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Träfflista för sökning "Nicaragua ;mspu:(conferencepaper);srt2:(2000-2004)"

Sökning: Nicaragua > Konferensbidrag > (2000-2004)

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  • Korsak, Larisa, et al. (författare)
  • Wastewater treatment in Nicaragua
  • 2003
  • Ingår i: Proceedings of the 9th Annual IWA Specialised Conference "Design, Operation and Economics of Large Wasewater Treatment Plants".
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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  • Parrales, Rainer, et al. (författare)
  • Site investigation with combined methods in a faulted area in Managua, Nicaragua - a pre-study
  • 2003
  • Ingår i: Procs. 9th Meeting Environmental and Engineering Geophysics, Prague, Czech Republic, 31 August-4 September 2003.
  • Konferensbidrag (refereegranskat)abstract
    • Geophysical methods are increasingly being applied to geotechnical investigations, as they can identify material properties and material boundaries, as well as variations in space and time of relatively large volumes of soil. Another advantage is that many of these methods are non-intrusive. The combination of several methods and the verification of their results by sampling and correlating with geotechnical methods are advisable in order to improve the reliability of geophysical investigations. In this case we used the following geophysical methods; combined resistivity and time domain induced polarisation (IP) two-dimensional imaging (CVES), seismic refraction plus multi-channel analysis of surface waves (MASW). The geophysical results are compared to a geologically documented trench, which had been dug 5m south of the geophysical line with a N65°W orientation. The trench intercepted an active fault zone. The geological study determined that the intercepted fault zone corresponds to the Escuela Fault System, one of a many of the complex faulting system within the so-called Managua Graben.
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  • Somarriba Jarquín, Oscar (författare)
  • On Constrained Power Control for Spatial TDMA in Multi-hop Ad Hoc Radio Networks
  • 2002
  • Konferensbidrag (refereegranskat)abstract
    • A very attractive alternative for communications in areas in which there is little or no telecommunications infrastructure is to use Multi-hop packet radio networks (MPRNet:s). One major design issue in MPRNet:s is the formulation of Medium Access Control (MAC) protocols. Spatial TDMA (S-TDMA) is a `conflict-free' multiple access for MPRNet:s, which ensures that a packet transmission, whenever made, is successful . Since the transmitter power is at a premium in wireless systems, it is important to utilize it in an efficient way. High S-TDMA system capacities can be achieved by incorporating traffic load information into the MAC protocol design. However, the impact of power control in traffic-sensitive Spatial TDMA schemes control has not received enough attention in the literature. A suitable power control scheme has been chosen and applied to S-TDMA. The resulting delay performance, as determined via network simulations, is presented in this paper. As would be expected the introduction of power control markedly improved the delay performance of Traffic Sensitive S-TDMA.
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