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Showing 1 to 12 of 12 for “"activation volumes"”.
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Activation volumes of carbon diffusion in F.C.C. iron-nickel alloys
… technique was used to determine the activation volume of carbon diffusion, ΔV, in six fcc iron-nickel alloys. Measurements were made at temperatures ranging from 68ºC to 90ºC and pressures up to six kilobars on samples having a nickel content between 31 and 63 at. %. A maximum …
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High Pressure Effects on the Dynamics and Kinetics of Two Model Biochemical Systems
… NMR inversion transfer, and the apparent activation volumes of exchange determined. Hydrogen exchange between NMA and water serves as a model for amide-water hydrogen exchange in peptides and proteins which is sensitive to the local environment of the protons and is used to probe …
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The Effect of Hydrostatic Pressure on The Ionic Conductivity of Some Crystals With The Fluorite Structure
… temperatures up to near the melting point. The activation volumes for extrinsic vacancy motion were obtained from the effect of pressure on the conductivity of doped and oxygen contaminated samples. The formation volumes of intrinsic defects were calculated from measured activation volumes at …
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The effect of hydrostatic pressure on the ionic conductivity of some crystals with the flourite structure
… temperatures up to near the melting point. The activation volumes for extrinsic vacancy motion were obtained from the effect of pressure on the conductivity of doped and oxygen contaminated samples. The formation volumes of intrinsic defects were calculated from measured activation volumes at …
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Variable Pressure Nuclear Magnetic Resonance Studies of Ionic Liquids and Electrophoretic Probe Design
… and pressure to obtain parameters such as activation energies and activation volumes respectively. In this work, studies of ionic liquids and polycarbonates are presented and the design and fabrication of cells used in the study of NMR under an electric field. </p>
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The effect of high pressure on self-diffusion in beta-titanium
… to decrease with pressure, indicating a positive activation volume. This result is in contradiction of earlier reports of negative activation volumes for diffusion of Fe in S-Ti and U in y-U. The value obtained for the activation volume for self-diffusion in S-Ti is approximately 3.6 ± 1.0 …
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Effect of pressure on ionic conductivity in rubidium silver iodide and silver iodide
… samples, up to pressures of 6 kbar. The activation volumes for motion in cr-RbAg4I5 and B-RbAgI5, respectively, are -0.4 ±.2 cm3/mole and -0.2 ±.l cm3/mole. In 4a-AgI, the motion volume increases from 0.56 ±.l cm3 /mole at 435 K to 0.8 ±.l cm3/mole at 623 K. These values are unusually …
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Elevated temperature mechanical properties of line pipe steels
… components of the flow stress and apparent activation volumes. Torsional pendulum experiments were performed to measure internal friction carbon Snoek peak heights related to the free interstitial concentrations in bcc ferrite. Microstructural changes after tensile deformation were assessed …
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Deformation Mechanisms in Pd Nanowhiskers
… response. In addition, structures with small volumes can possess much lower defect densities, which could potentially be driven out of the volume instead of interacting and promoting traditional deformation behavior. Systematic experimental investigations will be crucial to developing the …
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High-pressure viscosity and density of polymer solutions at the critical polymer concentration in near-critical and supercritical fluids
… by Arrhenius type relationships in terms of flow activation energy (E#) and flow activation volume (V#) parameters. The flow activation energies in PDMS + CO₂ system were about 7 kJ/mol compared to about 18 kJ/mol for the PE + n-pentane system. The activation volumes were in the range 40-64 …
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Strain rate and temperature dependent mechanical behavior of nanocrystalline gold
… stress-strain curves were used to calculate activation volumes for two film thicknesses (0.85 μm, and 1.75 μm), which were 4.5b3 and 8.1b3, at strain rates smaller than 10-4 s-1 and 12.5b3 and 14.6b3 at strain rates higher than 10-4 s-1. The reduced activation volume and increased strain rate …
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Stability of microbial transglutaminase and its reactions with individual caseins under atmospheric and high pressure
Kinetic inactivation of factor XIIIa and MTG were performed in a pressure range from 0.1 to 400 MPa at 40°C within a time from 0 to 60 min in a TRIS-acetate buffer at pH 6.0. The inactivation of both enzymes at these conditions followed a first order reaction model. The high inactivation rate …