14,081 research outputs found
Deligne-Beilinson cohomology and abelian link invariants: torsion case
For the abelian Chern-Simons field theory, we consider the quantum functional
integration over the Deligne-Beilinson cohomology classes and present an
explicit path-integral non-perturbative computation of the Chern-Simons link
invariants in , a toy example of 3-manifold with
torsion
Abelian link invariants and homology
We consider the link invariants defined by the quantum Chern-Simons field
theory with compact gauge group U(1) in a closed oriented 3-manifold M. The
relation of the abelian link invariants with the homology group of the
complement of the links is discussed. We prove that, when M is a homology
sphere or when a link -in a generic manifold M- is homologically trivial, the
associated observables coincide with the observables of the sphere S^3. Finally
we show that the U(1) Reshetikhin-Turaev surgery invariant of the manifold M is
not a function of the homology group only, nor a function of the homotopy type
of M alone.Comment: 18 pages, 3 figures; to be published in Journal of Mathematical
Physic
I Wonder What Will William Tell
https://digitalcommons.library.umaine.edu/mmb-vp/1731/thumbnail.jp
Mariner 'c' dsif equivalent ground support equipment, volume 1 final report
Mariner C Deep Space Instrumentation Facility /DSIF/ equivalent ground support equipmen
I got you Steve
Gift of Dr. Mary Jane Esplen.Piano vocal [instrumentation]Now Stevie Brown said to his [first line]I got you Stevie [first line of chorus]C [key]Moderato [tempo]Popular song [form/genre]Couple walking down path ; Mr. Chick and Ed Morton (photographs) [illustration]EH Pfeiffer [graphic artist]Publisher's advertisement on inside front and back cover [note
Complementary Methods for Volcanic Seismic Source Discrimination
ABSTRACT FINAL ID: V53E-2673
TITLE: Complementary Methods for Volcanic Seismic Source Discrimination
SESSION TYPE: Poster
SESSION TITLE: V53E. Surveillance of Volcanic Unrest: New Developments in Multidisciplinary Monitoring Methods IV Posters
AUTHORS (FIRST NAME, LAST NAME): Charlotte A Rowe1, Susanna M R Falsaperla2, Emily Morton3, Horst K Langer2, Boris Behncke2
INSTITUTIONS (ALL): 1. Los Alamos Natl Lab, Los Alamos, NM, United States.
2. Istituto Nazionale di Geofisica e Volcanologia, Catania, Italy.
3. Earth and Environmental Sciences, New Mexico Institute of Mining and Technology, Socorro, NM, United States.
Title of Team:
ABSTRACT BODY: We explore the success rates of detection and classification algorithms as applied to seismic signals from active volcanoes. The subspace detection method has shown some success in identifying repeating (but not identical) signals from seismic swarm sources, as well as pulling out nonvolcanic long period events within subduction zone tremor. We continue the exploration of this technique as applied to both discrete events and variations within volcanic tremor to determine optimal situations for its use.
We will demonstrate both three-dimensional and subband applications both on raw waveforms and derived features such as skewness and kurtosis. The application can be used in both a supervised (select templates and compare) as well as unsupervised (cross-compare all samples and apply clustering to the matrix of comparisons).
We compare the method to that of the KKAnalysis tool, which uses a self-organizing map approach to unsupervised clustering for feature vectors derived from the seismic waveforms. We will present a comparison of this method as applied to waveform features, spectral features and time-varying higher-order statistics as well as signal polarization, to elucidate the tools which show the best promise for problematic discrimination tasks
Tuning gastropod locomotion: Modeling the influence of mucus rheology on the cost of crawling
Common gastropods such as snails crawl on a solid substrate by propagating
muscular waves of shear stress on a viscoelastic mucus. Producing the mucus
accounts for the largest component in the gastropod's energy budget, more than
twenty times the amount of mechanical work used in crawling. Using a simple
mechanical model, we show that the shear-thinning properties of the mucus favor
a decrease in the amount of mucus necessary for crawling, thereby decreasing
the overall energetic cost of locomotion.Comment: Corrected typo
An efficient Fredholm method for calculation of highly excited states of billiards
A numerically efficient Fredholm formulation of the billiard problem is
presented. The standard solution in the framework of the boundary integral
method in terms of a search for roots of a secular determinant is reviewed
first. We next reformulate the singularity condition in terms of a flow in the
space of an auxiliary one-parameter family of eigenproblems and argue that the
eigenvalues and eigenfunctions are analytic functions within a certain domain.
Based on this analytic behavior we present a numerical algorithm to compute a
range of billiard eigenvalues and associated eigenvectors by only two
diagonalizations.Comment: 15 pages, 10 figures; included systematic study of accuracy with 2
new figures, movie to Fig. 4,
http://www.quantumchaos.de/Media/0703030media.av
Host isotope mass effects on the hyperfine interaction of group-V donors in silicon
The effects of host isotope mass on the hyperfine interaction of group-V
donors in silicon are revealed by pulsed electron nuclear double resonance
(ENDOR) spectroscopy of isotopically engineered Si single crystals. Each of the
hyperfine-split P-31, As-75, Sb-121, Sb-123, and Bi-209 ENDOR lines splits
further into multiple components, whose relative intensities accurately match
the statistical likelihood of the nine possible average Si masses in the four
nearest-neighbor sites due to random occupation by the three stable isotopes
Si-28, Si-29, and Si-30. Further investigation with P-31 donors shows that the
resolved ENDOR components shift linearly with the bulk-averaged Si mass.Comment: 5 pages, 4 figures, 1 tabl
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