SUPERCONDUCTIVIDAD CONDUCTIVIDAD ELECTRICA SUPERCONDUCTORES DE TIPO II Superconductivity Type-II superconductors Bulk density Conductivity Critical behavior of Young's modulus for two-dimensional randomly holed metallized Mylar Current-voltage characteristics in collective pinning DENSIDAD VOLUMICA APARENTE Debye temperature Dimensional crossovers in collective flux pinning ELASTICIDAD Elastic properties Electric conductivity Electric potential Electrical resistivity FLUJO MAGNETICO Kapitza resistanceIISuperconductivityIIKhalatnikov theory Linear temperature dependence of the resistivity in the new superconductors MODULO DE YOUNG Magnetic flux POTENCIAL ELECTRICO RESISTENCIA DE KAPITZAIISUPERCONDUCTIVIDADIITEORIA DE KHALATNIKOV SUPERCONDUCTIVITY Specific heat of La1.8Sr0.2CuO4: Anomaly at the superconducting transition Surface superoonductivity and Kapitza resistence Surface-Temperature Determination in the Kapitza Problem TEMPERATURA DE DEBYE Young modulus