The discrete particle method (DPM) is used to model granular flows down an inclined chute with varying basal roughness, thickness and inclination. We observe three major regimes: arresting flows, steady uniform flows and accelerating flows. For flows over a smooth base, other (quasi-steady) regimes are observed: for small inclinations the flow can be highly energetic and strongly layered in dep...

In this paper we study algorithms for pricing of financial contracts using a lattice process of interest rates. If the cash-flows generated by the contract depend on the history of the interest rates (path dependent contracts), then the pricing algorithms are typically of exponential complexity. We demonstrate that for some models, there exist polynomial algorithms for path dependent contracts....

BACKGROUND Severe acute respiratory syndrome (SARS) originated in China in 2002, and it spread to 26 provinces in mainland China and 32 countries across five continents in a matter of months. This outbreak resulted in 774 deaths. However, the spatial features and potential determinants of SARS input-output flows remain unclear. METHODS We used an adjusted spatial interaction model to examine ...

We study generation of magnetic fields involving large spatial scales by time-and space-periodic small-scale parity-invariant flows. The anisotropic magnetic eddy diffusivity tensor is calculated by the standard procedure involving expansion of magnetic modes and their growth rates in power series in the scale ratio. Our simulations, conducted for flows with random harmonic composition and expo...

We discuss the application of complex variable methods to Hele-Shaw flows and twodimensional Stokes flows, both with free boundaries. We outline the theory for the former, in the case where surface tension effects at the moving boundary are ignored. We review the application of complex variable methods to Stokes flows both with and without surface tension, and we explore the parallels between t...

An explosive growth in business applications using the Internet have resulted in a strong demand for some notion of reliability or quality of service. During periods of congestion or failure, the quality of service of all flows is degraded. As a result, a strong need for service differentiation in the flows to provide service guarantees. Today the internet carries different types of traffic wit...

This paper examines the effects of using parallel TCP flows to improve end-to-end network performance for distributed data intensive applications. A series of transmission experiments were conducted over a widearea network to assess how parallel flows improve throughput, and to understand the number of flows necessary to improve throughput while avoiding congestion. An empirical throughput expr...

let $r$ be a commutative ring with zero-divisor set $z(r)$. the total graph of $r$, denoted by$t(gamma(r))$, is the simple (undirected) graph with vertex set  $r$ where two distinct vertices areadjacent if their sum lies in $z(r)$.this work considers minimum zero-sum $k$-flows for $t(gamma(r))$.both for $vert rvert$ even and the case when $vert rvert$ is odd and $z(g)$ is an ideal of $r$it is s...

This paper begins by examining the pattern of capital flows first to low-income countries, and then to emerging economies. In both cases, we see a dramatic collapse in the last several years. The evolving determinants of these trends in FDI flows (the principal category of private flows to low-income countries) and other capital flows are analysed. The behaviour of flows to emerging economies h...

This paper is about analyzing internet traffic flows for early elephant flow detection. These elephant flows provoke problems in the quality of service of internet traffic. When we can detect these elephant flows in an earlier stage we can take actions against these flows to keep up the quality of service. With this in mind we create a method to quickly identify elephant flows in internet traff...