Publications

1993
D. G. Peck and Johnston, K. P., “PREDICTION OF INTERFACIAL PROPERTIES IN MICROEMULSIONS - THE LATTICE FLUID SELF-CONSISTENT-FIELD THEORY,” Journal of Physical Chemistry, vol. 97, pp. 5661-5667, 1993. Publisher's VersionAbstract
A lattice fluid self-consistent field theory is used to calculate both the composition and fundamental thermodynamic properties, i.e., the interfacial tension (gamma) and bending moment (c), of spherical interfaces between oil and water. The variation in density throughout the interface is treated by the inclusion of holes in the lattice. This molecular theory is inserted into new classical thermodynamic expressions for gamma and c which take into account the fact that the surfactant tails are anchored to an interface. The detailed description of the composition throughout the interface provides a means to understand the effect of density and radius on the bending moment. The natural curvature and interdroplet interactions are calculated for water-in-propane microemulsions formed with the surfactant Aerosol-OT and compared with experiment.
B. P. Dedeitch, Machemehl, R. B., Euritt, M. A., Harrison, R., and Walton, C. M., “RELIABILITY OF TOLL ROAD REVENUE FORECASTS FOR SELECTED TOLL ROADS IN THE UNITED STATES. INTERIM REPORT”. 1993.Abstract
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B. I. Dvorak, Lawler, D. F., Speitel Jr, G. E., Jones, D. L., and Boadway, D. A., “Selection Among Treatment Technologies for Waters Contaminated with Synthetic Organic Chemicals,” Water Environment Research, vol. 65, no. 7, pp. 827-838, 1993.
J. F. Bard, Venkatraman, K., and Feo, T. A., Single Machine Scheduling with Flow Time and Earliness Penalties. Journal of Global Optimization 3, 1993, pp. 289–309.
R. B. Gupta, Combes, J. R., and Johnston, K. P., “SOLVENT EFFECT ON HYDROGEN-BONDING IN SUPERCRITICAL FLUIDS,” Journal of Physical Chemistry, vol. 97, pp. 707-715, 1993. Publisher's VersionAbstract
A pronounced solvent effect on the hydrogen bonding of methanol and triethylamine is observed throughout the gas, supercritical, and liquid states in the relatively inert solvent SF6, based on FTIR spectroscopy. The free energy of hydrogen bonding is stabilized by a decrease in density; i.e., the donor and acceptor are destabilized more than the complex as the solvation is reduced. Also, the hydrogen bond energy becomes stronger. A hydrogen-bonding lattice-fluid (LFHB) model is extended to treat this density dependence, and the calculations are in reasonable agreement with experiment. Near the mixture critical point, the number of hydrogen bonding encounters between the donor and acceptor is enhanced due to solute-solute clustering as expected on the basis of previous experimental and computer simulation studies.
A. I. Cooper, Howdle, S. M., Hughes, C., Jobling, M., Kazarian, S. G., Poliakoff, M., Shepherd, L. A., and Johnston, K. P., “SPECTROSCOPIC PROBES FOR HYDROGEN-BONDING, EXTRACTION IMPREGNATION AND REACTION IN SUPERCRITICAL FLUIDS,” Analyst, vol. 118, pp. 1111-1116, 1993. Publisher's VersionAbstract
Spectroscopy is used for monitoring a number of processes relevant to solution, extraction and impregnation in supercritical CO2 (scCO2). Examples include: a combined infrared (IR) and ultraviolet study of the interaction between para-hydroquinone (HQ) and tributyl phosphate in scCO2, which reveals hydrogen bonding, detected by the characteristic nu(O-H) IR bands; IR measurement of the solubility of CpMn(CO)3 (CP = eta5-C5H5) in SCCO2 as a function of temperature and pressure; an investigation of the uniformity of supercritical impregnation of CpMn(CO)3 into 4 mm diameter pellets of polyethylene (PE) using Fourier-transform infrared (FTIR) microscopy and FTIR depth profiling by photoacoustic detection; and an IR study of the photochemical reaction of CpMn(CO)3 with N2 with PE film.
T. Rioux, Inman, R., Machemehl, R. B., and Lee, C. L., “Texas model for intersection traffic-additional features,” 1993.Abstract
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T. Rioux, Inman, R., Machemehl, R. B., and Lee, C. E., “TEXAS MODEL FOR INTERSECTION TRAFFIC–ADDITIONAL FEATURES. FINAL REPORT”. 1993.Abstract
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S. H. Page, Sumpter, S. R., Goates, S. R., Lee, M. L., Dixon, D. J., and Johnston, K. P., “TRI-N-BUTYLPHOSPHATE/CO2 AND ACETONE/CO2 PHASE BEHAVIORS AND UTILITIES IN CAPILLARY SUPERCRITICAL-FLUID CHROMATOGRAPHY,” Journal of Supercritical Fluids, vol. 6, pp. 95-101, 1993. Publisher's VersionAbstract
Because the phase behavior of the mobile phase must be known before conclusions fr-om supercritical-fluid chromatography (SFC) can be considered reliable, the phase behaviors of tri-n-butylphosphate/CO2 and acetone/CO2 were thoroughly determined in a variable-volume view cell at conditions applicable to SFC (0-20 mol % modifier, 25-140 degrees C, and 80-415 atm). The chromatographic utilities of the binary fluids were determined with test compounds (condensed tannins and steroids). Although the UV-absorbance detector base-line rise was severe with acetone/CO2, chromatographic performance was not compromised. Standard base-line correction methods were used to produce conventional-looking chromatograms. The chromatographic performance with tri-n-butylphosphate/CO2 was unsatisfactory (erratic retention). Static restrictors (integral, frit, crimped Pt/Ir, linear, and valves) produced erratic flow. Heating the restrictors to 250-400 degrees C did not improve performance. Reasons for the compromise in chromatographic performance are proposed.
1992
J. F. Bard and Moore, J. T., An Algorithm for the Discrete Bilevel Programming Problem. Naval Research Logistics 39 419-435, 1992.
T. A. Edmunds and Bard, J. F., An Algorithm for the Mixed-Integer Nonlinear Bilevel Programming Problem. Annuals of Operations Research 34 149-162, 1992.
J. F. Bard, Dar-El, E., and Shtub, A., An Analytic Framework for Sequencing Mixed Model Assembly Lines. International Journal of Production Research 30(1), 1992, pp. 35–48.
J. W. Clark, Gazula, S., Gernoth, K. A., Hasenbein, J., Prater, J., and Bohr, H., “Collective computation of many-body properties by neural networks,” Recent Progress in Many-Body Theories, vol. 3, pp. 371-386, 1992.
J. F. Bard, A Comparison of the Analytic Hierarchy Process with Multiattribute Utility Theory: A Case Study. IIE Transactions 24(5), 1992, pp. 111–121.
Y. Shoham, Morrison, H. F., and Torres-Verdín, C., “Electromagnetic mapping of electrical conductivity beneath the Columbia basalt (Expanded Abstract): Eur,” European Assotiation Geoscientists & Engineers 54rd Annual International Meeting. European Assotiation. Geoscientists. & Engineers, Paris, France, 1992.
Y. Shoham, Morrison, H. F., and Torres-Verdín, C., “Electromagnetic mapping of electrical conductivity beneath the Columbia basalt (Expanded Abstract): Eur,” European Assotiation Geoscientists & Engineers 54rd Annual International Meeting. European Assotiation. Geoscientists. & Engineers, Paris, France, 1992.
Z. Zhang, Claros, G., and Hudson, W. R., “An Expert System for Diagnosis and Treatment of Flexible Pavement Distress,” 71st Annual Meeting of the Transportation Research Board. Washington, DC, 1992.
P. D. Condo, Sanchez, I. C., Panayiotou, C. G., and Johnston, K. P., “GLASS-TRANSITION BEHAVIOR INCLUDING RETROGRADE VITRIFICATION OF POLYMERS WITH COMPRESSED FLUID DILUENTS,” Macromolecules, vol. 25, pp. 6119-6127, 1992. Publisher's VersionAbstract
A model is presented to predict the depression of the glass transition temperature of a polymer in the presence of a liquid, gas, or supercritical fluid as a function of pressure. It is developed using lattice fluid theory and the Gibbs-Di Marzio criterion, which states that the entropy is zero at the glass transition. Four fundamental types of T(g) versus pressure behavior are identified and interpreted as a function of three factors: the solubility of the compressed fluid in the polymer, the flexibility of the polymer molecule, and the critical temperature of the pure fluid. A new phenomenon is predicted where a liquid to glass transition occurs with increasing temperature, which we define as retrograde vitrification. This retrograde behavior is a consequence of the complex effects of temperature and pressure on sorption. For the limited data which are available for the polystyrene-CO2 and poly(methyl methacrylate)-CO2 SYStems, the predictions of the model are in good agreement with experiment.
C. Torres-Verdín and Bostick Jr, F. X., “Implications of the Born approximation for the magnetotelluric problem in three-dimensional environment,” Geophysics, vol. 57, pp. 587–602, 1992.
C. Torres-Verdín and Bostick Jr, F. X., “Implications of the Born approximation for the magnetotelluric problem in three-dimensional environment,” Geophysics, vol. 57, pp. 587–602, 1992.

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