financial scientists have always been eager to distinguish between whether the price series could be random walk (unit root) or mean reverting processes.by a random walk we mean that accruing shocks to the system have permanent impacts and prices do not revert to their previous trend path, in addition, regarding to random walk processes the price series volatility could increase with out any li...

P ERIODIC REPORTS HAVE EMPHASIZED the lack of stability of repeated tuberCulin skin tests in children. Kunofsky and Katz1 reported on two large groups in two schools for mental defectives. Reversion rates of 4 to 19 per cent were found. Marks et al.2 reported reversion rates between 12 and 26 per cent, depending on Criteria used, during a one-year period of observation of 1,100 tuberculin posit...

We study families of generalized Catalan numbers, defined by convolution recurrence equations. We explore their relations to series reversion, Riordan array transforms, and in a special case, to Somos-4 sequences via the mechanism of the Hankel transform.

Formation of nano/ultrafine grain structure in AISI 304L austenitic stainless steel through the martensite reversion treatment was studied. The solution annealed specimens were cold rolled up to 95 % thickness reduction at -15°C. The cold-rolled specimens were subjected to reversion annealing treatment at the temperature range of 700-1000 °C for 10–150 min. Microstructural evolutions were analy...