20,747 research outputs found
New Hybrid Protected Lands Layer for Vermont Conservation Design Analysis (February 2019)
This shapefile (.shp) is a hybrid of the March 2017 Edition of the Vermont Center for Geographic Information\u27s (VCGI) Vermont Protected Lands Database (VPLD), the Vermont Land Trust\u27s February 2019 Protected Lands database, and The Nature Conservancy\u27s Secured Areas (SA 2018+) database. The VLT and SA 2018+ datasets were used as the scaffolding for the hybrid protected lands layer, with some VCGI VPLD polygons retained if they contained unique contributions. These datasets were combined by C.D. Loeb because each input dataset was missing some protected lands polygons in the state of Vermont. Additionally, the VCGI VPLD dataset contained many overlapping polygons, making it unusable for the area calculations of interest to our study on the overlap between formally protected lands and Vermont Conservation Design landscape-level targets (see publication reference).
This hybrid protected lands layer creates a more complete snapshot of Vermont’s protected lands for our study’s purposes than any other known, publicly available dataset as of February 2019, and also corrects for all improperly overlapping polygons. However, we know that this hybrid product still does not capture all of Vermont\u27s protected lands. Specifically, some Upper Valley Land Trust-protected parcels are missing from this hybrid protected lands layer, and there are probably other protected parcels that could not be captured by the input datasets. Thus, our hybrid product will likely underrepresent actual protections.
This layer was created to intersect with Vermont Conservation Design targets for input into the software Tableau. Its purpose was to perform cross tabulations to compare Vermont Conservation Design targets with protected lands in Vermont to-date, and to calculate acreages of protected lands that are also design targets by primary protecting agency. All parcel attributes and delineations in the hybrid output are only as good as the parent datasets. In areas where parcels were digitized differently between parent datasets, “slivers” may have been generated by merging them. Our study objectives originally included an analysis of the GAP Status of protected lands in Vermont (reflected in this layer\u27s metadata); however, some serious errors were detected in parent datasets with regards to GAP Status, so GAP Status was discarded as an analysis object. Please note author-identified GAP Status issues if using this dataset.
Please see the shapefile\u27s metadata for detailed creation steps. The user implies knowledge of the limitations of this dataset. This dataset should not be used to ascertain boundaries or legal acreages for any parcels.
Note: This version of the hybrid protected lands layer does not have county boundaries embedded in it nor waterbodies excluded from it, since it was created to capture all formally protected lands in the state of Vermont to the best of the authors’ abilities. Prior to use in our analysis, this layer was modified to exclude waterbodies and to introduce county boundaries. To obtain the same hybrid protected lands layer with county boundaries embedded in it and waterbodies excluded from it, please contact C. D. Loeb at [email protected]
Dark matter, the CMSSM and lattice QCD
Recent lattice measurements have given accurate estimates of the light and
strange quark condensates in the proton. We use these new results to
significantly improve the dark matter predictions in a set of benchmark models
that represent different scenarios in the constrained minimal supersymmetric
standard model (CMSSM). Because the predicted cross sections are at least an
order of magnitude smaller than previously suggested, our results have
significant consequences for dark matter searches.Comment: 4 pages, 4 figure
Polarization of top quark as a probe of its chromomagnetic and chromoelectric couplings in production at the Large Hadron Collider
We study the sensitivity of the Large Hadron Collider (LHC) to top quark
chromomagnetic (CMDM) and chromoelectric (CEDM) dipole moments and
effective couplings in single-top production in association with a boson,
followed by semileptonic decay of the top. The single-top production mode
helps to isolate the anomalous and couplings, in contrast to
top-pair production and other single-top production modes, where other
new-physics effects can also contribute. We calculate the top polarization and
the effects of these anomalous couplings on it at two centre-of-mass (cm)
energies, 8 TeV and 14 TeV. As a measure of top polarization, we look at
decay-lepton angular distributions in the laboratory frame, without requiring
reconstruction of the rest frame of the top, and study the effect of the
anomalous couplings on these distributions. We construct certain asymmetries to
study the sensitivity of these distributions to top-quark couplings. We
determine individual limits on the dominant couplings, viz., the real part of
the CMDM , the imaginary part of the CEDM
, and the real part of the tensor coupling
, which may be obtained by utilizing these asymmetries at
the LHC. We also obtain simultaneous limits on pairs of these couplings taking
two couplings to be non-zero at a time.Comment: 25 pages, 13 figures, 2 tables. Matches the Published Version. arXiv
admin note: text overlap with arXiv:1211.4075, arXiv:1107.259
2-aminophenols containing electron-withdrawing groups from N-aryl hydroxylamines
Reaction of substituted N-aryl hydroxylamines with methanesulfonyl chloride, p-toluenesulfonyl chloride, or trifluoromethanesulfonic anhydride under basic conditions leads to the rearranged 2-aminophenols (45-94%). The overall reaction sequence can be performed using polymer-supported sulfonyl chloride resin allowing for the effective conversion of N-aryl hydroxylamines to the 2-aminophenols without the need for chromatography
Infinite Families of Gauge-Equivalent -Matrices and Gradations of Quantized Affine Algebras
Associated with the fundamental representation of a quantum algebra such as
or , there exist infinitely many gauge-equivalent
-matrices with different spectral-parameter dependences. It is shown how
these can be obtained by examining the infinitely many possible gradations of
the corresponding quantum affine algebras, such as and
, and explicit formulae are obtained for those two cases.
Spectral-dependent similarity (gauge) transformations relate the -matrices
in different gradations. Nevertheless, the choice of gradation can be
physically significant, as is illustrated in the case of quantum affine Toda
field theories.Comment: 14 pages, Latex, UQMATH-93-10 (final version for publication
Interplay of Spin and Orbital Angular Momentum in the Proton
We derive the consequences of the Myhrer-Thomas explanation of the proton
spin problem for the distribution of orbital angular momentum on the valence
and sea quarks. After QCD evolution these results are found to be in very good
agreement with both recent lattice QCD calculations and the experimental
constraints from Hermes and JLab
Neutralino-hadron scattering in the NMSSM
We provide a scan of the parameter space for neutralino-hadron scattering in
the next-to-minimal supersymmetric standard model using an updated value for
the strange quark sigma commutator. These results also take into account
constraints from WMAP data on the relic density and new constraints from the
Large Hadron Collider. We find that the resultant spin-independent cross
sections are smaller in magnitude than those found in recent results obtained
within the constrained minimal supersymmetric standard model, yet still great
enough to feasibly allow for detection in the case of bino-like neutralinos.Comment: 4 pages 5 figure
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