4,079 research outputs found
Learning from Kaupapa MÄori: Issues and techniques for engagement
This article argues for recognition of the value and relevance of Indigenous knowledges about principles and practices of engagement to theory-building and praxis in public relations. Specifically, in this article, the Kaupapa MÄori body of knowledge and practice that has developed around Indigenous/non-Indigenous engagement in Aotearoa is identified as a valid source of insight for the analogous situation of organisation-public engagement where power imbalance is inherent
The Formation of Star Clusters II: 3D Simulations of Magnetohydrodynamic Turbulence in Molecular Clouds
(Abridged) We present a series of decaying turbulence simulations that
represent a cluster-forming clump within a molecular cloud, investigating the
role of magnetic fields on the formation of potential star-forming cores. We
present an exhaustive analysis of numerical data from these simulations that
includes a compilation of all of the distributions of physical properties that
characterize bound cores - including their masses, radii, mean densities,
angular momenta, spins, magnetizations, and mass-to-flux ratios. We also
present line maps of our models that can be compared with observations. Our
simulations range between 5-30 Jeans masses of gas, and are representative of
molecular cloud clumps with masses between 100-1000 solar masses. The cores
have mass-to-flux ratios that are generally less than that of the original
cloud, and so a cloud that is initially highly supercritical can produce cores
that are slightly supercritical, similar to that seen by Zeeman measurements of
molecular cloud cores. Clouds that are initially only slightly supercritical
will instead collapse along the field lines into sheets, and the cores that
form as these sheets fragment have a different mass spectrum than what is
observed. The spin rates of these cores suggests that subsequent fragmentation
into multiple systems is likely. The sizes of the bound cores that are produced
are typically 0.02-0.2 pc and have densities in the range 10^4-10^5 cm^{-3} in
agreement with observational surveys. Finally, our numerical data allow us to
test theoretical models of the mass spectrum of cores, such as the turbulent
fragmentation picture of Padoan-Nordlund. We find that while this model gets
the shape of the core mass spectrum reasonably well, it fails to predict the
peak mass in the core mass spectrum.Comment: Accepted by MNRAS. 28 pages, 16 figures. Substantial revision since
last versio
Alien Registration- Tilley, Loretta E. (Houlton, Aroostook County)
https://digitalmaine.com/alien_docs/34892/thumbnail.jp
Innovations in the design of an architectural engineering curriculum
This paper introduces a new curriculum, launched in October 2021, in Architectural Engineering, designed out of London, UK for implementation in Giza, Egypt. The developers of this newly formed higher education institution, Newgiza University, sought to introduce more contemporary approaches as well as cutting-edge curricular innovations to the education landscape in Egypt. To achieve this, they enlisted curriculum developers in architecture and engineering from University College London who have expertise in education research, curricular innovation, and the delivery of engineering and architecture modules and degree programs. The team worked in collaboration with experts and educators from Egypt to create a bespoke curriculum, drawing from a range of innovative approaches and educational theories, combining these with many well-established approaches. This paper, which represents the āscholarship of integrationā, highlights distinctive aspects of the curriculum, and illustrates how prior research was integrated into the curriculum design, with a focus on the first year. The paper is geared toward design educators as well as curriculum developers
Local contribution of a quantum condensate to the vacuum energy density
We evaluate the local contribution g_[mu nu]L of coherent matter with
lagrangian density L to the vacuum energy density. Focusing on the case of
superconductors obeying the Ginzburg-Landau equation, we express the
relativistic invariant density L in terms of low-energy quantities containing
the pairs density. We discuss under which physical conditions the sign of the
local contribution of the collective wave function to the vacuum energy density
is positive or negative. Effects of this kind can play an important role in
bringing about local changes in the amplitude of gravitational vacuum
fluctuations - a phenomenon reminiscent of the Casimir effect in QED.Comment: LaTeX, 8 pages. Final journal versio
Gravitational waves in preheating
We study the evolution of gravitational waves through the preheating era that
follows inflation. The oscillating inflaton drives parametric resonant growth
of scalar field fluctuations, and although super-Hubble tensor modes are not
strongly amplified, they do carry an imprint of preheating. This is clearly
seen in the Weyl tensor, which provides a covariant description of
gravitational waves.Comment: 8 pages, 8 figures, Revte
- ā¦