3,671 research outputs found
Operation of the T2K time projection chambers
The three time projection chambers of the T2K near detector are micro pattern
gaseous detectors based on bulk micromegas technology. They have been operated
successfully during the first two physics runs of the experiment. Their design,
operation, and performance are presented.Comment: 9 pages, 9 figures, proceedings of MPGD2011, submitted to JINS
Weak in Space, Log in Time Improvement of the Lady{\v{z}}enskaja-Prodi-Serrin Criteria
In this article we present a Lady{\v{z}}enskaja-Prodi-Serrin Criteria for
regularity of solutions for the Navier-Stokes equation in three dimensions
which incorporates weak norms in the space variables and log improvement
in the time variable.Comment: 14 pages, to appea
Relative entropy and the stability of shocks and contact discontinuities for systems of conservation laws with non BV perturbations
We develop a theory based on relative entropy to show the uniqueness and L^2
stability (up to a translation) of extremal entropic Rankine-Hugoniot
discontinuities for systems of conservation laws (typically 1-shocks, n-shocks,
1-contact discontinuities and n-contact discontinuities of large amplitude)
among bounded entropic weak solutions having an additional trace property. The
existence of a convex entropy is needed. No BV estimate is needed on the weak
solutions considered. The theory holds without smallness condition. The
assumptions are quite general. For instance, strict hyperbolicity is not needed
globally. For fluid mechanics, the theory handles solutions with vacuum.Comment: 29 page
Uniqueness and weak-BV stability for conservation laws
Let a 1-d system of hyperbolic conservation laws, with two unknowns, be
endowed with a convex entropy. We consider the family of small functions
which are global solutions of this equation. For any small initial data,
such global solutions are known to exist. Moreover, they are known to be unique
among solutions verifying either the so-called Tame Oscillation Condition,
or the Bounded Variation Condition on space-like curves. In this paper, we show
that these solutions are stable in a larger class of weak (and possibly not
even ) solutions of the system. This result extends the classical
weak-strong uniqueness results which allow comparison to a smooth solution.
Indeed our result extends these results to a weak- uniqueness result, where
only one of the solutions is supposed to be small , and the other solution
can come from a large class. As a consequence of our result, the Tame
Oscillation Condition, and the Bounded Variation Condition on space-like curves
are not necessary for the uniqueness of solutions in the theory, in the
case of systems with 2 unknowns. The method is based. It builds up from
the theory of a-contraction with shifts, where suitable weight functions
are generated via the front tracking method.Comment: 25 pages, 1 figur
Studies on the fungal diseases in crustaceans I. Lagenidum scyllae sp. nov. isolated from cultivated ova and larvae of the mangrove crab (Scylla serrata)
Modelling of super-heated steam drying of alfalfa. COST-915 Copernicus CIPA-CT94--0120 workshop on Food Quality Modellin
Limitations of self-reported estimates of functional capacity using the Walking Impairment Questionnaire
OBJECTIVE: A potential issue with the Walking Impairment Questionnaire (WIQ) is that it is relatively complex. We estimated the number of errors made by patients when self-completing the WIQ, and assessed the benefit of correcting missing, duplicate or paradoxical (i.e., reported lower difficulty for a higher-intensity task) answers.DESIGN: Prospective non-interventional study. MATERIALS: All consecutive new patients with claudication over a 3-month period. METHODS: The WIQ was self-completed before patients performed a constant-load treadmill walking test (maximised to 750 m). MAIN OUTCOME MEASURE: We analysed the coefficient of determination of the linear relationship between overall WIQ score (mean of the available subscales when at least two subscales are available) and treadmill maximal walking distance (MWD), before and after correction of errors. RESULTS: We studied 73 patients. Thirty-seven questionnaires had to be corrected for one or more errors. The coefficient of determination between the overall WIQ score and MWD was R(2) = 0.391 (n = 56) and R(2) = 0.426 (n = 73) before and after correction, respectively. CONCLUSION: Supervision of self-completed WIQs detects errors in almost half of the questionnaires, resulting in a missing overall WIQ score in 23% of cases among uncorrected questionnaires. The overall WIQ score correlates only moderately with MWD, even after correction
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