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Visar resultat 1 - 5 av 12 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Bonding Ability Distribution of Fibers in Mechanical Pulp Furnishes

   Författare :Sofia Reyier; Per Engstrand; Hans Höglund; Olof Ferritsius; Hans Ersson; Rita Ferritsius; Philip Reme; Mittuniversitetet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fiber; mechanical pulp; bonding ability; fiber characterization; Bonding Indicator; BIN; acoustic emission; hydrocyclone; Fiberlab; collapse resistance; fibrillation; Fiber; mekanisk massa; bindningsförmåga; fiber karakterisering; Bindnings Indikator; BIN; akustisk emission; hydrocyklon; Fiberlab; kollaps resistans; fibrillering; Cellulose and paper engineering; Cellulosa- och pappersteknik;

   Sammanfattning : This thesis presents a method of measuring the distribution of fiber bonding ability in mechanical pulp furnishes. The method is intended for industrial use, where today only average values are used to describe fiber bonding ability, despite the differences in morphology of the fibers entering the mill. LÄS MER

3. 2. Distributions Of Fiber Characteristics As A Tool To Evaluate Mechanical Pulps

   Författare :Sofia Reyier Österling; Per Engstrand; Hans Höglund; Olof Ferritsius; Rita Ferritsius; Hans Ersson; Per Gradin; Mittuniversitetet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fiber; fibre; fiber characteristics; fiber dimension; fiber properties; mechanical pulp; FiberLab; raw data; distribution; fiber wall thickness; BIN; bonding ability influence; bonding indicator; bonding ability; fiber width; fibrillation; collapse resistance; laboratory sheet; fiber analyzer; optical analyzer; TMP; CTMP; SGW; sheet model; prediction; fiber characterization; hydrocyclone; fractionation; kernel density estimation; KDE; diffusion mixing; acoustic emission; F0.90; Norway spruce; Picea abies;

   Sammanfattning : Mechanical pulps are used in paper products such as magazine or news grade printing papers or paperboard. Mechanical pulping gives a high yield; nearly everything in the tree except the bark is used in the paper. This means that mechanical pulping consumes much less wood than chemical pulping, especially to produce a unit area of printing surface. LÄS MER

4. 3. Utbildning för hållbar utveckling ur ett lärarperspektiv : Ämnesbundna skillnader i gymnasieskolan

   Författare :Carola Borg; Hans-Olof Höglund; Niklas Gericke; Eva Bergman; Anders Arnqvist; Cecilia Lundholm; Karlstads universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Environmental education; Sustainable development; Teaching for sustainability; Teachers understanding; Upper secondary school; Subject -bound differences; Teaching traditions; Interdisciplinary Approach; Teaching methods; Miljöundervising; Hållbar utveckling; Undervsing för hållbar utveckling; Lärares förståelse; Gymnasieskolan; Ämnesbundna skillnader; Undervsingstraditioner; Ämnesövergripande arbetssätt; Undervsings metoder; Biology; Biologi;

   Sammanfattning : This thesis investigates how teachers from different disciplines understand and implement education for sustainable development in their teaching. A nationwide questionnaire study was conducted with 3229 upper secondary school teachers representing 224 schools in Sweden. LÄS MER

5. 4. Knowledge, Value and Personal experience : Upper secondary students' resources of supporting reasons when arguing socioscientific issues

   Författare :Nina Christenson; Hans-Olof Höglund; Shu-Nu Chang Rundgren; Lars Nyberg; Anders Arnqvist; Jenny Lewis; Karlstads universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; socioscientific issues; informal agumentation; SEE-SEP model; Subject didactics; Ämnesdidaktik; Biology; Biologi;

   Sammanfattning : This thesis focuses on upper secondary students’ use of resources in their supporting reasons when arguing socioscientific issues (SSIs). The skills of argumentation have been emphasized in science education during the past decades and SSIs are proven a good context for learners to enhance skills of argumentation and achieve the goal of scientific literacy. LÄS MER

7. 5. Inhibition of light-induced colour reversion of wood-containing papers by means of coating

   Författare :Helena Fjellström; Hans Höglund; Magnus Paulsson; Arthur Ragauskas; Mittuniversitetet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; High-yield pulp; CTMP; birch; light-induced; ageing; photo-stabilising; lignin; coating; pigment; kaolin; calcium carbonate; titanium dioxide; binder; FWA; Chemical engineering; Kemiteknik;

   Sammanfattning : The main purpose of this thesis was to find ways to maintain a low level of light‐induceddiscolouration at an increased addition of mechanical and chemimechanical pulps in coated highqualityfine paper and magazine paper grades. Current technology allows the production of highyieldpulps such as thermomechanical and chemimechanical pulps with properties suitable formanufacturing high‐quality paper or paperboard with a low basis weight. LÄS MER