Relative gain yield

Gaines has prepared l,l-dimethyldiborane(6) in relatively high yield by means of a novel "insertion reaction which appears to be of general utility. 

The relative-gain array method, which determines how the controlled and manipulated variables should be coupled to yield control loops with minimal interaction... 

A thorough study of the production of Sn in the hydraulic tube (HT) of the HFIR has been reported (Mirzadeh et al. 1997), and it was shown that the yield from the (n,n ) reaction was higher than that obtained from the (n,y) reaction and the relative gain in the specific activity was 3.3. The cross section for the inelastic neutron scattering reaction for the production of Sn was 222 16 mb. A value of 176 14 mb for the cross section of the Sn(n,n ) Sn reaction obtained at HFBR was reported earlier (Mausner et al. 1985). 

Based on these results, it appears that the reactor may operate better if the ratio of combined B (feed plus recycle) to the A feed were controlled instead of just the feed stream ratio. To analyze this case, we let R be the ratio of combined B-stream flow rate (w2 + wg) to the A-stream flow rate (w ). Recalculating the relative gain array yields a surprising result two of the recommended control loops now become highly interacting ( values of —3.6) as given in Eq. H-3. This undesired result can be confirmed by simulation. 

As a material for fuel-gas and water distribution pipe systems, polyethylene (PE) has so many advantages that it has gained widespread use despite its relatively low yield stress. This low strength necessitates a thicker pipe wall which, in turn, favours plane strain fracture. Unfortunately PE — like many thermoplastics — has relatively little resistance to plane strain fracture at high crack speeds. As a result, pipe grade PEs for large-diameter pressure pipe need careful development if they are to demonstrate sufficient resistance to Rapid Crack Propagation (RCP). 

Figure 10 0 yield functions for electron impact on (a) gaseous O2, (b) 4 ML of O2, and (c-g) 0.15 ML of O2 condensed on 4 ML of the indicated substrate. The dashed lines and bars indicate the known positions of the Oj resonances. The gain factor over each curve is relative to curve (c), and the shifted baselines correspond to the zero anion intensity levels. Figure based on the data of Ref. 41. 

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