67 research outputs found
Reflections on the journey: six short stories
One of the goals of the 2011 International Year of Chemistry is to celebrate the contributions of women to science. A question that has been frequently asked in this regard is... Why is it necessary to highlight women in the "age of equality"? The reasons are varied but the facts are that many women scientists worked in obscurity throughout the 19th and even well into the 20th century, sometimes publishing anonymously to be heard. This celebration of Women in Science is one way to recognize both the resiliency and passion of these women. As part of this celebration, Chemistry Central Journal's Thematic Series of "Women in Chemistry" includes this article describing the path several women took as they pursued chemistry careers spanning the latter part of the 20th century and into the early 21st century. Sharon Haynie, Nancy Jones, Cheryl Martin, Paula Olsiewski, Mary Roberts and Amber Hinkle each have unique story of their personal journey from childhood to adulthood. As you read these stories, listen generously, and feel free to share your own stories, comments and thoughts
The Mission Accessible Near-Earth Objects Survey: Four years of photometry
Over 4.5 years, the Mission Accessible Near-Earth Object Survey (MANOS)
assembled 228 Near-Earth Object (NEO) lightcurves. We report rotational
lightcurves for 82 NEOs, constraints on amplitudes and periods for 21 NEOs,
lightcurves with no detected variability within the image signal to noise and
length of our observing block for 30 NEOs, and 10 tumblers. We uncovered 2
ultra-rapid rotators with periods below 20s; 2016MA with a potential rotational
periodicity of 18.4s, and 2017QG rotating in 11.9s, and estimate the
fraction of fast/ultra-rapid rotators undetected in our project plus the
percentage of NEOs with a moderate/long periodicity undetectable during our
typical observing blocks. We summarize the findings of a simple model of
synthetic NEOs to infer the object morphologies distribution using the measured
distribution of lightcurve amplitudes. This model suggests a uniform
distribution of axis ratio can reproduce the observed sample. This suggests
that the quantity of spherical NEOs (e.g., Bennu) is almost equivalent to the
quantity of highly elongated objects (e.g., Itokawa), a result that can be
directly tested thanks to shape models from Doppler delay radar imaging
analysis. Finally, we fully characterized 2 NEOs as appropriate targets for a
potential robotic/human mission: 2013YS and 2014FA due to their
moderate spin periods and low .Comment: Accepted for Publication, The Astrophysical Journal Supplement Serie
Near-infrared Spectral Characterization of Solar-type Stars in the Northern Hemisphere
Although solar-analog stars have been studied extensively over the past few
decades, most of these studies have focused on visible wavelengths, especially
those identifying solar-analog stars to be used as calibration tools for
observations. As a result, there is a dearth of well-characterized solar
analogs for observations in the near-infrared, a wavelength range important for
studying solar system objects. We present 184 stars selected based on
solar-like spectral type and V-J and V-K colors whose spectra we have observed
in the 0.8-4.2 micron range for calibrating our asteroid observations. Each
star has been classified into one of three ranks based on spectral resemblance
to vetted solar analogs. Of our set of 184 stars, we report 145 as reliable
solar-analog stars, 21 as solar analogs usable after spectral corrections with
low-order polynomial fitting, and 18 as unsuitable for use as calibration
standards owing to spectral shape, variability, or features at low to medium
resolution. We conclude that all but 5 of our candidates are reliable solar
analogs in the longer wavelength range from 2.5 to 4.2 microns. The average
colors of the stars classified as reliable or usable solar analogs are
V-J=1.148, V-H=1.418, and V-K=1.491, with the entire set being distributed
fairly uniformly in R.A. across the sky between -27 and +67 degrees in decl.Comment: 19 pages, 8 figures, 2 table
STUDIES IN DIABETES MELLITUS. II. THE OCCURRENCE OF A DIURESIS IN DIABETIC PERSONS EXPOSED TO STRESSFUL LIFE SITUATIONS, WITH EXPERIMENTAL OBSERVATIONS ON ITS RELATION TO THE CONCENTRATION OF GLUCOSE IN BLOOD AND URINE 1
THE OCCURRENCE OF DIURESIS IN HUMANS IN STRESSFUL SITUATIONS AND ITS POSSIBLE RELATION TO THE DIURESIS OF EARLY STARVATION
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