2,247 research outputs found
On the Hamilton-Jacobi equation for second class constrained systems
We discuss a general procedure for arriving at the Hamilton-Jacobi equation
of second-class constrained systems, and illustrate it in terms of a number of
examples by explicitely obtaining the respective Hamilton principal function,
and verifying that it leads to the correct solution to the Euler-Lagrange
equations.Comment: 17 pages, to appear in Ann. Phy
BRST Analysis of QCD_2 as a Perturbed WZW Theory
Integrability of Quantum Chromodynamics in 1+1 dimensions has recently been
suggested by formulating it as a perturbed conformal Wess-Zumino-Witten Theory.
The present paper further elucidates this formulation, by presenting a detailed
BRST analysis.Comment: 14 pages, LaTe
Effect of using the Wisconsin design for reading skill development on the reading achievement of fourth grade pupils
The purpose of this study was to measure the effect of using the Wisconsin Design for Reading Skill Development in the teaching of reading to fourth grade pupils. Since the Wisconsin Design for Reading Skill Development is fairly new, and in the process of being field tested, such research could be a valuable indicator of its worth as a teaching procedure. Three factors were considered in the development of the objective: 1. Would an intensive program in word attack skills increase reading achievement in grade four? 2. Would the results be sufficient to warrant the incorporation of this instruction into the regular program? 3. Would an intensive program benefit all children
Lattice sum rules for the colour fields
We analyse the sum rules describing the action and energy in the colour
fields around glueballs, torelons and static potentials.Comment: 9 pages LATEX, (typos corrected, to appear in Phys Rev D
Asymptotic behavior of age-structured and delayed Lotka-Volterra models
In this work we investigate some asymptotic properties of an age-structured
Lotka-Volterra model, where a specific choice of the functional parameters
allows us to formulate it as a delayed problem, for which we prove the
existence of a unique coexistence equilibrium and characterize the existence of
a periodic solution. We also exhibit a Lyapunov functional that enables us to
reduce the attractive set to either the nontrivial equilibrium or to a periodic
solution. We then prove the asymptotic stability of the nontrivial equilibrium
where, depending on the existence of the periodic trajectory, we make explicit
the basin of attraction of the equilibrium. Finally, we prove that these
results can be extended to the initial PDE problem.Comment: 29 page
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