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Articles 13051 - 13080 of 33681
Full-Text Articles in Entire DC Network
Self-Energy Correction To The Hyperfine Splitting For Excited States, Benedikt J. Wundt, Ulrich D. Jentschura
Self-Energy Correction To The Hyperfine Splitting For Excited States, Benedikt J. Wundt, Ulrich D. Jentschura
Physics Faculty Research & Creative Works
The self-energy corrections to the hyperfine splitting is evaluated for higher excited states in hydrogenlike ions using an expansion in the binding parameter Zα, where Z is the nuclear-charge number and α is the fine-structure constant. We present analytic results for D, F, and G states, and for a number of highly excited Rydberg states, with principal quantum numbers in the range 13≤n≤16, and orbital angular momenta =n-2 and =n-1. A closed-form analytic expression is derived for the contribution of high-energy photons, valid for any state with ≥2 and arbitrary n, , and total angular momentum j. The low-energy contributions …
Low Energy (E,2e) Studies From Ch₄: Results From Symmetric Coplanar Experiments And Molecular Three-Body Distorted Wave Theory, Kate L. Nixon, Andrew James Murray, Hari Chaluvadi, Chuangang Ning, Don H. Madison
Low Energy (E,2e) Studies From Ch₄: Results From Symmetric Coplanar Experiments And Molecular Three-Body Distorted Wave Theory, Kate L. Nixon, Andrew James Murray, Hari Chaluvadi, Chuangang Ning, Don H. Madison
Physics Faculty Research & Creative Works
Low energy experimental and theoretical triply differential cross sections are presented for electron impact ionization of methane (CH4) for both the highest occupied molecular orbital (HOMO) and next highest occupied molecular orbital (NHOMO). The HOMO is a predominantly p-type orbital which is labeled 1t2 and the NHOMO is predominantly s-type labeled 2a 1. Coplanar symmetric (symmetric both in final state electron energies and observation angles) are presented for final state electron energies ranging from 2.5 to 20 eV. The theoretical M3DW (molecular three-body distorted wave) results are in surprisingly good agreement with experiment for the HOMO …
Analysis Of Effects Of Macroscopic Propagation And Multiple Molecular Orbitals On The Minimum In High-Order Harmonic Generation Of Aligned Co₂, Cheng Jin, Anh-Thu Le, C. D. Lin
Analysis Of Effects Of Macroscopic Propagation And Multiple Molecular Orbitals On The Minimum In High-Order Harmonic Generation Of Aligned Co₂, Cheng Jin, Anh-Thu Le, C. D. Lin
Physics Faculty Research & Creative Works
We report theoretical calculations of the effect of the multiple-orbital contribution in high-order harmonic generation (HHG) of aligned CO₂ with the inclusion of macroscopic propagation of harmonic fields in the medium. Our results show very good agreement with recent experiments for the dynamics of the minimum in HHG spectra as laser intensity or alignment angle changes. Calculations are carried out to check how the position of the minimum in HHG spectra depends on the degrees of molecular alignment, laser-focusing conditions, and the effects of alignment-dependent ionization rates of the different molecular orbitals. These analyses help to explain why the minima …
Relativistic Tight-Binding Model: Application To Pt Surfaces, Aleksandr V. Chernatynskiy, J. Woods Halley
Relativistic Tight-Binding Model: Application To Pt Surfaces, Aleksandr V. Chernatynskiy, J. Woods Halley
Physics Faculty Research & Creative Works
We report a parametrization of a previous self-consistent tight-binding model, suitable for metals with a high atomic number in which nonscalar-relativistic effects are significant in the electron physics of condensed phases. The method is applied to platinum. The model is fitted to density functional theory band structures and cohesive energies and spectroscopic data on platinum atoms in five oxidation states, and is then shown without further parametrization to correctly reproduce several low index surface structures. We also predict reconstructions of some vicinal surfaces.
Comparative Fecal Metagenomics Unveils Unique Functional Capacity Of The Swine Gut, Regina Lamendella, Jorge W. Santo Domingo, Shreya Ghosh, John Martinson, Daniel B. Oerther
Comparative Fecal Metagenomics Unveils Unique Functional Capacity Of The Swine Gut, Regina Lamendella, Jorge W. Santo Domingo, Shreya Ghosh, John Martinson, Daniel B. Oerther
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Background: Uncovering the taxonomic composition and functional capacity within the swine gut microbial consortia is of great importance to animal physiology and health as well as to food and water safety due to the presence of human pathogens in pig feces. Nonetheless, limited information on the functional diversity of the swine gut microbiome is available. Results: Analysis of 637, 722 pyrosequencing reads (130 megabases) generated from Yorkshire pig fecal DNA extracts was performed to help better understand the microbial diversity and largely unknown functional capacity of the swine gut microbiome. Swine fecal metagenomic sequences were annotated using both MG-RAST and …
The Missouri Miner, April 28, 2011
The Missouri Miner, April 21, 2011
Faculty Senate Minutes April 21, 2011, Missouri University Of Science And Technology Faculty Senate
Faculty Senate Minutes April 21, 2011, Missouri University Of Science And Technology Faculty Senate
Minutes & Agendas
No abstract provided.
The Missouri Miner, April 14, 2011
Direct Numerical Simulation Of Hypersonic Turbulent Boundary Layers. Part 3. Effect Of Mach Number, L. (Lian) Duan, I. Beekman, M. P. Martín
Direct Numerical Simulation Of Hypersonic Turbulent Boundary Layers. Part 3. Effect Of Mach Number, L. (Lian) Duan, I. Beekman, M. P. Martín
Mechanical and Aerospace Engineering Faculty Research & Creative Works
In this paper, we perform direct numerical simulations (DNS) of turbulent boundary layers with nominal free-stream Mach number ranging from 0.3 to 12. The main objective is to assess the scaling's with respect to the mean and turbulence behaviors as well as the possible breakdown of the weak compressibility hypothesis for turbulent boundary layers at high Mach numbers (M > 5). We find that many of the scaling relations, such as the van Driest transformation for mean velocity, Walz's relation, Morkovin's scaling and the strong Reynolds analogy, which are derived based on the weak compressibility hypothesis, remain valid for the range …
The Missouri Miner, April 7, 2011
7th Annual Undergraduate Research Conference Winners, Missouri University Of Science And Technology
7th Annual Undergraduate Research Conference Winners, Missouri University Of Science And Technology
Undergraduate Research Conference at Missouri S&T
No abstract provided.
7th Annual Undergraduate Research Conference Abstract Book, Missouri University Of Science And Technology
7th Annual Undergraduate Research Conference Abstract Book, Missouri University Of Science And Technology
Undergraduate Research Conference at Missouri S&T
No abstract provided.
Thermal Conductivity Of Interfacial Layers In Nanofluids, Zhi Liang, Hai-Lung Tsai
Thermal Conductivity Of Interfacial Layers In Nanofluids, Zhi Liang, Hai-Lung Tsai
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Thermal Conductivity of Interfacial Layers is an Essential Parameter for Determining How the Ordered Liquid Layering Around the Particle-Liquid Interface Contributes to the Unusual High Thermal Conductivity of Nanofluids. However, So Far There is No Experimental Data Regarding This Parameter. using Nonequilibrium Molecular Dynamics Simulations of an Inhomogeneous Au-Ar System in Which the Solid-Liquid Interactions Are Assumed to Be Much Stronger Than the Liquid-Liquid Interactions, We Show Explicitly that the Thermal Conductivity of a 1-Nm-Thick Interfacial Layer is 1.6∼2.5 Times Higher Than that of the Base Fluid. the Simulation Results Are Incorporated into a Three-Level Clustering Model to Calculate the …
A Case For On-Machine Load Balancing, Shoukat Ali, Behdis Eslamnour, Zehra Shah
A Case For On-Machine Load Balancing, Shoukat Ali, Behdis Eslamnour, Zehra Shah
Electrical and Computer Engineering Faculty Research & Creative Works
This paper diverges from the traditional load balancing, and introduces a new principle called the on-machine load balance rule. the on-machine load balance rule leads to resource allocations that are better in tolerating uncertainties in the processing times of the tasks allocated to the resources when compared to other resource allocations that are derived using the conventional "across-the-machines" load balancing rule. the on-machine load balance rule calls for the resource allocation algorithms to allocate similarly sized tasks on a machine (in addition to optimizing some primary performance measures such as estimated make span and average response time). the on-machine load …
Leaching Of Potential Hazardous Elements Of Coal Cleaning Rejects, Luis F.O. Silva, Maria Izquierdo, Xavier Querol, Robert B. Finkelman, Marcos L.S. Oliveira, Marcus Wollenschlager, Mark R. Towler, Rafael Pérez-López, Felipe Macias
Leaching Of Potential Hazardous Elements Of Coal Cleaning Rejects, Luis F.O. Silva, Maria Izquierdo, Xavier Querol, Robert B. Finkelman, Marcos L.S. Oliveira, Marcus Wollenschlager, Mark R. Towler, Rafael Pérez-López, Felipe Macias
Chemical and Biochemical Engineering Faculty Research & Creative Works
The geochemical characteristics of coal cleaning rejects (CCR) in Santa Catarina State, Brazil, were investigated. Around 3.5 million ton/ year of coal waste are dumped in Santa Catarina State. Coal beneficiation by froth flotation results in large amounts of CCR composed of coaly and mineral matter, the latter characterized by the occurrence of sulphide minerals and a broad array of leachable elements. The total and leachable contents of more than 60 elements were analyzed. Atmospheric exposure promotes sulphide oxidation that releases substantial sulphate loads as well as Ca2+, K+, Mg2+, Cl- and Al3+ …
Blackbody-Radiation Correction To The Polarizability Of Helium, Mariusz Puchalski, Ulrich D. Jentschura, Peter J. Mohr
Blackbody-Radiation Correction To The Polarizability Of Helium, Mariusz Puchalski, Ulrich D. Jentschura, Peter J. Mohr
Physics Faculty Research & Creative Works
The correction to the polarizability of helium due to blackbody radiation is calculated near room temperature. A precise theoretical determination of the blackbody radiation correction to the polarizability of helium is essential for dielectric gas thermometry and for the determination of the Boltzmann constant. We find that the correction, for not too high temperature, is roughly proportional to a modified hyperpolarizability (two-color hyperpolarizability), which is different from the ordinary hyperpolarizability of helium. Our explicit calculations provide a definite numerical result for the effect and indicate that the effect of blackbody radiation can be excluded as a limiting factor for dielectric …
Competing Magnetic Interactions In The Intermetallic Compounds Pr 5ge3 And Nd5ge3, R. Nirmala, A. V. Morozkin, A. K. Nigam, Jagat Lamsal, W. B. Yelon, O. Isnard, S. A. Granovsky, K. Kamala Bharathi, S. Quezado, S. K. Malik
Competing Magnetic Interactions In The Intermetallic Compounds Pr 5ge3 And Nd5ge3, R. Nirmala, A. V. Morozkin, A. K. Nigam, Jagat Lamsal, W. B. Yelon, O. Isnard, S. A. Granovsky, K. Kamala Bharathi, S. Quezado, S. K. Malik
Physics Faculty Research & Creative Works
Magnetic properties of polycrystalline Pr5Ge3 and Nd5Ge3 (hexagonal, Mn5Si3-type) compounds have been studied. Magnetization measurements in 0.5 T field indicate that the Pr5Ge3 orders antiferromagnetically at 18 K (TN). However, in an applied field of 10 mT, the zero-field-cooled and field-cooled magnetization bifurcates below ∼65 K. This and the positive paramagnetic Curie temperature, obtained from the Curie-Weiss fit to the paramagnetic susceptibility, suggest the presence of competing ferromagnetic and antiferromagnetic interactions. the magnetization versus field isotherm at 5 K shows an S-shaped curve and a weak tendency …
Tracing The Redshift Evolution Of Hubble Parameter With Gravitational-Wave Standard Sirens, Atsushi J. Nishizawa, Atsushi Taruya, Shun Saito
Tracing The Redshift Evolution Of Hubble Parameter With Gravitational-Wave Standard Sirens, Atsushi J. Nishizawa, Atsushi Taruya, Shun Saito
Physics Faculty Research & Creative Works
Proposed space-based gravitational-wave detectors such as BBO and DECIGO can detect ~ 106 neutron star (NS) binaries and determine the luminosity distance to the binaries with high precision. Combining the luminosity distance and electromagnetically derived redshift, one would be able to probe cosmological expansion out to high redshift. In this paper, we show that the Hubble parameter as a function of redshift can be directly measured with monopole and dipole components of the luminosity distance on the sky. As a result, the measurement accuracies of the Hubble parameter in each redshift bin up to z=1 are 3-14%, 1.5-8%, and …
Hydrogen-Deuterium Isotope Shift: From The 1s-2s-Transition Frequency To The Proton-Deuteron Charge-Radius Difference, Ulrich D. Jentschura, Arthur N. Matveev, Christian G. Parthey, Janis Alnis, Randolf Pohl, Th H. Udem, Nikolai N. Kolachevsky, Theodor Wolfgang Hansch
Hydrogen-Deuterium Isotope Shift: From The 1s-2s-Transition Frequency To The Proton-Deuteron Charge-Radius Difference, Ulrich D. Jentschura, Arthur N. Matveev, Christian G. Parthey, Janis Alnis, Randolf Pohl, Th H. Udem, Nikolai N. Kolachevsky, Theodor Wolfgang Hansch
Physics Faculty Research & Creative Works
We analyze and review the theory of the hydrogen-deuterium isotope shift for the 1S-2S transition, which is one of the most accurately measured isotope shifts in any atomic system, in view of a recently improved experiment. A tabulation of all physical effects that contribute to the isotope shift is given. These include the Dirac binding energy, quantum electrodynamic effects, including recoil corrections, and the nuclear-size effect, including the pertaining relativistic and radiative corrections. From a comparison of the theoretical result Δfth=670999566.90(66)(60)kHz (exclusive of the nonrelativistic nuclear-finite-size correction) and the experimental result Δfexpt=670994334605(15) Hz, we infer the …
Effect Of Slide Gate And Embr On The Transport Of Inclusions And Bubbles In Slab Continuous Casting Strands, Yufeng Wang, Anping Dong, Lifeng Zhang
Effect Of Slide Gate And Embr On The Transport Of Inclusions And Bubbles In Slab Continuous Casting Strands, Yufeng Wang, Anping Dong, Lifeng Zhang
Materials Science and Engineering Faculty Research & Creative Works
This study is to investigate the effect of electromagnetic brake (EMBr) on fluid flow and particle motion in steel slab continuous casting strands. the effect of slide gate moving on fluid flow pattern was discussed. a strong swirl and asymmetrical flow at the outports and, subsequently, inside the slab mold, was induced by slide gate. the application of EMBr would be a remedy to the swirl flow in the casting mold. Flow pattern has great influence on the trajectories of injected bubbles and nonmetallic inclusions. More bubbles tend to release from the top surface near the wide face opposite to …
Neutron Diffraction Studies On The Heusler Alloy Ni50mn 37sb13, N. V. Rama Rao, J. Arout Chelvane, V. Chandrasekaran, A. V. Morozkin, J. Lamsal, William B. Yelon, R. Nirmala, K. G. Suresh, S. K. Malik
Neutron Diffraction Studies On The Heusler Alloy Ni50mn 37sb13, N. V. Rama Rao, J. Arout Chelvane, V. Chandrasekaran, A. V. Morozkin, J. Lamsal, William B. Yelon, R. Nirmala, K. G. Suresh, S. K. Malik
Physics Faculty Research & Creative Works
The evolution of martensitic to austenitic transformation in Ni50Mn37Sb13 has been studied using temperature dependent neutron diffraction, thermal property, and magnetization studies. Differential scanning calorimetric studies reveal a martensitic transformation TM around 291 K. the magnetization data yield a ferromagnetic ordering temperature of 329 K in the austenitic phase and 230 K in the martensitic phase. the analysis of the powder neutron diffraction data in the temperature range of 325-12 K indicates a structural transition from a high temperature cubic L21 type structure to an orthorhombic structure. at 270 K, both cubic and orthorhombic phases …
Magnetization And Neutron Diffraction Studies On Sr2timno 6, Jagat Lamsal, Rajib Mondal, Anil Kumar, K. Kamala Bharathi, P. N. Santhosh, R. Nirmala, A. K. Nigam, William B. Yelon, S. Quezado, S. K. Malik
Magnetization And Neutron Diffraction Studies On Sr2timno 6, Jagat Lamsal, Rajib Mondal, Anil Kumar, K. Kamala Bharathi, P. N. Santhosh, R. Nirmala, A. K. Nigam, William B. Yelon, S. Quezado, S. K. Malik
Physics Faculty Research & Creative Works
Magnetic properties of the double perovskite oxide, Sr2TiMnO6, have been studied by means of bulk magnetization and powder neutron diffraction experiments. Low field magnetization data reveal transitions at ∼45 K (TC) and at ∼15 K (TN). a magnetic moment value of only ∼0.23 BF.U. is attained at 5 K in the 7 T field. Powder neutron diffraction studies suggest the possible antiferromagnetic order in this compound at 12 K with moments of ∼0.5 B at the Mn site. © 2011 American Institute of Physics.
Manipulating Atomic Fragmentation Processes By Controlling The Projectile Coherence, Kisra N. Egodapitiya, Sachin D. Sharma, Ahmad Hasan, Aaron C. Laforge, Don H. Madison, Robert Moshammer, Michael Schulz
Manipulating Atomic Fragmentation Processes By Controlling The Projectile Coherence, Kisra N. Egodapitiya, Sachin D. Sharma, Ahmad Hasan, Aaron C. Laforge, Don H. Madison, Robert Moshammer, Michael Schulz
Physics Faculty Research & Creative Works
We have measured the scattering angle dependence of cross sections for ionization in p+H2 collisions for a fixed projectile energy loss. Depending on the projectile coherence, interference due to indistinguishable diffraction of the projectile from the two atomic centers was either present or absent in the data. This shows that, due to the fundamentals of quantum mechanics, the preparation of the beam must be included in theoretical calculations. The results have far-reaching implications on formal atomic scattering theory because this critical aspect has been overlooked for several decades.
Batio3–Srtio3 Layered Dielectrics For Energy Storage, Sheng Chao, Fatih Dogan
Batio3–Srtio3 Layered Dielectrics For Energy Storage, Sheng Chao, Fatih Dogan
Materials Science and Engineering Faculty Research & Creative Works
BaTiO3–SrTiO3 (BST) thick films (~ 250–390 μm) with layered structures were fabricated by tape-casting and lamination process. Layered composites with various Ba/Sr ratios were obtained by lamination of BaTiO3 (BT) and SrTiO3 (ST) tapes in different spatial configurations (2–2). As-prepared BST ceramics showed much improved sinterability over the laminates of pure BT or pure ST tapes. Dielectric properties of materials were measured in the temperature range of 25 °C to 200 °C. The method of utilizing of layered structures offered flexibility to maximize the energy storage capability at specific operating conditions: (temperature and electric field) …
The Missouri Miner, March 24, 2011
K-Out-Of-N Oblivious Transfer Based On Homomorphic Encryption And Solvability Of Linear Equations, Mummoorthy Murugesan, Wei Jiang, Ahmet Erhan Nergiz, Serkan Uzunbaz
K-Out-Of-N Oblivious Transfer Based On Homomorphic Encryption And Solvability Of Linear Equations, Mummoorthy Murugesan, Wei Jiang, Ahmet Erhan Nergiz, Serkan Uzunbaz
Computer Science Faculty Research & Creative Works
Oblivious Transfer (OT) is an important cryptographic tool, which has found its usage in many crypto protocols, such as Secure Multiparty Computations, Certified E-mail and Simultaneous Contract Signing. in this paper, we propose three k-out-of-n OT (OTkn) protocols based on additive homomorphic encryption. Two of these protocols prohibit malicious behaviors from a receiver. We also achieve efficient communication complexity bounded by O(l·n) in bits, where l is the size of the encryption key. the computational complexity is comparable to the most efficient existing protocols. Due to the semantic security property, the sender cannot get receiver's selection. When the receiver tries …
The Missouri Miner, March 17, 2011
Faculty Senate Minutes March 17, 2011, Missouri University Of Science And Technology Faculty Senate
Faculty Senate Minutes March 17, 2011, Missouri University Of Science And Technology Faculty Senate
Minutes & Agendas
No abstract provided.
X-Ray Emission Cross Sections Following Ar18⁺ Charge-Exchange Collisions On Neutral Argon: The Role Of The Multiple Electron Capture, Sebastian Otranto, Ronald E. Olson
X-Ray Emission Cross Sections Following Ar18⁺ Charge-Exchange Collisions On Neutral Argon: The Role Of The Multiple Electron Capture, Sebastian Otranto, Ronald E. Olson
Physics Faculty Research & Creative Works
X-ray emission originating in charge-exchange collisions between Ar18+ and neutral argon is studied at impact energies of 5-4000 eV/amu by means of the classical trajectory Monte Carlo method (CTMC). Line emission and charge-exchange cross sections obtained from different CTMC versions based on the one-active electron approximation are contrasted among themselves and against the results obtained by means of a three-active electron code that lets us infer the role of multiple electron capture. the present results are compared to the recent experimental data available from the EBIT groups operating at Livermore, NIST, and Berlin. We were not able to reconcile …