Sökning: "Dilute"

Visar resultat 6 - 10 av 195 avhandlingar innehållade ordet Dilute.

1. 6. Magneto-optical studies of dilute nitrides and II-VI diluted magnetic semiconductor quantum structures

   Författare :Daniel Dagnelund; Irina Buyanova; Weimin Chen; Marek Godlewski; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Dilute nitrides; DMS; defect; ODMR; optically detected magnetic resonance; spin injection; PLE; photoluminescence excitation; post-growth hydrogenation; heterojunction; Semiconductor physics; Halvledarfysik;

   Sammanfattning : This thesis work aims at a better understanding of magneto-optical properties of dilute nitrides and II-VI diluted magnetic semiconductor quantum structures. The thesis is divided into two parts. The first part gives an introduction of the research fields, together with a brief summary of the scientific results included in the thesis. LÄS MER

3. 7. Magnetooptical properties of dilute nitride nanowires

   Författare :Mattias Jansson; Irina A Buyanova; Weimin Chen; Jan Eric Stehr; Hannah Joyce; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : Nanostructured III-V semiconductors have emerged as one of the most promising materials systems for future optoelectronic applications. While planar III-V compounds are already at the center of the ongoing lighting revolution, where older light sources are replaced by modern white light LEDs, fabricating such materials in novel architectures, such as nanowires and quantum dots, creates new possibilities for optoelectronic applications. LÄS MER

4. 8. Continuous Ethanol Production from Dilute-acid Hydrolyzates: Detoxification and Fermentation Strategy

   Författare :Ronny Purwadi; Högskolan i Borås; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; HMF; serial bioreactor; immobilization; overliming; furfural; ethanol; continuous cultivation; S. cerevisiae; flocculating yeast; continuous detoxification; dilute-acid hydrolyzate;

   Sammanfattning : The production of fuel ethanol from cellulosic biomass is of growing interest around the world. Lignocellulosic residuals can be used to produce transportation fuel, with the overall process having little net production of greenhouse gases. LÄS MER

5. 9. Countercurrent operation in the dilute-acid hydrolysis of cellulose for ethanol production

   Författare :Pär Pettersson; Avdelningen för kemiteknik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; model; lignocellulose; wood; cellulose; ethanol production; dilute-acid hydrolysis; countercurrent; Kemiteknik och kemisk teknologi; Chemical technology and engineering;

   Sammanfattning : Fuel ethanol can be produced from lignocellulosic materials to replace gasoline and diesel. A crucial step in the production process is the hydrolysis (saccharification) of the material, which can be achieved with dilute acid at high temperature. Unfortunately, sugar is degraded under these severe conditions, and the sugar yield is generally low. LÄS MER

7. 10. Ethanol from lignocellulose : Alkali detoxification of dilute-acid spruce hydrolysates

   Författare :Björn Alriksson; Karlstads universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biochemistry; Biokemi; Kemi; Chemistry;

   Sammanfattning : Detoxification of dilute-acid lignocellulose hydrolysates by treatment with Ca(OH)2 (overliming) efficiently improves the production of fuel ethanol, but is associated with drawbacks like sugar degradation and CaSO4 precipitation. In factorial designed experiments, in which pH and temperature were varied, dilute-acid spruce hydrolysates were treated with Ca(OH)2, NH4OH or NaOH. LÄS MER