Nitrogen partial pressures

To further test the model, calculations were performed to simulate the isotopic tracer experiments presented in Figs. 9 and 10. It should be noted that while the tracer experiments were performed at 438K, the rate coefficients used in the model were chosen to fit the experiments in which chemisorbed NO was reduced at 423 K. Figures 21 and 22 illustrate the nitrogen partial pressure and surface coverage responses predicted for an experiment in which 5 0 is substituted for l NO at the same time that H2 is added to the NO flow. Similar plots are shown in Figs. 23 and 24 for an experiment in which NO is substituted for during steady-state reduction. 

Figure 8. Nitrogen + water—mole fraction solubility at 1 atm nitrogen partial pressure vj. temperature ( ) (10, 15, 16) (0) (12, 13, 14, 171 (values used in the...

The nitrogen partial pressure of the transition metal nitrides is a function of temperature and increases substantially with... 

A high inert gas level has various drawbacks. It decreases the specific converter performance by reducing the hydrogen and nitrogen partial pressures. The gas recycle... 

Carignan, R. (1998). Automated determination of carbon dioxide, oxygen, and nitrogen partial pressures in surface waters. Limnol. Oceanogr 969—975. 

The onset of carbothermal reaction of Si-N units and decomposition of Si3N4 into the elements depends on the nitrogen partial pressure. Increasing N2 pressure results in increased reaction temperatures, and vice versa. The quantitative context is given in the partial pressure diagrams shown in Figure 18.3. °... 

Figure 12 indicates that at any fixed temperature the three condensed phases, Si, SiC, and Si3N4, can coexist at equilibrium only at a fixed carbon activity and nitrogen partial pressure, i.e., at the triple point for that temperature. For example, at 1600°C this point occurs when log ac... 

Figure 6. Generalized hamster dose-response curves If the nitrogen partial pressure is high enough, the mortality will eventually go to 100%. However, with lower partial pressures the mortality rises to some asymptotic value after a constant time period. In this domain one can study the time effects independent of the nitrogen partial pressure.

Figure 8. Hamster mortality as a function of maximum value of slow tissue nitrogen partial pressure (8)...

Corrosion by Metals Reactions of Si3N4 with metals and alloys are a complex issue, because the atmosphere both for oxygen and nitrogen partial pressures plays a role and silicides, nitrides, or ternary compounds can form. A good compilation of the partly conflicting observations has been provided [116], For the interaction of the related SiAlONs and Fe-based alloys see published work [124]. 

Several of the transition metal-nitrogen systems were established only recently and there is still some lack of knowledge for systems for the investigation of which a high nitrogen partial pressure is necessary. As for the carbides systems only recent results will be presented here (see also [10]). 

A space abo e the coolant le el inside the RPV is as a self - pressurized space ( inside the RPV is depends on initial partial pressure of nitrogen and saturate apoiir pressure corresponds to the core outlet temperature in the pressunzed water operation mode Due to the nitrogen partial pressure existing the coolant can be kept subcooling in the core outlet This is calledpressunzed water operation mode... 

Control of the sintering atmosphere is also important, and precise control of the oxygen or nitrogen partial pressure as a function of temperature may in some cases be beneficial or essential. Ferrites, for example, form an important class of ceramics where atmosphere control is essential for developing optimum... 

The carbon dioxide permeability for both mixtures was depressed below the pure carbon dioxide values, but the carbon dioxide permeability for the 50/50 mixture did not display a decreasing tendency with pressure as was observed for the 10/90 CO2/N2 mixture. Therefore, at the lower nitrogen partial pressures observed in the 50/50 mixture, the impact of the hydrostatic pressure effect is reduced by the swelling effect of CO2. Although the swelling effect of CO2 cannot completely overcome the hydrostatic pressure effect of CO2 nitrogen, it greatly offsets its influence. 

With pn2 Nitrogen partial pressure over melt in bar, k Material constant (temperature and alloy dependent)... 

Nitrogen partial pressure high enough to allow a dissociation at 40 bar... 

The oxidation of silicon nitride typically occurs with parabolic kinetics (Choi et al. (1989), Du etal., 1989a Schiroky etal. (1986) Ogbuji and Opila, 1995), is dependent on oxygen partial pressure, and is independent of nitrogen partial pressure (Du et al., 1989a). These three observations show that the oxidation kinetics are controlled by oxygen transport across a grow-... 

The response to hydrogen and nitrogen partial pressure of nickel and cobalt differs from that of iron. Both catalysts exhibit marked increases in synthesis rate with nitrogen partial pressure, although the effect is more marked for cobalt. Nickel also shows a significant increase in rate with hydrogen partial pressure at constant nitrogen pressure. These results can be fitted to the Temkin equation with values for a of 0.22 and 0.32 for cobalt and nickel, respectively, compared to 0.5 or more for iron. 

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