9,264 research outputs found
Top quark property measurements in single top
A review of the recent results on measurements of top quark properties in
single top quark events using data samples of proton proton collisions produced
by the LHC at sqrt(s) = 7 and 8 TeV and collected by ATLAS and CMS detectors is
presented, including the top quark polarization, the W boson helicity, searches
for anomalous Wtb couplings and the top quark mass. The measurements are in
good agreement with predictions and no deviations from Standard Model
expectations have been observed.Comment: TOP2016 conference proceeding
Motion-Based Design of Passive Damping Devices to Mitigate Wind-Induced Vibrations in Stay Cables
Wind action can induce large amplitude vibrations in the stay cables of bridges. To reduce
the vibration level of these structural elements, different types of passive damping devices are
usually installed. In this paper, a motion-based design method is proposed and implemented in
order to achieve the optimum design of different passive damping devices for stay cables under
wind action. According to this method, the design problem is transformed into an optimization
problem. Thus, its main aim is to minimize the different terms of a multi-objective function,
considering as design variables the characteristic parameters of each considered passive damping
device. The multi-objective function is defined in terms of the scaled characteristic parameters,
one single-function for each parameter, and an additional function that checks the compliance of
the considered design criterion. Genetic algorithms are considered as a global optimization method.
Three passive damping devices have been studied herein: viscous, elastomeric and friction dampers.
As a benchmark structure, the Alamillo bridge (Seville, Spain), is considered in order to validate
the performance of the proposed method. Finally, the parameters of the damping devices designed
according to this proposal are successfully compared with the results provided by a conventional
design method
A Phragm\'en-Lindel\"of theorem via proximate orders, and the propagation of asymptotics
We prove that, for asymptotically bounded holomorphic functions in a sector
in , an asymptotic expansion in a single direction towards the
vertex with constraints in terms of a logarithmically convex sequence admitting
a nonzero proximate order entails asymptotic expansion in the whole sector with
control in terms of the same sequence. This generalizes a result by A. Fruchard
and C. Zhang for Gevrey asymptotic expansions, and the proof strongly rests on
a suitably refined version of the classical Phragm\'en-Lindel\"of theorem, here
obtained for functions whose growth in a sector is specified by a nonzero
proximate order in the sense of E. Lindel\"of and G. Valiron.Comment: 20 page
Indices of O-regular variation for weight functions and weight sequences
A plethora of spaces in Functional Analysis (Braun-Meise-Taylor and Carleman
ultradifferentiable and ultraholomorphic classes; Orlicz, Besov, Lipschitz,
Lebesque spaces, to cite the main ones) are defined by means of a weighted
structure, obtained from a weight function or sequence subject to standard
conditions entailing desirable properties (algebraic closure, stability under
operators, interpolation, etc.) for the corresponding spaces. The aim of this
paper is to stress or reveal the true nature of these diverse conditions
imposed on weights, appearing in a scattered and disconnected way in the
literature: they turn out to fall into the framework of O-regular variation,
and many of them are equivalent formulations of one and the same feature.
Moreover, we study several indices of regularity/growth for both functions and
sequences, which allow for the rephrasing of qualitative properties in terms of
quantitative statements.Comment: 37 page
The surjectivity of the Borel mapping in the mixed setting for ultradifferentiable ramification spaces
We consider r-ramification ultradifferentiable classes, introduced by J.
Schmets and M. Valdivia in order to study the surjectivity of the Borel map,
and later on also exploited by the authors in the ultraholomorphic context. We
characterize quasianalyticity in such classes, extend the results of Schmets
and Valdivia about the image of the Borel map in a mixed ultradifferentiable
setting, and obtain a version of the Whitney extension theorem in this
framework.Comment: 31 pages; this version has been accepted for publication in Monatsh.
Mat
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