Scaling of the conductance distribution near the Anderson transition

The single parameter scaling hypothesis is the foundation of our understanding of the Anderson transition. However, the conductance of a disordered system is a fluctuating quantity which does not obey a one parameter scaling law. It is essential to investigate the scaling of the full conductance distribution to establish the scaling hypothesis. We present a clear cut numerical demonstration that the conductance distribution indeed obeys one parameter scaling near the Anderson transition

Developing a database for automating regulatory affairs in the pharmaceutical industry

The complex procedure of processing the marketing authorization of medicinal product licenses is a challenging task for government health authorities and the pharmaceutical industry across the world. Regulatory requirements have diverged significantly, and each country has its own regulations and procedures for marketing authorizations. The automation of and adequate software support for such procedures are critical factors that can improve the efficiency of regulatory authorities. In this paper we report on the design and implementation of a database whose role is to (a) support the automation of marketing authorization procedures, (b) address the interoperability of such procedures across the world, and (c) be reusable across a family of related applications. Our database is implemented in Oracle8i, and a distributed and component-based application has been built upon it using the J2EE technology

Supporting quality indicators in the UK national health service

Quality indicators for performance management of the UK National Health Service have been introduced for general practitioners (GPs) in order to monitor if they are meeting their performance targets. Such requirements impose significant load to GPs’ everyday operations and any type of software solution that stores relevant information and addresses performance indicators can help GPs to justify their fundholding. In this paper we report on a way of incorporating the semantics of a set of quality indicators in a database schema that can fit any GPs' practice. We concentrate on indicators that posed problems when creating the database and we provide a discussion that justifies our design decisions

Anderson transition in the three dimensional symplectic universality class

We study the Anderson transition in the SU(2) model and the Ando model. We report a new precise estimate of the critical exponent for the symplectic universality class of the Anderson transition. We also report numerical estimation of the $\beta$ function.Comment: 4 pages, 5 figure

Failure of single-parameter scaling of wave functions in Anderson localization

We show how to use properties of the vectors which are iterated in the transfer-matrix approach to Anderson localization, in order to generate the statistical distribution of electronic wavefunction amplitudes at arbitary distances from the origin of $L^{d-1} \times \infty$ disordered systems. For $d=1$ our approach is shown to reproduce exact diagonalization results available in the literature. In $d=2$, where strips of width $L \leq 64$ sites were used, attempted fits of gaussian (log-normal) forms to the wavefunction amplitude distributions result in effective localization lengths growing with distance, contrary to the prediction from single-parameter scaling theory. We also show that the distributions possess a negative skewness $S$, which is invariant under the usual histogram-collapse rescaling, and whose absolute value increases with distance. We find $0.15 \lesssim -S \lesssim 0.30$ for the range of parameters used in our study, .Comment: RevTeX 4, 6 pages, 4 eps figures. Phys. Rev. B (final version, to be published

Symmetry, dimension and the distribution of the conductance at the mobility edge

The probability distribution of the conductance at the mobility edge, $p_c(g)$, in different universality classes and dimensions is investigated numerically for a variety of random systems. It is shown that $p_c(g)$ is universal for systems of given symmetry, dimensionality, and boundary conditions. An analytical form of $p_c(g)$ for small values of $g$ is discussed and agreement with numerical data is observed. For $g > 1$, $\ln p_c(g)$ is proportional to $(g-1)$ rather than $(g-1)^2$.Comment: 4 pages REVTeX, 5 figures and 2 tables include