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  \underline{SCALING OF CURRENT-VOLTAGE CHARACTERISTICS }\\ 
  \underline{IN SUPERCONDUCTING Bi-2212 SILVER-SEATHED TAPE
    WIRES}\\
 \ \\
 \underline{K. Noguchi}, M. Kiuchi, M. 
  Tagomori, T. Matsushita and T. Hasegawa$^{\ast}$\\ 
  Department of Computer Science and Electronics, Kyushu
  Institute of Technology,\\ 680--4 Kawazu, Iizuka 820,
  Japan\\ $^{\ast}$Showa Electric Wire \& Cable Co. Ltd., 
  Kawasaki 210, Japan\\ 
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It was reported that the current-voltage characteristics of
silver-sheathed Bi-2223 tape wires under a magnetic field
parallel to the $c$-axis at various temperatures meet on two
master curves by normalizing as predicted by the vortex
glass-liquid transition theory. According to the report, it
was shown that the dynamic critical index, $z$, increases
and the static one, $\nu$, decreases with increasing
magnetic field. 
However, such variations are not consistent with the
hypothesis of phase transition. In addition the observed $z$ 
values are too small for the two-dimensional flux line
systems.
 In this study, the scaling of current-voltage
characteristics is investigated for more two-dimensional
 Bi-2212 tape wires under the magnetic field parallel to the $c$-axis.
The results are compared with the theoretical analysis based 
on the flux creep-flow mechanism in which the distribution
of flux pinning strength is taken into account.


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