Strong gap-junctional coupling can synchronize the electrical oscillations of cells, but we show, in a theoretical model, that weak coupling can phase lock two cells 180 degrees out-of-phase. Antiphase oscillations can exist in parameter regimens where in-phase oscillations break down. Some consequences are (i) coupling two excitable cells leads to pacemaking, (ii) coupling two pacemaker cells ...

The practical implementation of the infinite-dimensional optimal estimation results presented in Part I of this series is considered. Several techniques are described in detail. Included among these is the so-called “assumed density” approximation technique. Finite-dimensional suboptimal filtering equations based on this method are derived for several of the phase-tracking/demodulation problems...

The performance of a code tracking loop for a spread spectrum signal can be severely deteriorated in the presence of an interference signal. The interference signal is modeled as a signal with the same code but with a different delay and carrier frequency. The variance of the tracking delay error is derived in terms of loop bandwidth, chip duration, the interference and signal power and bandpas...

The temperature dependence o f the 81Br spin-lattice relaxation times for Cs2CdBr4 and Cs2HgBr4 was measured in the low temperature and the commensurate phases. For the com m en­ surate phase o f Cs2CdBr4 rapid shortening o f the T, o f vB ~ vc was observed on approaching the “lock-in” transition point. It is probably due to an anisotropic critical fluctuation. On the other hand, T, in the low ...

2014 Optical microscopy reveals regular periodic undulations of the lateral position of the axes of paired disclinations or « oily streaks » in thin, fully hydrated lyotropic liquid crystals of dimyristoyl phosphatidylcholine (DMPC) in the L03B1 (smectic A) phase. These undulations explain the characteristic dark bands that traverse the paired disclinations on observation with crossed polarizer...

There is several application of phase locked loop in the field of communication. It depends on the mixed signal operation. It is capable of fast locking capability. present work based on redesign of the PLL system using 90nm technology process at frequency 1 GHz and the lock time is 179.5 ns and transient analysis of the PLL is simulate between 1ns to 1000ns.it consumes the 179.5 mW power at 1....

In this paper, we present the PR-lock, a prioritized spin-lock mutual exclusion algorithm for real time systems. The PR-lock is a contention-free spin lock, in which blocked processes spin on locally stored or cached variables. In contrast to previous work on prioritized spin locks, our algorithm maintains a pointer to the lock holder. As a result, our spin lock can support priority inheritance...

Highly concurrent and reliable data objects are vital for parallel programming. Lock-free shared data objects are highly concurrent and guarantee that at least one operation, from a set of concurrently executed operations, finishes after a finite number of steps regardless of the state of the other operations. Lock-free data objects provide progress guarantees on the object level. In this paper...