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Imaging And Control Of Surface Magnetization Domains In A Magnetoelectric Antiferromagnet, Ning Wu, Xi He, Aleksander L. Wysocki, Uday Lanke, Takashi Komesu, Kirill D. Belashchenko, Christian Binek, Peter A. Dowben 2011 University of Nebraska-Lincoln

Imaging And Control Of Surface Magnetization Domains In A Magnetoelectric Antiferromagnet, Ning Wu, Xi He, Aleksander L. Wysocki, Uday Lanke, Takashi Komesu, Kirill D. Belashchenko, Christian Binek, Peter A. Dowben

Christian Binek Publications

We report the direct observation of surface magnetization domains of the magnetoelectric Cr2O3 using photoemission electron microscopy with magnetic circular dichroism contrast and magnetic force microscopy. The domain pattern is strongly affected by the applied electric field conditions. Zero-field cooling results in an equal representation of the two domain types, while electric-field cooling selects one dominant domain type. These observations confirm the existence of surface magnetization, required by symmetry in magnetoelectric antiferromagnets.


Lorentzian Sasaki-Einstein Metrics On Connected Sums Of S² X S³, Ralph R. Gomez 2011 Swarthmore College

Lorentzian Sasaki-Einstein Metrics On Connected Sums Of S² X S³, Ralph R. Gomez

Mathematics & Statistics Faculty Works

We settle completely an open problem formulated by Boyer and Galicki in [5] which asks whether or not # kS² x S³ are negative Sasakian manifolds for all k. As a consequence of the affirmative answer to this problem, there exists so-called Sasaki eta-Einstein and Lorentzian Sasaki-Einsteinmetrics on these five-manifolds for all k and moreover all of these can be realized as links of isolated hypersurface singularities defined by weighted homogenous polynomials. The key step is to construct infinitely many hypersurfaces in weighted projective space that contain branch divisors Delta = Sigma(i) (1 - 1/m(i)) D-i such that the D-i …


The Effect Of Zonally Asymmetric Ozone Heating On The Northern Hemisphere Winter Polar Stratosphere, J. P. McCormack, T. R. Nathan, E. C. Cordero 2011 University of California - Davis

The Effect Of Zonally Asymmetric Ozone Heating On The Northern Hemisphere Winter Polar Stratosphere, J. P. Mccormack, T. R. Nathan, E. C. Cordero

Eugene C. Cordero

[1] Previous modeling studies have found significant differences in winter extratropical stratospheric temperatures depending on the presence or absence of zonally asymmetric ozone heating (ZAOH), yet the physical mechanism causing these differences has not been fully explained. The present study describes the effect of ZAOH on the dynamics of the Northern Hemisphere extratropical stratosphere using an ensemble of free-running atmospheric general circulation model simulations over the 1 December - 31 March period. We find that the simulations including ZAOH produce a significantly warmer and weaker stratospheric polar vortex in mid-February due to more frequent major stratospheric sudden warmings compared to …


Deckard - A Tree-Based, Scalable, And Accurate Code Clone Detection Tool (Version 1.2.1), Lingxiao JIANG, Ghassan MISHERGHI, Zhendong SU, Glondu STEPHANE 2011 Singapore Management University

Deckard - A Tree-Based, Scalable, And Accurate Code Clone Detection Tool (Version 1.2.1), Lingxiao Jiang, Ghassan Misherghi, Zhendong Su, Glondu Stephane

SMU Research Data

Deckard is a tree-based, scalable, and accurate code clone detection tool. It is also capable of reporting clone-related bugs. For more information, pls refer to readme.txt. The latest version is available from Deckard repository on Github. https://github.com/skyhover/Deckard


Search For Gravitational Waves Associated With The August 2006 Timing Glitch Of The Vela Pulsar, J. Abadie, Marco Cavaglia, For full list of authors, see publisher's website. 2011 Missouri University of Science and Technology

Search For Gravitational Waves Associated With The August 2006 Timing Glitch Of The Vela Pulsar, J. Abadie, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.

Physics Faculty Research & Creative Works

The physical mechanisms responsible for pulsar timing glitches are thought to excite quasinormal mode oscillations in their parent neutron star that couple to gravitational-wave emission. In August 2006, a timing glitch was observed in the radio emission of PSR B0833-45, the Vela pulsar. At the time of the glitch, the two colocated Hanford gravitational-wave detectors of the Laser Interferometer Gravitational-wave observatory (LIGO) were operational and taking data as part of the fifth LIGO science run (S5). We present the first direct search for the gravitational-wave emission associated with oscillations of the fundamental quadrupole mode excited by a pulsar timing glitch. …


Medium Propagation Effects In High-Order Harmonic Generation Of Ar And N₂, Cheng Jin, Anh-Thu Le, C. D. Lin 2011 Missouri University of Science and Technology

Medium Propagation Effects In High-Order Harmonic Generation Of Ar And N₂, Cheng Jin, Anh-Thu Le, C. D. Lin

Physics Faculty Research & Creative Works

We report theoretical calculations of high-order harmonic generation (HHG) by intense infrared lasers in atomic and molecular targets taking into account the macroscopic propagation of both fundamental and harmonic fields. On the examples of Ar and N₂, we demonstrate that these ab initio calculations are capable of accurately reproducing available experimental results with isotropic and aligned target media. We further present detailed analysis of HHG intensity and phase under various experimental conditions, in particular, as the wavelength of the driving laser changes. Most importantly, our results strongly support the factorization of HHG at the macroscopic level into a product of …


Observation Of Strong Resonant Behavior In The Inverse Photoelectron Spectroscopy Of Ce Oxide, James G. Tobin, Sw Yu, Brandon W. Chung, George Daniel Waddill, Laurent Claudius Duda, Joseph S. Nordgren 2011 Missouri University of Science and Technology

Observation Of Strong Resonant Behavior In The Inverse Photoelectron Spectroscopy Of Ce Oxide, James G. Tobin, Sw Yu, Brandon W. Chung, George Daniel Waddill, Laurent Claudius Duda, Joseph S. Nordgren

Physics Faculty Research & Creative Works

X-ray emission spectroscopy and resonant inverse photoelectron spectroscopy (RIPES) have been used to investigate the photon emission associated with the Ce 3d5/2 and Ce 3d3/2 thresholds. Strong resonant behavior has been observed in the RIPES of a Ce oxide near the 5/2 and 3/2 edges.


Polarization Patterning By Laser-Induced Phase Change In Ferroelectric Polymer Films, Christina M. Othon, Stephen Ducharme 2011 University of Nebraska-Lincoln

Polarization Patterning By Laser-Induced Phase Change In Ferroelectric Polymer Films, Christina M. Othon, Stephen Ducharme

Stephen Ducharme Publications

Polarization patterns were written on ferroelectric poly(vinylidene- trifluoroethylene) copolymer Langmuir–Blodgett films by heating into the paraelectric phase by laser illumination using two methods. In the first method, patterns were produced by direct writing by a focused continuouswave laser beam that was moved across the sample. This method affords the greatest flexibility. In the second method, the patterns were generated simultaneously with a pulsed laser using a beam interference method. This method produces highly regular patterns quickly over large areas and affords higher patterning resolution. The patterns produced by both methods could be erased and rewritten, making this technique useful for …


Bounds For Solid Angles Of Lattices Of Rank Three, Lenny Fukshansky, Sinai Robins 2011 Claremont McKenna College

Bounds For Solid Angles Of Lattices Of Rank Three, Lenny Fukshansky, Sinai Robins

CMC Faculty Publications and Research

We find sharp absolute constants C1 and C2 with the following property: every well-rounded lattice of rank 3 in a Euclidean space has a minimal basis so that the solid angle spanned by these basis vectors lies in the interval [C1,C2]. In fact, we show that these absolute bounds hold for a larger class of lattices than just well-rounded, and the upper bound holds for all. We state a technical condition on the lattice that may prevent it from satisfying the absolute lower bound on the solid angle, in which case we …


Reciprocal Regulation Of Trek-1 Channels By Arachidonic Acid And Crh In Mouse Corticotropes, Andy K. Lee, James L. Smart, Marcelo Rubinstein, Malcolm J. Low, Amy Tse 2011 University of Alberta

Reciprocal Regulation Of Trek-1 Channels By Arachidonic Acid And Crh In Mouse Corticotropes, Andy K. Lee, James L. Smart, Marcelo Rubinstein, Malcolm J. Low, Amy Tse

Faculty Publications - Department of Biological & Molecular Science

Arachidonic acid (AA) is generated in the anterior pituitary gland upon stimulation by the ACTH secretagogue, CRH. Using the patch clamp technique,we examined the action of AA on the excitability of single pituitary corticotropes obtained from a transgenic mouse strain that expresses the enhanced green fluorescent protein driven by the proopiomelanocortin promoter. CRH evoked depolarization, but AA caused hyperpolarization. Under voltage clamp condition, AA caused a rapid inhibition of the delayed rectifier K current and then increased a background K current. Inhibition of AA metabolism did not prevent the activation of the K current by AA, suggesting a direct action …


Evaluation Of The Sensitivity Of Inventory And Monitoring National Parks To Nutrient Enrichment Effects From Atmospheric Nitrogen Deposition Northern Great Plains Network (Ngpn), T. J. Sullivan, T. C. McDonnell, G. T. McPherson, S. D. Mackey, D. Moore 2011 E&S Environmental Chemistry, Inc.

Evaluation Of The Sensitivity Of Inventory And Monitoring National Parks To Nutrient Enrichment Effects From Atmospheric Nitrogen Deposition Northern Great Plains Network (Ngpn), T. J. Sullivan, T. C. Mcdonnell, G. T. Mcpherson, S. D. Mackey, D. Moore

United States National Park Service: Publications

Northern Great Plains Network (NGPN)

National maps of atmospheric N emissions and deposition are provided in Maps A and B as context for subsequent network data presentations. Map A shows county level emissions of total N for the year 2002. Map B shows total N deposition, again for the year 2002.

There are three parks in the Northern Great Plains Network that are larger than 100 square miles: Badlands (BADL), Missouri (MNRR), and Theodore Roosevelt (THRO). In addition, there are 10 other smaller parks.

Total annual N emissions, by county, are shown in Map C for lands in and surrounding …


Mining Iterative Generators And Representative Rules For Software Specification Discovery, David LO, Jinyan LI, Limsoon WONG, Siau-Cheng KHOO 2011 Singapore Management University

Mining Iterative Generators And Representative Rules For Software Specification Discovery, David Lo, Jinyan Li, Limsoon Wong, Siau-Cheng Khoo

Research Collection School Of Computing and Information Systems

Billions of dollars are spent annually on software-related cost. It is estimated that up to 45 percent of software cost is due to the difficulty in understanding existing systems when performing maintenance tasks (i.e., adding features, removing bugs, etc.). One of the root causes is that software products often come with poor, incomplete, or even without any documented specifications. In an effort to improve program understanding, Lo et al. have proposed iterative pattern mining which outputs patterns that are repeated frequently within a program trace, or across multiple traces, or both. Frequent iterative patterns reflect frequent program behaviors that likely …


Polynomial Generalizations Of Two-Variable Ramanujan Type Identities, James McLaughlin, Andrew Sills 2011 West Chester University of Pennsylvania

Polynomial Generalizations Of Two-Variable Ramanujan Type Identities, James Mclaughlin, Andrew Sills

Department of Mathematical Sciences Faculty Publications

We provide finite analogs of a pair of two-variable q-series identities from Ramanujan's lost notebook and a companion identity.


Spectra Of Type Ii Cepheid Candidates And Related Stars, Edward G. Schmidt, Danielle Rogalla, Lauren Thacker-Lynn 2011 University of Nebraska at Lincoln

Spectra Of Type Ii Cepheid Candidates And Related Stars, Edward G. Schmidt, Danielle Rogalla, Lauren Thacker-Lynn

Edward Schmidt Publications

We present low-resolution spectra for variable stars in the Cepheid period range from the ROTSE-I Demonstration Project and the All Sky Automated Survey, some of which were previously identified as type II Cepheid candidates. We have derived effective temperatures, gravities, and metallicities from the spectra. Based on this, three types of variables were identified: Cepheid strip stars, cool stars that lie along the red subgiant and giant branch, and cool main-sequence stars. Many fewer type II Cepheids were found than expected and most have amplitudes less than 0.4 mag. The cool variables include many likely binaries as well as intrinsic …


Vector Space Language, Ronald Lovett 2011 Washington University in St. Louis

Vector Space Language, Ronald Lovett

Topics in Quantum Mechanics

No abstract provided.


Vertical Distribution Of Deep-Pelagic (0-3000 M) Fishes Over The Charlie-Gibbs Fracture Zone Region Of The Northern Mid-Atlantic Ridge, April B. Cook, Tracey Sutton, John K. Galbraith, M. Vecchione 2011 Virginia Institute of Marine Science

Vertical Distribution Of Deep-Pelagic (0-3000 M) Fishes Over The Charlie-Gibbs Fracture Zone Region Of The Northern Mid-Atlantic Ridge, April B. Cook, Tracey Sutton, John K. Galbraith, M. Vecchione

Marine & Environmental Sciences Faculty Proceedings, Presentations, Speeches, Lectures

Only a tiny fraction of the world’s largest volume of living space, the ocean’s midwater biome, has ever been sampled. As part of the International Census of Marine Life field project, MAR-ECO, a discrete-depth trawling survey was conducted in 2009 aboard the NOAA ship Henry B. Bigelow to examine pelagic assemblage structure and distribution over the Charlie-Gibbs Fracture Zone of the northern Mid-Atlantic Ridge. The bottom topography in this region ranges from 4500 m in the channel to 700-800 m on top of adjacent seamounts. Sampling was conducted at 11 stations from 0-3000 m using a Norwegian “Krill” trawl with …


Hayward And Henson Secure Nsf Grant For $350,000, Keri Suarez 2011 Andrews University

Hayward And Henson Secure Nsf Grant For $350,000, Keri Suarez

Lake Union Herald

No abstract provided.


Insights Into The High-Energy Gamma-Ray Emission Of Markarian 501 From Extensive Multifrequency Observations In The Fermi Era, P. T. Reynolds, Fermi-LAT, MAGIC, VERITAS 2011 Cork Institute of Technology

Insights Into The High-Energy Gamma-Ray Emission Of Markarian 501 From Extensive Multifrequency Observations In The Fermi Era, P. T. Reynolds, Fermi-Lat, Magic, Veritas

Physical Sciences Publications

We report on the γ-ray activity of the blazar Mrk 501 during the first 480 days of Fermi operation. We find that the average Large Area Telescope (LAT) γ-ray spectrum of Mrk 501 can be well described by a single power-law function with a photon index of 1.78 ± 0.03. While we observe relatively mild flux variations with the Fermi-LAT (within less than a factor of two), we detect remarkable spectral variability where the hardest observed spectral index within the LAT energy range is 1.52 ± 0.14, and the softest one is 2.51 ± 0.20. These unexpected spectral changes do …


Structural Evolution Of A Composite Middle To Lower Crustal Section: The Sierra De Pie De Palo, Northwest Argentina, Sean R. Mulcahy, S. M. Roeske, W. C. McClelland, F. Jourdan, A. Iriondo, P. R. Renne, J. D. Vervoort, G. I. Vujovich 2011 Western Washington University

Structural Evolution Of A Composite Middle To Lower Crustal Section: The Sierra De Pie De Palo, Northwest Argentina, Sean R. Mulcahy, S. M. Roeske, W. C. Mcclelland, F. Jourdan, A. Iriondo, P. R. Renne, J. D. Vervoort, G. I. Vujovich

Geology Faculty Publications

The Sierra de Pie de Palo of northwest Argentina preserves middle to lower crustal metamorphic rocks that were penetratively deformed during Ordovician accretion of the Precordillera terrane to the Gondwana margin. New structural, petrologic, and geochronologic data from a 40 km structural transect reveals that the Sierra de Pie de Palo preserves a middle to lower crustal ductile thrust complex consisting of individual structural units and not an intact ophiolite and cover sequence. Top-to-the-west thrusting occurred intermittently on discrete ductile shear zones from ∼515 to ∼417 Ma and generally propagated toward the foreland with progressive deformation. Ordovician crustal shortening and …


Location And Scale Estimation With Correlation Coefficients, Rudy Gideon, Adele Marie Rothan 2011 University of Montana, Missoula

Location And Scale Estimation With Correlation Coefficients, Rudy Gideon, Adele Marie Rothan

Mathematical Sciences Faculty Publications

This article shows how to use any correlation coefficient to produce an estimate of location and scale. It is part of a broader system, called a correlation estimation system (CES), that uses correlation coefficients as the starting point for estimations. The method is illustrated using the well-known normal distribution. This article shows that any correlation coefficient can be used to fit a simple linear regression line to bivariate data and then the slope and intercept are estimates of standard deviation and location. Because a robust correlation will produce robust estimates, this CES can be recommended as a tool for everyday …


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