Efficiency factor greater than

Accuracy The accuracy of a controlled-current coulometric method of analysis is determined by the current efficiency, the accuracy with which current and time can be measured, and the accuracy of the end point. With modern instrumentation the maximum measurement error for current is about +0.01%, and that for time is approximately +0.1%. The maximum end point error for a coulometric titration is at least as good as that for conventional titrations and is often better when using small quantities of reagents. Taken together, these measurement errors suggest that accuracies of 0.1-0.3% are feasible. The limiting factor in many analyses, therefore, is current efficiency. Fortunately current efficiencies of greater than 99.5% are obtained routinely and often exceed 99.9%. 

The fluorescent decay data of europium tris-thenoyltrifluoroacetonate (EuTTA)3 as given in Table XI suggests that both mechanisms are operative. This may be inferred from the fact that not only is the lifetime longest in tri-iV-butyl phosphate (TBP), but the quantum efficiency of energy transfer to the emitting level is also greater. The quantum efficiency is found to increase by a factor greater than the lifetime. 

The examples shown in Table 8.2 do not show a particularly high enantioselec-tivity. However, with an enantiomeric excess of 50 % (75/25), material of acceptable optically purity can be obtained in five cycles, and for chromatographic resolutions, separation factors greater than one are sufficient for efficient resolution processes [222,223l Nickel(II) complexes of the type shown in Table 8.2 have been used to modify ion-exchange resins that were used for racemate separations[222], and derivatives of (S),(with functional groups that may be fixed to supports are readily available12 5]. 

Detection efficiency (counts per reactor fission) determines the measurement time required to attain the desired statistical precision and therefore limits the distances between detectors. Thus, detection efficiency determines the lengths of fission chains that provide correlatable events for calculation of cross power spectral densities. Measurements have been satisfactorily performed by this method, with detection efficiencies as low as 10 count per reactor fission. For this larg BWR, Ae ralculated detection efficiency is greater than 10 for a 5-g U fission detector within 70 cm of the c6re center. More efficient detectors such as Li glass sc tillators (factor of —100 larger) could be us d for unirradiated fuel, and measurements could be made with these detectors more than 100 cm from the core center. 

Calix[4]-W5-crowns 1-7 are used as selective cesium-carriers in supported liquid membranes (SLMs). Application of the D esi diffusional model allows the transport isotherms of trace level Cs through SLMs (containing calix[4]-6/5-crowns) to be determined as a function of the ionic concentration of the aqueous feed solutions. Compound 5 appears to be much more efficient than mixtures of crown ethers and acidic exchangers, especially in very acidic media. Decontamination factors greater than 20 are obtained in the treatment of synthetic acidic radioactive wastes. Permeability coefficient measurements are conducted for repetitive transport experiments in order to determine the SMLs stability with time. Very good results (over 50 days of stability) and high decontamination yields are observed with l,3-calfac[4]-Aw-crowns 5 and 6. 

Equation 4.64 shows that for a fuel stoichiometric factor greater than one, the current efficiency of the fuel cell is less than 100%. 

Magnetic pulleys. These vary in size from 0.203 to 1.219 m in diameter and from 2.03 to 1.526 m in width. The acceptable depth of the material on the conveyor belt depends on the diameter of the pulley and the linear velocity of the belt (see Table 19-18). Table 19-19 indicates the maximum capacity for such units. Depending on the apphcation, the correction factors given in Table 19-20 should be apphed. For sizing and maximum efficiency, multiply the actual volume of material to be handled by the correction factor shown and select the magnetic pulley having a capacity equal to or greater than the resultant volume. 

The total releases to air from the facility must be entered m Part III, Section 5 of Form R in pounds per year. The stack test results provide the concentration of metallic lead in each exhaust stream in grains per cubic toot and the exhaust rate in cubic feet per minute. Using the appropriate conversion factors, knowing the scrubber efficiency (from the manufacturer s data), and assuming yourfacility operates 24 hours per day, 300 days per year, you can calculate the total lead releases from the stack test data. Because point (stack) releases of lead are 2,400 pounds per year,-which is greater than the 999 pounds per year ranges in column A. 1, you must enter the actual calculated amount in column A.2 of Section 5.2. 

The work done in a reversible compression will be considered first because this refers to the ideal condition for which the work of compression is a minimum a reversible compression would have to be carried out at an infinitesimal rate and therefore is not relevant in practice. The actual work done will be greater than that calculated, not only because of irreversibility, but also because of frictional loss and leakage in the compressor. These two factors are difficult to separate and will therefore be allowed for in the overall efficiency of the machine. 

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