3,753 research outputs found
Imbedding Christian Values in the Public Education Setting: Creating a Democratic Classroom Environment
This article supports the need for Christian education in the sustainment of democracy and discusses the opportunity for Christian values to be implicitly imbedded into classroom through the creation of a democratic forum. This nation was founded on Christian principles. While the basis of today’s public education setting includes a basic understanding of the core skills (reading, writing and basic arithmetic), these skills alone are not enough for a student to achieve success. A student must also learn, through the education and spiritual process, courage, confidence and life skills in order to survive in today’s society. Furthermore, the ability to apply the core skills is necessary in order for an individual to fully achieve his or her potential. Through education and spirituality, an individual undergoes a transformation, gaining an understanding and appreciation of the world
Black Holes and Galactic Density Cusps Spherically Symmetric Anisotropic Cusps
Aims: In this paper we study density cusps that may contain central black
holes. The actual co-eval self-similar growth would not distinguish between the
central object and the surroundings. Methods: To study the environment of a
growing black hole we seek descriptions of steady `cusps' that may contain a
black hole and that retain at least a memory of self-similarity. We refer to
the environment in brief as the `bulge' and on smaller scales, the `halo'.
Results: We find simple descriptions of the simulations of collisionless matter
by comparing predicted densities, velocity dispersions and distribution
functions with the simulations. In some cases central point masses may be
included by iteration. We emphasize that the co-eval self-similar growth allows
an explanation of the black hole bulge mass correlation between approximately
similar collisionless systems. Conclusions: We have derived our results from
first principles assuming adiabatic self-similarity and either self-similar
virialisation or normal steady virialisation. We conclude that distribution
functions that retain a memory of self-similar evolution provide an
understanding of collisionless systems. The implied energy relaxation of the
collisionless matter is due to the time dependence. Phase mixing relaxation may
be enhanced by clump-clump interactions.Comment: 9 pp, 3 figs, accepted by A\&
Nature and Nurture in Dark Matter Halos
Cosmological simulations consistently predict specific properties of dark
matter halos, but these have not yet led to a physical understanding that is
generally accepted. This is especially true for the central regions of these
structures. Recently two major themes have emerged. In one, the dark matter
halo is primarily a result of the sequential accretion of primordial structure
(ie `Nature'); while in the other, dynamical relaxation (ie `Nurture')
dominates at least in the central regions. Some relaxation is however required
in either mechanism. In this paper we accept the recently established
scale-free sub-structure of halos as an essential part of both mechanisms.
Consequently; a simple model for the central relaxation based on a self-similar
cascade of tidal interactions, is contrasted with a model based on the
accretion of adiabatically self-similar, primordial structure. We conclude that
a weak form of this relaxation is present in the simulations, but that is
normally described as the radial orbit instability.Comment: 25 pages, 3 figures, fig with parts 1 to d, fig 3 with parts a to
Black holes and Galactic density cusps -- I. Radial orbit cusps and bulges
In this paper, we study the distribution functions that arise naturally
during self-similar radial infall of collisionless matter. Such matter may be
thought of either as stars or as dark matter particles. If a rigorous steady
state is assumed, then the system is infinite and is described by a universal
distribution function given the self-similar index. The steady logarithmic
potential case is exceptional and yields the familiar Gaussian for an infinite
system with an inverse-square density profile. We show subsequently that for
time-dependent radial self-similar infall, the logarithmic case is accurately
described by the Fridmann and Polyachenko distribution function. The system in
this case is finite but growing. We are able to embed a central mass in the
universal steady distribution only by iteration, except in the case of massless
particles. The iteration yields logarithmic corrections to the massless
particle case and requires a `renormalization' of the central mass. A central
spherical mass may be accurately embedded in the Fridmann and Polyachenko
growing distribution however. Some speculation is given concerning the
importance of radial collisionless infall in actual galaxy formation.Comment: 10 pp, 3 fig
Gestion des conflits sur les pompes à main dans les villages du Burkina Faso
Version anglaise disponible dans la Bibliothèque numérique du CRDI: Burkina Faso : managing conflict at the village handpump and beyon
Reducing maternal and infant mortality in Indonesia
French version available in IDRC Digital Library: Réduire les taux de mortalité maternelle et infantile en Indonési
Fishing for less mercury in the Amazon
French version available in IDRC Digital Library: Moins de mercure dans l'AmazoneSpanish version available in IDRC Digital Library: Lucha contra la contaminación del mercurio en el Amazona
Lucha contra la contaminación del mercurio en el Amazonas
Versión en inglés disponible en la Biblioteca Digital del IDRC: Fishing for less mercury in the AmazonVersión en francés disponible en la Biblioteca Digital del IDRC: Moins de mercure dans l'Amazon
Santé publique conjuguée à l'intérêt du secteur privé pour prévenir le paludisme
Version anglaise disponible dans la Bibliothèque numérique du CRDI: Preventing malaria : mixing public health interest with private profi
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