Two-dimensional, relativistic, MHD simulations of pulsar-wind powered nebulae provide strong constraints on the properties of the winds themselves. In particular, they confirm that Poynting flux must be converted into particle energy close to or inside the termination shock front, emphasising the puzzle known as the σ paradox. To distinguish between the different possible resolutions of this pa...

AbstTactThis paper presents a technique for computing the probability that f of m transmissions will be collisionfree at a given receiver in a spread-spectrum multiple-access (SSMA) radio network in which all transmitters employ identical wideband symbol waveforms for signalling. Separation of signals (collision-freedom) is based on the fine timeresolution characteristics of pulse compression r...

A new picosecond pulse radiolysis system for the absorption spectroscopy to observe ultra fast phenomena was developed. The system was composed of a 38 MeV picosecond electron L-band linac for the irradiation source and a femtosecond laser system for the analyzing light. The laser pulse was synchronized with the electron pulse by using the common radio frequency. The timeresolution of the syste...

Short-term Time Structure of Cochlear Filtered Sound Leslie S. Smith CCCN, Dept. of Computing Science and Mathematics, University of Stirling Stirling FK9 4LA, Scotland. Abstract Auditory modelling uses the architecture of the auditory system to guide early sound processing. The advantage of this approach is (i) timeresolution is better and (ii) many bandpassed channels are available and can be...

Ground-based microwave radiometry offers a new opportunity to automate upper air observations by providing information on temperature and humidity profiles as well as the integrated water vapour and liquid water amounts with high time resolution. To improve their relatively poor vertical resolution and provide a more complete picture of the vertical profile, radiometer observations can be combi...

The VHF radar system at Aberystwyth (52:4 N, 4:1 E) has been used to make high-timeresolution, multi-beam observations of mesospheric summer echo layers. These show that the altitude and the sense of vertical movement of the layers can vary over time-scales of minutes and horizontal scales of kilometres. In general, the altitude pro®les of signal-tonoise ratio provide evidence of a bifurcated s...

Simultaneous multi -s l ice (SMS) MRI al lows for the acquisi tion of several s l ices at the same time. We propose a novel reconstruction technique for radial SMS MRI based on Regularized Nonl inear Inversion (NLINV). This method does not require a priori knowledge of the coi l sensitivi ties. We present the simultaneous estimation of images and coi l sensitivi ties of two sl ices of a phantom...

Abstract: The risks of alternating current (AC) corrosion and overprotection increasingly demand new criteria forcathodically protected pipelines. To assess the risk of AC corrosion, new cathodic protection (CP) criteria have beenproposed based on DC/AC current densities measurements using coupons. The monitoring system designed for thisproject was based on the instant-off method, with steel co...

We present the characteristics of the response of equatorial ionospheric zonal electric ®eld and Fregion plasma density to the asymmetric ring current intensi®cations that occurred in succession on 16 December 1991, corresponding to the STEP/EITS-2 campaign period. The study is based on high-timeresolution (1-min) data of asymmetic ring current indices, ASY(H/D) and F-region vertical plasma dri...

We present a spectrophotometric study of short-term optical variability in the quiescent black hole X-ray transient V404 Cyg. This includes two nights of high timeresolution Hα spectroscopy with which we resolve much of the time-variability, and a further six nights of archival spectroscopy with lower time-resolution but higher spectral-resolution. We find significant variability in most of the...