Sökning: "Lena Björkman"

Hittade 3 avhandlingar innehållade orden Lena Björkman.

1. 1. The Role Of Serum Amyloid A In Inflammatory Disease - Proinflammatory Mediator Or Inert Biomarker?

   Författare :Lena Björkman; Göteborgs universitet; []
   Nyckelord :neutrophils; serum amyloid A; rheumatoid arthritis;

   Sammanfattning : Abstract: Neutrophils are phagocytes of the innate immune system with prominent roles in host defense and are also believed to be important in autoimmune diseases such as rheumatoid arthritis (RA) by accumulating in inflamed joints and contribute to tissues destruction. Neutrophils differentiate in the bone-marrow and are mature cells when entering circulation with a cytoplasm packed with granules that contain toxic substances in addition to receptors that can be up-regulated to the cell surface during activation. LÄS MER

3. 2. Bio-coal as an alternative reducing agent in the blast furnace

   Författare :Asmaa El-Tawil; Lena Sundqvist Öqvist; Bo Björkman; Henrik Saxen; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Devolatilization; torrefied biomass; bio-coal; volatile matter; reduction; blast furnace; Process Metallurgy; Processmetallurgi;

   Sammanfattning : The steel industry is aiming to reduce CO2 emissions by different means; in the short-term, by replacing fossil coal with highly reactive carbonaceous material like bio-coal (pretreated biomass) and, in the longer term, by using hydrogen. The use of bio-coal as part of top charged briquettes also containing iron oxide has the potential to lower the thermal reserve zone temperature of the Blast furnace (BF) and, due to improved gas efficiency, thereby give a high replacement ratio to coke. LÄS MER

4. 3. Influence of the properties of bio-coal as a substitute for fossil coal in carbon composite agglomerates and in coke

   Författare :Asmaa El-Tawil; Lena Sundqvist Ökvist; Bo Björkman; Timo Fabritius; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Bio-coal; devolatilization; bio-agglomerates; bio-coke; Centrumbildning - Centrum för avancerad gruvteknik och metallurgi CAMM ; Centre - Centre for Advanced Mining Metallurgy CAMM ; Process Metallurgy; Processmetallurgi;

   Sammanfattning : The iron-ore-based blast furnace (BF) process is still the most dominant method for producing metallic iron units for steelmaking, and the BF is also the main contributor to the 7-9% of global CO2 emissions which, according to World Steel Association, originate from the steel industry.  The steel industry is aiming to reduce CO2 emissions by different means. LÄS MER