Data on macroscopic superconducting anisotropy of MgB 2 are reviewed. The data are described within a weak coupling two-gaps anisotropic s-wave model of super-conductivity. The calculated ratio of the upper critical fields γ H = H c2,ab /H c2,c increases with decreasing temperature in agreement with available data, whereas the calculated ratio of London penetration depths γ λ = λ c /λ ab decrea...

This paper examines several key factors affecting the adoption rate of broadband Internet access in 31 provinces of China by employing the Stochastic Frontier Analysis Model. It was found that disposable income, penetration rate of fixed phones, number of Internet users, and educational attainment were the most important factors in the adoption of broadband. In addition, we present the relative...