Sökning: "Martin Andersson"

Visar resultat 21 - 25 av 78 avhandlingar innehållade orden Martin Andersson.

  1. 21. Asthma in school age : prevalence, incidence and remission in relation to environmental determinants

    Författare :Martin Andersson; Eva Rönmark; Bertil Forsberg; Per Nafstad; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; asthma; wheeze; environment; prevalence; incidence; remission; vehicle traffic; sensitization; Occupational and Environmental Medicine; arbets- och miljömedicin;

    Sammanfattning : Background In the past half-century, the prevalence of asthma among children and adolescents has risen and asthma has become an important public health challenge in Sweden as well as in many other countries, necessitating further studies on this complex disease and its risk factor pattern. The studies included in this thesis aimed to investigate the clinical expression of childhood asthma over time, to describe the determinants of new-onset and remission of asthma, and to evaluate possible environmental risk factors in northern Sweden. LÄS MER

  3. 22. Microfluidics at High Pressures : Understanding, Sensing, and Control

    Författare :Martin Andersson; Lena Klintberg; Cyril Aymonier; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; High-pressure microfluidics; supercritical CO2; compressible flow; relative permittivity; integrated electrodes; Teknisk fysik med inriktning mot mikrosystemteknik; Engineering Science with specialization in Microsystems Technology;

    Sammanfattning : This thesis explores understanding, sensing, and control in high-pressure microfluidics. The high-pressure regime allows fluids to be forced through narrow channels at substantial speed and creates conditions for fluids of high density and low viscosity—features desired in flow-based chemical analyses. LÄS MER

  4. 23. Migration i 1600-talets Sverige : Älvsborgs lösen 1613–1618

    Författare :Martin Andersson; Heiko Droste; Maria Sjöberg; Patrick Svensson; Södertörns högskola; []
    Nyckelord :HUMANIORA; HUMANITIES; migration; migration regime; Sweden; feudal society; seventeenth century; Älvsborgs lösen; migration rate; migration distance; tenants; servants; forced migration; urban migration; Historical Studies; Historiska studier;

    Sammanfattning : This thesis is a study of migration in the early seventeenth-century Swedish feudal society, and of its migration regime; that is the political, legal and economic structures that shaped the migration patterns. The most important sources are taxation records from Älvsborgs lösen, containing demographic migration data for large parts of the Swedish realm 1613–1618. LÄS MER

  5. 24. Numerical Renormalization, Doped Antiferromagnets, and Statistics - Topics in Low Dimensional Physics

    Författare :Martin Andersson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Josephson junctions; matrix-product states; fictitious flux; phase-separation; renormalization; stripes; t-J model; anyons; DMRG;

    Sammanfattning : The first part of the thesis deals with so called numerical renormalization group methods, and in particular the density-matrix renormalization group (DMRG). This method performs extremely well for large one-dimensional quantum systems like spin-chains and Hubbard models. LÄS MER

  7. 25. Numerical renormalization group methods

    Författare :Martin Andersson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; DMRG; renormalization groups; variational states;

    Sammanfattning : .... LÄS MER