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Visar resultat 1 - 5 av 51 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Chloride Homeostasis in Central Neurons

   Författare :Tushar Yelhekar; Staffan Johansson; Michael Druzin; Merab Kokaia; Umeå universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; chloride concentration; current-voltage relation; interpolation; voltage ramp; reversal potential; [Cl–]i recovery; KCC2; extracellular matrix; GABAA receptor; chloride leak conductance; neurosteroid; fysiologi; Physiology;

   Sammanfattning : The overall aim of the present thesis is to clarify the control of intracellular chloride homeostasis in central neurons, because of the critical role of chloride ions (Cl–) for neuronal function. Normal function of the central nervous system (CNS) depends on a delicate balance between neuronal excitation and inhibition. LÄS MER

3. 2. Electrical remodeling in arial fibrillation - assessment using surface electrocardiograms, prognostic implications and potential reversal

   Författare :Andreas Bollmann; Kardiologi; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; atrial fibrillation; electrocardiography; stroke; biomarkers;

   Sammanfattning : The fibrillatory rate of the surface ECG during atrial fibrillation (AF) has been suggested for quantification of the individual atrial remodeling, to monitor interventions and to predict the response to different therapies. In this dissertation, the relation between fibrillatory rate of the surface ECG and (1) clinical and echocardiographic variables, (2) the outcome of cardioversion, (3) circulating markers of inflammation and hemostasis, (4) the risk of left atrial thrombus formation, (5) the risk of stroke, and (6) the effects of candesartan on the fibrillatory rate were investigated in human persistent atrial fibrillation (AF). LÄS MER

4. 3. Synchronous Voltage Reversal Control of Thyristor Controlled Series Capacitor

   Författare :Lennart Ängquist; KTH; []
   Nyckelord :ThyristorControlled Series Capacitor; TCSC; FACTS; reactive power compensation; boost control; phasor estimation; Quantitative Feedback Theory; subsynchronous resonance; SSR;

   Sammanfattning : Series compensation of transmission lines is an effectiveand cheap method of improving the power transmission systemperformance. Series capacitors virtually reduces the length ofthe line making it easier to keep all parts of the power systemrunning in synchronism and to maintain a constant voltage levelthroughout the system. LÄS MER

5. 4. Modeling mesoscopic unconventional superconductors

   Författare :Patric Holmvall; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; phase transitions; Andreev bound states; quasiclassical theory; mesoscopic thin-films; spontaneous symmetry breaking; time-reversal symmetry; Unconventional superconductivity; translational symmetry;

   Sammanfattning : High-temperature superconducting materials are often experimentally realized as thin films that can be patterned into devices operating in the mesoscopic regime. On this length scale, various finite-size and surface effects heavily influence the nature of the superconducting state, and can induce new ground states with spontaneously broken symmetries. LÄS MER

7. 5. Crystallization of the superconducting phase in unconventional superconductors

   Författare :Patric Holmvall; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; pattern formation; spontaneous symmetry breaking; Andreev bound states; mesoscopic superconductivity; phase crystals; thin superconducting films; phase transitions; non-local Ginzburg-Landau theory; time-reversal symmetry; flat bands; unconventional superconductivity; quasiclassical theory; translational symmetry; cuprates; inhomogeneous superconductivity;

   Sammanfattning : Superconductivity is a macroscopic quantum phenomenon, in the sense that a macroscopic number of electrons form a pair condensate, that occupies a single ground state. The electrons in this state are phase-coherent, breaking global U (1)-symmetry, and spatial variations of the phase imply superflows that usually cost kinetic energy, resulting in a uniform and rigid phase. LÄS MER