Search for dissertations about: "2010"

Showing result 6 - 10 of 3583 swedish dissertations containing the word 2010.

  2. 6. Extended Mercerization Prior to Carboxymethyl Cellulose Preparation

    Author : Heléne Almlöf; Ulf Germgård; Björn Kreutz; Monica Ek; Karlstads universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Carboxymethyl cellulose; Mercerization; DS; FT Raman spectroscopy; Filtration ability; Chemical engineering; Kemiteknik; Chemical Engineering; Kemiteknik;

    Abstract : Carboxymethyl cellulose (CMC) is produced commercially in a two-stage process consisting of a mercerization stage, where the pulp is treated with alkali in a water alcohol solution, followed by an etherification stage in which monochloroacetic acid is added to the pulp slurry. In this thesis an extended mercerization stage of a spruce ether pulp was investigated where the parameters studied were the ratio of cellulose I and II, concentration of alkali, temperature and retention time. READ MORE

  4. 7. Environmental and ethical aspects of destruction of ammunition

    Author : Karin Alverbro; Göran Finnveden; Ronald Wennersten; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Other civil engineering and architecture; Övrig samhällsbyggnadsteknik och arkitektur;

    Abstract : Many decision-making situations today affect the safety of individuals and the environment,for instance hazardous waste management. In practice, many of these decisions are madewithout an overall view and with the focus on either the environment or safety. Now and then the areas of regulation are in conflict, i.e. READ MORE

  5. 8. Simulations of thermoelectric transport in granularsuperconductors

    Author : Andreas Andersson; Jack Lidmar; Vladimir Krasnov; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Superconductivity; Supraledning;

    Abstract : This thesis presents results from numerical simulations of the Nernst effect dueto phase fluctuations in models of two-dimensional granular superconductors. Inaddition other transport properties, such as thermal conductivity and electrical re-sistivity are calculated. READ MORE

  6. 9. Olfactory cues and insects - scaling relations and immigration rates

    Author : Petter Andersson; Stockholms universitet; []
    Keywords : växtekologi; Plant Ecology;

    Abstract : For herbivorous insects, location of host plants and habitat patches strongly depend on the type of sensory cue that is used during the search process and the probability of detecting a patch depends on the relative attraction between patches of different size. The visual impression of a patch increases predictably with the patch diameter and consequently, immigration rates of visually searching insects are often predicted by the scaling to patch size of visual cues. READ MORE

  7. 10. Evaluation of two hydrocyclone designs for pulp fractionation

    Author : Rasmus Andersson; Mikael Lindström; Per Engstrand; Kristofer Gamstedt; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Chemical engineering; Kemiteknik;

    Abstract : The process conditions and fractionation efficiency of two hydrocyclone designs, a novel and a conventional conical design, were evaluated. The novel design comprised a modified inlet section, where the pulp suspension had to pass a narrow ring-shaped opening, and a very compact fractionation zone. READ MORE