Sökning: "secondary electron yield"

Visar resultat 1 - 5 av 18 avhandlingar innehållade orden secondary electron yield.

1. 1. Low Secondary Electron Yield Carbon Coatings for Electron Cloud Mitigation in Modern Particle Accelerators

   Författare :Christina Yin Vallgren; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Raman spectroscopy; NRA; amorphous carbon; secondary electron yield; LIU; X-Ray Photoelectron Spectroscopy; SEY; AFM; electron cloud; SPS dipole magnet;

   Sammanfattning : In order to upgrade the Large Hadron Collider (LHC) performance to be oriented towards higher energies and higher intensities in the future, a series of improvementsof the existing LHC injectors is planned to take place over the next few years. Electron cloud effects are expected to be enhanced and play a central role in limiting theperformance of the machines of the CERN complex. LÄS MER

3. 2. Photoinduced Electron Transfer in Luminescent Lanthanide Complexes

   Författare :Daniel Kovacs; Eszter Borbas; Stephen Faulkner; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Lanthanide; Luminescence; Photoinduced electron transfer; Kemi; Chemistry;

   Sammanfattning : Luminescence from the trivalent lanthanides is used for detection in biological systems. Lanthanide luminescence is usually sensitized by a light-harvesting organic chromophore (’antenna’). An ideal emitter has an antenna that efficiently transfers energy to the lanthanide, and a ligand that shields the metal from quenching solvent molecules. LÄS MER

4. 3. Microscopic Characterisation of Solar Cells : An Electron Microscopy Study of Cu(In,Ga)Se2 and Cu2ZnSn(S,Se)4 Solar Cells

   Författare :Jörn Timo Wätjen; Marika Edoff; Angus Rockett; Uppsala universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEM; SEM; FIB; solar cell; CIGS; CZTS; Alternative buffer layers; Gallium gradients; microscopic electrical characterisation; Secondary Phases; Teknisk fysik med inriktning mot elektronik; Engineering Science with specialization in Electronics;

   Sammanfattning : The sun provides us with a surplus of energy convertible to electricity using solar cells. This thesis focuses on solar cells based on chalcopyrite (CIGSe) as well as kesterite (CZTS(e)) absorber layers. These materials yield record efficiencies of 20.4 % and 11. LÄS MER

5. 4. Chemoenzymatic Dynamic Kinetic Resolution of Functionalized Secondary Alcohols

   Författare :Richard Lihammar; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Dynamic kinetic resolution (DKR) is the combination of a kinetic resolution with an in situ racemization and is a powerful method for obtaining optically active compounds. In this thesis various secondary alcohols are transformed to their corresponding enantiomerically enriched acetates by employing immobilized lipases as resolution catalysts and transition metal complexes as racemization catalysts. LÄS MER

7. 5. Modern Computational Physical Chemistry : An Introduction to Biomolecular Radiation Damage and Phototoxicity

   Författare :Jorge Llano; Leif A. Eriksson; Ulf Ryde; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; statistical mechanics; biophysical chemistry; interface; surface thermodynamics; bioelectrochemistry; ionizing radiation; radiation therapy; condensed matter; computational chemistry; nucleic acids; radiation damage; electrode potential; electronic transport; photochemistry; strand break; photodynamic action; cytostatic; solvation; solvated electron; absolute potential; chemical potential; Biologi; Biology; Biologi;

   Sammanfattning : The realm of molecular physical chemistry ranges from the structure of matter and the fundamental atomic and molecular interactions to the macroscopic properties and processes arising from the average microscopic behaviour.Herein, the conventional electrodic problem is recast into the simpler molecular problem of finding the electrochemical, real chemical, and chemical potentials of the species involved in redox half-reactions. LÄS MER