Sökning: "proton spectroscopy"

Visar resultat 21 - 25 av 142 avhandlingar innehållade orden proton spectroscopy.

1. 21. Radiotherapy Gel Dosimetry: Development and Application of Normoxic Polymer Gels

   Författare :Helen Gustafsson; Malmö Medicinsk strålningsfysik; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Clinical physics; radiology; tomography; medical instrumentation; Klinisk fysiologi; tomografi; medicinsk instrumentering; Radiofarmaceutisk teknik; Radiopharmaceutical technology; proton; LET; FT Raman spectroscopy; MRI; normoxic gel; IMRT; 3D verification; polymer gel dosimetry; radiologi;

   Sammanfattning : In many radiotherapy applications, true three-dimensional dosimetry with good spatial resolution that can be achieved in a single measurement would be of great value. Polymer gel dosimetry fulfils many of the demands on such a system. In this study, methods to facilitate the implementation of gel dosimetry have been investigated. LÄS MER

3. 22. New Electrolyte Materials for Lithium Batteries and Fuel Cells - an ab initio and vibrational spectroscopy study

   Författare :Henrik Markusson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; IR spectroscopy; lithium salts; Raman spectroscopy; ab initio calculations; electron structure calculations; protic ionic liquids; electrolytes;

   Sammanfattning : In order to reduce our fossil based energy consumption there is an urge for new energy storage and conversion devices such as lithium batteries and fuel cells for more efficient energy use. The heart of these devices is an ion conducting electrolyte which needs to provide high performance at low cost. LÄS MER

4. 23. Synthesis, Structure and Proton Conduction of Substituted BaTiO3 and BaZrO3 Perovskites

   Författare :Seikh Mohammad Habibur Rahman; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; deuteron position; Rietveld refinements; heavily doped oxygen deficient perovskite BaTiO3 BaZrO3 ; neutron total scattering; New proton conductor; X-ray and neutron powder diffraction; RMC modelling.; Impedance spectroscopy;

   Sammanfattning : Proton conducting oxides can be beneficial as electrolyte materials in devices such as fuel cells, hydrogen sensors etc. Proton conducting fuel cells (PCFCs), utilising H2 as fuel, stand out as a promising technology for future clean energy generation. LÄS MER

5. 24. Fingerprints of light-induced molecular transients : from quantum chemical models of ultrafast x-ray spectroscopy

   Författare :Jesper Norell; Michael Odelius; Sang-Kil Son; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; time-resolved x-ray spectroscopy; quantum chemistry; electronic structure; multi-configurational self-consistent field; density functional theory; molecular dynamics; Born-Oppenheimer dynamics; non-adiabatic dynamics; proton-transfer; charge-transfer; solvatization; Dyson orbital; teoretisk fysik; Theoretical Physics;

   Sammanfattning : Absorption of sunlight generates renewable electricity and powers the growth of plants, but also causes severe damage both to synthetic materials and biological tissue. The wildly varying outcomes of these light-induced processes are ultimately determined by much slighter differences in their underlying reaction pathways, induced by the transient properties of short-lived and miniscule molecules; a powerful approach to their detection and characterization is offered by ultrafast x-ray spectroscopy, with identification of spectral fingerprints and further guidance from quantum chemical models. LÄS MER

7. 25. Novel Materials for Fuel Cells and Batteries Light Scattering Studies of the Structure and Dynamics of Polymer Electrolytes

   Författare :Hanna Ericson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; proton conducting polymer; Raman spectroscopy; gel electrolyte; photon correlation spectroscopy; fuel cell membrane; polymer electrolyte;

   Sammanfattning : The development of new materials and technologies for electrochemical energy conversion and storage, such as fuel cells and batteries, is important for a future more efficient use of energy. Polymer electrolytes are key components in polymer electrolyte fuel cells and lithium-based batteries. LÄS MER