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Articles 1  27 of 27
FullText Articles in Physics
Diffusion And Drift In Terahertz Emission At Gaas Surfaces, James Heyman, N Coates, A Reinhardt, G Strasser
Diffusion And Drift In Terahertz Emission At Gaas Surfaces, James Heyman, N Coates, A Reinhardt, G Strasser
James Heyman
No abstract provided.
Magnetic And Transport Properties Of The V2– Vi3 Diluted Magnetic Semiconductor Sb2_Xmnxte3, Jeffrey Dyck, P. Svanda, P. Lostak, J. Horak, W. Chen, C. Uher
Magnetic And Transport Properties Of The V2– Vi3 Diluted Magnetic Semiconductor Sb2_Xmnxte3, Jeffrey Dyck, P. Svanda, P. Lostak, J. Horak, W. Chen, C. Uher
Jeffrey Dyck
We have measured electrical and magnetic properties of single crystals of Sb2_xMnxTe3 with x =0 – 0.045 at temperatures of 2 K to 300 K. Hall effect measurements indicate that each manganese atom donates approximately one hole to the valence band. The magnetic susceptibility is paramagnetic down to 2 K, and both Curie–Weiss and Brillouin analyses show that manganese substitutes for Sb and takes the Mn2+ state with S=5/2. Contrary to the case of III–V host matrices, manganese does not stimulate ferromagnetic order in the family of bulk layered V2– VI3 diluted magnetic semiconductors, at least ...
The Recent Evolution Of The Dwarf Starburst Galaxy Ngc 625 From Hubble Space Telescope Imaging, John M. Cannon, R C. DohmPalmer, E D. Skillman, D J. Bomans, S Cote, B W. Miller
The Recent Evolution Of The Dwarf Starburst Galaxy Ngc 625 From Hubble Space Telescope Imaging, John M. Cannon, R C. DohmPalmer, E D. Skillman, D J. Bomans, S Cote, B W. Miller
John Cannon
No abstract provided.
Effects Of Substrate Temperature And NearSubstrate Plasma Density On The Properties Of Dc Magnetron Sputtered Aluminum Doped Zinc Oxide, Nathan Schmidt, Thomas Totushek, William Kimes, David Callender, James Doyle
Effects Of Substrate Temperature And NearSubstrate Plasma Density On The Properties Of Dc Magnetron Sputtered Aluminum Doped Zinc Oxide, Nathan Schmidt, Thomas Totushek, William Kimes, David Callender, James Doyle
James R. Doyle
No abstract provided.
Monday Night Football: Physics Decides Controversial Call, Gregory A. Dilisi, Richard A. Rarick
Monday Night Football: Physics Decides Controversial Call, Gregory A. Dilisi, Richard A. Rarick
Gregory A. DiLisi
Light Propagation In VariableRefractiveIndex Materials With LiquidCrystalInfiltrated Microcavities, Bin Wang, Philip Bos, Charles D. Hoke
Light Propagation In VariableRefractiveIndex Materials With LiquidCrystalInfiltrated Microcavities, Bin Wang, Philip Bos, Charles D. Hoke
Philip J. Bos
A liquidcrystalinfiltrated microcavity structure is proposed as a variablerefractiveindex material. It has the advantages over previously considered nanostructured materials of having a larger phaseangle change and lower driving voltage. Twodimensional liquidcrystal director and finitedifference timedomain optical simulations are used to select liquid crystal material parameters and optimize the dimension of the microcavity structured material.
Quantum Corrections To The Schwarzschild And Kerr Metrics, N. E. J. BjerrumBohr, John Donoghue, Barry R. Holstein
Quantum Corrections To The Schwarzschild And Kerr Metrics, N. E. J. BjerrumBohr, John Donoghue, Barry R. Holstein
John Donoghue
We examine the corrections to the lowest order gravitational interactions of massive particles arising from gravitational radiative corrections. We show how the masslessness of the graviton and the gravitational selfinteractions imply the presence of nonanalytic pieces ;A2q2,;q2ln2q2, etc., in the form factors of the energymomentum tensor and that these correspond to long range modifications of the metric tensor gmn of the form G2m2/r2,G2m\/r3, etc. The former coincide with well known solutions from classical general relativity, while the latter represent new quantum mechanical effects, whose strength and form is necessitated by the low energy quantum nature of ...
Spectral Representation Of The Electrical Properties Of Layered Materials., Anthony Day, A. Mcgurn, D. Bergman, M. Thorpe
Spectral Representation Of The Electrical Properties Of Layered Materials., Anthony Day, A. Mcgurn, D. Bergman, M. Thorpe
Anthony Roy Day
We present a spectral representation for the effective conductivity of two homogeneous layers joined at a rough interface. This spectral representation is closely related to the BergmanMilton spectral representation for bulk composites, and is easily extended to multilayered materials. By comparing the layered system to a reference layered system that has a flat interface, we form a surface spectral density that captures all the effects of surface structure on the effective conductivity of the layered sample, and is independent of the conductivities of the two layers. Because of the anisotropy of the layered system there are two surface spectral densities ...
Effect Of Parallel Velocity Shear On The Electrostatic IonCyclotron Instability In Flamentary Current Channels, Erick Agrimson, SuHyun Kim, Nicola D'Angelo, Robert L. Merlino
Effect Of Parallel Velocity Shear On The Electrostatic IonCyclotron Instability In Flamentary Current Channels, Erick Agrimson, SuHyun Kim, Nicola D'Angelo, Robert L. Merlino
Erick Agrimson
No abstract provided.
Femtosecond PhaseCoherent TwoDimensional Spectroscopy, Peifang Tian, Dorine Keusters, Yoshifumi Suzaki, Warren S. Warren
Femtosecond PhaseCoherent TwoDimensional Spectroscopy, Peifang Tian, Dorine Keusters, Yoshifumi Suzaki, Warren S. Warren
Peifang Tian
Femtosecond phasecoherent twodimensional (2D) spectroscopy has been experimentally demonstrated as the direct optical analog of 2D nuclear magnetic resonance. An acoustooptic pulse shaper created a collinear threepulse sequence with wellcontrolled and variable interpulse delays and phases, which interacted with a model atomic system of rubidium vapor. The desired nonlinear polarization was selected by phase cycling (coadding experimental results obtained with different interpulse phases). This method may enhance our ability to probe the femtosecond structural dynamics of macromolecules.
Mobility Of Taxol In Microtubule Bundles, Jennifer Ross, D. Kuchnir Fygenson
Mobility Of Taxol In Microtubule Bundles, Jennifer Ross, D. Kuchnir Fygenson
Jennifer Ross
Mobility of taxol inside microtubules was investigated using fluorescence recovery after photobleaching on flowaligned bundles. Bundles were made of microtubules with either GMPCPP or GTP at the exchangeable site on the tubulin dimer. Recovery times were sensitive to bundle thickness and packing, indicating that taxol molecules are able to move laterally through the bundle. The density of open binding sites along a microtubule was varied by controlling the concentration of taxol in solution for GMPCPP samples. With [63% sites occupied, recovery times were independent of taxol concentration and, therefore, inversely proportional to the microscopic dissociation rate, koff. It was found ...
Brane Dynamics From Nonlinear Realizations, T Clark, M Nitta, Tonnis Ter Veldhuis
Brane Dynamics From Nonlinear Realizations, T Clark, M Nitta, Tonnis Ter Veldhuis
Tonnis ter Veldhuis
No abstract provided.
Effect Of Sn Substituting For Sb On The LowTemperature Transport Properties Of YtterbiumFilled Skutterudites, J. Yang, D. Morelli, G. Meisner, W. Chen, Jeffrey Dyck, C. Uher
Effect Of Sn Substituting For Sb On The LowTemperature Transport Properties Of YtterbiumFilled Skutterudites, J. Yang, D. Morelli, G. Meisner, W. Chen, Jeffrey Dyck, C. Uher
Jeffrey Dyck
We examine the effect of alloying Sn on the Sb site of ytterbiumfilled skutterudites, a promising class of thermoelectric materials. We report measurements of the Hall effect, electrical resistivity, Seebeck coefficient, and thermal conductivity between 2 and 300 K on two series of samples having different ytterbium filling fractions: Yb0.19Co4Sb12xSnx, with x=0, 0.05, 0.1, and 0.2, and Yb0.5Co4Sb12xSnx, with x=0.5, 0.6, 0.8, 0.83, and 0.9. We find that the substitution of Sn does not lower the electron concentration of these samples, but rather gives rise to a ptype ...
Dynamics Of Conformal Maps For A Class Of NonLaplacian Growth Phenomena, Martin Z. Bazant, Jaehyuk Choi, Benny Davidovitch
Dynamics Of Conformal Maps For A Class Of NonLaplacian Growth Phenomena, Martin Z. Bazant, Jaehyuk Choi, Benny Davidovitch
Benny Davidovitch
Timedependent conformal maps are used to model a class of growth phenomena limited by coupled nonLaplacian transport processes, such as nonlinear diffusion, advection, and electro migration. Both continuous and stochastic dynamics are described by generalizing conformal mapping techniques for viscous fingering and diffusionlimited aggregation, respectively. A gen eral notion of time in stochastic growth is also introduced. The theory is applied to simulations of advectiondiffusionlimited aggregation in a background potential flow. A universal crossover in mor phology is observed from diffusionlimited to advectionlimited fractal patterns with an associated crossover in the growth rate, controlled by a timedependent effective Peclet number ...
A Comparative Study Of Interatomic Potentials For Copper And Aluminum Gas Phase Sputter Atom Transport Simulations, Keith Kuwata, Rachel Erickson, James Doyle
A Comparative Study Of Interatomic Potentials For Copper And Aluminum Gas Phase Sputter Atom Transport Simulations, Keith Kuwata, Rachel Erickson, James Doyle
James R. Doyle
No abstract provided.
Ultrafast TwoPhoton Free Induction Decay, D. Keusters, Peifang Tian, W. Warren
Ultrafast TwoPhoton Free Induction Decay, D. Keusters, Peifang Tian, W. Warren
Peifang Tian
No abstract provided.
A Comparison Of SemiAnalytical And Numerical Solutions For The Microwave Heating Of A Lossy Material In A ThreeDimensional Waveguide, Prof. Tim Marchant
A Comparison Of SemiAnalytical And Numerical Solutions For The Microwave Heating Of A Lossy Material In A ThreeDimensional Waveguide, Prof. Tim Marchant
Tim Marchant
The microwave heating of a threedimensional block in an infinitely long rectangular waveguide propagating the TE10 mode is considered. The electrical conductivity (the dielectric loss) is assumed to be a function of temperature, and modelled by the Arrhenius law. A coupled set of equations is obtained that describes the electromagnetic fields and the temperature distribution in the block. The numerical solutions of this problem are obtained by two methods, the well known FDTD scheme and a frequency domain method which makes the further assumption that a single TE10 mode exists in the waveguide and material. The results show that an ...
DynamicStochastic Modeling Of A Municipal Water Supply System In Stella, Stephen Mecca, R. Lamontagne
DynamicStochastic Modeling Of A Municipal Water Supply System In Stella, Stephen Mecca, R. Lamontagne
Stephen J. Mecca
A dynamicstochastic model of a reservoir and municipal water system has been developed and studied. The overall structure of the model, which is written in Stella?, is presented; the physical environmental and end use segments are outlined and sample simulation results are presented. The flexibility of the model to encompass physical changes in the system is highlighted. Alternative representations of enduse are outlined and the applications of this type of modeling for policy analysis and water resources management is suggested. The design and status of ongoing studies to validate key components of the model are discussed.
Micro Thermoelectric Cooler Fabrication: Growth And Characterization Of Patterned Sb2te3 And Bi2te3 Films ., Luciana Da Silva, M. Kaviany, A. Dehennis, Jeffrey Dyck
Micro Thermoelectric Cooler Fabrication: Growth And Characterization Of Patterned Sb2te3 And Bi2te3 Films ., Luciana Da Silva, M. Kaviany, A. Dehennis, Jeffrey Dyck
Jeffrey Dyck
A columntype micro thermoelectric cooler is being fabricated using ptype Sb2Te3 and ntype Bi2Te3 films (approximately 4 μm thick). The films are grown by thermal coevaporation and patterned on Cr/Au/Ti/Pt (hot) connectors, which are deposited onto a silicon dioxide coated wafer. The column height is limited by control of the Te deposition rate. Although a high substrate temperature during thermoelectric film deposition is desired, it has been limited by the degradation of the photoresist used for patterning. The measured Seebeck coefficient and electrical resistivity of the thermoelectric films are reported, and preliminary results show that excess tellurium ...
Femtosecond Pulse Shaping Approaches To Multiphoton Imaging., W. Warren, W. Wagner, Peifang Tian, T. Ye
Femtosecond Pulse Shaping Approaches To Multiphoton Imaging., W. Warren, W. Wagner, Peifang Tian, T. Ye
Peifang Tian
No abstract provided.
Transport Coefficients Of TitaniumDoped Sb2te3 Crystals., P. Svanda, P. LošŤÁK, Č. Drašar, Jeffrey Dyck
Transport Coefficients Of TitaniumDoped Sb2te3 Crystals., P. Svanda, P. LošŤÁK, Č. Drašar, Jeffrey Dyck
Jeffrey Dyck
Titaniumdoped single crystals (cTi = 0 to 2×1020 atoms cm3) were prepared from the elements Sb, Ti, and Te of 5N purity by a modified Bridgman method. The obtained crystals were characterized by measurements of the temperature dependence of the electrical resistivity, Hall coefficient, Seebeck coefficient and thermal conductivity in the temperature range of 5300 K. It was observed that with an increasing Ti content in the samples the electrical resistance, the Hall coefficient and the Seebeck coefficient increase. This means that the incorporation of Ti atoms into the Sb2Te3 crystal structure results in a decrease in the concentration of ...
InfraredActive Vibron Bands Associated With Substitutional Impurities In Solid Parahydrogen, Robert Hinde
InfraredActive Vibron Bands Associated With Substitutional Impurities In Solid Parahydrogen, Robert Hinde
Robert Hinde
We present a model for the line shapes of infraredactive Q_{1}(0) vibron bands observed in solid parahydrogen doped with low concentrations of spherical substitutional impurities. The line shapes are highly sensitive to the H_{2} vibrational dependence of the dopant–H_{2} interaction. When this vibrational dependence is strong, the dopant can trap the infraredactive vibron in its first solvation shell; in this case, the trapped vibron manifests itself in the absorption spectrum as a narrow feature to the red of the pure solid’s vibron band.
Bogomol'nyi, Prasad And Sommerfield Configurations In Smectics, Christian Santangelo, Randall D. Kamien
Bogomol'nyi, Prasad And Sommerfield Configurations In Smectics, Christian Santangelo, Randall D. Kamien
Christian Santangelo
It is typical in smectic liquid crystals to describe elastic deformations with a linear theory when the elastic strain is small. In smectics, certain essential nonlinearities arise from the requirement of rotational invariance. By employing the Bogomol’nyi, Prasad, and Sommerfield decomposition and relying on boundary conditions and geometric invariants, we have found a large class of exact solutions. We introduce an approximation for the deformation profile far from a spherical inclusion and find an enhanced attractive interaction at long distances due to the nonlinear elasticity, confirmed by numerical minimization.
Improved Determination Of The Electroweak Penguin Contribution To E’/E In The Chiral Limit, Vincenzo Cirigliano, John Donoghue, Eugene Golowich, Kim Maltman
Improved Determination Of The Electroweak Penguin Contribution To E’/E In The Chiral Limit, Vincenzo Cirigliano, John Donoghue, Eugene Golowich, Kim Maltman
John Donoghue
We perform a finite energy sum rule analysis of the flavor ud twopoint VA current correlator, Delta Pi (Q^2). The analysis, which is performed using both the ALEPH and OPAL databases for the VA spectral function, Delta rho, allows us to extract the dimension six VA OPE coefficient, a_6, which is related to the matrix element of the electroweak penguin operator, Q_8, by chiral symmetry. The result for a_6 leads directly to the improved (chiral limit) determination epsilon'/epsilon = ( 15.0 + 2.7) 10^{4}. Determination of higher dimension OPE contributions also allows us to perform an independent test ...
Ground State Numerical Study Of The ThreeDimensional Random Field Ising Model, I. Dukovski, Jonathan Machta
Ground State Numerical Study Of The ThreeDimensional Random Field Ising Model, I. Dukovski, Jonathan Machta
Jonathan Machta
The random field Ising model in three dimensions with Gaussian random fields is studied at zero temperature for system sizes up to 603. For each realization of the normalized random fields, the strength of the random field, Δ and a uniform external, H is adjusted to find the finitesize critical point. The finitesize critical point is identified as the point in the H−Δ plane where three degenerate ground states have the largest discontinuities in the magnetization. The discontinuities in the magnetization and bond energy between these ground states are used to calculate the magnetization and specific heat critical exponents ...
Novel Examples Of Achiral BentCore Azo Compounds Exhibiting B1 And AnticlinicAntiferroelectric B2 Mesophases, Veena Prasad, ShinWoong Kang, Satyendra Kumar
Novel Examples Of Achiral BentCore Azo Compounds Exhibiting B1 And AnticlinicAntiferroelectric B2 Mesophases, Veena Prasad, ShinWoong Kang, Satyendra Kumar
Satyendra Kumar
The first examples of achiral bentcore molecules consisting of an azo linkage and five aromatic rings exhibiting bentcore mesophases are reported. They exhibit B1 and B2 phases as identified by optical microscopy, differential scanning calorimetry, Xray diffraction, and electrooptical techniques. The B2 phase of these materials is identified to be the anticlinic–antiferroelectric, SmCAPA phase. The mesophases of these compounds have relatively low transition temperatures and wide temperature ranges. The observation of bentcore phases in azo compounds assumes significance from the fact that the introduction of the –NN– linkage adds a new dimension, namely photochromism, to this field.
Connection Between AdamGibbs Theory And Spatially Heterogeneous Dynamics, N. Giovambattista, S. V. Buldyrev, Francis W. Starr, H. E. Stanley
Connection Between AdamGibbs Theory And Spatially Heterogeneous Dynamics, N. Giovambattista, S. V. Buldyrev, Francis W. Starr, H. E. Stanley
Francis Starr
No abstract provided.