Vincent model

Robert J. Kee, Huayang Zhu, Robert J. Braun, and Tyrone L. Vincent, Modeling the Steady-State and Dynamic Characteristics of Solid-Oxide Fuel Cells... 

From a knowledge of the adsorption, immersion, and wetting properties of solid particles, we have examined the influence of particle-particle and particle-liquid interactions on the stability and structure formation of suspensions of hydrophobic and hydrophilic Aerosil particles in benzene-n-heptane and methanol-benzene mixtures. For the binary mixtures, the Hamaker constants have been determined by optical dispersion measurements over the entire composition range by calculation of the characteristic frequency (Vk) from refractive index measurements [7,29,36,64], The Hamaker constant of an adsorption layer whose composition is different from that of the bulk has been calculated for several mixture compositions on the basis of the above results. Having the excess isotherms available enabled us to determine the adsorption layer thickness as a function of the mixture composition. For interparticle attractive potentials, calculations were done on the basis of the Vincent model [3-5,39]. In the case of hydrophobic particles dispersed in benzene- -heptane and methanol-benzene mixtures, it was established that the change in the attractive potential was in accordance with the interactions obtained from rheological measurements. 

Saunders B R and Vincent B 1999 Microgel particles as model colloids theory, properties and applications Adv. Colloid Interface Sol. 80 1 -25... 

Glicksman, L. R., Yule, T., Carson, R., and Vincent, R, Comparison of Results from TVA 20 MW Fluidized Bed Combustor with MIT Cold Scale Model, ... 

Several theoretical models have been proposed to explain these phenomena. The first crude model is due to Vincent et al. 

Manganese Redox Enzymes and Model Systems Properties, Structures, and Reactivity Neil A. Law, M. Tyler Caudle, and Vincent L. Pecoraro... 

A probable role of an excited metastable state for the oxygen center of GaAs has already been mentioned in connection with our discussion of the configuration coordinate model (Section 10b). This was suggested by Vincent and Bois (1978) to explain a slow decrease of photocapacitance observed after... 

Li de La Sierra, I.M. Gallay, J. Vincent, M. Bertrand, T. Briozzo, P. Barzu, O. Gilles, A.M. Substrate-induced fit of the ATP binding site of cytidine monophosphate kinase from Escherichia coli time-resolved fluorescence of 3 -anthraniloyl-2 -deoxy-ADP and molecular modeling. Biochemistry, 39, 15870-15878 (2000)... 

Figure 14-10 Models of catalytic intermediates for aspartate aminotransferase in a half-transamination reaction from aspartate to oxalocetate. For clarity, only a selection of the active site groups are shown. (A) Michaelis complex of PLP enzyme with aspartate. (B) Geminal diamine. (C) Ketimine intermediate. The circle indicates a bound water molecule. See Jansonius and Vincent in Jurnak and McPherson.163 Courtesy of J.N. Jansonius.

Clodfelder, B.J., R.G. Upchurch, and J.B. Vincent. 2004. A comparison of the insulin-sensitive transport of chromium in healthy and model diabetic rats. J. Inorg. Biochem. 98 522-33. 

Vincent, K. A., Shyu, K. G., Luo, Y., Magner, M., Tio, R. A., et al. 2000. Angiogenesis is induced in a rabbit model of hindlimb ischemia by naked DNA encoding an HIF-lalpha/VP16 hybrid transcription factor. Circulation 102 2255-2261. 

Fig. 5-21. Proposed model for oxyanion binding. A=non-competitive site, B=competitive site. Reproduced from Vincent et al. (1991).

In order to test the model used here, calculated values of the limiting free polymer concentration 0 at which phase separation occurs are compared with the experimental data [6] on the aqueous dispersions of polystyrene latex particles with adsorbed polyethylene oxide and with polyethylene oxide as the free polymer. Since no information is available regarding the thickness of the adsorbed layer, the values used by Vincent et al. [6] in their theoretical calculations are adopted. Table 1 compares the experimental values of the limiting volume fraction of the free polymer with our calculated values for two different molecular weights of the free polymer. The simple model used here gives reasonably good agreement with the experimental values. 

The simple model (Fig. 20) can be criticized because it cannot readily be quantified. However, it does account for a wide range of properties, such as the tendency for the partial molar heat capacity and the viscosity -coefficient to become more negative with increase in ion size (Fortier et al., 1974a McDowell and Vincent, 1974 Kay, 1968 1973). Kay has collated conductance and viscosity data and shown how these lead to a classification of ionic properties (Fig. 21). The effects of added salts on the self-diffusion of ions is consistent with the Frank-Wen structural model (Hertz et al., 1974). It is noteworthy that in D20, which is argued to be more... 

Almost simultaneously, a collaborative effort modeling the reactivity of dinuclear sites of iron oxidative enzymes was reported by Vincent et al. (27). Their dinuclear model, Fe20(0Ac)2Cl2(bipy)2, 5 (bipy 2,2 -bipyridine), synthesized by cleavage of tetrameric [Fe402(0Ac)7(bipy)2]+, 6, (equation 1), was especially designed to have open or exchangeable coordination sites. 

Vandenbussche S, Diaz D, Femandez-Alonso MC, Pan WD, Vincent SP, Cuevas G, Canada FJ, Jimenez-Barbero J, Bartik K (2008) Aromatic-carbohydrate interactions an NMR and computational study of model systems. Chem Eur J 14 7570-7578... 

S. Woodcock, D. V. S. Green, M. A. Vincent, 1. H. Hillier, M. F. Guest, and P. Sherwood, ]. Chem. Soc., Perkin Trans. 2, 2151 (1992). Tautomeric Equilibria in 3- and 5-Hydroxy-isoxazole in the Gas Phase and in Aqueous Solution A Test of Molecular Dynamics and Continuum Models of Solvation. 

Fackrell, 1984 [174]). Hunt and Castro, 1981 [282] extended the work of Vincent, 1977 [636] to dispersion of clouds in building wakes. The basic concepts for plumes were developed by Hunt and Mulhearn, 1973 [280], Puttock and Hunt, 1979 [513], Hunt et al., 1979 [281] and Davidson et al., 1995 [143], Robins and Apsley, 2000 [539] brought many of the results together for dispersion from local sources near cuboid obstacles in the Buildings Module of the ADMS model. Hall et al., [243, 247] extended the results to cover dispersion around many obstacles in their code UDM. We describe the characteristic processes below and outline the simple models that have been developed. 

Vincent, J.H. (1977) Model experiments on the nature of air pollution transport near buildings, Atmospheric Environment 11, 765-774. 

Black, K. R,. Vincent, C. E., 2001. High-resolution field measurements and numerical modelling of intra-... 

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