This paper describes a new spatial operator algebra for the dynamics of general{topology rigid multibody systems. Spatial operators allow a concise and systematic formulation of the dynamical equations of motion of multibody systems and the development of e cient computational algorithms. Equations of motion are developed for progressively more complex systems: serial chains, topological trees,...

Geophysical mass flows--debris flows, avalanches, landslides--can contain O(10(6)-10(10)) m(3) or more of material, often a mixture of soil and rocks with a significant quantity of interstitial fluid. These flows can be tens of meters in depth and hundreds of meters in length. The range of scales and the rheology of this mixture presents significant modelling and computational challenges. This ...

We present a classical approach to a mixture of compressible fluids when each constituent has its own temperature. The introduction of an average temperature together with the entropy principle dictates the classical Fick law for diffusion and also novel constitutive equations associated with the difference of temperatures between the components. The constitutive equations fit with results rece...

Near-perfect atttomatic accent assignment is attainable,for citation-s~le speech, but better computational models art, needed to predict accent in extended, spontaneous discourses. This paper presents an empirically motivated theory of the discourse ]bcttsing nature of accent in spontaneous speech. Hypotheses based on this theory lead to a new approach to accent prediction, in which patterns o ...

Combining the 1-best output of multiple parsers via parse selection or parse hybridization improves f-score over the best individual parser (Henderson and Brill, 1999; Sagae and Lavie, 2006). We propose three ways to improve upon existing methods for parser combination. First, we propose a method of parse hybridization that recombines context-free productions instead of constituents, thereby pr...

In this talk I will motivate the the need for the constituent quark structure. I will also summarize results from the NJL model for the composites of the constituent quark and present an alternative QCD sum rule approach.

We present localized ``particlelike'' states composed of a pair neutral fermions interacting with scalar Higgs field and the metric spacetime, extending Einstein-Dirac formalism introduced by Finster et al. [Particlelike solutions equations, Phys. Rev. D 59, 104020 (1999)]. demonstrate that, when coupling between is strong, there class in which total (ADM) mass no longer increases proportionall...

An elementary formalism is described to generate series of massless radial excitations within a relativistic BS (confinement) model, thus excluding orbital excitations. Coupling the photon to the constituent scalar, a finite self-mass integral results in the lowest order of a. It represents an infinite system of self-consistent equations for an infinite number of leptonic masses. The system can...