RESUMO
Nulling interferometry aims to perform destructive interference achromatically. It is used to detect a faint source near a bright one and to provide dark field, an annular pupil, and rotational shear. A nulling out-of-plane interferometer that utilizes the geometric phase of spin redirection is proposed. The degree of nulling is determined by beam collimation and angular orientation of mirrors. Simulations and experiments are in reasonable agreement.
RESUMO
An analysis of the current roles of the federally funded community mental health center and the public mental hospital suggests that despite the rhetoric about a community mental health revolution, the mental field has yet to undergo significant change. Ideological, political, economic, and structural barriers-characteristics of the field itself-impede such change outside, inside, and across the centers and hospitals. Recent court decisions on patients' rights, however, have the potential for moving the field into a period where "bold new action" actually can occur.
