A vector Sd-flow is a flow whose flow values are vectors in Sd, where Sd is the set of all unit vectors in Rd+1. Jain [Open Problem Garden, http://www.openproblemgarden.org/op/unit vector flows (2007)] and Thomassen [J. Combin. Theory Ser. B., 108 (2014), pp. 81–91] proved that a graph has a vector S1-flow if it has a nowhere-zero integer 3-flow. Thomassen [J. Combin. Theory Ser. B., 108 (2014)...

It is now clear that AGN heat cooling flows, largely by driving winds. The winds may contain a relativistic component that generates powerful synchrotron radiation, but it is not clear that all winds do so. The spatial and temporal stability of the AGN/cooling flow interaction are discussed. Collimation of the winds probably provides spatial stability. Temporal stability may be possible only fo...

When a Hamiltonian system has a \Kinetic + Potential" structure, the resulting ow is locally a geodesic ow. But there may be singularities of the geodesic structure, so the local structure does not always imply that the ow is globally a geodesic ow. In order for a ow to be a geodesic ow, the underlying manifold must have the structure of a unit tangent bundle. We develop homological conditions ...

A Bandwidth Control Scheme for Connectionless ATM Tra c with Multiple Tra c Classes J org Liebeherr y Ian F. Akyildiz z Debapriya Sarkar ? y Computer Science Department, University of Virginia, Charlottesville, VA 22903. z School of ECE, Georgia Institute of Technology, Atlanta, GA 30332. ? Hughes Network Systems, Hughes Network Systems, Germantown, MD 20876. Abstract A bandwidth control mecha...

Abstract. In this paper, a Cascaded Lattice Boltzmann Method with second order slip boundary conditions is developed to study gas flows in a microchannel in the slip and transition flow regimes with a wide range of Knudsen numbers. For the first time the effect of wall confinement is considered on the effective mean free path of the gas molecules using a function with nonconstant Bosanquet para...

A bandwidth control mechanism is proposed for ATM networks that can control the usage of bandwidth in the presence of both connection oriented and connection less tra c as well as multiple classes of connectionless tra c The bandwidth control mechanism operates at three levels At the topmost level bandwidth is dy namically regulated between connection oriented and connectionless tra c based on ...