Sökning: "negative ions"

Visar resultat 31 - 35 av 126 avhandlingar innehållade orden negative ions.

1. 31. Self-Diffusion and Microstructure of Some Ionic Liquids in Bulk and in Confinement

   Författare :Andrei Filippov; Luleå tekniska universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemistry of Interfaces; Gränsytors kemi; Smarta maskiner och material FOI ; Smart machines and materials AERI ;

   Sammanfattning : An ionic liquid (IL) is a salt, which usually is in the liquid state at normal temperature and pressure. The properties of ILs can be adjusted for various processes and applications by choosing different combinations of ions. Similar to other salts, ILs contain only ions with positive (cations) and negative (anions) charges in equal proportions. LÄS MER

3. 32. Pre-biotic molecules and dynamics in the ionosphere of Titan : a space weather station perspective

   Författare :Oleg Shebanits; Jan-Erik Docent; Ingo Müller-Wodarg; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Saturn; Titan; Ionosphere; Langmuir Probe; Space and Plasma Physics; Rymd- och plasmafysik;

   Sammanfattning : Saturn’s largest moon Titan (2575 km radius) is the second largest in the Solar system. Titan is the only known moon with a fully developed nitrogen-rich atmosphere with ionosphere extending to ~2000 km altitude, hosting complex organic chemistry. LÄS MER

4. 33. Ion cyclotron resonance heating and current drive in tokamaks

   Författare :Johan Carlsson; KTH; []
   Nyckelord :;

   Sammanfattning : In this thesis numerical studies, performed with theMonte-Carlo code FIDO of the evolution of the resonant-iondistribution function in the presence of ion cyclotronresonance heating (ICRH) in toroidal geometry are presented. Inparticular it is pointed out how the absorption of toroidalmomentum from a wave field with finite parallel wave numberscauses spatial drift and diffusion, which together with thefinite orbit widths of the tail ions is shown to have a largeeffect on the temperature profile of the resonant ion speciesand also to cause losses of high-energy ions to the wall. LÄS MER

5. 34. Titan’s ionosphere and dust : – as seen by a space weather station

   Författare :Oleg Shebanits; Jan-Erik Wahlund; Wolf Dietrich Geppert; Olle Björneholm; Erik Vigren; Cesar Bertucci; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Titan; Cassini; Ionosphere; Dusty plasma; Ion-ion plasma; Langmuir probe; aerosols; tholins; Space and Plasma Physics; Rymd- och plasmafysik;

   Sammanfattning : Titan, the largest moon of Saturn, is the only known moon with a fully developed nitrogen-rich atmosphere, its ionosphere is detectable as high as 2200 km above its surface and hosts complex organic chemistry. Titan’s atmosphere and ionosphere has striking similarities to current theories of these regions around Earth 3.5 billion years ago. LÄS MER

7. 35. Shaking the EF-Hand. Dynamics and Ion-Binding to Calmodulin and Calbindin D9k

   Författare :Anders Malmendal; Biofysikalisk kemi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; magnesium; line shape; ion binding; EF-hand; cooperativity; conformational exchange; chemical shift; calmodulin; calcium; calbindin D9k; allostery; backbone dynamics; NMR; relaxation; Physical chemistry; Fysikalisk kemi;

   Sammanfattning : The work described in this thesis represents a biophysical approach, mainly using nuclear magnetic resonance (NMR) spectroscopy, to investigate the impact of magnesium ions on the EF-hand calcium-binding proteins calmodulin and calbindin D9k, as well as the dynamics of these proteins at low calcium levels. The x-ray structure of magnesium-saturated calbindin D9k shows a magnesium ion in only one of the two ion binding sites. LÄS MER