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in subjects: "Solutes"  
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Femtosecond transient dichroism/birefringence studies of solute- solvent friction and solvent dynamics

Description: Ultrafast, heterodyne, polarization spectroscopies are used to measure solute-solvent frictional coupling and characterize the neat solvent`s relaxation dynamics on femtosecond and picosecond timescales.
Date: February 1, 1994
Creator: Chang, Y. J.; Castner, E. W. Jr.; Konitsky, W. & Waldeck, D. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Numerical simulation of coupled flow and transport with TOUGH2: A verification study

Description: We have tested T2DM, the dispersion module of TOUGH2, on two classic flow problems: (1) the seawater intrusion problem of Henry (1964); and (2) the pure solutal free convection problem of Elder (1967). T2DM produces results in agreement with prior work for similar spatial discretizations. In the Henry problem, finer spatial discretization allows the seawater tongue to penetrate slightly farther without affecting the overall flow dynamics. In the strongly coupled pure solutal free convection pro… more
Date: October 1, 1994
Creator: Oldenburg, C. M. & Pruess, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Photoinduced dipoles and charge pairs in condensed phase. Progress report, November 14, 1993--November 15, 1994

Description: Efforts during the past year centered on expanding the understanding of the photocurrent transients produced by photoinduced dipoles in solution. In addition to exploring intramolecular charge transfer in a molecule which exhibits a giant dipole, the authors began an intensive look at intermolecular electron transfer between photoexcited electron donors and acceptors. The three projects which are farthest along are described in abstract form in the paragraphs which follow. The first makes use o… more
Date: December 31, 1994
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Lagrangian-Eulerian finite element method with adaptive gridding for advection-dispersion problems

Description: In the present paper, a Lagrangian-Eulerian finite element method with adaptive gridding for solving advection-dispersion equations is described. The code creates new grid points in the vicinity of sharp fronts at every time step in order to reduce numerical dispersion. The code yields quite accurate solutions for a wide range of mesh Peclet numbers and for mesh Courant numbers well in excess of 1.
Date: February 1, 1994
Creator: Ijiri, Y. & Karasaki, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Determination of solvation kinetics in supercritical fluids. Project summary, August 15, 1993--May 3, 1994

Description: This project is directed on determining effects of supercritical fluids on salvation and chemical reactions. Sub-projects are: understanding the effects of neat and entrainer-modified supercritical fluids on solute-fluid interactions; determining the influence of supercritical fluids on energetics and dynamics of solute conformation; and probing effects of continuous phase density on internal dynamics of reverse micelles formed in supercritical fluids. In order to follow these fast molecular-le… more
Date: August 1, 1994
Creator: Bright, F. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Modeling small-scale physical non-equilibrium and large-scale preferential fluid and solute transport in a structured soil

Description: The deviation of non-reactive solute transport from that predicted by classical convection-dispersion equations is usually attributed to physical non-equilibrium caused by small- and large-scale pore structures in porous media. Diffusion of fluid and solute into micropores or rock matrix may occur locally, while fluid and solutes can also be channeled preferentially through interconnected macropores or fractures. A multiple-pore-region (MPR) approach with local advective-diffusive mass exchange… more
Date: September 1, 1994
Creator: Gwo, J. P.; Jardine, P. M.; Wilson, G. V. & Yeh, G.-T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Spectrochemical Investigation of Preferential Solvation. 2. Compatibility of Thermodynamic Models versus Spectrofluorometric Probe Methods for Tautomeric Solutes Dissolved in Binary Mixtures

Description: Article discussing spectrochemical investigations of preferential solvation and the compatibility of thermodynamic models versus spectrofluorometric probe methods for tautomeric solutes dissolved in binary mixtures.
Date: March 1, 1994
Creator: Acree, William E. (William Eugene); Wilkins, Denise C.; Tucker, Sheryl A. (Sheryl Ann); Griffin, Jason M. & Powell, Joyce R.
Item Type: Refine your search to only Article
Partner: UNT College of Arts and Sciences
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INTRAVAL Phase 2: Modeling Testing at the Las Cruces Trench Site

Description: Several field experiments have been performed by scientists from the University of Arizona and New Mexico State University at the Las Cruces Trench Site to provide data tc test deterministic and stochastic models for water flow and solute transport. These experiments were performed in collaboration with INTRAVAL, an international effort toward validation of geosphere models for the transport of radionuclides. During Phase I of INTRAVAL, qualitative comparisons between experimental data and mode… more
Date: January 1, 1994
Creator: Hills, R. G.; Wierenga, P. J.; Luis, S.; McLaughlin, D.; Rockhold, M.; Xiang, J. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Simultaneous transport of synthetic colloids and a nonsorbing solute through single saturated natural fractures

Description: Tracer transport experiments involving colloids that showed little tendency to attach to rock surfaces and a nonsorbing solute (iodide) -were conducted in three different well-characterized natural fractures in tuff. The colloids always arrived earlier in the effluent than the iodide, which we believe is evidence of (1) hydrodynamic chromatography and/or (2) the fact that the colloids experience a smaller effective volume in the fracture because they diffuse too slowly to enter low-velocity reg… more
Date: September 1, 1994
Creator: Reimus, P. W.; Robinson, B. A.; Nuttall, H. E. & Kale, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Structure from solute-solvent interactions in supercritical polyatomic molecular mixtures

Description: Solute-solvent and solute-solute microstructures at the sueprcritical state are important in elucidating chemical reaction and spectroscopic data. We can classify the range of pair correlations into two regions: a short range (r {le} r{sub min}) and a long range (r from r{sub min} to 20 {approximately} 50 molecular diameters). The often cited local density enhacement referes to the short range corelations and is shown not to be related to the critical behavior of the mixture. The long-range beh… more
Date: December 31, 1994
Creator: Lee, L.L. & Cochran, H.D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Willamette Oxygen Supplementation Studies : Annual Report 1994.

Description: Hydropower development and operations in the Columbia River basin have caused the loss of 5 million to 11 million salmonids. An interim goal of the Northwest Power Planning Council is to reestablish these historical numbers by doubling the present runs from 2.5 million adult fish to 5.0 million adult fish. This increase in production will be accomplished through comprehensive management of both wild and hatchery fish, but artificial propagation will play a major role in the augmentation process… more
Date: September 1, 1994
Creator: Ewing, R.D.; Ewing, S.K. & Sheahan, J.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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