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Sökning: WFRF:(Gustafsson Mats) > Konferensbidrag

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  • Nordebo, Sven, et al. (författare)
  • Wave modeling and fault localization for underwater power cables
  • 2011
  • Ingår i: 2011 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC). - : IEEE Press. - 9781457700460 ; , s. 698-701
  • Konferensbidrag (refereegranskat)abstract
    • This paper describes some preliminary results regarding Time-Domain pulse Reflection (TDR) measurements and modeling performed on the Baltic Cable submarine HVDC link between southern Sweden and northern Germany. The measurements were conducted in collaboration between the Linnaeus University, Lund University, Baltic Cable AB and ABB High Voltage Cables AB, and is part of the research project: “Fundamental wave modeling for signal estimation on lossy transmission lines”. Preliminary results on measurements and modeling are included here, as well as a first numerical study regarding the low-frequency dispersion characteristics of power cables. The numerical study shows that the finite conductivity of the cable lead shield has a great impact on the losses at low frequencies (0-1 kHz), and that the low-frequency asymptotics of the propagation constant is consistent with common propagation models based on the skin-effect.
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  • Ågren, Thomas, et al. (författare)
  • Effective Connectivity of Fear Circuitry and Emotion Regulation in Specific Phobia
  • 2011
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • Background: The aim of the present study was to characterize effective brain connectivity patterns in patients with specific phobia. Methods: Sixteen patients with specific phobia were exposed to phobic and fear-relevant but non-phobic stimuli while regional cerebral blood flow was measured using [15O]-labelled water and positron emission tomography. Self reported state anxiety was also evaluated using the Spielberger State Anxiety Inventory (STAI-S). Different connectivity architectures were built based on five regions of interest (ROIs): the amygdala; subgenual anterior cingulate cortex (sACC) area 25; anterior midcingulate cortex (aMCC) area 24; insular cortex and dorsolateral prefrontal cortex (DLPFC) area 8. The ROIs were chosen based on their role in generating and attenuating fear. Structural equations modelling and Bayesian inference were used to assign probabilities to all possible architectures. Results: Top ranking models reveal different connectivity patterns resulting from phobic and non-phobic exposure. When exposed to phobic stimuli sACC appear to be driving the network. In contrast, when exposed to non-phobic stimuli the DLPFC is more active and dampen amygdala activity. This could reflect successful reappraisal processes during non-phobic exposure. The DLPFC correlated negatively (r=-0.49) with STAI-S during non-phobic exposure, but not phobic exposure also suggesting that emotional regulation fails in phobia. No direct correlation between amygdala activity and STAI-S was evident during either phobic or non-phobic conditions. Conclusions: These results suggest that emotional control processes operative when exposed to fear-relevant, but non-phobic cues are impaired during exposure to phobic stimuli.
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  • Alayon Glazunov, Andres, et al. (författare)
  • Branch cross-correlation in presence of spatially selective interference expressed in terms of the spherical vector wave expansion of the electromagnetic field
  • 2008
  • Konferensbidrag (refereegranskat)abstract
    • In this paper we present an analysis of the cross-correlation coe±cient between signals at two antennabranches (ports) in the presence of spatially selective interference and additive white gaussian noise. Morespeci¯cally, we look at a §45± slanted polarization diversity arrangement, which is rotated around the axisperpendicular to the plane containing the antennas. Results are provided as a function of the rotation angle.The analysis is based on the spherical vector wave multi-pole expansion of both the ¯eld impinging on theantennas and the antenna radiation properties.
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  • Alayon Glazunov, Andres, et al. (författare)
  • On the mean effective gain expressed in terms of the spherical vector wave expansion of the electromagnetic field
  • 2008
  • Konferensbidrag (refereegranskat)abstract
    • The mode expansion o®ers a general framework for the analysis of the interaction between antennas andpropagation channels. In this paper, the Mean E®ective Gain (MEG) of an antenna is expressed in termsof the spherical vector wave expansion of the electromagnetic ¯eld. An explicit expression of the MEG isprovided as a function of the normalized average power of modes excited in the propagation channel andthe correlation between the channel modes due to the polarization and spatial selectivity of plane wavesimpinging at the antenna.
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