Cohan

Thus, as pointed out by Cohan who first suggested this model, condensation and evaporation occur at difi erent relative pressures and there is hysteresis. The value of r calculated by the standard Kelvin equation (3.20) for a given uptake, will be equal to the core radius r,. if the desorption branch of the hysteresis loop is used, but equal to twice the core radius if the adsorption branch is used. The two values of should, of course, be the same in practice this is rarely found to be so. 

The results of Cohan on the force of retraction r at a = 1.5 for GR-S synthetic rubbers vulcanized with various proportions of a calcium carbonate filler are shown in Fig. 104. The agreement with the theoretical curve drawn according to Eq. (52) is good. In further confirmation of the theory, variations in average particle diameter... 

Fig. 104.—Tension r at O = 1.5 for GR-S synthetic rubber containing various proportions of calcium carbonate (particle diameter 3900 mju), but vulcanized under otherwise identical conditions. The solid curve has been calculated according to Ed. (52) the broken curve by neglecting the third term in this equation. (Cohan. s)...

M. S. Roberts, L. K. Nakamura, and F. M. Cohan, Bacillus vallismortis sp nov, a close relative of Bacillus subtilis, isolated from soil in Death Valley, California, hit. J. Sys. Bacteriol. 46 470 (1996). 

Zhou, F. Q. and Cohan, C. S. How actin filaments and microtubules steer growth cones to their targets. /. Neurobiol. 58 84-91,2004. 

Campbell, G. L. Cohan, D. and North, D. W. "The Application of Decision Analysis to Toxic Substances Proposed Methodology and Case Studies" prepared by Decision Focus Incorporated for the Office of Toxic Substances, Environmental Protection Agency, 1982. 

Cohan assumed that condensation occurs by filling the pore from the... 

SDItXD BY JUllan Clar Cohan, Batrlcln Illlncvorth and Odo SchUklank... 

Kater, S.B., Mattson, M.P., Cohan, Ch., Connor J. Calcium regulation of the neuronal growth cone, Trends Neurosci. 1988, 11, 315-321. 

According to the classical treatment of Cohan [8], which is the basis of the conventional BJH method [14], capillary condensation in an infinite cylindrical pore is described by the Kelvin equation using cylindrical meniscus, while desorption is associated with spherical meniscus. In large pores the following asymptotic equation is expected to be valid [8] Pd/Po = (PA/P0)2, where Pd/Po and Pa/Po are the relative pressures of the desorption and adsorption, respectively. An improved treatment [9-11, 13], originated from Deijaguin [9], takes into... 

Figure 2. Capillary hysteresis of nitrogen in cylindrical pores at 77 K. Equilibrium desorption (black squares) and spinodal condensation (open squares) pressures predicted by the NLDFT in comparison with the results of Cohan s equation (the BJH method) for spherical (crosses and line) and cylindrical (line) meniscus.

S. Pang, S. Taneja, K. Dardashti, P. Cohan, R. Kaboo, M. Sokoloff, C. L. Tso, J. B. Dekernion, and A. S. Belldegrun, Prostate tissue specificity of the prostate-specific antigen promoter isolated from a patient with prostate cancer, Hum. Gene Ther. 6 1417 (1995). 

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