Sökning: "paper formation"

Visar resultat 41 - 45 av 1312 avhandlingar innehållade orden paper formation.

1. 41. Vocational skills formation in communities of practice : Experiences from primary school and the informal economy in Tanzania

   Författare :Gunilla Höjlund; Robert Höghielm; Michael Young; Stockholms universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Key words: vocational skills formation; vocationalization; apprenticeship; communities of practice; “legitimate; peripheral participation”; ethnographic approach; primary schooling; informal economy; task; Stadi za Kazi Vocational Skill ; education for self-reliance; boundary objects; artisan; Education; Pedagogik;

   Sammanfattning : The purpose of this thesis is to explore the relationship between school and working life in Tanzania; what goes on inside school in relation to what goes on outside. The focus is on vocational skills formation by which is understood the process whereby individuals develop skills necessary for everyday life and gainful employment. LÄS MER

3. 42. Polyelectrolyte multilayers of cationic and anionic starch and their use for improving the strength of papers made from mechanical pulps

   Författare :Lisa Lundström; Lars Wågberg; Mats Johansson; Per Engstrand; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cellulose and paper engineering; Cellulosa- och pappersteknik;

   Sammanfattning : Graphic paper is experiencing severe competition from other materials and, most of all, from other media. This means there is a great need to improve paper quality while reducing raw material and production costs. Polyelectrolyte multilayer (PEM) treatment (i.e. LÄS MER

4. 43. Polyelectrolyte Complexes : Their Characterization and use for Modification of Wood Fibre Surfaces

   Författare :Linda Gärdlund; Lars Wågberg; Robert Pelton; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cellulose and paper engineering; Cellulosa- och pappersteknik; Cellulosa- och pappersteknik; Chemical engineering;

   Sammanfattning : For economical reasons filler particles and less expensive fibre raw materials are more frequently used in papermaking. This influences the mechanical properties of the formed papers in a negative way and it is therefore necessary to add strength-enhancing agents to the papermaking furnish. LÄS MER

5. 44. Development of New Bacteria-Reducing Surfaces

   Författare :Josefin Illergård; Monica Ek; Lars Wågberg; Eva Blolmberg; Ute Römling; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; antibacterial; polyelectrolyte multilayers; polyvinylamine; Cellulose and paper engineering; Cellulosa- och pappersteknik;

   Sammanfattning : In recent years, antibacterial surfaces have been a subject of increased interest. Especiallyinteresting are non-leaching, contact-active surfaces that physically disrupts the bacterialcell using immobilised cationic polymers. Thus the risks of bacterial resistance and discharge of hazardous biocides is minimised. LÄS MER

7. 45. Fibre flow mechanisms

   Författare :Roger Bergström; Ulf Björkman; Bo Norman; Mark Martinez; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fibre flow; floc; shear; compression; fibre network; stress chain; Cellulose and paper engineering; Cellulosa- och pappersteknik;

   Sammanfattning : The flow behaviour, and primarily the floc-floc interaction, of pulp paper suspensions have been studied visually. Analogy models based on these observations have been developed as well as the identification of important parameters of floc break-up in low shear rate flow fields. LÄS MER