Scaling external correlation

There are a few other correction procedures that may be considered as extrapolation schemes. The Scaled External Correlation (SEC) and Scaled All Correlation (SAC) metiiods scale tire correlation energy by a factor such that calculated dissociation energy agrees with the experimental value. 

G. C. Lynch, R. Steckler, D. W. Schwenke, A. J. C. Varandas, D. G. Truhlar, and B. C. Garrett, Use of scaled external correlation, a double many-body expansion, and variational transition state theory to calibrate a potential energy surface for FH2, J. Chem. Phys. 94 7136 (1991). 

Saddle optimization, 329 Scalar relativistic corrections, 209 Scaled External Correlation (SEC), Scaled All Correlation (SAC) models, 169 Scaling of different methods with basis set, 145 Schrodinger equation, 2, 53 Schwarz inequality, for integral screening, 78 Second quantization, 411 Second-order corrections, in perturbation methods, 126... 

The sulfide vertical distribution correlates with vertical distributions of temperature, salinity, and density in the Black Sea. As a consequence, the H2S vertical distribution vs. salinity (Fig. 3a) and temperature (Fig. 3b) is consistent with the 9 -S curve (Fig. 3b). It is evidence that the thermohaline structure of the water column controls the vertical distribution of hydrogen sulfide in the basin [27]. Physical mixing processes dominate over the in situ sulfide production. Identifiable on the 0 -H2S and S-H2S diagrams, the boundaries of three water masses in the anoxic water column correspond strictly to the boundaries on the 0 -S diagram (Fig. 3b). The temperature-salinity relationship in the Black Sea is a result of large-scale external factors such as water and heat balance of the basin. 

To estimate the superficial liquid velocity in the riser, this correlation must be combined with the Fanning friction factors in the riser and downcomer, f and f, the frictional loss coefficients at the top and bottom of the airlift, and and the gas hold-up in the riser, This approach predicted their experimental data in a pilot-plant scale external-loop airlift column for a carboxymethyl cellulose solution, with an error of 20%. 

Entropic Effects on the Dynamical Bottleneck Location and Tunneling Contributions for C2hl4 -F H — C2H5. Variable Scaling of External Correlation Energy for... 

Any mass spectrometer requires mass calibration before use. However, the procedures to perform it properly and the number of calibration points needed may largely differ between different types of mass analyzers. Typically, several peaks of well-known m/z values evenly distributed over the mass range of interest are necessary. These are supplied from a well-known mass calibration compound or mass reference compound. Calibration is then performed by recording a mass spectrum of the calibration compound and subsequent correlation of experimental m/z values to the mass reference list. Usually, this conversion of the mass reference list to a calibration is accomplished by the mass spectrometer s data system. Thereby, the mass spectrum is recalibrated by interpolation of the m/z scale between the assigned calibration peaks to obtain the best match. The mass calibration obtained may then be stored in a calibration file and used for future measurements without the presence of a calibration compound. This procedure is termed external mass calibration. 

Hydrate dissociation is of key importance in gas production from natural hydrate reservoirs and in pipeline plug remediation. Hydrate dissociation is an endothermic process in which heat must be supplied externally to break the hydrogen bonds between water molecules and the van der Waals interaction forces between the guest and water molecules of the hydrate lattice to decompose the hydrate to water and gas (e.g., the methane hydrate heat of dissociation is 500 J/gm-water). The different methods that can be used to dissociate a hydrate plug (in the pipeline) or hydrate core (in oceanic or permafrost deposits) are depressurization, thermal stimulation, thermodynamic inhibitor injection, or a combination of these methods. Thermal stimulation and depressurization have been well quantified using laboratory measurements and state-of-the-art models. Chapter 7 describes the application of hydrate dissociation to gas evolution from a hydrate reservoir, while Chapter 8 describes the industrial application of hydrate dissociation. Therefore in this section, discussion is limited to a brief review of the conceptual picture, correlations, and laboratory-scale phenomena of hydrate dissociation. 

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