Physical Sciences and Mathematics Commons^™

Contemporary Iron Stone Formation Due To Acid Sulfate Soil Processes, Leigh Sullivan, Richard Bush, Edward Burton

Associate Professor Edward D Burton

One of the defining factors affecting soil formation is parent material: it may therefore be expected that sulfidic parent materials leave acid sulfate soil ‘inprints' within the soil profiles developing on such parent materials. Indeed, acid sulfate soil processes have been thought to be responsible for relict soil features (e.g. Fanning, pers. comm.; Rabenhorst et al 2004). This presentation describes the occurrence of a contemporary iron stone layer (i.e. an indurated layer cemented by iron minerals) within the channel of the Talbragar River in central New South Wales, in Eastern Australia. A long term study has been conducted at this …

Gauge Theory Duals Of Black Hole - Black String Transitions Of Gravitational Theories On A Circle, Simon Catterall, Anosh Joseph, Toby Wiseman

Physics - All Scholarship

We study the black hole - black string phase transitions of gravitational theories compactified on a circle using the holographic duality conjecture. The gauge theory duals of these theories are maximally supersymmetric and strongly coupled 1 + 1 dimensional SU(N) Yang-Mills theories compactified on a circle, in the large N limit. We perform the strongly coupled finite temperature gauge theory calculations on a lattice, using the recently developed exact lattice supersymmetry methods based on topological twisting and orbifolding. The spatial Polyakov line serves as relevant order parameter of the confinement - deconfinement phase transitions in the gauge theory duals.

Thermal Phases Of D1-Branes On A Circle From Lattice Super Yang-Mills, Simon Catterall, Anosh Joseph, Toby Wiseman

Physics - All Scholarship

We report on the results of numerical simulations of 1+1 dimensional SU(N) Yang-Mills theory with maximal supersymmetry at finite temperature and compactified on a circle. For large N this system is thought to provide a dual description of the decoupling limit of N coincident D1-branes on a circle. It has been proposed that at large N there is a phase transition at strong coupling related to the Gregory-Laflamme (GL) phase transition in the holographic gravity dual. In a high temperature limit there was argued to be a deconfinement transition associated to the spatial Polyakov loop, and it has been proposed …

Prompt K0s Production In Pp Collisions At √S=0.9 Tev, Raymond Mountain, Marina Artuso, S. Blusk, Alessandra Borgia

Physics - All Scholarship

The production of K_short mesons in pp collisions at a centre-of-mass energy of 0.9 TeV is studied with the LHCb detector at the Large Hadron Collider. The luminosity of the analysed sample is determined using a novel technique, involving measurements of the beam currents, sizes and positions, and is found to be 6.8 +/- 1.0 microbarn^-1. The differential prompt K_short production cross-section is measured as a function of the K_short transverse momentum and rapidity in the region 0 < pT < 1.6 GeV/c and 2.5 < y < 4.0. The data are found to be in reasonable agreement with previous measurements and generator expectations.

Prompt K_Short Production In Pp Collisions At Sqrt(S)=0.9 Tev, Raymond Mountain, Marina Artuso, S. Blusk, Alessandra Borgia

Physics - All Scholarship

The production of K_short mesons in pp collisions at a centre-of-mass energy of 0.9 TeV is studied with the LHCb detector at the Large Hadron Collider. The luminosity of the analysed sample is determined using a novel technique, involving measurements of the beam currents, sizes and positions, and is found to be 6.8 +/- 1.0 microbarn^-1. The differential prompt K_short production cross-section is measured as a function of the K_short transverse momentum and rapidity in the region 0 < pT < 1.6 GeV/c and 2.5 < y < 4.0. The data are found to be in reasonable agreement with previous measurements and generator expectations.

Radical Spin Helix In Two-Dimensional Electron Systems With Rashba Spin-Orbit Coupling, Yuriy V. Pershin Dr, Valeriy A. Slipko

Faculty Publications

We suggest a long-lived spin-polarization structure, a radial spin helix, and study its relaxation dynamics. For this purpose, starting with a system of equations for spin-polarization density, we find its general solution in the axially symmetric case. It is demonstrated that the radial spin helix of a certain period relaxes slower than homogeneous spin polarization and plain spin helix. Importantly, the spin polarization at the center of the radial spin helix stays almost unchanged at short times. At longer times, when the initial nonexponential relaxation region ends, the relaxation of the radial spin helix occurs with the same time constant …

Professional Implications Of Using Online Social Networking Systems By Persons Who Are Blind, Steven A. Kurutz

Regis University Student Publications (comprehensive collection)

The online social networking (OSN) phenomenon has grown dramatically over the past decade, with websites such as Facebook and Twitter becoming household names. Although a lot of literature exists on online social networking systems, little exists on these systems' practical impact on the offline world, beyond cyberspace. Similarly, little attention has been given to the use of these systems by persons who are blind or have other disabilities. This research attempts to redress this situation by exploring the relationship between the usage of OSN systems and professional achievement for persons who are blind.

2,2′,5,5′-Tetra­Chloro­Benzidine, Onome Ugono, Marcel Douglas, Nigam Rath, Alicia Beatty

Chemistry & Biochemistry Faculty Works

In the crystal structure of the title compound, C12H8Cl4N2, mol­ecules lie on crystallographic twofold axes at the centre of the C-C bonds linking the benzene rings, such that the asymmetric unit consists of a half-mol­ecule. The individual mol­ecules participate in inter­molecular N-H...N, N-H...Cl, C-H...Cl and Cl...Cl [3.4503 (3) Å] inter­actions.

Smith, Charles F., 1954-1972 (Sc 2341), Manuscripts & Folklife Archives

Manuscript Collection Finding Aids

Finding aid only for Manuscripts Small Collection 2341. Entry of Charles F. "Chuck" Smith for a Future Farmers of America Foundation, Inc. Proficiency Award in Soil, Water and Air Management. Includes a note from Smith's chapter advisor on his death in a traffic accident.

2,2′,5,5′-Tetra­Chloro­Benzidine, Onome Ugono, Marcel Douglas, Nigam P. Rath, Alicia M. Beatty

Nigam Rath

2,2′,5,5′-Tetra­Chloro­Benzidine, Onome Ugono, Marcel Douglas, Nigam P. Rath, Alicia M. Beatty

Alicia Beatty

Floristic Investigation Of Crooked Creek Community Of Juan Solomon Park, Indianapolis Indiana, Raelene M. Crandall, Rebecca W. Dolan

Rebecca W. Dolan

The protection of plant resources in urban areas is a growing conservation concern. Inventory activities that document species presence and stewardship plans that protect and enhance these areas are needed. The results of a botanical inventory of the Crooked Creek Community Juan Solomon Park in Indianapolis, Indiana, are reported in this paper. The 46-acre park contains three distinct habitats, supporting a wide variety of plants. One hundred seventy-nine vascular plant species from 64 families were identified, including 53 (29.6%) non-native species that are naturalizing within the park. Despite its high percentage of alien species and urban setting, the park is …

The Climate Of Hd 189733b From Fourteen Transits And Eclipses Measured By Spitzer, Eric Agol, Nicolas B. Cowan, Heather A. Knutson, Drake Deming, Jason H. Steffen, Gregory W. Henry, David Charbonneau

Information Systems and Engineering Management Research Publications

We present observations of six transits and six eclipses of the transiting planet system HD 189733 taken with the Spitzer Space Telescope's Infrared Array Camera (IRAC) at 8 μm, as well as a re-analysis of previously published data. We use several novel techniques in our data analysis, the most important of which is a new correction for the detector "ramp" variation with a double-exponential function, which performs better and is a better physical model for this detector variation. Our main scientific findings are (1) an upper limit on the variability of the dayside planet flux of 2.7% (68% confidence); (2) …

Developing A Conceptual Model Of Virtual Organizations For Citizen Science, Andrea Wiggins, Kevin Crowston

Information Systems and Quantitative Analysis Faculty Publications

This paper develops an organisation design-oriented conceptual model of scientific knowledge production through citizen science virtual organisations. Citizen science is a form of organisation design for collaborative scientific research involving scientists and volunteers, for which internet-based modes of participation enable massive virtual collaboration by thousands of members of the public. The conceptual model provides an example of a theory development process and discusses its application to an exploratory study. The paper contributes a multi-level process model for organising investigation into the impact of design on this form of scientific knowledge production.

Assessment Of Submerged Vegetation As Indicators Of Irgarol Contamination, Melissa V. Fernandez

FIU Electronic Theses and Dissertations

Irgarol 1051 is a common antifoulant toxic to certain marine organisms. Submerged aquatic vegetation (SAV) are exposed to this herbicide when it leaches into the marine environment from painted structures, making SAVs ideal candidates to function as sentinel indicator of contamination. In the initial stage of this study, Coconut Grove and Key Largo Harbor were assessed for environmental exposure to Irgarol. Water, sediment and SAVs were collected, the latter two subject to automated solid phase extraction, and all samples analyzed by GC/MS-SIM for Irgarol and its metabolite, M1. Of the vegetation analyzed, Halodule and Syringodium had the highest capacity to …

Lorentz-Violating Gravitoelectromagnetism, Quentin G. Bailey

Physics & Astronomy - Prescott

The well-known analogy between a special limit of general relativity and electromagnetism is explored in the context of the Lorentz-violating standard-model extension. An analogy is developed for the minimal standard-model extension that connects a limit of the CPT-even component of the electromagnetic sector to the gravitational sector. We show that components of the post-Newtonian metric can be directly obtained from solutions to the electromagnetic sector. The method is illustrated with specific examples including static and rotating sources. Some unconventional effects that arise for Lorentz-violating electrostatics and magnetostatics have an analog in Lorentz-violating post-Newtonian gravity. In particular, we show that even …

Distributed Web Design, Christy Allen

Christy Allen

No abstract provided.

Correlations In Proton-Proton Collisions At The Lhc, The Cms Collaboration

Physics and Astronomy Publications and Other Works

Results on two-particle angular correlations for charged particles emitted in proton proton collisions at center-of-mass energies of 0.9, 2.36, and 7 TeV are presented, using data collected with the CMS detector over a broad range of pseudo-rapidity (h) and azimuthal angle (f). Short-range correlations in Dh, which are studied in minimum bias events, are characterized using a simple “independent cluster” parametrization in order to quantify their strength (cluster size) and their extent in h (cluster decay width). Long-range azimuthal correlations are studied differentially as a function of charged particle multiplicity and particle transverse momentum using a 980 nb^-1 data set …

The Roles Of Tidal Evolution And Evaporative Mass Loss In The Origin Of Corot-7 B, Brian Jackson, Neil Miller, Rory Barnes, Sean N. Raymond, Jonathan J. Fortney, Richard Greenberg

Brian Jackson

CoRoT-7 b is the first confirmed rocky exoplanet, but, with an orbital semimajor axis of 0.0172 au, its origins may be unlike any rocky planet in our Solar system. In this study, we consider the roles of tidal evolution and evaporative mass loss in CoRoT-7 b's history, which together have modified the planet's mass and orbit. If CoRoT-7 b has always been a rocky body, evaporation may have driven off almost half its original mass, but the mass loss may depend sensitively on the extent of tidal decay of its orbit. As tides caused CoRoT-7 b's orbit to decay, they …

Wavelet-Based Bayesian Estimation Of Partially Linear Regression Models With Long Memory Errors, Kyungduk Ko, Leming Qu, Marina Vannucci

Kyungduk Ko

In this paper we focus on partially linear regression models with long memory errors, and propose a wavelet-based Bayesian procedure that allows the simultaneous estimation of the model parameters and the nonparametric part of the model. Employing discrete wavelet transforms is crucial in order to simplify the dense variance-covariance matrix of the long memory error. We achieve a fully Bayesian inference by adopting a Metropolis algorithm within a Gibbs sampler. We evaluate the performances of the proposed method on simulated data. In addition, we present an application to Northern hemisphere temperature data, a benchmark in the long memory literature.

Synthesis Of Stratigraphies From Shallow-Water Sequences At Sites 871 Through 879 In The Western Pacific Ocean, Elisabetta Erba, Isabella Premoli Silva, Paul A. Wilson, Malcolm S. Pringle, William V. Sliter, David K. Watkins, Annie Arnaud Vanneau, Timothy J. Bralower, Ann F. Budd, Gilbert F. Camoin, Jean-Pierre Masse, Jörg Mutterlose, William W. Sager

Department of Earth and Atmospheric Sciences: Faculty Publications

This paper discusses the synthesis of bio-, magneto-, and isotope stratigraphies in the shallow-water sediment sequences drilled on guyots in the western Pacific Ocean during Leg 144. Material previously dredged from the slopes of a few guyots and the Cretaceous section recovered at Site 869 are also considered. The integrated stratigraphy along with radiometric ages resulted in the reconstruction of the geological events that produced atolls and guyots.

Crystallization Dynamics Of A Single Layer Complex Plasma, Angela Douglass, Peter Hartmann, Jorge C. Reyes, Lorin S. Matthews, Truell W. Hyde, Aniko Kovacs, Zoltan Donko

Articles

We report a series of complex (dusty) plasma experiments, aimed at the study of the detailed time evolution of the recrystallization process followinga rapid quench of a two-dimensional dust liquid. The experiments were accompanied by large-scale (million-particle) molecular dynamicssimulations, assuming Yukawa-type interparticle interaction. Both experiment and simulation show a ∝t(α) (power-law) dependence of the linear crystallite domain size as measured by the bond-order correlation length, translational correlation length, dislocation (defect) density, and adirect size measurement algorithm. The results show two stages of order formation. On short time scales, individual particle motion dominates; this is afast process …

A Hot Jupiter Orbiting The 1.7 M☉ Subgiant Hd 102956*, John Asher Johnson, Brendan P. Bowler, Andrew W. Howard, Gregory W. Henry, Geoffrey W. Marcy, Howard Isaacson, John Michael Brewer, Debra A. Fischer, Timothy D. Morton, Justin R. Crepp

Information Systems and Engineering Management Research Publications

We report the detection of a giant planet in a 6.4950 day orbit around the 1.68 M☉ subgiant HD 102956. The planet has a semimajor axis a = 0.081 AU and a minimum mass MPsin i =0.96 MJup. HD 102956 is the most massive star known to harbor a hot Jupiter, and its planet is only the third known to orbit within 0.6 AU of a star more massive than 1.5 M☉. Based on our sample of 137 subgiants with M⋆>1.45 M☉, we find that 0.5%–2.3% of A-type stars harbor a close-in planet (a < 0.1 AU) with MPsin i > 1 MJup, consistent with hot-Jupiter …

The California Planet Survey. I. Four New Giant Exoplanets*, Andrew W. Howard, John Asher Johnson, Geoffrey W. Marcy, Debra A. Fischer, Jason T. Wright, David Bernat, Gregory W. Henry, Kathryn M. G. Peek, Howard Isaacson, Kevin Apps, Michael Endl, William D. Cochran, Jeff A. Valenti, Jay Anderson, Nikolai E. Piskunov

Information Systems and Engineering Management Research Publications

We present precise Doppler measurements of four stars obtained during the past decade at Keck Observatory by the California Planet Survey (CPS). These stars, namely, HD 34445, HD 126614, HD 13931, and Gl 179, all show evidence for a single planet in Keplerian motion. We also present Doppler measurements from the Hobby-Eberly Telescope (HET) for two of the stars, HD 34445 and Gl 179, that confirm the Keck detections and significantly refine the orbital parameters. These planets add to the statistical properties of giant planets orbiting near or beyond the ice line, and merit follow-up by astrometry, imaging, and space-borne …

Recent Transits Of The Super-Earth Exoplanet Gj 1214b, Pedro V. Sada, Drake Deming, Brian Jackson, Donald E. Jennings, Steven W. Peterson, Flynn Haase, Kevin Bays, Eamon O'Gorman, Alan Lundsford

Brian Jackson

We report recent ground-based photometry of the transiting super-Earth exoplanet GJ 1214b at several wavelengths, including the infrared near 1.25 μm (J band). We observed a J-band transit with the FLAMINGOS infrared imager and the 2.1 m telescope on Kitt Peak, and we observed several optical transits using a 0.5 m telescope on Kitt Peak and the 0.36 m Universidad de Monterrey Observatory telescope. Our high-precision J-band observations exploit the brightness of the M dwarf host star at this infrared wavelength as compared with the optical and are significantly less affected by stellar activity and limb darkening. We fit the …

Application Of Convex Methods To Identification Of Fuzzy Subpopulations, Ryan Lee Eliason

Theses and Dissertations

In large observational studies, data are often highly multivariate with many discrete and continuous variables measured on each observational unit. One often derives subpopulations to facilitate analysis. Traditional approaches suggest modeling such subpopulations with a compilation of interaction effects. However, when many interaction effects define each subpopulation, it becomes easier to model membership in a subpopulation rather than numerous interactions. In many cases, subjects are not complete members of a subpopulation but rather partial members of multiple subpopulations. Grade of Membership scores preserve the integrity of this partial membership. By generalizing an analytic chemistry concept related to chromatography-mass spectrometry, we …

Collisional Dynamics Of The Cesium D1 And D2 Transitions, Greg A. Pitz

Theses and Dissertations

The collisional dynamics of the 6²P levels in cesium have been studied utilizing steady state laser absorption and laser induced florescence techniques. In addition the production of a blue beam produced by two photon absorption has been observed in potassium. The collisional broadening rate for cesium, λ_L, for He, Ne, Ar, Kr, Xe, N₂, H₂, HD, D₂, CH₄, C₂H₆, CF₄, and ³He are 24.13, 10.85, 18.31, 17.82, 19.74, 16.64, 20.81, 20.06, 18.04, 29.00, 26.70, 18.84, and 26.00 MHz/torr, respectively for the …

Veritas Search For Vhe Gamma-Ray Emission From Dwarf Spheroidal Galaxies, P. T. Reynolds, Et. Al.

Physical Sciences Publications

Indirect dark matter searches with ground-based gamma-ray observatories provide an alternative for identifying the particle nature of dark matter that is complementary to that of direct search or accelerator production experiments. We present the results of observations of the dwarf spheroidal galaxies Draco, Ursa Minor, Boötes 1, and Willman 1 conducted by the Very Energetic Radiation Imaging Telescope Array System (VERITAS). These galaxies are nearby dark matter dominated objects located at a typical distance of several tens of kiloparsecs for which there are good measurements of the dark matter density profile from stellar velocity measurements. Since the conventional astrophysical background …

Veritas Search For Vhe Gamma-Ray Emission From Dwarf Spheroidal Galaxies, V. A. Acciari, T. Arlen, T. Aune, M. Beilicke, W. Benbow, D. Boltuch, S. M. Bradbury, J. H. Buckley, V. Bugaev, K. Byrum, A. Cannon, A. Cesarini, Jodi L. Christiansen, L. Ciupik, W. Cui, R. Dickherber, C. Duke, J. P. Finley, G. Finnegan, A. Furniss, N. Galante, S. Godambe, J. Grube, R. Guenette, G. Gyuk, D. Hanna, J. Holder, C. M. Hui, T. B. Humensky, A. Imran, P. Kaaret, N. Karlsson, M. Kertzman, D. Kieda, A. Konopelko, H. Krawczynski, F. Krennrich, G. Maier, S. Mcarthur, A. Mccann, M. Mccutcheon, P. Moriarty, R. A. Ong, A. N. Otte, D. Pandel, J. S. Perkins, M. Pohl, J. Quinn, K. Ragan, L. C. Reyes, P. T. Reynolds, E. Roache, H. J. Rose, M. Schroedter, G. H. Sembroski, G. D. Senturk, A. W. Smith, D. Steele, S. P. Swordy, G. Tesic, M. Theiling, S. Thibadeau, A. Varlotta, V. V. Vassiliev, S. Vincent, R. G. Wagner, S. P. Wakely, J. E. Ward, T. C. Weekes, A. Weinstein, T. Weisgarber, D. A. Williams, S. Wissel, B. Zitzer

Physics

Indirect dark matter searches with ground-based gamma-ray observatories provide an alternative for identifying the particle nature of dark matter that is complementary to that of direct search or accelerator production experiments. We present the results of observations of the dwarf spheroidal galaxies Draco, Ursa Minor, Bootes 1, and Willman 1 conducted by the Very Energetic Radiation Imaging Telescope Array System (VERITAS). These galaxies are nearby dark matter dominated objects located at a typical distance of several tens of kiloparsecs for which there are good measurements of the dark matter density profile from stellar velocity measurements. Since the conventional astrophysical background …

Statistical Image Recovery From Laser Speckle Patterns With Polarization Diversity, Donald B. Dixon

Theses and Dissertations

This research extends the theory and understanding of the laser speckle imaging technique. This non-traditional imaging technique may be employed to improve space situational awareness and image deep space objects from a ground-based sensor system. The use of this technique is motivated by the ability to overcome aperture size limitations and the distortion effects from Earth’s atmosphere. Laser speckle imaging is a lensless, coherent method for forming two-dimensional images from their autocorrelation functions. Phase retrieval from autocorrelation data is an ill-posed problem where multiple solutions exist. This research introduces polarization diversity as a method for obtaining additional information so the …