4,591 research outputs found

    The Library and Remedial/Developmental/Compensatory Education: A Case Study

    Get PDF
    published or submitted for publicatio

    Nonparametric reconstruction of the Om diagnostic to test LCDM

    Full text link
    Cosmic acceleration is usually related with the unknown dark energy, which equation of state, w(z), is constrained and numerically confronted with independent astrophysical data. In order to make a diagnostic of w(z), the introduction of a null test of dark energy can be done using a diagnostic function of redshift, Om. In this work we present a nonparametric reconstruction of this diagnostic using the so-called Loess-Simex factory to test the concordance model with the advantage that this approach offers an alternative way to relax the use of priors and find a possible 'w' that reliably describe the data with no previous knowledge of a cosmological model. Our results demonstrate that the method applied to the dynamical Om diagnostic finds a preference for a dark energy model with equation of state w =-2/3, which correspond to a static domain wall network.Comment: 10 pages, 5 figures, 2 table

    The Possibility of a Non-Lagrangian Theory of Gravity

    Full text link
    General Relativity resembles a very elegant crystal glass: If we touch its principles, that is, its Lagrangian, there is a risk of breaking everything. Or, if we will, it is like a short blanket: Curing some problems creates new problems. This paper is devoted to bring to light the reasons why we pursue the possibility of a non-Lagrangian theory of gravity under the hypothesis of an extension of the original general relativity with an ansatz inspired in the fundamental principles of classical and quantum physics.Comment: 6 pages, 1 figure. Version accepted in Universe MDP

    Blade Sharpness and its Effect on the Testing of Body Armours

    Get PDF
    Factors such as edge sharpness and tip sharpness have been identified by Horsfall,1 as keyvariables in the testing of stab and slash resistant armours. This paper evaluates the influenceof blade sharpness on the mechanics of penetration and its relationship with a variety ofmaterials used for body armour systems. The differences in performance between blunt andsharp blades are compared by dynamic tests using an instrumented drop tower, measuringpeak loads and energy to penetration. Variance in the initial impact forces required topenetrate body armour between blunt and sharp blades is shown. However, the total energyto penetration for both sharp and blunt knives was found to be similar for a specific bodyarmour system. Dynamic tests were also used to evaluate the effect of wear on bladeperformance by the comparison of the initial loads for puncture and depth of penetration onaramid and metallic armour systems. The effect of sharpness on the reproducibility of testresults is also investigated and discussed. Various test methods are described for themeasurement of sharpness for both stab and slash and compared. The recent development ofa new non-destructive proof test method to measure tip and edge sharpness is also described

    Alien Registration- Colley, Celia C. (Portland, Cumberland County)

    Get PDF
    https://digitalmaine.com/alien_docs/26743/thumbnail.jp

    Alien Registration- Colley, Celia C. (Portland, Cumberland County)

    Get PDF
    https://digitalmaine.com/alien_docs/26743/thumbnail.jp
    • …
    corecore