Soon after the introduction of MR imaging, periventricular hyperintensities started to vex the scientific community. While they may be a consequence of distinct disorders such as multiple sclerosis causing focal periventricular lesions or increased intraventricular pressure giving rise to extending hyperintense rims around the lateral ventricles, most periventricular white matter hyperintensiti...

The central conclusion reached by Hanewinkel et al. is that exposure to incidental portrayals of alcohol use in US movies has contributed to the early onset of alcohol use by a group of German adolescents. As is always the case when relying on cross-sectional data, the authors do acknowledge limitations in their ability to assume causal order as well as the likelihood that other confounding fac...

An interconnect joining a source and a sink is divided into xed length uniform width wire segments and some adjacent segments have bu ers in between The problem we considered is to simultaneously size the bu ers and the segments so that the Elmore delay from the source to the sink is minimized Previously no polynomial time al gorithm for the problem has been reported in literature In this paper...

A graph is h-matchable if G-X has a perfect matching for every subset X ~ V(G) with IXI = h, and it is h-extendable if every matching of h edges can be extended to a perfect matching. It is proved that a graph G with even order is 2h-matchable if and only if (1) G is h-extendable; and (2) for any edge set D such that, for each e = xy E D, x,y E V(G) and e ~ E( G), G U D is h-extendable. Also ni...

The structure of magnetic reconnection-driven outflows and their dissipation are explored with 3-D particle-in-cell simulations. Outflow jets resulting from 3-D reconnection with a finite length x-line form fronts as they propagate into the downstream medium. A large pressure increase ahead of this “reconnection jet front” (RJF) due to reflected ions slows the front so that its velocity is well...

Recently opened archives in Central Asia have allowed historians to debunk several myths about the Soviet constitution in that region. Archival research has revealed that indigenous elites were associated with the process of territorial division in the 1920s and 1930s and many of their conflicts were echoed in the central ruling bodies in Moscow. Similarly, field research has undermined the ide...

Tangible computational technologies for education have evolved from research prototypes to the mainstream, led by the wide adoption of commercial kits such as the Lego Mindstorms platform. Despite their success, researchers have pointed out four main issues that have limited their adoption. First, most toolkits were marketed for a particular gender and age group. Second, they had standardized p...

Instrumentation of a reinforced-concrete bridge subject to structural rehabilitation is described. This forty-seven-year-old bridge is located in Dallas County, Missouri and was upgraded using fiber-reinforced-polymer (FRP) sheets and rods. The permanent field instrumentation consists of an array of extrinsic Fabry-Perot interferometric fiber-optic strain sensors and co-located electrical resis...

Three key issues about rhythm and timing in music are drawn to the attention of linguists in a paper by London (2012). In this commentary, I argue that these issues are relevant not only to linguists, but also to those in any field dealing with the temporal dynamics of human communicative behavior. Thus, the distinction between endogenously and exogenously driven mechanisms of perceptual organi...

This paper deals with the constrained reconstruction of 3D geometric models ofobjects from range data. It describes a new technique of global shape improvementbased upon feature positions and geometric constraints. It suggests a general incre-mental framework whereby constraints can be added and integrated in the modelreconstruction process, resulting in an optimal trade-o b...