Now showing items 21-40 of 69421

    • On the Effect of Environment on Line Emission from the Circumgalactic Medium

      Zhang, Huanian; Zaritsky, Dennis; Behroozi, Peter; Werk, Jessica; Univ Arizona, Steward Observ (IOP PUBLISHING LTD, 2019-07-22)
      We measure differences in the emission-line flux from the circumgalactic medium (CGM) of galaxies in different environments. Such differences could be a critical clue in explaining a range of galaxy properties that depend on environment. Using large samples of stacked archival spectra from the Sloan Digital Sky Survey, we find that the H alpha + [N II] emission-line flux from the CGM within 50 kpc of similar to L* galaxies is lower both for galaxies that lie within a projected distance of similar to 500 kpc from a massive (M-* > 10(11) M-circle dot) galaxy and for galaxies in richer/denser environments. The environmental differences are statistically significant even after we control for galaxy mass and morphology. We interpret these observations as a direct signature of environmentally caused strangulation. We present a simple, heuristic model for the effect of a massive parent galaxy. In this model, the CGM cool gas fraction within 50 kpc is significantly decreased for galaxies that lie within 700 kpc of a massive galaxy, with about 80% of the cool gas removed even when the galaxy is at a distance of 500 kpc from its massive parent. However, we discuss alternative physical causes for the observed behavior and discuss ways forward in addressing open questions.
    • Spatially Resolved Interstellar Medium and Highly Excited Dense Molecular Gas in the Most Luminous Quasar at z = 6.327

      Wang, Feige; Wang, Ran; Fan, Xiaohui; Wu, Xue-Bing; Yang, Jinyi; Neri, Roberto; Yue, Minghao; Univ Arizona, Steward Observ (IOP PUBLISHING LTD, 2019-07-17)
      Among more than 200 quasars known at z greater than or similar to 6, only one object, J0100+2802 (z = 6.327), was found hosting a >10(10) M-circle dot supermassive black hole. In order to investigate the host galaxy properties of J0100+2802, we performed multi-band ALMA observations, aiming at mapping the dust continuum, [C II] and CO(6-5) emission lines with subkiloparsec scale resolution, as well as detecting high-J CO lines in CO(11-10), CO(10-9), and CO(7-6). The galaxy size is measured to be R-major = 3.6 +/- 0.2 kpc from the high-resolution continuum observations. No ordered motion on kiloparsec scales was found in either the [C II] or the CO(6-5) emission. The velocity dispersion is measured to be 161 +/- 7 km s(-1), which is about three times smaller than that estimated from the local M-sigma relation. In addition, we found that the CO emission is more concentrated (a factor of 1.8 +/- 0.4) than the [C II] emission. Together with CO(2-1) detected by the Very Large Array (VLA), we measured the CO spectral line energy distribution, which is best fit by a two-component model that includes a cool component at similar to 24 K with a density of n((H2)) = 10(4.5) cm(-3), and a warm component at similar to 224 K with a density of n((H2)) = 10(3.6) cm(-3). We also fit the dust continuum with a graybody model. This indicated that the continuum has either a high dust emissivity beta greater than or similar to 2 or a hot dust temperature T-dust greater than or similar to 60 K, or a combination of these two factors. The highly excited CO emission and hot dust temperature suggest that the powerful active galactic nucleus in J0100+2802 could contribute to the gas and dust heating, but future observations are needed to confirm this.
    • The Effect of 3D Transport-induced Disequilibrium Carbon Chemistry on the Atmospheric Structure, Phase Curves, and Emission Spectra of Hot Jupiter HD 189733b

      Steinrueck, Maria E.; Parmentier, Vivien; Showman, Adam P.; Lothringer, Joshua D.; Lupu, Roxana E.; Univ Arizona, Lunar & Planetary Lab (IOP PUBLISHING LTD, 2019-07-18)
      On hot Jupiter exoplanets, strong horizontal and vertical winds should homogenize the abundances of the important absorbers CH4 and CO much faster than chemical reactions restore chemical equilibrium. This effect, typically neglected in general circulation models (GCMs), has been suggested to explain discrepancies between observed infrared light curves and those predicted by GCMs. On the nightsides of several hot Jupiters, GCMs predict outgoing fluxes that are too large, especially in the Spitzer. 4.5 mu m band. We modified the SPARC/MITgcm to include disequilibrium abundances of CH4, CO, and H2O by assuming that the CH4/CO ratio is constant throughout the simulation domain. We ran simulations of hot Jupiter HD 189733b with eight CH4/CO ratios. In the more likely CO-dominated regime, we find temperature changes. >= 50-100 K compared to the simulation for equilibrium chemistry across large regions. This effect is large enough to affect predicted emission spectra and should thus be included in GCMs of hot Jupiters with equilibrium temperatures between 600 and 1300 K. We find that spectra in regions with strong methane absorption, including the Spitzer. 3.6 and 8 mu m bands, are strongly impacted by disequilibrium abundances. We expect chemical quenching to result in much larger nightside fluxes in the 3.6 mu m band, in stark contrast to observations. Meanwhile, we find almost no effect on predicted observations in the 4.5 mu m band, because the changes in opacity due to CO and H2O offset each other. We thus conclude that disequilibrium carbon chemistry cannot explain the observed low nightside fluxes in the 4.5 mu m band.
    • Challenges of customizing electrocardiography alarms in intensive care units: A mixed methods study

      Ruppel, Halley; Funk, Marjorie; Kennedy, Holly Powell; Bonafide, Christopher P; Wung, Shu-Fen; Whittemore, Robin; Univ Arizona, Coll Nursing (MOSBY-ELSEVIER, 2018)
      Background: Customizing monitor alarm settings to individual patients can reduce alarm fatigue in intensive care units (ICUs), but has not been widely studied. Objectives: To understand ICU nurses' approaches to customization of electrocardiographic (ECG) monitor alarms. Methods: A convergent mixed methods study was conducted in 3 ICUs in 1 hospital. Data on the type and frequency of ECG alarm customization were collected from patient monitors (n=298). Nurses' customization clinical reasoning was explored through semi-structured interviews (n=27). Results: Of the 298 patients, 58.7% had >= 1 alarm(s) customized. Heart rate limits, irregular heart rate, and atrial fibrillation were the most commonly customized alarms. Interviews revealed that customization practices varied widely and were influenced by factors including clinical expertise, lack of customization education, and negative experiences. Conclusion: Alarm customization is nuanced and requires adequate support to develop safe and effective practices. The challenges identified can inform development of strategies to improve alarm customization. (C) 2018 Elsevier Inc. All rights reserved.
    • ASASSN-15pz: Revealing Significant Photometric Diversity among 2009dc-like, Peculiar SNe Ia

      Chen, Ping; Dong, Subo; Katz, Boaz; Kochanek, C. S.; Kollmeier, Juna A.; Maguire, K.; Phillips, M. M.; Prieto, J. L.; Shappee, B. J.; Stritzinger, M. D.; et al. (IOP PUBLISHING LTD, 2019-07-22)
      We report comprehensive multi-wavelength observations of a peculiar Type Ia-like supernova ("SN Ia-pec") ASASSN-15pz. ASASSN-15pz is a spectroscopic "twin" of SN 2009dc, a so-called "Super-Chandrasekhar-mass" SN, throughout its evolution, but it has a peak luminosity M-B,(peak) = -19.69 +/- 0.12 mag that is approximate to 0.6 mag dimmer and comparable to the SN 1991T sub-class of SNe Ia at the luminous end of the normal width-luminosity relation. The synthesized Ni-56 mass of M-56Ni = 1.13 +/- 0.14 M-circle dot is also substantially less than that found for several 2009dc-like SNe. Previous well-studied 2009dc-like SNe have generally suffered from large and uncertain amounts of host-galaxy extinction, which is negligible for ASASSN-15pz. Based on the color of ASASSN-15pz, we estimate a host extinction for SN 2009dc of E(B - V)(host) = 0.12 mag and confirm its high luminosity (M-B,(peak) [2009dc] approximate to -20.3 mag). The 2009dc-like SN population, which represents similar to 1% of SNe Ia, exhibits a range of peak luminosities, and do not fit onto the tight width-luminosity relation. Their optical light curves also show significant diversity of late-time (greater than or similar to 50 days) decline rates. The nebular-phase spectra provide powerful diagnostics to identify the 2009dc-like events as a distinct class of SNe Ia. We suggest referring to these sources using the phenomenology-based "2009dc-like SN Ia-pec" instead of "Super-Chandrasekhar SN Ia," which is based on an uncertain theoretical interpretation.
    • The Atacama Cosmology Telescope: CO(J = 3 – 2) Mapping and Lens Modeling of an ACT-selected Dusty Star-forming Galaxy

      Rivera, Jesus; Baker, Andrew J.; Gallardo, Patricio A.; Gralla, Megan B.; Harris, Andrew I.; Huffenberger, Kevin M.; Hughes, John P.; Keeton, Charles R.; López-Caraballo, Carlos H.; Marriage, Tobias A.; et al. (IOP PUBLISHING LTD, 2019-07-11)
      We report Northern Extended Millimeter Array CO(J = 3 - 2) observations of the dusty star-forming galaxy ACT-S J020941+001557 at z = 2.5528, which was detected as an unresolved source in the Atacama Cosmology Telescope (ACT) equatorial survey. Our spatially resolved spectral line data support the derivation of a gravitational lens model from 37 independent velocity channel maps using a pixel-based algorithm, from which we infer a velocity-dependent magnification factor mu approximate to 7-22 with a luminosity-weighted mean <mu > approximate to 13. The resulting source-plane reconstruction is consistent with a rotating disk, although other scenarios cannot be ruled out by our data. After correction for lensing, we derive a line luminosity LCO(3-2)' = (5.53 +/- 0.69) x 10(10) K km s(-1) pc(2), a cold gas mass M-gas = (3.86 +/- 0.33) x 10(10) M-circle dot, a dynamical mass M-dyn sin(2) i = 3.9(-1.5)(+1.8) x 10(10) M-circle dot, and a gas mass fraction f(gas) csc(2) i = 1.0(-0.4)(+0.8). The line brightness temperature ratio of r(3,1) approximate to 1.6 relative to a Green Bank Telescope CO(J = 1 - 0) detection may be elevated by a combination of external heating of molecular clouds, differential lensing, and/or pointing errors.
    • The Evolution of the Interstellar Medium in Post-starburst Galaxies

      Li, Zhihui; French, K. Decker; Zabludoff, Ann I.; Ho, Luis C.; Univ Arizona, Steward Observ (IOP PUBLISHING LTD, 2019-07-16)
      We derive dust masses (M-dust) from the spectral energy distributions of 58 post-starburst galaxies (PSBs). There is an anticorrelation between specific dust mass (M-dust/M-star) and the time elapsed since the starburst ended, indicating that dust was either destroyed, expelled, or rendered undetectable over the similar to 1 Gyr after the burst. The M-dust/M-star depletion timescale, 205(-37)(+58) Myr, is consistent with that of the CO-traced M-H2/M-star, suggesting that dust and gas are altered via the same process. Extrapolating these trends leads to the M-dust/M-star and M-H2/M-star values of early-type galaxies (ETGs) within 1-2 Gyr, a timescale consistent with the evolution of other PSB properties into ETGs. Comparing M-dust and M-H2 for PSBs yields a calibration, log M-H2 = 0.45 log M-dust + 6.02, that allows us to place 33 PSBs on the Kennicutt-Schmidt (KS) plane, Sigma SFR-Sigma M-H2. Over the first similar to 200-300 Myr, the PSBs evolve down and off of the KS relation, as their star formation rate (SFR) decreases more rapidly than M-H2. Afterwards, M-H2 continues to decline whereas the SFR levels off. These trends suggest that the star formation efficiency bottoms out at 10-11 yr(-1) and will rise to ETG levels within 0.5-1.1 Gyr afterwards. The SFR decline after the burst is likely due to the absence of gas denser than the CO-traced H-2. The mechanism of the M-dust/M-star and M-H2/M-star decline, whose timescale suggests active galactic nucleus/low-ionization nuclear emission-line region feedback, may also be preventing the large CO-traced molecular gas reservoirs from collapsing and forming denser star-forming clouds.
    • Critical Care Nurses' Cognitive Ergonomics Related to Medical Device Alarms

      Wung, Shu-Fen; Schatz, Marilyn Rose; Univ Arizona, Coll Nursing, Biobehav Hlth Sci Div (W B SAUNDERS CO-ELSEVIER INC, 2018-06-01)
      This study uniquely gained insight into the intricacy of intensive care nurses' decision-making process when responding to and managing device alarms. Difficulty in responding to alarms included low staffing, multiple job responsibilities, and competing priority tasks. Novice nurses are more tolerant of alarms sounding owing to a lower threshold of comfort with resetting or silencing alarms; more experienced nurses are more comfortable resetting alarm limits to the patient's baseline. Understanding the decision-making process used by nurses can guide the development of policies and learning experiences that are crucial clinical support for alarm management.
    • The Dust and Molecular Gas in the Brightest Cluster Galaxy in MACS 1931.8-2635

      Fogarty, Kevin; Postman, Marc; Li, Yuan; Dannerbauer, Helmut; Liu, Hauyu Baobab; Donahue, Megan; Ziegler, Bodo; Koekemoer, Anton; Frye, Brenda; Univ Arizona, Dept Astron & Steward Obs (IOP PUBLISHING LTD, 2019-07-10)
      We present new Atacama Large Millimeter Array observations of the molecular gas and far-infrared continuum around the brightest cluster galaxy (BCG) in the cool-core cluster MACS 1931.8-2635. Our observations reveal (1.9 +/- 0.3) x 10(10) M-circle dot of molecular gas, on par with the largest known reservoirs of cold gas in a cluster core. We detect CO(1-0), CO(3-2), and CO(4-3) emission from both diffuse and compact molecular gas components that extend from the BCG center out to similar to 30 kpc to the northwest, tracing the UV knots and Ha filaments observed by the Hubble Space Telescope. Due to the lack of morphological symmetry, we hypothesize that the similar to 300 km s(-1) velocity of the CO in the tail is not due to concurrent uplift by active galactic nucleus (AGN) jets; rather, we may be observing the aftermath of a recent AGN outburst. The CO spectral line energy distribution suggests that molecular gas excitation is influenced by processes related to both star formation and recent AGN feedback. Continuum emission in Bands 6 and 7 arises from dust and is spatially coincident with young stars and nebular emission observed in the UV and optical. We constrain the temperature of several dust clumps to be less than or similar to 10 K, which is too cold to be directly interacting with the surrounding similar to 4.8 keV intracluster medium (ICM). The cold dust population extends beyond the observed CO emission and must either be protected from interacting with the ICM or be surrounded by local volumes of ICM that are several keV colder than observed by Chandra.
    • Comparing Long-duration Gamma-Ray Flares and High-energy Solar Energetic Particles

      de Nolfo, G. A.; Bruno, A.; Ryan, J. M.; Dalla, S.; Giacalone, J.; Richardson, I. G.; Christian, E. R.; Stochaj, S. J.; Bazilevskaya, G. A.; Boezio, M.; et al. (IOP PUBLISHING LTD, 2019-07-10)
      Little is known about the origin of the high-energy and sustained emission from solar long-duration gamma-ray flares (LDGRFs) identified with the Compton Gamma Ray Observatory, the Solar Maximum Mission, and now Fermi. Though the Fermi Large Area Telescope (LAT) has identified dozens of flares with LDGRF signatures, the nature of this phenomenon has been a challenge to explain due to both extreme energies and long durations. The highest-energy emission has generally been attributed to pion production from the interaction of greater than or similar to 300 MeV protons with the ambient matter. The extended duration suggests that particle acceleration occurs over large volumes extending high in the corona, either from stochastic acceleration within large coronal loops or from back precipitation from coronal mass ejection-driven shocks. It is possible to test these models by making a direct comparison between the properties of the accelerated ion population producing the gamma-ray emission derived from the Fermi/LAT observations and the characteristics of solar energetic particles (SEPs) measured by the Payload for Matter-Antimatter Exploration and Light Nuclei Astrophysics spacecraft in the energy range corresponding to the pion-related emission detected with Fermi. For 14 of these events, we compare the two populations-SEPs in space and the interacting particles at the Sun-and discuss the implications in terms of potential sources. Our analysis shows that the two proton numbers are poorly correlated, with their ratio spanning more than 5 orders of magnitude, suggesting that the back precipitation of shock-acceleration particles is unlikely to be the source of the LDGRF emission.
    • "Swimming in Poison": Reimagining Endocrine Disruption through China's Environmental Hormones

      Lamoreaux, Janelle; Univ Arizona, Anthropol (UNIV CALIFORNIA BERKELEY, INST EAST ASIAN STUDIES, 2019-03)
      This article analyzes media responses to a 2010 Greenpeace China report titled Swimming in Poison. Among other alarming data, the report states that fish from collection points along the Yangtze River showed elevated levels of harmful "environmental hormones" (huanjing jisu), also referred to as endocrine-disrupting chemicals (EDCs). Scholars have critiqued EDC science and activism for its heteronormative pathologizing of intersexuality, nonreproductive sexual activity, and impaired fertility, drawing attention to the "sex panic" at work in EDC discourse. This article shows that such sex panic is neither necessary nor universal in anxieties surrounding EDCs. Unlike media responses to EDC events in Europe and North America, Chinese news articles that followed the report did not focus on anxieties surrounding sexual transgression. Instead, media reactions focused on food safety, industrial capitalism, and the ecological scope of pollution. Based on this analysis, the author argues that the disruptive quality and analytic potential of China's environmental hormones has less to do with a defense of sexual purity or bodily integrity, and more to do with acknowledging the depths to which human and nonhuman bodies in today's China are suffused with the sometimes toxic social, economic, political, and chemical environments in which people eat, grow, and live.
    • Search for the Production of a Long-Lived Neutral Particle Decaying within the ATLAS Hadronic Calorimeter in Association with a Z Boson from pp Collisions at root s=13 TeV

      Berlendis, S.; Cheu, E.; Delitzsch, C. M.; Johns, K. A.; Jones, S.; Lampl, W.; LeBlanc, M.; Leone, R.; Loch, P.; Nayyar, R.; et al. (AMER PHYSICAL SOC, 2019-04-15)
      This Letter presents a search for the production of a long-lived neutral particle (Z(d)) decaying within the ATLAS hadronic calorimeter, in association with a standard model (SM) Z boson produced via an intermediate scalar boson, where Z -> l(+) l(-) (l = e, mu). The data used were collected by the ATLAS detector during 2015 and 2016 pp collisions with a center-of-mass energy of root s = 13 TeV at the Large Hadron Collider and correspond to an integrated luminosity of 36.1 +/- 0.8 fb(-1). No significant excess of events is observed above the expected background. Limits on the production cross section of the scalar boson times its decay branching fraction into the long-lived neutral particle are derived as a function of the mass of the intermediate scalar boson, the mass of the long-lived neutral particle, and its c tau from a few centimeters to one hundred meters. In the case that the intermediate scalar boson is the SM Higgs boson, its decay branching fraction to a long-lived neutral particle with a c tau approximately between 0.1 and 7 m is excluded with a 95% confidence level up to 10% for m(zd) between 5 and 15 GeV.
    • Cross-section measurements of the Higgs boson decaying into a pair of tau-leptons in proton-proton collisions at root s=13 TeV with the ATLAS detector

      Berlendis, S.; Cheu, E.; Delitzsch, C. M.; Johns, K. A.; Jones, S.; Lampl, W.; LeBlanc, M.; Leone, R.; Loch, P.; Nayyar, R.; et al. (AMER PHYSICAL SOC, 2019-04-10)
      A measurement of production cross sections of the Higgs boson in proton-proton collisions is presented in the H -> tau tau decay channel. The analysis is performed using 36.1 fb(-1) of data recorded by the ATLAS experiment at the Large Hadron Collider at a center-of-mass energy of root s = 13 TeV. All combinations of leptonic (tau -> l v (v) over bar with l = e, mu) and hadronic (tau -> hadrons v) tau decays arc considered. The H -> tau tau signal over the expected background from other Standard Model processes is established with an observed (expected) significance of 4.4 (4.1) standard deviations. Combined with results obtained using data taken at 7 and 8 TeV center-of-mass energies, the observed (expected) significance amounts to 6.4 (5.4) standard deviations and constitutes an observation of H -> tau tau decays. Using the data taken at root s = 13 TeV, the total cross section in the H -> tau tau decay channel is measured to be 3.77(-0.59)(+0.60)(stat)(-0.74)(+0.87) (syst) pb, for a Higgs boson of mass 125 GeV assuming the relative contributions of its production modes as predicted by the Standard Model. Total cross sections in the H -> tau tau decay channel are determined separately for vector-boson-fusion production and gluon-gluon-fusion production to be sigma(VBF)(H -> tau tau) = 0.28 +/- 0.09 (stat)(-0.09)(+0.11) (syst) pb and sigma(ggF)(H -> tau tau) = 3.1 +/- 1.0 (stat)(-1.3)(+1.6) (syst) pb, respectively. Similarly, results of a fit are reported in the framework of simplified template cross sections. All measurements are in agreement with Standard Model expectations.
    • Measurements of inclusive and differential fiducial cross-sections of t(t)over-bar production with additional heavy-flavour jets in proton-proton collisions at root s=13 TeV with the ATLAS detector

      Berlendis, S.; Cheu, E.; Delitzsch, C. M.; Johns, K. A.; Jones, S.; Lampl, W.; LeBlanc, M.; Leone, R.; Loch, P.; Nayyar, R.; et al. (SPRINGER, 2019-04-04)
      This paper presents measurements of tt (t) over bar production in association with additional b-jets in pp collisions at the LHC at a centre-of-mass energy of 13 TeV. The data were recorded with the ATLAS detector and correspond to an integrated luminosity of 36.1 fb(-1). Fiducial cross-section measurements are performed in the dilepton and lepton-plus-jets tt (t) over bar decay channels. Results are presented at particle level in the form of inclusive cross-sections of tt final states with three and four b-jets as well as differential cross-sections as a function of global event properties and properties of b-jet pairs. The measured inclusive fiducial cross-sections generally exceed the t (t) over barb (b) over bar predictions from various next-to-leading-order matrix element calculations matched to a parton shower but are compatible within the total uncertainties. The experimental uncertainties are smaller than the uncertainties in the predictions. Comparisons of state-of-the-art theoretical predictions with the differential measurements are shown and good agreement with data is found for most of them.
    • Measurement of the four-lepton invariant mass spectrum in 13 TeV proton-proton collisions with the ATLAS detector

      Berlendis, S.; Cheu, E.; Delitzsch, C. M.; Johns, K. A.; Jones, S.; Lampl, W.; LeBlanc, M.; Leone, R.; Loch, P.; Nayyar, R.; et al. (SPRINGER, 2019-04-05)
      A measurement of the four-lepton invariant mass spectrum is made with the ATLAS detector, using an integrated luminosity of 36.1 fb(-1) of proton-proton collisions at root s = 13 TeV delivered by the Large Hadron Collider. The differential cross-section is measured for events containing two same-flavour opposite-sign lepton pairs. It exhibits a rich structure, with different mass regions dominated in the Standard Model by single Z boson production, Higgs boson production, and Z boson pair production, and non-negligible interference effects at high invariant masses. The measurement is compared with state-of-the-art Standard Model calculations, which are found to be consistent with the data. These calculations are used to interpret the data in terms of gg -> ZZ -> 4l and Z -> 4l subprocesses, and to place constraints on a possible contribution from physics beyond the Standard Model.
    • Search for Higgs boson pair production in the b(b)over-barWW* decay mode at root s=13 TeV with the ATLAS detector

      Berlendis, S.; Cheu, E.; Delitzsch, C. M.; Johns, K. A.; Jones, S.; Lampl, W.; LeBlanc, M.; Leone, R.; Loch, P.; Nayyar, R.; et al. (SPRINGER, 2019-04-12)
      A search for Higgs boson pair production in the bbWW decay mode is performed in the bb`qq fi nal state using 36.1 fb of proton-proton collision data at a centreof- mass energy of 13TeV recorded with the ATLAS detector at the Large Hadron Collider. No evidence of events beyond the background expectation is found. Upper limits on the non-resonant pp ! HH production cross section of 10 pb and on the resonant production cross section as a function of the HH invariant mass are obtained. Resonant production limits are set for scalar and spin-2 graviton hypotheses in the mass range 500 to 3000 GeV.
    • Right atrial myxoma presenting as a pulmonary embolism in a 32-year-old female

      Pandey, Amitabh C; Carey, John J; Thompson, Jess L; Univ Arizona, Dept Med; Univ Arizona, Dept Surg, Div Cardiothorac Surg (SAGE PUBLICATIONS LTD, 2019-04-16)
      Primary cardiac tumors are typically benign, with myxomas being most common. We present a 32-year-old female with a chief complaint of dyspnea and a constant non-radiating chest pressure along the left sternal border. She was found to have a pulmonary embolism that was ultimately caused by embolization of a right atrial myxoma with remnants of a large, highly mobile mass attached to the right inter-atrial septum prolapsing through the tricuspid valve. The patient underwent a median sternotomy, right atrial mass resection, pulmonary embolectomy, and inter-atrial septum reconstruction using the patient's pericardium. The importance of finding the etiology of initial diagnoses is stressed with long-term outcomes for patients.
    • Precision Higgs physics at the CEPC

      Su, Shufang; Univ Arizona, Dept Phys (IOP PUBLISHING LTD, 2019-04-04)
      The discovery of the Higgs boson with its mass around 125 GeV by the ATLAS and CMS Collaborations marked the beginning of a new era in high energy physics. The Higgs boson will be the subject of extensive studies of the ongoing LHC program. At the same time, lepton collider based Higgs factories have been proposed as a possible next step beyond the LHC, with its main goal to precisely measure the properties of the Higgs boson and probe potential new physics associated with the Higgs boson. The Circular Electron Positron Collider (CEPC) is one of such proposed Higgs factories. The CEPC is an e(+)e(-) circular collider proposed by and to be hosted in China Located in a tunnel of approximately 100 km in circumference, it will operate at a center-of-mass energy of 240 GeV as the Higgs factory. In this paper, we present the first estimates on the precision of the Higgs boson property measurements achievable at the CEPC and discuss implications of these measurements.
    • Experimental Investigation on Failure Modes and Mechanical Properties of Rock-Like Specimens with a Grout-Infilled Flaw under Triaxial Compression

      Le, Huilin; Sun, Shaorui; Zhu, Feng; Fan, Haotian; Univ Arizona, Rock Mass Modeling & Computat Rock Mech Labs (HINDAWI LTD, 2019)
      Flaws existing in rock mass are one of the main factors resulting in the instability of rock mass. Epoxy resin is often used to reinforce fractured rock mass. However, few researches focused on mechanical properties of the specimens with a resin-infilled flaw under triaxial compression. Therefore, in this research, epoxy resin was selected as the grouting material, and triaxial compression tests were conducted on the rock-like specimens with a grout-infilled flaw having different geometries. This study draws some new conclusions. The high confining pressure suppresses the generation of tensile cracks, and the failure mode changes from tensile-shear failure to shear failure as the confining pressure increases. Grouting with epoxy resin leads to the improvement of peak strengths of the specimens under triaxial compression. The reinforcement effect of epoxy resin is better for the specimens having a large flaw length and those under a relatively low confining pressure. Grouting with epoxy resin reduces the internal friction angle of the samples but improves their cohesion. This research may provide some useful insights for understanding the mechanical behaviors of grouted rock masses.
    • Effect of Real-Time Surveys on Patient Satisfaction Scores in the Emergency Department

      Sobel, Julia; Bates, Jessica; Ng, Vivienne; Berkman, Matthew; Nuño, Tomas; Denninghoff, Kurt; Stoneking, Lisa; Univ Arizona, Coll Med; Univ Arizona, Dept Emergency Med (HINDAWI LTD, 2019)
      Background. Patient satisfaction surveys have become increasingly important as their results help to determine Centers for Medicare and Medicaid Services (CMS) reimbursement. However, these questionnaires have known sources of bias (self-selection, responder, attribution, and nonresponse). Objective. We developed a real-time (RT) survey delivered in the hospital ED to evaluate the effect of implementing RT patient satisfaction surveys on physician behavior and hypothesized that the timing of patient satisfaction survey delivery would significantly impact the results. Method. Data from real-time patient satisfaction surveys were collected in phases from 12/2015 to 5/2017. Hospital-sponsored (HS) surveys were administered after discharge from 12/2015 to 12/2016. Results. For RT surveys, resident physicians were significantly more likely to write their names on the whiteboard (p = 0.02) and sit down (p = 0.01) with patients. Behavior modifications by attending physicians were not significant. Patient satisfaction measures did not improve significantly between periods for RT or HS surveys; however, RT survey responders were significantly more likely to recommend the ED to others. Conclusion. The timing of survey administration did significantly alter resident physician's behavior; however, it had no effect on patient satisfaction scores. RT responders were significantly more likely to recommend the emergency department to others.