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Consequences of Dynamic Yield Surface in Viscoplasticity

A theory of viscoplasticity is formulated within a thermodynamic concept. The key point is the postulate of a dynamic yield surface, which allows us to take advantage of the postulate of maximum dissipation to derive an associated formulation of the evolutions laws for the internal variables without using penalty techniques that only hold in the limit it when viscoplasticity degenerates to invisci

Impact of mutual inductance and parasitic capacitance on the phase-error performance of CMOS quadrature VCOs

This paper examines the impact of mutual inductance and parasitic capacitance on the phase-error performance for a class of CMOS quadrature voltage-controlled oscillators (QVCOs). Good agreement is found between theory, post-layout simulations, and measurement results. The QVCOs were implemented in a standard 0.35/spl mu/m CMOS process. All QVCOs display a center frequency of 2 GHz and a tuning ra

Motorcyclists’ road safety related behavior along primary roads in Malaysia – a case study

Majority of Malaysian motorcycle fatalities have occurred along straight road sections, which are mostly two-lane undivided roads with several small junctions or access points. In order to gain more insight into the actual road traffic situation and the course of events on these sites because, an observational and traffic conflict study, focusing on motorcyclists, was conducted by the author betwe

Regional cerebral blood flow in long-term heavy cannabis use

Regional cerebral blood flow (rCBF) was measured by the 133Xenon inhalation method in nine male chronic cannabis users. The rCBF level in cannabis users was significantly (11%) lower than that of age- and sex-matched healthy controls. Four of the subjects were reexamined after 9-60 days of detoxification and showed a significant (12%) increase of the CBF level at followup. No significant regional

Custom Silicon Implementation of a Delayless Acoustic Echo Canceller Algorithm

This paper presents a hardware implementation of a high quality acoustic echo canceller for use in handsfree telecommunication systems. The implementation is based on an algorithm with no delay in the signal path, attractive for communication systems where low delay is crucial. However, a zero delay algorithm has higher complexity compared to other canceller solutions. A custom silicon implementat