5,496 research outputs found
Prophetic Preaching: A Pastoral Approach
Title: Prophetic preaching : a pastoral approach. Author: Leonora Tubbs Tisdale. Publisher: Louisville, Ky. : Westminster John Knox Press, ©2010. ISBN: 978066423332
Novel Preaching: Tips from Top Writers on Crafting Creative Sermons
Title: Novel preaching: tips from top writers on crafting creative sermons. Author: Alyce M McKenzie. Publisher: Louisville, Ky.: Westminster John Knox Press, ©2010. ISBN: 978066423322
Mediated Contests and Strategic Foundations for Contest Success Functions
This paper examines the foundations of arbitrary contest success functions (CSFs) in two distinct types of contests – unmediated and mediated contests. In an unmediated contest, CSFs arise as the (interim) players’ equilibrium beliefs of a two-stage game – the gun-butter game – in which players choose an activity (appropriative vs. productive) in the first stage, and apply effort to their activity in the second stage. In this view a CSF is rationalizable if a contest is induced on the equilibrium path of the gun-butter game. In the second approach, a CSF is the result of the optimal design of an administrator. Here, the designer seeks to maximize his utility by implementing a probability distribution on the set of contestants. However, he is curbed by a disutility term which represents the underlying institutional constraints or the designer’s preferences. Both approaches provide foundations for arbitrary CSFs with no restrictions on the number of contestants.Induced contests; Gun-butter game; Control costs
Inter and intra-group conflicts as a foundation for contest success functions
This paper introduces a notion of partitioned correlated equilibrium that extends Aumann's correlated equilibrium concept (1974, 1987). This concept captures the non-cooperative interactions arising simultaneously within and between groups. We build on this notion in order to provide a foundation for contest success functions (CSFs) in a game wherein contests arise endogenously. Our solution concept and analysis are general enough to give a foundation for any model of contest using standard equilibrium concepts like e.g., Nash, Bayesian-Nash or Perfect-Nash equilibria. In our environment, popular CSFs can be interpreted as a list of equilibrium conjectures held by players whenever they contemplate deviating from the ``peaceful outcome'' of the ``group formation game''. Our setup allows to relate the form of prominent CSFs with some textbook examples of quasi-linear utility functions, social utility functions in the spirit of Fehr and Schmidt (1999) and non-expected models of utility a la Quiggin (1981, 1982). We also show that our framework can accommodate situations in which agents cannot correlate their actions.Contest success functions; Correlated equilibrium; Inter and intra-group conflicts; Induced contests
Metal enrichment in galactic winds
Observations give evidences of the presence of metals in the intergalactic
medium (IGM). The stars responsible for transforming hydrogen and helium into
more complex atoms do not form outside the galaxies in the standard scenario of
galaxy formation. Supernovae-driven winds and their associated feedback was
proposed as a possible solution to explain such enrichment of the IGM. It
turned out that a proper modelling of supernovae explosions within a turbulent
interstellar medium (ISM) is a difficult task. Recent advances have been
obtained using a multiphase approach to solve for the thermal state of the ISM,
plus some additional recipes to account for the kinetic effect of supernovae on
the galactic gas. We briefly describe here our implementation of supernovae
feedback within the RAMSES code, and apply it to the formation and evolution of
isolated galaxies of various masses and angular momenta. We have explored under
what conditions a galactic wind can develop, if one considers only a quiescent
mode of star formation. We have also characterized the distribution and
evolution of metallicity in the gas outflow spreading in the IGM.Comment: 6 pages, 6 figures, To appear in the proceedings of the
CRAL-Conference Series I "Chemodynamics: from first stars to local galaxies",
Lyon 10-14 July 2006, France, Eds. Emsellem, Wozniak, Massacrier, Gonzalez,
Devriendt, Champavert, EAS Publications Serie
Hyperbolicity of varieties supporting a variation of Hodge structure
We generalize former results of Zuo and the first author showing some
hyperbolicity properties of varieties supporting a variation of Hodge
structure. Our proof only uses the special curvature properties of period
domains. In particular, in contrast to the former approaches, it does not use
any result on the asymptotic behaviour of the Hodge metric
An implicit scheme for solving the anisotropic diffusion of heat and cosmic rays in the RAMSES code
Astrophysical plasmas are subject to a tight connection between magnetic
fields and the diffusion of particles, which leads to an anisotropic transport
of energy. Under the fluid assumption, this effect can be reduced to an
advection-diffusion equation augmenting the equations of magnetohydrodynamics.
We introduce a new method for solving the anisotropic diffusion equation using
an implicit finite-volume method with adaptive mesh refinement and adaptive
time-stepping in the RAMSES code. We apply this numerical solver to the
diffusion of cosmic ray energy, and diffusion of heat carried by electrons,
which couple to the ion temperature. We test this new implementation against
several numerical experiments and apply it to a simple supernova explosion with
a uniform magnetic field.Comment: 11 pages, 10 figures, A&
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