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  • 1
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    Branching fraction measurement of J/ψ→KSKL and search for J/ψ→KSKS (2017)
    American Physical Society
    Details
    Publication Date: 2017-12-04
    Print ISSN: 2470-0010
    Electronic ISSN: 2470-0029
    Topics: Physics
    Published by American Physical Society
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Nonequilibrium molecular dynamics calculation of self-diffusion in a non-Newtonian fluid subject to a Couette strain field (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 2149-2158 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Molecular dynamics simulations have been performed on a simple fluid in the non-Newtonian regime in order to study the nature of diffusion in the presence of shear stress. The nonequilibrium molecular dynamics (NEMD) sllod algorithm is used to generate a homogeneous boundary driven Couette flow. The elements of the tensor of diffusion coefficients have been evaluated by three different routes: through Einstein relations with the corresponding elements of the tensor of molecule displacements, through Green–Kubo expressions involving tensor of momentum autocorrelation functions and cross-correlation functions, and by utilizing an NEMD color field method. All three routes to the tensor of diffusion coefficients are shown to yield consistent results. A simple spherically symmetric Lennard-Jones fluid at its triple point was used in the simulation study. We find that in a Couette strain field of sufficiently large strain rate, diffusion in all directions is enhanced substantially. We propose and verify a new asymptotic relationship between the diagonal elements of the tensor of diffusion coefficients and the strain rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459886
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  • 3
    Electronic Resource
    Electronic Resource
    Falling liquid film thickness measurement by an optical-electronic method (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 1883-1886 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An optical-electronic method was developed for measurement of falling liquid film thicknesses. The method is based on the postulate that a sheet light beam passing tangentially through a vertical liquid film on a cylinder will be blocked by the falling liquid film. Hence, when the beam is much wider than the film, the output of a photodiode probe which is located on the opposite side of the cylinder from the light source will be reduced by an amount proportional to the film thickness. The shadow of the transient film shape will also appear on a screen behind the falling film. Therefore, the variation of the amplitude of the film waves can be measured from the output of the photodiode and the average film thickness can be measured from pictures of the shadow using computer aided image analysis. The average film thickness measured agrees well with commonly accepted empirical equations. The maximum relative deviation between the experimental and calculated results is 18.5% with a standard deviation of 4.34×10−2 mm. Compared with popular conductance parallel-wire probes, this method has the advantages of convenience, noninvasive, higher spatial and temporal resolution, smaller hysteresis and it does not disturb the model's surface. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150557
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  • 4
    Electronic Resource
    Electronic Resource
    Reduced molybdenum-niobium oxides. 1. Synthesis, structure, and physical properties of K2Mo4Nb3O20 (1993)
    s.l. : American Chemical Society
    Inorganic chemistry 32 (1993), S. 4306-4310 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00072a025
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  • 5
    Electronic Resource
    Electronic Resource
    Free volume and ionic conductivity of poly(ether urethane)-LiClO4 polymeric electrolyte studied by positron annihilation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 334-338 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The positron lifetime spectra and ionic conductivity have been measured for poly(ether urethane)-LiClO4 polymeric electrolyte as a function of temperature. The glass transition temperature Tg, free-volume Vf, and fractional free-volume f were derived from the positron annihilation parameters. A correlation between fractional free-volume f(T) and conductivity σ above Tg, log[σ/σ(Tg)]=C1[f(T)−f(Tg)]/f[T], was first experimentally confirmed using measured positron annihilation results. The comparison of the value of the obtained constant C1 with the universal values for the segmental diffusion of amorphous polymers indicated that the critical free volume required for the ion transport is much smaller than that required for polymer chain segment mobility. Carrier transport and the segmental motion are discussed in terms of the free-volume theory. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359326
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  • 6
    Electronic Resource
    Electronic Resource
    Structure, Curie temperature, and magnetostriction of Sm1−xPrxFe2 alloys (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 6903-6905 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structure, Curie temperature, and magnetostriction of Sm1−xPrxFe2 alloys have been investigated using optical microscopy, x-ray diffraction, ac susceptibility, diffractometer step scanning and standard strain gauge techniques. It is found that the matrix of homogenized Sm1−xPrxFe2 alloys is the (Sm,Pr)Fe2 phase with MgCu2-type structure up to x=0.3, and the minor phases, both (Sm,Pr)Fe3, and rare earth-rich phase appear. The lattice parameter of the alloys increases slowly with increasing Pr content, but the Curie temperature goes the opposite way. The room temperature magnetostriction |λ(parallel)−λ⊥| and easy direction magnetostriction |λ111| of Sm1−xPrxFe2 alloys exhibit a peak near x=0.1. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363761
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  • 7
    Electronic Resource
    Electronic Resource
    Microstructure and magnetostriction for (Dy0.65Tb0.25Pr0.1) (Fe1−xAlx)1.8 alloys (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 2587-2589 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The microstructure, Curie temperature and magnetostriction of R(Fe1−xAlx)1.8 alloys (R=Dy0.65Tb0.25Pr0.1, x≤0.3) have been investigated using optical microscopy, x-ray diffraction, transmission electron microscopy, electron probe microanalysis, positron annihilation technique, vibrating sample magnetometer, and standard strain gauge technique. It was found that the alloys are essentially single phase up to x=0.30. The defects in R(Fe1−xAlx)1.8 decrease with increasing Al content when x≤0.1. The magnetostriction of the alloys decreases with increasing Al content in high applied magnetic fields, but it exhibits a peak when x=0.05 in low applied magnetic fields (H≤160 k A/m). © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361126
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  • 8
    Electronic Resource
    Electronic Resource
    Microstructure and magnetostriction of (Dy0.7Tb0.3)1−xPrxFe1.85 and (Dy0.7Tb0.3)0.7Pr0.3Fey alloys (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 3429-3431 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structure, Curie temperature, and magnetostriction of R1−xPrxFe1.85 and R0.7Pr0.3Fey (R=Dy0.7Tb0.3, x≤0.5, 1.55≤y≤1.85) alloys were investigated. The matrix of R1−xPrxFe1.85 alloys is the MgCu2-type cubic (Dy,Tb,Pr) Fe2 and the second phase was found to be (Dy,Tb,Pr) Fe3 when x≤0.3. When x〉0.4, (Dy,Tb,Pr)Fe3 is the main phase with the PuNi3-type structure and (Dy,Tb,Pr) Fe2 becomes the minority phase. In the range of 0.3〈x≤0.4, both MgCu2- and PuNi3-type structures coexist. The R0.7Pr0.3Fey alloys contain a small amount of (Dy,Tb,Pr) Fe3 phase when y〉1.55, which increases with increasing y. When y=1.55, the alloy is essentially single phase with the MgCu2-type cubic structure. The lattice parameter of (Dy,Tb,Pr)Fe2 compound for R1−xPrxFe1.85 alloys increases slowly with increasing x when x≤0.3, and sharply increases when x〉0.3. The Curie temperature of the alloys decreases steadily with increasing Pr content. The magnetostrictions of R1−xPrxFe1.85 and R0.7Pr0.3Fey alloys decrease with increasing Pr content and Fe content, respectively. The largest magnetostriction at room temperature was found in the alloy R0.7Pr0.3Fe1.55 (1480×10−6 at H=796 kA/m). © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117282
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  • 9
    Electronic Resource
    Electronic Resource
    Light invariant, efficient, multiple band gap AlGaAs/Si/metal hydride solar cell (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 4055-4057 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electronic and ionic charge transfer provides a basis for composite semiconductor/electrolyte systems featuring simultaneous solar/electrical conversion and solar energy storage. This cell contains both multiple band gap and electrochemical storage, and provides a nearly constant energetic output in illuminated or dark conditions. Multiple semiconductor band gaps can enhance the energetics of this interaction. The cell combines bipolar AlGaAs (Eg=1.6 eV) and Si (Eg=1.1 eV) and AB5 metal hydride/NiOOH storage, and generates a light variation insensitive potential of 1.2–1.3 V at total (including storage losses) solar/electrical energy conversion efficiency of 18.1%. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123259
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  • 10
    Electronic Resource
    Electronic Resource
    Chemical interactions at Ta/fluorinated polymer buried interfaces (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 1846-1847 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this letter, we study Ta/parylene-F (PA–F) buried interfaces using x-ray photoelectron spectroscopy. We found that the Ta–F bond was formed at the Ta/PA–F interface after depositing a layer of thin Ta film (〈50 Å). For the Ar+ or O2 plasma pretreated PA–F surface, in addition to the Ta–F bond, a Ta–C bond was observed at the buried interface after Ta metallization. The Ta–C bond may be responsible for the enhancement of Ta/PA–F adhesion. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.121202
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