11,210 research outputs found
A strong triangle inequality in hyperbolic geometry
For a triangle in the hyperbolic plane, let denote the
angles opposite the sides , respectively. Also, let be the height of
the altitude to side . Under the assumption that can
be chosen uniformly in the interval and it is given that
holds approximately 79\% of the time. To accomplish this, we prove a
number of theoretical results to make sure that the probability can be computed
to an arbitrary precision, and the error can be bounded
Fearless: Professor Janet Powers and Linnea Goebel
This week we would like to recognize Professor Janet Powers and recent graduate Linnea Goebel ’13 for their work in Bosnia this summer helping to set up a group of female embroiderers with an Amazon Marketplace account to sell their wares on the internet. [excerpt
Determination of space shuttle flow field by the three-dimensional method of characteristics
The newly improved three-dimensional method of characteristics program has been applied successfully to the calculation of flow fields over a variety of bodies including slab delta wings and shuttle orbiters. Flow fields over fuselage shapes for Mach numbers as low as 1.5 have been calculated. Some typical results are presented
Feasibility study of LITVC for shuttle SRB
A liquid injection thrust vector control (LITVC) system for the shuttle solid rocket booster (SRB) was analyzed. The LITVC was compared with the SRB baseline flexible seal. A table of LITVC advantages and disadvantages is presented. It is concluded that the LITVC performs well at low to moderate duty cycles, but not for high duty cycle requirements
Axioms for consensus functions on the n-cube
An elementary general result is proved that allows for simple
characterizations of well-known location/consensus functions (median, mean and
center) on the n-cube. In addition, alternate new characterizations are given
for the median and anti-median functions on the n-cube.Comment: 12 page
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The climate change double whammy: Flood damage and the determinants of flood insurance coverage, the case of post-Katrina New Orleans
This paper advances scholarly debate on the contradictions of environmental risk management measures by analyzing the determinants of flood insurance coverage among a sample of 403 residents in New Orleans, a city undergoing rapid transformation due to post-Katrina rebuilding efforts and anthropogenic modifications of climate, hydrology, and ecology. The paper focuses on several predictors including subjective flood risk perception, trust in government officials, sociodemographic characteristics, and experience with flood damage. Using binary logistic regression, the results show that the likelihood of having flood insurance coverage is associated with past flood damage and socioeconomic status. Older people (over age 65) are more likely to have flood insurance than younger residents. Race, gender, trust, and perceived flood risk are not statistically significant predictors of flood insurance. We connect our findings to the paradoxes and conflictual dynamics of flood insurance, a major risk mitigation measure. As we point out, in flood-prone cities like New Orleans, flood insurance operates as a double whammy: uninsured or underinsured homes face pervasive risk of both flooding and rising insurance premiums under the conditions of global climate change
Measure Factors, Tension, and Correlations of Fluid Membranes
We study two geometrical factors needed for the correct construction of
statistical ensembles of surfaces. Such ensembles appear in the study of fluid
bilayer membranes, though our results are more generally applicable. The naive
functional measure over height fluctuations must be corrected by these factors
in order to give correct, self-consistent formulas for the free energy and
correlation functions of the height. While one of these corrections -- the
Faddeev-Popov determinant -- has been studied extensively, our derivation
proceeds from very simple geometrical ideas, which we hope removes some of its
mystery. The other factor is similar to the Liouville correction in string
theory. Since our formulas differ from those of previous authors, we include
some explicit calculations of the effective frame tension and two-point
function to show that our version indeed secures coordinate-invariance and
consistency to lowest nontrivial order in a temperature expansion.Comment: 24 pp; plain Te
Active site studies on blood proteases
Issued as Final report, Project no. G-33-L02 (continuation of G-33-L01; continued by G-33-L03
Fracking and Federalism: Support for an Adaptive Approach That Avoids the Tragedy of the Regulatory Commons
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