The origins and development of human cognition constitute one of the most interesting questions to which archaeology can contribute today. In this paper, we do so by presenting an overview of the evolution of artefact technology from the maker's point of view, and linking that development to some hypotheses on the evolution of human cognitive capacity. Our main hypothesis is that these data ind...

The AVHS architecture of the California PATH program organizes traffic into platoons of closely spaced vehicles. Platoons are formed and broken up by two longitudinal control maneuvers, merge and split. A third longitudinal maneuver, decelerate to change lanes, allows a platoon switching from one lane to another to enter its new lane at a safe spacing and speed. This paper presents a robust con...

While Moore’s law continues to hold true, limits on the electrical distance between CPU core components have forced the maximum operating frequency of the CPU core to plateau. CPU vendors have introduced acceleration features to compensate for this frequency limit; however, these acceleration features are limited in their design because they cannot be tuned to target a specific high-level softw...

This paper presents the influence of nonlinear terms of a previously proposed constitutive piezoelectric equation on the dynamics of a cantilever aluminium beam with a piezoelectric unimorph PZT (MIDE QP16N) attached to it. The system is subjected to different levels of base acceleration with the intention to evidence the limits of the linear model. To carry out the analysis, a one-dimensional ...

Abstract. In this paper, the minimum time feedrate trajectory planning problem for five-axis computer numerical control (CNC) machining is studied. A more accurate model for the feedrate trajectory planning problem is proposed by constraining the velocity, acceleration, and jerk for all five axes in the joint space and constraining the chord error in the workpiece coordinate system. For the new...

The origin of Galactic cosmic rays is still a burning question that forms a major motivation for developments in ground-based gamma-ray astronomy. SNRs are long-thought to be sites for the acceleration of Galactic cosmic rays, and evidence for gamma-ray and non-thermal X-ray production from some SNRs suggest that they may be capable of accelerating particles to multi-TeV energies. Yet, along wi...

Fluorescence molecular tomography (FMT) with early-photons can improve the spatial resolution and fidelity of the reconstructed results. However, its computing scale is always large which limits its applications. In this paper, we introduced an acceleration strategy for the early-photon FMT with graphics processing units (GPUs). According to the procedure, the whole solution of FMT was divided ...

We obtain a theory describing laminar shock-like structures in a collisionless plasma and examine the parameter limits, in terms of the ion sound Mach number and the electron/ion temperature ratio, within which these structures exist. The essential feature is the inclusion of …nite ion temperature with the result that some ions are re‡ected from a potential ramp. This destroys the symmetry betw...

Supernova remnants are widely believed to be a principal source of galactic cosmic rays, produced by diffusive shock acceleration in the environs of the remnant’s expanding shock. This review discusses recent modelling of how such energetic particles can produce gamma-rays via interactions with the remnants’ ambient interstellar medium, specifically via neutral pion decay, bremsstrahlung and in...

Intraobserver variation associated with the non-invasive assessment of pulmonary artery pressure (PAP), using measurement of pulmonary artery Doppler derived systolic time intervals, was investigated. Forty pairs of independent ultrasound examinations of the pulmonary artery were performed by a single observer in 20 preterm infants, median gestation 27 weeks (range 24-31 weeks). Median age at s...