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Träfflista för sökning "WFRF:(Ye L. L.) srt2:(2000-2004)"

Sökning: WFRF:(Ye L. L.) > (2000-2004)

  • Resultat 1-10 av 29
  • [1]23Nästa
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  • Mahout, G., et al. (författare)
  • Irradiation studies of multimode optical fibres for use in ATLAS front-end links
  • 2000
  • Ingår i: Nuclear Instruments and Methods in Physics Research Section A. - 0168-9002 .- 1872-9576. ; 446:3, s. 426-434
  • Tidskriftsartikel (refereegranskat)abstract
    • The radiation tolerance of three multimode optical fibres has been investigated to establish their suitability for the use in the front-end data links of the ATLAS experiment. Both gamma and neutron irradiation studies are reported. A step-index fibre with a pure silica core showed an induced attenuation of similar to 0.05 dB/m at 330 kGy(Si) and 1 x 10(15) n(1 MeV Si)/cm(2) and is suitable for use with the inner detector links which operate at 40-80 Mb/s. A graded-index fibre with a predominantly germanium-doped core exhibits an induced attenuation of similar to 0.1 dB/m at 800 Gy(Si) and 2 x 10(13) n(1 MeV Si)/cm(2) and is suitable for the calorimeter links which operate at 1.6 Gb/s. Measurements of the dose rate dependence of the induced attenuation indicate that the attenuation in ATLAS will be lower.
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  • Andrieux, M. L., et al. (författare)
  • Single-event upset studies of a high-speed digital optical data link
  • 2001
  • Ingår i: Nuclear Instruments and Methods in Physics Research Section A. - 0168-9002 .- 1872-9576. ; 456:3, s. 342-351
  • Tidskriftsartikel (refereegranskat)abstract
    • The results from a series of neutron and photon irradiation tests of a high-speed digital optical data link based on a commercial serialiser and a vertical cavity surface emitting laser are described. The link was developed as a candidate for the front-end readout of the ATLAS electromagnetic calorimeter. The components at the emitting end of the link were unaffected by neutron and photon irradiation levels exceeding those expected during 10 years of LHC running. However, the link suffered from Single-Event Upsets (SEUs) when irradiated with energetic neutrons. A very general method based on the Burst Generation Rate (BGR) model has been developed and is used to extrapolate the error rate observed during tests to that expected at the LHC. A model-independent extrapolation was used to check the BGR approach and the results were consistent once systematic errors were taken into account.
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4.
  • Jacob, A P, et al. (författare)
  • Cryogenic performance of ultrathin oxide MOS capacitors with in situ doped p(+) poly-Si1-xGex and poly-Si gate materials
  • 2002
  • Ingår i: Semiconductor Science and Technology. - : Iop Publishing Ltd. - 0268-1242 .- 1361-6641. ; 17:9, s. 942-946
  • Tidskriftsartikel (refereegranskat)abstract
    • A low-temperature electrical characterization of ultrathin oxide MOS capacitors with p(+) poly-Si1-xGex and poly-Si gate is performed. The investigated structures are suitable for future nano-scaled high speed MOSFETs. The aim of this study is to compare the low-temperature performance of poly-Si1-xGex and poly-Si gate MOS structures in the nanoscale channel length regime. Apart from the significant change in the flat band voltage, the result shows that all the poly-Si and poly-Si1-xGex gated MOS structures exhibit two centres of polarity change (zero-temperature coefficients) in capacitance. The second polarity change leads to an exclusive phenomenon in these structures. The low-temperature capacitance is found to be less than high-temperature capacitance at strong accumulation and this is in contrast to what has been observed so far in metal-gated capacitors. It is also observed that the temperature dependence of the tunnelling current is only on the oxide thickness and not on the gate material used.
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  • Ye, L L, et al. (författare)
  • Structural roughness and interface strain properties in Si/SiO2/poly-Si1-xGex tri-layer system with ultrathin oxide
  • 2003
  • Ingår i: Journal of materials science. Materials in electronics. - : Springer Science Business Media. - 0957-4522 .- 1573-482X. ; 14:4, s. 247-254
  • Tidskriftsartikel (refereegranskat)abstract
    • We have explored the microstructure and local interface strain in the poly-Si1-xGex/SiO2/Si tri-layer system with ultrathin oxides. High-resolution transmission electron microscopy (HRTEM) and high-resolution X-ray diffraction rocking curves (HR-RC) and two-dimensional reciprocal space mapping (2D-RSM) were the main characterization tools. The poly-Si1-xGex/SiO2/Si structures have x=0, 0.2, and 0.35 for ultrathin oxides (2.0-3.0 nm). The result shows that for the adopted growth process, the poly grain size depends very strongly on the Ge concentration, and it increases with increasing Ge mole fraction. In turn, this increase of the grain size in the poly-Si1-xGex/SiO2/Si reduces the strain in the film, which then affects the interface strain at the lower SiO2/Si interface. In addition, the presence of defects at the SiO2/Si interface was found to be greater for samples with no local interface strain.
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  • Aksoy, Selim, et al. (författare)
  • Algorithm Performance Contest
  • 2000
  • Ingår i: Proceedings. 15th International Conference on Pattern Recognition, 2000. - : IEEE. - 0769507506 ; , s. 870-876
  • Konferensbidrag (refereegranskat)abstract
    • This contest involved the running and evaluation of computer vision and pattern recognition techniques on different data sets with known groundwidth. The contest included three areas; binary shape recognition, symbol recognition and image flow estimation. A package was made available for each area. Each package contained either real images with manual groundtruth or programs to generate data sets of ideal as well as noisy images with known groundtruth. They also contained programs to evaluate the results of an algorithm according to the given groundtruth. These evaluation criteria included the generation of confusion matrices, computation of the misdetection and false alarm rates and other performance measures suitable for the problems. The paper summarizes the data generation for each area and experimental results for a total of six participating algorithms
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  • Resultat 1-10 av 29
  • [1]23Nästa
 
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