Level crossing rate, outage probability and average time of fade duration of the SSC combiner output signal are determined in this paper. The presence of log-normal fading at the input is observed. The results are shown graphically for different variance values, decision threshold values and fading parameters. Key-Words: Diversity reception, Fade Duration, Level Crossing Rate, Log-normal fading...

Stress in piezoelectric material can be controlled by imposing the electrical field. Thanks to a feedback, this electrical field can be a function of some strain related measurement so as to confer to the piezoelectric device a closed loop macroscopic behaviour. In this paper we address the modelling of such system by extending the modal decomposition methods to account for the closed loop. To ...

In recent years wind energy has been the world’s fastest growing source of energy. The wind turbine industry is booming and is spending a lot on research for improving the performance of its present machines and increasing their capacity. However, upscaling of the classical drivetrain concept is no longer economically feasible for machine power of 2 MW and higher. This paper presents the prelim...

IP-based sensor networks provide interoperability, but experience shows that interoperability between different protocol implementations is not a binary property. Instead, subtle differences in implementation choices may affect the performance of the resulting system. We present our experiences with the Contiki and TinyOS implementations of the IPv6 stack for low-power and lossy (LLN) networks ...

Unlike most research involving nite eld multipliers, this work targets a low-power multiplier through the application of various power reduction techniques to di erent types of multipliers and comparing their power consumption among other factors, rather than comparing complexity measures such as gate count or area. Gate count is used as a starting point to choose potential architectures, namel...

An !-word p over a nite alphabet is called disjunctive if every nite word over occurs as a subword in p. A real number is called disjunctive to base a if it has a disjunctive a-adic expansion. For every pair of integers a; b 2 such that there exist numbers disjunctive to base a but not to base b we explicitly construct very simple examples of such numbers. General versions of the following resu...

We study the statistics of soft gamma repeater (SGR) bursts using a database of 187 events detected with BATSE and 837 events detected with the Rossi X-Ray Timing Explorer Proportional Counter Array; all events are from SGR 1900+14 during its 1998-1999 active phase. We find that the fluence or energy distribution of bursts is consistent with a power law of index 1.66, over 4 orders of magnitude...

Knowing whether a proposition is true means knowing that it is true or knowing that it is false. In this paper, we study logics with a modal operator Kw for knowing whether but without a modal operator K for knowing that. This logic is not a normal modal logic, because we do not have Kw(φ → ψ) → (Kwφ → Kwψ). Knowing whether logic cannot define many common frame properties, and its expressive po...

Supported by the European Commission, the EVIDOS project started in November 2001 with the broad goal of evaluating state of the art dosimetry techniques in representative workplaces of the nuclear industry. Seven European institutes joined efforts with end users at nuclear power plants, at fuel processing and reprocessing plants, and at transport and storage facilities. A comprehensive program...