The paper addresses the stability analysis of linear continuous systems under interval uncertainties. A new implementation of the interval Frazer-Duncan criterion is suggested to estimate the stability of the system considered. It is based on obtaining the interval extensions of the coefficients 0 a and n a in the characteristic polynomial as well as the determinant 1 − ∆ n from the Hurwitz mat...

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Enterotoxin-positive (Ent+) and enterotoxin-negative (Ent-) strains of Clostridium perfringens were cultured in Duncan-Strong sporulation medium containing starch at 37 and 46 degrees C. At 37 degrees C, all strains degraded starch and sporulated well. However, only Ent- strains could hydrolyze starch, grow extensively, and sporulate at 46 degrees C. Growth, sporulation, and starch hydrolysis b...

DUNCAN (1959) described a method for determining halothane in tissues, body fluids and gases, based on the liberation of chloride and bromide ions by the action of an ethereal solution of lithium aluminium hydride. The reagent is somewhat troublesome to prepare and can only be kept under conditions which rigidly exclude moisture. Some workers have experienced difficulties in obtaining anhydrous...

School of Management, Northwestern University (e-mail: eric-anderson@ northwestern.edu). Nathan M. Fong is a doctoral student (e-mail: nfong@ sloan.mit.edu), Duncan I. Simester is NTU Professor of Management Science (e-mail: [email protected]), and Catherine E. Tucker is Douglas Drane Career Development Professor in IT and Management and Assistant Professor of Marketing (e-mail: [email protected]...

In recent years, games and learning researchers have increasingly become interested in the "affinity spaces" (Gee, 2004) around popular videogames, identifying them as instructional spaces (Squire and Giovanetto, 2008) and contexts in which sophisticated reasoning practices are enacted (Steinkuehler and Duncan, 2008). However, the motivation for participation in these communities as well as the...