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Articles 1 - 30 of 69
Full-Text Articles in Physics
Exchange-Coupling Behavior In Srfe12o19/La0.7sr0.3mno3 Nanocomposites, Jiba Nath Dahal, Dipesh Neupane, Sanjay R. Mishra
Exchange-Coupling Behavior In Srfe12o19/La0.7sr0.3mno3 Nanocomposites, Jiba Nath Dahal, Dipesh Neupane, Sanjay R. Mishra
Department of Physics and Astronomy Faculty Publications
Magnetically hard-soft (100-x) SrFe12O19–x wt % La0.7Sr0.3MnO3 nanocomposites were synthesized via a one-pot auto-combustion technique using nitrate salts followed by heat treatment in air at 950 °C. X-ray diffraction (XRD), transmission electron microscopy (TEM), and vibrating sample magnetometry (VSM) were used to characterize the structural and magnetic properties of the samples. XRD spectra revealed the formation of a mixture of ferrite and magnetite phases without any trace of secondary phases in the composite. Microstructural images show the proximity grain growth of both phases. The room temperature hysteresis loops of the samples showed the presence of exchange-coupling between the hard and …
Structural, Magnetic, And Mössbauer Studies Of Transition Metal-Doped Gd2fe16ga0.5tm0.5 Intermetallic Compounds (Tm = Cr, Mn, Co, Ni, Cu, And Zn), Jiba Dahal, K. S. Syed Ali, S. R. Mishra, J. Alam
Structural, Magnetic, And Mössbauer Studies Of Transition Metal-Doped Gd2fe16ga0.5tm0.5 Intermetallic Compounds (Tm = Cr, Mn, Co, Ni, Cu, And Zn), Jiba Dahal, K. S. Syed Ali, S. R. Mishra, J. Alam
Department of Physics and Astronomy Faculty Publications
The effect of transition metal substitution for Fe and the structural and magnetic properties of Gd2Fe16Ga0.5TM0.5 (TM = Cr, Mn, Co, Ni, Cu, and Zn) compounds were investigated in this study. Rietveld analysis of X-ray data indicates that all the samples crystallize in the hexagonal Th2Ni17 structure. The lattice parameters a, c, and the unit cell volume show TM ionic radii dependence. Both Ga and TM atoms show preferred site occupancy for 12j and 12k sites. The saturation magnetization at room temperature was observed for Co, Ni, and Cu of …
Molecular Gas And Star Formation In The Cartwheel, James L. Higdon, Sarah J.U. Higdon, Sergio Martín Ruiz, Richard J. Rand
Molecular Gas And Star Formation In The Cartwheel, James L. Higdon, Sarah J.U. Higdon, Sergio Martín Ruiz, Richard J. Rand
Department of Physics and Astronomy Faculty Publications
Atacama Large Millimeter/submillimeter Array 12CO(J = 1–0) observations are used to study the cold molecular ISM of the Cartwheel ring galaxy and its relation to H i and massive star formation (SF). CO moment maps find (2.69 ± 0.05) × 109 M⊙ of H2 associated with the inner ring (72%) and nucleus (28%) for a Galactic ICO-to- conversion factor (αCO). The spokes and disk are not detected. Analysis of the inner ring's CO kinematics shows it to be expanding (Vexp = 68.9 ± 4.9 km s−1), implying an ≈70 Myr age. Stack averaging …
Hyperscaling Violation And Electroweak Symmetry Breaking, Daniel Elander, Robert Lawrence, Maurizio Piai
Hyperscaling Violation And Electroweak Symmetry Breaking, Daniel Elander, Robert Lawrence, Maurizio Piai
Department of Physics and Astronomy Faculty Publications
We consider a class of simplifed models of dynamical electroweak symmetry breaking built in terms of their fve-dimensional weakly-coupled gravity duals, in the spirit of bottom-up holography. The sigma-model consists of two abelian gauge bosons and one real, non-charged scalar feld coupled to gravity in fve dimensions. The scalar potential is a simple exponential function of the scalar feld. The background metric resulting from solving the classical equations of motion exhibits hyperscaling violation, at least at asymptotically large values of the radial direction. We study the spectrum of scalar composite states of the putative dual feld theory by fuctuating the …
Hyperbolic Resonances Of Metasurface Cavities, David Keene, Maxim Durach
Hyperbolic Resonances Of Metasurface Cavities, David Keene, Maxim Durach
Department of Physics and Astronomy Faculty Publications
We propose a new class of optical resonator structures featuring one or two metasurface reflectors or metacavities and predict that such resonators support novel hyperbolic resonances. As an example of such resonances we introduce hyperbolic Tamm plasmons (HTPs) and hyperbolic Fabry-Perot resonances (HFPs). The hyperbolic optical modes feature low-loss incident power re-distribution over TM and TE polarization output channels, clover-leaf anisotropic dispersion, and other unique properties which are tunable and are useful for multiple applications.
Surface Structure And Surface Kinetics Of Inn Grown By Plasma-Assisted Atomic Layer Epitaxy: A Hreels Study, Ananta Acharya, Brian D. Thoms, Neeraj Nepal, Charles R. Eddy Jr.
Surface Structure And Surface Kinetics Of Inn Grown By Plasma-Assisted Atomic Layer Epitaxy: A Hreels Study, Ananta Acharya, Brian D. Thoms, Neeraj Nepal, Charles R. Eddy Jr.
Department of Physics and Astronomy Faculty Publications
The surface bonding configuration and kinetics of hydrogen desorption from InN grown by plasma-assisted atomic layer epitaxy have been investigated. High resolution electron energy loss spectra exhibited loss peaks assigned to a Fuchs–Kliewer surface phonon, N-N and N-H surface species. The surface N-N vibrations are attributed to surface defects. The observation of N-H but no In-Hsurface species suggested N-terminated InN. Isothermal desorption data were best fit by the first-order desorption kinetics with an activation energy of (0.88 ± 0.06) eV and pre-exponential factor of (1.5 ± 0.5) × 105 s−1.
Resistive Flow In A Weakly Interacting Bose-Einstein Condensate, Fred Jendrzejewski, Stephen Eckel, Nicholas Murray, C. Lanier, Mark Edwards, Christopher J. Lobb, Gretchen K. Campbell
Resistive Flow In A Weakly Interacting Bose-Einstein Condensate, Fred Jendrzejewski, Stephen Eckel, Nicholas Murray, C. Lanier, Mark Edwards, Christopher J. Lobb, Gretchen K. Campbell
Department of Physics and Astronomy Faculty Publications
We report the direct observation of resistive flow through a weak link in a weakly interacting atomic Bose-Einstein condensate. Two weak links separate our ring-shaped superfluid atomtronic circuit into two distinct regions, a source and a drain. Motion of these weak links allows for creation of controlled flow between the source and the drain. At a critical value of the weak link velocity, we observe a transition from superfluid flow to superfluid plus resistive flow. Working in the hydrodynamic limit, we observe a conductivity that is 4 orders of magnitude larger than previously reported conductivities for a Bose-Einstein condensate with …
Spontaneous Emission Of Electric And Magnetic Dipoles In The Vicinity Of Thin And Thick Metal, Rabia Hussain, David Keene, Natalia Noginova, Maxim Durach
Spontaneous Emission Of Electric And Magnetic Dipoles In The Vicinity Of Thin And Thick Metal, Rabia Hussain, David Keene, Natalia Noginova, Maxim Durach
Department of Physics and Astronomy Faculty Publications
Strong modification of spontaneous emission of Eu3+ ions placed in close vicinity to thin and thick gold and silver films was clearly demonstrated in a microscope setup separately for electric and magnetic dipole transitions. We have shown that the magnetic transition was very sensitive to the thickness of the gold substrate and behaved distinctly different from the electric transition. The observations were described theoretically based on the dyadic Green’s function approach for layered media and explained through modified image models for the near and far-field emissions. We established that there exists a “near-field event horizon”, which demarcates the distance from …
Fabricating Microfluidic Valve Master Molds In Su‐8 Photoresist, Aaron Dy, Alin Cosmanescu, James Sluka, James Glazier, Dwayne Stupack, Dragos Amarie
Fabricating Microfluidic Valve Master Molds In Su‐8 Photoresist, Aaron Dy, Alin Cosmanescu, James Sluka, James Glazier, Dwayne Stupack, Dragos Amarie
Department of Physics and Astronomy Faculty Publications
Multilayer soft lithography has become a powerful tool in analytical chemistry, biochemistry, material and life sciences, and medical research. Complex fluidic micro-circuits require reliable components that integrate easily into microchips. We introduce two novel approaches to master mold fabrication for constructing in-line micro-valves using SU-8. Our fabrication techniques enable robust and versatile integration of many lab-on-a-chip functions including filters, mixers, pumps, stream focusing and cell-culture chambers, with in-line valves. SU-8 created more robust valve master molds than the conventional positive photoresists used in multilayer soft lithography, but maintained the advantages of biocompatibility and rapid prototyping. As an example, we used …
Secular Damping Of Stellar Bars In Spinning Dark Matter Halos, Stacy Long, Isaac Shlosman, Clayton Heller
Secular Damping Of Stellar Bars In Spinning Dark Matter Halos, Stacy Long, Isaac Shlosman, Clayton Heller
Department of Physics and Astronomy Faculty Publications
We demonstrate using numerical simulations of isolated galaxies that growth of stellar bars in spinning dark matter halos is heavily suppressed in the secular phase of evolution. In a representative set of models, we show that for values of the cosmological spin parameter λ ≳ 0.03, bar growth (in strength and size) becomes increasingly quenched. Furthermore, the slowdown of the bar pattern speed weakens considerably with increasing λ until it ceases completely. The terminal structure of the bars is affected as well, including extent and shape of their boxy/peanut bulges. The essence of this effect lies in the modified angular …
Star Formation And The Interstellar Medium In Nearby Tidal Streams (Saints): Spitzer Mid-Infrared Spectroscopy And Imaging Of Intergalactic Star-Forming Objects, Sarah J.U. Higdon, James L. Higdon, B. J. Smith, M. Hancock
Star Formation And The Interstellar Medium In Nearby Tidal Streams (Saints): Spitzer Mid-Infrared Spectroscopy And Imaging Of Intergalactic Star-Forming Objects, Sarah J.U. Higdon, James L. Higdon, B. J. Smith, M. Hancock
Department of Physics and Astronomy Faculty Publications
A spectroscopic analysis of 10 intergalactic star-forming objects (ISFOs) and a photometric analysis of 67 ISFOs in a sample of 14 interacting systems is presented. The majority of the ISFOs have relative polycyclic aromatic hydrocarbon (PAH) band strengths similar to those of nearby spiral and starburst galaxies. In contrast to what is observed in blue compact dwarfs (BCDs) and local giant H ii regions in the Milky Way (NGC 3603) and the Magellanic Clouds (30 Doradus and N 66), the relative PAH band strengths in ISFOs correspond to models with a significant PAH ion fraction (3.7, i.e., enhanced non-stellar emission, …
The Second-Generation Z (Redshift) And Early Universe Spectrometer. I. First-Light Observation Of A Highly Lensed Local Ulirg Analog At High-Z, Carl Ferkinhoff, Drew Brisbin, Stephen Parshley, Thomas Nikola, Gordon J. Stacey, Justin Schoenwald, James L. Higdon, Sarah J.U. Higdon, Aprajit Verma, Dominik Riechers, Steven Hailey-Dunsheath, Karl M. Menten, Rolf Güsten, Axel Weiß, Kent Irwin, Hsiao M. Cho, Michael Niemack, Mark Halpern, Mandana Amiri, Matthew Hasselfield, D.V. Wiebe, Peter A.R. Ade, Carol E. Tucker
The Second-Generation Z (Redshift) And Early Universe Spectrometer. I. First-Light Observation Of A Highly Lensed Local Ulirg Analog At High-Z, Carl Ferkinhoff, Drew Brisbin, Stephen Parshley, Thomas Nikola, Gordon J. Stacey, Justin Schoenwald, James L. Higdon, Sarah J.U. Higdon, Aprajit Verma, Dominik Riechers, Steven Hailey-Dunsheath, Karl M. Menten, Rolf Güsten, Axel Weiß, Kent Irwin, Hsiao M. Cho, Michael Niemack, Mark Halpern, Mandana Amiri, Matthew Hasselfield, D.V. Wiebe, Peter A.R. Ade, Carol E. Tucker
Department of Physics and Astronomy Faculty Publications
We recently commissioned our new spectrometer, the second-generation z(Redshift) and Early Universe Spectrometer (ZEUS-2) on the Atacama Pathfinder Experiment telescope. ZEUS-2 is a submillimeter grating spectrometer optimized for detecting the faint and broad lines from distant galaxies that are redshifted into the telluric windows from 200 to 850 μm. It uses a focal plane array of transition-edge sensed bolometers, the first use of these arrays for astrophysical spectroscopy. ZEUS-2 promises to be an important tool for studying galaxies in the years to come because of its synergy with Atacama Large Millimeter Array and its capabilities in the short submillimeter …
Probing The Circulation Of Ring-Shaped Bose-Einstein Condensates, Noel Murray, Michael Krygier, Mark Edwards, K. C. Wright, Gretchen K. Campbell, Charles W. Clark
Probing The Circulation Of Ring-Shaped Bose-Einstein Condensates, Noel Murray, Michael Krygier, Mark Edwards, K. C. Wright, Gretchen K. Campbell, Charles W. Clark
Department of Physics and Astronomy Faculty Publications
This paper reports the results of a theoretical and experimental study of how the initial circulation of ring-shaped Bose-Einstein condensates (BECs) can be probed by time-of-flight (TOF) images. We have studied the dynamics of a BEC after release from a toroidal trap potential by solving the three-dimensional Gross-Pitaevskii (GP) equation. The trap and condensate characteristics matched those of a recent experiment. The circulation, experimentally imparted to the condensate by stirring, was simulated by imprinting a linear azimuthal phase on the initial condensate wave function. The simulated TOF images were in good agreement with the experimental data. We find that upon …
Energy Flux Streamlines Versus Acoustic Rays For Modeling Interaction With Rigid Boundaries: Near Field Of Sound From A Circular Loudspeaker, Cleon Dean, James P. Braselton
Energy Flux Streamlines Versus Acoustic Rays For Modeling Interaction With Rigid Boundaries: Near Field Of Sound From A Circular Loudspeaker, Cleon Dean, James P. Braselton
Department of Physics and Astronomy Faculty Publications
Sound emitted by a circular loudspeaker can be treated as equivalent to a plane wave diffracted by a circular aperture in a rigid, sound absorbing screen. Axial symmetry leads one to expect constructive interference along the symmetry axis in the near field (the Poisson-Arago spot). An energy flux streamline model was developed to help visualize this and other features of the nearsound field. The model is used to draw out similarities and differences between energy flux streamlines and acoustic rays, particularly in the transition to the far field. © 2013 Acoustical Society of America
Spectral Modulation Through Controlling Anions In Nanocaged Phosphors, Hongyu Bian, Yuxue Liu, Duanting Yan, Hancheng Zhu, Chunguang Liu, Changshan Xu, Yichun Liu, Hong Zhang, Xiao-Jun Wang
Spectral Modulation Through Controlling Anions In Nanocaged Phosphors, Hongyu Bian, Yuxue Liu, Duanting Yan, Hancheng Zhu, Chunguang Liu, Changshan Xu, Yichun Liu, Hong Zhang, Xiao-Jun Wang
Department of Physics and Astronomy Faculty Publications
A new approach has been proposed and validated to modulate the emission spectra of europium-doped 12CaO·7Al2O3 phosphors by tuning the nonradiative and radiative transition rates, realized by controlling the sort and amount of the encaged anions. A single wavelength at 255 nm can excite simultaneously Eu2+ and Eu3+ centres to yield blue and red emissions, respectively. The amount of the anions in the nanocages, like OH− and H−, can be controlled by heat treatment processes. The existence of encaged OH− accelerates the nonradiative process of the emission centres, while the presence …
A Multiphase Strategy For Realizing Green Cathodoluminescence In 12cao·7al2o3–Caceal3o7:Ce3+,Tb3+ Conductive Phosphor, Xiuling Liu, Yuxue Liu, Duanting Yan, Hancheng Zhu, Chunguang Liu, Weizhen Liu, Changshan Xu, Yichun Liu, Hong Zhang, Xiao-Jun Wang
A Multiphase Strategy For Realizing Green Cathodoluminescence In 12cao·7al2o3–Caceal3o7:Ce3+,Tb3+ Conductive Phosphor, Xiuling Liu, Yuxue Liu, Duanting Yan, Hancheng Zhu, Chunguang Liu, Weizhen Liu, Changshan Xu, Yichun Liu, Hong Zhang, Xiao-Jun Wang
Department of Physics and Astronomy Faculty Publications
A multiphase strategy is proposed and successfully applied to make the insulating green phosphor CaCeAl3O7:Tb3+ conductive in the form of 12CaO·7Al2O3–CaCeAl3O7:Ce3+,Tb3+. The phosphor shows bright green-light emission with a short lifetime (2.51 ms) under low-voltage electron beam excitation (3 kV). The green photo- and cathodoluminescence from 5D4–7FJ (J = 6, 5, 4, 3) transitions of Tb3+ are significantly enhanced in comparison with pure C12A7:Tb3+. It was confirmed that this enhancement is the consequence …
New Yellow Ba0.93Eu0.07Al2O4, Xufan Li, John D. Budai, Feng Liu, Jane Y. Howe, Jiahua Zhang, Xiao-Jun Wang, Zhanjun Gu, Chengjun Sun, Richard S. Meltzer, Zhengwei Pan
New Yellow Ba0.93Eu0.07Al2O4, Xufan Li, John D. Budai, Feng Liu, Jane Y. Howe, Jiahua Zhang, Xiao-Jun Wang, Zhanjun Gu, Chengjun Sun, Richard S. Meltzer, Zhengwei Pan
Department of Physics and Astronomy Faculty Publications
Phosphor-converted white light-emitting diodes for indoor illumination need to be warm-white (i.e., correlated color temperature <4000 >K) with good color rendition (i.e., color rendering index >80). However, no single-phosphor, single-emitting-center-converted white light-emitting diodes can simultaneously satisfy the color temperature and rendition requirements due to the lack of sufficient red spectral component in the phosphors’ emission spectrum. Here, we report a new yellow Ba0.93Eu0.07Al2O4phosphor that has a new orthorhombic lattice structure and exhibits a broad yellow photoluminescence band with sufficient red spectral component. Warm-white emissions with correlated color temperature 80 were readily achieved when …
Color Tuning Of (K1−X,Nax)Srpo4:0.005eu2+, Ytb3+ Blue-Emitting Phosphors Via Crystal Field Modulation And Energy Transfer, Pengpeng Dai, Xintong Zhang, Lulu Bian, Shan Lu, Yichun Liu, Xiao-Jun Wang
Color Tuning Of (K1−X,Nax)Srpo4:0.005eu2+, Ytb3+ Blue-Emitting Phosphors Via Crystal Field Modulation And Energy Transfer, Pengpeng Dai, Xintong Zhang, Lulu Bian, Shan Lu, Yichun Liu, Xiao-Jun Wang
Department of Physics and Astronomy Faculty Publications
Two series of K1−xNaxSrPO4:0.005Eu2+ and K0.4Na0.6Sr0.995−yPO4:0.005Eu2+, yTb3+ phosphors are synthesized via a high-temperature solid-state reaction. Their emission color can be tuned from deep blue to blue–green by modulating the crystal field strength and energy transfer. Partial substitution of K+ with Na+ results in a contraction and distortion of the unit cell of the K1−xNaxSr0.995PO4:0.005Eu2+ host, tuning the emission from 426 to 498 nm. The red-shifted emission is …
Transforming Fabry-Pérot Resonances Into A Tamm Mode, Maxim Durach, Anastasia Rusina
Transforming Fabry-Pérot Resonances Into A Tamm Mode, Maxim Durach, Anastasia Rusina
Department of Physics and Astronomy Faculty Publications
We propose an optical structure composed of two metal nanolayers enclosing a distributed Bragg reflector (DBR) mirror. The structure is an open photonic system whose bound modes are coupled to external radiation. We apply the special theoretical treatment based on inversion symmetry of the structure to classify its resonances. We show that the structure supports resonances transitional between Fabry-Pérot modes and Tamm plasmons. When the dielectric contrast of the DBR is removed these modes are a pair of conventional Fabry-Pérot resonances. They spectrally merge into a Tamm mode at high contrast. The optical properties of the structure in the frequency …
Approximate Mean-Field Equations Of Motion For Quasi-Two-Dimensional Bose-Einstein Condensates, Mark Edwards, Michael Krygier, Hadayat Seddiqi, Brandon Benton, Charles W. Clark
Approximate Mean-Field Equations Of Motion For Quasi-Two-Dimensional Bose-Einstein Condensates, Mark Edwards, Michael Krygier, Hadayat Seddiqi, Brandon Benton, Charles W. Clark
Department of Physics and Astronomy Faculty Publications
We present a method for approximating the solution of the three-dimensional, time-dependent Gross-Pitaevskii equation (GPE) for Bose-Einstein-condensate systems where the confinement in one dimension is much tighter than in the other two. This method employs a hybrid Lagrangian variational technique whose trial wave function is the product of a completely unspecified function of the coordinates in the plane of weak confinement and a Gaussian in the strongly confined direction having a time-dependent width and quadratic phase. The hybrid Lagrangian variational method produces equations of motion that consist of (1) a two-dimensional (2D) effective GPE whose nonlinear coefficient contains the width …
A Ray Model Of Sound Focusing With A Balloon Lens: An Experiment For High School Students, Cleon Dean, Kendez Parker
A Ray Model Of Sound Focusing With A Balloon Lens: An Experiment For High School Students, Cleon Dean, Kendez Parker
Department of Physics and Astronomy Faculty Publications
A weather balloon filled with carbon dioxide gas is used as a positive spherical acoustic lens. High frequency but audible sound from a circular loudspeaker ensonifies the balloon and produces increased sound pressure levels in a region along the principal axis according to a ray acoustics model. This enhancement was measured experimentally and was found to agree with theory. The possibility that interference from reflected sound off walls or the floor could mask or mimic the expected focusing was countered by calculating and measuring within a “shadow zone” in which only direct rays or rays refracted by the balloon exist …
Metric Theory Of Gravity With Torsion In An Extra Dimension, Karthik H. Shankar, Anand Balaraman, Kameshwar C. Wali
Metric Theory Of Gravity With Torsion In An Extra Dimension, Karthik H. Shankar, Anand Balaraman, Kameshwar C. Wali
Department of Physics and Astronomy Faculty Publications
We consider a theory of gravity with a hidden extra dimension and metric-dependent torsion. A set of physically motivated constraints are imposed on the geometry so that the torsion stays confined to the extra dimension and the extra dimension stays hidden at the level of four-dimensional geodesic motion. At the kinematic level, the theory maps onto general relativity, but the dynamical field equations that follow from the action principle deviate markedly from the standard Einstein equations. We study static spherically symmetric vacuum solutions and homogeneous-isotropic cosmological solutions that emerge from the field equations. In both cases, we find solutions of …
Single-Phased White-Emitting 12cao·7al2o3:Ce3+, Dy3+ Phosphors With Suitable Electrical Conductivity For Field Emission Displays, Xiuling Liu, Yuxue Liu, Duanting Yan, Hancheng Zhu, Chunguang Liu, Changshan Xu, Yichun Liu, Xiao-Jun Wang
Single-Phased White-Emitting 12cao·7al2o3:Ce3+, Dy3+ Phosphors With Suitable Electrical Conductivity For Field Emission Displays, Xiuling Liu, Yuxue Liu, Duanting Yan, Hancheng Zhu, Chunguang Liu, Changshan Xu, Yichun Liu, Xiao-Jun Wang
Department of Physics and Astronomy Faculty Publications
A novel white-light-emitting phosphor, 12CaO·7Al2O3:Ce3+, Dy3+with H− encaging, was prepared by the solid-state reaction in H2 atmosphere. Upon excitation at 362 nm, the phosphor shows intense white-light emission that combines the blue and yellow emissions at 476 and 576 nm, assigned to the 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 transitions of Dy3+, respectively. A weak broad blue emission centered at 430 nm is also observed and attributed to the 5d–4f transitions of Ce3+. The photoluminescence intensity of …
A Hemoglobin-Based Multifunctional Therapeutic: Polynitroxylated Pegylated Hemoglobin, Carleton C. J. Hsia, Li Ma
A Hemoglobin-Based Multifunctional Therapeutic: Polynitroxylated Pegylated Hemoglobin, Carleton C. J. Hsia, Li Ma
Department of Physics and Astronomy Faculty Publications
Polynitroxylated pegylated hemoglobin (PNPH) as a multifunctional therapeutic takes advantage of the ability of hemoglobin (Hb) to transport oxygen, the antioxidative stress activities from the redox coupling of nitroxide and heme iron, and the hypercolloid properties of pegylation. The published preclinical data demonstrating that PNPH acts as a neurovascular protective multifunctional therapeutic in an animal model simulating prehospital resuscitation of traumatic brain injury (TBI) with hemorrhagic shock (HS) are reviewed. Preliminary results on the potential utility of PNPH for neurovascular protection in thrombolytic stroke therapy and for correction of vascular dysfunction through transfusion in sickle-cell disease (SCD) are also discussed. …
Polynitroxyl Albumin And Albumin Therapy After Pediatric Asphyxial Cardia Arrest: Effects On Cerebral Blood Flow And Neurologic Outcome, Mioara D. Manole, Patrick M. Kochanek, Lesley M. Foley, T. Kevin Hitchens, Hülya Bayır, Henry Alexander, Robert Garman, Li Ma, Carleton J. C. Hsia, Chien Ho, Robert S. B. Clark
Polynitroxyl Albumin And Albumin Therapy After Pediatric Asphyxial Cardia Arrest: Effects On Cerebral Blood Flow And Neurologic Outcome, Mioara D. Manole, Patrick M. Kochanek, Lesley M. Foley, T. Kevin Hitchens, Hülya Bayır, Henry Alexander, Robert Garman, Li Ma, Carleton J. C. Hsia, Chien Ho, Robert S. B. Clark
Department of Physics and Astronomy Faculty Publications
Postresuscitation cerebral blood flow (CBF) disturbances and generation of reactive oxygen species likely contribute to impaired neurologic outcome after pediatric cardiac arrest (CA). Hence, we determined the effects of the antioxidant colloid polynitroxyl albumin (PNA) versus albumin or normal saline (NS) on CBF and neurologic outcome after asphyxial CA in immature rats. We induced asphyxia for 9 minutes in male and female postnatal day 16 to 18 rats randomized to receive PNA, albumin, or NS at resuscitation from CA or sham surgery. Regional CBF was measured serially from 5 to 150 minutes after resuscitation by arterial spin-labeled magnetic resonance imaging. …
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 …
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 …