937 research outputs found
Meteorological interpretation of Nimbus High Resolution Infrared /HRIR/ data
Nimbus satellite high resolution infrared photographic data analysi
Aeroelastic Testing of ASLV Models for Predicting Transonic Buffet Response : Ground Studies
A 1:20 Scale Aeroelastic model of ASLV is designed for studying its transonic buffet response.The model simulates full-scale parameters at Mach one condition and is designed for testing in the NAL 1.2m Trisonic Wind Tunnel. This report describes the static and dynamic ground tests conducted on ASLV aeroelastic models to determine the degree of simulation of required characteristics in the model and to evaluate parameters useful in Wind Tunnel test data analysi
Dualities in persistent (co)homology
We consider sequences of absolute and relative homology and cohomology groups
that arise naturally for a filtered cell complex. We establish algebraic
relationships between their persistence modules, and show that they contain
equivalent information. We explain how one can use the existing algorithm for
persistent homology to process any of the four modules, and relate it to a
recently introduced persistent cohomology algorithm. We present experimental
evidence for the practical efficiency of the latter algorithm.Comment: 16 pages, 3 figures, submitted to the Inverse Problems special issue
on Topological Data Analysi
Recent social and economic trends for the U.S.
"September 1981"Office of social and economic data analysi
Canonical stratifications along bisheaves
A theory of bisheaves has been recently introduced to measure the homological
stability of fibers of maps to manifolds. A bisheaf over a topological space is
a triple consisting of a sheaf, a cosheaf, and compatible maps from the stalks
of the sheaf to the stalks of the cosheaf. In this note we describe how, given
a bisheaf constructible (i.e., locally constant) with respect to a
triangulation of its underlying space, one can explicitly determine the
coarsest stratification of that space for which the bisheaf remains
constructible.Comment: 10 pages; this is the Final Version which appeared in the Proceedings
of the 2018 Abel Symposium on Topological Data Analysi
Unbound states in C populated by -decay of the 16.11 MeV state
The reaction has been used to populate the state at an excitation energy of 16.11 MeV in C. -decay
to unbound states in C are identified from analysis of the decay of the
populated daughter states. Due to a new technique, -decay to the 10.8
MeV 1 state is observed for the first time, and transitions to the 9.64 MeV
(3) and 12.71 MeV (1) are confirmed. Unresolved transitions to natural
parity strength at 10 MeV and 11.5-13 MeV are also observed. For all
transitions partial widths are deducedComment: Corrected small typographical errors and added more details on data
analysi
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