Understanding The Surface Induced Phosphorylation Of Prebiotic Molecules By Schreibersite,
2016
Kennesaw State University
Understanding The Surface Induced Phosphorylation Of Prebiotic Molecules By Schreibersite, Danna Qasim
Master of Science in Chemical Sciences Theses
The study of the surface of a meteoritic mineral, schreibersite (Fe,Ni)3P, was investigated to provide insight into the role of the mineral’s surface in aqueous-phase phosphorylation reactions. The optimization of a custom-designed ultrahigh vacuum (UHV) apparatus and Fe2NiP (schreibersite) surface was performed to permit surface science analysis. The bare surface was characterized by scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS), which showed some oxidation and segregation of phosphorous within the near-surface region. The interaction and/or reaction of water (H2O), methanol (CH3OH), formic acid …
Tev Gamma-Ray Observations Of The Galactic Center Ridge By Veritas,
2016
Department of Physical Sciences, Cork Institute of Technology, Bishopstown, Cork, Ireland
Tev Gamma-Ray Observations Of The Galactic Center Ridge By Veritas, P. T. Reynolds, Et Al
Physical Sciences Publications
The Galactic Center ridge has been observed extensively in the past by both GeV and TeV gamma-ray instruments revealing a wealth of structure, including a diffuse component and the point sources G0.9+0.1 (a composite supernova remnant) and Sgr A* (believed to be associated with the supermassive black hole located at the center of our Galaxy). Previous very high energy (VHE) gamma-ray observations with the H.E.S.S. experiment have also detected an extended TeV gamma-ray component along the Galactic plane in the >300 GeV gamma-ray regime. Here we report on observations of the Galactic Center ridge from 2010 to 2014 by the …
Hallmarks Of The Mott-Metal Crossover In The Hole-Doped Pseudospin-1/2 Mott Insulator Sr2Iro4,
2016
University of Colorado - Boulder
Hallmarks Of The Mott-Metal Crossover In The Hole-Doped Pseudospin-1/2 Mott Insulator Sr2Iro4, Yue Cao, Qiang Wang, Justin A. Waugh, Theodore J. Reber, Haoxiang Li, Xiaoqing Zhou, Stephen Parham, S. -R. Park, Nicholas C. Plumb, Eli Rotenberg, Aaron Bostwick, Jonathan D. Denlinger, Tongfei Qi, Michael A. Hermele, Gang Cao, Daniel S. Dessau
Physics and Astronomy Faculty Publications
The physics of doped Mott insulators remains controversial after decades of active research, hindered by the interplay among competing orders and fluctuations. It is thus highly desired to distinguish the intrinsic characters of the Mott-metal crossover from those of other origins. Here we investigate the evolution of electronic structure and dynamics of the hole-doped pseudospin-1/2 Mott insulator Sr2IrO4. The effective hole doping is achieved by replacing Ir with Rh atoms, with the chemical potential immediately jumping to or near the top of the lower Hubbard band. The doped iridates exhibit multiple iconic low-energy features previously observed …
Tev Gamma-Ray Observations Of The Galactic Center Ridge By Veritas,
2016
Cork Institute of Technology
Tev Gamma-Ray Observations Of The Galactic Center Ridge By Veritas, P. T. Reynolds, Et. Al.
Physical Sciences Publications
The Galactic Center ridge has been observed extensively in the past by both GeV and TeV gamma-ray instruments revealing a wealth of structure, including a diffuse component and the point sources G0.9+0.1 (a composite supernova remnant) and Sgr A* (believed to be associated with the supermassive black hole located at the center of our Galaxy). Previous very high energy (VHE) gamma-ray observations with the H.E.S.S. experiment have also detected an extended TeV gamma-ray component along the Galactic plane in the >300 GeV gamma-ray regime. Here we report on observations of the Galactic Center ridge from 2010 to 2014 by the …
X-Ray Observations Of Bow Shocks Around Runaway O Stars. The Case Of Ζ Oph And Bd+43°3654,
2016
IAA-CSIC
X-Ray Observations Of Bow Shocks Around Runaway O Stars. The Case Of Ζ Oph And Bd+43°3654, Jesus Toala, Lidia M. Oskinova, A. González-Galán, M. A. Guerrero, Richard Ignace, M. Pohl
ETSU Faculty Works
Non-thermal radiation has been predicted within bow shocks around runaway stars by recent theoretical works. We present X-ray observations toward the runaway stars ζ Oph by Chandra and Suzaku and of BD+43°3654 by XMM-Newton to search for the presence of non-thermal X-ray emission. We found no evidence of non-thermal emission spatially coincident with the bow shocks; nonetheless, diffuse emission was detected in the vicinity of ζ Oph. After a careful analysis of its spectral characteristics, we conclude that this emission has a thermal nature with a plasma temperature of T ≈ 2 × 106 K. The cometary shape of this …
H, He-Like Recombination Spectra – I. L-Changing Collisions For Hydrogen,
2016
University of Kentucky
H, He-Like Recombination Spectra – I. L-Changing Collisions For Hydrogen, Francisco Guzmán, N. R. Badnell, R. J. R. Williams, P. A. M. Van Hoof, Marios Chatzikos, Gary J. Ferland
Physics and Astronomy Faculty Publications
Hydrogen and helium emission lines in nebulae form by radiative recombination. This is a simple process which, in principle, can be described to very high precision. Ratios of He I and H I emission lines can be used to measure the He+/H+ abundance ratio to the same precision as the recombination rate coefficients. This paper investigates the controversy over the correct theory to describe dipole l-changing collisions (nl → nl′ = l ± 1) between energy-degenerate states within an n-shell. The work of Pengelly & Seaton has, for half-a-century, been considered the definitive …
Evidence For Reflected Light From The Most Eccentric Exoplanet Known,
2016
San Francisco State University
Evidence For Reflected Light From The Most Eccentric Exoplanet Known, Stephen R. Kane, Robert A. Wittenmyer, Natalie R. Hinkel, Arpita Roy, Suvrath Mahadevan, Diana Dragomir, Jaymie M. Matthews, Gregory W. Henry, Abhijit Chakraborty, Tabetha S. Boyajian
Information Systems and Engineering Management Research Publications
Planets in highly eccentric orbits form a class of objects not seen within our solar system. The most extreme case known among these objects is the planet orbiting HD 20782, with an orbital period of 597 days and an eccentricity of 0.96. Here we present new data and analysis for this system as part of the Transit Ephemeris Refinement and Monitoring Survey. We obtained CHIRON spectra to perform an independent estimation of the fundamental stellar parameters. New radial velocities from Anglo-Australian Telescope and PARAS observations during periastron passage greatly improve our knowledge of the eccentric nature of the orbit. The …
Nuclear Effects In The Deuteron And Global Pdf Fits,
2016
University of South Carolina
Nuclear Effects In The Deuteron And Global Pdf Fits, S. I. Alekhin, S. A. Kulagin, Roberto Petti
Faculty Publications
We present a detailed study of nuclear corrections in the deuteron (D) from an analysis of data from charged-lepton deep-inelastic scattering (DIS) off proton and D, as well as from dimuon pair production in pp and pD collisions and W± and the Z boson production at pp (p¯p) colliders. In particular, we discuss the determination of the off-shell function describing the modification of parton distributions (PDF) in bound nucleons in the context of global PDF fits. Our results are consistent with the ones obtained earlier from the study of the ratios of DIS structure functions A 2 / F …
Double Power Laws In The Event-Integrated Solar Energetic Particle Spectrum,
2016
Florida Institute of Technology
Double Power Laws In The Event-Integrated Solar Energetic Particle Spectrum, Lulu Zhao, Ming Zhang, Hamid K. Rassoul
Aerospace, Physics, and Space Science Faculty Publications
A double power law or a power law with exponential rollover at a few to tens of MeV nucleon−1 of the eventintegrated differential spectra has been reported in many solar energetic particle (SEP) events. The rollover energies per nucleon of different elements correlate with a particleʼs charge-to-mass ratio (Q/A). The probable causes are suggested as residing in shock finite lifetimes, shock finite sizes, shock geometry, and an adiabatic cooling effect. In this work, we conduct a numerical simulation to investigate a particleʼs transport process in the inner heliosphere. We solve the focused transport equation using a time-backward Markov stochastic approach. …
Efficient Geometric Probabilities Of Multi-Transiting Exoplanetary Systems From Corbits,
2016
Carnegie Mellon University
Efficient Geometric Probabilities Of Multi-Transiting Exoplanetary Systems From Corbits, Joshua Brakensiek, Darin Ragozzine
Aerospace, Physics, and Space Science Faculty Publications
NASA’s Kepler Space Telescope has successfully discovered thousands of exoplanet candidates using the transit method, including hundreds of stars with multiple transiting planets. In order to estimate the frequency of these valuable systems, it is essential to account for the unique geometric probabilities of detecting multiple transiting extrasolar planets around the same parent star. In order to improve on previous studies that used numerical methods, we have constructed an efficient, semi-analytical algorithm called the Computed Occurrence of Revolving Bodies for the Investigation of Transiting Systems (CORBITS), which, given a collection of conjectured exoplanets orbiting a star, computes the probability that …
New Discoveries From The Arecibo 327 Mhz Drift Pulsar Survey Radio Transient Search,
2016
The University of Texas Rio Grande Valley
New Discoveries From The Arecibo 327 Mhz Drift Pulsar Survey Radio Transient Search, J. S. Deneva, Kevin Stovall, M. A. Mclaughlin, M. Bagchi, S. D. Bates, P. C.C. Freire, Jose Guadalupe Martinez, Fredrick Jenet
Physics & Astronomy Faculty Publications
We present Clusterrank, a new algorithm for identifying dispersed astrophysical pulses. Such pulses are commonly detected from Galactic pulsars and rotating radio transients (RRATs), which are neutron stars with sporadic radio emission. More recently, isolated, highly dispersed pulses dubbed fast radio bursts (FRBs) have been identified as the potential signature of an extragalactic cataclysmic radio source distinct from pulsars and RRATs. Clusterrank helped us discover 14 pulsars and 8 RRATs in data from the Arecibo 327 MHz Drift Pulsar Survey (AO327). The new RRATs have DMs in the range 23.5-86.6 pc cm-3 and periods in the range 0.172-3.901 s. The …
The Nanograv Nine-Year Data Set: Limits On The Isotropic Stochastic Gravitational Wave Background,
2016
The University of Texas Rio Grande Valley
The Nanograv Nine-Year Data Set: Limits On The Isotropic Stochastic Gravitational Wave Background, Z. Arzoumanian, A. Brazier, S. Burke-Spolaor, S. J. Chamberlin, S. Chatterjee, B. Christy, J. M. Cordes, N. J. Cornish, Fredrick A. Jenet, Jing Luo
Physics & Astronomy Faculty Publications
We compute upper limits on the nanohertz-frequency isotropic stochastic gravitational wave background (GWB) using the 9 year data set from the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) collaboration. Well-tested Bayesian techniques are used to set upper limits on the dimensionless strain amplitude (at a frequency of 1 yr-1) for a GWB from supermassive black hole binaries of Agw < 1.5 × 10-15. We also parameterize the GWB spectrum with a broken power-law model by placing priors on the strain amplitude derived from simulations of Sesana and McWilliams et al. Using Bayesian model selection we find that the data favor a broken power law to a pure power law with odds ratios of 2.2 and 22 to one for the Sesana and McWilliams prior models, respectively. Using the broken power-law analysis we construct posterior distributions on environmental factors that drive the binary to the GW-driven regime including the stellar mass density for stellar-scattering, mass accretion rate for circumbinary disk interaction, and orbital eccentricity for eccentric binaries, marking the first time that the shape of the GWB spectrum has been used to make astrophysical inferences. Returning to a power-law model, we place stringent limits on the energy density of relic GWs, Ωgw(f)h2 < 4.2 × 10-10. Our limit on the cosmic string GWB, Ωgw(f)h2 < 2.2 × 10-10, translates to a conservative limit on the cosmic string tension with Gμ < 3.3 × 10-8, a factor of four better than the joint Planck and high-l cosmic microwave background data from other experiments.
Better Together,
2016
DePaul University
Better Together
DePaul Magazine
Faculty have taken full advantage of the university's innovative intercollegiate grant program, and the resulting research is as interesting and diverse as the collaborators themselves. What is resulting is research on "Patient and Primary Care Provider Perspectives on Recreational and Therapeutic Cannabis Use Within a Changing Socioculltural and Political Context;" a new minor in climate change science and policy; a new class, Communication, Coding and Entrepreneurship; brain inflammation research; and the project "Cosmology Meets Continental Philosophy: Natural Laws and Why There Is Something Rather Than Nothing"
Ion Transport Through Macrocapillaries – Oscillations Due To Charge Patch Formation,
2016
Clemson University
Ion Transport Through Macrocapillaries – Oscillations Due To Charge Patch Formation, Dhruva Kulkarni, L.A.M. Lyle, Chad E. Sosolik
Publications
We present results on ion transport through large bore capillaries (macrocapillaries) that probe both the geometric and ion-guided aspects of this ion delivery mechanism. We have demonstrated that guiding in macrocapillaries exhibits position- and angle-dependent transmission properties which are directly related to the capillary material (either metal or insulator) and geometry. Specifically, we have passed 1 keV Rb+ ions through glass and metal macrocapillaries, and have observed oscillations for the transmitted ion current passing through the insulating capillaries. Straightforward calculations show that these oscillations can be attributed to beam deflections from charge patches that form on the interior walls …
Section Abstracts: Astronomy, Mathematics And Physics,
2016
Old Dominion University
Section Abstracts: Astronomy, Mathematics And Physics
Virginia Journal of Science
Abstracts of the Astronomy, Mathematics, and Physics Section for the 94th Annual Virginia Academy of Science Meeting, May 18-20, 2016, at University of Mary Washington, Fredericksburg, VA.
Atmospheric Circulation Of A Nine-Hot-Jupiter Sample: Probing Circulation And Chemistry Over A Wide Phase Space,
2016
University of Exeter
Atmospheric Circulation Of A Nine-Hot-Jupiter Sample: Probing Circulation And Chemistry Over A Wide Phase Space, Tiffany Kataria, David K. Sing, Nikole K. Lewis, Channon Visscher, Adam P. Showman, Jonathan J. Fortney, Mark S. Marley
Faculty Work Comprehensive List
We present results from an atmospheric circulation study of nine hot Jupiters that comprise a large transmission spectral survey using the Hubble and Spitzer Space Telescopes. These observations ex-hibit a range of spectral behavior over optical and infrared wavelengths which suggest diverse cloud and haze properties in their atmospheres. By utilizing the specific system parameters for each planet, we naturally probe a wide phase space in planet radius, gravity, orbital period, and equilibrium tem-perature. First, we show that our model “grid” recovers trends shown in traditional parametric studies of hot Jupiters, particularly equatorial superrotation and increased day-night temperature contrast with …
Nucleon Pdf Separation With The Collider And Fixed-Target Data,
2016
University of South Carolina
Nucleon Pdf Separation With The Collider And Fixed-Target Data, Sergey Alekhin, Johannes Blümlein, Kristin Lohwasser, Lea Michaela Caminada, Katerina Lipka, Ringaile Plačakytė, Sven-Olaf Moch, Roberto Petti
Faculty Publications
We consider the impact of the recent data obtained by the LHC, Tevatron, and fixed-target experiments on the nucleon quark distributions with a particular focus on disentangling different quark species. An improved determination of the poorly known strange sea distribution is obtained due to including data from the neutrino-induced deep-inelastic scattering experiments NOMAD and CHORUS. The impact of the associated (W + c) production data by CMS and ATLAS on the strange sea determination is also studied and a comparison with earlier results based on the collider data is discussed. Finally, the recent LHC and Tevatron data on …
Conducting Laalo3/Srtio3 Heterointerfaces On Atomically-Flat Substrates Prepared By Deionized-Water,
2016
University of Kentucky
Conducting Laalo3/Srtio3 Heterointerfaces On Atomically-Flat Substrates Prepared By Deionized-Water, John G. Connell, J. Nichols, John H. Gruenewald, D. -W. Kim, Sung S. Ambrose Seo
Physics and Astronomy Faculty Publications
We have investigated how the recently-developed water-leaching method for atomically-flat SrTiO3 (STO) substrates affects the transport properties of LaAlO3 (LAO) and STO heterointerfaces. Using pulsed laser deposition at identical growth conditions, we have synthesized epitaxial LAO thin-films on two different STO substrates, which are prepared by water-leaching and buffered hydrofluoric acid (BHF) etching methods. The structural, transport, and optical properties of LAO/STO heterostructures grown on water-leached substrates show the same high-quality as the samples grown on BHF-etched substrates. These results indicate that the water-leaching method can be used to grow complex oxide heterostructures with atomically well-defined heterointerfaces without …
The Parallelization And Optimization Of The N-Body Problem Using Openmp And Openmpi,
2016
Gettysburg College
The Parallelization And Optimization Of The N-Body Problem Using Openmp And Openmpi, Nicholas J. Carugati
Student Publications
The focus of this research is exploring the efficient ways we can implement the NBody problem. The N-Body problem, in the field of physics, is a problem in which predicts or simulates the movements of planets and how they interact with each other gravitationally. For this research, we are viewing if the simulation can execute efficiently by delegating the heavy computational work through different cores of a CPU. The approach that is being used to figure this out is by integrating the parallelization API OpenMP and the message-passing library OpenMPI into the code. Rather than all the code executing on …
Tadpole Orbits In The L4/L5 Region: Construction And Links To Other Families Of Periodic Orbits,
2016
Purdue University
Tadpole Orbits In The L4/L5 Region: Construction And Links To Other Families Of Periodic Orbits, Alexandre G. Van Anderlecht
Open Access Theses
The equations of motion in the Circular Restricted Three-Body Problem (CR3BP) allow five equilibrium solutions, that is, the Lagrange or libration points. Two of the five equilibrium solutions are the triangular or equilateral libration points, L4 and L 5. As the secondary gravitational body moves in its orbit about the larger mass, L4 and L5 lead and trail the secondary by 60 degrees, respectively. This investigation focuses on periodic solutions in the vicinity of the triangular libration points, specifically horseshoe and tadpole orbits. Horseshoe orbits are symmetric periodic solutions in the plane of primary motion encompassing both …
