Toroidal and Boundary-Reducing Dehn Fillings

Let M be a simple 3-manifold with a toral boundary component partial_0 M. If Dehn filling M along partial_0 M one way produces a toroidal manifold and Dehn filling M along partial_0 M another way produces a boundary-reducible manifold, then we show that the absolute value of the intersection number on partial_0 M of the two filling slopes is at most two. In the special case that the boundary-reducing filling is actually a solid torus and the intersection number between the filling slopes is two, more is said to describe the toroidal filling.Comment: 12 pp., AmSTeX, 6 figs.[uses epsf], Topology Appl. (to appear

Performance of self bit synchronizers for the detection of anticorrelated binary signals

Self bit synchronizers for detection of anticorrelated binary systems of digital communication system

Performance of self bit synchronization systems

Optimum estimator for random signal sequence derived by digital computer and evaluated by Monte Carlo metho

Design, Development, and Testing of an Automated Window Sliade Controller

An approach to the design of active window shades is developed to control the direct solar gain through a window. Using simple actuation hardware and sensors, a control strategy is presented that automatically adjusts window shades to save HVAC energy by controlling direct solar radiation passing through a window. The control algorithm is based on a simple approach that admits direct light in the winter and blocks the direct light in the summer, while providing shade adjustment that affords maximum visibility through the window. Cloudy skies or indirect sun result in horizontal placement of the shades, and the shades close at night. The implementation uses two thin-film photovoltaic cells as sensors and a control algorithm that is independent of the window orientation, latitude, or solar time, so that it operates properly in any installation location. Preliminary analytic and test results show significant energy savings when the automatic window shades are compared with a window without shades, and with a window outfitted with fixed horizontal shades

Multimedia in Requirements Elicitation: When to Show, to Speak, to Animate, or to Simulate

Requirements elicitation is considered to be the most difficult and most critical phase in software development due to the abstract information that is communicated during this process. Cross-functional team members communicate requirements to ultimately reach shared understanding of the user’s needs. Given the increasing adoption of interactive simulation tools to facilitate the requirements elicitation process, we propose a study that investigates the impact of animations and simulations in combination with verbal information presented visually and auditorily on requirements elicitation performance through the lens of two theories from the education and learning domain: dual-coding theory and multimedia learning theory

Salmonine Consumption and Competition for Endemic Prey Fishes in Bear Lake, Utah-Idaho

Two principal sport fish—the indigenous Bonneville cutthroat trout Oncorhynchus clarki utah and the introduced lake trout Salvelinus namaycush—are the dominant piscivores in Bear Lake, a 282-km^2 oligotrophic system. These piscivores rely predominantly on four endemic prey fish species that make up a major portion of the unique Bear Lake fish assemblage. We estimated the annual biomass of pelagic and benthic prey fish by using hydroacoustic and trawling techniques. We also estimated the lakewide abundance of piscivores with a multiple mark–recapture survey and used a bioenergetics model to compare the population-level consumption of prey fish with prey fish production. Prey fish biomass declined to a minimum during 1991 and 1992 but subsequently recovered to reach maximum levels during 1994 and 1995. The proportion of maximum ration estimates from model simulations indicated that the piscivores were consuming well below maximum rations during a period when predation exceeded prey fish production, thereby providing the potential for a predator–prey imbalance. Predation impacts by lake trout cohorts were prolonged because of high survivorship and long life expectancy. Although cutthroat trout outnumbered lake trout, the larger, more piscivorous size-classes of cutthroat trout accounted for only 12.5% of their population. This information, combined with overlapping diets and declining condition factors at increased piscivore biomass, also indicates that lake trout may be competing with cutthroat trout during periods of low prey fish resources. Lake trout predation on juvenile cutthroat trout, combined with competition with other age-classes, also contributes to the poor survival of cutthroat trout. Although prey fish abundance appears to be largely influenced by bottom-up factors related to water elevation, lake trout exert a decoupled predatory threat to the endemic prey fish populations and have the potential to suppress endemic fishes during unpredictable periods of poor prey fish production

The Identification of Yeasts from Clinical Material

A workable, practical scheme for the identification of yeasts isolated from clinical specimens is presented. Relationships between medically important sexual stages and imperfect forms, and characteristics of the sexual stages in clinical material, are described. Included in this report is a guide to yeast identification which relies on the Luecke plate, a modified Dalmau plate

Gas holdup and longitudinal dispersion in different types of multiphase reactors and their possible application for microbial processes

Gas holdup and liq. phase longitudinal dispersion were detd. in concurrent 1- and 6-stage, 2-phase bubble columns, and in countercurrent 1-stage, 2- and 3-phase bubble columns, using the longitudinal dispersion and backflow cell models to describe the intensity of longitudinal mixing. The axial dispersion model in conjuction with Monod growth kinetics were used to examine the influence of fluid mixing on the performance of a microbial process. [on SciFinder (R)