When a classical oscillator is interacting with a purely quantum mechanical oscillator, described by the Lagrangian L = 1/2 x{sup 2} + 1/2A{sup 2} - 1/2 (m{sup 2} + e{sup 2} A{sup 2})x{sup 2}, where A is a classical variable and x is a quantum operator the relevant degrees of freedom for the quantum oscillator when {l_angle}x(t)x(t){r_angle} = G(t). The classical Hamiltonian dynamics governing the variables A(t). {Pi}{sub A}(t). G(t) and {Pi}{sub G}(t) is chaotic so that the results of making measurements on the quantum system at later times are sensitive to initial conditions. We review this system and discuss how this behavior is altered when the quantum fluctuations of the A oscillator are determined exactly and in a 1/N expansion where N is the number of copies of the x oscillator.

Although Lawrence Livermore National Laboratory has been involved in weapons disassembly since its involvement in weapons design, the Lab was recently requested by the Department of Energy to extend its responsibility for LLNL-designed weapons to include dismantlement of some systems in the cold war arsenal. Dissolution of LX-10-1 and PBX-9404 explosive from two artillery fired atomic projectiles (AFAPs) can be accomplished using dimethyl sulfoxide. The composition of LX-10-1 and PBX-9404 are given. The authors have evaluated the detonability of solutions of these two plastic bonded explosives in dimethyl sulfoxide (DMSO) under shock and thermal scenarios based on the UN ``Recommendations on the Transport of Dangerous Goods - Tests and Criteria`` (ST/SG/AC.10/11) and US Army Technical Bulletin 700-2. Prior to the relatively large scale shock and thermal sensitivity testing, small scale safety tests and thermochemical code calculations were used as a preliminary estimate of the detonability and hazards associated with up to 33% of these explosives in DMSO. Thermochemical calculations, small scale safety testing, and gap testing all indicate that these solutions are not detonable. They are currently in the process of evaluating these solutions using the small scale cookoff bomb (SCB) test.

A simple and accurate technique has been developed for measuring dynamic surface tension. The new technique is based on growing a drop at the end of a fine capillary into another immiscible fluid and can follow the changes in tension at a freshly formed interface during its entire period of evolution. When the relative importance of the surface tension force is large compared to gravitational and viscous forces, shapes of growing drops are sections of spheres and the difference in pressure between the interior and the exterior of the drop {triangle}p is related to the surface tension {sigma} and the radius of curvature R by the static Young-Laplace formula {triangle}p = 2{sigma}/R. In contrast to related work, the new technique can determine the surface tension of an interface with a surface age of a few to tens of milliseconds by measuring transient drop shapes and pressures in 1/6 to 1 millisecond. The capabilities of the new method are demonstrated by performing tension measurements on liquid systems that do not exhibit dynamic surface tension as well as ones that exhibit significant dynamic tension effects. Tension measurements made with surfactant-laden solutions show that variation of surface tension is nonmonotonic in time. In …

The northern goshawk was listed in January 1992 as a candidate species (Category 2) for possible future listing under the Endangered Species Act (ESA) throughout its range in the United States. Category 2 species are those for which there are not adequate data to justify a listing proposal under ESA at that time.