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  • 1
    Electronic Resource
    Electronic Resource
    On the hard sphere bridge function (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 7851-7852 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The bridge function for a simple fluid can be written as a diagrammatic expansion involving either the Mayer f-function f(r) or the total correlation function h(r). At each order, the h-bond expansion includes all f-bond diagrams to that order plus an infinite subset of higher order f-bond diagrams. Thus, taken to any order, the h-bond expansion is generally considered more accurate than the f-bond expansion. However, here we show that for hard spheres, the lowest order h-bond approximation for the bridge function is much less accurate than the corresponding f-bond approximation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463459
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  • 2
    Electronic Resource
    Electronic Resource
    Unexpected critical points in the nematic behavior of a reversibly polymerizing system (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 2780-2787 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A variety of amphiphilic molecules reversibly aggregate to form rod-like particles that spontaneously align at sufficiently high concentrations. A model combining a lattice description of excluded volume effects and a phenomenological description of aggregate assembly is used to calculate the phase behavior of such a system. An unexpectedly rich phase diagram is predicted with critical points dependent on end effects in the aggregates. When the aggregation is very weak, there is an apparent multicritical point in the isotropic–nematic transition. This situation applies to sickle cell hemoglobin and provides the first theoretical basis for the apparent critical point observed in that system. When aggregation is not quite so weak, a first-order nematic–nematic transition is predicted, either in addition to or merged with, the isotropic–nematic transition. The denser nematic phase contains extremely long, closely packed rods, suggestive of the hexagonal phase formed by cylindrical surfactant micelles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454010
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  • 3
    Electronic Resource
    Electronic Resource
    On the Born–Green–Yvon equation and triplet distributions for hard spheres (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 4301-4308 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The Born–Green–Yvon integral equation for hard spheres is studied using two closures which provide improvements to the traditional Kirkwood superposition approximation (KSA). These rigorous corrections to the KSA arise from a diagrammatic expansion of the triplet potential of mean force which can be carried out in terms of either the Mayer f-function or the total correlation function h. While the short-ranged f-bond corrections improve the calculated pair distribution function at contact, they otherwise distort this function and thus give very poor compressibility results. The long-ranged h-bond corrections are found to give overall improvement to the pair distribution function and, in particular, give nearly the correct phase of this function. Furthermore, the triplet distribution function computed with the second-order h-bond correction is found to be reasonably close to Monte Carlo results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463932
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  • 4
    Electronic Resource
    Electronic Resource
    Theory of amphiphilic liquid crystals: Multiple phase transitions in a model micellar system (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 528-538 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A variety of amphiphilic molecules reversibly and spontaneously self-assemble in aqueous solution forming a polydisperse population of asymmetric aggregates. In binary water/surfactant systems, aggregates may be either oblate or prolate and form corresponding orientationally ordered phases. Such binary systems are modeled using a lattice statistics calculation of the configurational entropy of a polydisperse collection of hard rods and plates, combined with a phenomenological description of aggregate assembly. Using parameter values relevant to micellar surfactant systems, a series of phase diagrams and associated particle size distributions have been computed. Depending upon the competition between rod and plate growth, the concentration dependent transition sequences I→A, I→P, and I→A→P (where I≡isotropic micellar, A≡axial nematic, and P≡planar nematic) are seen. The A→P transition occurs when rod and plate growth are equally favorable and is discussed in detail. Qualitative comparisons are drawn between the calculated phase behavior and experimental results. No stable biaxial nematic phases are predicted for binary systems in the absence of positional order.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457488
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  • 5
    Electronic Resource
    Electronic Resource
    Comment on "A modified superposition approximation to the three-body distribution function'' [J. Chem. Phys. 97, 5142 (1992)] (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 5625-5626 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Hernando and Gamba have recently proposed a simple modification to the Kirkwood superposition approximation which they suggest may be universally applicable to all simple fluids [J. Chem. Phys. 97, 5142 (1992)]. While this ansatz was shown to work well for a Lennard-Jones fluid we find it to be less than satisfactory for the hard sphere fluid, thus weakening the proposal of universality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465957
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  • 6
    Electronic Resource
    Electronic Resource
    OFFICIAL FOREIGN EXCHANGE INTERVENTION AS A COORDINATING SIGNAL IN THE DOLLAR–YEN MARKET (2005)
    550 Swanston Street (PO Box 378) Carlton South, Victoria 3053 Australia : Blackwell Publishing Asia Pty Ltd
    Pacific economic review 10 (2005), S. 0 
    Details
    ISSN: 1468-0106
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: Abstract.  I examine the effectiveness of exchange rate intervention within the context of a Markov-switching model for the real dollar–yen exchange rate over the period April 1991–December 2003. The probability of switching between stable and unstable regimes depends nonlinearly upon the amount of intervention, the degree of misalignment and the duration of the regime. I find that intervention increases the probability of stability when the rate is misaligned, and that its influence grows with the degree of misalignment. However, intervention within a small neighbourhood of equilibrium will result in a greater probability of instability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1468-0106.2005.00261.x
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  • 7
    Electronic Resource
    Electronic Resource
    Regulatory Uncertainty and the Volatility of Regional Electricity Company Share Prices: The Economic Consequences of Professor Littlechild (1998)
    Oxford, UK and Boston, USA : Blackwell Publishers Ltd
    Bulletin of economic research 50 (1998), S. 0 
    Details
    ISSN: 1467-8586
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: This paper attempts to measure the effects of regulatory intervention by measuring the conditional variance of stock price changes in the 12 UK regional electricity companies before and after an unexpected intervention by the electricity regulator in March 1995. The analysis uses an ARCH model in which the conditional variance follows an autoregressive formation. The results indicate a significant increase in the volatility of the conditional variance for eight of the 12 companies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1467-8586.00049
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  • 8
    Electronic Resource
    Electronic Resource
    Purchasing Power Parity (2003)
    Oxford, UK and Boston, USA : Blackwell Publishing Ltd.
    Review of international economics 11 (2003), S. 0 
    Details
    ISSN: 1467-9396
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: The paper provides a selective and critical review of the literature on purchasing power parity and real exchange rates, with special reference to the literature of the last two decades.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1467-9396.00394
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  • 9
    Electronic Resource
    Electronic Resource
    A model for nematic and columnar ordering in a self-assembling system (1990)
    s.l. : American Chemical Society
    Langmuir 6 (1990), S. 911-915 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00095a004
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  • 10
    Electronic Resource
    Electronic Resource
    Collapse of a polymer chain: A Born–Green–Yvon integral equation study (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 4835-4841 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A Born–Green–Yvon (BGY) type integral equation is developed for the intramolecular distribution functions of an isolated flexible polymer chain. The polymer is modeled as a linear array of n identical spherical interaction sites connected by universal joints of bond length σ. In particular we study chains composed of up to n=400 square-well spheres with hard-core diameters σ and well diameters λσ (1≤λ≤2). Intramolecular distribution functions and the resulting average configurational and energetic properties are computed over a wide range of temperatures. In the high temperature (good solvent) limit this model is identical to the tangent hard-sphere chain. With decreasing temperature (worsening solvent) the square-well chain undergoes a collapse transition identified by a sudden reduction in chain dimensions and a peak in the single chain specific heat. Extensive comparison is made between the BGY results and Monte Carlo results for square-well chains with λ=1.5. The BGY theory is extremely accurate for square-well 4-mers at all temperatures. For longer chains the theory yields reasonably accurate results for reduced temperatures greater than T*≈1 (expanded and theta states) and qualitatively correct behavior for T*〈1 (collapsed state). Very accurate values for the theta temperatures for square-well chains with 1.25≤λ≤2.0 are also obtained. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471178
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