Two-Dimensional Folding Technique For Enhancing Fermi Surface Signatures In The Momentum Density: Application To Compton Scattering Data From An Al-3 At. % Li Disordered Alloy,
2012
The Graduate University for Advanced Studies, Japan
Two-Dimensional Folding Technique For Enhancing Fermi Surface Signatures In The Momentum Density: Application To Compton Scattering Data From An Al-3 At. % Li Disordered Alloy, I. Matsumoto, J. Kwiatkowska, F. Maniawski, M. Itou, H. Kawata, N. Shiotani, S. Kaprzyk, P. E. Mijnarends, B. Barbiellini, A. Bansil
Arun Bansil
We present a technique for enhancing Fermi surface (FS) signatures in the two-dimensional (2D) distribution obtained after the 3D momentum density in a crystal is projected along a specific direction in momentum space. These results are usEFul for investigating fermiology via high-resolution Compton scattering and positron annihilation spectroscopies. We focus on the particular case of the (110) projection in a fcc crystal where the standard approach based on the use of the Lock-Crisp-West (LCW) folding theorem fails to give a clear FS image due to the strong overlap with FS images obtained through projection from higher Brillouin zones. We show …
Compton Profiles For Polycrystalline Cuxni1-X Alloys: Theory And Experiment,
2012
Argonne National Laboratory
Compton Profiles For Polycrystalline Cuxni1-X Alloys: Theory And Experiment, R. Benedek, R. Prasad, S. Manninen, B. Sharma, A. Bansil, P. Mijnarends
Arun Bansil
We present experimental and theoretical Compton profiles, J(q), for a series of CuₓNi₁₋ₓ alloys. This is the first comprehensive study of Compton profiles in an alloy system. The experiments were carried out using 60-keV γ rays on five polycrystalline alloy samples with Cu concentrations x=0.40,0.50,0.55,0.60,0.65 and on pure Cu and pure Ni. Our computations of J(q) are based on the Korringa-Kohn-Rostoker coherent-potential approximation scheme for treating the average electronic spectrum of the alloy. The theory reproduces the main features of the observed Compton profiles. The experimental Compton profiles show a nearly linear dependence on concentration while the theoretically predicted Compton …
Acoustic Plasmons And Doping Evolution Of Mott Physics In Resonant Inelastic X-Ray Scattering From Cuprate Superconductors,
2012
Northeastern University
Acoustic Plasmons And Doping Evolution Of Mott Physics In Resonant Inelastic X-Ray Scattering From Cuprate Superconductors, R. S. Markiewicz, M. Z. Hasan, A. Bansil
Arun Bansil
By incorporating a long-range Coulomb interaction into the framework of the one-band Hubbard model, we delineate how the low-energy plasmon around 1 eV, which is a universal feature of the charge dynamics of the cuprates, manifests itself in the resonant inelastic x-ray scattering (RIXS) spectra. The long-range Coulomb interaction in the doped system controls the form of the intraband RIXS dispersion near the Brillouin zone center around the Γ point. The out-of-plane momentum transfer component qz is found to play a key role in determining whether or not the RIXS spectrum shows a plasmon-related gap at Γ.
Micrometeoroid From Misse Examined To Understand The Effects Of The Space Environment On Space Suit,
2012
Utah State University
Micrometeoroid From Misse Examined To Understand The Effects Of The Space Environment On Space Suit, Kelby Peterson, Jr Dennison
Presentations
No abstract provided.
Expression Of Generalized Newton Iteration Method Via Generalized Local Fractional Taylor Series,
2012
China University of Mining & Technology
Expression Of Generalized Newton Iteration Method Via Generalized Local Fractional Taylor Series, Yang Xiao-Jun
Xiao-Jun Yang
Local fractional derivative and integrals are revealed as one of useful tools to deal with everywhere continuous but nowhere differentiable functions in fractal areas ranging from fundamental science to engineering. In this paper, a generalized Newton iteration method derived from the generalized local fractional Taylor series with the local fractional derivatives is reviewed. Operators on real line numbers on a fractal space are induced from Cantor set to fractional set. Existence for a generalized fixed point on generalized metric spaces may take place.
Micrometeoroids From Misse Examined To Understand The Effects Of The Space Environment On Space Suit Materials,
2012
Utah State University
Micrometeoroids From Misse Examined To Understand The Effects Of The Space Environment On Space Suit Materials, John R. Dennison
All Physics Faculty Presentations
Samples that were part of the Materials International Space Station Experiment (MISSE) experienced varying effects whilst exposed to the space environment; perhaps the most intriguing effect was the crater created by a micrometeoroid impact into a thin film of Vapor Deposited Aluminum (VDA) coated Mylar. Approximately 180 samples of various materials used in space-component design were flown on MISSE-6 and spent 18 months suspended off the side of the International Space Station. The Utah State University SUSpECS project was a unique student experiment that allowed for pre- and post-flight analysis of these material samples which were returned in pristine condition …
The Effects Of Space Environment On Wireless Communication Devices' Performance,
2012
Utah State University
The Effects Of Space Environment On Wireless Communication Devices' Performance, Hillyard Landon, Jr Dennison
Posters
This project evaluates the effects of the space environment on small radio hardware devices called Bluetooth (a proprietary open wireless technology standard for exchanging data over short distances) chips (hoovers). When electronics are exposed to the harsh environment outside the Earth's atmosphere, they sometimes do not perform as expected. The USU Getaway Away Special (GAS) team is now in the design stages of launching a CubeSat (a 10 cm cubed autonomous satellite to fly in Low Earth Orbit). In order to conduct experiments proposed for the USU GAS Cubesat, Bluetooth wireless communication will be used. By testing commercially available hardware …
Simulation Chamber For Space Environment Survivability Testing,
2012
Space Dynamics Laboratory, Utah State Univeristy
Simulation Chamber For Space Environment Survivability Testing, Lisa Montierth, Robert H. Johnson, Jr Dennison, James S. Dyer
Presentations
No abstract provided.
Electric Field Dependence Of The Time To Electrostatic Breakdown In Insulating Polymers,
2012
Utah State University
Electric Field Dependence Of The Time To Electrostatic Breakdown In Insulating Polymers, Charles Sim, Alec Sim, Jr Dennison
Presentations
No abstract provided.
The Effect Of Space Environment On Wireless Communication Devices' Performance,
2012
Utah State University
The Effect Of Space Environment On Wireless Communication Devices' Performance, Landon Hillyard, Jr Dennison
Presentations
No abstract provided.
Reflections On The Forum At Forty,
2012
California Polytechnic State University - San Luis Obispo
Section Abstracts: Astronomy, Mathematics And Physics With Materials Science,
2012
Old Dominion University
Section Abstracts: Astronomy, Mathematics And Physics With Materials Science
Virginia Journal of Science
Abstracts of the Astronomy, Mathematics, and Physics with Material Science Section for the 90th Annual Meeting of the Virginia Academy of Science, May 23-25, 2012, Norfolk State University, Norfolk, Virginia
Dynamic Reorganization Of Eg5 In The Mammalian Spindle Throughout Mitosis Requires Dynein And Tpx2,
2012
University of Massachusetts - Amherst
Dynamic Reorganization Of Eg5 In The Mammalian Spindle Throughout Mitosis Requires Dynein And Tpx2, Alyssa Gable, Minhua Qui, Janel Titus, Sai Balchand, Nick P. Ferenz, Nan Ma, Elizabeth S. Collins, Carey Fagersrom, Jennifer Ross, Ge Yang, Patricia Wadsworth
Jennifer Ross
Kinesin-5 is an essential mitotic motor. However, how its spatial–temporal distribution is regulated in mitosis remains poorly understood. We expressed localization and affinity purification–tagged Eg5 from a mouse bacterial artificial chromosome (this construct was called mEg5) and found its distribution to be tightly regulated throughout mitosis. Fluorescence recovery after photobleaching analysis showed rapid Eg5 turnover throughout mitosis, which cannot be accounted for by microtubule turnover. Total internal reflection fluorescence microscopy and high-resolution, single-particle tracking revealed that mEg5 punctae on both astral and midzone microtubules rapidly bind and unbind. mEg5 punctae on midzone microtubules moved transiently both toward and away from …
The Impacts Of Molecular Motor Traffic Jams,
2012
University of Massachusetts - Amherst
The Impacts Of Molecular Motor Traffic Jams, Jennifer Ross
Jennifer Ross
Much of a modern person's day is spent trying to get from point A to point B. So, too, in the cell, much time and energy is expended on shuttling organelles, protein complexes, and mRNA, called “cargos,” from point A to point B. We know that vehicle traffic slows down when roads get jammed with high-volume congestion. The traffic analogy begs the question: Do cellular highways get jammed? This is the question being probed by Leduc et al. in PNAS (1). Efficient cellular transport is made along “cellular highways” in the form of a cytoskeletal network of proteinacous filaments called …
Hrc Enews — 2012 Spring,
2012
University of Nevada, Las Vegas
Hrc Enews — 2012 Spring, Megan M. Iudice
Publications (HRC)
This issue contains staff accomplishments and announcements, event listings, and a "new faces" listing for new staff, affiliates, and researchers.
High-Frequency Ultrasound M-Mode Imaging For Identifying Lesion And Bubble Activity During High-Intensity Focused Ultrasound Ablation,
2012
University of Michigan-Ann Arbor
High-Frequency Ultrasound M-Mode Imaging For Identifying Lesion And Bubble Activity During High-Intensity Focused Ultrasound Ablation, Ronald Kumon, Madhu Sudhan Reddy Gudur, Yun Zhou
Physics Publications
Effective real-time monitoring of high-intensity focused ultrasound (HIFU) ablation is important for application of HIFU technology in interventional electrophysiology. This study investigated rapid, high-frequency M-mode ultrasound imaging for monitoring spatiotemporal changes during HIFU application. HIFU (4.33 MHz, 1 kHz PRF, 50% duty cycle, 1 s, 2600 – 6100 W/cm2 ) was applied to ex-vivo porcine cardiac tissue specimens with a confocally and perpendicularly aligned high-frequency imaging system (Visualsonics Vevo 770, 55 MHz center frequency). Radiofrequency (RF) data from M-mode imaging (1 kHz PRF, 2 s × 7 mm) was acquired before, during, and after HIFU treatment (n = 12). Among …
Mid-Infrared Upconversion Spectroscopy Based On A Yb:Fiber Femtosecond Laser,
2012
College of Saint Benedict/Saint John's University
Mid-Infrared Upconversion Spectroscopy Based On A Yb:Fiber Femtosecond Laser, Todd Johnson, Scott A. Diddams
Physics Faculty Publications
We present a system for molecular spectroscopy using a broadband mid-infrared laser with near-infrared detection. Difference frequency generation of a Yb:fiber femtosecond laser produced a mid-infrared (MIR) source tunable from 2100–3700 cm-1 (2.7–4.7 μm) with average power up to 40 mW. The MIR spectrum was upconverted to near-infrared wavelengths for broadband detection using a two-dimensional dispersion imaging technique. Absorption measurements were performed over bandwidths of 240 cm-1 (7.2 THz) with 0.048 cm-1 (1.4 GHz) resolution, and absolute frequency scale uncertainty was better than 0.005 cm-1 (150 MHz). The minimum detectable absorption coefficient per spectral element was …
The Variation Of Hydrogen Concentration In Ni/Mgh Thin Film With Temperature,
2012
Western Michigan University
The Variation Of Hydrogen Concentration In Ni/Mgh Thin Film With Temperature, Rex Nyadaufe Taibu
Masters Theses
The thermal stability of Ni/MgH thin film deposited on Si substrate by Unbalanced Magnetron Physical Vapor Deposition has been investigated using Ion Beam analysis (DBA) techniques. Rutherford Backscattering Spectrometry (RBS) and Non-Rutherford Backscattering Spectrometry (NRBS) have been used to find the composition of Magnesium, Nickel and Oxygen. Elastic Recoil Detection Analysis (ERDA) has been used to determine the concentration of hydrogen at each level of heating. Heating was done in the Ultra High Vacuum (UHV) environment using a non gassy button heater. Ni/MgH sample had lost most of its hydrogen after being heated to a temperature of about 125°C in …
Electronic Properties Of Layered Multicomponent Wide-Band-Gap Oxides: A Combinatorial Approach,
2012
Missouri University of Science and Technology
Electronic Properties Of Layered Multicomponent Wide-Band-Gap Oxides: A Combinatorial Approach, Altynbek Murat, Julia E. Medvedeva
Physics Faculty Research & Creative Works
The structural, electronic, and optical properties of 12 multicomponent oxides with layered structure RAMO 4, where R3 + = In or Sc, A3 + = Al or Ga, and M2 + = Ca, Cd, Mg, or Zn, are investigated using first-principles density functional approach. The compositional complexity of RAMO 4 leads to a wide range of band-gap values varying from 2.45 eV for InGaCdO 4 to 6.29 eV for ScAlMgO 4 as obtained from our self-consistent screened-exchange local density approximation calculations. Strikingly, despite the different band gaps in the oxide constituents, namely, 2-4 eV in CdO, In 2O …
Kinetic Studies Of The Photo-Degradation Of Poly Arylene Vinylenes,
2012
Technological University Dublin
Kinetic Studies Of The Photo-Degradation Of Poly Arylene Vinylenes, Luke O'Neill, Patrick Lynch, Niamh Mcgoldrick, Hugh Byrne, Mary Mcnamara
Articles
The kinetics of the degradation of a homologous series of Poly phenylene vinylenes in which the phenylene units of the PPV structure are systematically substituted by naphthyl and anthyrl units is presented. Degradation is monitored according to the decay of the long wavelength absorption maximum upon illumination with UV radiation. Compared to Toluene solution, the photo-degradation is seen to be accelerated in Chloroform solution. All decays are fitted with first order kinetics. It is found that all substitutions improve the stability of the vinylene polymers against decay. In particular the highly electro-negative naphthyl group serves to drastically increase the stability …
