9,011 research outputs found
Visualization of Publication Impact
Measuring scholarly impact has been a topic of much interest in recent years.
While many use the citation count as a primary indicator of a publications
impact, the quality and impact of those citations will vary. Additionally, it
is often difficult to see where a paper sits among other papers in the same
research area. Questions we wished to answer through this visualization were:
is a publication cited less than publications in the field?; is a publication
cited by high or low impact publications?; and can we visually compare the
impact of publications across a result set? In this work we address the above
questions through a new visualization of publication impact. Our technique has
been applied to the visualization of citation information in INSPIREHEP
(http://www.inspirehep.net), the largest high energy physics publication
repository
Morphology transition at depinning in a solvable model of interface growth in a random medium
We propose a simple, exactly solvable, model of interface growth in a random
medium that is a variant of the zero-temperature random-field Ising model on
the Cayley tree. This model is shown to have a phase diagram (critical
depinning field versus disorder strength) qualitatively similar to that
obtained numerically on the cubic lattice. We then introduce a specifically
tailored random graph that allows an exact asymptotic analysis of the height
and width of the interface. We characterize the change of morphology of the
interface as a function of the disorder strength, a change that is found to
take place at a multicritical point along the depinning-transition line.Comment: 7 pages, 6 figure
Top-down/bottom-up approach for developing sustainable development indicators for mining: Application to the Arlit uranium mines (Niger)
Minerals extraction is related to complex sustainable-development issues that are subject to international and local controversies. Debates and decisions need to be based on objective and comparative elements. Defining strong indicators for assessing impacts and performances of mining sites thus appears necessary to inform and support the decision-making process for stakeholders. In recent years, many indicator sets have been developed on an international level based on top-down approaches. But they commonly lack legitimacy for stakeholders and adequacy to specific site issues. They thus need to be complemented by the consultation of local actors concerned by such mining activity, in order to define indicators that are closer to the needs and contexts of the specific sites. This is the goal of the work reported in this paper, undertaken at the Arlit uranium mines in Niger. Our objective was to define indicators that are understood and accepted by all actors, as a basis for robust and transparent assessment of the impacts and performances of mining sites across the four sustainable development dimensions, and at local, regional and national scales.Deliberation; Evaluation; Indicators; Mining; Multi-criteria; Niger; Stakeholders; Stewardship; Sustainable development; Top-down/bottom-up; Uranium
Hysteresis and avalanches in the T=0 random-field Ising model with 2-spin-flip dynamics
We study the non-equilibrium behavior of the three-dimensional Gaussian
random-field Ising model at T=0 in the presence of a uniform external field
using a 2-spin-flip dynamics. The deterministic, history-dependent evolution of
the system is compared with the one obtained with the standard 1-spin-flip
dynamics used in previous studies of the model. The change in the dynamics
yields a significant suppression of coercivity, but the distribution of
avalanches (in number and size) stays remarkably similar, except for the
largest ones that are responsible for the jump in the saturation magnetization
curve at low disorder in the thermodynamic limit. By performing a finite-size
scaling study, we find strong evidence that the change in the dynamics does not
modify the universality class of the disorder-induced phase transition.Comment: 9 pages, 10 figure
On Global Warming (Softening Global Constraints)
We describe soft versions of the global cardinality constraint and the
regular constraint, with efficient filtering algorithms maintaining domain
consistency. For both constraints, the softening is achieved by augmenting the
underlying graph. The softened constraints can be used to extend the
meta-constraint framework for over-constrained problems proposed by Petit,
Regin and Bessiere.Comment: 15 pages, 7 figures. Accepted at the 6th International Workshop on
Preferences and Soft Constraint
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