854 research outputs found
A Hermeneutic Phenomenological Study of American and British Military Bandmasters’ Experiences and the Influence on the Development of the American Public School Band Movement
This study investigates the history of British and American Military Bandmasters’ lived experiences through a Phenomenological Hermeneutic Analysis construct to the development of the Public-School Band movement. This thesis aims to provide insight through transcribed interviews, historical documentation, and pre-recorded transcriptions of the thoughts and practical influences of developing the effectiveness of band teacher preparation in American public school band programs. A better understanding of these advances warrants a comprehensive overview of military band history and a sense of how the curriculum process, formation, and growth in British and American Military Bands influenced approaches and philosophical thought through experiences of band instructor training. The participants from this study offer a diverse perspective of British Military Bandmasters, American Military Bandmasters, and public-school band directors’ concepts of band teaching through social developments, cultural attributes, and military guidance, which created military band schools, band curricula, and progressive development for progressive band teacher training of the school band movement
Urban American Indian Community Perspectives on Resources and Challenges for Youth Suicide Prevention
American Indian (AI) youth have some of the highest rates of suicide of any group in the United States, and the majority of AI youth live in urban areas away from tribal communities. As such, understanding the resources available for suicide prevention among urban AI youth is critical, as is understanding the challenges involved in accessing such resources. Pre‐existing interview data from 15 self‐identified AI community members and staff from an Urban Indian Health Organization were examined to understand existing resources for urban AI youth suicide prevention, as well as related challenges. A thematic analysis was undertaken, resulting in three principal themes around suicide prevention: formal resources, informal resources, and community values and beliefs. Formal resources that meet the needs of AI youth were viewed as largely inaccessible or nonexistent, and youth were seen as more likely to seek help from informal sources. Community values of mutual support were thought to reinforce available informal supports. However, challenges arose in terms of the community’s knowledge of and views on discussing suicide, as well as the perceived fit between community values and beliefs and formal prevention models.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/134173/1/ajcp12080.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/134173/2/ajcp12080_am.pd
Catastrophic Consequences of Kicking the Chameleon
The physics of the "dark energy" that drives the current cosmological
acceleration remains mysterious, and the dark sector may involve new light
dynamical fields. If these light scalars couple to matter, a screening
mechanism must prevent them from mediating an unacceptably strong fifth force
locally. Here we consider a concrete example: the chameleon mechanism. We show
that the same coupling between the chameleon field and matter employed by the
screening mechanism also has catastrophic consequences for the chameleon during
the Universe's first minutes. The chameleon couples to the trace of the
stress-energy tensor, which is temporarily non-zero in a radiation-dominated
universe whenever a particle species becomes non-relativistic. These "kicks"
impart a significant velocity to the chameleon field, causing its effective
mass to vary non-adiabatically and resulting in the copious production of
quantum fluctuations. Dissipative effects strongly modify the background
evolution of the chameleon field, invalidating all previous classical
treatments of chameleon cosmology. Moreover, the resulting fluctuations have
extremely high characteristic energies, which casts serious doubt on the
validity of the effective theory. Our results demonstrate that quantum particle
production can profoundly affect scalar-tensor gravity, a possibility not
previously considered. Working in this new context, we also develop the theory
and numerics of particle production in the regime of strong dissipation.Comment: 5 pages, 5 figures; accepted for publication in PR
Gauged Galileons From Branes
We show how the coupling of SO(N) gauge fields to galileons arises from a
probe brane construction. The galileons arise from the brane bending modes of a
brane probing a co-dimension N bulk, and the gauge fields arise by turning on
certain off-diagonal components in the zero mode of the bulk metric. By
construction, the equations of motion for both the galileons and gauge fields
remain second order. Covariant gauged galileons are derived as well.Comment: 6 pages. v2: minor changes, version appearing in PL
Recommended from our members
Two Forms of Spatial Imagery: Neuroimaging Evidence
Spatial imagery may be useful in such tasks as interpreting graphs and solving geometry problems, and even in performing surgery. This study provides evidence that spatial imagery is not a single faculty; rather, visualizing spatial location and mentally transforming location rely on distinct neural networks. Using 3-T functional magnetic resonance imaging, we tested 16 participants (8 male, 8 female) in each of two spatial imagery tasks--one that required visualizing location and one that required mentally rotating stimuli. The same stimuli were used in the two tasks. The location-based task engendered more activation near the occipito-parietal sulcus, medial posterior cingulate, and precuneus, whereas the transformation task engendered more activation in superior portions of the parietal lobe and in the postcentral gyrus. These differences in activation provide evidence that there are at least two different types of spatial imagery.Psycholog
Determination of Somatic and Cancer Stem Cell Self-Renewing Symmetric Division Rate Using Sphere Assays
Representing a renewable source for cell replacement, neural stem cells have received substantial attention in recent years. The neurosphere assay represents a method to detect the presence of neural stem cells, however owing to a deficiency of specific and definitive markers to identify them, their quantification and the rate they expand is still indefinite. Here we propose a mathematical interpretation of the neurosphere assay allowing actual measurement of neural stem cell symmetric division frequency. The algorithm of the modeling demonstrates a direct correlation between the overall cell fold expansion over time measured in the sphere assay and the rate stem cells expand via symmetric division. The model offers a methodology to evaluate specifically the effect of diseases and treatments on neural stem cell activity and function. Not only providing new insights in the evaluation of the kinetic features of neural stem cells, our modeling further contemplates cancer biology as cancer stem-like cells have been suggested to maintain tumor growth as somatic stem cells maintain tissue homeostasis. Indeed, tumor stem cell's resistance to therapy makes these cells a necessary target for effective treatment. The neurosphere assay mathematical model presented here allows the assessment of the rate malignant stem-like cells expand via symmetric division and the evaluation of the effects of therapeutics on the self-renewal and proliferative activity of this clinically relevant population that drive tumor growth and recurrence
Constraints on Galileon-induced precessions from solar system orbital motions
We use latest data from solar system planetary orbital motions to put
constraints on some Galileon-induced precessional effects. Due to the
Vainshtein mechanism, the Galileon-type spherically symmetric field of a
monopole induces a small, screened correction proprtional to \sqrt{r} to its
usual r^-1 Newtonian potential which causes a secular precession of the
pericenter of a test particle. In the case of our solar system, latest data
from Mars allow to constrain the magnitude of such an interaction down to
\alpha <= 0.3 level. Another Galileon-type effect which might impact solar
system dynamics is due to an unscreened constant gradient induced by the
peculiar motion of the Galaxy. The magnitude of such an effect, depending on
the different gravitational binding energies of the Sun and the planets, is \xi
<= 0.004 from the latest bounds on the supplementary perihelion precession of
Saturn.Comment: LaTex2e, 11 pages, 1 table, no figures, 35 references. To appear in
Journal of Cosmology and Astroparticle Physics (JCAP
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