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Polar ionic media and stabilized charged species in organic synthesis ionic liquids derived from a biorenewable source, d-fructose, as a possible alternative to conventional organic reaction solvents /Okello, Maurice O. January 2004 (has links)
Thesis (Ph. D.)--State University of New York at Binghamton, Chemistry Department. 2004. / Includes bibliographical references.
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A PARAMETRIC STUDY OF THE PN JUNCTION C-V(G) CHARACTERISTIC OF THE GATE-CONTROLLED DIODE FOR USE AS AN IONIC CONCENTRATION SENSOR.Gerber, Donald Stuart. January 1983 (has links)
No description available.
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Release of meltwater and ionic solute from melting snowHarrington, Robert Franklin,1955. January 1997 (has links)
The release of ionic solute from melting seasonal snow produces an influx of ion laden water into hydrologic systems at the start of spring snowmelt. The spatial and temporal variability of meltwater and solute release from melting snow was investigated at different spatial scales to assess the magnitude and variability of this process. Four laboratory experiments were performed where an 0.4 m³ volume of snow was placed in a plexiglass box and melted from above. NaCl and dye tracer experiments revealed contemporaneous areas of concentrated dye and dilute meltwater in flow fingers, indicating that meltwater in preferential flow paths is diluted by low concentration water from the top of the snowpack. Meltwater discharge and meltwater electrical conductivity were measured in snow lysimeters, and snow accumulation and electrical conductivity of samples from snowpits were measured over four snowmelt seasons at an alpine field site. Peak snow-water equivalent ranged from 0.57 to 2.92 m, and lysimeter discharges ranged from 20 to 205% of the mean flow; however mean lysimeter flow was representative of snow ablation observed in snow pits. The electrical conductivity in snowpit samples and lysimeter meltwater averaged 2-3 μS cm⁻¹. Peak meltwater electrical conductivity ranged from 6 to 14 times that of the bulk premelt snowpack. The highest conductivities were observed during the first few days following the onset of flow, and the lysimeters that began flowing earliest tended to have the highest conductivities at the onset of flow. A mathematical model for solute transport in snow was developed that includes the effects of mass transfer between mobile and immobile liquid phases, advection, hydrodynamic dispersion, and melt—freeze episodes. The ability of the model to accurately simulate solute movement and release depends on the validity of the assumption of one—dimensional flow and on the accuracy of modeling the snowpack energy balance. This model is preferable to the empirical models of solute elution currently in use for investigations of watershed hydrogeochemical response because it has the ability to respond directly to changes in snow accumulation or meteorlogical conditions.
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Release of meltwater and ionic solute from melting snowHarrington, Robert Franklin, January 1997 (has links) (PDF)
Thesis (Ph. D - Hydrology and Water Resources) - University of Arizona. / Includes bibliographical references (leaves 206-216).
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Conformational studies of carboxymethylcellulose in aqueous saline solutions as a function of ionic strength /Marcera, Donna M. January 1990 (has links)
Thesis (M.S.)--Rochester Institute of Technology, 1990. / Typescript. "References": leaves 82-83.
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Electrochemical comparison and deposition of lithium and potassium from phosphonium- and ammonium-tfsi ionic liquidsVega, Jose A. January 2009 (has links)
Thesis (M. S.)--Chemical Engineering, Georgia Institute of Technology, 2009. / Committee Chair: Paul Kohl; Committee Member: Jiri Janata; Committee Member: Tom Fuller.
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Effective polarities for short range ionic interactions in aqueous solutions and micellar systemsDesai, Narendra R. January 1981 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1981. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 211-217).
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Transport properties, optical response and slow dynamics of ionic liquidsHu, Zhonghan. January 2007 (has links)
Thesis (Ph. D.)--University of Iowa, 2007. / Supervisor: Claudio J. Margulis. Includes bibliographical references (leaves 236-242).
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Electrons and ions in polar liquids /Gavlas, James Francis January 1974 (has links)
No description available.
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Development of an empirical force field and molecular dynamics simulation of N,N'-dialkylimidazolium ionic liquidsMusanur Abrar, Siraj 03 1900 (has links)
Thesis (MSc)--Stellenbosch University, 2004 / ENGLISH ABSTRACT: In an ongoing study an empirical force field that can correctly model N,N'-
dialkylimidazolium halide ionic liquids, the Imidazolium Ionic Liquid Force Field - IILFF,
was developed based on experimental data obtained from the Cambridge Structural Database
(CSD) and data calculated using Gaussian98.
Different conformations of the isolated cations were optimised at the Hartree-Fock
level using the 6-31G(d) basis set. Structural, vibrational and partial atomic charge data of the
lowest energy conformation of each cation were taken as observables during optimisation of
the force field parameters. Initial parameters of the IILFF were taken from existing force
fields and were optimised using the above mentioned data.
The IILFF was used to minimise isolated cations as well as crystals. These results were
successfully tested against isolated cations minimised using Gaussian98 and the experimental
crystals.
Finally, the melting process of the 1,3-dimethylimidazolium chloride crystal was studied
using an NPT ensemble starting from an ordered crystal cell and increasing the simulation
temperature beyond the experimental melting temperature. The IILFF was then used to
calculate the potential energy of the system. / AFRIKAANSE OPSOMMING: In 'n voortgaande studie om 'n empiriese kragveld te bou wat N,N' -dialkielimidasoliumhalied
ioniese vloeistowwe korrek kan modelleer is die Imidasolium Ioniese Vloeistof Kragveld
(nVK) ontwikkel. Die kragveld is ontwikkel gebasseer op eksperimentele data verkry uit die
Cambridge Strukturele Databasis (CSD) asook uit data vanaf Gaussian98 berekeninge.
Verskillende konformasies van die geïsoleerde katione is geoptimiseer deur middel van
Hartree Fock 6-31G(d) berekeninge. Strukturele data, asook vibrasies en gedeeltelike atoom
ladings van die laagste energie konformasie van elke katioon is gebruik as waarneembare
veranderlikes vir die bepaling van die optimale kragveld parameters. Beginwaardes vir die
nVK is geneem uit bestaande kragvelde en geoptimiseer met behulp van bogenoemde data.
Die IIVK is gebruik om geïsoleerde katione asook kristalle te minimiseer. Die resultate is
suksesvol getoets teen geïsoleerde katione wat met behulp van Gaussian98 geminimiseer is
en eksperimenteel bepaalde kristalle.
Laastens is die smeltproses van die 1,3-dimetielimidasolium chloried kristal bestudeer met
behulp van 'n NPT ensemble. Daar is begin by 'n geordende kristal en die simulasie
temperatuur is verhoog tot meer as die eksperimentele smeltpunt. Die IIVK is dan gebruik om
die potensiële energie van die sisteem te bepaal.
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