Sökning: "paper formation"

Visar resultat 36 - 40 av 1312 avhandlingar innehållade orden paper formation.

1. 36. Drömmar om det minsta : Mikrofilm, överflöd och brist, 1900–1970

   Författare :Matts Lindström; Staffan Bergwik; Solveig Jülich; Pelle Snickars; Eva Hemmungs Wirtén; Stockholms universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; history of media; old and new media; microfilm; microphotography; Paul Otlet; Robert Binkley; Watson Davis; Rekolid AB; Erik Wästberg; Carl Björkbom; Hilda Lindstedt; Mormon microfilming in Sweden; logistical media; logistics of knowledge; paper; paperwork; entropy; noise; Michel Serres; information history; information overflow; idéhistoria; History of Ideas;

   Sammanfattning : This thesis explores the cultural history of microfilm and microphotography during the period 1900–1970, thus contributing to the broader field of research on the history of 20th century information management in the era before digital technology. The aim is to study how microfilm repeatedly, in various contexts and over time, was described and perceived as a new medium. LÄS MER

3. 37. Light-Induced Yellowing of High-Yield Pulps. The Effect of Acetylation

   Författare :Magnus Paulsson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; yellowing; mechanical properties; hydroxyl groups; phenolic groups; paper; high-yield pulps; chromophores; model compounds; acetylation; inhibition;

   Sammanfattning : This thesis is a contribution to the understanding of the mechanism of photoyellowing of high-yield pulps. It also gives some general information about the reactivity of different functional groups in lignin towards acetic anhydride. LÄS MER

4. 38. Some aspects on strength properties in paper composed of different pulps

   Författare :Hanna Karlsson; Luciano Beghello; Lars Nilsson; Lennart Stolpe; Øyvind Gregersen; Karlstads universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; paper strength; reinforcement; multilayer; stratified; handsheet former; abaca; southern pine; Chemical engineering; Kemiteknik; Chemical Engineering; Kemiteknik;

   Sammanfattning : For papermakers, an understanding of the development of strength properties in the paper is of uttermost importance. Strong papers are desirable both in the traditional paper industry as well as in new fields of application, such as fibre-based packaging and light-weight building material. LÄS MER

5. 39. Data Mining and Analysis for Characterizing Paper from On-line Multisensor Measurements

   Författare :Marcus Ejnarsson; Adas Gelzinis; Högskolan i Halmstad; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Feature Extraction; Kernel Based Novelty Detection; Kernel CCA; Monitoring; Newsprint; Paper Web; Time-Series Representation; TECHNOLOGY; TEKNIKVETENSKAP;

   Sammanfattning : The objective of this thesis is to develop a multi-resolution tool for screening paper formation variations, aiming to detect abnormalities in various frequency regions ranging from millimeters to several meters. The abnormalities detected in different frequency regions give an indication for the paper maker about specific disturbances in the paper production process. LÄS MER

7. 40. On the oxidation of kraft pulp - Formation of carbonyl groups during acidic hydrogen peroxide oxidation

   Författare :Axel Martinsson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; bleaching; Hydrogen Peroxide; wet-strength; cellulose oxidation;

   Sammanfattning : A shift from fossil based to bio based raw material is necessary if the needs of a growing population are to be fulfilled sustainably. Today, the packaging industry is heavily dependent on products originating from fossil feedstocks. LÄS MER