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Voice-coil actuators are the simplest form of electric motor consisting of a non-commutated single coil or winding moving through a fixed magnetic field produced by stationary permanent magnets. From a system design point of view, however, it is generally the end user's responsibility to couple the voice-coil actuator with a linear bearing system, position feedback device, switch-mode or linear servo...
This paper describes the design and development of a collaborative learning space for addressing the conceptual problems of students when learning to model Entity-Relationship Diagrams (ERDs). The research methodology is a Design Science Research Process, focusing on the initial stages of establishing the specific nature of problems student experience with ERDs. Empirical data on the specific nature...
Future space exploration may involve communications between spacecraft moving at relativistic velocities. One of the significant problems associated with such communication is spectral distortion of signals which are propagated between relativistic frames. This distortion is generated by both changing propagation distances and purely relativistic electromagnetic field transformations. In this paper...
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