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Petersen A.M.,IMT Lucca Institute for Advanced Studies | Succi S.,Istituto Applicazioni Calcolo | Succi S.,Freiburg Institute for Advanced Studies
Journal of Informetrics | Year: 2013

We present a simple generalization of Hirsch's h-index, Z≡h2+C/5, where C is the total number of citations. Z is aimed at correcting the potentially excessive penalty made by h on a scientist's highly cited papers, because for the majority of scientists analyzed, we find the excess citation fraction (C-h2)/C to be distributed closely around the value 0.75, meaning that 75% of the author's impact is neglected. Additionally, Z is less sensitive to local changes in a scientist's citation profile, namely perturbations which increase h while only marginally affecting C. Using real career data for 476 physicists careers and 488 biologist careers, we analyze both the distribution of Z and the rank stability of Z with respect to the Hirsch index h and the Egghe index g. We analyze careers distributed across a wide range of total impact, including top-cited physicists and biologists for benchmark comparison. In practice, the Z-index requires the same information needed to calculate h and could be effortlessly incorporated within career profile databases, such as Google Scholar and ResearcherID. Because Z incorporates information from the entire publication profile while being more robust than h and g to local perturbations, we argue that Z is better suited for ranking comparisons in academic decision-making scenarios comprising a large number of scientists. © 2013 Elsevier Ltd.

Romatschke P.,Frankfurt Institute for Advanced Studies | Mendoza M.,ETH Zurich | Succi S.,Istituto per le Applicazioni Del Calcolo | Succi S.,Freiburg Institute for Advanced Studies
Physical Review C - Nuclear Physics | Year: 2011

Starting from the Maxwell-Jüttner equilibrium distribution, we develop a relativistic lattice Boltzmann (LB) algorithm capable of handling ultrarelativistic systems with flat, but expanding, spacetimes. The algorithm is validated through simulations of a quark-gluon plasma, yielding excellent agreement with hydrodynamic simulations. The present scheme opens the possibility of transferring the recognized computational advantages of lattice kinetic theory to the context of both weakly and ultrarelativistic systems. © 2011 American Physical Society.

Mendoza M.,ETH Zurich | Herrmann H.J.,ETH Zurich | Succi S.,CNR Institute of Neuroscience | Succi S.,Freiburg Institute for Advanced Studies
Physical Review Letters | Year: 2011

We provide numerical evidence that electronic preturbulent phenomena in graphene could be observed, under current experimental conditions, through current fluctuations, echoing the detachment of vortices past localized micron-sized impurities. Vortex generation, due to micron-sized constriction, is also explored with special focus on the effects of relativistic corrections to the normal Navier-Stokes equations. These corrections are found to cause a delay in the stability breakout of the fluid as well as a small shift in the vortex shedding frequency. © 2011 American Physical Society.

Mendoza M.,ETH Zurich | Boghosian B.M.,Tufts University | Herrmann H.J.,ETH Zurich | Succi S.,Istituto per le Applicazioni Del Calcolo | Succi S.,Freiburg Institute for Advanced Studies
Physical Review Letters | Year: 2010

A lattice Boltzmann formulation for relativistic fluids is presented and numerically validated through quantitative comparison with recent hydrodynamic simulations of relativistic fluids. In order to illustrate its capability to handle complex geometries, the scheme is also applied to the case of a three-dimensional relativistic shock wave, generated by a supernova explosion, impacting on a massive interstellar cloud. This formulation opens up the possibility of exporting the proven advantages of lattice Boltzmann methods, namely, computational efficiency and easy handling of complex geometries, to the context of (mildly) relativistic fluid dynamics at large, from quark-gluon plasmas up to supernovae with relativistic outflows. © 2010 The American Physical Society.

Van Agtmael T.,University of Glasgow | Bruckner-Tuderman L.,Albert Ludwigs University of Freiburg | Bruckner-Tuderman L.,Freiburg Institute for Advanced Studies
Cell and Tissue Research | Year: 2010

In 1990, the role of basement membranes in human disease was established by the identification of COL4A5 mutations in Alport's syndrome. Since then, the number of diseases caused by mutations in basement membrane components has steadily increased as has our understanding of the roles of basement membranes in organ development and function. However, many questions remain as to the molecular and cellular consequences of these mutations and the way in which they lead to the observed disease phenotypes. Despite this, exciting progress has recently been made with potential treatment options for some of these so far incurable diseases. © 2009 Springer-Verlag.

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