103,014 research outputs found
The Correlation of Dental Arch Width and Ethnicity
This study sought to demonstrate a correlation between arch width, ethnic background, individual height, weight, and whether orthodontic treatment had been rendered. Conclusions revealed that arch widths were significantly larger (p= 0.002 for the mandible and p= 0.008 for the maxilla) in non-Whites than in Whites. In addition, arch widths of the mandible were significantly larger in individuals who had had orthodontic treatment compared to those who had not (p=0.005). This did not carry through to those arch widths in the maxilla of orthodontic versus nonorthodontic care (p=0.258)
Ditching investigation of a 1/20-scale model of the space shuttle orbiter
The ditching characteristics of the space shuttle orbiter were examined. Tests were made with a 1/20-scale model in order to determine behavior patterns and accelerations imparted to the ditching vehicle. Ditchings were made with different configurations of weight and gear position. Also the effects of different water surface conditions were investigated. The test results indicated that the favorable conditions for ditching usually involve a landing attitude of 12 deg. Smooth ditchings were always associated with the landing-gear retracted and never with the landing-gear extended. Higher landing mass, generally, resulted in higher acceleration values in both the longitudinal and normal directions. Surface waves tend to increase the pitch accelerations but at the same time tend to reduce the accelerations in the longitudinal and normal directions
Neural-inspired sensors enable sparse, efficient classification of spatiotemporal data
Sparse sensor placement is a central challenge in the efficient
characterization of complex systems when the cost of acquiring and processing
data is high. Leading sparse sensing methods typically exploit either spatial
or temporal correlations, but rarely both. This work introduces a new sparse
sensor optimization that is designed to leverage the rich spatiotemporal
coherence exhibited by many systems. Our approach is inspired by the remarkable
performance of flying insects, which use a few embedded strain-sensitive
neurons to achieve rapid and robust flight control despite large gust
disturbances. Specifically, we draw on nature to identify targeted
neural-inspired sensors on a flapping wing to detect body rotation. This task
is particularly challenging as the rotational twisting mode is three
orders-of-magnitude smaller than the flapping modes. We show that nonlinear
filtering in time, built to mimic strain-sensitive neurons, is essential to
detect rotation, whereas instantaneous measurements fail. Optimized sparse
sensor placement results in efficient classification with approximately ten
sensors, achieving the same accuracy and noise robustness as full measurements
consisting of hundreds of sensors. Sparse sensing with neural inspired encoding
establishes a new paradigm in hyper-efficient, embodied sensing of
spatiotemporal data and sheds light on principles of biological sensing for
agile flight control.Comment: 21 pages, 19 figure
The Quantification of Tooth Displacement
By using reference points from a single pixel marker placed at the center point of the cuspid teeth and the center point on each of the incisor teeth, a polynomial curve was generated as a native curve for each dental arch studied. The polynomial curve generated from actual tooth position in each arch provides the forensic odontologist with another reference point that is quantifiable. The study represents that individual characteristics, such as tooth displacement, can be quantified in a simple, reliable, and repeatable format
Evaluation of the East Bay Municipal Utility District's Pilot of WaterSmart Home Water Reports
This report presents the results of an independent evaluation of the East Bay Municipal Utility District's (EBMUD) year-long pilot project (Pilot) of WaterSmart Software's Home Water Reports (HWRs) service.The Pilot was intended to address three primary questions:First, would an SNB efficiency program like WaterSmart result in measurable reductionsin household water use?Second, would it increase rates of participation in other EBMUD conservation programs? Third, would it increase household knowledge and awareness of water consumption andways to use water more efficiently
Spontaneous Breaking of Gauge Groups to Discrete Symmetries
Many models of beyond Standard Model physics connect flavor symmetry with a
discrete group. Having this symmetry arise spontaneously from a gauge theory
maintains compatibility with quantum gravity and can be used to systematically
prevent anomalies. We minimize a number of Higgs potentials that break gauge
groups to discrete symmetries of interest, and examine their scalar mass
spectra.Comment: 45 page
Overview of Issues Surrounding Strangeness in the Nucleon
The calculation of the strangeness content of the nucleon and its
experimental verification is a fundamental step in establishing
non-perturbative QCD as the correct theory describing the structure of hadrons.
It holds a role in QCD analogous to the correct calculation of the Lamb shift
in QED. We review the latest developments in the vector and scalar matrix
elements of the strange quarks in the proton, where there has recently been
considerable progress.Comment: Invited presentation at the 10th Conference on the Intersection of
Nuclear and Particle Physics, San Diego, May 26-May 30, 200
A formalism for the construction of binary neutron stars with arbitrary circulation
Most numerical models of binary stars - in particular neutron stars in
compact binaries - assume the companions to be either corotational or
irrotational. Either one of these assumptions leads to a significant
simplification in the hydrodynamic equations of stationary equilibrium. In this
paper we develop a new formalism for the construction of binary stars with
circulation intermediate between corotational and irrotational. Generalizing
the equations for irrotational flow we cast the Euler equation, which is an
algebraic equation in the case of corotational or irrotational fluid flow, as
an elliptic equation for a new auxiliary quantity. We also suggest a
parameterized decomposition of the fluid flow that allows for a variation of
the stellar circulation.Comment: 8 pages, no figures; published version with erratu
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