55 research outputs found
High Input Voltage, Silicon Carbide Power Processing Unit Performance Demonstration
A silicon carbide brassboard power processing unit has been developed by the NASA Glenn Research Center in Cleveland, Ohio. The power processing unit operates from two sources - a nominal 300-Volt high voltage input bus and a nominal 28-Volt low voltage input bus. The design of the power processing unit includes four low voltage, low power supplies that provide power to the thruster auxiliary supplies, and two parallel 7.5 kilowatt power supplies that are capable of providing up to 15 kilowatts of total power at 300-Volts to 500-Volts to the thruster discharge supply. Additionally, the unit contains a housekeeping supply, high voltage input filter, low voltage input filter, and master control board, such that the complete brassboard unit is capable of operating a 12.5 kilowatt Hall Effect Thruster. The performance of unit was characterized under both ambient and thermal vacuum test conditions, and the results demonstrate the exceptional performance with full power efficiencies exceeding 97. With a space-qualified silicon carbide or similar high voltage, high efficiency power device, this design could evolve into a flight design for future missions that require high power electric propulsion systems
Development and testing of a synthetic oligonucleotide probe for the detection of pathogenic Yersinia strains
Circadian rhythm with acrophase at night for urinary excretion of calcium and magnesium in childhood: Population-based data of the Cimitile study in southern Italy
Renal excretion of calcium, oxalate and magnesium between 3 and 16 years: the value of overnight urine. The Cimitile Study.
A cohort study of how faculty in LIS schools perceive and engage with open-access publishing
Enumeration by DNA colony hybridization of virulent Yersinia enterocolitica colonies in artificially contaminated food
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