787 research outputs found
Enumeration of generalized polyominoes
As a generalization of polyominoes we consider edge-to-edge connected
nonoverlapping unions of regular -gons. For we determine formulas
for the number of generalized polyominoes consisting of regular
-gons. Additionally we give a table of the numbers for small
and obtained by computer enumeration. We finish with some open problems for
-polyominoes.Comment: 10 pages, 6 figures, 3 table
Compatible solute influence on nucleic acids: Many questions but few answers
Compatible solutes are small organic osmolytes including but not limited to sugars, polyols, amino acids, and their derivatives. They are compatible with cell metabolism even at molar concentrations. A variety of organisms synthesize or take up compatible solutes for adaptation to extreme environments. In addition to their protective action on whole cells, compatible solutes display significant effects on biomolecules in vitro. These include stabilization of native protein and nucleic acid structures. They are used as additives in polymerase chain reactions to increase product yield and specificity, but also in other nucleic acid and protein applications
Higher-order hadronic and heavy-lepton contributions to the anomalous magnetic moment
We report about recent results obtained for the muon anomalous magnetic
moment. Three-loop kernel functions have been computed to obtain the
next-to-next-to-leading-order hadronic vacuum polarization contributions. The
numerical result, , is of
the same order of magnitude as the current uncertainty from the hadronic
contributions. For heavy-lepton corrections, analytical results are obtained at
four-loop order and compared with the known results.Comment: Contribution to the proceedings of Loops and Legs in Quantum Field
Theory, 27 April - 2 May 2014, Weimar, German
Hadronic contribution to the muon anomalous magnetic moment to next-to-next-to-leading order
We compute the next-to-next-to-leading order hadronic contribution to the
muon anomalous magnetic moment originating from the photon vacuum polarization.
The corresponding three-loop kernel functions are calculated using asymptotic
expansion techniques which lead to analytic expressions. Our final result,
, has the same order of
magnitude as the current uncertainty of the leading order hadronic contribution
and should thus be included in future analyses.Comment: 9 pages,v2: note on NLO hadronic light-by-light contribution added,
matches published version, Physics Letters B 734 (2014) 144-14
Detecting Invalid Map Merges in Lifelong SLAM
For Lifelong SLAM, one has to deal with temporary localization failures,
e.g., induced by kidnapping. We achieve this by starting a new map and merging
it with the previous map as soon as relocalization succeeds. Since
relocalization methods are fallible, it can happen that such a merge is
invalid, e.g., due to perceptual aliasing. To address this issue, we propose
methods to detect and undo invalid merges. These methods compare incoming scans
with scans that were previously merged into the current map and consider how
well they agree with each other. Evaluation of our methods takes place using a
dataset that consists of multiple flat and office environments, as well as the
public MIT Stata Center dataset. We show that methods based on a change
detection algorithm and on comparison of gridmaps perform well in both
environments and can be run in real-time with a reasonable computational cost.Comment: Accepted at IROS 202
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