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Université de Neuchâtel

L'explication et les mondes possibles

Lecomte, Alain

In: Travaux du Centre de Recherches Sémiologiques, 1981, vol. 39, p. 35-58

Université de Neuchâtel

"Ils nous expliquèrent que..."

Ebel, Marianne

In: Travaux du Centre de Recherches Sémiologiques, 1981, vol. 39, p. 1-33

Université de Fribourg

A generalized model via random walks for information filtering

Ren, Zhuo-Ming ; Kong, Yixiu ; Shang, Ming-Sheng ; Zhang, Yi-Cheng

In: Physics Letters A, 2016, vol. 380, no. 34, p. 2608–2614

There could exist a simple general mechanism lurking beneath collaborative filtering and interdisciplinary physics approaches which have been successfully applied to online E-commerce platforms. Motivated by this idea, we propose a generalized model employing the dynamics of the random walk in the bipartite networks. Taking into account the degree information, the proposed generalized model...

Université de Fribourg

Recovery rate affects the effective epidemic threshold with synchronous updating

Shu, Panpan ; Wang, Wei ; Tang, Ming ; Zhao, Pengcheng ; Zhang, Yi-Cheng

In: Chaos: An Interdisciplinary Journal of Nonlinear Science, 2016, vol. 26, no. 6, p. 63108

Accurate identification of effective epidemic threshold is essential for understanding epidemic dynamics on complex networks. In this paper, we systematically study how the recovery rate affects the susceptible-infected-removed spreading dynamics on complex networks, where synchronous and asynchronous updating processes are taken into account. We derive the theoretical effective epidemic...

Université de Fribourg

The mathematics of non-linear metrics for nested networks

Wu, Rui-Jie ; Shi, Gui-Yuan ; Zhang, Yi-Cheng ; Mariani, Manuel Sebastian

In: Physica A: Statistical Mechanics and its Applications, 2016, vol. 460, p. 254–269

Numerical analysis of data from international trade and ecological networks has shown that the non-linear fitness–complexity metric is the best candidate to rank nodes by importance in bipartite networks that exhibit a nested structure. Despite its relevance for real networks, the mathematical properties of the metric and its variants remain largely unexplored. Here, we perform an analytic...

Université de Fribourg

Photoinduced gap closure in an excitonic insulator

Golež, Denis ; Werner, Philipp ; Eckstein, Martin

In: Physical Review B, 2016, vol. 94, no. 3, p. 35121

We study the dynamical phase transition out of an excitonic insulator phase after photoexcitation using a time-dependent extension of the self-consistent GW method. We connect the evolution of the photoemission spectra to the dynamics of the excitonic order parameter and identify two dynamical phase transition points marked by a slowdown in the relaxation: one critical point is connected with...

Université de Fribourg

Suppression of spin-exchange relaxation in tilted magnetic fields within the geophysical range

Scholtes, Theo ; Pustelny, Szymon ; Fritzsche, Stephan ; Schultze, Volkmar ; Stolz, Ronny ; Meyer, Hans-Georg

In: Physical Review A, 2016, vol. 94, no. 1, p. 13403

We present a detailed experimental and theoretical study on the relaxation of spin coherence due to the spin-exchange mechanism arising in the electronic ground states of alkali-metal vapor atoms. As opposed to the well-explored formation of a stretched state in a longitudinal geometry (magnetic field parallel to the laser propagation direction) we employ adapted hyperfine-selective optical...

Université de Fribourg

Phase separation on the sphere: Patchy particles and self-assembly

Bott, Matthias Christian ; Brader, Joseph M.

In: Physical Review E, 2016, vol. 94, no. 1, p. 12603

Motivated by observations of heterogeneous domain structure on the surface of cells, we consider a minimal model to describe the dynamics of phase separation on the surface of a spherical particle. Finite-size effects on the curved particle surface lead to the formation of long-lived, metastable states for which the density is distributed in patches over the particle surface. We study the...

Université de Fribourg

The influence of the gait-related arm swing on elevation gain measured by sport watches

Ammann, Rahel ; Taube, Wolfgang ; Neuhaus, Matthias ; Wyss, Thomas

In: Journal of Human Kinetics, 2016, vol. 50, no. 2, p. 53–60

The elevation gain is an important contributor to the total workload in endurance sports. The purpose of this study was to evaluate the influence of the arm swing on elevation gain in three sport watches (Garmin® Forerunner 910XT, Polar® RS800CX and Suunto® Ambit2) on a flat 400 m outdoor track. Altogether, a total of 120 repetitions of 1,200 m were performed at self-selected speeds...

Université de Fribourg

Partly segregated cortico-subcortical pathways support phonologic and semantic verbal fluency: A lesion study

Chouiter, Leila ; Holmberg, Josefina ; Manuel, Aurelie L. ; Colombo, Françoise ; Clarke, Stephanie ; Annoni, Jean-Marie ; Spierer, Lucas

In: Neuroscience, 2016, vol. 329, p. 275–283

Verbal fluency refers to the ability to generate as many words as possible in a limited time interval, without repetition and according to either a phonologic (each word begins with a given letter) or a semantic rule (each word belongs to a given semantic category). While current literature suggests the involvement of left fronto-temporal structures in fluency tasks, whether the same or...