene er dannet direkte av anatektisk. Tilstedeværelsen av sjeldne jordartselementer (REE) er vanligvis assosiert med Nb-Y-Fe (NYF) pegmatitter. Tørdal-pegmatittene var imidlertid lenge definert som Li-Ce-Ta (LCT), til tross for sin berikelse av REE. En detaljert EPMA-kartlegging av en Nb-Rutil avslører en NYF affinitet, til tross for LCT kjennetegn. Dette støtter at pegmatittene klassifiseres som en mikset klasse.
En detaljert undersøkelse av de hydrotermale væskene ble også utført for å kunne forstå den magmatisk hydrotermale overgangen. For å oppnå dette ble SEM-CL bilder og variasjoner av Ti innholdet i både hydrotermal og magmatisk kvarts analysert. Basert på observasjoner av phyllic omvandlingsprodukter i optisk mikroskop, er ett system hvor sure væsker strømmer gjennom en kjøligere vertsbergart foreslått. Hydrolyse av feltspat endrer væskeegenskapene mot ett mer oksiderende system med økende pH, som forårsaket utfelling av de malmdannende mineralene. Mineralselskapet og omvandlingsproduktene passer godt med de beregnede trykk og temperaturforholdene. Temperaturene strekker seg fra 450 til 550 C med et trykk mellom 3,4-5,2 Kbar. Det ble beregnet basert på mikrotermometriske målinger av væske inneslutninger i kvarts og TitaniQ, fra den hydrotermale kvartsen.A 3 km wide belt comprising over 300 pegmatite bodies is emplaced in the Tørdal-Treungen granite, SE Norway (Rosing-Schow, Müller, & Friis, 2018b; Steffenssen et al., 2020). This thesis is a contribution regarding recent ideas of their petrogenesis and the magmatic-hydrothermal-transition. Rune Wilberg (1983) performed a detailed mapping around Kleppsvatnet, identifying five generations, where the most mineralizing events with Sn-Mo signatures occurred in the final phases. In a commonly accepted model are the pegmatitic melt derived from highest differentiated, water-saturated portions of the cupola zone in large granitic intrusions. Here are short travel distances of the pegmatitic-melt noted by field observations and both observations are contributing to the pegmatites being formed directly by anatectic (Rosing-Schow, 2020; Steffenssen et al., 2020). The presence of rare earth elements (REE) is usually associated with Nb-Y-Fe (NYF) pegmatites. However, the Tørdal-pegmatites was a long time defined as Li-Ce-Ta (LCT), despite its enrichments of REE. A detailed EPMA-mapping of an Nb-Rutile reveal NYF-affinity, despite LCT characteristics, and a mixed-class pegmatite system is supported.
A more detailed investigation of the hydrothermal veins is also performed, aiming to answer the magmatic-hydrothermal transition. To obtain this goal was SEM-CL photos and Ti-variations of both hydrothermal and magmatic quartz analysed. Observations of phyllic alteration products suggest a system of acidic fluids percolating through a cooler host-rock. Hydrolysis of feldspar moved the fluid properties towards oxidizing conditions and increasing pH, causing precipitation of the ore-forming minerals. The mineral assemblage and alteration products match the calculated pressure and temperature condition. Temperatures ranging from 450-550 C and a pressure of 3,4-5,2 Kb was calculated based on microthermometry from fluid inclusion measurements and TitaniQ, for the hydrothermal event
Pegmatite petrogenesis and PT-calculations regarding the magmatic-hydrothermal-transition in Tørdal, SE Norway, compared to The Land's End Granite, SW England
No full textEtt 3 km langt belte bestående av 300 pegmatittkropper er lokalisert i Tørdal-Treungen granitten, SØ Norge. Denne oppgaven er ett bidrag til nylige ideer om deres petrogenese og den magmatisk-hydrotermale overgangen (Rosing-Schow et al., 2018b; Steffenssen et al., 2020). Dannelsesteorier av pegmatitter kompleks, men en akseptert modell foreslår at smelten stammer fra de meget differensierte, vannmettede delene av store granitt-intrusjoner. Rune Wilberg utførte en detaljert kartlegging rundt Kleppsvatnet, og identifiserte fem generasjoner, der den mest mineraliserende hendelsen med Sn-Mo mineraliseringer er knyttet til sluttfasene. En kort migreringsvei for den pegmatittiske smelten er også bemerket av feltobservasjoner. Begge disse faktorene bidrar til teorien om at pegmatittene er dannet direkte av anatektisk. Tilstedeværelsen av sjeldne jordartselementer (REE) er vanligvis assosiert med Nb-Y-Fe (NYF) pegmatitter. Tørdal-pegmatittene var imidlertid lenge definert som Li-Ce-Ta (LCT), til tross for sin berikelse av REE. En detaljert EPMA-kartlegging av en Nb-Rutil avslører en NYF affinitet, til tross for LCT kjennetegn. Dette støtter at pegmatittene klassifiseres som en mikset klasse.
En detaljert undersøkelse av de hydrotermale væskene ble også utført for å kunne forstå den magmatisk hydrotermale overgangen. For å oppnå dette ble SEM-CL bilder og variasjoner av Ti innholdet i både hydrotermal og magmatisk kvarts analysert. Basert på observasjoner av phyllic omvandlingsprodukter i optisk mikroskop, er ett system hvor sure væsker strømmer gjennom en kjøligere vertsbergart foreslått. Hydrolyse av feltspat endrer væskeegenskapene mot ett mer oksiderende system med økende pH, som forårsaket utfelling av de malmdannende mineralene. Mineralselskapet og omvandlingsproduktene passer godt med de beregnede trykk og temperaturforholdene. Temperaturene strekker seg fra 450 til 550 C med et trykk mellom 3,4-5,2 Kbar. Det ble beregnet basert på mikrotermometriske målinger av væske inneslutninger i kvarts og TitaniQ, fra den hydrotermale kvartsen
Correction:Horizontal collaboration in the freight transport sector: barrier and decision-making frameworks (European Transport Research Review, (2021), 13, 1, (53), 10.1186/s12544-021-00512-3)
No full textFollowing the publication of the original article [1], it was noted that due to a typesetting error the author affiliation of the author Kristian Hegner Reinau is incorrect. The correct author affiliation is: Ahmed Karam1,2, Kristian Hegner Reinau1 and Christian Richter Østergaard31Department of the Built Environment, Aalborg University, Aalborg, Denmark 2Mechanical Engineering Department, Faculty of Engineering at Shoubra, Benha University, Cairo, Egypt 3Aalborg University Business School, Aalborg, Denmark The original article has been corrected.</p
The 5 Waves of Information Security – From Kristian Beckman to the Present
No full textInternational audienceThis paper gives an overview of the development of Information Security from the early 1980s up to the present time. The paper makes use of two papers by the author, Information Security - the Third Wave (von Solms, 2000) and Information Security - the Fourth Wave (von Solms, 2006), as well as a paper in preparation, Information Security - The Fifth Wave (von Solms, 2010). In the paper in 2000, the First Wave of Information Security was defined as lasting up to the early 1980s. In May 1983 the First International Conference on Information Security (IFIP/Sec 83) took place in Sweden, and was organized by Kristian Beckman. Kristian Beckman was subsequently elected as the first Chairperson of the newly created Technical Committee 11 of IFIP. He died in 1984. Kristian Beckman can therefore be seen to have lived during the First Wave of Information Security, which provides the motivation for the sub title of this paper
Platinum Group Element Mineralization in the Reinfjord Ultramafic Complex - A geochemical and petrological study of the PGE-enriched parts of the RF-4 drill core
No full textThe Reinfjord Ultramafic Complex (RUC), a part of the Seiland Igneous Province (SIP), is located in Nord-Troms, Norway. The RUC constitutes parts of deep seated magmatic conduit system that comprises a low tenor PGE-reef. In the RF-4 drill core, the reef is located at a depth of approximately 62 m, where the Pd+Pt concentration reaches around 0.8 ppm. This thesis places its emphasis on investigating the PGE mineralization of the RF-4 drill core, in order to obtain knowledge regarding the formation mechanisms of the reef. The thesis also compares the results with the mineralization found in the RF-1 drill core. Chemical data was provided by ICP spectrometry, SEM and EPMA, while preliminary investigations was done by optical microscopy.
The PGE host rock in RF-4 is a dunite, containing mostly olivine, with minor clinopyroxene and orthopyroxene. Interstitial carbonates and amphibole is also present. The RF-4 drill core revealed a wide variety of PGM's, where bismuthotellurides, arsenides and sulfurarsenides are the most common phases. Other phases comprise antimonides and PGE alloys. The PGM's are often BMS associated, where both pentlandite and pyrrhotite are common hosts. The presence of the PGE-arsenides-and sulfurarsenides, set the mineralization in RF-4 apart from that of RF-1. Possible scenarios explaining the differences in PGM assemblage are localized gain of As from surrounding rocks, removal by hydrothermal fluids or vertical displacement of As-rich zones due to tectonics.
The author suggest that the PGM's formed from sulfide fractionation, and the concentration process is thus magmatic. Further, the author propose the possibility of PGM's exsolving from an iss, due the PGM's often showing an affinity to Cu-rich pyrrhotite. PGM's can also be found associated with serpentine, sometimes showing remainders of BMS, indicating high degrees of serpentinization. Serpentinization is also responsible for the breakdown of chalcopyrite, leading to the formation of native Cu. Stability field calculations with constant bulk composition a.k.a a pesudosection was done for a mineral assemblage comprising amphibole, orthopyroxene, olivine and magnesite, which represents a secondary volatile phase. The model propose that re-mobilization of PGE and Au could happen at high P ( bar) and mid-to-high T ( K) conditions. Pd would be more soluble in the fluid compared to Pt, and the Pd-cluster in RF-1 could thus be the result of such processes
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