HORVATH

Method of Horvath The atom contribution method of Horvath has been reported to estimate V 5 for halogenated hydrocarbons and ethers in the range Ci to C4 [28, p. 314]  

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This equation describes the additional amount of gas adsorbed into the pores due to capillary action. In this case, V is the molar volume of the gas, y its surface tension, R the gas constant, T absolute temperature and r the Kelvin radius. The distribution in the sizes of micropores may be detenninated using the Horvath-Kawazoe method [19]. If the sample has both micropores and mesopores, then the J-plot calculation may be used [20]. The J-plot is obtained by plotting the volume adsorbed against the statistical thickness of adsorbate. This thickness is derived from the surface area of a non-porous sample, and the volume of the liquified gas. 

Horvath G and Kawazoe K 1983 Method for oaloulation of effeotive pore size distribution in moleoular sieve oarbon J. Chem. Eng. Japan 16 470-5... 

Hunger M and Horvath T 1995 A new MAS NMR probe for in situ investigations of hydrooarbon oonversions on solid oatalysts under oontinuous-flow oonditions Chem. Commun. 1995 1423-4... 

Protonation of formic acid similarly leads, after the formation at low temperature of the parent carboxonium ion, to the formyl cation. The persistent formyl cation was observed by high-pressure NMR only recently (Horvath and Gladysz). An equilibrium with diprotonated carbon monoxide causing rapid exchange can be involved, which also explains the observed high reactivity of carbon monoxide in supera-cidic media. Not only aromatic but also saturated hydrocarbons (such as isoalkanes and adamantanes) can be readily formylated. 

To gain a proper perspective of the role of computed physical properties, the relationship between estimated and computed properties needs to be understood. A thorough reading of Horvath (25) permits formulation of the following definitions of estimating or computing properties. 

A. L. Horvath, Molecular Design, Vol. 75, Elsevier, Amsterdam/New York, 1992. 

S. M. Horvath and co-workers. Effects of Sulfuric Acid Mist Exposure on Pulmonary Function, EPA-600/S1-81-044, issued as PB81-208977 by NTIS, Washington, D.C., June 1981. 

A. L. Horvath, HalogenatedHydrocarbons Solubility-Miscibility With Water, Marcel Dekker, Inc., New York, 1982, pp. 494, 550. 

C. Horvath and J. AnalyticalPiotechnolog Capillay Electrophoresis and Chromatography, ACS Books, Washington, D.C., 1990. 

R. E. Horvath, Pioneer Plants Study User s Manual, Rept. R-2569/1-DOE, Rand Corp., SantaMonica, Calif., June 1983. 

J. W. Horvath, "Bound Antioxidant Stabilized NBRin Automotive Annua/hAeetingProceedings of thellSRP, Paper No. 11, 1979, p. 20. 

Correlations for axial dispersion in beds packed with very small particles (<50 Im) that take into account the holdup of liquid in a bed are discussed by Horvath and Lin [J. Chromatogr, 126, 401 (1976)]. 

References A. Snyder in Horvath (ed.), High Feifonnance Liquid Chromatography Advances and Ferspectives, vol. 1, Academic Press, 1980, p. 208. B. Yamamoto, Biotechnol. Bioeng., 48, 444 (1995). 

TABLE 16-15 Concentrations and h-Function Roots for Displacement Chromatography of a Mixture of M-1 Components Numbered in Order of Decreasing Affinity for the Stationary Phase (Adapted from Frenz and Horvath/ 1985). 

In (1976) Horvath and Lin [8,9] introduced yet another equation to describe the value of(H) as a function of the linear mobile phase velocity (u). Again, it would appear... 

Horvath and Lin s equation is very similar to that of Huber and Hulsman, only differing in the magnitude of the power function of (u) in their (A) and (D) terms. These workers were also trying to address the problem of a zero (A) term at zero velocity and the fact that some form of turbulence between particles aided in the solute transfer across the voids between the particles. 

Examination of the data given in Table 2 shows a rational fit of the experimental data to the equations of Van Deemter, Giddings and Knox. Both the Huber and Horvath equations, however, gave alternating positive and negative values for the constant (D)... 

An alternative expression for resolution was put foreword by Karger, Snyder and Horvath (1), viz. 

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