Search for dissertations about: "Helena Håkansson"

Showing result 1 - 5 of 9 swedish dissertations containing the words Helena Håkansson.

  2. 1. Ethanol Pulping of Reed Canary Grass

    Author : Helena Håkansson; Karlstads universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Pulping; Nonwood plants; Reed canary grass; Ethanol; Organosolv pulping; Statistical analysis; Chemical Engineering; Kemiteknik;

    Abstract : The aim of this study was to investigate the possibility of processing an agricultural crop grown in Sweden to usable pulp. A further purpose was to study ethanol pulping applied to a non-wood raw material.The first part of this thesis deals with the criteria for selecting a fibre crop for further studies. READ MORE

  4. 2. Ethanol pulping of reed canary grass

    Author : Helena Håkansson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; pulping; ethanol; nonwood plants; reed canary grass; organosolv pulping; statistical analysis;

    Abstract : .... READ MORE

  5. 3. Preparation and Characterization of Chemical Pulps from Wood and Reed Canary Grass

    Author : Helena Håkansson; Karlstads universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; pulping; wood; reed canary grass; acid hydrolysis; microcrystalline cellulose; Chemical Engineering; Kemiteknik;

    Abstract : This thesis presents laboratory results from ethanol pulping of reed canary grass for the production of paper pulp. The focus was on the influence of cooking pa-rameters on the delignification. The strength of the grass pulps was found to be low and the use of such pulps will therefore be limited to a few products. READ MORE

  6. 4. Language Choice and Code-Switching in the Azerbaijani Community in Tehran : A conversation analytic approach to bilingual practices

    Author : Helena Bani-Shoraka; Carina Jahani; Gisela Håkansson; Jens Normann Jørgensen; Uppsala universitet; []
    Keywords : Iranian languages; Language maintenance; Language shift; Code-switching; Style-shifting; Conversation analysis; Bilingualism; Azerbaijani; Persian; Language policy; Iranska språk - allmänt; iranska språk; Iranian Languages;

    Abstract : This study examines language choice and code-switching patterns found in the Azerbaijani speech community in Tehran, Iran. Two empirical studies have been combined. READ MORE

  7. 5. Process modelling based on data from an evaporation and a CTMP process : Analysis of energy efficiency and process variability

    Author : Daniel Ekbåge; Lars Nilsson; Helena Håkansson; Per Engstrand; Karlstads universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; CTMP; process modelling; evaporation; energy efficiency; Miljö- och energisystem; Environmental and Energy Systems;

    Abstract : The manufacture of pulp and paper is an energy intensive process configured of several unit processes that shape a network of flows of wood chips, chemical pulp, mechanical pulp, paperboard, steam and other important components. Improved energy efficiency supports sustainability of the process and the products. READ MORE