Phase behaviour of attractive and repulsive ramp fluids: integral equation and computer simulation studies

Using computer simulations and a thermodynamically self consistent integral equation we investigate the phase behaviour and thermodynamic anomalies of a fluid composed of spherical particles interacting via a two-scale ramp potential (a hard core plus a repulsive and an attractive ramp) and the corresponding purely repulsive model. Both simulation and integral equation results predict a liquid-liquid de-mixing when attractive forces are present, in addition to a gas-liquid transition. Furthermore, a fluid-solid transition emerges in the neighbourhood of the liquid-liquid transition region, leading to a phase diagram with a somewhat complicated topology. This solidification at moderate densities is also present in the repulsive ramp fluid, thus preventing fluid-fluid separation.Comment: 29 pages, 10 figure

Duties of Members, Directors, and Managers of Cooperative Associations

Exact date of bulletin unknown.PDF pages: 1

Religious Belief and Culture: The Curious Case of the Intuitive Soul

While Adventists recognize some of the straightforward and concrete ideas that are part of doctrinal training on human nature and the state of the dead, the core intuitive belief in mind-body dualism likely continues to influence how Adventists understand human nature

Dynamic conversion of solar generated heat to electricity

The effort undertaken during this program led to the selection of the water-superheated steam (850 psig/900 F) crescent central receiver as the preferred concept from among 11 candidate systems across the technological spectrum of the dynamic conversion of solar generated heat to electricity. The solar power plant designs were investigated in the range of plant capacities from 100 to 1000 Mw(e). The investigations considered the impacts of plant size, collector design, feed-water temperature ratio, heat rejection equipment, ground cover, and location on solar power technical and economic feasibility. For the distributed receiver systems, the optimization studies showed that plant capacities less than 100 Mw(e) may be best. Although the size of central receiver concepts was not parametrically investigated, all indications are that the optimal plant capacity for central receiver systems will be in the range from 50 to 200 Mw(e). Solar thermal power plant site selection criteria and methodology were also established and used to evaluate potentially suitable sites. The result of this effort was to identify a site south of Inyokern, California, as typically suitable for a solar thermal power plant. The criteria used in the selection process included insolation and climatological characteristics, topography, and seismic history as well as water availability

Surface-Displacement Imaging Using Optical Beam Deflection

Important information on subsurface material parameters and structure is contained in the dynamics of surface motion. One of the most important techniques in quantitative nondestructive evaluation is optical sensing of surface displacement; it is noncontact, sensitive, fast, and capable of high spatial resolution. Laser interferometers in various configurations provide the ultimate in sensitivity [1]; however, due to their complexity and lack of flexibility, they may not be the first choice in applications where ultimate sensitivity is not required