376 research outputs found
A determination of concepts of healthful living which are of functional value in contributing to the general education of elementary school pupils
Thesis (Ed.D.)--Boston University. This item was digitized by the Internet Archive
Toward a better understanding of the comparatively high prostate cancer incidence rates in Utah
BACKGROUND: This study assesses whether comparatively high prostate cancer incidence rates among white men in Utah represent higher rates among members of the Church of Jesus Christ of Latter-day Saints (LDS or Mormons), who comprise about 70% of the state's male population, and considers the potential influence screening has on these rates. METHODS: Analyses are based on 14,693 histologically confirmed invasive prostate cancer cases among men aged 50 years and older identified through the Utah Cancer Registry between 1985 and 1999. Cancer records were linked to LDS Church membership records to determine LDS status. Poisson regression was used to derive rate ratios of LDS to nonLDS prostate cancer incidence, adjusted for age, disease stage, calendar time, and incidental detection. RESULTS: LDS men had a 31% (95% confidence interval, 26% â 36%) higher incidence rate of prostate cancer than nonLDS men during the study period. Rates were consistently higher among LDS men over time (118% in 1985â88, 20% in 1989â92, 15% in 1993â1996, and 13% in 1997â99); age (13% in ages 50â59, 48% in ages 60â69, 28% in ages 70â79, and 16% in ages 80 and older); and stage (36% in local/regional and 17% in unstaged). An age- and stage-shift was observed for both LDS and nonLDS men, although more pronounced among LDS men. CONCLUSIONS: Comparatively high prostate cancer incidence rates among LDS men in Utah are explained, at least in part, by more aggressive screening among these men
A Medium-Resolution Near-Infrared Spectral Library of Late Type Stars: I
We present an empirical infrared spectral library of medium resolution
(R~2000-3000) H (1.6 micron) and K (2.2 micron) band spectra of 218 red stars,
spanning a range of [Fe/H] from ~-2.2 to ~+0.3. The sample includes Galactic
disk stars, bulge stars from Baade's window, and red giants from Galactic
globular clusters. We report the values of 19 indices covering 12 spectral
features measured from the spectra in the library. Finally, we derive
calibrations to estimate the effective temperature, and diagnostic
relationships to determine the luminosity classes of individual stars from
near-infrared spectra.
This paper is part of a larger effort aimed at building a near-IR spectral
library to be incorporated in population synthesis models, as well as, at
testing synthetic stellar spectra.Comment: 34 pages, 12 figures; accepted for publication at ApJS; the spectra
are available from the authors upon reques
Comparison of two methods based on cross-sectional data for correcting corpus uterine cancer incidence and probabilities
BACKGROUND: Two methods are presented for obtaining hysterectomy prevalence corrected estimates of invasive cancer incidence rates and probabilities of the corpus uterine. METHODS: The first method involves cross-sectional hysterectomy data from the Utah Hospital Discharge Data Base and mortality data applied to life-table methods. The second involves hysterectomy prevalence estimates obtained directly from the Utah Behavior Risk Factor Surveillance System (BRFSS) survey. RESULTS: Hysterectomy prevalence estimates based on the first method are lower than those obtained from the second method through age 74, but higher in the remaining ages. Correction for hysterectomy prevalence is greatest among women ages 75â79. In this age group, the uncorrected rate is 125 (per 100,000) and the corrected rate based on the life-table method is 223 using 1995â97 data, 243 using 1992â94 data, and 228 from the survey method. The uncorrected lifetime probability of developing corpus uterine cancer is 2.6%; the corrected probability from the life-table method using 1995â97 data is 4.2%, using 1992â94 data is 4.5%; and based on prevalence data from the survey method is 4.6%. CONCLUSIONS: Both methods provide reasonable hysterectomy prevalence estimates for correcting corpus uterine cancer rates and probabilities. Because of declining trends in hysterectomy in recent decades, corrected estimates from the life-table method are less pronounced than those based on the survey method. These methods may be useful for obtaining corrected uterine cancer rates and probabilities in areas of the world that do not have sufficient years of hysterectomy data to directly compute prevalence
The Continuing Slow Decline of AG Pegasi
We analyze optical and ultraviolet observations of the symbiotic binary AG
Pegasi acquired during 1992-97. The bolometric luminosity of the hot component
declined by a factor of 2-3 from 1980-1985 to 1997. Since 1992, the effective
temperature of the hot component may have declined by 10%-20%, but this decline
is comparable to the measurement errors. Optical observations of H-beta and He
I emission show a clear illumination effect, where high energy photons from the
hot component ionize the outer atmosphere of the red giant. Simple illumination
models generally account for the magnitude of the optical and ultraviolet
emission line fluxes. High ionization emission lines - [Ne V], [Mg V], and [Fe
VII] - suggest mechanical heating in the outer portions of the photoionized red
giant wind. This emission probably originates in a low density region
30-300 AU from the central binary.Comment: 17 pages, 7 pages, 5 tables; to be published in the Astronomical
Journal, July 200
Demonstration of integrated microscale optics in surface-electrode ion traps
In ion trap quantum information processing, efficient fluorescence collection
is critical for fast, high-fidelity qubit detection and ion-photon
entanglement. The expected size of future many-ion processors require scalable
light collection systems. We report on the development and testing of a
microfabricated surface-electrode ion trap with an integrated high numerical
aperture (NA) micromirror for fluorescence collection. When coupled to a low NA
lens, the optical system is inherently scalable to large arrays of mirrors in a
single device. We demonstrate stable trapping and transport of 40Ca+ ions over
a 0.63 NA micromirror and observe a factor of 1.9 enhancement in photon
collection compared to the planar region of the trap.Comment: 15 pages, 8 figure
Cardiac angiography without cine film: Erecting a âTower of Babelâ in the cardiac catheterization laboratory
Bostonia. Volume 9
Founded in 1900, Bostonia magazine is Boston University's main alumni publication, which covers alumni and student life, as well as university activities, events, and programs
Spectroscopic observations of the candidate sgB[e]/X-ray binary CI Cam
We present a compilation of spectroscopic observations of the sgB[e] star CI
Cam. This includes data from before, during, and after its 1998 outburst. The
object shows a rich emission line spectrum originating from circumstellar
material, rendering it difficult to determine the nature of either star
involved or the cause of the outburst. We collate pre-outburst data to
determine the state of the system before this occurred and provide a baseline
for comparison with later data. During the outburst all lines become stronger,
and hydrogen and helium lines become significantly broader and asymmetric.
After the outburst, spectral changes persist for at least three years, with
FeII and [NII] lines still a factor of ~2 above the pre-outburst level and HeI,
HeII, and NII lines suppressed by a factor of 2-10. We find that the spectral
properties of CI Cam are similar to other sgB[e] stars and therefore suggest
that the geometry of the circumstellar material is similar to that proposed for
the other objects: a two component outflow, with a fast, hot, rarefied polar
wind indistinguishable from that of a normal supergiant and a dense, cooler
equatorial outflow with a much lower velocity. We suggest that CI Cam is among
the hotter members of the class and is viewed nearly pole-on. The nature of the
compact object and the mechanism for the outburst remain uncertain, although it
is likely that the compact object is a black hole or neutron star, and that the
outburst was precipitated by its passage through the equatorial material. We
suggest that this prompted a burst of supercritical accretion resulting in
ejection of much of the material, which was later seen as an expanding radio
remnant. [Abbreviated]Comment: 25 pages including figures. Accepted for publication in A&
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