Anderson phase

The adsorption isotherms for the RhMoe Anderson phase were measured at room temperature using the C, Cf and Ca values determined for M=Mo. When the concentration of Mo adsorbed (Ca) expressed as monolayer (%) was plotted against the Mo concentration in solution at equilibrium (Cf), the shape of the resulting curve was found to follow the Langmuir model [13]. Hence, by plotting the linearised form of the Langmuir equation, i. e. 

In some previous vibrational studies for Anderson phases, the observed bands seem to be independent from the heteroatom types [12], However, by careful measurements between 950-200 cm of the Raman spectra for all members of this series, it is possible to notice that the bands associated to the Mo-Ot bonds are the most affected by the X change. The vibrational modes associated to the Mo-Ob and Mo-Oc bonds are less affected by the change of heteroatom, undoubtedly because they cannot be considered as pure stretchings and show some bend- character [15],... 

The Raman spectra, showing very sharp bands, make the shift clearer. Generally, Raman spectra of compounds with an octahedral coordination exhibit main lines in the high frequency range (800-1000 cm ) [19]. Table 1 shows Raman frequencies for the RhMoe and some other Anderson phases for comparative purposes. 

Fig. 3 shows the adsorption isotherm in 7-AI2O3 of RhMoe obtained at room temperature and using Ca (gMo/100g7-Al203) values but expressed as (%) of monolayer in function of Cf (pmol Mo/ml). Similarly to other Anderson phases recently studied, the bend shape corresponds to a Langmuir model and, by using its linearized equation (1), it was possible to obtain adsorption parameters such as number of S active sites and adsorption constant Kad [7]. 

The comparison between the catalytic behaviour of Co and Rh Anderson phases reveals that, although the Mo content is lower for the latter, the HDS activities are similar. Hence, the synergic effect of Rh on the Mo is higher than that observed for the Co system. This is in agreement with literature for pure sulfides. This behaviour is more clearly observed from the comparison among the specific activities (Shydand S hds)-... 

Pollack A, Zagars GK, Starkschall G et al (2002) Prostate cancer radiation dose response results of the M. D. Anderson phase III randomized trial. Int J Radiat Oncol Biol Phys 53 1097-1105... 

Figure 19.8. SAXSAVAXS patterns recorded every two minutes during synthesis steps 1-3 (left) and selected WAXS patterns, in which the reflections of the stable Anderson phase are marked (right).

VLE data are correlated by any one of thirteen equations representing the excess Gibbs energy in the liquid phase. These equations contain from two to five adjustable binary parameters these are estimated by a nonlinear regression method based on the maximum-likelihood principle (Anderson et al., 1978). 

Anderson FI, Kodas T T and Smith D M 1989 Vapor phase prooessing of powders plasma synthesis and aerosol deoomposition Am. Ceram. See. Bull. 68 996-1000... 

Ahrens, T.J., Anderson, D.L., and Ringwood, A.E. (1969), Equation of State and Crystal Structures of High-Pressure Phases of Shocked Silicates and Oxides, Rev. Geophys. 7, 667-707. 

To describe hypergolic heating, Anderson and Brown (A10) proposed a theoretical model based upon spontaneous exothermic heterogeneous reactions between the reactive oxidizer and a condensed phase at the gas-solid interface. In these studies, the least complex case was considered, i.e., the one in which the solid phase is instantaneously exposed to a stagnant (nonflowing) gaseous oxidizer environment. This situation can be achieved experimentally provided the sample to be tested is suddenly injected into the desired environment in a manner designed to minimize gas flow. 

A third alternative has been proposed by Anderson and Brown (A6, A9) as an outgrowth of their research on the ignition of composite propellants. Their ignition studies suggest significant contributions to the overall combustion process from the solid phase. Two exothermic reaction zones contributing to combustion are considered, as shown schematically in Fig. 19. 

In order to overcome these problems, one approach, originally developed by Whitaker [420], Slattery [359], and Anderson and Jackson [17], involves the method of volume averaging. Using volume averaging theory, Whitaker and coworkers [193,264,268,337,436] found the effective diffusion tensor for a two-phase system to be given by... 

For polychlorinated biphenyls (PCBs), rate constants were highly dependent on the number of chlorine atoms, and calculated atmospheric lifetimes varied from 2 d for 3-chlorobiphenyl to 34 d for 236-25 pentachlorobiphenyl (Anderson and Hites 1996). It was estimated that loss by hydroxy-lation in the atmosphere was a primary process for the removal of PCBs from the environment. It was later shown that the products were chlorinated benzoic acids produced by initial reaction with a hydroxyl radical at the 1-position followed by transannular dioxygenation at the 2- and 5-positions followed by ring fission (Brubaker and Hites 1998). Reactions of hydroxyl radicals with polychlorinated dibenzo[l,4]dioxins and dibenzofurans also play an important role for their removal from the atmosphere (Brubaker and Hites 1997). The gas phase and the particulate phase are in equilibrium, and the results show that gas-phase reactions with hydroxyl radicals are important for the... 

Ortiz-Bernad I, RT Anderson, HA Vrionis, DR Lovley (2004a) Resistance of solid-phase U(VI) to microbial reduction during in situ bioremediation of uranium-contaminated groundwater. Appl Environ Microbiol 70 7558-7560. 

Fenoprofen, Mg is used as a sacrificial electrode and additionally a phase transfer catalyst is used (Anderson, 2000)... 

Olafsson M, Eggler DH (1983) Phase relations of amphibole, amphibole-carbonate, and phlogopite-carbonate peridohte petrologic constraints on the asthenosphere. Earth Planet Sci Lett 64 305-315 Olson P, Schubert G, Anderson C, Goldman P (1988) Plume formahon and lithosphere erosion a comparison of laboratory and numerical experiments. J Geophys Res 93 15065-15084 Pearson DG, Shirey SB, Carlson RW, Boyd FR, Nixon PH (1995) Stabilisahon of Archean lithospheric manhe A Re-Os isotope isotope study of peridohte xenoliths. Earth Planet Sci Lett 134 341-357... 

Saari-Nordhaus, R. and Anderson, Jr., J. M., Ion chromatographic analysis of anions using a solid-phase chemical suppressor, Am. Lab., 26 (January), 28C, 1994. 

This work and any practicable results derived therefrom have been encouraged and expedited throughout by the American Cyanamid Company. Additionally, the authors wish to express appreciation for aid in various phases of the work to Mrs. M. Elliot Miller, Charlotte McHale, Jacquelyn Sellers, L. D. Anderson, M. M. Barnes, G. E. Carman, J. H. Barkley, J. C. Ortega, C. R. Shafer, and H. U. Meyer of these laboratories, and to W. E. Baier and C. W. Wilson of the California Fruit Growers Exchange, Ontario. 

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