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Articles 1 - 9 of 9
Full-Text Articles in Physics
Prototyping Method For Bragg Type Atom Interferometers, Brandon Benton, Michael Krygier, Jeffrey Heward, Mark Edwards, Charles W. Clark
Prototyping Method For Bragg Type Atom Interferometers, Brandon Benton, Michael Krygier, Jeffrey Heward, Mark Edwards, Charles W. Clark
Department of Physics and Astronomy Faculty Publications
We present a method for rapid prototyping of new Bragg ultra-cold atom interferometer (AI) designs useful for assessing the performance of such interferometers. The method simulates the overall effect on the condensate wave function in a given AI design using two separate elements. These are (1) modeling the effect of a Bragg pulse on the wave function and (2) approximating the evolution of the wave function during the intervals between the pulses. The actual sequence of these pulses and intervals is then followed to determine the approximate final wave function from which the interference pattern can be calculated. The exact …
The Arecibo Legacy Fast Alfa Survey: The Α.40 H I Source Catalog, Its Characteristics And Their Impact On The Derivation Of The H I Mass Function, Martha P. Haynes, Riccardo Giovanelli, Ann M. Martin, Kelley M. Hess, Amelie Saintonge, Elizabeth A. K. Adams, Gregory Hallenbeck, G. Lyle Hoffman, Shan Huang, Brian R. Kent, Rebecca A. Koopman, Emmanouil Papastergis, Sabrina Stierwalt, Thomas J. Balonek, David W. Craig, Sarah J.U. Higdon, David A. Kornreich, Jeffrey R. Miller, Aileen A. O'Donoghue, Ronald P. Olowin, Jessica L. Rosenberg, Kristine Spekkens, Parker Troischt, Eric M. Wilcots
The Arecibo Legacy Fast Alfa Survey: The Α.40 H I Source Catalog, Its Characteristics And Their Impact On The Derivation Of The H I Mass Function, Martha P. Haynes, Riccardo Giovanelli, Ann M. Martin, Kelley M. Hess, Amelie Saintonge, Elizabeth A. K. Adams, Gregory Hallenbeck, G. Lyle Hoffman, Shan Huang, Brian R. Kent, Rebecca A. Koopman, Emmanouil Papastergis, Sabrina Stierwalt, Thomas J. Balonek, David W. Craig, Sarah J.U. Higdon, David A. Kornreich, Jeffrey R. Miller, Aileen A. O'Donoghue, Ronald P. Olowin, Jessica L. Rosenberg, Kristine Spekkens, Parker Troischt, Eric M. Wilcots
Department of Physics and Astronomy Faculty Publications
We present a current catalog of 21?cm H I line sources extracted from the Arecibo Legacy Fast Arecibo L-band Feed Array (ALFALFA) survey over ~2800?deg2 of sky: the ?.40 catalog. Covering 40% of the final survey area, the ?.40 catalog contains 15,855 sources in the regions 07h30m < R.A. < 16h30m, +04? < decl.z < 0.25. A detailed analysis is presented of the completeness, width-dependent sensitivity function and bias inherent of the ?.40 catalog. The impact of survey selection, distance errors, current volume coverage, and local large-scale structure on the derivation of the H I mass function is assessed. While ?.40 does not yet provide a completely representative sampling of cosmological volume, derivations of the H I mass function using future data releases from ALFALFA will further improve both statistical and systematic uncertainties.
Polynitroxylated Pegylated Hemoglobin: A Novel Neuroprotective Hemoglobin For Acute Volume-Limited Fluid Resuscitation After Combined Traumatic Brain Injury And Hemorrhagic Hypotension In Mice, David K. Shellington, Lina Du, Xianren Wu, Jennifer Exo, Vincent A. Vagni, Li Ma, Keri Janesko-Feldman, Robert S. B. Clark, Hülya Bayır, C. Edward Dixon, Larry W. Jenkins, Carleton J. C. Hsia, Patrick M. Kochanek
Polynitroxylated Pegylated Hemoglobin: A Novel Neuroprotective Hemoglobin For Acute Volume-Limited Fluid Resuscitation After Combined Traumatic Brain Injury And Hemorrhagic Hypotension In Mice, David K. Shellington, Lina Du, Xianren Wu, Jennifer Exo, Vincent A. Vagni, Li Ma, Keri Janesko-Feldman, Robert S. B. Clark, Hülya Bayır, C. Edward Dixon, Larry W. Jenkins, Carleton J. C. Hsia, Patrick M. Kochanek
Department of Physics and Astronomy Faculty Publications
Objective: Resuscitation of hemorrhagic hypotension after traumatic brain injury is challenging. A hemoglobin-based oxygen carrier may offer advantages. The novel therapeutic hemoglobin-based oxygen carrier, polynitroxylated pegylated hemoglobin (PNPH), may represent a neuroprotective hemoglobin-based oxygen carrier for traumatic brain injury resuscitation.
Hypotheses: 1) PNPH is a unique non-neurotoxic hemoglobin-based oxygen carrier in neuronal culture and is neuroprotective in in vitro neuronal injury models. 2) Resuscitation with PNPH would require less volume to restore mean arterial blood pressure than lactated Ringer's or Hextend and confer neuroprotection in a mouse model of traumatic brain injury plus hemorrhagic hypotension.
Design: Prospective randomized, controlled experimental …
Color Control And White Light Generation Of Upconversion Luminescence By Operating Dopant Concentrations And Pump Densities In Yb3+, Er3+, And Tm3+ Tri-Doped Lu2O3 Nanocrystals, Yanping Li, Jiahua Zhang, Yongshi Luo, Xia Zhang, Zhendong Hao, Xiao-Jun Wang
Color Control And White Light Generation Of Upconversion Luminescence By Operating Dopant Concentrations And Pump Densities In Yb3+, Er3+, And Tm3+ Tri-Doped Lu2O3 Nanocrystals, Yanping Li, Jiahua Zhang, Yongshi Luo, Xia Zhang, Zhendong Hao, Xiao-Jun Wang
Department of Physics and Astronomy Faculty Publications
We synthesized a series of Yb3+, Er3+ and Tm3+ tri-doped Lu2O3 nanocrystals with various dopant concentrations by the hydrothermal approach. Due to a unique electronic state at the top of the valence band, Lu2O3 based materials exhibit intense upconversion luminescence involving 1G4 → 3H6 of Tm3+ in blue, (2H11/2, 4S3/2) → 4I15/2 in green and 4F9/2 → 4I15/2 in red of Er3+ upon near infrared excitation …
Cell Count Moments In The Halo Model, J. N. Fry, S. Colombi, Pablo Fosalba, Anand Balaraman, István Szapudi, R. Teyssier
Cell Count Moments In The Halo Model, J. N. Fry, S. Colombi, Pablo Fosalba, Anand Balaraman, István Szapudi, R. Teyssier
Department of Physics and Astronomy Faculty Publications
We study cell count moments up to fifth order of the distributions of haloes, of halo substructures as a proxy for galaxies, and of mass in the context of the halo model and compare theoretical predictions to the results of numerical simulations. On scales larger than the size of the largest cluster, we present a simple point cluster model in which results depend only on cluster–cluster correlations and on the distribution of the number of objects within a cluster, or cluster occupancy. The point cluster model leads to expressions for moments of galaxy counts in which the volume-averaged moments on …
Generation Of Broadband Emission By Incorporating N3- Into Ca3Sc2Si3O12:Ce3+ Garnet For High Rendering White Leds, Yongfu Liu, Xia Zhang, Zhendong Hao, Xiao-Jun Wang, Jiahua Zhang
Generation Of Broadband Emission By Incorporating N3- Into Ca3Sc2Si3O12:Ce3+ Garnet For High Rendering White Leds, Yongfu Liu, Xia Zhang, Zhendong Hao, Xiao-Jun Wang, Jiahua Zhang
Department of Physics and Astronomy Faculty Publications
Adding Si3N4 into green emitting Ca3Sc2Si3O12:Ce3+ garnet phosphor generates an additionally red emission band peaking around 610 nm that are assigned to Ce3+ ions having N3− in their local coordination. The excitation spectrum of the red band consists of not only a distinct band at 510 nm of itself but also an intense blue band at 450 nm that belongs to the typical Ce3+ ions with green emission, indicating a notable energy transfer from the green emitting Ce3+ ions to the red ones. The …
Predicted Ultrafast Dynamic Metallization Of Dielectric Nanofilms By Strong Single-Cycle Optical Fields, Maxim Durach, Anastasia Rusina, Matthias F. Kling, Mark I. Stockman
Predicted Ultrafast Dynamic Metallization Of Dielectric Nanofilms By Strong Single-Cycle Optical Fields, Maxim Durach, Anastasia Rusina, Matthias F. Kling, Mark I. Stockman
Department of Physics and Astronomy Faculty Publications
We predict a dynamic metallization effect where an ultrafast (single-cycle) optical pulse with a ≲1 V/Åfield causes plasmonic metal-like behavior of a dielectric film with a few-nm thickness. This manifests itself in plasmonic oscillations of polarization and a significant population of the conduction band evolving on a ∼1 fs time scale. These phenomena are due to a combination of both adiabatic (reversible) and diabatic (for practical purposes irreversible) pathways.
Wheels Of Fire. Iv: Star Formation And The Neutral Ism In The Ring Galaxy Am0644-741, James L. Higdon, Sarah J.U. Higdon
Wheels Of Fire. Iv: Star Formation And The Neutral Ism In The Ring Galaxy Am0644-741, James L. Higdon, Sarah J.U. Higdon
Department of Physics and Astronomy Faculty Publications
We combine data from the Australia Telescope National Facility and Swedish ESO Submillimeter Telescope to investigate the neutral interstellar medium (ISM) in AM0644-741, a large and robustly star-forming ring galaxy. The galaxy's ISM is concentrated in the 42 kpc diameter starburst ring, but appears dominated by atomic gas, with a global molecular fraction (f mol) of only 0.062 ± 0.005. Apart from the starburst peak, the gas ring appears stable against the growth of gravitational instabilities (Q gas = 3-11). Including the stellar component lowers Q overall, but not enough to make Q < 1 everywhere. High star formation efficiencies (SFEs) follow from the ring's low H2 content. AM0644-741's star formation law is highly peculiar: H I obeys a Schmidt law while H2 is uncorrelated with star formation rate density. Photodissociation models yield low volume densities in the ring, especially in the starburst quadrant (n 2 cm–3), implying a …
Hst Morphologies Of Z~2 Dust Obscured Galaxies Ii. Bump Sources, R. Shane Bussmann, Arjun Day, Jennifer Lotz, Lee Armus, Michael J. I. Brown, Peter Eisenhardt, James L. Higdon, Sarah J.U. Higdon, Buell T. Januzzi, Emeric Le Floc'h, J. Melbourne, B. T. Soifer, Daniel Weedman
Hst Morphologies Of Z~2 Dust Obscured Galaxies Ii. Bump Sources, R. Shane Bussmann, Arjun Day, Jennifer Lotz, Lee Armus, Michael J. I. Brown, Peter Eisenhardt, James L. Higdon, Sarah J.U. Higdon, Buell T. Januzzi, Emeric Le Floc'h, J. Melbourne, B. T. Soifer, Daniel Weedman
Department of Physics and Astronomy Faculty Publications
We present Hubble Space Telescope imaging of 22 ultra-luminous infrared galaxies (ULIRGs) at z 2 with extremely red R – [24] colors (called dust-obscured galaxies, or DOGs) which have a local maximum in their spectral energy distribution (SED) at rest-frame 1.6 μm associated with stellar emission. These sources, which we call "bump DOGs," have star formation rates (SFRs) of 400-4000 M ☉ yr–1 and have redshifts derived from mid-IR spectra which show strong polycyclic aromatic hydrocarbon emission—a sign of vigorous ongoing star formation. Using a uniform morphological analysis, we look for quantifiable differences between bump DOGs, power-law DOGs (Spitzer …