Browsing Ohio State University Research and Scholarship by Title
Now showing results 673-692 of 833
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Sagittarius A* Companion S0-2: A Probe of Very High Mass Star Formation
Gould, Andrew; Quillen, Alice ( 2003-08-01 )The star S0-2, which is orbiting Sgr A* with a 15 yr period, almost certainly did not form in situ. We propose that it was injected into this close orbit by the tidal disruption of a massive-star binary, whose primary was ... -
Satellite Parallaxes of Lensing Events toward the Galactic Bulge
Gaudi, B. Scott; Gould, Andrew ( 1997-03-01 )In order to understand the nature of the lenses that generate microlensing events, one would like to measure their mass, distance, and velocity. Unfortunately, current microlensing experiments measure only one parameter ... -
Scaling of Wave-Packet Dynamics in an Intense Midinfrared Field
Tate, J.; Auguste, T.; Muller, H. G.; Salières, P.; Agostini, P.; DiMauro, L. F. ( 2007-01-04 )A theoretical investigation is presented that examines the wavelength scaling from near-visible (0.8 µm) to midinfrared (2 µm) of the photoelectron distribution and high harmonics generated by a "single" atom in an intense ... -
SDWFS-MT-1: A Self-Obscured Luminous Supernova At z ~= 0.2
Kozłowski, Szymon; Kochanek, C. S.; Stern, D.; Thompson, T. A.; Assef, R. J.; Drake, A. J.; Szczygieł, D. M.; Woźniak, P. R.; Nugent, P.; Ashby, M. L. N.; Beshore, E.; Brown, M. J. I.; Dey, Arjun; Griffith, R.; Harrison, F.; Jannuzi, B. T.; Larson, S.; Madsen, K.; Pilecki, B.; Pojmański, G.; Skowron, J.; Vestrand, W. T.; Wren, J. A. ( 2010-10-20 )We report the discovery of a 6 month long mid-infrared transient, SDWFS-MT-1 (aka SN 2007va), in the Spitzer Deep, Wide-Field Survey of the NOAO Deep Wide-Field Survey Boötes field. The transient, located in a z = 0.19 ... -
Search for Cooper-pair fluctuations in severely underdoped Y_1−δCa_δBa_2Cu_3O_6+x films(δ=0 and 0.2)
Zuev, Yuri L.; Hetel, Iulian; Lemberger, Thomas R. ( 2006-07-19 )The preformed-pairs theory of pseudogap physics in high-T_C superconductors predicts a nonanalytic T dependence for the ab-plane superfluid fraction, ρ_S, at low temperatures in underdoped cuprates. We report high-precision ... -
Searching for Failed Supernovae with Astrometric Binaries
Gould, Andrew; Salim, Samir ( 2002-06-20 )Stars in the mass range 8 Msun <~ M <~ 30 Msun are thought to end their lives as luminous supernovae that leave behind a neutron star. However, if a substantial fraction of these stars instead ended as black hole remnants, ... -
Searching for Transiting Planets in Stellar Systems
Pepper, Joshua; Gaudi, B. Scott ( 2005-09-20 )We analyze the properties of searches devoted to finding planetary transits by observing simple stellar systems, such as globular clusters, open clusters, and the Galactic bulge. We develop the analytic tools necessary to ... -
Second Critical Point in First Order Metal-Insulator Transitions
Kostadinov, Ivan Z.; Patton, Bruce R. ( 2008-11-26 )For first order metal-insulator transitions we show that, together with the dc conductance zero, there is a second critical point where the dielectric constant becomes zero and further turns negative. At this point the ... -
A Second Method to Photometrically Align Multi-Site Microlensing Light Curves: Source Color in Planetary Event MOA-2007-BLG-192
Gould, Andrew; Dong, Subo; Bennett, David P.; Bond, Ian A.; Udalski, Andrzej; Kozlowski, Szymon ( 2010-02-20 )At present, microlensing light curves from different telescopes and filters are photometrically aligned by fitting them to a common model.We present a second method based on photometry of common field stars. If two ... -
Seed and molecular resources for Arabidopsis
Scholl, Randy L.; May, Sean T.; Ware, Doreen H. ( 2000-12 ) -
Selection for resistance to oseltamivir in seasonal and pandemic H1N1 influenza and widespread co-circulation of the lineages
Janies, Daniel A.; Voronkin, Igor O.; Studer, Jonathon; Hardman, Jori; Alexandrov, Boyan B.; Treseder, Travis W.; Valson, Chandni ( 2010-02-24 )Background: In Spring 2009, a novel reassortant strain of H1N1 influenza A emerged as a lineage distinct from seasonal H1N1. On June 11, the World Heath Organization declared a pandemic - the first since 1968. There are ... -
Selection of Nearby Microlensing Candidates for Observation by the Space Interferometry Mission
Gould, Andrew ( 2000-04-01 )I investigate the prospects for using the Space Interferometry Mission (SIM) to measure the masses of nearby stars from their gravitational deflection of light from more distant sources, as originally suggested by Paczyński ... -
Selective External Oxidation of the Intermetallic Compound, BaAg_5
Vilayannur, Sitaraman; Sandhage, Kenneth H.; Dregia, Suliman ( 2000-07 )The selective oxidation of BaAg_5 has been examined at 650–680°C in flowing 3%H2/Ar (po2 ≤ 1.1×x×10^–19atm). Under these conditions, a continuous external barium oxide scale formed. Depletion of Ba from the underlying ... -
Self-consistent R-matrix approach to photoionization and unified electron-ion recombination
Nahar, Sultana Nurun; Pradhan, Anil K. ( 2004 )A unified scheme using the R-matrix method has been developed for electron-ion recombination subsuming heretofore separate treatments of radiative and dielectronic recombination (RR and DR). The ab initio approach within ... -
Self-trapping in B-doped amorphous Si: Intrinsic origin of low acceptor efficiency
Santos, I.; Castrillo, P.; Windl, W.; Drabold, D. A.; Pelaz, L.; Marqués, L. A. ( 2010-01-19 )We have used ab initio simulations to study the doping efficiency of amorphous semiconductors, in particular of B-doped amorphous Si. We have found that even in the optimum case of substitutional doping in dangling-bond ... -
The Sensitivity of Gas-Phase Chemical Models of Interstellar Clouds to C and O Elemental Abundances and to a New Formation Mechanism for Ammonia
Terzieva, R.; Herbst, Eric ( 1998-07-01 )The effects of variations in the gas-phase carbon-to-oxygen elemental abundance ratio (0.42 ≤ C/O ≤ 1.2) and the absolute gas-phase carbon and oxygen elemental abundances on calculated molecular concentrations have been ... -
Sensitivity of Transit Searches to Habitable-Zone Planets
Gould, Andrew; Pepper, Joshua; DePoy, D. L. ( 2003-09-01 )Photon-limited transit surveys in the V band are in principle about 20 times more sensitive to planets of fixed size in the habitable zone around M stars than G stars. In the I band the ratio is about 400. The advantages ... -
Sequence divergence of Mus spretus and Mus musculus across a skin cancer susceptibility locus
Mahler, Kimberly; Fleming, Jessica; Dworkin, Amy; Gladman, Nicholas; Cho, Hee Y.; Mao, Jian H.; Balmain, Allan; Toland, Amanda ( 2008-12-23 )Background Mus spretus diverged from Mus musculus over one million years ago. These mice are genetically and phenotypically divergent. Despite the value of utilizing M. musculus and M. spretus for quantitative trait ... -
Sequence variation in ligand binding sites in proteins
Magliery, Thomas J.; Regan, Lynne ( 2005-09-30 )Background: The recent explosion in the availability of complete genome sequences has led to the cataloging of tens of thousands of new proteins and putative proteins. Many of these proteins can be structurally or ... -
Ser170 of Bacillus thuringiensis Cry1Ab δ-endotoxin becomes anchored in a hydrophobic moiety upon insertion of this protein into Manduca sexta brush border membranes
Alzate, Oscar; Hemann, Craig F.; Osorio, Cristina; Hille, Russ; Dean, Donald H. ( 2009-10-19 )Background: Three spin-labeled mutant proteins, mutated at the beginning, middle, and end of α-helix 5 of the Bacillus thuringiensis Cry1Ab δ-endotoxin, were used to study the involvement of these specific amino acid ...