2,744 research outputs found
Study of a navigation and traffic control technique employing satellites. Volume 3 - User hardware Interim report
User hardware configurations and requirements for navigation and air traffic control technique using satellite
Glucocorticoid receptor action in metabolic and neuronal function [version 1; referees: 3 approved]
Glucocorticoids via the glucocorticoid receptor (GR) have effects on a variety of cell types, eliciting important physiological responses via changes in gene expression and signaling. Although decades of research have illuminated the mechanism of how this important steroid receptor controls gene expression using in vitro and cell culture–based approaches, how GR responds to changes in external signals in vivo under normal and pathological conditions remains elusive. The goal of this review is to highlight recent work on GR action in fat cells and liver to affect metabolism in vivo and the role GR ligands and receptor phosphorylation play in calibrating signaling outputs by GR in the brain in health and disease. We also suggest that both the brain and fat tissue communicate to affect physiology and behavior and that understanding this “brain-fat axis” will enable a more complete understanding of metabolic diseases and inform new ways to target them
An analytical model for bore-driven run-up
We use a hodograph transformation and a boundary integral method to derive a new analytical solution to the shallow-water equations describing bore-generated run-up on a plane beach. This analytical solution differs from the classical Shen-Meyer runup solution in giving significantly deeper and less asymmetric swash flows, and also by predicting the inception of a secondary bore in both the backwash and the uprush in long surf. We suggest that this solution provides a significantly improved model for flows including swash events and the run-up following breaking tsunamis
Study of a navigation and traffic control technique employing satellites. Volume 5 - Addendum. Traffic control data links Final report
Data links for air traffic control capability by satellites of NAVSTAR syste
The applications of satellites to communications, navigation and surveillance for aircraft operating over the contiguous United States. Volume 1 - Technical report
Satellite applications to aircraft communications, navigation, and surveillance over US including synthesized satellite network and aircraft equipment for air traffic contro
Coincidence of length spectra does not imply isospectrality
Penrose--Lifshits mushrooms are planar domains coming in nonisometric pairs
with the same geodesic length spectrum. Recently S. Zelditch raised the
question whether such billiards also have the same eigenvalue spectrum for the
Dirichlet Laplacian (conjecturing ``no''). Here we show that generically (in
the class of smooth domains) the two members of a mushroom pair have different
spectra.Comment: 8 pages, 5 figure
Limb Regeneration in Horseshoe Crabs
Horseshoe crabs, like many invertebrates, are able to regenerate ablated appendages. It was hypothesized that ependymin and/or juvenile hormone would contribute to regeneration at ablation sites and could be demonstrated by immunohistochemistry. Ablated appendages and regenerated stumps were examined by light and electron microscopy. The post-ablation tissue retracts into the remaining limb where new shell is formed in between two layers of living tissue. JH immunoreactivity was found in blood cells in the regenerating stumps. Anti-EPN immunoreactivity was not detected
Relic Radiation from an Evaporating Black Hole
We present a non-string-theoretic calculation of the microcanonical entropy
of relic integer-spin Hawking radiation -- at fixed total energy . The only
conserved macroscopic quantity is the total energy (the total energy of the
relic radiation). Data for a boundary-value approach, with massless,
integer-spin perturbations, are set on initial and final space-like
hypersurfaces. In the resulting 1-dimensional statistical-mechanics problem,
the real part of the (complex) time separation at spatial infinity, , is the variable conjugate to the total
energy. We count the number of weak-field configurations on the final
space-like hypersurface with energy . One recovers the Cardy formula and the
Bekenstein-Hawking entropy, if Re(T) is of the order of the black-hole life-
time, leading to a statistical interpretation of black-hole entropy. The
microcanonical entropy includes a logarithmic correction to the black-hole area
law, which is {\it universal} (independent of black-hole parameters). Here, the
discreteness of the energy levels is crucial. This approach is compared with
that of string theory for the transition to the fundamental-string r\'egime in
the final stages of evaporation. The squared coupling, , regulating the
transition to a highly-excited string state and {\it vice versa}, can be
related to the angle, , of complex-time rotation above. The
strong-coupling r\'egime corresponds to a Euclidean black hole, while the
physical limit of a Lorentzian space-time (as ) corresponds to
the weak-coupling r\'egime. This resembles the transition to a highly-excited
string-like state which subsequently decays into massless particles, thereby
avoiding the naked singularity.Comment: To appear in International Journal of Modern Physics
Liouville field theory with heavy charges. II. The conformal boundary case
We develop a general technique for computing functional integrals with fixed
area and boundary length constraints. The correct quantum dimensions for the
vertex functions are recovered by properly regularizing the Green function.
Explicit computation is given for the one point function providing the first
one loop check of the bootstrap formula.Comment: LaTeX 26 page
Negotiating Secure Land Tenure Through Community Redevelopment: A case study from the Klong Toey Slum in Bangkok
The Rim Klong Wat Sapan community, located in the Klong Toey slum of Bangkok, Thailand, is currently in danger of being evicted by their land owner. One known way to cope with this threat is through redevelopment. We established a generic redevelopment process by which slum communities can organize to resist eviction, and created a guidebook explaining how to use this process. We then adapted this process to the specific needs and desires of the Rim Klong Wat Sapan community
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