In this paper we show that every real-time system speciied in a certain subset of Duration Calculus 24] can be decomposed into an untimed system communicating with suitable timers. Both asynchronous and synchronous communication are considered.

The spin dynamics in Ni is studied by an exact diagonalization method on the ultrafast time scale. It is shown that the femtosecond relaxation of the magneto-optical response results from exchange interaction and spin-orbit coupling. Each of the two mechanisms affects the relaxation process differently. We find that the intrinsic spin dynamics occurs during about 10 fs while extrinsic effects s...

We present a complete axiomatisation of the operator of projection onto state in the Duration Calculus (DC ) relative to validity in DC without extending constructs. Projection onto state was introduced and studied extensively in our earlier works. We first establish the completeness of a system of axioms and proof rules for the operator relative to validity in the extension of DC by neighbourh...

Among the possible approaches for expressing real-time problems with the B method, two are dominant : the use of the usual B mechanisms to define temporal constraints on one hand, and extending B through another formalism more adapted to the real-time context. We define here a possible temporal semantic for B, by using a temporal logic (the duration calculus), and we illustrate how this extensi...

in order to evaluate the impact of different amounts of nitrogen fertilizer on growth and yield of two forage sorghum cultivars, a 2-year field experiment was carried out at the college of agriculture, shiraz university, shiraz, iran during 2010 and 2011 growing seasons. two factorial experiments were carried out in randomized block design with three replicates, in which the treatments included...

We present a spatial and temporal logic based on Duration Calculus for the specification and verification of mobile real-time systems. We demonstrate the use of the formalism and apply it to a case study. We extend a pure Duration Calculus specification for the controller by spatial assumptions to reason about spatial system properties. We prove that the formalism is undecidable in general for ...

In this paper we present the main achievements of UNU/IIST during the project “Design Techniques for Real-time Systems” carried out since 1993 by its staff and fellows. Duration Calculus was originally introduced in 1991 as a powerful logic for specifying the safety of realtime systems. During the project, it has evolved to a set of calculi that can capture many important aspects in real-time s...

The reduction of electrode wear is very important for high finish and high accuracy machining in microEDM. Electrically conductive CVD diamond has shown almost zero electrode wear, even at short pulse duration of 3μs, which is extremely important for maintaining the desired shape. This research involves an investigation into the EDM performance of the electrically conductive CVD diamond with re...

K. W. Madison, P. K. Patel, M. Allen, D. Price, R. Fitzpatrick, and T. Ditmire Department of Physics, The University of Texas at Austin, Austin, Texas 78712, USA Physics and Advanced Technology Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, USA Department of Nuclear Engineering, University of California at Berkeley, Berkeley, California 94720, USA (Received 14...

In this paper, we first investigate the power spectral densities (PSD) of bipolar modulated Direct Sequence Ultra Wide Band (DS-UWB) signals using various pulse shapes under the FCC UWB emission mask. Considered pulse shapes are the first five derivatives of the Gauss pulse (p1, p2, p3, p4 and p5), the first four orthogonal modified Hermite waveforms, and Daubechies wavelets (db-q). It is obser...