This paper is concerned with the study of low-cost, low-power thermoacoustic electricity generators. Based on target electrical output power values of 50 and 100 W, three standing wave prototypes (of both one-stage and two-stage prototypes) integrating a commercial loudspeaker with different coupling arrangements are conceived. Each stage consists of a square-pore stack sandwiched between hot a...

In a variety of group settings, members favor men over women when selecting and evaluating leaders, even when actual leadership behaviors are held constant. Leadership categorization theory (R. B. Lord & K. J. Maher, 1991) and social role theory (A. H. Eagly, 1987) suggest that these biases result from discrepancies between individuals' stereotypes about women and their implicit prototypes of l...

This research aims at discovering the traits and abilities which characterize ideal leaders in the minds of employees in an Iranian context. After employing the strategy of phenomenology to reach the components of ideal leadership, 15 tenured middle managers and employees possessing decent management knowledge in the context were interviewed and after theme analysis, global, basic, and organizi...

If M is the complement of a hyperplane arrangement, and A = H(M, k) is the cohomology ring of M over a field of characteristic 0, then the ranks, φk, of the lower central series quotients of π1(M) can be computed from the Betti numbers, bii = dimTor A i (k, k)i, of the linear strand in a minimal free resolution of k over A. We use the Cartan-Eilenberg change of rings spectral sequence to relate...

We study an elementary problem of the topological robotics: collective motion of a set of n distinct particles which one has to move from an initial configuration to a final configuration, with the requirement that no collisions occur in the process of motion. The ultimate goal is to construct an algorithm which will perform this task once the initial and the final configurations are given. Thi...

A pseudocircle is a simple closed curve on the sphere or in the plane. The study of arrangements of pseudocircles was initiated by Grünbaum, who defined them as collections of simple closed curves that pairwise intersect in exactly two crossings. Grünbaum conjectured that the number of triangular cells p3 in digon-free arrangements of n pairwise intersecting pseudocircles is at least 2n−4. We p...

Non-Whites’ stereotypes of White women were examined, comparing three perspectives: (1) White women are perceived similarly to ethnically “generic” stereotypes of women; (2) stereotypes are opposite of stereotypes of participants’ own ethnic group; and (3) stereotypes are derived from media images of White women. In Study 1, participants listed stereotypes of White women in an open-ended fashio...