A lthough regadenoson has nearly replaced other vasodilator stressors for single-photon emission computed tomography perfusion imaging, the benefits of regadenoson stress for positron emission tomography (PET) perfusion are less clearly established, particularly in the estimation of absolute stress flow with dynamic PET imaging. In the estimation of absolute flow with dynamic PET, the timing of...

A real-time kernel providing multitasking and timing services is a fundamental component of any real-time system. Timing services, which are crucial to the correct execution of this kind of applications, are usually provided by a real-time clock and timer manager, which is part of the kernel and implements the required functionality on top of the one or more hardware timers. Kernel timing servi...

High-impact frequency comb applications that are critically dependent on precise pulse timing (i.e., repetition rate) have recently emerged and include the synchronization of X-ray free-electron lasers, photonic analogue-to-digital conversion and photonic radar systems. These applications have used attosecond-level timing jitter of free-running mode-locked lasers on a fast time scale within ~10...

The hypothesis that proprioceptive feedback from early portions of a total movement may serve as a cue for the anticipation and timing of a later portion was tested using 48 5s. The right-hand task involved anticipation (with no preview) of the coincidence of a moving and a stationary pointer, and proprioceptive feedback was manipulated by having 5s make a minimal movement or a small or large r...

Process algebra in the form of ACP describes the main features of imperative concurrent programming without explicit mention of time. Implicitly, time is present in the interpretation of sequential composition: in p · q the process p must be executed before q. A quantative view on the relation between process execution and progress of time is absent in ACP, however. Process algebras can be deve...

It is increasingly clear that we extract patterns of temporal regularity between events to optimize information processing. The ability to extract temporal patterns and regularity of events is referred as temporal expectation. Temporal expectation activates the same cerebral network usually engaged in action selection, comprising cerebellum. However, it is unclear whether the cerebellum is dire...

Ultra-wideband (UWB) radio is a promising technology for low-cost, high-rate communications at short ranges. However, high bandwidth and low power of the UWB signals impose some difficult challenges in signal processing and implementation of the receiver. Acquisition of the signal timing is the first task to be performed in a coherent receiver. The high bandwidth of UWB signals demand for fine ...

Context. The X-Ray Telescope (XRT) on board Swift was mainly designed to provide detailed position, timing and spectroscopic information on gamma-ray burst (GRB) afterglows. During the mission lifetime the fraction of observing time allocated to other types of source has been steadily increased. Aims. In this paper, we report on the results of the in-flight calibration of the timing capabilitie...