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Articles 1  30 of 47
FullText Articles in Physics
The Minimal Model Of Nonbaryonic Dark Matter: A Singlet Scalar, C Burgess, M Pospelov, Tonnis Ter Veldhuis
The Minimal Model Of Nonbaryonic Dark Matter: A Singlet Scalar, C Burgess, M Pospelov, Tonnis Ter Veldhuis
Tonnis ter Veldhuis
No abstract provided.
The Evidence Of The Mode Selectivity Of The Infrared Predissociation Reaction Of The Hydrogen Bonds In The Aniline–Water–Pyrrole Cluster Cation, Taisuke Nakanaga, Naveed Piracha, Fumiyuki Ito
The Evidence Of The Mode Selectivity Of The Infrared Predissociation Reaction Of The Hydrogen Bonds In The Aniline–Water–Pyrrole Cluster Cation, Taisuke Nakanaga, Naveed Piracha, Fumiyuki Ito
Naveed K. Piracha
The infrared spectrum of aniline–water–pyrrole cluster cation has been measured in the 3 μm region. Four strong vibrational bands were observed at 3313, 3515, 3637, and 3721cm−1, and the cluster dissociated into fragments in two reaction paths, AWP+→AW++P and AWP+→AP++W (A: aniline, W: water, P: pyrrole) when it absorbed an infrared photon. The branching ratio (AW+/AP+) has been determined to be 0.20±0.02 for the NH stretching vibration of aniline (3313cm−1, hydrogenbonded to pyrrole) and 0.14±0.03 for the other three bands. This vibrational mode dependence should ...
Relativistic Effects And TwoBody Currents In 2h(E⃗,E′P)N Using OutOfPlane Detection, Z L. Zhou, X Jiang, R Hicks, A Hotta, R Miskimen, Gerald Alvin Peterson, J Shaw
Relativistic Effects And TwoBody Currents In 2h(E⃗,E′P)N Using OutOfPlane Detection, Z L. Zhou, X Jiang, R Hicks, A Hotta, R Miskimen, Gerald Alvin Peterson, J Shaw
Gerald Alvin Peterson
Measurements of the 2H(e⃗,e′p)n reaction were performed with the outofplane magnetic spectrometers (OOPS) at the MITBates Linear Accelerator. The longitudinaltransverse, fLT and fLT′, and the transversetransverse, fTT, interference responses at a missing momentum of 210MeV/c were simultaneously extracted in the dip region at Q2 = 0.15 (GeV/c)2. In comparison to models of deuteron electrodisintegration, the data clearly reveal strong effects of relativity and finalstate interactions and the importance of twobody mesonexchange currents and isobar configurations. We demonstrate that such effects can be disentangled by extracting these responses using the novel outofplane technique.
Transport Properties Of Bi2−Xinxse3 Single Crystals., J. Navrátil, T. Plecháček, J. Horák, S. Karamazov, P. LošŤÁK, Jeffrey Dyck, W. Chen, C. Uher
Transport Properties Of Bi2−Xinxse3 Single Crystals., J. Navrátil, T. Plecháček, J. Horák, S. Karamazov, P. LošŤÁK, Jeffrey Dyck, W. Chen, C. Uher
Jeffrey Dyck
The paper reports on the temperature dependence of the electrical and thermal conductivity, Hall constant, and Seebeck coefficient of Bi2−xInxSe3 (x=0, 0.2, 0.4) single crystals measured over the temperature range from 2 to 300 K. One singlevalley conduction band model is used to interpret relations among transport coefficients. The data analysis relies on the use of a mixed carrier scattering mechanism consisting of acoustic scattering and scattering on ionized impurities. The effect of In incorporation into the Bi2Se3 crystal lattice on the individual components of thermal conductivity is evaluated and discussed. Copyright 2001 Academic Press.
Electroproduction Of The Λ(1520) Hyperon, S P. Barrow, L Dennis, S B. Mcaleer, B Asavapibhop, R S. Hicks, D Lawrence, R Miskimen, Gerald Alvin Peterson, J Shaw
Electroproduction Of The Λ(1520) Hyperon, S P. Barrow, L Dennis, S B. Mcaleer, B Asavapibhop, R S. Hicks, D Lawrence, R Miskimen, Gerald Alvin Peterson, J Shaw
Gerald Alvin Peterson
The reaction ep⃗e′K+Λ(1520) with Λ(1520)→p′K was studied at electron beam energies of 4.05, 4.25, and 4.46 GeV, using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The cosθK+, φK+, Q2, and W dependencies of Λ(1520) electroproduction are presented for the kinematic region 0.9
Towards String Predictions, G Cleaver, A Faraggi, D Nanopoulos, Tonnis Ter Veldhuis
Towards String Predictions, G Cleaver, A Faraggi, D Nanopoulos, Tonnis Ter Veldhuis
Tonnis ter Veldhuis
No abstract provided.
Anomalous Barium Filling Fraction And NType Thermoelectric Performance Of Ba[Sub Y]Co[Sub 4]Sb[Sub 12]., L. Chen, T. Kawahara, X. Tang, T. Goto, T. Hirai, Jeffrey Dyck, W. Chen, C. Uher
Anomalous Barium Filling Fraction And NType Thermoelectric Performance Of Ba[Sub Y]Co[Sub 4]Sb[Sub 12]., L. Chen, T. Kawahara, X. Tang, T. Goto, T. Hirai, Jeffrey Dyck, W. Chen, C. Uher
Jeffrey Dyck
Bariumfilled skutterudites BaCoSb with an anomalously large filling fraction of up to y=0.44 have been synthesized. The lattice parameters increase linearly with Ba content. Magnetic susceptibility data show that BaCoSb is paramagnetic, which implies that some of the Co atoms in BaCoSb have acquired a magnetic moment. The presence of the two different valence states of Co (Co3+ and Co2+) leads to the anomalously large barium filling fraction even without extra charge compensation. All samples show ntype conduction. The electrical conductivity increases with increasing the Ba filling fraction. The lattice thermal conductivity of BaCoSb is significantly depressed as ...
Terahertz Emission From Gaas And Inas In A Magnetic Field, James Heyman, P Neocleous, D Hebert, P.A. Crowell, T Muller, K Unterrainer
Terahertz Emission From Gaas And Inas In A Magnetic Field, James Heyman, P Neocleous, D Hebert, P.A. Crowell, T Muller, K Unterrainer
James Heyman
No abstract provided.
Exact Topological Density In The Lattice Skyrme Model, Alec Schramm, Benjamin Svetitsky
Exact Topological Density In The Lattice Skyrme Model, Alec Schramm, Benjamin Svetitsky
Alec J Schramm
We propose using the Skyrme model on a lattice as an eﬀective ﬁeld theory of meson–baryon interactions. To this end we construct a local topological density that involves the volumes of tetrahedra in the target space S3 and we make use of Coxeter’s formula for the Schla¨ﬂi function to implement it. We calculate the meansquare radius of a skyrmion in the threedimensional Skyrme model, and ﬁnd some surprises.
Third Generation Seesaw Mixing With New VectorLike WeakDoublet Quarks, Marko Popovic
Third Generation Seesaw Mixing With New VectorLike WeakDoublet Quarks, Marko Popovic
Marko B. Popovic
We present a class of models with a third generation seesaw mixing with new vectorlike weakdoublet quarks. We analyze a lowenergy phenomenology and present several strong dynamics, highenergy realizations of these models. In the topcolortype scenario, named topbottom color, we obtain an effective, composite two Higgs doublet model where the third generation isospin splitting is introduced via tilting interactions related to the broken nonAbelian gauge groups @i.e., without strong, trivialitysensitive U~1! groups#. In addition, we discuss t t ¯ production at the Next Linear Collider and suggest how one can experimentally observe and distinguish between the weakdoublet and the ...
Russian Summary Of Phd Dissertation, Serge Y. Kalmykov
Russian Summary Of Phd Dissertation, Serge Y. Kalmykov
Serge Youri Kalmykov
Notarized English Translation Of The Author's Summary Of Phd Dissertation, Serge Y. Kalmykov
Notarized English Translation Of The Author's Summary Of Phd Dissertation, Serge Y. Kalmykov
Serge Youri Kalmykov
Stimulated Raman Scattering Of Short Intense Laser Pulses In Plasmas, Serge Y. Kalmykov
Stimulated Raman Scattering Of Short Intense Laser Pulses In Plasmas, Serge Y. Kalmykov
Serge Youri Kalmykov
Measurement Of The Elastic Magnetic Form Factor Of 3he At High Momentum Transfer, I Nakagawa, J Shaw, S Churchwell, X Jiang, B Asavapibhop, M C. Berisso, P E. Bosted, K Burchesky, R S. Hicks, A Hotta, R A. Miskimen, Gerald Alvin Peterson, S E. Rock
Measurement Of The Elastic Magnetic Form Factor Of 3he At High Momentum Transfer, I Nakagawa, J Shaw, S Churchwell, X Jiang, B Asavapibhop, M C. Berisso, P E. Bosted, K Burchesky, R S. Hicks, A Hotta, R A. Miskimen, Gerald Alvin Peterson, S E. Rock
Gerald Alvin Peterson
New electron scattering measurements have been made that extend data on the 3He elastic magnetic form factor up to Q2 = 42.6fm2. These new data test theoretical conjectures regarding nonnucleonic effects in the threebody system. The very small cross sections, as low as 1040cm2/sr, required the use of a highpressure cryogenic gas target and a detector system with excellent background rejection capability. No existing theoretical calculation satisfactorily accounts for all the available data.
Excitation Of IonAcousticLike Waves By Subcritical Currents In A Plasma Having Equal Electron And Ion Temperatures, Erick Agrimson, Nicola D'Angelo, Robert L. Merlino
Excitation Of IonAcousticLike Waves By Subcritical Currents In A Plasma Having Equal Electron And Ion Temperatures, Erick Agrimson, Nicola D'Angelo, Robert L. Merlino
Erick Agrimson
No abstract provided.
On The Effect Of Electron Plasma Waves With Relativistic Phase Velocity On LargeAngle Stimulated Raman Scattering Of Modulated Short Laser Pulse In Plasmas, Nikolai E. Andreev, Serguei Y. Kalmykov
On The Effect Of Electron Plasma Waves With Relativistic Phase Velocity On LargeAngle Stimulated Raman Scattering Of Modulated Short Laser Pulse In Plasmas, Nikolai E. Andreev, Serguei Y. Kalmykov
Serge Youri Kalmykov
Suppression of a largeangle stimulated Raman scattering (LASRS) of a short modulated (twofrequency) laser pulse in a transparent plasma in the presence of a linear longwavelength electron plasma wave (LW EPW) having relativistic phase velocity is considered under the conditions of weak and strong coupling. The laser spectrum includes two components with a frequency shift equal to the frequency of the LW EPW. The mutual influence of different spectral components of a laser on the SRS under a given angle in the presence of the LW EPW is examined.
Exclusive Electroproduction Of Φ Mesons At 4.2 Gev, K Lukashin, E S. Smith, B Asavapibhop, R A. Hicks, D Lawrence, R Miskimen, Gerald Alvin Peterson, J Shaw
Exclusive Electroproduction Of Φ Mesons At 4.2 Gev, K Lukashin, E S. Smith, B Asavapibhop, R A. Hicks, D Lawrence, R Miskimen, Gerald Alvin Peterson, J Shaw
Gerald Alvin Peterson
We studied the exclusive reaction ep⃗e′p′φ using the φ⃗K+K decay mode. The data were collected using a 4.2 GeV incident electron beam and the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility. Our experiment covers the range in Q2 from 0.7 to 2.2 GeV2, and W from 2.0 to 2.6 GeV. Taken together with all previous data, we find a consistent picture of φ production on the proton. Our measurement shows the expected decrease of the t slope with the vectormeson formation time cΔτ below 2 ...
Entropy Bounds, Monotonicity Properties And Scaling In Cfts, D. Klemm, A.C. Petkou, George Siopsis
Entropy Bounds, Monotonicity Properties And Scaling In Cfts, D. Klemm, A.C. Petkou, George Siopsis
George Siopsis
We study the ratio of the entropy to the total energy in conformal field theories at finite temperature. For the free field realizations of N=4 source super Yang–Mills theory in D=4 and the (2,0) tensor multiplet in D=6, the ratio is bounded from above. The corresponding bounds are less stringent than the recently proposed Verlinde bound. We show that entropy bounds arise generically in CFTs in connection to monotonicity properties with respect to temperature changes of a generalized Cfunction. For strongly coupled CFTs with AdS duals, we show that the ratio obeys the Verlinde ...
Investigation Of The Structure Of T He Ternary Cluster Of Aniline−Water−Tetrahydrofuran And Its Cation By Infrared Depletion Spectroscopy, Taisuke Nakanaga, Naveed Piracha, Fumiyuki Ito
Investigation Of The Structure Of T He Ternary Cluster Of Aniline−Water−Tetrahydrofuran And Its Cation By Infrared Depletion Spectroscopy, Taisuke Nakanaga, Naveed Piracha, Fumiyuki Ito
Naveed K. Piracha
No abstract provided.
Simulation Of Inviscid MultiSpecies Plasma Flow, Alexandre Martin, Marcelo Reggio, JeanYves Trépanier
Simulation Of Inviscid MultiSpecies Plasma Flow, Alexandre Martin, Marcelo Reggio, JeanYves Trépanier
Alexandre Martin
Temperature Of D3Branes Off Extremality, Suphot Musiri, George Siopsis
Temperature Of D3Branes Off Extremality, Suphot Musiri, George Siopsis
George Siopsis
We discuss nonextremal rotating D3branes. We solve the wave equation for scalars in the supergravity background of certain distributions of branes and compute the absorption coefficients. The form of these coefficients is similar to the graybody factors associated with blackhole scattering. They are given in terms of two different temperature parameters, indicating that fields (open string modes) do not remain in thermal equilibrium as we move off extremality. This should shed some light on the origin of the disagreement between the supergravity and conformal field theory results on the free energy of a system of noncoincident Dbranes.
Domain Walls In Supersymmetric Qcd: The Taming Of The Zoo, D Binosi, Tonnis Ter Veldhuis
Domain Walls In Supersymmetric Qcd: The Taming Of The Zoo, D Binosi, Tonnis Ter Veldhuis
Tonnis ter Veldhuis
No abstract provided.
A2bi8se1 3 (A = Rb, Cs), Csbi3.67se6, And Babi2< /Inf>Se4: New Ternary Semiconducting Bismuth Selenides, Lykourgis Iordanidis, Paul Brazis, Theodora Kyratsi, John Irel, Melissa Lane, Carl Kannewurf, Wei Chen, Jeffrey Dyck, Ctirad Uher, Nishant Ghelani, Tim Hogan, Mercouri Kanatzidis
A2bi8se1 3 (A = Rb, Cs), Csbi3.67se6, And Babi2Se4: New Ternary Semiconducting Bismuth Selenides, Lykourgis Iordanidis, Paul Brazis, Theodora Kyratsi, John Irel, Melissa Lane, Carl Kannewurf, Wei Chen, Jeffrey Dyck, Ctirad Uher, Nishant Ghelani, Tim Hogan, Mercouri Kanatzidis
Jeffrey Dyck
No abstract provided.
Bps Saturated Domain Walls Along A Compact Dimension, R Hofmann, Tonnis Ter Veldhuis
Bps Saturated Domain Walls Along A Compact Dimension, R Hofmann, Tonnis Ter Veldhuis
Tonnis ter Veldhuis
No abstract provided.
Leaving The Bps Bound: Tunneling Of Classically Saturated Solitons, D Binosi, M Shifman, Tonnis Ter Veldhuis
Leaving The Bps Bound: Tunneling Of Classically Saturated Solitons, D Binosi, M Shifman, Tonnis Ter Veldhuis
Tonnis ter Veldhuis
No abstract provided.
Simple Relationships For The Estimation Of Melting Temperatures Of Homologous Series, James S. Chickos, Gary Nichols
Simple Relationships For The Estimation Of Melting Temperatures Of Homologous Series, James S. Chickos, Gary Nichols
James Chickos
No abstract provided.
The Influence Of Ni On The Transport Properties Of Cosb3, C. Uher, Jeffrey Dyck, W. Chen, G. Meisner, J. Yang
The Influence Of Ni On The Transport Properties Of Cosb3, C. Uher, Jeffrey Dyck, W. Chen, G. Meisner, J. Yang
Jeffrey Dyck
The effect of Ni doping on the Co site of the binary skutterudite CoSb3 is investigated. We measured resistivity, Hall effect, magnetoresistance, thermopower, thermal conductivity, and magnetization of a series of samples of the form Co1xNixSb3 with x in the range x=0 to x=0.01. We find that Ni takes the tetravalent state Ni4+, assumes the d6 electronic configuration for the lower energy nonbonding orbitals, and gives an electron to the conduction band. Ni doping dramatically suppresses the thermal conductivity, changes the temperature dependence of the thermopower, and increases the carrier concentration. Low temperature anomalies in thermopower, Hall ...
Low Temperature Thermoelectric Properties Of Ni Doped NType Filled Skutterudites Ba0.3co4sb12 ., W. Chen, Jeffrey Dyck, C. Uher, L. Chen, X. Tang, T. Hirai
Low Temperature Thermoelectric Properties Of Ni Doped NType Filled Skutterudites Ba0.3co4sb12 ., W. Chen, Jeffrey Dyck, C. Uher, L. Chen, X. Tang, T. Hirai
Jeffrey Dyck
ntype Ba filled skutterudites doped with Ni, Ba0.3Ni xCo4xSb12 with 0⩽x⩽0.2, have been synthesized and the Seebeck coefficient, thermal conductivity, electrical resistivity and Hall coefficient have been measured. ZT of 1.2 has been achieved at 800 K with x=0.05. The thermal conductivity data are fitted and the rattling effect of the Ba atoms is identified through a resonance scattering term. The Hall mobility is studied and a mixed scattering mechanism of acoustic phonons and ionized impurities based on a single, rigid band picture is presented. The role of Ni atoms in enhancing the ...
MultiFilling Approach For The Improvement Of Thermoelectric Properties Of Skutterudites., L. Chen, X. Tang, T. Kawahara, Jeffrey Dyck
MultiFilling Approach For The Improvement Of Thermoelectric Properties Of Skutterudites., L. Chen, X. Tang, T. Kawahara, Jeffrey Dyck
Jeffrey Dyck
Several skutterudite antimonides filled with atoms of different kinds, (Ba, M)yCo4Sb12 (M=Ce, La, Sr), have been synthesized by the combination of solid state reaction and melting methods. Thermal conductivity of (Ba,Sr)yCo4 Sb12 samples shows a behavior similar to that of BayCo4Sb12. Adding a small amount of Ce or La to the BayCo4Sb12 system is effective in further reducing the lattice thermal conductivity. The difference in the ionic radii of the two cofiller atoms is the most sensitive factor for scattering of phonons. The multifilled (Ba, M)yCo4Sb12 (M=Sr, Ce, La) show lower Seebeck coefficients as ...
HighTemperature Thermoelectric Properties Of NType Baynixco4Xsb12., X. Tang, L. Zhang, R. Yuan, L. Chen, T. Goto, T. Hirai, Jeffrey Dyck, W. Chen, C. Uher
HighTemperature Thermoelectric Properties Of NType Baynixco4Xsb12., X. Tang, L. Zhang, R. Yuan, L. Chen, T. Goto, T. Hirai, Jeffrey Dyck, W. Chen, C. Uher
Jeffrey Dyck
Effects of Ba filling fraction and Ni content on the thermoelectric properties of ntype BayNixCo4xSb12 (x = 00.1, y = 0.0.4) were investigated at temperature range of 300 to 900 K. Thermal conductivity decreased with increasing Ba filling fraction and temperature. When y was fixed at 0.3, thermal conductivity decreased with increasing Ni content and reached a minimum value at about x = 0.05. Lattice thermal conductivity decreased with increasing Ni content, monotonously (y â‰¤ 0.1). Electron concentration and electrical conductivity increased with increasing Ba filling fraction and Ni content. Seebeck coefficient increased with increasing temperature and ...