Sökning: "farms"

Visar resultat 11 - 15 av 276 avhandlingar innehållade ordet farms.

  1. 11. Continuity or not? : Family farming and agricultural transformation in 20th century Estonia

    Författare :Hans Jörgensen; Olle Krantz; Sven Nordlund; Anu Mai Kõll; Umeå universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Economic history; Estonia; agricultural transformation; family farms; private plots; co-operation; kolkhoz; sovkhoz; export markets; land reform; restitution; decollectivisation; subsistence farms; comparisons; Ekonomisk historia; Economic history; Ekonomisk historia; ekonomisk historia; Economic History;

    Sammanfattning : This doctoral thesis explores the agrarian development in 20th Estonia and the role of family farming during three major agricultural transformations. It consists of four papers and an introductory chapter for which the common departure are the situation appearing in the Estonian farming landscape after the regained independence in 1991. LÄS MER

  3. 12. Bygden, byarna och buan : studier av bebyggelsenamnen i Hackås och Ovikens socknar, med ett särskilt avsnitt om fäbodnamnen

    Författare :Josefin Devine; Lars-Erik Edlund; Mats Wahlberg; Tom Schmidt; Umeå universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; place-names; Sweden; Jämtland; onomastics; etymology; settlement names; continuity; summer farms; transhumance; ortnamn; Sverige; Jämtland; onomastik; namnforskning; etymologi; bebyggelsenamn; kontinuitet; fäbodnamn; fäbodväsende; Scandinavian Languages; nordiska språk; Namnforskning;

    Sammanfattning : The purpose of this study is to investigate the etymological background of the settlement names in the parishes of Hackås and Oviken in the province of Jämtland, and use the names to elucidate the settlement history of the area. Another purpose is to discuss the relationship between, and the semantic development of, the name element and common noun ås. LÄS MER

  4. 13. System Aspects and Modulation Strategies of an HVDC-based Converter System for Wind Farms

    Författare :Stephan Meier; Hans-Peter Nee; Boon-Teck Ooi; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Isolated AC DC Converter; Mutual Commutation; Soft Switching; Voltage Source Converter; Cycloconverter; Modulation Strategies; Medium-Frequency Transformer; HVDC Transmission; Wind Power; Wind Farms; Electric power engineering; Elkraftteknik; Electrical engineering; Elektroteknik;

    Sammanfattning :   In this thesis, a new HVDC-based converter system for wind farms is investigated. It is based on a mutually commutated soft-switching converter system and provides a unique integrated solution for the wind turbine generator drive systems, the wind turbine interconnection, and the power conversion for HVDC transmission. LÄS MER

  5. 14. Numerical Computations of Wakes Behind Wind Farms

    Författare :Ola Eriksson; Stefan Ivanell; Simon-Philippe Breton; Anna Rutgersson; Dan Henningson; Niels Troldborg; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Wind turbine; Wind power; Wind farm; Wakes; Long distance wakes; Farm-Farm; Farm to farm interaction; Wind farm cluster; Large Eddy simulations; LES; Actuator disc method; ACD; CFD; Ellipsys3D;

    Sammanfattning : More and larger wind farms are planned offshore. As the most suitable build sites are limited wind farms will be constructed near to each other in so called wind farm clusters. Behind the wind turbines in these farms there is a disrupted flow of air called a wake that is characterized by reduced wind speed and increased turbulence. LÄS MER

  7. 15. Numerical Computations of Wakes Behind Wind Farms : A tool to study Farm to Farm interaction

    Författare :Ola Eriksson; Stefan Ivanell; Anna Rutgersson; Simon-Philippe Breton; Philippe Chatelain; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Wind turbine; Wind power; Wind farm; Wakes; Long distance wakes; Farm-Farm; Farm to farm interaction; Wind farm cluster; Large Eddy simulations; LES; Actuator disc method; ACD; CFD; Ellipsys3D; Prescribed boundary layer; PBL; Forced boundary layer; FBL; Meteorologi; Meteorology;

    Sammanfattning : More and larger wind farms are planned offshore. As the most suitable sites to build are limited these new wind farms will be constructed near to each other in so called wind farm clusters. Behind the wind turbines in these farms there is a disrupted flow of air called a wake that is characterized by reduced wind speed and increased turbulence. LÄS MER