The Marey Graph Animation Tool Demo

Enabling the user of a graph drawing system to preserve the mental map between two different layouts of a graph is a major problem. In this paper we present Marey, a system that can smoothly transform one drawing of a graph into another without any restrictions to the class of graphs or type of layout algorithm.

Phenotypic correlates of post-fledging dispersal in a population of greater flamingos: the importance of body condition

International audience1. Factors influencing post-fledging movements before the first breeding attempt were studied in individually marked greater flamingos ( Phoenicopterus ruber roseus ) born in the Camargue, southern France, between their natal area and their principal wintering grounds (Spain, Sardinia, Tunisia and France) from 1995 to 1999. 2. We tested whether post-fledging dispersal was affected by sex, age, year, body condition, body mass and tarsus length using a multistate capture–recapture modelling approach. We focused particularly on the hypothesis that increased movement probabilities were associated with good and poor body condition. Because long-distance dispersal is energetically expensive and may involve a high risk of mortality, the acquisition of a robust physical condition prior to dispersal probably plays a critical role in determining the extent to which animals disperse. At the other extreme, birds in poor condition either leave their natal area or starve, which should result in relatively high dispersal rates. 3. Movement probabilities were not sex-dependent, but were age-dependent with high movement probabilities during the first year of life (above 0·6) and low probabilities after the first year (0·055). Movement probabilities also differed between years and localities. 4. Movement probability from the natal area was related to the body condition (and body mass) of the fledglings, with a high movement probability (0·873) when juveniles were in good body condition, and a relatively lower probability (from 0·629 to 0·724) when juveniles were in poorer condition. The proportion of variability in dispersal explained by body condition and body mass were 90·9% and 63·5%, respectively. 5. Results support the hypothesis that condition affects dispersal patterns from the natal area. They also suggest that body condition and local environmental conditions during the early growth play a role in dispersal

Phase transitions in ferroelectric nonachlorodiantimonate [(CH 3)3NH]3Sb2Cl9 studied by calorimetric and dielectric methods

Phase transitions occurring in a ferroelectric crystal tris(trimethylammonium)nonachlorodiantimonate (III) (TMACA) were studied by calorimetric, dielectric and pyroelectric methods. Anomalies of dielectric and thermal properties were found around 200 K and at ca. 364 K. The anomalies in the low-temperature region exhibit a pronounced relaxational character. A detailed study of the behaviour of TMACA around 364 K clearly indicates that in fact TMACA undergoes two closely lying phase transitions, one of them being probably of the first order and the other of the second order. The temperature of the second order transition was determined to amount to (364.0 ± 0.3) K irrespective of the method employed, whereas the first order transition temperatures are detected by the dielectric measurements ca. 1 K below those found from the calorimetric measurements. An unusual sequence of the phase transitions was observed in DSC measurements : both on cooling and on heating the samples through the transition region, the second order phase transition precedes the first order one. The onset to ferroelectricity was found to be associated with the first order phase transition.Nous avons étudié des transitions de phase dans les cristaux de tris (triméthylammonium) nonachlorodiantimonate (III) (TMACA) par microcalorimétrie différentielle (DSC), ainsi que par des mesures des propriétés diélectriques et pyroélectriques. A 364 K, TMACA présente une transition depuis une phase basse température ferroélectrique vers une phase haute température paraélectrique. Une anomalie a été aussi observée à environ 200 K, associée probablement à une relaxation. Les résultats obtenus montrent que la transition à 364 K présente en fait deux transitions très rapprochées, l'une étant probablement du premier ordre et l'autre du second ordre. La transition du deuxième ordre est observée à la même température (364.0 ± 0,3) K quelle que soit la méthode utilisée, alors que celle du premier ordre est décelée par mesure de la constante diélectrique un degré plus bas que par calorimétrie. Celle-ci montre de plus un phénomène inhabituel, qu'on opère en programmation de température croissante ou décroissante : dans les deux cas, la transition du second ordre précède la transition du premier ordre. L'étude de la réponse pyroélectrique du cristal montre que le passage à l'état polaire est gouverné par la transition du premier ordre

Graph Drawing in Motion II

Enabling the user of a graph drawing system to preserve the mental map between two different layouts of a graph is a major problem. Whenever a layout in a graph drawing system is modified, the mental map of the user must be preserved. One way in which the user can be helped in understanding a change of layout is through animation of the change. In this paper, we present clustering-based strategies for identifying groups of nodes sharing a common, simple motion from initial layout to final layout. Transformation of these groups is then handled separately in order to generate a smooth animation

Drawing Hypergraphs in the Subset Standard (Short Demo Paper)

We report an experience on a practical system for drawing hypergraphs in the subset standard. The PATATE system is based on the application of a classical force directed method to a dynamic graph, which is deduced, at a given iteration time, from the hypergraph structure and particular vertex locations. Different strategies to define the dynamic underlying graph are presented. We illustrate in particular the method when the graph is obtained by computing an Euclidean Steiner tree