This paper presents a simple control method for controlling permanent magnet synchronous motors (PMSM) in a wide speed range without a shaft sensor. The method estimates the stator flux by integration of the measured BEMF signal. To compensate for the offset in the BEMF the offset is estimated. The control method is made robust at zero and low speed by changing the direct vector current compone...

Network one-way transit time is one of the principal factors affecting network QoS. It is therefore important to measure it with sufficient accuracy. The measurements of network one-way transit time should not include host effects (time spent of the measurement hosts themselves) but be entirely attributable to delays incurred on the network. Furthermore, the measurements of network oneway trans...

The second data release of \it Gaia \rm revealed a parallax zero point offset $-0.029$~mas based on quasars. value depended the position sky, and also likely magnitude colour. its dependence other parameters inhibited an improvement in local distance scale using e.g. Cepheid RR Lyrae period-luminosity relations. Analysis recent Early Data Release 3 (EDR3) reveals mean $-0.021$~mas team addresse...

This paper is an enquiry into the logical, metaphysical, and physical possibility of time travel understood in the sense of the existence of closed worldlines that can be traced out by physical objects. We argue that none of the purported paradoxes rule out time travel either on grounds of logic or metaphysics. More relevantly, modern spacetime theories such as general relativity seem to permit...

An extended model-based predictive control scheme is proposed and implemented on a bench three-tanks system. This structure is based on a constrained local instantaneous linear model-based predictive controller complemented with a static offset compensator for guaranteeing that tracking errors converge to zero in a finite time. A non-linear state-space neural network architecture trained offlin...

This paper describes a study of daily personal travel time in the Minneapolis-St.Paul, Minnesota metropolitan area and how and why it changed between 1990 and 2001.This has two major components. The first is the relationship between commute and non-commute travel time. The second is the relationship between mode choice, total dailytravel time, and automobile travel time. Bot...