Climate change is expected to cause geographic shifts in tree species' ranges, but such shifts may not keep pace with climate changes because seed dispersal distances are often limited and competition-induced changes in community composition can be relatively slow. Disturbances may speed changes in community composition, but the interactions among climate change, disturbance and competitive int...

An edge metric is a metric on the interior of a manifold-with-boundary which is singular at the boundary in a manner described by a given fibration of the boundary. The related edge differential operators arise in many settings and have been the subject of much research; see, for example, [Ma]. Our interest in edge metrics arises from the observation that they are a robust class of metrics natu...

This paper discusses research results useful for producing a system which converts a two-dimensional computer sketch of a single homogeneous polyhedral object into a boundary representation solid model. An overview of our approach to such a system and its main algorithms is presented elsewhere. This paper gives more detail of some of the algorithms for categorising sketches according to the typ...

The design process supported by present CAD tools tends to be component oriented rather than dealing with a product as a whole. Furthermore, design evaluation tools often need complete product descriptions to give meaningful results. Presented here is a brief exposition of the architecture and capabilities of an Assembly-oriented Design environment that is currently being developed. It will all...

In this article, the size effect on the dynamic behavior of a simply supported multi-cracked microbeam is studied based on the Modified Couple Stress Theory (MCST).  At first, based on MCST, the equivalent torsional stiffness spring for every open edge crack at its location is calculated; in this regard, the Stress Intensity Factor (SIF) is al...

The quantum spin Hall (QSH) effect is known to be unstable to perturbations violating time-reversal symmetry. We show that creating a narrow ferromagnetic region near the edge of a QSH sample can push one of the counterpropagating edge states to the inner boundary of the ferromagnetic region and leave the other at the outer boundary, without changing their spin polarizations and propagation dir...

A novel boundary detection scheme based on “edge flow” is proposed in this paper. This scheme utilizes a predictive coding model to identify the direction of change in color and texture at each image location at a given scale, and constructs an edge flow vector. By iteratively propagating the edge flow, the boundaries can be detected at image locations which encounter two opposite directions of...