Computer error logs

All quality systems need to demonstrate that the equipment used is properly maintained and in some instanees ealibrated. Computers are no exception to this. Therefore, records of the maintenance of the CDS need to be set up and updated in line with the work carried out on it. The main emphasis of the maintenance records is toward the physical components of a system hardware, networking, and peripherals. The software maintenance is covered imder the error logging system described above. 

The computed eigenenergies are compared with reference values". In Fig. 2 and 3 we present the maximum absolute error log Q Err) where... 

COMPUTES THE LOG-ERRORS IN CURRENT FOR THE COTTRELL EQUATION, SOLVED BY THE CRANK-NICOLSON TECHNIQUE, WITH VARIABLE T, USING THE TRANSFORMATION FUNCTION (WITH P < 1)... 

The experimental error was estimated as 1-4% in k (208). In Figure 11, the more skeptical value of 5% is shown in Figure 12, the corresponding errors in E and log A are pictured at the point 29. In the coordinates logkj versus log ki, the correlation coefficient can be computed as r =. 9919 or. 9991, with or without the point 4, respectively. The corresponding standard deviations from the regression lines are. 068 and. 022 log unit, respectively. Their difference justifies the exclusion of point 4 the latter value compares favorably with the estimated error of 5% in k =. 021 log unit. 

Beck, B., Breindl, A., Qark, T. QM/NN QSPR models with error estimation vapor pressure and log P. J. Chem. Inf. Comput. Sci. 2000, 40,1046-1051. 

The exact amount of error introduced cannot immediately be inferred from the strength of the amplitudes of the neglected Fourier coefficients, because errors will pile up in different points in the crystal depending on the structure factors phases as well to investigate the errors, a direct comparison can be made in real space between the MaxEnt map, and a map computed from exponentiation of a resolution-truncated perfect m -map, whose Fourier coefficients are known up to any order by analysing log(<7 (x) tm (x)). 

Using modern computer curve-fitting techniques,102 equations (17) and (27) can be fitted simultaneously with variables X, log CH+ and D, obtaining pATBH+. m, DB and DA as coefficients, which is a more precise technique than calculating log/ values first and using equation (17) and the error function61 discussed above. 

Uncertainty in the calculation, however, affects the reliability of values reported for saturation indices. Reaction log Ks for many minerals are determined by extrapolating the results of experiments conducted at high temperature to the conditions of interest. The error in this type of extrapolation shows up directly in the denominator of log Q/K. Error in calculating activity coefficients (see Chapter 8), on the other hand, directly affects the computed activity product Q. The effect is pronounced for reactions with large coefficients, such as those for clay minerals. 

Potentiometric measurements give log(3/ values which are correct to within 10% but the relative accuracy is difficult to assess due to the successive, repetitive nature of the experiments. Probably the most significant source of error, as we have stated, is the variation of pH with time. At tracer concentrations the enthalpy AH0 can be determined only by the temperature differential method. However, the temperature differential method is not as precise as the calorimetric one. The enthalpy of formation for each complex is computed with the assumption that ACp is constant over the temperature range and that the range of error corresponds to 10%. 

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