Self Diffusion Coefficient
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. Self-diffusion coefficients of na+ in water-methanol mixtures
Uma versão modificada do método do capilar aberto de Anderson e Saddington foi empregada na determinação do coeficiente de autodifusão do íon de Na+ em solvente misto p-metanol. O 22~af+oi utilizado como radiotrapador e a técnica foi testada com uma solução aquosa de NaC1. Foram determinados coeficientes de autodifusão do Na+ para diversas proporç
Publicado em: 2011
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2. Electrochemical study and dependence of 'transition state' in Co(II) and Ni(II) complexes with some antibiotics and cephalothin
Electrode kinetics and study of 'transition state' with applied potential in case of [M - antibiotics - cephalothin] system were reported at pH = 7.30 ± 0.01 at suitable supporting electrolyte at 25.0ºC. The M = Co or Ni and antibiotics were doxycycline, chlortetracycline, oxytetracycline, tetracycline, minocycline, amoxicillin and chloramphenicol used as
Eclética Química. Publicado em: 2007
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3. Atomistic simulation for difusion mechanisms investigation : self diffusion coeficient of simples gases in polymeric matrix / Simulação atomistica como ferramenta para investigação dos mecanismos de difusão : coeficientes de autodifusão de gases simples em matriz polimerica
In this thesis a study of the predictive potential of the molecular dynamic simulation was performed for transport properties of light gases in polyimide matrix. From de practical point of view permeability is the property of most interest, and involves kinetics as well as thermodynamics properties, diffusion coefficient and solubility of the penetrants mole
Publicado em: 2006
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4. Dinâmica molecular aplicada ao estudo de polímeros lineares fundidos: cálculo do coeficiente de auto-difusão
In this work linear polymeric melts had been studied using Molecular Dynamics technique. Computational simulations of polymeric chains of several sizes were performed. The self-diffusion coefficients were calculated varying the size of the chains as well the free volume. In addition was studied the quality of the solvent related to the self-diffusion coeffic
Publicado em: 2006
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5. Diffusion of the 65Zn radiotracer in ZnO polycrystalline ceramics
Zinc self-diffusion coefficients were measured in polycrystalline ZnO of high density (>99% of the theoretical density) and of high purity (> 99.999%). The diffusion experiments were performed from 1006 to 1377 °C, in oxygen atmosphere, for times between 16 and 574 h. The diffusion profiles were established by means of Residual Activity Method using the 65Z
Materials Research. Publicado em: 2003-06
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6. Diffusional Properties of Methanogenic Granular Sludge: 1H NMR Characterization
The diffusive properties of anaerobic methanogenic and sulfidogenic aggregates present in wastewater treatment bioreactors were studied using diffusion analysis by relaxation time-separated pulsed-field gradient nuclear magnetic resonance (NMR) spectroscopy and NMR imaging. NMR spectroscopy measurements were performed at 22°C with 10 ml of granular sludge a
American Society for Microbiology.
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7. Interactions of spermidine and methylspermidine with DNA studied by nuclear magnetic resonance self-diffusion measurements.
The NMR pulsed field gradient self-diffusion method has been used to study the self-diffusion of the polyamine spermidine and the polyamine analog methylspermidine (completely N-methylated spermidine). The self-diffusion coefficient, D, was measured in solutions of calf thymus DNA prepared from nucleosome core particles (with an average length of 120 base pa
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8. Averaging and renormalization for the Korteveg–deVries–Burgers equation
We consider traveling wave solutions of the Korteveg–deVries–Burgers equation and set up an analogy between the spatial averaging of these traveling waves and real-space renormalization for Hamiltonian systems. The result is an effective equation that reproduces means of the unaveraged, highly oscillatory, solution. The averaging enhances the appare
National Academy of Sciences.
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9. Properties of Molten Magnesium Oxide
The Significant Structure Theory of Liquids has been used to calculate the thermodynamic properties, viscosity, self-diffusion coefficient, and specific conductance of molten magnesium oxide, taking account of the decomposition of MgO to Mg and O2 species in the gas-like part of the partition function.
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10. Lateral diffusion in model membranes is independent of the size of the hydrophobic region of molecules.
We have systematically investigated the probe size and shape dependence of lateral diffusion in model dimyristoyl phosphatidylcholine membranes. Linear hydrophobic polymers, which differ in length by an order of magnitude, were used to explore the effect on the lateral diffusion coefficient of hydrodynamic restrictions in the bilayer interior. The polymers e
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11. Macromolecular diffusion in crowded solutions.
The effects of crowding on the self or tracer diffusion of macromolecules in concentrated solutions is an important but difficult problem, for which, so far, there has been no rigorous treatment. Muramatsu and Minton suggested a simple model to calculate the diffusion coefficient of a hard sphere among other hard spheres. In this treatment, scaled particle t
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12. F-actin, a model polymer for semiflexible chains in dilute, semidilute, and liquid crystalline solutions.
Single actin filaments were analyzed in solutions ranging from dilute (0.2 microgram/ml), where filaments interact only with solvent, to concentrations (4.0 mg/ml) at which F-actin forms a nematic phase. A persistence length of approximately 1.8 microns and an average length of approximately 22 microns (Kaufmann et al., 1992) identify actin as a model for st