Missing values zero results

The results of the adsorption Ar on Teflon shown in Fig. 78 are in the untransformed form to illustrate the shape of the isotherm. The data for this figure are given in Table 24 to show the precision and accuracy that is obtainable with the instrumentation described. In this form, even with a high threshold pressure, the presence of a threshold pressure for most experiments, especially the volumetric type, would be missed. The zero pressure recording, however, is very obvious with the instruments described. This value is well within any conceivable error by a factor of 10 The flat portion of the pressure curve is more evident in the x plot. This plot is shown... 

It is emphasized that the final result is the structure map of the examined crystal rather than a pseudo structure map. This is because the difftaction intensities have been pushed towards the corresponding kinematical values during the calculation of partial structure factor in each cycle of the correction. In addition, in the final step, structure refinement by Fourier synthesis modifies the peak heights towards the true values to some extent. It is obvious that all the missing structure information due to the CTF zero transfer is mended after phase extension. The amplitudes are provided by the electron diffraction data, and the phases are derived from the phase extension. As a result, the resolution of the structure analysis by this method is determined by the electron diffraction resolution limit. 

Incompletely documented compounds are dealt with in the following way when data for the unknown compound are missing, the respective priorities are set to zero and no comparison is made. As the similarity measure S is printed out relative to what would be the value at identity, there are no problems in comparing S values. If some data concerning a reference compound are missing, instead of performing a comparison the computer scores it at a certain percentage (e. g. 85%) of the value for complete correspondence to ensure that premature breakoff does not occur as a result of comparisons not actually performed. 

When the effective Hamiltonian is constructed from ab initio wave functions the resulting matrix is numerical in nature. This matrix can be used to determine the values of the parameters of a phenomenological model Hamiltonian, but also to check the validity of the model. In most cases the structure of the effective Hamiltonian matrix coincides with the structure of the model Hamiltonian, but when significant deviations are observed, it should not be discarded that important interactions are missing in the model. For instance, when non-zero matrix elements appear in the... 

Equation 14 consists of an unmodulated part with amplitude 1 - U2, the basic frequencies and cop with amplitudes kJl, and the combination frequencies < and w+ with amplitudes k 4, and inverted phase. To compute the frequency-domain spectram, first the unmodulated part is subtracted, as it gives a dominant peak at zero frequency for the usual case of small k values. A cosine Fourier transform (FT) of the time trace results in a spectrum that contains the two nuclear frequencies, w and cop, with positive intensity, and their sum and difference frequencies, a>+ and m, with negative intensity. If the initial part of the time-domain trace is missing, then the spectrum can be severely distorted by frequency-dependent phase shifts and it may be best to FT the time-domain trace and compute the magnitude spectrum. 

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