45 research outputs found
Estimation of conditional laws given an extreme component
Let be a bivariate random vector. The estimation of a probability of
the form is challenging when is large, and a
fruitful approach consists in studying, if it exists, the limiting conditional
distribution of the random vector , suitably normalized, given that
is large. There already exists a wide literature on bivariate models for which
this limiting distribution exists. In this paper, a statistical analysis of
this problem is done. Estimators of the limiting distribution (which is assumed
to exist) and the normalizing functions are provided, as well as an estimator
of the conditional quantile function when the conditioning event is extreme.
Consistency of the estimators is proved and a functional central limit theorem
for the estimator of the limiting distribution is obtained. The small sample
behavior of the estimator of the conditional quantile function is illustrated
through simulations.Comment: 32 pages, 5 figur
Determining the phonon DOS from specific heat measurements via maximum entropy methods
The maximum entropy and reverse Monte-Carlo methods are applied to the
computation of the phonon density of states (DOS) from heat capacity data. The
approach is introduced and the formalism is described. Simulated data is used
to test the method, and its sensitivity to noise. Heat capacity measurements
from diamond are used to demonstrate the use of the method with experimental
data. Comparison between maximum entropy and reverse Monte-Carlo results shows
the form of the entropy used here is correct, and that results are stable and
reliable. Major features of the DOS are picked out, and acoustic and optical
phonons can be treated with the same approach. The treatment set out in this
paper provides a cost-effective and reliable method for studies of the phonon
properties of materials.Comment: Reprint to improve access. 10 pages, 6 figure
Choosing best practices for managing impacts of trawl fishing on seabed habitats and biota
Bottom trawling accounts for almost one quarter of global fish landings but may also have significant and unwanted impacts on seabed habitats and biota. Management measures and voluntary industry actions can reduce these impacts, helping to meet sustainability objectives for fisheries, conservation and environmental management. These include changes in gear design and operation of trawls, spatial controls, impact quotas and effort controls. We review nine different measures and actions and use published studies anda simple conceptual model to evaluate and compare their performance. The risks and benefits of these management measures depend on the extent to which the fishery is already achieving management objectives for target stocks and the characteristics of the management system that is already in place. We offer guidance on identifying best practices for trawl-fisheries management and show that best practices and their likelihood of reducing trawling impacts depend on local, national and regional management objectives and priorities, societal values and resources for implementation. There is no universalbest practice, and multiple management measures and industry actions are required to meet sustainability objectives and improve trade-offs between food production and environmental protection
Comparison of clinical outcome between laparoscopic and open right hemicolectomy: a nationwide study
Narrow resonances in the continuum of the unbound nucleus F
The structure of the unbound F nucleus is investigated using the inverse kinematics resonant scattering of a radioactive O beam impinging on a CH target. The analysis of H(O,p)O and H(O,2p)N reactions allowed the confirmation of the previously observed narrow resonance, near the two-proton decay threshold, and the identification of two new narrow 5/2 and 3/2 resonances. The newly observed levels decay by 1p emission to the ground of O, and by sequential 2p emission to the ground state (g.s.) of N via the resonance of O. Gamow shell model (GSM) analysis of the experimental data suggests that the wave functions of the 5/2 and 3/2 resonances may be collectivized by the continuum coupling to nearby 2p- and 1p- decay channels. The observed excitation function H(O,p)O and resonance spectrum in F are well reproduced in the unified framework of the GSM
Holonic agents for design and manufacturing integration in virtual digital cells
International audienc
Holonic Fuzzy Agents for Integrated CAD Product and Adaptive Manufacturing Cell Formation
International audienc
A method based on metallurgical and micromechanical concepts to calculate the tensile curve of MMCp
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