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Visar resultat 1 - 5 av 146 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. Hunting Hydrogen : Structure-property relations in High Entropy Alloy-based metal hydrides

    Författare :Gustav Ek; Martin Sahlberg; Ulrich Häussermann; William I.F. David; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Hydrogen; metal-hydride; High Entropy Alloy; Chemistry with specialization in Inorganic Chemistry; Kemi med inriktning mot oorganisk kemi;

    Sammanfattning : Metal hydrides have many uses when switching the energy system from fossil fuels to renewable sources, such as rechargeable batteries, hydrogen storage, hydrogen compression and thermal storage. State of the art materials for these applications such as LaNi5 and TiFe, however, suffer certain limitations such as degradation during repeated hydrogen cycling and harsh activation conditions for initial hydrogen uptake, promoting the need for novel materials. LÄS MER

  3. 2. Microphysical Properties of Snow Crystals Using Ground-Based In-Situ Instrumentation : Hunting Snowflakes

    Författare :Sandra Vázquez Martín; Thomas Kuhn; Salomon Eliasson; Sandra Yuter; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Atmosfärsvetenskap; Atmospheric science;

    Sammanfattning : Understanding what happens to hydrometeors, such as atmospheric snow particles (ice crystals, snow crystals, and snowflakes) in clouds is crucial for improving meteorolog-ical forecast and climate models. Consequently, improved predictions of the precipitation amount reaching the ground (snowfall) require accurate knowledge of the microphysical properties of ice crystals, such as their size, cross-sectional area, shape, fall speed, and mass. LÄS MER

  4. 3. Sirkas : ett samiskt fångstsamhälle i förändring Kr.f.-1600 e.Kr

    Författare :Inga-Maria Mulk; Umeå universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; Sámi; sijdda; northern Sweden; hunting-fishing; reindeer hunting; fur trade; early Iron Age; late Iron Age; medieval time; settlement pattern; seasonal mobility; intensification; hearths; stállo-sites; sacrificial sites; hunting pits; food storage; domestic social space;

    Sammanfattning : The dissertation is an investigation of Sirkas-sijdda, a Sámi hunting society in the interior of northern Sweden in the period AD 1-1600. The principal sources are historical evidence for the period around 1600, which saw the beginnings of colonial settlement and reindeer pastoralism, and for the earlier period archaeological data from excavations. LÄS MER

  5. 4. Firearm deaths in Sweden : epidemiology with emphasis on accidental deaths and prevention

    Författare :Mensura Junuzovic; Anders Eriksson; Patrik Midlöv; Louis Riddez; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Firearm; fatality; accidental; hunting; non-hunting; suicide; homicide; Forensic Medicine; rättsmedicin;

    Sammanfattning : Prevention of firearm deaths and injuries is an important public health issue that may save human lives. The aim of this thesis was to investigate the epidemiology and attributes of accidental firearm fatalities in Sweden, and to provide a basis for further preventive measures. LÄS MER

  7. 5. The use of stone and hunting of reindeer : a study of stone tool manufacture and hunting of large mammals in the central Scandes c. 6000-1 BC

    Författare :Lena Holm; Umeå universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; High mountains; hunter-gatherers; use of resources; stone tool manufacture; reindeer hunting; landscape use; seasonality;

    Sammanfattning : The thesis raises questions concerning prehistoric conditions in a high mountain region in central Scandinavia; it focuses on the human use of stone and on hunting principally of reindeer. An analysis of how the stone material was utilized and an approach to how large mammals were hunted result in a synthesis describing one interpretation of how the vast landscape of a region in the central Scandinavian high mountains was used. LÄS MER