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Visar resultat 1 - 5 av 118 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Unraveling the importance of solid and adsorbed phase mercury speciation for methylmercury formation, evasion and bioaccumulation

   Författare :Sofi Jonsson; Erik Björn; Ulf Skyllberg; Erik Lundberg; Per Persson; Robert Mason; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; mercury; methylmercury; aquatic systems; estuary; Hg; MeHg; bioaccumulation; methylation; demethylation; evasion; sediment; water; terrestrial sources; atmospheric sources; climate change; eutrophication;

   Sammanfattning : Monomethylmercury, MeHg, is formed under anoxic conditions in waters, sediments and soils and then bioaccumulated and biomagnified in aquatic food webs, negatively effecting both human and wildlife health. It is generally accepted that precipitation of mercury, Hg, and adsorption of Hg to e.g. LÄS MER

3. 2. Essays on Pensions, Retirement and Tax Evasion

   Författare :Johannes Hagen; Sören Blomquist; Håkan Selin; Monika Bütler; Uppsala universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Pensions; retirement; annuity; annuity puzzle; adverse selection; pension reform; instrumental variable; health; health care; mortality; tax evasion; engel curves; consumption; self-employment; permanent income; Economics; Nationalekonomi;

   Sammanfattning : Essay I: This essay provides an overview of the history of the Swedish pension system. Starting with the implementation of the public pension system in 1913, it outlines the key components of each major pension reform up until today along with a discussion of the main trade-offs and concerns that policy makers have faced. LÄS MER

4. 3. Biophysical controls on CO2 evasion from Arctic inland waters

   Författare :Gerard Rocher-Ros; Reiner Giesler; Ryan A. Sponseller; Ann-Kristin Bergström; Paul del Giorgio; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Inland waters; carbon dioxide; organic carbon; inorganic carbon; arctic; CO2 evasion; DOC; DIC; streams; metabolism; oxygen; Limnology; limnologi;

   Sammanfattning : CO2 evasion to the atmosphere from inland waters is a major component of the global carbon (C) cycle. Yet spatial patterns of CO2 evasion and the sources of C that fuel evasion remain poorly understood. LÄS MER

5. 4. Essays in International Trade : Measurement, Product Quality, Input-Output Modelling and Tax Evasion

   Författare :Lars M Widell; Lars Lundberg; Lars Hultkrantz; Daniela Andrén; Joakim Gullstrand; Örebro universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Factor content of trade; human capital; vertical intra-industry trade; product quality; Input–output modelling; CTA; ITA; Tax Evasion; Africa; Economics; Nationalekonomi;

   Sammanfattning : This thesis consists of four independent essays that deal with several measurement aspects within the field of international trade. The measurement problems addressed are related to measuring the human capital content of trade in exports relative to imports or measuring tax evasionEssay 1, The Human Capital Content of Trade and its Measurement. LÄS MER

7. 5. Consensus and Pursuit-Evasion in Nonlinear Multi-Agent Systems

   Författare :Johan Thunberg; Xiaoming Hu; Zhong-Ping Jiang; KTH; []
   Nyckelord :Multi-agent systems; consensus; attitude synchronization; nonlinear control; optimization; pursuit-evasion;

   Sammanfattning : Within the field of multi-agent systems theory, we study the problems of consensus and pursuit-evasion. In our study of the consensus problem, we first provide some theoretical results and then consider the problem of consensus on SO(3) or attitude synchronization. LÄS MER