Sökning: "Temperature equilibrium."

Visar resultat 11 - 15 av 96 uppsatser innehållade orden Temperature equilibrium..

1. 11. Time-resolved x-ray diffraction study of longitudinal optical phonons in zincblende semiconductors

   Master-uppsats, Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionen

   Författare :Lassi Linnala; [2022]
   Nyckelord :femtosecond THz radiation; ultrafast x-ray diffraction; pump-probe; longitudinal optical phonons; zincblende semiconductors; anharmonic decay; density functional perturbation theory; Physics and Astronomy;

   Sammanfattning : Anharmonic decay of longitudinal optical (LO) phonons in zincblende semiconductors is not at present well characterized due to the polar and many-body nature of the problem. Femtosecond THz radiation offers a novel route to this study, as the interaction of this radiation is directly with the phonon lattice and these THz excited phonons do not have enough energy to excite electrons over the band gap. LÄS MER

3. 12. Modeling of Biomass Gasification with Adaptation to Biological Methanation Using Aspen Plus®

   Master-uppsats, Lunds universitet/Kemiteknik (CI)

   Författare :Abdallah Almashharawi; [2022]
   Nyckelord :Biomass gasification; Cyclone gasifier; Aspen Plus; Syngas; Synthesis gas; Biogas; Biological methanation; Methane; CO2; RISE; Meva; Gas-cleaning; Gas cleaning; equilibrium; kinetic; pyrolysis; validation; Moisture content; Chemical engineering; Technology and Engineering;

   Sammanfattning : حظيت البدائل المتجددة باهتمام كبير في ظل انخفاض موارد الوقود الاحفوري المتاحة وزيادة المتطلبات البيئية. ان انتاج المواد الكيميائية والوقود المتجدد من خلال استغلال الكتلة الحيوية يقدم طريقا واعدا لدفع هذا التحول الى الامام. LÄS MER

4. 13. Doping Layers in Quantum Cascade Lasers: A study in doping density, position and migration effects

   Master-uppsats, Lunds universitet/Matematisk fysik

   Författare :Josefin Reftlér; [2022]
   Nyckelord :Physics and Astronomy;

   Sammanfattning : Quantum Cascade Lasers (QCLs) consist of several semiconductor materi- als sandwiched together. The QCL achieves stimulated emission in the mid-IR (m-IR) to the THz region of the electromagnetic spectrum by inter-subband transitions. These parts of the electromagnetic spectrum are hard to lase in with conventional means. LÄS MER

5. 14. Improvement of Pt-based catalyst supported on CeZrO2 used for the high-temperature water-gas shift reaction

   Master-uppsats, Lunds universitet/Kemiteknik (CI)

   Författare :Milda Grikainyte; [2022]
   Nyckelord :Water-gas shift; catalyst; chemical engineering; Chemistry;

   Sammanfattning : The iron-chromium (Fe/Cr) catalyst is used for high-temperature water-gas shift (HT WGS) reaction. A major concern using the Fe/Cr catalyst is that it contains hexavalent chromium (Cr+6) which is a potent carcinogen causing health and environmental issues. LÄS MER

7. 15. Experimental characterization of a specific chemisorbent and a physisorbent for direct air capture application : Analyzing the effect of parameters such as desorption temperature, humidity and varying CO2 partial pressure on the performance of the adsorbent material. (Thesis work carried out at The Netherlands Organization for Applied Scientific Research (TNO), Delft, The Netherlands)

   Master-uppsats, KTH/Skolan för industriell teknik och management (ITM)

   Författare :MIT RAKESH SURATI; [2022]
   Nyckelord :;

   Sammanfattning : Climate change has become an indisputable threat to the planet with global warming being at the forefront. With continuous usage and combustion of fossil fuels, the atmospheric CO2 concentration has kept on increasing leading to higher average temperatures globally. LÄS MER