Mixtures space, weighting

Catalyst Catalys t weight (mg) Gas flow rate (cm /min) Inlet gas mixture Space velocity, X, (cm /g catmin) Ref. 

ESI mass spectra of mixtures are difficult to interpret, because each component produces ions with many different charge states. The most direct and reliable method to solve this problem is to use high-resolution MS and calculate the charge states by measuring the spacing of the isotope peaks. ESI mass spectrometry of (polymeric) mixtures with broad molecular weight distribution benefits from a prior separation that reduces the polydispersity of the analyte. 

The propellant mixture in each solid rocket booster of the Space Shuttle contains ammonium perchlorate ( the oxidizer, 69.6% by weight), aluminum ( the fuel, 16% by weight), an iron oxide catalyst (0.4% by weight), a polymeric binder that... 

Equation (15) has been successfully used to determine the relative amounts of anhydrous carbamazepine (C15H12N20) and carbamazepine dihydrate (C15H12N20 2H20) when they occur as a mixture [47]. The powder x-ray patterns of anhydrous carbamazepine and carbamazepine dihydrate revealed that the lines with d-spacings of 6.78 A (peak at 13.05° 26) and 9.93 A (peak at 8.90° 20) were unique to anhydrous carbamazepine and carbamazepine dihydrate, respectively (Fig. 5). In mixtures containing these two phases, anhydrous carbamazepine was first considered the unknown component while carbamazepine dihydrate was designated the matrix. The intensity ratios, Ai/(/ii)o were calculated (Table 4) for different values of xx (different weight fractions of... 

Following the example of (5.307), the model equations are written in terms of the mixture-fraction-PDF-weighted conditional means. The integral of (5.399) over mixture-fraction space will eliminate the first two terms on the right-hand side, leaving only the mean chemical source term as required. 

Taylor LA, Pieters CM, Keller LP, Morris RV, McKay DS (2001) Lunar Mare Soils Space weathering and the major effect of surface-correlated nanophase Fe. J Geophys Res 106 27985-27999 Taylor PDP, Maeck R, De Bievre P (1992) Determination of the absolute isotopic composition and Atomic Weight of a reference sample of natural iron. Int J Mass Spectrom Ion Proc 121 111-125 Taylor PDP, Maeck R, Hendricks F, De Bievre P (1993) The gravimetric preparation of synthetic mixtures of iron isotopes. Int J Mass Spectrom Ion Proc 128 91-97... 

A variation of the lamellar model was recently proposed by Haubold et al., in which synchrotron SAXS studies were performed on acid form Nafion 117 samples. The molecular weight of these samples was reported to be 250 000 g mol and the experiments were conducted on dry samples in air and samples equilibrated with water, methanol, and a range of water/methanol mixtures using an in situ flow cell. The most fundamental result of this study is that the data show the usual ionomer peak at = 1.4 nm which gives a Bragg spacing of d= Zjtlq ... 

The value of reaction rate Eq. (43) can be negative when N02 present in the mixture is transformed to NO via backward reaction, typically at higher temperatures. A comparison of measured and simulated outlet N02 concentrations in dependence on temperature can be seen for two different space velocities in Fig. 13. The pre-exponential factor k j and activation energy Ej of the kinetic constant no/no2 in the global rate law were evaluated by the weighted least squares method, Eq. (35). 

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