5,139 research outputs found
Carrying Loss
Carrying Loss is a creative nonfiction piece I wrote based off of someone I know, a mother who discovers that she is pregnant with a baby that has Trisomy 18, a genetic disease with very low survival rates. This piece follows the internal struggle of the mother as she deals with this information, and decides to carry the baby to full term, despite the fact he has passed inside of her. It ends on the day of the baby\u27s birth as a still born
Suspension of objects in magnetic and electric fields
Device has improved suspension efficiency by simulating characteristics of diamagnetic materials. Pseudodiamagnetic device suspended magnet in magnetic field at rate of 232 Kg/W. Suspension in magnetic field can be produced in two ways: magnetic source can be stationary and pseudodiamagnetic device suspended or vice versa
Evaluating Outer Segment Length as A Surrogate Measure of Peak Foveal Cone Density
Adaptive optics (AO) imaging tools enable direct visualization of the cone photoreceptor mosaic, which facilitates quantitative measurements such as cone density. However, in many individuals, low image quality or excessive eye movements precludes making such measures. As foveal cone specialization is associated with both increased density and outer segment (OS) elongation, we sought to examine whether OS length could be used as a surrogate measure of foveal cone density. The retinas of 43 subjects (23 normal and 20 albinism; aged 6–67 years) were examined. Peak foveal cone density was measured using confocal adaptive optics scanning light ophthalmoscopy (AOSLO), and OS length was measured using optical coherence tomography (OCT) and longitudinal reflectivity profile-based approach. Peak cone density ranged from 29,200 to 214,000 cones/mm2(111,700 ± 46,300 cones/mm2); OS length ranged from 26.3 to 54.5 μm (40.5 ± 7.7 μm). Density was significantly correlated with OS length in albinism (p \u3c 0.0001), but not normals (p = 0.99). A cubic model of density as a function of OS length was created based on histology and optimized to fit the albinism data. The model includes triangular cone packing, a cylindrical OS with a fixed volume of 136.6 μm3, and a ratio of OS to inner segment width that increased linearly with increasing OS length (R2 = 0.72). Normal subjects showed no apparent relationship between cone density and OS length. In the absence of adequate AOSLO imagery, OS length may be used to estimate cone density in patients with albinism. Whether this relationship exists in other patient populations with foveal hypoplasia (e.g., premature birth, aniridia, isolated foveal hypoplasia) remains to be seen
The Interacting Gluon Model: a review
The Interacting Gluon Model (IGM) is a tool designed to study energy flow,
especially stopping and leading particle spectra, in high energy hadronic
collisions. In this model, valence quarks fly through and the gluon clouds of
the hadrons interact strongly both in the soft and in the semihard regime.
Developing this picture we arrive at a simple description of energy loss, given
in terms of few parameters, which accounts for a wide variety of experimental
data. This text is a survey of our main results and predictions.Comment: 22 pages, 21 figure
Violation of the Feynman scaling law as a manifestation of nonextensivity
We demonstrate that the apparently ad hoc parametrization of the particle
production spectra discussed in the literature and used in description of
cosmic ray data can be derived from the information theory approach to
multiparticle production processes. In particular, the violation of the Feynman
scaling law can be interpreted as a manifestation of nonextensivity of the
production processes.Comment: gz-compressed .tar file containing LaTeX file and 3 PS files with
figures (and 2 PS files with figure captions), 5 pages altogether (Nuovo
Cimento cimento.cls style file attached) Presented at Chacaltaya Meeting On
Cosmic Ray Physics, La Paz - Bolivia, 23-27 July 2000. To be published in
Nuovo Cimento (Proc. Suppl.
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