Sökning: "PD measurement"
Visar resultat 16 - 20 av 41 avhandlingar innehållade orden PD measurement.
16. Motor and cognitive abilities in Parkinson’s disease with a brain activity perspective : performance at baseline and the effects of a balance training program
Sammanfattning : Background: Around one per cent of the population over 60 years of age have Parkinson’s disease (PD). PD is a progressive and complicated disease presenting a wide range of symptoms. More knowledge of the common impairments in balance, gait, cognition, and motor learning is needed. LÄS MER
17. Effect of HV Impulses on Partial Discharge Activity in Oil-Impregnated Paper Insulation
Sammanfattning : High voltage (HV) transients in electrical power systems are mainly caused by lightning strikes and switching operations. The high voltage transient from its point of origin can propagate in either direction in the electrical power transmission line, and if its magnitude would be below the Basic Insulation Level (BIL) of the equipment for impulse voltage, it can reach the terminals of the equipment without being dissipated by surge arresters. LÄS MER
18. Diagnostics of stator insulatin by dielectric response and variable frequency partial discharge measurements : a study of varied low frequencies in stator insulation, with particular attention to end-winding stress-grading
Sammanfattning : Stator insulation is a critical to the reliability of electrical generators and motors. It is common industrial practice to use electrical measurement of partial discharges (PD) and some form of current-voltage measurement as part of the condition assessment of stator insulation at maintenance times. LÄS MER
19. Partial Discharge Analysis at Arbitrary Voltage Waveform Stimulus
Sammanfattning : Partial discharge (PD) detection is widely used to diagnose the defects and degradation in an electrical insulation system. Generally, PD are measured with 50 Hz AC sinusoidal voltage in the on-line situation, but can also be detected at other voltage stimulus in some off-line situations. LÄS MER
20. Development of combined operando diagnostics : Applications in heterogeneous catalysis and electrochemistry
Sammanfattning : With the aim to bridge the pressure gap between traditional surface science and industrial applications, heterogeneous catalytic reactions on model catalysts are increasingly studied at near-ambient pressures. Under those conditions, the gas phase has been shown to play an important role during the interaction at the gas-surface interface making it complex to study. LÄS MER
