University of Saint Mary

About: University of Saint Mary is a education organization based out in Leavenworth, Kansas, United States. It is known for research contribution in the topics: Population & Galaxy. The organization has 2276 authors who have published 2399 publications receiving 58990 citations. The organization is also known as: University of St. Mary & University of St Mary.

Fluid and Halide Melt Inclusions of Magmatic Origin in the Ultramafic and Lower Banded Series, Stillwater Complex, Montana, USA

Abstract: Fluid andmelt inclusions trapped in igneous rocks below the platinumgroup element (PGE)-rich J-M reef in the Stillwater Complex, Montana provide a physiochemical record of a continuum of high P^T magmatic^hydrothermal and low P^T metamorphic events. Magmatic^hydrothermal volatiles ranged from NaCl-dominated halide melts (482 wt%NaClequiv) to more complexNa^Ca^K^Fe^ Mn^Ba^Si^Al^Cl brines (28^79 wt % NaClequiv) that were trapped simultaneously with a moderate density carbonic fluid (CO2 CH4). Early primary inclusions containing immiscible brine and carbonic fluid were trapped in the granophyric albite^quartz core of a zoned pegmatite body in the Gabbronorite I unit at T of 700^7158C, and P between 4 3 and 5 6 kbar.The pegmatitic body crystallized from a fluid-saturated residual silicate liquid that was channeled through the cooling igneous stratigraphy. Approximately 500 m stratigraphically below the pegmatite, in the Ultramafic Series, early halide melt inclusions representing samples of formerly molten NaClwere trapped in unaltered primary olivine overa minimum range in temperature of 660^8008C. In the same olivine that hosts the halide melt inclusions, secondary brine inclusions with a composition similar to brines in the pegmatite were trapped over a minimum temperature range of 480^6408C. As hydrothermal activity continued during post-solidus cooling of the intrusion, quartz precipitation in the vuggycore of the pegmatitebody trappedpost-magmatic, immiscible brine and carbonic fluid inclusion assemblages that record a progressive decrease in fluid salinity, T and confining P from lithostatic to near-hydrostatic conditions. Late secondary inclusions containing regional metamorphic fluids were trapped in quartz in the pegmatite after cooling to zeolite-facies conditions.The late metamorphic fluids were low to moderate salinity, CaCl2^MgCl2^H2O solutions. Hydrous salt melts, magmatic brines, and non aqueous (carbonic) fluids may have coexisted and interacted throughout much of the late crystallization and post-magmatic history of the Stillwater Complex. Hence, the potential for interaction between exsolved magmatic volatiles and grain boundary-hosted sulfide minerals below the J-M reef at near-solidus temperatures, and the post-magmatic modification of theJ-M reef PGE ore compositions by hydrothermal fluids are strongly indicated.

The Canada–France Imaging Survey: First Results from the u-Band Component

Abstract: The Canada-France Imaging Survey (CFIS) will map the northern high Galactic latitude sky in the uband ("CFIS-u", 10,000 deg 2) and in the r-band ("CFIS-r", 5,000 deg 2), enabling a host of stand-alone science investigations, and providing some of the ground-based data necessary for photometric redshift determination for the Euclid mission. In this first contribution we present the u-band component of the survey, describe the observational strategy, and discuss some first highlight results, based on approximately one third of the final area. We show that the Galactic anticenter structure is distributed continuously along the line of sight, out to beyond 20 kpc, and possesses a metallicity distribution that is essentially identical to that of the outer disk sampled by APOGEE. This suggests that it is probably a buckled disk of old metal-rich stars, rather than a stream or a flare. We also discuss the future potential for CFIS-u in discovering star-forming dwarf galaxies around the Local Group, the characterization of the white dwarf and blue straggler population of the Milky Way, as well as its sensitivity to low-surface brightness structures in external galaxies.

Warning signs of imminent respiratory failure in neurological patients.

Abstract: Critically ill neurological patients often need ventilatory assistance. After acute central nervous system insults, the inability to protect the airway and impaired central respiratory drive can only be managed with endotracheal intubation and mechanical ventilation. In patients with acute or worsening neuromuscular disorders, diaphragmatic failure and pronounced bulbar weakness may necessitate intubation to assist in the work of breathing or to prevent upper airway obstruction. Simple respiratory function tests performed at the bedside should be used to monitor patients with progressive neuromuscular respiratory insufficiency. Noninvasive positive pressure ventilation plays an important role in the management of respiratory failure in patients with neuromuscular respiratory failure, and its indications may be expanded in the future.

Quasifree (p, 2p) Reactions on Oxygen Isotopes: Observation of Isospin Independence of the Reduced Single-Particle Strength

Abstract: Quasifree one-proton knockout reactions have been employed in inverse kinematics for a systematic study of the structure of stable and exotic oxygen isotopes at the R3B/LAND setup with incident beam energies in the range of 300-450 MeV/u. The oxygen isotopic chain offers a large variation of separation energies that allows for a quantitative understanding of single-particle strength with changing isospin asymmetry. Quasifree knockout reactions provide a complementary approach to intermediate-energy one-nucleon removal reactions. Inclusive cross sections for quasifree knockout reactions of the type OA(p,2p)NA-1 have been determined and compared to calculations based on the eikonal reaction theory. The reduction factors for the single-particle strength with respect to the independent-particle model were obtained and compared to state-of-the-art ab initio predictions. The results do not show any significant dependence on proton-neutron asymmetry.

A Model for Extending Hands‐On Science to Be Inquiry Based

Abstract: Many popular hands-on science activities, as traditionally implemented, fail to support inquiry-based science instruction, because the activities direct teachers to terminate lessons prematurely. This paper presents a model describing one approach for extending seemingly limited hands-on activities into full-inquiry science lessons. The strategy involves (a) discrepant events to engage students in direct inquiry; (b) teacher-supported brainstorming activities to facilitate students in planning investigations; (c) effective written job performance aids to provide structure and support; (d) requirements that students provide a product of their research, which usually includes a class presentation and a graph; and (e) class discussion and writing activities to facilitate students in reflecting on their activities and learning. The paper presents the model as a tool for facilitating science teachers' efforts to understand and implement the type of powerful, effective, and manageable inquiry-based science instruction called for in the National Science Education Standards.