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Visar resultat 16 - 20 av 540 avhandlingar som matchar ovanstående sökkriterier.

1. 16. A Class of Renewal Processes in Random Environments

   Författare :David Svensson; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; point process; renewal process; random environment; coupling; regeneration; failure rate; Poisson embedding; asymptotics; stochastic domination; stochastic monotonicity; renewal process;

   Sammanfattning : This paper deals with a generalization of the class of renewal processes with absolutely continuous life length distribution, obtained by allowing a random environment to modulate the stochastic intensity of the renewal process. The random environment is a birth and death process with a finite state space. LÄS MER

3. 17. Asymmetric Synthesis and Mechanistic Studies on Copper(I)-Catalyzed Substitution of Allylic Substrates

   Författare :Jakob Norinder; Jan-Erling Bäckvall; Norbert Krause; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; copper; allylic substitution; ferrocene; DYKAT; cross-coupling; homo-coupling; DFT; Organic chemistry; Organisk kemi;

   Sammanfattning : This thesis deals with the copper-catalyzed substitution of allylic substrates.In the first part of this thesis, the synthesis of a series of metallocenethiolates is described. The thiolates were examined as ligands in the enantioselective copper(I)-catalyzed γ-substitution of allylic acetates. LÄS MER

4. 18. Two-Sex Branching Populations

   Författare :Ali Falahati; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; branching process; martingale; population dynamics; two-sex; bisexual; coupling method; martingale;

   Sammanfattning : We introduce a Two-Sex Galton-Watson Branching Process, to study the dynamics of two-sex populations. It allows individuals to interact with each other in order to form couples (or mating units), and each of these couples produces children for the new generation. LÄS MER

5. 19. Transition metal-catalyzed allylic and vinylic functionalization : Method development and mechanistic investigations

   Författare :Johanna M. Larsson; Kálmán J. Szabó; Dennis G. Hall; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; palladium; copper; catalysis; Heck reaction; C-H functionalization; allylic substitution; silylation; borylation; trifluoromethylation; fluorination; mechanistic study; transition metal; alkene; allylic silane; allylic boronate; allylic fluoride; organisk kemi; Organic Chemistry;

   Sammanfattning : The use of small molecule building blocks in, for example, pharmaceutical research and new material development, creates a need for new and improved organic synthesis methods. The use of transition metals as mediators and catalysts opens up new reaction pathways that have made the synthesis of completely new compounds possible as well as greatly improved the synthetic routes to known compounds. LÄS MER

7. 20. Fluxes and Mixing Processes in the Marine Atmospheric Boundary Layer

   Författare :Erik Olof Nilsson; Anna Rutgersson; Harm Jonker; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Waves; Growing sea; Swell; Marine boundary layer; Air-sea interaction; Mixing; Momentum flux; Wind stress; Flux attenuation; Sensor separation; Large eddy simulation; Multiresolution analysis; Coupling; Wave model; Climate model; Wave age; Meteorology; Meteorologi;

   Sammanfattning : Atmospheric models are strongly dependent on the turbulent exchange of momentum, sensible heat and moisture (latent heat) at the surface. Oceans cover about 70% of the Earth’s surface and understanding the processes that control air-sea exchange is of great importance in order to predict weather and climate. LÄS MER