68 research outputs found
Dynamical convexity of the Euler problem of two fixed centers
We give thorough analysis for the rotation functions of the critical orbits
from which one can understand bifurcations of periodic orbits. Moreover, we
give explicit formulas of the Conley-Zehnder indices of the interior and
exterior collision orbits and show that the universal cover of the regularized
energy hypersurface of the Euler problem is dynamically convex for energies
below the critical Jacobi energy.Comment: Final version, title changed, to appear in Math. Proc. Cambridge
Philos. So
Equivariant wrapped Floer homology and symmetric periodic Reeb orbits
The aim of this article is to apply a Floer theory to study symmetric
periodic Reeb orbits. We define positive equivariant wrapped Floer homology
using a (anti-)symplectic involution on a Liouville domain and investigate its
algebraic properties. By a careful analysis of index iterations, we obtain a
non-trivial lower bound on the minimal number of geometrically distinct
symmetric periodic Reeb orbits on a certain class of real contact manifolds.
This includes non-degenerate real dynamically convex starshaped hypersurfaces
in which are invariant under complex conjugation. As a
result, we give a partial answer to the Seifert conjecture on brake orbits in
the contact setting.Comment: 42 pages, 4 figures, final version, to appear in Ergodic Theory and
Dynamical System
An Analysis of International Energy Conservation Code (IECC)-Compliant Single-Family Residential Energy Use
In 2001, the Texas State Senate passed Senate Bill 5 to reduce ozone levels by encouraging
the reduction of emissions of NOx that were not regulated by the Texas Natural Resource
Conservation Commission, including point sources (power plants), area sources (such as residential
emissions), road mobile sources, and non-road mobile sources. For the building energy section, the
Texas State Legislature adopted the 2000/2001 International Energy Conservation Code, as
modified by the 2001 Supplement, as the state's building energy code. The 2000/2001 IECC is a
comprehensive energy conservation code that establishes a standard for the insulation levels,
glazing and cooling and heating system efficiencies through the use of prescriptive and
performance-based provisions.
Therefore, the purpose of this research is to improve the accuracy of a 2000/2001 IECCcompliant
performance simulation using the DOE-2.1e simulation program to investigate the energy
performance of a typical single-family house. To achieve this purpose, several objectives had to be
accomplished, including: 1) the development of an IECC-compliant simulation model, 2) the
development and testing of specific improvements to the existing code-traceable model, 3) the
calibration and installation of sensors in a case-study house, 4) the validation of the improved simulation model with measured data from the case-study house, and 5) use the validated model to
simulate the energy-conserving features of single-family residences that cannot be simulated with
existing versions of the DOE-2.1e program.
In order to create the code-traceable IECC-compliant simulation model, a base-case house
simulation was created and the results calibrated with measured energy and environmental data
from the case-study house. This was done in order to obtain an improved simulation model that
would more accurately represent the case-study building. The calibrated model was then used to
verify the accuracy of the improved simulation methods against previous models and measured data.
After validation of the new simulation methodologies, the IECC simulation model was used
to simulate different energy-conserving features for a single-family residence that could not be
simulated with the previous version of the DOE-2 input file. Finally, areas for future work were
identified in an effort to continue to improve the model
Genus zero transverse foliations for weakly convex Reeb flows on the tight -sphere
A contact form on the tight -sphere is called weakly convex
if the Conley-Zehnder index of every Reeb orbit is at least . In this
article, we study Reeb flows of weakly convex contact forms on
admitting a prescribed finite set of index- Reeb orbits, which are all
hyperbolic and mutually unlinked. We present conditions so that these index-
orbits are binding orbits of a genus zero transverse foliation whose additional
binding orbits have index . In addition, we show in the real-analytic case
that the topological entropy of the Reeb flow is positive if the branches of
the stable/unstable manifolds of the index- orbits are mutually
non-coincident.Comment: 47 pages; The main results remain unchange
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