The Doctor Magnet

THESIS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY Control of Permanent-Magnet Synchronous Machines in Automotive Applications

This thesis deals with the design and analysis of control system structures for electric drives equipped with permanent-magnet synchronous machines (PMSMs) in automotive applications. Sensorless control, meaning vector control without a mechanical rotor position sensor, is considered and a speed and position estimator of phase-locked loop type is analyzed thoroughly. Modifications are proposed ...

The doctor.

Follow-Up Visits in Doctor-Patient Communication: The Vietnamese Case

In a “follow-up visit”, a patient seeks medical attention for an existing health problem. Using data from the Vietnamese public hospital system, we present a more nuanced analysis of follow-ups in health communication than the one currently available. To be specific, we discriminate between “same follow-ups”, in which the doctor is the same one as in the last visit, and “different follow-ups”, ...

MRI without the magnet.

T here is no doubt that magnetic resonance imaging (MRI) has had an enormous impact in science and medicine. Dating back to the initial ‘‘zeugmatography’’ work of Paul Lauterbur (1) and echo-planar imaging by Peter Mansfield (2) in the 1970s that resulted in their 2003 Nobel Prize, MRI has undergone dramatic progress over the ensuing years (3). For example, functional MRI is being widely used t...

The Magnet and the Butterfly

Some of the formal tools rst developed in the sixties to make rigorous the theory of phase transitions in statistical mechanics have turned out to be \unreasonably eeective" in the study of chaotic dynamical systems. The evolution over three decades of this fruitful, ongoing, reciprocal innuence between theoretical physics and mathematics is brieey evoked, while a selection of ideas at the hing...