Sökning: "Wittgren"

Visar resultat 1 - 5 av 7 avhandlingar innehållade ordet Wittgren.

  1. 1. Size Characterisation of Water-Soluble Polymers Using Asymmetrical Flow Field-Flow Fractionation

    Författare :Bengt Wittgren; Centrum för analys och syntes; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; multi-angle light scattering; molar mass distribution; aggregation; size characterisation; Asymmetrical flow FFF; water-soluble polymers; polysaccharides; Chemical technology and engineering; Kemiteknik och kemisk teknologi;

    Sammanfattning : Size, as expressed by molar mass, radius of gyration or hydrodynamic radius, for example, is a fundamental parameter of polymers in solution. Thus, there is a strong need for the characterisation of both the size and shape of polymers, particularly of those utilised in various industrial applications. LÄS MER

  2. 2. Katalogen – nyckeln till museernas kunskap? : Om dokumentation och kunskapskultur i museer

    Författare :Bengt Wittgren; Kerstin Smeds; Magdalena Gram; Umeå universitet; []
    Nyckelord :HUMANITIES; HUMANIORA; HUMANIORA; HUMANITIES; Museums; Archives; Libraries; MLA sector; GLAM; collections management; classification; Museologi; Museology;

    Sammanfattning : In the 1990s, the MLA sector – archives, libraries, museums – was defined as a comprehensive sector. One of the reasons for this was the belief that the digitizing of institutional collections and catalogues would provide a seamless access to the cultural heritage for the general public. LÄS MER

  3. 3. Removal of wastewater nitrogen in a wetland filter

    Författare :Hans Bertil Wittgren; Linköpings universitet; []

    Sammanfattning : An artificial wetland system, designed to achieve year-round wastewater treatment concomitantly with nutrient recycling, was studied for three years. As part of a joint research project, this thesis focuses on nitrogen transformations and nitrogen removal capacity. LÄS MER

  4. 4. Diffuse emissions from goods : influences on some societal end products

    Författare :Jennie Amneklev; Bo Bergbäck; Hans-Bertil Wittgren; Linnéuniversitetet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Arsenic; bismuth; CCA-treated wood; copper; material flow analysis; silver; substance flow analysis; urban flows; Miljövetenskap; Environmental Science;

    Sammanfattning : End products of society (e.g. sewage sludge and incineration ashes) can be used as indicators of the use of chemicals in consumer goods. Through upstream work the sources of substances released from goods may be identified before the emissions reach the end products. LÄS MER

  5. 5. Performance Assessment of Wastewater Treatment Plants : Multi-Objective Analysis Using Plant-Wide Models

    Författare :MAGNUS ARNELL; Bengt Carlsson; Ulf Jeppsson; Diego Rosso; Hans Bertil Wittgren; Magnus Arnell; Industriell elektroteknik och automation; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; benchmarking; BSM; samrötning; energieffektivitet; växthusgasutsläpp; livscykelanalys; matematisk modellering; avloppsvattenrening; benchmarking; BSM; codigestion; energy efficiency; greenhouse gases; life cycle assessment; mathematical modelling; wastewater treatment; benchmarking;

    Sammanfattning : As the knowledge about anthropogenic impacts of climate change has grown, the awareness of the contributions from treatment of wastewater has widened the scope for wastewater treatment plants (WWTPs). Not only shall ever stricter effluent constraints be met, but also energy efficiency be increased, greenhouse gases mitigated and resources recovered. LÄS MER