HBT shape analysis with q-cumulants

Taking up and extending earlier suggestions, we show how two- and threedimensional shapes of second-order HBT correlations can be described in a multivariate Edgeworth expansion around gaussian ellipsoids, with expansion coefficients, identified as the cumulants of pair momentum difference q, acting as shape parameters. Off-diagonal terms dominate both the character and magnitude of shapes. Cumulants can be measured directly and so the shape analysis has no need for fitting.Comment: 8 pages, 6 figures for a total of 29 subfigs, revtex4. Typos corrected, three missing terms added, minor text change

Assessment: Insights into Children\u27s Beliefs and Perceptions About Process Writing

How do children acquire knowledge about written language? Investigations of emergent literacy have shown that children\u27s written language knowledge reflects their cultural environment (Clay, 1982; Kastler, Roser, and Hoffman, 1987). At home, children observe their parents writing grocery lists, letters to friends and relatives, and telephone messages, thereby learning the functions of written language as they are used in daily life (Morgan, 1987; Purcell-Gates, 1986). Independently, children experiment with their own messages, incorporating scribble, pictures and random letters. Often their written products mirror the functional writing their parents modeled (Rowe, 1989). In school, additional opportunities to learn about written language are presented. Some tasks are inherent to the school setting, such as reports and labels, while others resemble those practices at home (Dyson, 1984). Children in classrooms where traditional writing instruction prevails find constraints placed upon their writing by their teacher, such as topic, length and purpose

Analytical solution for multivariate statistics in random multiplicative cascades

It has long been a puzzle how to solve random multiplicative cascade structures analytically. We present an analytical solution found recently in the form of a simple pedagogical example of the general case.Comment: Workshop on Correlations and Fluctuations, Matrahaza, June 98, uses sprocl.sty, 8 pages, 8 figs, 3 typos correcte