34,857 research outputs found
Quantum corrections for the MSSM Higgs couplings to SM fermions
Higgs Yukawa couplings to down-type fermions receive, in the MSSM,
supersymmetric quantum corrections that can be of order 1 for large values of
tan\beta, provided \mu \sim MSUSY. Therefore, a sensitive prediction for
observables driven by any of these couplings can only be obtained after an
all-order resummation of the large corrections. We perform this necessary step
and show, as an example, the effect of the resummation on the computation of
the p\bar{p},pp \to t\bar{b}H^{-} + X cross-section and on the branching ratio
BR(b\to s\gamma) at the next-to-leading order.Comment: 12 pp, econf, 6 eps figs. Talk presented at RADCOR 2000, Carmel, CA,
Sept. 200
Multivariate statistical analysis for damage and delamination in composite structures
The article is devoted to the analysis of the vibration response of composite laminates .Our aim is to develop a method for analysis of the vibration response of structures made of composites which will also be used to develop a vibration-based health monitoring procedure for such structures. Composite materials and composite laminates in particular, exhibit complex dynamic behaviour which on most occasions cannot be modelled linearly. Delamination introduces additional nonlinearities in the vibration behaviour of the structure as a result of the interrupted contact between the layers or the opening and closing of the delamination. Thus conventional linear structural dynamics methods like modal analysis cannot be applied. In this study, the vibration response signals are recorded from damaged and non-damaged (healthy) laminated composite beams. The frequency domain signals are subjected to a special type of Principal Component Analysis, known as Multichannel Singular Spectrum Analysis (MSSA). This type of analysis is known to uncover oscillation patterns and was suggested in the investigation in place of modal analysis. The idea is to establish a new feature based state-space for the vibration response signal. The response of the healthy structure is used as a baseline to which all the responses are compared. MSSA decomposes the signal into new components which are lineal combinations of the original frequency series components. The first several components are responsible for most of the variance of the original signal. The new space is with a much smaller dimension as compared to the original data and creates new variables which can be used as damage features. The results demonstrate strong potential for using MSSA for the purpose of structural health monitoring
Electromechanical behavior of BaTiO3 from first principles
Using an effective Hamiltonian parametrized from first principles, Monte
Carlo simulations are performed in order to study the piezoelectric response of
BaTiO3 in the ferroelectric tetragonal phase as a function of temperature. The
effect of an electric field on the phase behavior is also illustrated by a
simulation of the transformation of a rhombohedral domain into a tetragonal one
under a strong field.Comment: 3 pages, two-column style with 3 postscript figures embedded. Uses
REVTEX and epsf macros. Also available at
http://www.physics.rutgers.edu/~dhv/preprints/index.html#ag_pie
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