Sökning: "Phase transition"

Visar resultat 31 - 35 av 799 avhandlingar innehållade orden Phase transition.

1. 31. Transition metal oxide surfaces : Surface structures and molecular interaction

   Författare :Markus Soldemo; Jonas Weissenrieder; Mats Göthelid; Sarp Kaya; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik;

   Sammanfattning : Metal oxides are both corrosion products and useful materials with a wide range of applications. Two of the most used metals today are iron and copper. In this thesis, surface structures and molecular interaction with surfaces of iron oxides and copper oxides are studied using spectroscopy and microscopy methods. LÄS MER

3. 32. Water Governance in Transition

   Författare :Lina Suleiman; Göran Cars; Jan-Erik Gustafsson; Erik Swyngedouw; KTH; []
   Nyckelord :Water governance; public private partnership; civil society; new institutional economics; Accra; Amman;

   Sammanfattning : The constraints experienced by water utilities in developing countries, with regard to the universal provision of access to water and improved water services, have been defined by international policymakers as "a crisis of governance". This study departs from the theoretical perspectives on governance and aspires to accumulate knowledge and advance understanding on how the performance of water utilities can be enhanced. LÄS MER

4. 33. Corrosion of High-Temperature Alloys in Molten Salts

   Författare :Esraa Hamdy Mohamedin; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Thermal energy storage; Pre-oxidation; Carburisation; Molten salts; Phase transition; High-temperature corrosion; Alumina-forming alloys; Alkali transition metalates; Alkali aluminate; Chromia-forming alloys; Alumina; Concentrated solar power;

   Sammanfattning : Concentrated solar power (CSP) is an interesting technology that involves storing solar energy in the form of heat and subsequently converting it into electricity. The third-generation (Gen3) CSP plants aim to operate at temperatures >700°C, necessitating the deployment of new heat storage materials that can withstand such high operating temperatures. LÄS MER

5. 34. EM Estimation in Phase Type Models

   Författare :Marita Olsson; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; phase type distributions; coxian distribution; EM algorithm; I-divergence; density estimation; right censoring; interval censoring; standard error estimation; asymptotic theory; jackknife; relapse clinical trials; survival data; hidden Markov chain; I-divergence;

   Sammanfattning : This thesis consists of four articles whose theme in common is the class of phase type distributions. In the first article an EM algorithm is presented to estimate the parameters of a phase type distribution of fixed order. Also, it is shown that the algorithm can be used to approximate other continuous distributions by phase type distributions. LÄS MER

7. 35. Resistivity and the solid-to-liquid transition in high-temperature superconductors

   Författare :Beatriz Espinosa Arronte; Magnus Andersson; Charles Simon; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; high-temperature superconductors; vortex dynamics; vortex solid-to-liquid transition; critical scaling; glass transition; Bose glass; heavy-ion irradiation; YBCO; Tl2Ba2CaCu2O8 d; oxygen deficiency.; Condensed matter physics; Kondenserade materiens fysik;

   Sammanfattning : In high-temperature superconductors a large region of the magnetic phase diagram is occupied by a vortex phase that displays a number of exciting phenomena. At low temperatures, vortices form a truly superconducting solid phase which at high temperatures turns into a dissipative vortex liquid. LÄS MER