1,131 research outputs found
Bottom-quark associated Higgs-boson production: reconciling the four- and five-flavour scheme approach
The main arguments in the discussion of the proper treatment of the total
inclusive cross section for bottom-quark associated Higgs-boson production are
briefly reviewed. A simple and pragmatic formula for the combination of the
so-called four- and five-flavour schemes is suggested, including the treatment
of the respective theory error estimates. The numerical effects of this
matching formula are discussed.Comment: 8 pages, 4 figure
Higgs Boson Searches with ATLAS based on 2010 Data
The results of Higgs Boson searches with the ATLAS detector based on 2010
proton proton collision data corresponding to integrated luminosities of up to
39 pb-1are presented. Searches for H --> 2 photons, H --> W+W- --> l+l- 2
neutrinos and H --> ZZ --> l+l- 2 neutrinos / l+l- qqbar in the context of the
Standard Model (SM), for H--> tau+ tau- in the context of the Minimal
Supersymmetric Extension of the Standard Model (MSSM) and for a generic scalar
at low mass in the vicinity of the Ypsilon resonance decaying to a pair of
muons are discussed. All observations are in agreement with the expectations
from the background-only hypothesis. Hence exclusion limits at 95% confidence
level are derivedComment: 6 pages, 15 figures, contribution to the proceedings of the XLVIth
Rencontres de Moriond session devoted to Electroweak Interactions and Unified
Theorie
Simultaneous normal faulting and extensional flexuring during rifting: an example from the southernmost Upper Rhine Graben
The southern end of the Upper Rhine Graben (URG) is formed by a major continental transfer zone, which was localised by the reactivation of ENE-oriented basement faults of Late Palaeozoic origin. A combination of subcrop data (derived from exploration wells and reflection seismic lines) and palaeostress analysis provided new constraints on the timing and kinematics of interacting basement faults. Rifting in the southern URG began in the Upper Priabonian under regional WNW-ESE-directed extension, oriented roughly perpendicular to the graben axis. In the study area, this led to the formation of NNE-trending half-grabens. Simultaneously, ENE-trending basement faults, situated in the area of the future Rhine-Bresse Transfer Zone (RBTZ), were reactivated in a sinistrally transtensive mode. In the sedimentary cover the strike-slip component was accommodated by the development of en-échelon aligned extensional flexures. Flexuring and interference between the differently oriented basement faults imposed additional, but locally confined extension in the sedimentary cover, which deviated by as much as 90° from the regional WNW-ESE extension. The interference of regional and local stresses led to a regime approaching radial extension at the intersection between the URG and RBT
A Comparative Evaluation of Quantification Methods
Quantification represents the problem of predicting class distributions in a
given target set. It also represents a growing research field in supervised
machine learning, for which a large variety of different algorithms has been
proposed in recent years. However, a comprehensive empirical comparison of
quantification methods that supports algorithm selection is not available yet.
In this work, we close this research gap by conducting a thorough empirical
performance comparison of 24 different quantification methods. To consider a
broad range of different scenarios for binary as well as multiclass
quantification settings, we carried out almost 3 million experimental runs on
40 data sets. We observe that no single algorithm generally outperforms all
competitors, but identify a group of methods including the Median Sweep and the
DyS framework that perform significantly better in binary settings. For the
multiclass setting, we observe that a different, broad group of algorithms
yields good performance, including the Generalized Probabilistic Adjusted
Count, the readme method, the energy distance minimization method, the EM
algorithm for quantification, and Friedman's method. More generally, we find
that the performance on multiclass quantification is inferior to the results
obtained in the binary setting. Our results can guide practitioners who intend
to apply quantification algorithms and help researchers to identify
opportunities for future research
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