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Factors affecting diffusion of atmospheric fluorocarbons into unsaturated porous materialsEarp, Douglas E. (Douglas Eugene) January 1981 (has links)
No description available.
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THE ADSORPTION OF METHANOL VAPOR ON SILVER-IODIDEEdwards, Harry W. (Harry Wallace), 1939- January 1966 (has links)
No description available.
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THE THERMODYNAMICS OF THE ADSORPTION OF ARGON ON ANATASEGlossman, Norton, 1935- January 1964 (has links)
No description available.
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Measurement of diffusion and adsorption in porous adsorbentsNarayan, Shankar B. January 1985 (has links)
No description available.
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Electrochemical and PM-IRRAS studies of the interaction of plasma protein fibrinogen with a biomedical-grade 316LVM stainless steel surfaceDesroches, Marie-Josée. January 2007 (has links)
It is widely accepted that the initial event that significantly influences biocompatibility is the nearly instantaneous adsorption of proteins from biological fluids onto the biomaterial surface. For blood-contacting devices, the complex layer of adsorbed plasma proteins is generally unfavourable and leads to major complications, including thrombus formation, inflammatory tissue responses, and microbial infections. Furthermore, protein interaction with passive films on metallic biomaterial surfaces may contribute to enhanced in vivo corrosion. To gain a better understanding of this phenomenon, the present thesis investigated the fundamental aspects of the interaction of the serum protein fibrinogen with a medical-grade stainless steel 316LVM surface using electrochemical and IR spectroscopy techniques. Aspects of this interaction included the thermodynamics and kinetics of fibrinogen adsorption, the effect of fibrinogen adsorption on the corrosion behavior of 316LVM stainless steel, and the conformational changes of fibrinogen upon its adsorption onto the stainless steel surface. / It was shown that fibrinogen readily adsorbs onto the 316LVM stainless steel surface. Increases in the bulk protein concentration resulted in a corresponding increase of the surface coverage, a dependence that was described by the Langmuir isotherm. Large, negative values of the calculated Gibbs energy of adsorption indicated a highly spontaneous and strong adsorption of fibrinogen onto the 316LVM stainless steel at all investigated temperatures. Although the adsorption process was shown to be endothermic under the applied experimental conditions, the primary driving force for the adsorption process was found to be the positive entropy gain that arises from structural loss and/or rearrangement of the protein upon adsorption, as well as dehydration of the protein and stainless steel surface during the adsorption process. Kinetic measurements indicated that fibrinogen adsorption occurs rapidly. / It was determined that for short contact times (1 hour), the addition of fibrinogen to the electrolyte enhanced the corrosion rate of the 316LVM stainless steel at the open circuit potential. For longer contact times (24 hours), an increase in the polarization resistance values was obtained, indicating an enhanced corrosion resistance of the material. It was postulated that the protein was not capable of complexing the well-stabilized passive film, and instead remained adsorbed to form a protective barrier to diffusion of oxygen-containing species from the electrolyte to the stainless steel surface. / The secondary structure of the surface-adsorbed fibrinogen molecules was investigated by modeling the experimental PM-IRRAS spectra. It was shown that the protein lost a certain extent of its secondary structure upon adsorption to the steel surface. Fibrinogen molecules adsorbed from more dilute solutions were also shown to possess a lower alpha-helical content than those adsorbed from more concentrated solutions, suggesting they laid on the stainless steel surface in a more linear configuration.
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A relationship between inclusion content of soils and saturated hydraulic conductivity in laboratory tests /Dunn, Anita Jean Austin. January 1983 (has links)
No description available.
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The absorption of sulfur dioxide by water droplets during condensationWills, Thomas Lowell 12 1900 (has links)
No description available.
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The absorption of oxygen by water droplets during condensationOliver, Manuel Jorge 08 1900 (has links)
No description available.
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Mass transfer of sulfur dioxide to growing cloud dropletsSchirmer, William 12 1900 (has links)
No description available.
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Mobilizationpurging of aqueous metal ions into supercritical carbon dioxideAger, Patrick. January 1998 (has links)
The technology of supercritical fluid extraction (SFE) offers the opportunity to efficiently extract both relatively non-polar analytes as well as ionic materials (such as metal ions) that can be mobilized with the addition of complexing reagents. The nebulizer of a conventional flame atomic absorption spectrometer (FAAS) was modified to extend the range of metals amenable to on-line detection. The flow injection thermospray-FAAS (FI-TE-FAAS) interface provided efficient detection for a variety of less volatile elements (Co, Cr(III), Cr(VI), Fe, Ni, Mn and Al) present as ions in aqueous media or as complexes in the supercritical fluid (SC-CO2) carrier phase. The range of possible metal analytes that can be monitored has been increased over the nine elements (Ag, As, Cd, Cu, Hg, Mn, Pb, Se and Zn) that could be detected with an all-silica interface. The acetylacetonate complexes offered considerable potential for metal detection in an SC-CO2 carrier phase. Limits of detection (LODs) were used to compare the instrument responses to different metals. (Abstract shortened by UMI.)
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