37 research outputs found
Nurses\u27 Alumnae Association Bulletin, June 1965
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Financial Report
Hospital and School of Nursing Report
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Jefferson Expansion Program
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An Extreme Precision Radial Velocity Pipeline: First Radial Velocities from EXPRES
The EXtreme PREcision Spectrograph (EXPRES) is an environmentally stabilized,
fiber-fed, , optical spectrograph. It was recently commissioned at
the 4.3-m Lowell Discovery Telescope (LDT) near Flagstaff, Arizona. The
spectrograph was designed with a target radial-velocity (RV) precision of
30. In addition to instrumental innovations, the EXPRES
pipeline, presented here, is the first for an on-sky, optical, fiber-fed
spectrograph to employ many novel techniques---including an "extended flat"
fiber used for wavelength-dependent quantum efficiency characterization of the
CCD, a flat-relative optimal extraction algorithm, chromatic barycentric
corrections, chromatic calibration offsets, and an ultra-precise laser
frequency comb for wavelength calibration. We describe the reduction,
calibration, and radial-velocity analysis pipeline used for EXPRES and present
an example of our current sub-meter-per-second RV measurement precision, which
reaches a formal, single-measurement error of 0.3 for an
observation with a per-pixel signal-to-noise ratio of 250. These velocities
yield an orbital solution on the known exoplanet host 51 Peg that matches
literature values with a residual RMS of 0.895
Excavation of an early 17th-century glassmaking site at Glasshouse, Shinrone, Co. Offaly, Ireland
An archaeological research excavation was conducted in the area immediately surrounding an upstanding glassmaking furnace near Shinrone, Co. Offaly, Ireland. It dates to the early to mid 17th century and was built and operated by French Huguenots, probably de Hennezells (de Hennezel/Henzeys/Hensie) who had settled in this region as part of the Crown plantation of Kingâs County (now Co. Offaly). This furnace, which employed wood rather than coal as a fuel, is a very rare survival, with no other upstanding examples known in Ireland, Britain or the Lorraine region of France where the form probably originated
Studies of iron (II) and iron (III) complexes with fac-N2O, cis-N2O2 and N2O3 donor ligands: models for the 2-His 1-carboxylate motif of non-heme iron monooxygenases
Enzymes in the oxygen-activating class of mononuclear non-heme iron oxygenases (MNOs) contain a highly conserved iron center facially ligated by two histidine nitrogen atoms and one carboxylate oxygen atom that leave one face of the metal center (three binding sites) open for coordination to cofactor, substrate, and/or dioxygen. A comparative family of [FeII/III(N2On)(L)4ân)]±x, n = 1â3, L = solvent or Clâ, model complexes, based on a ligand series that supports a facially ligated N,N,O core that is then modified to contain either one or two additional carboxylate chelate arms, has been structurally and spectroscopically characterized. EPR studies demonstrate that the high-spin d5 FeIIIg = 4.3 signal becomes more symmetrical as the number of carboxylate ligands decreases across the series Fe(N2O3), Fe(N2O2), and Fe(N2O1), reflecting an increase in the E/D strain of these complexes as the number of exchangeable/solvent coordination sites increases, paralleling the enhanced distribution of electronic structures that contribute to the spectral line shape. The observed systematic variations in the FeIIâFeIII oxidationâreduction potentials illustrate the fundamental influence of differential carboxylate ligation. The trend towards lower reduction potential for the iron center across the [FeIII(N2O1)Cl3]â, [FeIII(N2O2)Cl2]â and [FeIII(N2O3)Cl]â series is consistent with replacement of the chloride anions with the more strongly donating anionic O-donor carboxylate ligands that are expected to stabilize the oxidized ferric state. This electrochemical trend parallels the observed dioxygen sensitivity of the three ferrous complexes (FeII(N2O1) \u3c FeII(N2O2) \u3c FeII(N2O3)), which form ÎŒ-oxo bridged ferric species upon exposure to air or oxygen atom donor (OAD) molecules. The observed oxygen sensitivity is particularly interesting and discussed in the context of α-ketoglutarate-dependent MNO enzyme mechanisms
Vitality of Gorse-seed
The EXtreme PREcision Spectrograph (EXPRES) is a new Doppler spectrograph designed to reach a radial-velocity measurement precision sufficient to detect Earth-like exoplanets orbiting nearby, bright stars. We report on extensive laboratory testing and on-sky observations to quantitatively assess the instrumental radial-velocity measurement precision of EXPRES, with a focused discussion of individual terms in the instrument error budget. We find that EXPRES can reach a single-measurement instrument calibration precision better than 10 cm s-1, not including photon noise from stellar observations. We also report on the performance of the various environmental, mechanical, and optical subsystems of EXPRES, assessing any contributions to radial-velocity error. For atmospheric and telescope related effects, this includes the fast tip-tilt guiding system, atmospheric dispersion compensation, and the chromatic exposure meter. For instrument calibration, this includes the laser fRequency comb (LFC), flat-field light source, CCD detector, and effects in the optical fibers. Modal noise is mitigated to a negligible level via a chaotic fiber agitator, which is especially important for wavelength calibration with the LFC. Regarding detector effects, we empirically assess the impact on the radial-velocity precision due to pixel-position nonuniformities and charge transfer inefficiency (CTI). EXPRES has begun its science survey to discover exoplanets orbiting G-dwarf and K-dwarf stars, in addition to transit spectroscopy and measurements of the Rossiter-McLaughlin effect. © 2020. The American Astronomical Society. All rights reserved.Immediate accessThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]
Response to comment on âA global environmental crisis 42,000 years agoâ
Our paper about the impacts of the Laschamps Geomagnetic Excursion 42,000 years ago has provoked considerable scientific and public interest, particularly in the so-called Adams Event associated with the initial transition of the magnetic poles. Although we welcome the opportunity to discuss our new ideas, Hawksâ assertions of misrepresentation are especially disappointing given his limited examination of the material
Response to Comment on A global environmental crisis 42,000 years ago
[Figure: see text]