Uplink beamforming for the FDD mode of UTRA

This paper presents some link level simulation results for the evaluation of adaptive antennas in the uplink of the FDD mode of UTRA (UMTS terrestrial radio access). Two families of algorithms were initially considered, the basic difference between them being their ability/disability to suppress the contribution from W-CDMA directional interfering sources. Two distinct schemes were established as representatives for each family and their performance was evaluated in presence of some illustrative interfering scenarios. In the light of the results it is shown that time-reference beamforming algorithms suffer from severe beam pattern distortion effects when applied as such. This in turn causes harsh performance degradation in terms of raw BER, especially at high SINR levels. It is shown that these shortcomings are essentially caused by the uplink multiplexing of the traffic channel, which is seen by the base station as a powerful interfering source coming from the direction of arrival of the desired user.Peer ReviewedPostprint (published version

Ditylomorphula brendelli n. sp. and new data on the genus Ditylon?orphula in Southern Africa (Coleoptera, 0edemeridae)

A new species, Ditylomorphula brendelli n. sp., from northern Namib Desert (Angola) is described and illustrated. It is similar to D. espanyoliVázquez and D. marginipennis (Blair), from which it differs mainly by wider interocular area, pronotum not paler than elytra, median lobe evenly arcuate and not bent dorsally at apex, tegmen bent ventrally and parameres shortly and sparsely pubescent. In addition, the female of Ditylomorphula marginipennis is described for the first time on the basis of type material, and new data on the geographical distribution of Colobostomoides marshalli (Blair) and Ditylomorphula subfasciata (Blair) are given. Finally, some zoogeographical reflections are given and four chorotypes are proposed for the Southern African Oederneridae, based on the floristical regions currently recognised. Key words: Oedemeridae, Ditylomorphula brendelli n. sp., Zoogeography, Namib Desert, Afrotropical RegionA new species, Ditylomorphula brendelli n. sp., from northern Namib Desert (Angola) is described and illustrated. It is similar to D. espanyoliVázquez and D. marginipennis (Blair), from which it differs mainly by wider interocular area, pronotum not paler than elytra, median lobe evenly arcuate and not bent dorsally at apex, tegmen bent ventrally and parameres shortly and sparsely pubescent. In addition, the female of Ditylomorphula marginipennis is described for the first time on the basis of type material, and new data on the geographical distribution of Colobostomoides marshalli (Blair) and Ditylomorphula subfasciata (Blair) are given. Finally, some zoogeographical reflections are given and four chorotypes are proposed for the Southern African Oederneridae, based on the floristical regions currently recognised. Key words: Oedemeridae, Ditylomorphula brendelli n. sp., Zoogeography, Namib Desert, Afrotropical RegionA new species, Ditylomorphula brendelli n. sp., from northern Namib Desert (Angola) is described and illustrated. It is similar to D. espanyoliVázquez and D. marginipennis (Blair), from which it differs mainly by wider interocular area, pronotum not paler than elytra, median lobe evenly arcuate and not bent dorsally at apex, tegmen bent ventrally and parameres shortly and sparsely pubescent. In addition, the female of Ditylomorphula marginipennis is described for the first time on the basis of type material, and new data on the geographical distribution of Colobostomoides marshalli (Blair) and Ditylomorphula subfasciata (Blair) are given. Finally, some zoogeographical reflections are given and four chorotypes are proposed for the Southern African Oederneridae, based on the floristical regions currently recognised. Key words: Oedemeridae, Ditylomorphula brendelli n. sp., Zoogeography, Namib Desert, Afrotropical Regio

Numerical modeling and measurement by pulsed television holography of ultrasonic displacement maps in plates with through-thickness defects

We present a novel numerical modeling of ultrasonic Lamb and Rayleigh wave propagation and scattering by through-thickness defects like holes and slots in homogeneous plates, and its experimental verification in both near and far field by a self-developed pulsed TV holography system. In contrast to rigorous vectorial formulation of elasticity theory, our model is based on the 2-D scalar wave equation over the plate surface, with specific boundary conditions in the defects and plate edges. The experimental data include complex amplitude maps of the out-of-plane displacements of the plate surface, obtained by a two-step spatiotemporal Fourier transform method. We find a fair match between the numerical and experimental results, which allows for quantitative characterization of the defects

Las especies del Talud: un recurso mal conocido y poco explotado

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Peces de fondo de interés comercial: los peces sable

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Spatial pattern and temporal evolution of glacial terminations of the last 800 ka

The second QUIGS workshop brought together 28 delegates to assess current knowledge and research needs on the spatio-temporal patterns of climate forcing, responses and feedbacks that characterize glacial terminations, i.e. transitions between glacial and interglacial periods

Porous medium equation with nonlocal pressure

We provide a rather complete description of the results obtained so far on the nonlinear diffusion equation $u_t=\nabla\cdot (u^{m-1}\nabla (-\Delta)^{-s}u)$, which describes a flow through a porous medium driven by a nonlocal pressure. We consider constant parameters $m>1$ and $0<s<1$, we assume that the solutions are non-negative, and the problem is posed in the whole space. We present a theory of existence of solutions, results on uniqueness, and relation to other models. As new results of this paper, we prove the existence of self-similar solutions in the range when $N=1$ and $m>2$, and the asymptotic behavior of solutions when $N=1$. The cases $m = 1$ and $m = 2$ were rather well known.Comment: 24 pages, 2 figure