Sökning: "per walter"
Visar resultat 1 - 5 av 12 avhandlingar innehållade orden per walter.
1. The use of Fenton chemistry for reducing the refining energy during TMP production : the effect of free ferrous and free or chelated ferric ions
Sammanfattning : The potential of using acid hydrogen peroxide under Fenton conditions to lowerthe electrical energy consumed during the production of Black spruce (Piceamariana) thermomechanical pulp (TMP) was investigated in pilot scale. Thechemical system, which consisted of ferrous sulphate, hydrogen peroxide andoptionally an enhancer (such as a chelating agent), was evaluated as an inter-stagetreatment. LÄS MER
2. Influence of acid hydrogen peroxide treatment on refining energy and TMP properties
Sammanfattning : The potential of using acid hydrogen peroxide under Fenton conditions to lower the electrical energy consumed during the production of Black spruce (Picea mariana) thermomechanical pulp (TMP) was investigated. The chemical system, which consisted of ferrous sulphate, hydrogen peroxide and optionally an enhancer (3,4-dimethoxybenzyl alcohol, ethylenediaminetetraacetic acid or oxalic acid/sodium oxalate), was evaluated as an inter-stage treatment where the primary refiner was used as a mixer. LÄS MER
3. Interaction Between Microgels and Oppositely Charged Peptides
Sammanfattning : Lightly cross-linked polyelectrolyte microgels are materials with interesting properties for a range of applications. For instance, the volume of these particles can be drastically changed in response to pH, ionic strength, temperature, or the concentration of specific ions and metabolites. LÄS MER
4. Making Meals in Restaurants : Daily Practices and Professional Ideals
Sammanfattning : Thanks to the gastronomic development in recent decades in Sweden, the restaurant industry is growing significantly and has opportunities to attract new and wider groups of labour. However, despite media images of successful chefs and culinary creativity, there is a common perception of tiring working conditions and low wages that prevent restaurants from attracting staff. LÄS MER
5. Irritable Bowel Syndrome : Diagnostic Symptom Criteria and Impact of Rectal Distensions on Cortisol and Electrodermal Activity
Sammanfattning : In a population prevalence questionnaire study we demonstrated that constipation and fecal incontinence are common problems in the general Swedish population with a similar magnitude as in other Western countries. 95.6% of the population had between three bowel movements per day and three per week. LÄS MER