The gamma-ray blazar 1611+343 was observed with polarization VLBI mode at 5 GHz in February 1999. The total intensity (I) VLBI image of the source shows a core-jet structure. The jet bends eastward at ∼ 3 mas south of the core. Four components have been detected from results of fitting, with apparent speeds estimated at 6.7 ± 0.7, 2.5 ± 0.3, 4.5 ± 0.5 h −1 c for three jet components (taking H 0 = 100 h km s −1 Mpc −1 , q 0 = 0.5). The polarization (P ) VLBI image of 1611+343 displays the polarized configuration in the jet. The mechanism of the curved jet is discussed.
We report the ohmic contact formation mechanism for a
low-contact resistance PdGe-based system on high-low doped GaAs with
and without undoped cap layer annealed in the temperature range of
380-450°C. The lowest average specific contact resistances of
the Pd/Ge/Ti/Pt ohmic contacts with and without undoped cap layer
after annealing at 400°C were 5.3×10-6 Ω cm2 and
2.4×10-6 Ω cm2, respectively. And the lowest
average specific contact resistances of the Pd/Ge/Ti/Pt/Au ohmic
contacts with and without undoped cap layer after annealing at
380°C were 3.5×10-6 Ω cm2 and 3.4×10-6 Ω cm2, respectively. For the Pd/Ge/Ti/Pt contact without
undoped cap layer, the x-ray diffraction, cross-sectional scanning
electron microscopy and Auger electron spectroscopy were utilized in
this study. The Pd/Ge/Ti/Pt ohmic contact without undoped cap layer
was thermally stable after isothermal annealing at 400°C for
6 h.
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