Screening and Treatment of Tobacco Use Disorder in Mental Health Clinics in New York State: Current Status and Potential Next Steps.

The prevalence of smoking is higher among individuals with serious mental illnesses than the general population. Evidence-based practices exist for tobacco cessation, but little is known about mental health clinics' tobacco cessation treatment practices/protocols. Mental health clinics in New York State were surveyed about their tobacco use treatment protocols and outdoor-smoking policies.

On stability and instability criteria for magnetohydrodynamics.

It is shown that for most, but not all, three-dimensional magnetohydrodynamic (MHD) equilibria the second variation of the energy is indefinite. Thus the class of such equilibria whose stability might be determined by the so-called Arnold criterion is very restricted. The converse question, namely conditions under which MHD equilibria will be unstable is considered in this paper.

Instability criteria for steady flows of a perfect fluid.

An instability criterion based on the positivity of a Lyapunov-type exponent is used to study the stability of the Euler equations governing the motion of an inviscid incompressible fluid. It is proved that any flow with exponential stretching of the fluid particles is unstable. In the case of an arbitrary axisymmetric steady integrable flow, a sufficient condition for instability is exhibited in terms of the curvature and the geodesic torsion of a stream line and the helicity of the flow.

Dynamo theory, vorticity generation, and exponential stretching.

A discussion is given of the analogy between the dynamo equation for the generation of a magnetic field by the motion of an electrically conducting fluid and the equation for the evolution of vorticity of a viscous fluid. In both cases exponential stretching is an important feature of the underlying instability problem. For the "fast" dynamo problem, the existence of exponential stretching (i.