Rule-Based Application Development using Webdamlog

We present the WebdamLog system for managing distributed data on the Web in a peer-to-peer manner. We demonstrate the main features of the system through an application called Wepic for sharing pictures between attendees of the sigmod conference. Using Wepic, the attendees will be able to share, download, rate and annotate pictures in a highly decentralized manner. We show how WebdamLog handles heterogeneity of the devices and services used to share data in such a Web setting. We exhibit the simple rules that define the Wepic application and show how to easily modify the Wepic application.Comment: SIGMOD - Special Interest Group on Management Of Data (2013

Structure and rheological properties of model microemulsion networks filled with nanoparticles

Model microemulsion networks of oil droplets stabilized by non ionic surfactant and telechelic polymer C18-PEO(10k)-C18 have been studied for two droplet-to-polymer size ratios. The rheological properties of the networks have been measured as a function of network connectivity and can be described in terms of simple percolation laws. The network structure has been characterised by Small Angle Neutron Scattering. A Reverse Monte Carlo approach is used to demonstrate the interplay of attraction and repulsion induced by the copolymer. These model networks are then used as matrix for the incorporation of silica nanoparticles (R=10nm), individual dispersion being checked by scattering. A strong impact on the rheological properties is found for silica volume fractions up to 9%

Influence of the glass transition on the liquid-gas spinodal decomposition

We use large-scale molecular dynamics simulations to study the kinetics of the liquid-gas phase separation if the temperature is lowered across the glass transition of the dense phase. We observe a gradual change from phase separated systems at high temperatures to nonequilibrium, gel-like structures that evolve very slowly at low temperatures. The microscopic mechanisms responsible for the coarsening strongly depend on temperature, and change from diffusive motion at high temperature to a strongly intermittent, heterogeneous and thermally activated dynamics at low temperature, leading to logarithmically slow growth of the typical domain size.Comment: 4 pages, 5 figure

Les procédés d’association du public aux décisions prises par les administrations locales

Le code des relations entre le public et l’administration n’a pas été conçu comme spécialement applicable aux administrations locales et, encore moins, comme devant permettre un développement de l’association du public. Il en ressort une lecture troublée de la matière, le cadre nouveau offert par le code portant en lui un risque d’amoindrissement de cette association au niveau local

Les procédés d’association du public aux décisions prises par les administrations locales

Le code des relations entre le public et l’administration n’a pas été conçu comme spécialement applicable aux administrations locales et, encore moins, comme devant permettre un développement de l’association du public. Il en ressort une lecture troublée de la matière, le cadre nouveau offert par le code portant en lui un risque d’amoindrissement de cette association au niveau local

García Belsunce, César A., Pertenencias extrañas. Libros en Buenos Aires 1815, Buenos Aires, Academia Nacional de la Historia, 2013, 264 pp.

El autor parte de la conceptualización de "extrañar" propuesto por el Diccionario de Autoridades de la Academia Española de la Lengua a fin de dar un significado a la idea de "pertenencias extrañas". García Belsunce determina que éstas son, entre otras cosas, libros traídos desde Montevideo y vendidos en Buenos Aires por orden del gobierno porteño. Tal es así que, desde mediados de 1814, se venden o se acopian en la Biblioteca Pública

Cell division and death inhibit glassy behaviour of confluent tissues

We investigate the effects of cell division and apopotosis on collective dynamics in two-dimensional epithelial tissues. Our model includes three key ingredients observed across many epithelia, namely cell-cell adhesion, cell death and a cell division process that depends on the surrounding environment. We show a rich non-equilibrium phase diagram depending on the ratio of cell death to cell division and on the adhesion strength. For large apopotosis rates, cells die out and the tissue disintegrates. As the death rate decreases, however, we show, consecutively, the existence of a gas-like phase, a gel-like phase, and a dense confluent (tissue) phase. Most striking is the observation that the tissue is self-melting through its own internal activity, ruling out the existence of any glassy phase.Comment: 9 pages, 10 figure