187,513 research outputs found
Inexpensive, removable coating for plaster tooling
Procedure for thinning and spaying a vinyl material provides strippable film for plaster surfaces. Coating is low-cost, effective seal against moisture and other sources of damage. Coating consists of a mixture of hot-spray vinyl material and 30 to 50 percent by volume of methyl ethyl ketone
Estimation of Lyapunov spectra from space-time data
A method to estimate Lyapunov spectra from spatio-temporal data is presented,
which is well-suited to be applied to experimental situations. It allows to
characterize the high-dimensional chaotic states, with possibly a large number
of positive Lyapunov exponents, observed in spatio-temporal chaos. The method
is applied to data from a coupled map lattice
Modelling heat transfer through a novel design of rotary kiln
A novel form of rotary kiln has been developed which confers advantages over conventional designs. Details are given of the main features of the kiln, along with an approach used to study its heat transfer characteristics when hot processing waste products into a lightweight synthetic aggregate for recycling in building materials. Computer aided finite element modelling was used to predict temperature profiles and heat fluxes involving non-linear properties of the exterior insulation materials and internal radiation effects. Observations are given comparing predicted temperatures for two different cross sectional shapes and with those measured in practice on a prototype novel kiln. Observations are also given on the methods of approach to the modelling
Long- and short-time asymptotics of the first-passage time of the Ornstein-Uhlenbeck and other mean-reverting processes
The first-passage problem of the Ornstein-Uhlenbeck process to a boundary is
a long-standing problem with no known closed-form solution except in specific
cases. Taking this as a starting-point, and extending to a general
mean-reverting process, we investigate the long- and short-time asymptotics
using a combination of Hopf-Cole and Laplace transform techniques. As a result
we are able to give a single formula that is correct in both limits, as well as
being exact in certain special cases. We demonstrate the results using a
variety of other models
Effective Field Theory in Nuclear Physics
The Electromagnetic and Hadronic Physics sub-community of nuclear physics
held a town hall meeting at Jefferson Lab during November 30 to December 4 of
2000. This is is our combined contribution to the white paper that will result
from this meeting.Comment: 13 pages, 2 figures, late
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