The spread of invasive species can have far reaching environmental and ecological consequences. Understanding invasion spread patterns and the underlying process driving invasions are key to predicting and managing invasions. We develop a set of statistical methods to characterize local spread properties and demonstrate their application using historical data on the spread of the gypsy moth, Ly...

We can take different sets of images with different environments and with different speeds. We know that temporal segmentation fails in slow movements or where there is very small movement like news readers. We will also test by taking some fast and moderately moving video object where there are sufficient movements between consecutive frames. Here the reference frame is available so we can det...

This paper presents ongoing research on the semantic representation and model-theoretic evaluation of descriptions referring to abstract objects of temporal variation, i.e. events and states (”eventualities”). While common ontologies for temporal entities are geared to the surface of natural language descriptions (in the spirit of [Vendler, 1957], [Davidson, 1967]), I propose to model the relat...

Much of the earlier work on the prehistory of Sudanese Nubia has emphasized discontinuity between early Nubian populations. However, recent investigations suggest the converse - that a remarkable degree of cultural and biological continuity exists among indigenous Nubian groups, perhaps as far back as the Paleolithic. Thus, cultural and biological differences between Nubian populations can be m...

introduction water vapor is an essential climate element. through latent heat exchanges, the water vapor is considered as the principal way of energy transport through the global atmosphere and it is also a dominant greenhouse gas (held and soden, 2000). over the oceans, warmer surface temperatures may lead to increased evaporation and, therefore, greater specific humidity, but an approximately...

Ecological processes, like the rise and fall of populations, leave an imprint of their dynamics as a pattern in space. Mining this spatial record for insight into temporal change underlies many applications, including using spatial snapshots to infer trends in communities, rates of species spread across boundaries, likelihood of chaotic dynamics, and proximity to regime shifts. However, these a...

Despite the apparent advantages of adaptive plasticity, it is not common. We examined the effects of variation and uncertainty on selection for plasticity using an individual-based computer simulation model. In the model, the environment consisted of a linear gradient of 50 demes with dispersal occurring either before or after selection. Individuals consisted of multiple loci whose phenotypic e...