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  • 1
    Electronic Resource
    Electronic Resource
    Equilibrium polymerization and gelation. I. Integral-equation theory (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 5167-5171 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This is the first of a series of papers on the application of Wertheim's multidensity formalism to study the connectivity and related properties of equilibrium polymerizable particles. We first consider in detail the case in which each monomer has two sites available for covalent bonding. We modify Wertheim's treatment to apply it to the case where the two sites on a monomer are indistinguishable, i.e., to homofunctional units. A study is presented of the connectedness behavior in these systems, including expressions for the weight-average molecular weight and cluster size. The application of these results to specific models is reported in subsequent parts of this series.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467372
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  • 2
    Electronic Resource
    Electronic Resource
    High-temperature and -pressure system for laser Raman spectroscopy of aqueous solutions (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 2247-2253 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A high-temperature, high-pressure experimental system is presented that is compatible with a state-of-the-art laser Raman spectrometer. The apparatus and associate electronics and valving, which allow Raman spectra acquisition from ambient conditions to 500 °C and 1-kbar pressure in corrosive aqueous solutions, are described. Diamond windows and a titanium bodied optical design are used to obtain these conditions. Automatically controlled heating jackets have been built that allow ±0.4 °C temperature stability over this range. Raman spectra are presented that demonstrate the capabilities of this experimental apparatus for aqueous studies as a function of temperature and pressures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139942
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  • 3
    Electronic Resource
    Electronic Resource
    Study of weak magnetism effects in heavy-electron systems by μ+SR (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5639-5639 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We will present results from μ+SR investigations of the heavy-electron systems CeAl3, U2Zn17, UCu5, and UCd11. The latter three are known to order antiferromagnetically at low temperatures. The transition into the antiferromagnetic phase is clearly manifest in the μ+SR data, but also above the Néel temperatures some weak magnetism seems to persist as can be inferred from enhanced μ+ relaxation rates even in zero applied field. The involved effective moments are much reduced in comparison to the free-ion f moments, generally below 0.5 μB, and the magnetic order may be of the spin-glass or spin-density wave type. In nonmagnetic CeAl3 a spontaneous μ+ precession signal appears below 0.7 K in zero external field which implies the presence of even some coherent magnetic order of probably very short range in this system. These findings are consistent with other recent μ+SR and neutron scattering work, indicating that weak magnetic mechanisms seem to be a characteristic feature of heavy-electron systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342281
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  • 4
    Electronic Resource
    Electronic Resource
    Clustering and percolation for dimerizing penetrable spheres (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 8365-8373 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Wertheim's dual density formalism is applied to study the percolation behavior of dimerizing permeable spheres. The model is that of permeable spheres introduced by Blum and Stell as a generalized potential having ideal-gas (randomly centered) spheres as one limit and Percus–Yevick hard spheres as the other. Both thermodynamic results (pressure and site–site pair-correlation functions) and connectivity results (percolation threshold and site–site pair-connectedness functions) are determined for mixtures of dumbbells and spheres as a function of the penetrability factor ε, the bond length L and the fraction x1 of spheres forming dumbbells. A critical bond length L=0.553 was found for which the percolation threshold is independent of the amount of dimerization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461264
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  • 5
    Electronic Resource
    Electronic Resource
    Blowout bifurcations and the onset of magnetic dynamo action : The 42nd annual meeting of the division of plasma physics of the American Physical Society and the 10th international congress on plasma physics (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 1944-1952 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper numerically investigates the magnetohydrodynamic equations in three dimensions with periodic boundary conditions in a parameter range where a forced fluid flow is chaotic. It is found that the transition to dynamo action, whereby the magnetic field is sustained by interaction with the forced flow, is a blowout bifurcation. The blowout bifurcation is typified by bursting behavior, or "on-off intermittency." In particular, near the transition there are short, intermittently occurring bursts of strong magnetic field activity where the total magnetic energy is comparable to the total flow kinetic energy. Between these bursts the magnetic energy is very small. As one approaches the transition from the dynamo-active side, the time between bursts becomes longer and longer, approaching infinity at the transition. Numerical verification is given for the presence of signature scaling laws in numerical computations utilizing a pseudospectral model with triply periodic boundary conditions. This work implies specific testable predictions for experimental dynamos. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1342228
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  • 6
    Electronic Resource
    Electronic Resource
    Metallic glass matrix composite with precipitated ductile reinforcement (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 81 (2002), S. 1020-1022 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report a composite material consisting of precipitated micron-scale Ta-rich solid solution particles distributed in a bulk metallic glass matrix. The reinforcing ductile particles are precipitated during melting of the master alloy of glass-forming (Zr70Ni10Cu20)82Ta8Al10, by using previously prepared metastable Zr–Ta solid solution binary ingots. Upon cooling from the melt, the matrix undergoes a glass transition to produce an amorphous phase while the particles of precipitated Ta solid solution are distributed in the glass matrix. The resulting material not only shows high strength (∼2.1 GPa), but also has dramatically enhanced plastic strain to failure in uniaxial compression relative to single-phase bulk metallic glasses. The composite also displays limited tensile ductility. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1498864
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  • 7
    Electronic Resource
    Electronic Resource
    Raman spectra and calculated vibrational frequencies of size-selected C16, C18, and C20 clusters (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 9652-9655 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The surface plasmon polariton-enhanced Raman spectra of size-selected C16, C18, and C20 clusters isolated in nitrogen matrices are presented along with the calculated vibrational frequencies for the ring and linear chain isomers. The Raman spectra, recorded at a range of excitation wavelengths from 457.9 to 670 nm, show strong resonance enhancement for the three clusters. The calculated vibrational frequencies for ring and linear chain isomers and the cage and bowl structures for C20 are compared to the experimental frequencies. Systematic shifts in the series of peaks in the 200 cm−1 region for C16, C18, and C20 suggest that the observed isomers have the same geometry, thereby ruling out the bowl and cage isomers for C20. The measured spectra appear to be most consistent with the linear chain isomer. This high-energy isomer may be produced during neutralization of the deposited cluster ions. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477632
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  • 8
    Electronic Resource
    Electronic Resource
    Current-biased superconducting strips as position-sensitive particle detectors (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 2231-2243 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The feasibility of superconducting strips as position-sensitive detectors for α particles was investigated. For this purpose films have been prepared of different materials and dimensions using standard evaporation and laser ablation in an UHV system. Films were patterned into strips and current-biased strips were irradiated with 5.5 MeV α particles. The energy deposited by the particle in the strip creates a normal-conducting region, which in turn causes a voltage drop. The time evolution of the voltage drop across the strip as a function of bath temperature and bias current has been investigated. Information about the site of the strip hit by the α particle was obtained from monitoring the propagating normal-conducting zones. A lateral position sensitivity of ±30 μm for a tantalum strip detector has been achieved. The propagation of normal-state zones in the strip cannot provide information on the energy of the particle. A model describing the time evolution of a normal-conducting zone in a current-biased superconducting strip was used to test and interpret the experimental results and allows one to estimate the thermal conductivity of the strip material and the heat transfer from the strip into the substrate. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358810
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  • 9
    Electronic Resource
    Electronic Resource
    Doping and pressure studies on YbBiPt : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5415-5417 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The compound YbBiPt exhibits an extremely large low-temperature C/T (γ∼8 J K−2 mol−1/Yb) which, if due solely to a renormalized effective mass, would make this material the heaviest correlated electron system known to date. In the Kondo model, the very large γ corresponds to a small characteristic energy scale that is expected to be pressure dependent. We have studied the effect of chemical pressure on YbBiPt single crystals by heat-capacity measurements on Y and Lu-doped samples. We have also made preliminary low-temperature measurements under hydrostatic pressure of the heat capacity (300 mK≤T≤2 K, up to 8 kbar) and resistance (30 mK≤T≤1 K, at 16 kbar).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353700
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  • 10
    Electronic Resource
    Electronic Resource
    Connections between magnetism and superconductivity in UBe13 doped with thorium or boron (invited) : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5782-5787 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetism and superconductivity appear to be intimately connected in the heavy electron (HE) superconductors. For example, it has been conjectured but not proven that the exchange of antiferromagnetic spin fluctuations are responsible for pairing in HE superconductors. In this paper we review recent results in U1−xThxBe13, where specific heat, lower critical field, and zero-field muon-spin-resonance (μSR) measurements reveal another second-order phase transition (below the superconducting transition) to a state which possesses small-moment magnetic correlations for 0.019≤x≤0.043. We present a new phase diagram for (U,Th)Be13 which indicates that the superconducting and magnetic order parameters are closely coupled. A discussion of the nature of the lower phase is presented, including the consideration of a possible magnetic (time-reversal-violating) superconducting state. When UBe13 is doped with B (UBe12.97B0.03) the Kondo temperature is decreased and the specific heat jump at the superconducting transition temperature is significantly enhanced. However, μSR measurements reveal no magnetic signature in UBe12.97B0.03, unlike the case for Th doping. The correlation between changes in the Kondo temperature and changes in the superconducting properties induced by B doping provide evidence for the importance of magnetic excitations in the superconducting pairing interaction in UBe13.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350160
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