Sökning: "A-stability"

Visar resultat 26 - 30 av 34 avhandlingar innehållade ordet A-stability.

1. 26. Chiral Lithium N,P-amide Complexes. Synthesis, Applications and Structural Studies by NMR and DFT

   Författare :Petra Rönnholm; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; 6Li NMR; Asymmetric synthesis; N; P-ligands; DFT; Molecular mechanics;

   Sammanfattning : Enantiospecific synthesis reactions are of intense interest, owing to the increasing request for enantiopure compounds in both research and industry. Lithium amides containing a secondary chelating group are a class of powerful ligands for asymmetric addition reactions. LÄS MER

3. 27. The Dirac Equation: Numerical and Asymptotic Analysis

   Författare :Hasan Almanasreh; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Dirac operator; eigenvalue problem; finite element method; spurious eigenvalues; Petrov-Galerkin; cubic Hermite basis functions; stability parameter; meshfree method; $hp$-cloud; intrinsic enrichment; G-convergence; $ Gamma$-convergence; scattering theory; identification; wave operator; stationary approach; Dirac operator;

   Sammanfattning : The thesis consists of three parts, although each part belongs to a specific subject area in mathematics, they are considered as subfields of the perturbation theory. The main objective of the presented work is the study of the Dirac operator; the first part concerns the treatment of the spurious eigenvalues in the computation of the discrete spectrum. LÄS MER

4. 28. Analysis of dc-network stability of VSC-based HVDC grids

   Författare :Gustavo Pinares; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; power dependent admittance; resonance; HVDC; passivity; Multi-terminal HVDC system; VSC; dc-network stability;

   Sammanfattning : This thesis presents a modelling approach for the investigation of dc-network stability in HVDC grids. It consists on dividing the system under analysis into subsystems such that their individual impact on the stability of the overall system can be studied. LÄS MER

5. 29. Split Trees, Cuttings and Explosions

   Författare :Cecilia Holmgren; Svante Janson; Luc Devroye; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Random Graphs; Random Trees; Split Trees; Renewal Theory; Binary Search Trees; Cuttings; Records; Tree Algorithms; Markov Chains; Galton-Watson Processes; MATHEMATICS; MATEMATIK; Mathematics; Matematik;

   Sammanfattning : This thesis is based on four papers investigating properties of split trees and also introducing new methods for studying such trees. Split trees comprise a large class of random trees of logarithmic height and include e.g., binary search trees, m-ary search trees, quadtrees, median of (2k+1)-trees, simplex trees, tries and digital search trees. LÄS MER

7. 30. Ageing in a changing society : Elderly men and women in urban Sweden 1830-1930

   Författare :Ann-Kristin Högman; Lars-Göran Tedebrand; Umeå universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; class; demography; family; gender; labour force participation; living arrangements; modernisation; Norrköping; old age; poor relief; Stockholm; Sundsvall; Older people and ageing; Äldre och åldrande; Social welfare social pedagogics; Social omsorg socialpedagogik; Social anthropology; Socialantropologi; caring sciences in social sciences; omvårdnadsforskning med samhällsvetenskaplig inriktning;

   Sammanfattning : This study deals with the impact of industrialisation and urbanisation on the living conditions of aged men and women. By studying labour force participation, savings and pensions, the role of the family, and the extent of dependency of aged men and women from a gender and class perspective, continuities and changes between pre-industrial and industrial times are examined. LÄS MER